Note: Descriptions are shown in the official language in which they were submitted.
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Background of the Invention
The invention relates to a flyback transformer for
use in a television rec~iver, and more particularly to the
construction of a connector for a high tension lead wire which
is used to supply a transformer outpu-t to the anode of a
cathode ray tuhe.
Recehtly a flyba~k transformer is manufactured in
compact overall configuration by forming an integral coil
assembly which is mounted on a core. The coil assembly includes
a low tension and a high tension coil and a rectifier for
rectifying a high tension output from the high tension coil,
these components being integrally encapsulated in
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an insulating resin. sy way of example U.S. Patent No. 3,229,
149 (issued Jan 11, 1966 to Yasushi Watanabe et al) discloses
an output end of a high tension coil which is perman~ntly con-
ne~ted througll a diode with a high tension lead wire, with the
coil and the diode as well as the junction therebetween being
integrally encapsula-ted in a wax, rubber or syn-thetic resin.
Ilowever, in this arrangement, if a failure is found in either
coil assembly or higll tension lead wire in the course of the
manufacturillg~ the entire assembly must be disposed as defective,
~ a ~,hus causillg an increased waste and cost. A relatively large
~hiclcn~ss and high stiffness of the high tension ]ead wire pre-
~en~d difficulties and de~raded the operational efficiency when
a ~inished flyback transformer is packaged, shipped or mounted
on a television receiver where the entire assembly is integrally
encapsulated in synthetic resin.
` U.S. Patent No. 4,016,478 (issued April 5, 1977 to
Iler~ert ~ndes et al) discloses a flyback transformer which avoids
such problems. Specifically, in -the disclosed transformer, the
higll tension lead wire is not permanently connected with the coil
~0 as~cmbly, but is connected therewith through a socket connector
so as to be replaceable whenever necessary. The socket connector
c~n~prises a soc~et provided on the part of the coil assembly, and
a plu~ attached to the high tension lead wire. The socket com-
pL^ises ~ cylindrical portion having a plurality of slits former
t.herein, and a clamping screw which threadably engages around the
cylindrical portion for exerting a centripetal pressure thereto.
The end of the high tension lead wire which includes the plug is
inserted into the cylindrical portion and is firmly gripped therein
by tightening the clamping screw. ~owever, with a flyback trans-
former of this type, the clamping screw must be turned whenattaching the lead wire to a television receiver, and a satis-
factory electrical connection may not be achieved if the operation
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is imperfect. Since it is usually unnecessary to remove the l~igh
tension lead wire after the fly~ack transformer is once mounted
on the television receiver,
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it is desirable that the lead wira be locked in place after such
mounting.
Summary o~ the Invention
It is an object of the invention to provide a flyback
transformer having an associated high tension lead wire which is
separately manufactured and which is adapted to be rigidly
connected with the transformer in locked manner after the
transformer has been mounted on a television receiver.
It is a specific object of the invention to provide
a flyback transformer having a connector for a high tension
lead wire which is simple in construction and easy to manufacture.
It is another object of the invention to provide a
connect~r for high tension lead wire which prevents an electric
discharge which may occur along the lead wire.
It is a further object of the invention to-provide
a connector for high tension lead wire which prevents ingress
of moisture.
In accordance with the invention, there is provided
a flyback transformer for a television receiver including a core,
a co~l assembly mounted on the core and including a low tension
and a high tension coil and also including a rectifier connected
with the high tension coil for rectifyiny a high tension output
therefrom, the coil assembly being contained in an enclosure of
an electrically insulating material together with the rectifier,
a high tension lead wire having an insulating coating, and
astener means for providing an electrical connection between
the high tension lead wire and the rectifier; characterized in
that the fastener means comprises a tubular connector bod~ -
formed of an electrically insulating material and having one end
of a greater inner diameter than that of the other end, a step
being formed inside said body where the inner diameter thereof
changes, the connector body being supported by the enclosure
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and having said other end opening outside the enclosure, said
other end being formed with a plurality of substantially axially
extending slits with a plurality of inwardly extending lips
at the ends thereof, a conductive cap fitted into the space at
said one end of the connector body and positioned against the
step and electrically connected with the rectifier, and a
fastener of an elect.rically conductivematerial firmly mounted
on and electrically connected with the high tension lead wire
and adapted to engage the conductive cap and to be locked by
the step as the end of the high tension lead wire is inserted
into the connector body, said fastener means including a resilient
insulating cap fitted on the end of the high tension lead wire
: and which is adapted to be fitted over said other end of the
connector body to resiliently urge the lips inwardly to firmly
grip the high tension lead wire. ~
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In a preferred embodiment of the invention, said other
end of tne connector body projects out of the enclosure and com-
prise a piurality of axially extending li~s formed ~y a plurality
of slits t~lerebetween, each lip having a slight inward projection.
An insulating cap of a resilient material is disposed around the
end of -the high tension lead wire, and urges the individual lips
inwaraly so that their projections firmly grip the high tension
lead wire when the end of the lead wire is inserted i~to the con-
nector body.
10Brief Description of the Drawings
Fig~ 1 is a schematic view, partly in section, of the
flyback transformer according to -the invention before it is
coupled with a high tension lead wire;
; Fig. 2 is a perspective view of a fastener shown in
Fig. l;
Fig. 3 is a fragmentary view, partly in section, of the
flyback transformer coupled with the high tension lead wire;
Fig. 4 i5 a fragmentary, schematic view of another
embodiment of the invention in which the flyback transformer
incorporates insulating casing; and
Fig. 5 is a sectional view of a modification of the
conductive cap shown in Figs. 1 and 4.
Description of Preferred Embodiments
Referring to Fig. 1, there is shown a coil assernbly 10
~hich is fitted on the upper limbs of a pair of U-shaped core
halves 11, 12. The assembly 10 comprises a coil bobbin 13, and
a low tension and a high tension coil, generally shown at 14,
which are disposed on the bobbin, It will be understood that the
core halves 11, 12 are clamped together by known clamping means
to interconnect them, thus forming a closed magnetic path extend-
ing through the low tension and the high tension coil. A hollow
cylindrical connector body 20 is formed of an electrically insulat-
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ing resin material, and its one end 2~ includes an extension
which is secured to ~he bobbin 13. The other end of the con-
nector body 20 is formed with four axially ex-tending slits 21,
" thereby forming four resillent lips 22. At its free end, each
lip 22 carries an inwardly ex-tending projection 221 of a short
length which extend toward the center axis of the connector body.
~aid one end 24 of the connector bod~ 20 has a greater inner
diameter than the other end, thereby forming a step 23 there-
between. The end 24 is closed by a conductive cap 25 of an
electrically conductive material such as brass which is Eitted
into the end 24 and frictionally retained against the step 23.
A rectifier 15 wllich may comprises silicon diode is connected
' between the output end of the high tension coil and the conductive
cap 25. The coils 14, rectifier 15 and connector body 20 includ-
ing the conductive cap 2~, exclusive of the region of the lips 22
', at the other end thereof, are encapsulated b~ ~ltegrally moulding
' an insulating layer ]6 made of a silicone rubb~r 1-2 polybutadiene
,~ resin or epoxy resin therearound.
A high tension lead wire 30 having an insulating coat-
ing is prepared separately from the coil assembly 10. At its
one end, the high tension lead wire 30 is mechani,cally and elec-
trically connected with an anode cap 31 for connection with -the
anode of a cathode ray tube (not shown) while the other end is
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" soldered with a fastener 32 of a resilien-t conductive material
~" such as pihospllor bronze. Adjacent to the other end of the lead
' wi,re 30, an insulating cap 40 is slidably fitted thereon. As
shown in Fig. 2, the fastener 32 comprises a disc 321 of substan-
tially the same diameter as the outer diameter of the lead wire
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~`~ 30, and a plurality of wings 322, four in the example shown,
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~ 30 which are disposed at an equal interval around the circumference
`~ of the disc 321 and extend radially outward. The disc 321 is
,~' centrally formed with an opening 323 for passing the conductor
of the lead wire 30 therethrough. In this manner, the fastener 32
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is in the Iorm of an arrowhead at the end of the high tension lead wire 30O
The insulating cap 40 is formed of a material such as silicone ruhber,
for example, and includes a base 41 which slidably engages the lead
wire 30, and a cylindrical cover 4~. As will be described later, the
cover 42 is sized and configured in connec$ion wi~ the outer perip~ery
o~ the connector body 20,
Describing now the connection between the lead wire 30 and
the connector body 20, the Iastener ~2 is pressed into the connector body 20.
~t this time, ~e lips 22 at the other end OI the connector body 20 are -
spread radially outward while ~e wings 322 on the fastener 32 are
compressed inwardly. When ~e fastener 3~ moves past ~he projections 221 `~
of the lips 22, the lips 22 return to their original position. The wings 322
of the fastener remain compressed even ~ough they may slightly restore
resiliently. When the lead wire 30 is driven furSher inward into ~e ;
connector body 20, t~e fastener 32 evelltually enters the interior o the
conductive cap 25, whereupon the wings 322 are al:Lowed to spread outward
into contact with the conductive cap 25. In this manner, ~e lead wire 30 ~ ;
is locked against withdrawal by virtue o~ the en~age~ent o$ the wi~gs 322 ;
against the step 2~ formed in the cormector body 20.
When mounting, the anode cap 31 is conneoted wi~ ~he arlode of
a ca~ode ray tllbe, and the insula~ing cap 40 is fitted over that portion
of t~e connector body 20 which is ea;posed o~t of ~e illsulating layex 16
By choosing an inner diameter of ~e cover 42 which is slightly less tha~
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the outer diameter of the adjacent end of ~e connsctor body 20, ~e
resilience of the material of the cover 42 urges th0 lips 2~ radially
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ward to oause the projection~ 221 to bear against the high tenBion
lead wire 30 with a su~icie~ force to prevent a~ angular moveme~t
thereo~ about its a~is. ~ ;
As will be noted rom Fig~ 3, with the arrangement o the in~e~io
the wings 322 Oll the ~astener 30 engage the con~uctive cap 25 a~ soon as ~ `
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the end of the wings is engaged with the step 23 in the connector body 20,
~iUS preventing a withdrawal thereof and completing a connection ~hereof
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:1 wi1~ the rectified high tension output from the recti:~ier 15. The
. ' insulating cap 40 covers thie entire e~po~ed portion of the connector
5I S body 20, thus preventing i~gress oP moisture into the connector body
and al80 preventing a discharge from ~e i~ternal parts thereof. ` -
Fig. 4 shows ano~er embodimer~ of the invention in which the coil
a~sembly and the rectifler of the flyback trans~ormer are separately . ` -~
contained iIli a common in~ulating casing 50. In ~iis Figure, part~
corresponding to those shown in Figs. 1 to 3 are desi~ated b~ like
numerals. The casing 50 includes a core receiving cylindrical portion 51
around which a low tension and a high tension coil 17, 18 are concentricall~
mounted~ The insulating case 50 includes a detent, which mate~ with
a radial rib 61 for:~ed peripherally of a connector body 60, ~us supportinig
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- ~ 15 the latter. The connector body 60 is constructed in the ~imilar manner
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a~ the connector body 20 and ~erefore will not be de~cribed, Lip~ 22
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projects out oP the casing 50, a~di a conductive cap 25 loc~ted at ~lQ other
e~d of the casing 50 is electrically connected through a rectlfier 15
. disposed therein with the high tension Goil 18~ The ho~low ~pace wilhin` . `;
~' ~ 20 the casing 5û is filled with a name-proof insulating re~in.
Fig~ 5 shows another Iorm o~ the conductive cap. In this example,,
a conductive cap 2~ is again U-shaped in cro~s ~ection, and has an
inwardly curved edge 261 $ormed around ~e opening for engageme~
- with the step 23 in the connector bodyc The edge 261 is adapted to mate;
. 25 with the WiIlg~ 322 OI t~e fastener 32J l~us improving the electric~
connection between ~e cap 26 and the ~a~tener 32.
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