Coating apparatus – With means to centrifuge work
Reexamination Certificate
1999-05-25
2001-08-21
Edwards, Laura (Department: 1734)
Coating apparatus
With means to centrifuge work
C118S056000, C118S319000, C118S320000, C118S500000, C118S503000
Reexamination Certificate
active
06277195
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a torque transmission apparatus made up of a reduced number of structural parts, an apparatus for forming a panel surface film of a cathode ray tube and employing the torque transmission apparatus, and a unit for forming panel surface films of cathode ray tubes.
BACKGROUND ART
In general, a rotation apparatus, generally referred to as a spin head, is employed for forming the panel surface film of a cathode ray tube. A plan view of the rotation apparatus is shown in
FIG. 1A
, and a front view thereof is shown in FIG.
1
B. As shown in
FIGS. 1A and 1B
, the rotation apparatus comprises: a discoid faceplate
2
for holding the periphery of the panel of a cathode ray tube
1
fitted therein in such a manner that the cathode ray tube
1
is directed downward; and a plurality of support rollers (e.g., four rollers)
3
a
,
3
b
,
3
c
and
3
d
arranged at regular intervals around the faceplate
2
. The faceplate
2
is rotatably supported by the support rollers
3
a
,
3
b
,
3
c
and
3
d
. A rotating roller
4
, which is coupled to a driving motor
6
through a gear mechanism
5
, is in contact with the outer circumference of the faceplate
2
. The faceplate
2
is rotated at high speed by means of the gear mechanism
5
and the rotating roller
4
when the driving motor
6
is actuated.
In this type of rotation apparatus, however, the support rollers
3
a
,
3
b
,
3
d
and
3
d
and the driving roller
4
are in contact with the outer circumference of the faceplate
2
. In addition, the driving roller
4
is coupled to the driving motor
6
through the gear mechanism
5
. Therefore, when the faceplate
2
is rotated at high speed, the rotation apparatus makes a loud noise. In the case of a panel surface film formation apparatus comprising dozen or so rotation apparatuses, the level of the noise made will be as high as 96 phons, and a solution to this problem is thus desired.
Since the support rollers
3
a
,
3
b
,
3
c
and
3
d
and the driving roller
4
are kept in contact with the outer circumference of the faceplate
2
, they may be abraded very much due to the rotation, and may become eccentric. In addition, since dust is caused by the abrasion, maintenance is troublesome.
As described above, the conventional rotation apparatus, wherein the faceplate is supported by means of support rollers that are in contact with the outer circumference of the faceplate and is rotated by the driving roller that are also in contact with that outer circumference, has problems in terms of the high-level noise it makes, the eccentricity due to abrasion, the generation of dust, etc.
The present invention has been made in consideration of the above circumstances, and one object of the invention is to provide a torque transmission apparatus which suppresses the noise and abrasion and is of a simple structure.
Another object of the present invention is to provide an apparatus adapted for forming a panel surface film of a cathode ray tube and employing a torque transmission apparatus which suppresses the noise and abrasion and is of a simple structure.
A still another object of the present invention is to provide an apparatus adapted for forming a panel surface film of a cathode ray tube and employing a plurality of torque transmission apparatuses each of which suppresses the noise and abrasion and is of a simple structure.
DISCLOSURE OF INVENTION
According to the present invention, there is provided a torque transmission apparatus comprising:
a bearing, supported on a stationary structural member, for rotatably supporting a body to be rotated; and
a torque transmission, coupled to a torque source, for transmitting torque of the torque source to the body through the bearing;
the bearing including:
an annual outer member having a circular inner shape;
an annual inner member rotatably fitted within the outer member and having a circular outer shape;
rolling elements arranged between the outer member and the inner member;
a coupling section which is formed on one of the outer and inner members and to which the body to be rotated is coupled; and
a fixing section which is formed on another one of the outer and inner members and which is fixed to the stationary structural member.
The present invention also provides an apparatus for forming a panel surface film (an antireflection film) of a cathode ray tube, comprising:
a faceplate having an opening for supporting the cathode ray tube such that the panel surface of the cathode ray tube is exposed when inserted in the opening and is directed downward;
a base member;
a bearing, provided for the base member, for rotatably supporting the faceplate; and
a torque transmission mechanism, coupled to a torque source, for transmitting torque of the torque source to the faceplate through the bearing;
the bearing including:
an outer ring having a circular inner shape;
an inner ring rotatably fitted within the outer ring and having a circular outer shape;
rolling elements arranged between the outer ring and the inner ring;
a coupling section which is formed on one of the outer and inner rings and to which the faceplate is coupled; and
a fixing section which is formed on another one of the outer and inner rings and which is fixed to the base member.
The present invention further provides a formation unit for forming panel surface films of cathode ray tubes, comprising:
a plurality of formation apparatuses, arranged at different positions, for forming the panel surface films of the cathode ray tubes;
a mechanism for moving a cathode ray tube to a panel surface film formation apparatus at a first position;
a mechanism, located at a second position, for coating a panel surface film-forming solution;
a mechanism, located at a third position, for drying a coating of the panel surface film-forming solution; and
a mechanism for sequentially moving the panel surface film-forming apparatuses from the first position to the second position and from the second position to the third position,
each of the apparatuses for forming the panel surface films of the cathode ray tubes including:
a faceplate having an opening for supporting the cathode ray tube such that the panel surface of the cathode ray tube is exposed when inserted in the opening and is directed downward;
a base member;
a bearing, provided for the base member, for rotatably supporting the faceplate; and
a torque transmission mechanism, coupled to a torque source, for transmitting torque of the torque source to the faceplate through the bearing;
the bearing including:
an outer ring having a circular inner shape;
an inner ring rotatably fitted within the outer ring;
rolling elements arranged between the outer ring and the inner ring;
a coupling section which is formed on one of the outer and inner rings and to which the faceplate is coupled; and
a fixing section which is formed on another one of the outer and inner members and which is fixed to the base member.
REFERENCES:
patent: 3672932 (1972-06-01), D'Augustine
patent: 3701674 (1972-10-01), Kimbrough
patent: 3791846 (1974-02-01), Nuehring
patent: 3824955 (1974-07-01), Marks et al.
patent: 6-66817 (1994-03-01), None
patent: 7-63947 (1995-07-01), None
Iijima Hisashi
Takeda Hitoshi
Edwards Laura
Kabushiki Kaisha Toshiba
Pillsbury & Winthrop LLP
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