Canadian Patents Database / Patent 1319739 Summary
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|(12) Patent:||(11) CA 1319739|
|(21) Application Number:||612271|
|(54) English Title:||ELECTRICAL CONNECTOR SYSTEM|
|(54) French Title:||CONNECTEUR ELECTRIQUE|
- Bibliographic Data
- Representative Drawing
- Admin Status
- Owners on Record
|(52) Canadian Patent Classification (CPC):||
|(51) International Patent Classification (IPC):||
|(72) Inventors :||
|(73) Owners :||
|(71) Applicants :|
|(74) Agent:||SMART & BIGGAR|
|(74) Associate agent:|
|(22) Filed Date:||1989-09-21|
|(30) Availability of licence:||N/A|
|(30) Language of filing:||English|
|(30) Application Priority Data:|
A high density, high frequency electrical connector
system having ground contacts disposed between adjacent
columns of signal carrying contacts to provide signal
integrity. More particularly, the system includes two
mating connectors with the ground contacts in one being
blades and the ground contacts in the other being plates
with blade engaging cantilever beams thereon so that when
the two connectors are mated, the ground contacts complete
a ground circuit and the plates provide a shield between
adjacent columns of mated signal carrying contacts.
The embodiments of the invention for which an exclusive
property or privilege is claimed are as follows:
1. An electrical connector system for use in
electrically connecting circuits on a backplane and on a
circuit card, said system comprising:
a first connector having columns of conductive signal
contacts disposed in passages in a dielectric housing,
said signal contacts having leads at one end extending
outwardly from one surface of the housing for electrically
engaging signal circuits on the backplane on which said
first connector may be mounted and pins at another end
extending into a cavity opening outwardly on another
surface of said housing, and further having conductive
other contacts disposed in other passages in said housing,
said other contacts having leads at one end extending
outwardly from said one surface for engaging other
circuits on the backplane and blades at another end
located between adjacent columns of said pins in said
a second connector having columns of conductive
signal contacts disposed in passages in a dielectric
housing, said signal contacts having leads at one end
extending outwardly from one surface of the housing for
electrically engaging signal circuits on the circuit card
which may be attached to said second connector and
receptacles at another end which are accessible through
openings in another surface of said housing and further
having conductive other contacts disposed in slots in said
housing with said slots being between adjacent columns of
said signal contacts, said other contacts having leads
extending outwardly from said one surface for electrically
engaging other circuits on the circuit card and plates at
another end, said plates carrying blade engaging means
thereon which are accessible through slot openings on said
another surface, said second connector adapted for being
received in said cavity in said first connector with said
pins and said receptacles being electrically engaged and
said blade and said blade engaging means being
2. The connector system of claim 1 wherein said
other contacts in said first and second connectors provide
a ground reference.
3. The connector system of claim 1 wherein some of
said other contacts in said first and second connector
provide a ground reference and others of said other
contacts carry power.
4. The connector system of claim 1 wherein said
blades on said other contacts are attached to and extend
from strap means.
5. The connector system of claim 4 wherein there
are a pair of blades between adjacent columns of pins and
a pair of plates between adjacent columns of receptacles.
6. The connector system of claim 5 wherein said
strap means attached to said pair of blades are severably
7. The connector system of claim 5 wherein said
pair of plates are severably joined.
8. The connector system of claim 5 wherein said
strap means attached to said pair of blades are severably
joined and said pair of plates are severably joined.
9. The connector system of claim 1 wherein said
blade engaging means on said plates include a cantilever
10. An improvement to an electrical connector system
of the type having intermatable first and second
connectors with both connectors having column and row
configurations of electrically engaging signal contacts,
said improvement comprising intermatable ground contacts
wherein said ground contacts in said first connector
include outwardly projecting blade means located between
adjacent columns of signal contacts and said ground
contacts in said second connector include a cantilever
beam attached to plate means located between adjacent
columns of said signal contacts in said second connector,
each said beam adapted to slidingly engage said blade
means and said plate means adapted to provide shielding
between adjacent columns of mated signal contacts.
11. The improvement of claim 10 wherein there are a
pair of blade means between adjacent columns of signal
contacts in the first connector and a pair of plate means
between adjacent columns of signal contacts in the second
12. The improvement of claim 11 wherein said blade
means are attached to and extend from strap means.
13. The improvement of claim 12 wherein said strap
means on said pair of blade means are separably joined.
14. The improvement of claim 11 wherein said pair of
plate means are separably joined.
15. The improvement of claim 10 wherein said plate
means include an ear on an edge thereof, said ear
extending between adjacent signal contacts in an adjacent
column of signal contacts.
16. An electrical connector system for use with
parallel substrates, said system comprising:
a first connector for being mounted on one substrate
and having an outwardly open cavity in one surface, an
opposing surface, and passages extending between said
a plurality of first contacts disposed in some of
said passages which are arranged in columns extending
across the width of said connector, said first contacts
having posts extending into said cavity;
a plurality of second contacts disposed in other of
said passages and having blades thereon extending into
said cavity between adjacent columns of posts;
said first and second contacts further having leads
extending outwardly from said opposing surface for
electrically engaging circuits on the one substrate of the
connector may be mounted:
a second connector having a front surface, a rear
surface, a plurality of passages arranged in columns
extending across the width of said connector and a
plurality of slots located between adjacent columns of
passages, said passages and slots passing between said
front and rear surfaces;
a plurality of third contacts disposed in said
passages and having receptacles positioned to electrically
interconnect with respective ones of said posts of said
first contacts when said first and second connectors are
a plurality of fourth contacts disposed in said slots
and having plate means for shielding said first and third
contacts and for electrically engaging said blades when
said first and second connectors are mated; and
leads on said third and fourth contacts extending
outwardly from said rear surface for electrically engaging
circuits on another substrate which may be mounted on said
second connector parallel to said one substrate.
17. The connector system of claim 16 wherein said
first and third contacts transmit signals and said second
and fourth contacts provide a ground reference.
18. The connector system of claim 16, wherein said
first and third contacts transmit signals, some of said
second and fourth contacts provide a ground reference and
other of said second and fourth contacts transmit power.
~ 3~ 3~
~LECTRICAL CONNECTOR SYSTEM
The invention dis~l~sed herein relates to signal
integrity in high density, high frequency connector
systems of the type used to electrically interconneck high
frequency signal circuits on backplanes, daughter cards
and other like substrates.
In the high speed technology of modern electronics,
high frequency connectors have been developed Por use with
backplanes and printed circuit cards; e.g., daughter
cards. Such connectors require shielding or ground planes
between signal pins; e.g., a stripline configuration, to
provide high frequency signal integrity and minimize
interference from foreign sources. One such arrangement
is disclosed in U.S. Patent 4,632,476 wherein a terminal
grounding unit comprises an insulating member having a row
and column configuration of apertures for receiving pin
terminals attached to and extending outwardly from a
backplane on which the insulating member is mounted.
Further, channels are provided in the insulating member
between calumns of apertures for receiving a shielding
member which is terminated to U-shaped female contacts
attached to the backplane and extending into the channels
through slots in the channel floors. This arrangement
provides a shield or ground plane between adjacent columns
of pin terminals carrying high frequency signals.
~2~ 3 ~
U.SO Patent 4,571,014 discloses a high frequency
modular connector for use with a circuit board to
interconnect the circuit board with a backplane. The
connector comprises modules each having a pair of
rectangular-shaped, circuit board members. The members
are formed with several parallel fingers separated by
slots and contain a passage in which a female contact is
disposed. Each member in each module is bracketed with a
shield member and dielectric spacer. A conductive shield
member of a different configuration is positioned between
adjacent modules. While the shield members shield
adjacent modules, a corrugated conductive member is
positioned in the slots between the fingers to shield
adjacent ~emale contact disposed in the passages in the
several fingers. The shield members and corrugated member
are connected to ground circuits to complete the ground
It is now proposed to provide ground reference
contacts in high density, high frequency two-piece
connector~ wherein the ground reference contacts provide
shielding between adjacent columns of signal carrying
contacts. It is further proposed to provide
power-carrying conta~ts in conjunction with ground
reference contacts where required.
According to the invention, a two piece, high density
electrical connector system is provided with ground
contacts between columns of signal contacts with the ground
contacts of one connector having outwardly projecting blades and
the mating ground contacts of the other connector including plates
with cantilever beams, the plates providing a shield between
columns of mated signal contac-ts and the cantilever beams
electrically engaging the blades to complete ground circuits
between backplanes and circuit cards associated with the two
Therefore, in accordance with one broad aspect oE the
present invention, there is provided an electrical connector
system for use in electrically connecting circuits on a backplane
and on a circuit card, said system comprising: a fi:rst connector
having columns of conductive signal contacts disposed in passages
in a dielectric housing, said signal contacts having ].eads at one
end extending outwardly ~rom one surface of the housing for
electrically engaging signal circuits on the backplane on which
said first connector may be mounted and pins at another end
extending into a cavity opening outwardly on another surface of
said housing, and further having conductive other contacts
disposed in other passages in said housing, said other contacts
having leads at one end extending outwardly from said one surface
for engaging other circui-ts on the backplane and blades at another
end located between adjacent columns of said pins in said cavity;
and a second connector having columns of conductive signal
contacts disposed in passages in a dielectric housing, said signal
contacts having leads at one end extending outwardly from one
surface of the housing -for electrically engaging signal circuits
on the circuit card which may be attached to said second connector
and receptacles at another end which are accessible through
openings in another surface of said housing and further having
conductive other contacts disposed in slots in said housing with
said slots being between adjacent columns of said signal contacts,
said other contacts having leads extending outwardly from said one
surface Eor electrically engaging other circuits on the circuit
card and plates at another end, said plates carrying blade
engaging means thereon which are accessible through slot openings
on said another surface, said second connector adapted for being
received in said cavity in said first connector with said pins and
said receptacles being electrically engaged and said blade and
said blade engaginy means being electrically engaged.
According to another broad aspect, the present invention
provides an improvement to an electrical connector system of the
type having intermatable first and second connectors with both
connectors having column and row configurations of electrically
engaging signal contacts, said improvement comprising intermatable
ground contacts wherein said ground contacts in said first
connector include outwardly projecting blade means located between
adjacent columns of signal contacts and said ground contacts in
said second connector include a cantilever beam attached to plate
means loca-ted between adjacent columns of said signal contacts in
said second connector, ea.ch said beam adapted to slidingly engage
said blade means and said plate means adapted to provide shielding
between adjacent columns of mated signal contacts.
According to a further broad aspect of the invention,
there is provided an electrical connector system for use with
parallel substrates, said system comprising: a first connector
~. ` ' ' ' .
, . .
for being mounted on one substrate and having an outwardly open
cavity in one surface, an opposing surface, and passages extending
between said surfaces; a plurality of first contacts disposed in
some of said passages which are arranged in columns extending
across the width of said connector, said first contacts having
posts extending into said cavity; a plurality of second contacts
disposed in other of said passages and having blades thereon
extending into said cavity between adjacen-t columns of posts; said
first and second contacts further having leads extending outwardly
Erom said opposiny surface for electrically engaging circuits on
the one substrate of the connector may be mounted; a second
connector having a front surface, a rear surface, a plurality of
passages arranged in columns extending across the width of said
connector and a plurality of slots located between adjacent
columns of passages, said passages and slots passing between said
front and rear surfaces; a plurality of third contacts disposed in
said passages and having receptacles positioned to electrically
interconnect wi-th respective ones of said posts of said first
contacts when said first and second connectors are mated; a
plurality of fourth contacts disposed in said slots and having
plate means -for shielding said first and third contacts and for
electrically engaging said blades when said first and second
connectors are mated; and leads on said third and fourth contacts
extending outwardly from said rear surface for electrically
engaging circuits on another substrate which may be mounted on
said second connector parallel to said one substrate~
The invention will now be described in greater detail
with reference to the drawings in which:
:, ' ~ ' ' .
FIGURE 1 is a perspective view of the electrical
connector system constructed in accordance with the present
FIGURES 2A 2D are various views of the housing of the
first connector of the system;
FIGURES 3A-3C are perspective views illustrating the
conductive contacts of the first connector;
FIGURES 4A, 4B are views showing the first connector;
FIGURES 5A-5D are various views of the housing of the
second connector of the system;
FIGURES 6A-6C are perspective views of the conductive
contacts of the second connector;
FIGURES 7A, 7B are cross-sectional views o:E the second
FIGURES 8A, 8B are cross-sectional views o:E the mated
first and second connectors;
" ~ ' ' '
FIGURES 9A 9D are various views showing another
embodiment of the first connector;
FIGURES lOA-lOC are various views showing yet another
embodiment of the first connector;
FIGURES llA,llB are views showing another embodiment
of conductive contacks for use in the second connector;
FIGURES 12A,12B are perspective views of yet another
embodiment of conductive contacts for use in the second
FIGURES 13A,13B are plane views showing other
embodiments of signal contacts for use in the second
FIGURE 14 is a cross-sectional view of another
embodiment of the second connector mated with a first
FIGURE 15 is a perspective view of still another
modification of a conductive contact;
FIGURE 16 is a perspective, exploded view o~ the
electrical connector system constructed in accordance with
the preferred embodiment of the present invention;
FIGURES 17 and 18 are cross-section~l views of
contact receiving cavities in the receptacle connector
taken along lines 17-17 and 18-18 of Figure 16;
FIGURE 19 is a perspective view of ground contacts;
FI~URE 20 is a perspective view of a signal
; 14351A CA
~1 3 ~
FIGURE 21 is the cross-sectional view of Figure 17
showing the ground contacts positioned in the appropriate
cavities in the receptacle connector;
FIGURE 22 is the cross-sectional view of Figure 18
showing the signal receptacle contacts po~itioned in the
appropriate cavitie~ in the receptacle connector
FIGURE 23 is a cross-sectional view of the mated
header and receptacle connectors showing the engaged
signal contacts of both connectors; and
F~GU~E 24 is a cross-sectional view of the mated
header and receptacle connectors showing the engaged
ground contacts of both connectors.
The electrical connector system of the present
invention includes a first connector known in the art as a
"pin header" and which is normally mounted on a mother
board or backplane. The system further includes a second
connector, known as a "receptacle", which plugs into or
mates with the pin header and on which is mounted a
printed circuit board commonly referred to as a "daughter
card". The connectors have conductive contacts which
carry signals between circuits on the card and backpIane.
The electrical connector system disclosed herein is
based on the high density interconnect system made and
sold by AMP Incorporated of Harrisburg, PA. The two-piece
connectors have two or more columns of signal contacts and
are sold under the product identifier of "HDI".
Electrical connector system 10 shown in Figure 1
includes ~irst connector 12, mounted on backplane 16 and
second connector 14 with its daughter card 18 adjacent
Connector 12 includPs dielectric housing 20 having
base 22 and sidewalls 24,26. End walls are not shown but
can be added. Further included are power contacts 28,
ground contacts 30 and signal contacts 32.
Figures 2A,2B,2C and 2D illustrate the structure of
housing 20 in more detail. Sidewalls 24,26 define, in
conjunction with floor 34, cavity 36. A column 38 and row
40 configuration of passages 42,44 and 46 are provided in
housing 20 which extend through base 22, opening onto
floor 34 and lower surface 48. Passages 42 are adjacent
sidewall 24, passages 44 are adjacent sidewall 26 and
passages 46 are positioned therebetween. As shown, each
column 38 includes one passage 42, one passage 44 and four
passages 46. The interior details of passages 42,44 and
46 are not shown as such depend upon the type of retention
means used to retain contacts 28,30 and 32 therein, and as
these matters are well known to those skilled in the art,
such details are not required in order to practice the
Associated with passageR 42,44 are channels 42a and
44a respectively which curve inwardly between adjacent
columns 38 and extend towards the center of cavity 36. As
shown in Figure 2D, channels 42a, 441 extend in~o but do
not go through base 22.
Housing 20 is pre~erably molded, using a plastics
material such as a high temp rature thermoplastic.
Contacts 28,30 and 32, shown in Figures 3A,3B and 3C,
include in common, compliant section 50 and lead 52.
Power and ground contacts 28,30 respectively include
retaining section 54, L-shaped straps 56 and blades 58.
As shown, straps 56 on respective contacts 28,30 curves in
opposite directions relative to each other and serve to
offset blades 58 relative to compliant section 50, leads
52 and retaining sections 54. slade 58 on ground contact
28 is longer than blade 58 on power contact 30, a common
practice in the art.
Signal contact 32 further includes retaining section
60 and pin 62.
Contacts 28,30,32 are preferably stamped and formed
with the preferred material being phosphor bronze.
Figures 4A and 4B illustrate the positioning of
contacts 28,30 and 32 in housing 20 to ~orm first
Power contacts 28 are positioned in passages 44
adjacent sidewall 26 with straps 56 thereon being received
in channels 44a.
Ground contacts 30 are positioned in passages 42
adjacent sidewall 24 with straps 56 being received in
Signal contacts 32 are positioned in passages 46 with
pins 62 projecting into cavity 36.
Compliant sections 50 and leads 52 of all contacts
28,30,32 extend outwardly from housing lower surface 48
with section 50 being adapted for a frictional fit into
plated through holes 16a,16b,16c in backplane 16 and leads
52, which project beyond backplane 16, being adapted for
wire wrapping purposes.
Second connector 14 includes dielectric housing 70,
power contacts 72, ground contacts 74 and signal contacts
76. Flgures 5A-5D illustrate the structure of housing 70
Housing 70 is a rectangular block 78 with opposing
sides 80,82, ends 84, front surface 86 and a rear face 88.
As seen in Figures 5C,5D, side 80 extends rearwardly from
front urfac~ 86 a shorter distance relative to opposing
~ide 82 and includes ledge 89.
A colu~n 90 and row 92 (Figure 5B) configuration of
passages 94, provided in housing 70, open on front surface
86 and rearwardly. Further, a column 96 and row 98
(Figure 5B) configuration of slots 100, provided in
housing 70, open on front surface 86 and also rearwardly.
The columns of four passages 94 alternate with columns of
two slots 100 along the length of housing 70.
Each passage 94 is isolated from other passages 94 by
interior walls 102 and from slots 100 by transverse walls
104. As seen in Figure 5C, beam spreaders 106 project
into respective passages 94 from each transverse wall 104.
Openings 108 of passages 94 are preferably funnel-shaped.
The free ends 110 of walls 102 are beveled on one side as
shown with the beveled extending rearwardly and towards
Slots 100 in each row 96 are separated by wall 112.
Further, noses 114 project into respective slots 100 from
inside surfaces 116 of respective sides 80,82 and
rearwardly facing ledge 117 is provided on the inside
surface 116 of side 82.
Housing 70 is preferably molded with the preferred
material being a high temperature thermoplastic.
Contacts 72,74 and 76 which are associated with
second connector 14 are shown in Figures 6A,6B and 6C
respectively. These contacts are preferably stamped and
formed from beryllium copper.
Power contact 72 (Figures 6A) includes flat plate 118
with the front end of front portion 120 slotted to provide
cantilever beam 124 and fingers 126,128 on respective
sides thereof. Beam 124 includes convex contact surface
130 at the free end thereof and further is bent out in one
direction from the plane of plate 118 adjacent the point
of attachment thereto. It is thPn bent in the opposite
direction so that the beam crosses the plane of plate 118,
placing convex contact surface 30 on the other side of
plate 118. Notches 132 and 134 are provided in outwardly
facing side edge 136 of plate 118 with the former being
near the free end of finger 128. Tab 138 projects
outwardly from edge 136 at the junction between front and
rear portions 120,122 respectively.
Rear portion 122 is in the same plane as but is
formed at an angle relative to front portion 1~0 with the
angle being about forty five degrees. Projecting
outwardly from a corner of rear portion 122 is lead 140
which is bent out of the plane of plate 118 so as to be at
right angles thereto and accordingly offset therefrom.
Ground contact 74 (Figure 6B) includes flat plate 142
wherein the forward free end 144 is slotted to define
cantilever beam 146 bracketed by fingers 148,150 on
respective sides. Beam 146 includes a convex contact
sur~ace 152 at the free end thereof, and as with beam 124
on contact 72, is bent to cross plate 142 from one surface
to the other. Notch 154 is provided in outwardly facing
side edge 156 of plate 142 near the free end of finger
148. Fur her rearwardly, lead 158 projects outwardly from
edge 156 after being displaced out of the plane o~ plate
142 by opposite side edge 164 at the corner of the rear
edge 166 of plate 142. As shown, rear edge 166 is at an
angle relative to side edges 156,164.
The offsetting of leads 140 and 158 is required
because of the hole pattern in card 18; i.e. power and
ground holes 18a,18b respectively are in line with signal
holes 18c (Figure 1).
Signal contact 76 (Figure 6C) includes receptacle 168
at one end, lead 170 at the opposite end, retaining
section 172 behind receptacle 168 and strap 174 which
extends between and connects lead 170 to section 172.
Receptacle 168 is formed from opposing resilient beams
176. Retaining section 172 includes an obliquely
outwardly extending resilient leg 178. Strap 174 is bent
forty five degrees at two spaced-apart locations to
position lead 170 at a ninety degree angle relative to
Figures 7A and 78 illustrate the positioning of
contacts 72,74,76 in hous.ing 70 to form second connector
Power contacts 72 (Figure 7A) are inserted, from rear
face 88, into slot~ 100 which are adjace~t side 82.
Cantilever beams 124 are adjacent front surface 86 and
leads 140 project laterally from housing 70 on the same
side as side 80. Retention is accomplished by nose 114
entering notch 132 and tab 138 engaging ledge 117.
Ground contacts 74 (Figure 7A) are also inserted from
rear face 88 into slots 100 adjacent side 80. Cantilever
beam 146 is adjacent front surface 86 and lead 158
projects laterally from housing 70 between lead 140 on
contact 72 and side 80. Retention is provided by nose 114
entering notch 154 and tab 162 engaging the end of wall
Signal contacts 76 (Figure 7B3 are inserted into
passages 94 from rear face 88 with receptacles 168 being
adjacent openings 108. Leads 170 project laterally from
housing 70 on the same side as side 80. Retention is by
an interference ~it between passages 94 and retaining
sections 172. Straps 174 bear against beveled ends 110 of
walls 102 except ~or contacts 76 positioned in the passage
94 adjacent ~ide 80. In this case, strap 174 i5 bent once
ninety degrees and it rests on the free end o~ side 80.
Leads 140,158 and 170 are adapted for insertion into
holes 18a, 18b and 18c respectively of card 18 and
retained therein by soldering.
Figures 8A and 8B illustrate connectors 12 and 14
engaging one another. Connector 14 is placed into cavity
36 o~ connector 12 so that contacts 72,74 and 76
respectively electrically engage contacts 28,30 and 32 in
connector 12. More particularly, as shown in Figure 8A,
cantilever beams 124 and 146 on power and ground contacts
72,74 respectively slidingly engage blades 58 on power and
-13- ~ 3 ~
ground contacts 28,30. The resilient deformation of
cantilever beams 124,146 notes above provides the needed
normal force against blades 58. As shown in Figure 8B,
pins 62 on signal contacts 32 in connector 12 enter
receptacles 168 on signal contacts 76 in connector 14.
~igures 9A-9D illustrate a modification to first
connector 12. Housing 180 of modified first connector 182
includes separate columns 184 each with a power passage
186 and ground passage 188. Column 184 alternate with
column 190 of four sigr~al passages 46 each. Channels 186a
and 188a extend straight inwardly towards each other from
respective passages 186,188.
Power contact 192 and ground contact lg4 for use in
housing 180 are shown in Figure 9B. Each contact 192,194
includes compliant section 50, lead 52, retaining section
54 and blad~ 58 with the latter component being o~fset
from the first three by a straight strap 196.
Figure 9C shows connector 182 with a column 190 of
signal contacts 32 in passages 46 and Figure 9D shows
connector 182 with a column 184 of one power contact 192
and one ground contact 194. Retaining sections 54 are
positioned in respective passages 186 and 188 and straps
196 are positioned in respective channels 186a and 18~a.
These views show that pins 62 on contacts 32 are in the
same relation with blades 58 on respective contacts
192,194 as with first connector 12. Accordingly, first
~ 3 ~
connectors 12 and 182 are interchangeable; i.e., each ~an
be used with second connector 14 without modi~ication
Figures lOA,lOB and lOC illustrate a modification to
first connector 182 and contacts 192,194. Channels 186a
and 188a in housing 198 of first connector 200 continue
inwardly and join each other to form a single channel 202
which extends across the width of cavity 36 and
interconnects passages 186,188 as shown in Figures lOA.
Contacts 192,194 are modified by being made as a single
unit as shown in Figure lOB and indicated by reference
numeral 204. Double score lines 206 are provided across
the width of strap 208 intermediate the ends so that
contact 204 may be separated into contacts 192,19~ by
breaking strap 208 along score lines 206.
Figure lOC shows contact 204 positioned in respective
passages 186,188 and strap 208 in channel 202 in housing
198 to form first connector 200.
Contact 204 permits the user to dedicate it to an all
ground use, an all power use or to separate it into
aforementioned contacts 192,194.
As with contact 204, contacts 72,74 can also be
formed into a single contact 210 shown in Figures llA,llB
and llC. Double score lines 212 are provided on plate 214
permitting the user the option of breaking contact 210
into separate contacts.
Contact 210 includes another modification vis a-vis
contacts 72,74. Leads 216,218 project outwardly ~rom and
on the same plane as plate 214. This contraæt to leads
140,158 which are offset so as to engage holes 18a,18b in
card 18 ~Figure 1). The use o~ leads 216,218 require that
holes 18a,18b be staggered (not shown) relative to signal
holes 18c. Leads 216,218 can be formed o~f-setting plate
214 however if desired.
Figure llB shows contact 210 positioned in second
connector 14. The use of contact 210 in second connector
14 does not require the modification thereof or of ~irst
connectors 12,~82 and 200.
Figures 12A and 12B illustrate a modi~ication to
contacts 72,74 as noted above with respect to contact 210;
i.e., leads 220,222 are on the same plane as plates
224,226 of respective contacts 228,230. As noted above,
the use of leads 220,222 require a modification (not
shown) to the hole arrangement cn card 18. In all other
respects, leads 220,222 are the same as leads 72,74.
Figures 13A and 13B illustrate signal contact 232
and 234 respectively which can be used i~ second connector
Contacts 232 include receptacle 236 at one end, lead
238 at the opposite end and retaining section 2~0, strap
24~ and carrier strip 24~ .in between.
Contacts 232 are s~amped and formed from flat s~ock,
and except for beams 246 of receptacle 236, remains i~ a
flat shape. Beams 246 are folded up out of the plane of
the rest of the contact 232, and converge at convex
surfaces 248 adjacent free ends 250. One advantage of
forming contacts 232 in this manner is that convex
surfaces 248 can be accurately plated prior to being
Retaining section 240 includes barbs 252 which dig
into the walls defining passages 46 to retain contacts 232
in housing 70~
Contacts 232 are positioned in housing 70 so that the
width of leads 238 and straps 242 are normal to the
longitudinal axis of second connector 14 such as shown
with respect to contacts 234 in Figure 14. This is
opposite the positioning of leads 170 and straps 174 on
contacts 76 as shown in Figure 7B.
As is well known in the art, contacts 232 are GUt
away from carrier strip 244 prior to being loaded into
Contacts 234 shown in Figure 13B retain the
receptacles 168 and retaining section 1~2 of contacts 76
(Figure 6C). Straps 254 and leads 256 retained in the
same position as stamped, so that, as shown in Figure 13C,
the widths thereo~ are normal to the housing axis.
One advantage of contacts 232,234 is that ~he straps
242 and 25~ do not need to be bent; i.e., the shape
desired is obtained in the initial stamping operation.
As shown in Figure 14, and as compared to housing 70
shown in Figure 8B, housing 258 of second connector 260
has been modified to accept straps 242 and 254 of
respective contacts 232,234. The modification includes
reducing the width of housing 258 by reducing the length
of sides 262,264, walls 266 and omitting a wall between
columns 90 an~ columns 96. With first connector 12
providing a reference point, one can see that all of the
aforementioned components, sides 262,264 and walls 266,
are much shorter than corresponding sides 80,82 and walls
102. Further, free ends 268 are rounded rather than being
Figure 15 shows yet another modification to either
contact 72, 210 or 228. Contact 270 includes ear 272
which is shown attached to edge 274 and bent normal to
plate 276. With contact 270 positioned in housing 258 ear
272 extends between a pair of adjacent straps 234 or 254
of respective contacts 232,234 in an adjacent column and
thus isolates the two adjacent straps. Ear 272 may be
place on opposite edge 278 (not shown) as well as edge 274
to isolate other pairs of straps 234,254.
Several embodiments of some of the component
comprising system 10 have been shown. Of these, the
-18~ 7 3 ~
preferred first connector is connector 200 in conjunction
with contacts 204. Should the user dedicate a con~act 204
to ground strap 208 provides a continuous shield across
the width of cavity 36. Secondly, and so noted above, the
user has the option of keeping contact 204 intact or
separating it into two separate ones.
Housing 180 or 198 are preferred, apart from being
able to use contacts 204, from the standpoint of
staggering passages 1~6,188 relative to signal passages 46
and from the standpoint of ease in molding straight
channels 186a,188a, 202 as opposed to curved channels
42a,44a. In this regard, contacts 192,194 and 204 are
easier to stamp and form than contacts 28,30.
Second connector 258 (Figure 14) is preferred from
the molding viewpoint and contacts 210 for the optional
feature mentioned above. Leads 216,218, 220 and 222 are
preferred because they do not need to be bent out o~ the
plane of respective plates 214,224 and 226.
Signal contacts 232 are slightly preferred over
contacts 76 and 234.
In describing first connector 12 and second connector
14, contacts 28,30,72 and 74 were designated as either
being power or ground. As is well known in the art, the
actual use is determined by the back panel and circuit
card design. The designations were for a prePerred use;
e.g., a longer blade 5~ on a ground contact 30, but not
for an only use.
Components structures deemed equivalent to those
disclosed herein would include leads
52,140,158,170,216,220,22,~38,256 adapted to be surface
soldered to circuit pads (not shown) on back planes and
circuit cards; twin beams contacts in lieu of cantilever
beams 124,146; box receptacles for twin beam receptacles
168,236; and leads 52, etc. extending outwardly from a
surface of dielectric housings 20,70,180,198 not otherwise
In the several connector embodiments illustrated and
described herein, contacts 28,30,72,74 and the
modification thereto have been shown oriented transversely
to the longitudinal axis of connectors 12,14 and
modifications thereto. However, it is intended to
include, within the scope of the present invention,
contacts 28,30,72,74, etc. being oriented parallel to the
longitudinal axis; i.e., between adjacent rows of signal
contacts 32,76 rather than between columns thereof as
shown in the illustrations.
Another modification which is intended to be included
within the scope of the present invention relates to
plates 118,142 of respective contacts 72,74 and
modifications thereto. Plates 118,142, etc. are shown as
being flat. However, these plates may advantageously be
made to include vertical ribs or the like projecting
perpendicularly outwardly from the plates and in between
adjacent signal contacts 32,76 in the adjacent columns
Figure 16 shows electrical connector system 300 which
includes first connector 12, described hereinabove, and
second connector 314 which includes insulating housing
336, signal contacts 338 and ground contacts 340. As
shown, housing 336 includes section 342 which fits into
cavity 36 of connector 12. Shown above connector 314 is
substrate 344 having plated through holes 34~. Substrate
344 is mounted onto connector 314 with signal contact
leads 348 and ground contact leads 350 being received in
appropriate holes 346.
Passages 352 in housing 336 which receive ~ignal
contacts 338 are shown in Figure 17. In the illustrated
embodiment, a column comprises four passages 352 extending
between sidewalls 354 of housing 336; i.e., a column is
defined h~rein as extending across the width of housing
336 and a row is defined herein as extending
longitudinally from end to end of housing 336. These
definitions agree with industry usage.
Each passage 352 includes a funnel shaped opening 356
providing access thereinto on front surfac 358 of housing
336. Further, passages 352 open out on rear surace 362
of housing 336 as indicated by reference numeral 364.
.' ~ .
Slots 366 in hou ing 336 which receive ground
contacts 340 are shown in Figure 18. There are ~wo slots
366 per column and they are isolated from adjacent columns
of signal passages 352 by transverse walls 368. Each slot
366 opens out on front surface 358 and rear surface 362 as
indicated by reference numerals 370,372, respectively.
Inwardly projecting nose 374 is provided on outer walls
376 of slots 366. Further walls 376 slant outwardly
towards sides 354 in the rearward direction as indicated
by reference numeral 378.
As is well known in the industry, housings 322 and
336 are molded from a suitable plastics material such as
high temperature thermoplastic.
As shown in Figure 19, signal contact 338 includes a
twin beam receptacle 382, retaining section 384, and
aforementioned lead 348. Lead 348, which includes
outwardly facing shoulders 386, is attached to and offset
from connecting strap 388 with the offset being indicated
by reference numeral 390.
Ground contacts 340, shown in Figure 20, include a
cantilever beam 392 extending ~orwardly in slot 394 cut
into a relatively thin plate 396. Slot 394 defines
resilient legs 340a on each side thereof. Notch 398 is
provided in side 400 of plate 396 adjacent front end 402.
Rearwardly side portion 404 of side 400 slants obliquely
laterally, terminating in the aforementioned lead 350.
The two contacts 340 shown in Figure 20 are identical with
one being turned around.
Figure 21 shows signal contacts 33B positioned in
passages 352 and Figure 2~ shown ground contacts 340 in
slots 366 to form second connector 314. Retaining
sections 384 frictionally holds contacts 338 in passages
352 with receptacles 382 open to openings 356. Leads 348
project rearwardly from rear opening 364. As shown,
contacts 338 in the pairs of passages 352 on each side of
median wall 406 of housing 336 are positioned therein in
an opposite orientation. Leads 348 are on the same center
line as receptacles 382 by reason of offsets 390.
Contacts 338 are loaded into passages 352 from rear
opening 364 with the free ends of receptacles 382 abutting
or near shoulder 360.
Ground contacts 340 are retained in 810ts 366 against
pull-out by reason of inwardly projecting noses 374 being
received in notches 398. Slanted side portions 404 bear
against slanted wall portion 378 of walls 376 to prevent
forward movement of contacts 340. As is obvious, contacts
340 are loaded into slots 366 from rear openings 372 with
legs 340a of plate 340 being resiliently cammed in to pass
over nose~ 374 during insertion. Leads 350 extend
outwardly from rear surface 362 on each side of the column
of signal leads 348.
Figure 23 is a view showing connectors 12, 314
mounted on parallel substrates 16, 344 respectively and
mated together whereby signal circuits (not shown) on both
substrates 16, 34~ are electrically interconnected by
engaged signal contacts 32, 338. As shown, posts 62 of
contacts 32 in connector 12 are received in twin beam
receptacles 382 o~ contacts 338 in connector 314.
Figure 24 is a view similar to Figure 23 but showing
ground contacts 28,30 and 340 engaged to interconnect
ground circuits (not shown) on parallel substrates 16,
344. Contact between contacts 28,30 340 is made by
cantilever beams 392 slidingly engaging blades 58.
Reference has been made above to contacts 340 being
used as ground reference planes. However, if desired, one
or more contacts 340 can be used to transmit power. In
this event, blade 58 on a power contact 28 is made shorter
than a blade 58 on a ground contact 30 so that the ground
circuit are interconnected before the power circuits. As
shown in Figure 24 blade 58 on the left hand side is
shorter relative to the blade 58 on the right hand side to
illustrate this dual purpose of contacts 28,30.
As can be discerned, a high density, high frequency
connector system has been disclosed which provides
enhanced signal integrity in high density connector
systems comprising matable first and second connectors
with the former mounted on a back plane and a circuit card
-24- ~ 3 ~
mounted on the latter. Each connector includes a column
and column configuration of contacts for carrying high
frequency signals and alternating columns of contacts for
providing a ground reference to maintain signal integrity.
The ground contacts in one connector include blades
extending outwardly. The ground contacts in the other
connector includes blade-engaging cantilever beams in
slots in plates of substantial width which cooperate to
provide a blanket shield between adjacent columns o~
signal carrying contacts.
For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee and Payment History should be consulted.
|Forecasted Issue Date||1993-06-29|
There is no abandonment history.
|Fee Type||Anniversary Year||Due Date||Amount Paid||Paid Date|
|Registration of Documents||$0.00||1989-12-18|
|Maintenance Fee - Patent - Old Act||2||1995-06-29||$100.00||1995-05-18|
|Maintenance Fee - Patent - Old Act||3||1996-07-01||$100.00||1996-05-16|
|Maintenance Fee - Patent - Old Act||4||1997-06-30||$100.00||1997-05-12|
|Maintenance Fee - Patent - Old Act||5||1998-06-29||$150.00||1998-05-04|
|Maintenance Fee - Patent - Old Act||6||1999-06-29||$150.00||1999-05-03|
|Current Owners on Record|
|Past Owners on Record|
|FEDDER, JAMES LEE|
|SUCHESKI, MATTHEW MICHAEL|