Information
-
Patent Grant
-
6686683
-
Patent Number
6,686,683
-
Date Filed
Friday, May 16, 200321 years ago
-
Date Issued
Tuesday, February 3, 200420 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 313 402
- 313 404
- 313 407
- 313 269
-
International Classifications
-
Abstract
A vibration damping member penetrates through two mounting apertures provided in a shadow mask with tension applied thereto, so as to be attached to the shadow mask in a freely movable state. The vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures and a bridge portion linking these portions. A protrusion protruding toward the shadow mask is provided in the bridge portion of the vibration damping member. This configuration regulates a tilted angle of the vibration damping member with respect to the face of the shadow mask, thus preventing a phenomenon in which a bending portion is caught by the edge of the mounting aperture so that the vibration damping member is pinned by the shadow mask. As a result, the freely movable state of the vibration damping member can be kept always, and therefore vibrations of the shadow mask can be dampened effectively and a color cathode ray tube with reduced color displacement can be provided.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a color cathode ray tube used for a television receiver and a computer display.
2. Related Background Art
In recent years, in order to reduce reflections and provide a good appearance, a color cathode ray tube having a substantially flat face panel for displaying an image is becoming mainstream. Following this, a shadow mask that is disposed inside of the tube so as to oppose an inner face of the face panel tends to be supported in a state closer to a flat form than before. As the supporting method, a tension method is known in which a shadow mask is welded and fixed to a frame while applying tension to the shadow mask.
In the color cathode ray tube employing the tension method, various measures are taken for preventing color displacement generated due to vibration of the shadow mask, which is caused by the transmission of vibration of a speaker or the like. For example, JP 2001-101978 A discloses a technology for attaching a vibration damping member, which is formed in a frame form by bending, to a shadow mask so that the vibration damping member can move freely.
According to this technology, when the shadow mask vibrates, the vibration damping member moves independently of the shadow mask. As a result, the vibration energy of the shadow mask is converted into a friction energy between the vibration damping member and the shadow mask to be consumed, thus dampening the vibrations of the shadow mask. Also, such a vibration damping member can be formed easily and accurately.
However, the frame-form vibration damping member described in this prior art has the following problem: this vibration damping member exerts remarkable effects for suppressing the vibrations of the shadow mask if the vibration damping member always can be kept in a freely movable state. In this respect, as shown in
FIG. 11
, a bending portion
32
a
or
32
b
of a vibration damping member
31
tends to be caught by the edge of a mounting aperture
33
in the shadow mask
5
, and once the vibration damping member
31
is caught so as to be pinned (i.e., latched and fixed) by the shadow mask
5
, then it becomes impossible for the vibration damping member
31
to return to a freely movable state. This means that the effective vibration damping for the shadow mask
5
may not be achieved.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind, it is an object of the present invention to provide a color cathode ray tube in which vibration of a shadow mask is dampened effectively by providing the color cathode ray tube with a vibration damping member attached so as to always keep a freely movable state.
In order to fulfill the above-stated object, a color cathode ray tube of the present invention has the following configurations.
That is, a color cathode ray tube according to the present invention includes: a shadow mask held in a state of tension applied thereto; two mounting apertures provided in the shadow mask or a different member attached to the shadow mask, the different member vibrating following vibration of the shadow mask; and a vibration damping member penetrating through the two mounting apertures to be attached in a freely movable state to the shadow mask or the different member, the vibration damping member dampening vibrations of the shadow mask.
In a first color cathode ray tube of the present invention, the vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures and a bridge portion linking the two penetrating portions. A protrusion or a swelling portion protruding toward the shadow mask or the different member is provided in the bridge portion.
In a second color cathode ray tube of the present invention, a protrusion or a swelling portion protruding toward the vibration damping member is provided at a region between the two mounting apertures of the shadow mask or the different member.
A third color cathode ray tube of the present invention further includes a member that has an aperture through which the vibration damping member penetrates and is attached in a freely movable state to the vibration damping member.
In a fourth color cathode ray tube of the present invention, the vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures, and the vibration damping member has an asymmetrical shape with respect to a center position between the two penetrating portions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a cross-sectional view showing a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 1 of the present invention.
FIG. 2
is a schematic cross-sectional view of a color cathode ray tube according to one embodiment of the present invention.
FIG. 3
is a perspective view showing an assembled member of a shadow mask of a color cathode ray tube according to one embodiment of the present invention.
FIG. 4
is a cross-sectional view showing another configuration example of a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 1 of the present invention.
FIG. 5
is a cross-sectional view showing a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 2 of the present invention.
FIG. 6
is a cross-sectional view showing a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 3 of the present invention.
FIG. 7
is a cross-sectional view showing another configuration example of a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 3 of the present invention.
FIG. 8
is a cross-sectional view showing still another configuration example of a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 3 of the present invention.
FIG. 9
is a cross-sectional view showing a vibration damping member and a shadow mask in a color cathode ray tube according to Embodiment 4 of the present invention.
FIG. 10A
is a schematic perspective view showing an assembled member of a shadow mask in a color cathode ray tube according to Embodiment 5 of the present invention, and
FIG. 10B
is a partial side view of the shadow mask assembled member in the direction of the arrow
10
B in FIG.
10
A.
FIG. 11
is a cross-sectional view showing a vibration damping member and a shadow mask in the conventional color cathode ray tube.
DETAILED DESCRIPTION OF THE INVENTION
According to the first through fourth color cathode ray tubes of the present invention, a freely movable state of a vibration damping member always can be maintained. Therefore, vibrations of a shadow mask can be dampened effectively, so that a color cathode ray tube with reduced color displacement can be provided.
The following describes embodiments of the present invention in detail, with reference to the drawings.
FIG. 2
shows one example of the color cathode ray tubes. A color cathode ray tube
1
is provided with an envelope including a panel
2
having a phosphor screen
2
a
formed on its inner surface and a funnel
3
. In a neck portion
3
a
of the funnel
3
, an electron gun
4
is contained. A shadow mask
5
facing the phosphor screen
2
a
is supported by a mask frame
6
, and the mask frame
6
is attached to panel pins (not illustrated) provided on an inner wall of the panel
2
through a spring (not illustrated). Furthermore, in order to deflect and scan an electron beam
7
emitted from the electron gun
4
, a deflection yoke
8
is provided on the outside of the funnel
3
.
FIG. 3
shows one embodiment of an assembled member of the shadow mask
5
and the mask frame
6
of the color cathode ray tube. The mask frame
6
is a rectangular frame member including a pair of long side frames
6
a
and a pair of short side frames
6
b
. The shadow mask
5
having a large number of apertures is welded to the long side frames
6
a
while applying tension to the shadow mask
5
in the direction of an arrow
9
, i.e., in the vertical direction (X-axis direction). At end portions of the shadow mask in the direction perpendicular to the tension applying direction, i.e., in the horizontal direction (Y-axis direction), vibration damping members
10
are attached.
Embodiment 1
FIG. 1
is a detailed partial cross-sectional view showing a state in which a vibration damping member
10
according to Embodiment 1 of the present invention is attached to a shadow mask
5
. The vibration damping member
10
has a bridge portion
13
a
and two penetrating portions
13
b
that are bent with respect to the bridge portion
13
a
at bending portions
12
a
as both ends of the bridge portion
13
a
. After penetrating through two mounting apertures
11
that are provided in the shadow mask
5
, the two penetrating portions
13
b
are bent at bending portions
12
b
toward the side of the bridge portion
13
a
and are bent again at turning portions
12
c
away from the bridge portion
13
a
. Since an outer diameter of the penetrating portions
13
b
is smaller than an aperture diameter of the mounting apertures
11
and a space between the two penetrating portions
13
b
is substantially equal to a space between the two mounting apertures
11
, the vibration damping member
10
is attached to the shadow mask
5
so that the vibration damping member
10
can move freely with respect to the shadow mask
5
. In this invention, “the freely movable state” of the vibration damping member
10
with respect to the shadow mask
5
means a state where, when the shadow mask
5
vibrates, the vibration damping member
10
can repeatedly make movements such as floating, colliding and bouncing with respect to the shadow mask
5
, independently of the vibration of the shadow mask
5
. Accordingly, this state is clearly different from a “fixed” and a “fastened” state in which the vibration damping member
10
cannot make a movement independently of the shadow mask
5
during the vibration of the shadow mask
5
.
The bridge portion
13
a
is provided with two protrusions
14
protruding toward the shadow mask
5
. These protrusions
14
keep the bridge portion
13
a
of the vibration damping member
10
offset (apart) from the shadow mask
5
. This configuration regulates a tilted angle of the vibration damping member
10
with respect to the face of the shadow mask
5
, thus preventing a phenomenon in which the bending portion
12
a
or
12
b
is caught by the edge of the mounting aperture
11
so that the vibration damping member
10
is pinned by the shadow mask
5
.
A specific example of the present invention and its effects will be described below. As an example of the present invention, a wide-screen color cathode ray tube having a diagonal screen size of 76 cm, which employed the tension method, was prepared. In this color cathode ray tube, two vibration damping members
10
were attached at each side of the end portions of the shadow mask
5
in the horizontal direction. Each of the vibration damping members, which were made of SUS 430 with a wire diameter of 0.9 mm, penetrated through mounting apertures
11
with an aperture diameter of 1.4 mm. Referring to
FIG. 1
, a length L
1
of a bridge portion
13
a
was 70 mm, a length L
2
between bending portions
12
a
and
12
b
was 2.5 mm, a height L
3
of the turned portion was 1.0 mm, a height L
4
of protrusions
14
was 0.5 mm and a distance L
5
between the bending portion
12
a
and the center of the protrusion
14
was 7.5 mm. Meanwhile, as a comparative example, a color cathode ray tube having the same size was prepared in which a vibration damping member having the same configuration as that of the above example, except for no protrusions
14
being provided and a bridge portion
13
a
formed in a substantially straight form, was attached to a shadow mask. The dimensions and the attached position in the comparative example were the same as in the above example.
As for these two color cathode ray tubes, at a position slightly displaced toward an edge in the horizontal direction from the midpoint between the center of the screen and the edge, where color displacement due to vibrations becomes more pronounced, (the coordinates of the position is (
280
,
0
) (unit: mm) where the coordinates of the center of the shadow mask is (X, Y)=(
0
,
0
)), the amplitude and the damping time of vibrations of the shadow masks were measured when the sound in a frequency band that makes the shadow masks vibrate the most remarkably (about 160 Hz) was given from a speaker. The results will be shown in Table 1:
TABLE 1
|
|
Maximum amplitude
Damping time
|
[μm]
[sec]
|
|
|
Example of the present
61
2.9
|
invention
|
Comparative example
105
8.8
|
|
From Table 1, it can be seen that the example of the present invention makes the maximum amplitude smaller and the damping time of the amplitude shorter than the comparative example.
Note here that although this embodiment was described referring to
FIG. 1
, which provides the protrusions
14
having a substantially arc shape in the bridge portion
13
a
of the vibration damping member
10
, the shape of the protrusions is not limited to this example, and they may be formed in another shape, such as a triangle and a trapezoidal form. Additionally, the number of the protrusions is not limited to two. Furthermore, as shown in
FIG. 4
, a swelling portion
15
having a certain degree of length may be provided in the bridge portion
13
a
of the vibration damping member
10
. Moreover, the protrusions and the swelling portion need not be formed by deforming the material of the vibration damping member
10
. Instead, they may be formed by attaching a different member to the bridge portion
13
a
of the vibration damping member
10
.
In this embodiment, the bending angle at the bending portion
12
b
may be an angle in such a degree that the vibration damping member
10
would not drop from the shadow mask
5
. However, it is preferable that, as shown in
FIG. 1
, the bending is carried out at the bending portion
12
b
so that a portion
13
c
positioned on the open end side from the bending portion
12
b
forms an acute angle with the penetrating portion
13
b
. With this configuration, the portion
13
c
also serves to regulate the tilted angle of the vibration damping member
10
with respect to the face of the shadow mask
5
, thus further preventing a phenomenon in which the bending portion
12
a
or
12
b
is caught by the edge of the mounting aperture
11
so that the vibration damping member
10
is pinned by the shadow mask
5
.
Embodiment 2
FIG. 5
is a partial cross-sectional view showing Embodiment 2 of the present invention. This embodiment is different from Embodiment 1 in that a device for preventing a vibration damping member
10
from being pinned is provided on a shadow mask
5
. The vibration damping member
10
is attached to the shadow mask
5
in such a manner that the vibration damping member
10
penetrates through two mounting apertures
11
and then are bent. At a region of the shadow mask
5
between the two mounting apertures
11
, protrusions
16
protruding toward a bridge portion
13
a
of the vibration damping member
10
are provided. These protrusions
16
keep the bridge portion
13
a
of the vibration damping member
10
offset from the shadow mask
5
. This configuration regulates a tilted angle of the vibration damping member
10
with respect to the face of the shadow mask
5
, thus preventing a phenomenon in which a bending portion
12
a
or
12
b
is caught by the edge of the mounting aperture
11
so that the vibration damping member
10
is pinned by the shadow mask
5
.
Note here that the shape and the number of the protrusions
16
are not limited especially. In addition, a length of the protrusions
16
along the bridge portion
13
a
may be lengthened so as to form a swelling portion. A method for manufacturing the protrusions
16
and the swelling portion is not limited especially, and they may be formed by attaching a different member to the shadow mask
5
by bonding, welding or the like, or may be formed by deforming the shadow mask
5
by press working or the like.
Embodiment 3
FIG. 6
is a partial cross-sectional view showing Embodiment 3 of the present invention. This embodiment is different from Embodiments 1 and 2 in that a device for preventing a vibration damping member
10
from being pinned is provided as a member different from the vibration damping member
10
and a shadow mask
5
. As shown in
FIG. 6
, after letting two penetrating portions
13
b
respectively penetrate through central openings
18
of two washers (members having an aperture)
17
, the vibration damping member
10
is attached to the shadow mask
5
by penetrating through two mounting apertures
11
provided in the shadow mask
5
in a similar manner to that in Embodiment 1. It is preferable to make a diameter of the openings
18
of the washers
17
smaller than an aperture diameter of the mounting apertures
11
. The washers
17
have an outer diameter and an aperture diameter set so as to be held by not a bridge portion
13
a
of the vibration damping member
10
but the penetrating portions
13
b
. In this way, by attaching the washers
17
to the vibration damping member
10
between the bridge portion
13
a
and the shadow mask
5
so as to overlap with the edges of the mounting apertures
11
, the bridge portion
13
a
of the vibration damping member
10
is kept offset from the shadow mask
5
while maintaining a freely movable state of the vibration damping member
10
. Thereby, a tilted angle of the vibration damping member
10
with respect to the face of the shadow mask
5
is regulated, thus preventing a phenomenon in which the bending portion
12
a
or
12
b
is caught by the edge of the mounting aperture
11
so that the vibration damping member
10
is pinned by the shadow mask
5
.
It is preferable to make the aperture diameter of the openings
18
of the washers
17
larger than the outer diameter of the penetrating portions
13
b
of the vibration damping member
10
. With this configuration, the washers
17
can be attached to the vibration damping member
10
so as to move freely with respect to the vibration damping member
10
. As a result, since the washers
17
also exert a vibration damping function in addition to the vibration damping member, the vibration damping effect for the shadow mask
5
further can be enhanced. In addition, even if the bending portion
12
a
or
12
b
happens to be latched by the edge of the mounting aperture
11
, the vibrations of the washers
17
can help alleviate the latching of the bending portion
12
a
or
12
b
by the edge of the mounting aperture
11
.
As long as the bridge portion
13
a
can be kept offset from the shadow mask
5
, the device provided as a different member for preventing latching and fixing is not limited to the washers
17
of FIG.
6
. For example, as shown in
FIG. 7
, one flat plate
19
may be attached to the vibration damping member
10
in such a manner that a pair of penetrating portions
13
b
respectively penetrate through two openings
19
a
provided in the flat plate
19
and the flat plate
19
is positioned between the bridge portion
13
a
and the shadow mask
5
. In this case also, by appropriately setting an aperture diameter of the pair of openings
19
a
of the flat plate
19
and a space between the openings, the flat plate
19
is attached to the vibration damping member
10
so as to move freely with respect to the vibration damping member
10
.
Alternatively, as shown in
FIG. 8
, a cylindrical hollow pipe
20
may be attached to the bridge portion
13
a
so that the bridge portion
13
a
penetrates through the hollow portion. In this case also, by appropriately setting an aperture diameter of the hollow portion and length of the pipe
20
, the pipe
20
is attached to the vibration damping member
10
so as to move freely with respect to the vibration damping member
10
. Note here that the number of the pipe that is attached to the bridge portion
13
a
is not limited to one, and a plurality of pipes may be attached.
Embodiment 4
FIG. 9
is a partial cross-sectional view showing Embodiment 4 of the present invention. This embodiment is different from Embodiments 1 to 3 in that the vibration damping member
10
has an asymmetrical shape with respect to the center position between a pair of penetrating portions
13
b
. That is to say, on the upper end side of the vibration damping member
10
, one end
21
of a bridge portion
13
a
extends upward beyond the penetrating portion
13
b
, and on the lower end side, a portion
22
on the open end side is bent downward at a bending portion
12
b
. With this configuration, a tilted angle of the vibration damping member
10
with respect to the face of the shadow mask
5
is regulated, thus preventing a phenomenon in which the bending portion
12
a
or
12
b
is caught by the edge of the mounting aperture
11
so that the vibration damping member
10
is pinned by the shadow mask
5
. Furthermore, a barycenter of the vibration damping member
10
is positioned out of the center position between the pair of penetrating portions
13
b
, which activates the motion of the vibration damping member
10
at the time of vibrations of the shadow mask
5
, thus reducing the tendency for the vibration damping member
10
to be pinned by the shadow mask
5
.
Note here that a shape of the vibration damping member
10
in this embodiment is not limited to the shape of
FIG. 9
, as long as it is an asymmetrical shape with respect to the center position between the pair of penetrating portions
13
b.
Embodiment 5
FIG. 10A
is a schematic perspective view showing another example of a shadow mask assembled member to which the vibration damping member
10
according to the present invention is attached, and
FIG. 10B
is a partial side view of the shadow mask assembled member in the direction of the arrow
10
B in FIG.
10
A. This embodiment is different from the shadow mask assembled member shown in
FIG. 3
in that the vibration damping member
10
is attached not to a shadow mask
5
but to a member
51
. This difference will be described below.
As shown in
FIGS. 10A and 10B
, the member
51
is attached to the shadow mask
5
at a region on both outer sides in the horizontal direction, which is outside the region in which apertures through which electron beams pass are formed. As shown in
FIG. 10B
, the member
51
may be made of a strip-form metal plate. Both ends of the member
51
are bent so that a center portion thereof is apart from the shadow mask
5
and the member
51
is welded to the shadow mask
5
only at the both ends. The vibration damping member
10
penetrates through two mounting apertures (not illustrated) formed in the center portion of the member
51
, which is apart from the shadow mask
5
, so as to be attached to the member
51
in a freely movable state. The vibration damping member
10
does not contact with the shadow mask
5
. When the shadow mask
5
vibrates, the member
51
also vibrates following the vibrations. At this time, the vibration damping member
10
functions so as to dampen the vibrations of the member
51
, which also results in the dampening of the vibrations of the shadow mask
5
. The vibration damping member
10
has the same configuration as described in Embodiment 1. Therefore, like Embodiment 1, this configuration can prevent a phenomenon in which the vibration damping member
10
is pinned by the member
51
.
Note here that although
FIGS. 10A and 10B
show an example where the configuration of Embodiment 1 is applied to the member
51
for attaching the vibration damping member
10
, the configurations of Embodiments 2 to 4 also are applicable, and in all cases, the same effects as above can be obtained. In the case of the application of Embodiment 2, the protrusions
16
(or the swelling portion) are provided not on the shadow mask
5
but on the member
51
.
Further, as long as the member different from the shadow mask
5
, to which the vibration damping member
10
is attached, is capable of being attached to the shadow mask
5
and vibrating following the vibrations of the shadow mask
5
, such a member is not limited to the member
51
shown in
FIGS. 10A and 10B
.
Although the above-described Embodiments 1 to 5 deal with examples where two vibration damping members
10
are attached at each of the both end portions of the shadow mask
5
in the horizontal direction, the number and the size of the vibration damping member
10
may be changed as appropriate depending on the size of a color cathode ray tube and a tension distribution on the shadow mask
5
.
Additionally, in the above-described Embodiments 1 to 5, the shape of the openings of the mounting apertures
11
is a circle, but the shape is not limited to this. For instance, at least one of the two mounting apertures corresponding to one vibration damping member
10
may be shaped as an ellipse, which facilitates the attachment of the vibration damping member
10
.
The invention may be embodied in other forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims
- 1. A color cathode ray tube comprising:a shadow mask held in a state of tension applied thereto; two mounting apertures provided in the shadow mask or a different member attached to the shadow mask, the different member vibrating following vibration of the shadow mask; and a vibration damping member penetrating through the two mounting apertures to be attached in a freely movable state to the shadow mask or the different member, the vibration damping member dampening vibration of the shadow mask, wherein the vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures and a bridge portion linking the two penetrating portions, and a protrusion or a swelling portion protruding toward the shadow mask or the different member is provided in the bridge portion.
- 2. The color cathode ray tube according to claim 1, wherein the two mounting apertures are provided in the shadow mask.
- 3. A color cathode ray tube comprising:a shadow mask held in a state of tension applied thereto; two mounting apertures provided in the shadow mask or a different member attached to the shadow mask, the different member vibrating following vibration of the shadow mask; and a vibration damping member penetrating through the two mounting apertures to be attached in a freely movable state to the shadow mask or the different member, the vibration damping member dampening vibration of the shadow mask, wherein a protrusion or a swelling portion protruding toward the vibration damping member is provided at a region between the two mounting apertures of the shadow mask or the different member.
- 4. The color cathode ray tube according to claim 3, wherein the two mounting apertures are provided in the shadow mask.
- 5. A color cathode ray tube comprising:a shadow mask held in a state of tension applied thereto; two mounting apertures provided in the shadow mask or a different member attached to the shadow mask, the different member vibrating following vibration of the shadow mask; a vibration damping member penetrating through the two mounting apertures to be attached in a freely movable state to the shadow mask or the different member, the vibration damping member dampening vibration of the shadow mask; and a member having an aperture through which the vibration damping member penetrates and attached in a freely movable state to the vibration damping member.
- 6. The color cathode ray tube according to claim 5, wherein the two mounting apertures are provided in the shadow mask.
- 7. A color cathode ray tube comprising:a shadow mask held in a state of tension applied thereto; two mounting apertures provided in the shadow mask or a different member attached to the shadow mask, the different member vibrating following vibration of the shadow mask; and a vibration damping member penetrating through the two mounting apertures to be attached in a freely movable state to the shadow mask or the different member, the vibration damping member dampening vibration of the shadow mask, wherein the vibration damping member has two penetrating portions each passing loosely through one of the two mounting apertures, and the vibration damping member has an asymmetrical shape with respect to a center position between the two penetrating portions.
- 8. The color cathode ray tube according to claim 7, wherein the two mounting apertures are provided in the shadow mask.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2002-148703 |
May 2002 |
JP |
|
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
20010002352 |
Mizuta et al. |
May 2001 |
A1 |
Foreign Referenced Citations (3)
Number |
Date |
Country |
1 089 311 |
Apr 2001 |
EP |
2001-101978 |
Apr 2001 |
JP |
2001-155654 |
Jun 2001 |
JP |