Cassette for loading glasses for liquid crystal display device

Details Cassette for loading glasses for liquid crystal display device Cassette for loading glasses for liquid crystal display device

1996-09-06

2001-02-13

Johnson, Blair M. (Department: 3634)

Supports: racks

Special article

Platelike

C211S041180, C211S041140

Reexamination Certificate

active

06186344

ABSTRACT:

BACKGROUND OF THE INVENTION
(1). Field of the Invention
The present invention relates to a cassette for loading glasses for liquid crystal displays and a method for discharging electrostatic charges generated in glasses.
(2). Description of the Prior Art
Nowadays, a liquid crystal display is widely used due to its properties of slim thickness, light weight and low power consumption. In manufacturing the liquid crystal display, a glass is used as a back-frame of the device and the step of transferring the glass is necessary. When the glasses are transferred to another place, they are loaded on cassettes and the cassettes are carried by men or machines.
Hereinafter, the cassette for loading and carrying the glasses will be explained with reference to the attached drawings.
FIG. 1
is a perspective view of a conventional cassette for loading the glasses, and
FIGS. 2 and 3
are a front and a side view of the conventional cassette shown in
FIG. 1
, respectively.
As shown in
FIGS. 1
to
3
, the conventional cassette
10
for loading the glasses comprises side plates
11
having slots
15
formed of protrusions
15
′ for loading the glasses therein, a bottom board
12
and a top board
13
. The cassette
10
further includes stoppers
14
for preventing the drifting away of the glasses from the cassette
10
when carrying the glasses in the cassette
10
, and handles
16
for convenient carrying the cassette
10
. In operation, a user loads the glasses on the cassette
10
by inserting the glasses in the slots
15
of the side plates
11
. After loading the glasses on the cassette
10
, the user carries the cassette
10
with maintaining the front side of the cassette
10
to be a little up in order to preventing the sliding away of the glasses from the cassette via the front side of the cassette
10
. It is because the conventional cassette
10
has no element for blocking the sliding away of the glasses via the front side of the cassette
10
. Accordingly, if the cassette
10
leans to the front side, the glasses loaded on the cassette
10
may slide down and fall off from the cassette
10
and may be broken. Therefore, the user should pay attention to prevent the leaning of the cassette
10
to the front side when carrying the cassette
10
. In addition, since the conventional cassette supports only the edges of glasses with the protrusions
15
′ having short length, the central parts of the glasses is bent due to their weight.
FIG. 4
shows the bent glasses
17
loaded on the conventional cassette
10
, and the extent of bending of the glasses
17
having various sizes and thicknesses were measured and listed in the following table 1.
TABLE 1
Unit: mm
SIZE OF
THICKNESS OF
EXTENT OF
GLASS (mm
2
)
GLASS
BENDING
370
1.1
1.15
550
1.1
3.3 
550
0.7
9.05
As shown in table 1, in case of the widely used liquid crystal display which is slim and of big size, the extent of bending is large, and it deteriorates the quality of the device.
In addition, the conventional cassette does not effectively eliminate the static electricity generated on the glasses when the glasses are loaded on the cassette.
FIGS. 5A and 5B
are the figures to show the parts of the glass where the electricity generated.
FIG. 5A
shows the front view of the glass and
FIG. 5B
shows the top view of the glass. The measured voltages due to static electricity according to the parts of the glass are shown in the following table 2. These values are measured 2 days after loading the glasses on the conventional cassette.
TABLE 2
UNIT: kV
POSITION
A, a
B, b
C, c
EDGE OF GLASS
0.58
1.72
0.52
SURFACE OF GLASS
0.27
0.45
0.28
Even though the measured value of the static electricity may vary due to the conditions of measurements, it is clearly shown in table 2 that the static electricity generated on parts b and B in
FIGS. 5A and 5B
has higher values than those on the parts a, A and C, c of the glass. It means that the central part and the front side of the glass which may be easily in contact with the materials charged with electricity would have higher electricity. The static electricity is increased by the contact of the glass with a human body or other facilities. Table 3 shows that the variation of the static electricity of part B of
FIG. 5B
before and after the contact of the glass with the human body.
TABLE 3
UNIT: kV
TIME
10 min
20 min
30 min
BEFORE THE CONTACT
0.45
0.45
0.45
AFTER THE CONTACT
0.58
0.78
0.65
Generally, it is known that the static electricity generated on the glass and the slot of the cassette has the value between 200V and 2980V.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a cassette for loading glasses capable of preventing the bending phenomena of the glasses due to their weights. Another object of the present invention is to provide a cassette for loading glasses capable of discharging the static electricity generated on the glasses and the cassette. A further object of the present invention is to provide a cassette for loading glasses for preventing the drifting away of the glasses via the front side of the cassette.
According to the present invention, the cassette includes a plurality of side plates which are parallel to each other and have a plurality of slots formed of first protrusions for loading the glasses therein. A top plate is combined with first ends of said side plates and a bottom plate is combined with second ends of said side plates. In addition, a plurality of supporting bars extend horizontally from the side plates to support the glasses. In the embodiment, the cassette further includes at least one post which is combined with the top plate and the bottom plate to prevent drifting away of the glasses from the cassette.
In accordance with another embodiment of the present invention, a blocker is provided, which is combined with the front side plates. The blocker has a plurality of second protrusions which are placed near the first protrusions and located at higher position to prevent drifting away of the glasses via the front side of the cassette.
In accordance with a further embodiment of the present invention, the side plates, the top plate, the bottom plate and the supporting bars of the cassette are electrically connected through an electrical conductor.


REFERENCES:
patent: 1211269 (1917-01-01), Abbott
patent: 4574959 (1986-03-01), Hollett
patent: 5219079 (1993-06-01), Nakamura
patent: 5393226 (1995-02-01), Groom
patent: 5584401 (1996-12-01), Yoshida
patent: 2613163 (1977-10-01), None
patent: 54-92350 (1952-11-01), None
patent: 1-265534 (1989-10-01), None
patent: 5-147680 (1993-06-01), None
patent: 5-267202 (1993-10-01), None
patent: 6-40481 (1994-02-01), None
patent: 8-88266 (1996-04-01), None
patent: 8-195352 (1996-07-01), None

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