Note: Descriptions are shown in the official language in which they were submitted.
CA 02251515 1998-11-OS
Lingua Translation Services Inc.
1235 Bay St., Ste.400
Toronto, Ontario
Tel.: (416)513-1328
Fax: (416)513-1329
* a division of All Languages Translation Experts,
official member of the Association of Translators
and Interpreters [ATIO]
OFFICIAL TRANSLATION
DECLARATION
DOMINION OF CANADA
PROVINCE OF ONTARIO
h ~ ~~"~R~~""~ , of the City of Toronto in the Province of Ontario
DECLARE THAT:
I hereby certify that I have accurately and carefully translated the attached
copy of
the original documents) purported to be a Document from the Chinese language
into the English language.
DECLARED this 22"d day of September, 1998
for LINGUA TRANSLATION SERVICES INC.
CA 02251515 1998-11-OS
A Summary of the Invention
(Name of the Invention: Projector Level)
rojector level is composed of a bottom plate, a main structure above the
bottom plate, a lid
on the m ' ructure, a connection plate over the lid, a main structure internal
base block hanging
freely from the h ' h a perpendicular bi-axial universal coupling, a group of
laser ray producers
situated on the base bloc , a battery case holding the battery that supplies
power to the laser
producers. On the base block, is a semitransparent projection lens. In front
of the
semitransparent projection lens , there is a ansion lens. Parallel laser rays
go through, and are
reflected by, the projection lens. Those rays going ough the projection lens
proceed through
the expansion lens toform a vertical or horizontal line o surface in front of
the projector.
Those rays reflected by the projection lens form two opposite dots, above the
projector level
and the other below the projector level. These two dots form a pluSeveral
similar
projector levels can be used together, with one situated on the top of the
other, and o_n. The
angles of multiple lines from several projector levels can be adjusted and can
be based 'o~ the
same reference coordinate, which is convenient for construction purposes.
V. Explanation of the Invention
This invention, a projector level, is a level that uses a group of laser rays
to go through a semi-
transparent lens to be projected or reflected on to surfaces. These rays go
along three directions:
forward, upward and downward. The forward rays, after going through an
expansion lens, form a
horizontal or vertical line on a surface. The upward and downward rays go to a
surface above and a
surface below the level, respectively. Several of such projector levels can be
used together. The angles
of the laser rays can be adjusted. This projector level is easy to use in
construction.
The traditional way of getting a vertical line is to use a plumb bob at the
end of a line. Because of the
weight of the plumb bob, the line is straight and vertical. But this
instrument is not very convenient to
carry and use, because it is easily influenced by external factors to swing.
In application, one has to wait
for the swinging to stop before one can make any adjustment on the upper
starting point. The
traditional way of getting a straight horizontal line is to use a spirit level
with water. Workers have to
put water into the level to look at the leveling observation window at an end
of it. It has to be used by
two operators and it is often wet, which makes it inconvenient to use.
Because of the above mentioned reasons, a two dimensional projector for
determining a horizontal or
vertical line was invented (Application No. 80107192, Public Notice No.
174044, US Patent Number
5539990). The main structure of that projector has a group of laser producers,
a reflection mirror and a
grating. The main structure is hung on a supporting frame with a ball joint.
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Disadvantages of conventional projectors in comparison to our invention
include:
I) Existing projectors utilize complex structures and the irregular supporting
frame makes
it inconvenient to carry. Also, conventional projectors cannot be used
together with
similar units, based on the same reference coordinate. In addition, the laser
rays
cannot be adjusted which limits its function as well as the area of where the
unit can be
applied.
2) Conventional projectors require a motor to turn the reflection mirror to
make the
original laser light dot move in a circular motion, continuously, which
results in a
flickering laser light line. The laser rays are scattered, which wastes the
light energy.
3) Conventional projectors may require complex manufacturing and assembly
processes.
Manufacturing cost is high thus making it unaffordable to construction
workers.
4) Conventional methods include the main structure hanging freely from the
supporting
frame with a ball-joint and the main structure requiring to be hung in its
position with
the unit's own weight so that it can project a horizontal or vertical line.
This ball-joint
has a large surface touching other parts of the supporting frame, which
interferes with
the main structure and thus affects its accuracy.
5) Because conventional methods have the main structure hanging freely from
the
supporting frame with the ball-joint, friction occurs. The ball-joint incurs
friction with
other connecting parts. To solve this problem, a heavier weight and a longer
dangling
line may be required A heavier weight may cause the supporting frame to become
more
susceptible to damage during vibrations or impact. Also, a longer dangling
line would
require more free hanging space from the supporting frame, which limits
product
operation.
6) Because conventional methods have the main structure hanging freely from
the
supporting frame with the ball-joint, the two-dimensional projected lines may
not be
accurately aimed at the object under construction with the turning of the
supporting
frame. It is just like one can not, by turning a basin, aim a floating object
in the basin
of water at an external point. Thus, convenience is highly affected.
The purpose of the present invention is to provide a projector that can be
used conveniently. This new
projector is composed of a bottom plate, a main structure above the plate, a
lid on the main stn~cture, a
connection plate over the lid, a main structure internal base block hanging
freely from the lid with a
perpendicular bi-axial universal coupling, a group of laser ray producers
situated on the base block, and
a battery case holding a battery that supplies power to the laser producers.
On the base, there is a
semitransparent projection lens. In front of the semitransparent projection
lens, there is an
expansion lens. Parallel laser rays go through and are reflected by the
projection lens. Those rays
CA 02251515 1998-11-OS
through the projection lens continue to flow through the expansion lens to
form a vertical or horizontal
line on the surface in front of the projector. Those rays reflected by the
projection lens form two
opposite dots, one above the projector and the other below the projector. The
lid of this projector and
the bottom plate are parallel, and they are co-axial. They are shaped in a way
so that several similar
projectors can be used together, with one situated on top of the other and so
on. Furthermore, the
angles of the laser rays can be adjusted, which is convenient for construction
application. With the
expansion lens, the forward aiming rays are turned in a line, displaying on
the surface in front of it. The
additional opposite upper and lower light points are also useful for
constn.iction application.
Moreover, gravity centre of the base block and the semitransparent lens are
both designed for
convenient fine tuning in factory as well as for future servicing purpose.
The following detailed technical explanation, together with the appended
illustrations, describes the
main structure and its various parts clearly.
Illustrations:
Illustration 1 shows the various parts of the projector in a three-dimensional
way.
lllustration 2 is another three-dimensional display of the projector.
Illustration 3 is a three-dimensional picture of the projector's external
appearance.
Illustration 4 demonstrates how three projectors work together.
Illustration 5 is a dissection picture of three projectors used together.
Illustration 6 shows, in a three-dimensional way, the base block and various
parts within the block.
Illustration 7 shows, in a three-dimensional way, the base block and various
parts within the block,
with the expansion lens vertically situated in front of the projection lens.
Illustration 8 shows, in a three-dimensional way, the base block and various
parts within the block,
with the expansion lens horizontally situated in front of the projection lens.
Illustration 9 shows, with a dissection picture, the base block and various
parts within the block,
illustrating how the gravity-centre of the block can be adjusted by tuning the
gravity weight.
Illustration 10 is a rear view of the base block.
Illustration 11 and Illustration 12 display how the angle of the projection
lens in the base block can
be adjusted by tuning the screws.
Illustration 13 demonstrates how one expansion lens changes the directions of
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Explanation of the
illustration numbers:
Bottom plate 11 Protruding disc
12 Opening 13 Indicator
14 Mortise 20 Main structure
21 Container 22 Front opening
23 Glass 24 Bottom and lid openings
25 Indented circle 26 Protruding rim
27 Battery room 28 Measurement
30 Lid 31 Lid opening
32 Coupling slot 40 Connection plate
41 Protruding disc 42 Upper opening
43 Tenon 50 Base block
51 Dangling block 511, 512
Axes
52 Lens compartment 53 Front block
54 Back block 55 Laser module hole
56 Projection hole 57 Expansion lens groove
58 Screw 59 Base block opening
60 Laser producer group 61 Gravity weight
70 Battery case 71 Battery
72 Wiring 80 Semitransparent projection
lens
81 Positioning plate 82 Screws
83 Adjustment plate 84 Curve plates
85 Hooks 90 Expansion lens
As demonstrated in illustrations 1 and 2, this projector level has a bottom
plate 10, a main structure 20
above the bottom plate, a lid 30 on top of the main structure, a connection
plate 40 above the lid, a
base block 50 that hangs freely from lid 30 with a perpendicular, bi-axial
universal coupling in main
structure 20, a laser module 60 situated on base block S0, a battery case 70
that supplies laser module
60 with power, a semitransparent projection lens 80 on the base block 50, and
an expansion lens 90.
Bottom plate 10 has a protruding disc 11, which is naturally indented at its
base (see illustration 5).
Opening 12 is in the centre, and there is indicator 13 at the circumference.
Mortise 14 is at the base of
bottom plate 10.
In the centre of main structure 20, there is container 21, which has a V-
shaped opening 22 in the front.
There is a piece of glass at opening 22, and at the base of container 21 there
is bottom opening 24 (see
illustration 5). The base of bottom opening 24 has indented circle 25 to fit
protruding disc 11 on
bottom plate 10. Bottom opening 24 has protruding rim 26 to fit opening 12. As
well, with protruding
rim 26, main structure 20 can be turned on bottom plate 10. On each side of
the main structure 20, a
battery room contains battery case 70. At the base circumference, there is
measurement 28, together
with the indicator on bottom plate 10, to indicate the angle turned between
main structure 20 and
bottom plate 10.
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CA 02251515 1998-11-OS
Covering main structure 20, (id 30 has, in its centre, lid opening 31, which
has coupling slots 32 on two
sides.
In its centre, connection plate 40 has protnrding disc 41, and protmding disc
41 has at its base a
natural circular indention (see illustration 5). In the centre of protruding
disc 41 is upper opening 42.
On the surface of connection plate 40, there is tenon 43, which can fit into
the mortise 14 of bottom
plate 10 of another projector level, and these two projectors are positioned
with the same axis at the
same angle.
With perpendicular bi-axial, universal coupling, axis 511 situated in coupling
slot 32 of lid 30 and axis
512 connect dangling block 51, from which base block SO hangs. Base block 50
balances itself with its
own gavity. In the centre of base block 50, lens compartment 52, where
semitransparent projection
lens 80 sits, divides base block 50 into two parts: front block 53 and back
block 54. Base block
opening 59 is at the bottom of lens compartment 52. Laser module hole 55 goes
through the centre of
back block 54, and projection hole 56 goes through front block 53. Projection
hole 56's position is
exactly the opposite of the position of laser module hole 55. In front of
front block 53 there is a
horizontal or vertical expansion lens groove 57 across projection hole 56 (see
illustration 6) to receive
expansion lens vertically or horizontally. Near the top of front block 53, on
two sides, two screws 58
go through front block 53 and reach back block 54. With the screwing of screws
58, tiny changes in
the distance between front block 53 and back block 54 can be made (see
illustrations 11 and I 2).
Laser module 60 is a group of lights that can produce parallel rays. Situated
in laser module hole S5,
laser module 60 is fitted with eccentric gravity weight 61 at its rear end.
With turning gavity weight
61, you can change the position of the gavity centre. Because laser module 60
is a familiar product, it
is not described in details here.
Inside battery case 70, there is battery 71, which, connected with laser
module 60 by helical wiring,
provides laser module 60 with power.
Semitransparent projection lens 80 can be a zero dioptric lens or a triangular
prism. The degree
between semitransparent projection lens 80's light receiving surface and laser
module 60 is 45~. A
zero dioptric semitransparent projection lens 80 can only transmit forward
going rays and reflect a
upward going ray, while a triangular prism can transmit forward going rays,
reflect an upward going
ray and reflect a downward going ray (see illustrations 6, 11 and 12).
Positioning plate 81 and screws
82 keep semitransparent projection lens 80 in lens compartment 52 on base
block 50. As part of
positioning plate 81, adjustment plate 83 extends downward at an angle of 70
to the curve plates 84,
which have, at their tops, middles and bottoms hooks 85, to hold
semitransparent projection lens 80
in its place.
Expansion lens 90 is a cylinder, or a half cylinder or a FRESNEL lens (see
illustration 13) that
transmits rays, and spreads the rays (see illustrations 7, 8 and 13) into a
plane.
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Following illustrations 1 and 2, install laser module 60, semitransparent
projection lens 80 and
expansion lens 90 on base block 50, with perpendicular bi-axial universal
coupling, use axis 511, axis
512 and dangling block 51 to assemble base block 50 to the bottom of lid 30,
cover main structure 20
with lid 30, make sure base block SO with all its parts is in container 21,
connect power from battery
case 70 with laser module 60, put main structure 20 on bottom plate 10, put
connection plate 40 on
top of lid 30, and you have a projector level as shown in illustration 3.
As shown in illustration 4, situated in a room, parallel rays from laser
module 60 are transmitted and
reflected by semitransparent projection lens 80 to form forward, upward and
downward rays (see
illustrations S and 8). Going through expansion lens 90, the forward rays come
out of the front of main
structure 20 to draw a horizontal or vertical line on a surface. Whether the
line is horizontal or vertical
depends on the orientation of the expansion lens assembly 90 (in part or in
whole) (see
illustrations 7 and 8). The upward and downward rays display a marked point on
upper and/or lower
surfaces. Together, these rays serve the purpose of alignment.
As shown in illustration 5, the shape of "the projector level" is a cylinder,
and several of them can be
stacked together. In addition, because of the mortise on bottom plate 10 and
the tenon on connection
plate 40, several projector levels can be used with the same axis. They can
also be turned around to
needed degrees, and indicator 13 and measurement 28 demonstrate the degrees
turned. You can use
several projector levels to draw multiple parallel lines or multiple lines
that cross each to serve your
different construction purposes.
Furthermore, because gravity weight 61 fitted to the rear end of laser module
60 is eccentric, the
position of gavity weight 61 decides forward or backward gravity centre of
base block 50, that is, the
forward or backward dip angle of base block SO when it hangs there freely (see
illustration 9). By
turning gravity weight 61, you can move the gravity centre towards left or
right, that is, the left or right
dip angle of base block 50 when it hangs there freely (see illustration 10).
Semitransparent projection lens 80 can be a zero dioptric lens or a triangular
prism. The degree
between semitransparent projection lens 80's light receiving surface and laser
rays must be 45~. While a
triangular prism has its surface receiving laser rays at the angle of 45 by
itself, a zero dioptric
semitransparent projection lens must be positioned at 45~ with positioning
plate 81 (see illustrations
11 and 12). Because the degree between adjustment plate 83 and curve plates 84
is 70 , you can finely
adjust a zero dioptric semitransparent projection lens 80's degree to the
correct angle to make
accurate measurements.
The above explanation can be summarized into the following points:
1) The structure of this invention is unique as well as simple. Based on the
same reference
coordinate, several projector levels can be used together to produce multiple
horizontal and
vertical lines and a pair of plumb line dots, which can be applied at
different places to optimal
effects.
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CA 02251515 1998-11-OS
2) With the indicator and the measurement, the relative degree can be
determined, which is easy
to use for constnrction workers.
3) With the expansion lens turning parallel rays into a line to be shown on a
surface, there is no
flickering.
4) With the position of the expansion lens, you can decide whether you want to
draw a horizontal
or vertical line.
5) With the semitransparent projection lens, you can project a plumb line dot,
which is a unique
character of this invention.
6) Because of the uncomplicated structure and easy assembly, the manufacture
cost is not high.
7) With a dangling block, axes and universal coupling, the base block hangs
freely from the lid.
The axes are fine and smooth, and with little fi-iction, the flexibility of
the base block's dangling
is kept. With a short swing aria and a light swing weight, the accuracy of the
level is
maintained.
8) With a short swing arm, the swinging time of the base block is short, and
one can quickly get
an accurate measurement.
9) With the position of gavity weight, the dip angle of the parallel rays from
the laser module can
be correctly adjusted. With the adjustment plate, the receiving surface of the
semitransparent
projection lens can be kept properly at 45' with the laser rays. Unrelated to
the assembly of the
lid and the bottom plate, the above mentioned two characteristics let the
construction worker
complete the optical correction quickly and perform measurements in a fast and
accurate
manner.
To put a long story short, this invention rectifies the shortcomings of a
traditional projector level and
has unprecedented fi~nctions. It made progress upon traditional measurement
tools and has industrial
application value. The structure and its characteristics of this invention are
in accordance with the
application conditions of your patent act. We respectfully request that your
Bureau inspect the
invention carefully and give it an appropriate new patent. Thank you ever so
much.
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