JP2618791B2 - Liquid crystal display cooling device - Google Patents
Liquid crystal display cooling deviceInfo
- Publication number
- JP2618791B2 JP2618791B2 JP4238192A JP23819292A JP2618791B2 JP 2618791 B2 JP2618791 B2 JP 2618791B2 JP 4238192 A JP4238192 A JP 4238192A JP 23819292 A JP23819292 A JP 23819292A JP 2618791 B2 JP2618791 B2 JP 2618791B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal cell
- crystal display
- temperature
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 73
- 238000001816 cooling Methods 0.000 title claims description 33
- 210000002858 crystal cell Anatomy 0.000 claims description 49
- 238000007664 blowing Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Projection Apparatus (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Liquid Crystal (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、光源部（以
下、投影ランプという）からスクリーンへ向かう光路内
に透過型液晶表示パネルが配置され、画像が表示された
液晶パネルに光を通してその画像をスクリーンへ拡大投
影するオーバーヘッドプロジェクタ等に使用され、投影
ランプからの熱により透過型液晶表示パネルの液晶セル
が温度上昇するのを防止するようにした液晶表示装置の
冷却装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a transmission type liquid crystal display panel disposed in an optical path from a light source unit (hereinafter, referred to as a projection lamp) to a screen, and transmitting light through the liquid crystal panel on which an image is displayed. The present invention relates to a cooling device for a liquid crystal display device, which is used in an overhead projector or the like for enlarging and projecting an image on a screen and prevents the temperature of liquid crystal cells of a transmissive liquid crystal display panel from rising due to heat from a projection lamp.
【０００２】[0002]
【従来の技術】オーバーヘッドプロジェクタに使用され
る液晶表示パネルにおける液晶セルは、投影ランプから
発せられる光に含まれる熱によりその温度が上昇する。
そして、その温度上昇がある温度以上になると、液晶セ
ルはコントラストの低下や色むらの発生により投影性能
が大きく劣化し、さらには、液晶セル自体の寿命を著し
く短縮させることになる。2. Description of the Related Art The temperature of a liquid crystal cell in a liquid crystal display panel used in an overhead projector rises due to the heat contained in the light emitted from a projection lamp.
When the temperature rise exceeds a certain temperature, the projection performance of the liquid crystal cell is greatly deteriorated due to a decrease in contrast and color unevenness, and the life of the liquid crystal cell itself is significantly shortened.
【０００３】これに対し、特公平４−２１１６９号公報
に見られるように、従来、液晶表示装置を強制空冷し
て、温度上昇を防止するようにしたものもある。On the other hand, as disclosed in Japanese Patent Publication No. Hei 4-21169, there is a conventional liquid crystal display device which is forcibly air-cooled to prevent a temperature rise.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記公
報に記載されたものは、常に一定の風量を送って冷却す
るものであるから、実際には冷却能力に限界がある。つ
まり、オーバーヘッドプロジェクタ用液晶表示装置のよ
うに光を通過させるものでは、その光線中に含まれる相
当な熱量に曝され、その曝される熱量によって温度上昇
も大きく異なってくる。その温度上昇に対し、常に一定
値以下の温度を保持するためには、冷却風量を常に多く
しておく必要があり、従って、送風ノイズが非常に大き
くなるという問題が生じる。また、必要以上のパワーで
送風するので、電力消費も増加するという問題があっ
た。However, since the one described in the above publication constantly cools by feeding a constant air volume, the cooling capacity is actually limited. That is, in a liquid crystal display device for an overhead projector that allows light to pass therethrough, it is exposed to a considerable amount of heat contained in the light beam, and the temperature rise greatly changes depending on the amount of heat that is exposed. In order to always maintain a temperature equal to or lower than a certain value with respect to the temperature rise, it is necessary to always increase the amount of cooling air, so that there is a problem that the blowing noise becomes extremely large. Further, since the air is blown with more power than necessary, there is a problem that power consumption also increases.
【０００５】そこで、液晶表示体の温度を検出する温度
センサーを設け、温度が上昇した場合ファンに加える電
圧を変化させるようにして、温度が上昇していないとき
にはパワーを低く抑えるようにした液晶表示体の冷却機
構も提案されている（例えば実開平２−８１５２７号公
報参照）。Therefore, a liquid crystal display in which a temperature sensor for detecting the temperature of the liquid crystal display is provided so that the voltage applied to the fan is changed when the temperature rises and the power is kept low when the temperature does not rise A body cooling mechanism has also been proposed (for example, see Japanese Utility Model Laid-Open No. 2-81527).
【０００６】本発明は、上記従来技術に、さらに、画像
情報に基づいたキメ細かな温度制御を併せて行い、温度
上昇の予測や風量の決定を行うようにした液晶表示装置
の冷却装置を提供することを目的とする。The present invention further provides a cooling device for a liquid crystal display device in which the above-mentioned conventional technique is further combined with fine temperature control based on image information to predict the temperature rise and determine the air volume. The purpose is to do.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
に、本発明は、透過型液晶表示パネルの液晶セルと、該
液晶セルを保護するように前記液晶セルの上面に接する
か、若しくは近接して配置された透明な上側保護パネル
及び前記液晶セルの下面とは所要の空間を介して配置さ
れた透明な下側保護パネルと、前記液晶セルの下面の温
度を検出する温度検出器と、前記空間を通風路としその
通風路に冷却風を送る送風手段と、前記温度検出器の検
出結果に応じて冷却風の風量を調節するように前記送風
手段を制御する制御手段とを備えた液晶表示装置の冷却
装置において、前記液晶セルが全面不透過あるいは予め
定められた面積以上の不透過の画像面になったとき、冷
却風の風量を増加するように前記送風手段を制御する制
御手段をさらに設けた構成とするものである。In order to achieve this object, the present invention relates to a liquid crystal cell of a transmissive liquid crystal display panel, which is in contact with or close to the upper surface of the liquid crystal cell so as to protect the liquid crystal cell. A transparent upper protection panel and a lower surface of the liquid crystal cell arranged in a transparent lower protection panel disposed through a required space, a temperature detector for detecting the temperature of the lower surface of the liquid crystal cell, A liquid crystal comprising: a ventilation unit configured to use the space as a ventilation path and sending cooling air to the ventilation path; and a control unit configured to control the ventilation unit to adjust an amount of the cooling air in accordance with a detection result of the temperature detector. In the cooling device of the display device, when the liquid crystal cell is entirely opaque or has an opaque image surface having a predetermined area or more, the control unit controls the blowing unit to increase the amount of cooling air. In addition, Was one in which a structure.
【０００８】[0008]
【作用】上記構成によれば、液晶セルの温度上昇に応じ
た冷却風の供給とともに、液晶セルの表示状態によって
も冷却風量の制御を行うので、温度上昇を予測し、液晶
セルの急激な温度上昇を未然に防止して、常に最適な冷
却効果を得ることができる。According to the above structure, the cooling air is supplied according to the temperature rise of the liquid crystal cell, and the cooling air volume is controlled depending on the display state of the liquid crystal cell. The rise can be prevented beforehand, and the optimum cooling effect can always be obtained.
【０００９】[0009]
【実施例】以下、図面を参照して実施例を詳細に説明す
る。図３は、本発明が適用されるオーバーヘッドブロジ
ェクタ（以下ＯＨＰと略記する）の外観を示したもの
で、１はＯＨＰ本体であり、図示しない投影ランプやフ
レネルレンズ、ＯＨＰ全体を制御する制御部等が内蔵さ
れている。２は透過型の液晶表示パネルであり、拡大投
影しようとする画像を表示する表示画面３を有する。４
は投影レンズ、５は投影ミラーである。Embodiments will be described in detail below with reference to the drawings. FIG. 3 shows an appearance of an overhead projector (hereinafter abbreviated as OHP) to which the present invention is applied. Reference numeral 1 denotes an OHP main body, a projection lamp (not shown), a Fresnel lens, and a control unit for controlling the entire OHP. And so on. A transmissive liquid crystal display panel 2 has a display screen 3 for displaying an image to be enlarged and projected. 4
Is a projection lens, and 5 is a projection mirror.
【００１０】このように構成されたＯＨＰでは、画像を
表示画面３に表示し、下から投影ランプの光を透過させ
ることにより、その画像が投影レンズ４及び投影ミラー
５を介して図示しないスクリーンへ拡大投影される。In the OHP configured as described above, an image is displayed on the display screen 3 and light from a projection lamp is transmitted from below, so that the image is transmitted to a screen (not shown) via the projection lens 4 and the projection mirror 5. Enlarged and projected.
【００１１】図１は、本発明の一実施例を示したもの
で、１１は液晶パネル２の液晶セルであり、周知のよう
に、透明電極をそれぞれ設けた２枚の電極パネルの間に
液晶を封入して構成されている。１２は、液晶セル１１
を保護するように液晶セルの上面に接するか、若しくは
近接して配置され、他の任意のフィルム原稿を載置する
コンタクトガラスを兼ねた透明な上側保護パネルであ
り、カバー１４により水平に保持されている。１３は液
晶セル１１の下面とは所要の空間を介して配置された透
明な下側保護パネルで、カバー１４により水平に保持さ
れている。１５は液晶セル１１の下面の温度を検出する
温度検出器、１６は前記空間を通風路１７としその通風
路１７に冷却風を送る軸流ファン、１８は、カバー１４
の一部に内蔵され、温度検出器１５の検出結果に応じて
冷却風の風量を調節するように軸流ファン１６を制御す
る制御回路である。なお、１９は、制御回路１８と同様
にカバー１４の一部に内蔵され、液晶セル１１を駆動す
る駆動回路である。FIG. 1 shows an embodiment of the present invention. Reference numeral 11 denotes a liquid crystal cell of a liquid crystal panel 2, and as is well known, a liquid crystal is provided between two electrode panels each provided with a transparent electrode. Is enclosed. 12 is a liquid crystal cell 11
Is a transparent upper protective panel which is placed in contact with or close to the upper surface of the liquid crystal cell so as to protect the liquid crystal cell and also serves as a contact glass on which another arbitrary film original is placed, and is held horizontally by the cover 14. ing. Reference numeral 13 denotes a transparent lower protection panel which is arranged with a lower surface of the liquid crystal cell 11 through a required space, and is horizontally held by a cover 14. Reference numeral 15 denotes a temperature detector for detecting the temperature of the lower surface of the liquid crystal cell 11, reference numeral 16 denotes an axial flow fan which defines the space as a ventilation path 17 and sends cooling air to the ventilation path 17, and reference numeral 18 denotes a cover 14.
Is a control circuit which is built in a part of the above and controls the axial fan 16 so as to adjust the air volume of the cooling air according to the detection result of the temperature detector 15. Reference numeral 19 denotes a drive circuit which is built in a part of the cover 14 and drives the liquid crystal cell 11 similarly to the control circuit 18.
【００１２】図２は、上記構成をブロック図で示したも
のである。ここで、さらに、液晶セルの表示状態によっ
ても冷却風量を制御する制御部２５が設けられたもので
ある。FIG. 2 is a block diagram showing the above configuration. Here, a control unit 25 for controlling the cooling air volume depending on the display state of the liquid crystal cell is further provided.
【００１３】次に、本実施例の動作を説明する。投影す
る画像を液晶セル１１に表示させ、下から投影ランプの
光２０を照射すると、画像に対応した透過光が投影レン
ズ４及び投影ミラー５を介してスクリーンへ投影され、
画像が拡大表示される。Next, the operation of this embodiment will be described. When the image to be projected is displayed on the liquid crystal cell 11 and the light 20 of the projection lamp is irradiated from below, the transmitted light corresponding to the image is projected on the screen via the projection lens 4 and the projection mirror 5.
The image is enlarged.
【００１４】液晶セル１１が投影ランプの光に含まれる
熱に曝されると、次第に温度が上昇し、温度検出器１５
が液晶セル１１の温度を検出してその検出信号を制御回
路１８に送る。制御回路１８は、軸流ファン１６を回転
駆動し、通風路１７に風の流れを発生させる。通風路１
７内の空気流は、空気吸入口１７ａから導入され、液晶
セル１１の下面に接して熱を奪い、吐出口１７ｂから外
部へ吐き出される。When the liquid crystal cell 11 is exposed to the heat contained in the light of the projection lamp, the temperature gradually rises and the temperature detector 15
Detects the temperature of the liquid crystal cell 11 and sends a detection signal to the control circuit 18. The control circuit 18 rotationally drives the axial fan 16 to generate a wind flow in the ventilation passage 17. Ventilation path 1
The air flow in 7 is introduced from the air suction port 17a, contacts the lower surface of the liquid crystal cell 11 to take heat, and is discharged to the outside from the discharge port 17b.
【００１５】制御回路１８は、温度検出器１５が検出す
る液晶セル１１の温度に対応して冷却風の風量を調節す
るように軸流ファン１６を制御する。従って、液晶セル
１１の温度が予め定められた設定温度以下のときは軸流
ファン１６を動作させず、設定温度に達した時点で駆動
を開始し、それ以降は、温度に応じて風量を変え、冷却
作用を高めるようにする。また、投影終了後は、冷却動
作を継続するが、液晶セル１１の温度が設定温度以下に
下がったときは軸流ファン１６の駆動を停止させる、と
いった動作も行なわせることができる。The control circuit 18 controls the axial fan 16 so as to adjust the amount of cooling air in accordance with the temperature of the liquid crystal cell 11 detected by the temperature detector 15. Therefore, when the temperature of the liquid crystal cell 11 is equal to or lower than the predetermined set temperature, the axial fan 16 is not operated, and when the temperature reaches the set temperature, the drive is started. Thereafter, the air flow is changed according to the temperature. , To enhance the cooling action. Further, after the projection is finished, the cooling operation is continued, but when the temperature of the liquid crystal cell 11 drops below the set temperature, the operation of the axial fan 16 can be stopped.
【００１６】ここで、本発明では、液晶セルの表示状態
によっても冷却風量を制御する構成となっている。投影
中の液晶セル１１が全面不透過あるいは予め定められた
面積以上の不透過の画像面になったときは、投影光に含
まれる大部分の熱も液晶セルに吸収され、液晶セルが急
激な温度上昇を招くことになる。そこで、パソコン等２
４より液晶セル１１の駆動回路１９に送られる画像デー
タを制御部２５で読み取り、液晶セル１１が全面不透過
あるいは予め定められた面積以上の不透過の画像面にな
る場合は、制御回路１８に信号を送り、軸流ファン１６
からの風量を増加させ、冷却作用を強めるようにする。
これにより、液晶セルの急激な温度上昇を防止し、安全
温度を維持することができる。Here, according to the present invention, the amount of cooling air is controlled according to the display state of the liquid crystal cell. When the liquid crystal cell 11 during projection becomes entirely opaque or has an opaque image surface larger than a predetermined area, most of the heat contained in the projection light is also absorbed by the liquid crystal cell, and the liquid crystal cell is rapidly cooled. This will lead to a rise in temperature. So, PC 2
The image data sent to the drive circuit 19 of the liquid crystal cell 11 from No. 4 is read by the control unit 25, and when the liquid crystal cell 11 has an opaque image surface of the entire surface or an opaque area larger than a predetermined area, the control circuit 18 Send a signal to the axial fan 16
Increase the amount of air from to increase the cooling effect.
As a result, it is possible to prevent a rapid temperature rise of the liquid crystal cell and maintain a safe temperature.
【００１７】ＯＨＰの場合、使用する投影ランプの種類
によっても発熱量が異なる。そこで、従来のように、投
影開始時点から一様の強さの冷却風を送るのではなく、
液晶セルの温度や液晶セルの表示状態に応じて風量を変
えるようにすれば、発熱量の小さい投影ランプの場合、
あるいは液晶セルの温度が比較的低い時点では、風量を
少なくして冷却ノイズを抑制し、さらには省電力化に寄
与することができ、発熱量の大きい投影ランプの場合、
あるいは液晶セルの温度が比較的高くなると、風量を増
加させて冷却を重視した運用が可能になる。In the case of the OHP, the amount of heat generated differs depending on the type of the projection lamp used. Therefore, unlike the conventional method, instead of sending cooling air of uniform strength from the start of projection,
By changing the air flow according to the temperature of the liquid crystal cell and the display state of the liquid crystal cell, in the case of a projection lamp with a small heat value,
Alternatively, when the temperature of the liquid crystal cell is relatively low, the amount of air flow can be reduced to suppress cooling noise, and further contribute to power saving.
Alternatively, when the temperature of the liquid crystal cell becomes relatively high, it becomes possible to increase the amount of airflow and operate with a focus on cooling.
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
液晶セルの温度を検出し、その温度に応じて冷却風量を
制御するので、温度の低いときは風量も少なく、従っ
て、送風ノイズを小さく抑えることができると共に、不
必要な送風を行なうこともなく、省電力化に寄与するこ
とができる。As described above, according to the present invention,
Since the temperature of the liquid crystal cell is detected and the cooling air volume is controlled in accordance with the temperature, the air volume is small when the temperature is low, and therefore, it is possible to suppress the air blowing noise and to prevent unnecessary air blowing. It can contribute to power saving.
【００１９】さらに、液晶セルの表示画面が光の全面不
透過あるいは予め定められた面積以上の不透過の画像面
になる場合、温度検出とは別個に送風手段を制御して風
量を増加させ、冷却作用を強めるようにするので、液晶
セルの急激な温度上昇を防止し、安全温度を維持するこ
とができる。Further, when the display screen of the liquid crystal cell has an image surface which is entirely opaque to light or opaque to a predetermined area or more, the air volume is increased by controlling the air blowing means separately from the temperature detection. Since the cooling action is strengthened, it is possible to prevent a rapid temperature rise of the liquid crystal cell and maintain the safe temperature.
【００２０】そして、液晶セルの温度に応じて適切な冷
却を行なうので、投影品質を維持し、かつ液晶セルの劣
化を防止することができる。Since the cooling is appropriately performed according to the temperature of the liquid crystal cell, the projection quality can be maintained and the deterioration of the liquid crystal cell can be prevented.
【図１】本発明の一実施例の断面図である。FIG. 1 is a sectional view of one embodiment of the present invention.
【図２】本発明の実施例の制御系を含むブロック図であ
る。FIG. 2 is a block diagram including a control system according to the embodiment of the present invention.
【図３】本発明が適用されるＯＨＰの外観図である。FIG. 3 is an external view of an OHP to which the present invention is applied.
２…液晶表示パネル、１１…液晶セル、１２…上側保護
パネル、１３…下側保護パネル、１５…温度検出器、１
６…軸流ファン、１７…通風路、１８…制御回路、１９
…駆動回路、２５…制御部。2 ... Liquid crystal display panel, 11 ... Liquid crystal cell, 12 ... Upper protection panel, 13 ... Lower protection panel, 15 ... Temperature detector, 1
6 ... Axial fan, 17 ... Ventilation path, 18 ... Control circuit, 19
... drive circuit, 25 ... control unit.
Claims (2)
液晶セルを保護するように前記液晶セルの上面に接する
か、若しくは近接して配置された透明な上側保護パネル
及び前記液晶セルの下面とは所要の空間を介して配置さ
れた透明な下側保護パネルと、前記液晶セルの下面の温
度を検出する温度検出器と、前記空間を通風路としその
通風路に冷却風を送る送風手段と、前記温度検出器の検
出結果に応じて冷却風の風量を調節するように前記送風
手段を制御する制御手段とを備えた液晶表示装置の冷却
装置において、 前記液晶セルが全面不透過あるいは予め定められた面積
以上の不透過の画像面になったとき、冷却風の風量を増
加するように前記送風手段を制御する制御手段をさらに
設けたことを特徴とする液晶表示装置の冷却装置。1. A liquid crystal cell of a transmissive liquid crystal display panel, a transparent upper protective panel disposed in contact with or close to the upper surface of the liquid crystal cell so as to protect the liquid crystal cell, and a lower surface of the liquid crystal cell. Is a transparent lower protection panel arranged through a required space, a temperature detector for detecting the temperature of the lower surface of the liquid crystal cell, and a blowing means for sending cooling air to the air passage as the air passage. In the cooling device of the liquid crystal display device, which includes a control unit that controls the air blowing unit to adjust the air volume of the cooling air according to the detection result of the temperature detector, A cooling device for a liquid crystal display device, further comprising control means for controlling the air blowing means so as to increase the air volume of the cooling air when the image surface becomes opaque over a predetermined area.
が光源部からスクリーンへ向かう光路内に配置されたオ
ーバーヘッドプロジェクタ用液晶表示装置であることを
特徴とする請求項１記載の液晶表示装置の冷却装置。2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device for an overhead projector in which a transmission type liquid crystal display panel is arranged in an optical path from a light source unit to a screen. Cooling system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4238192A JP2618791B2 (en) | 1992-09-07 | 1992-09-07 | Liquid crystal display cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4238192A JP2618791B2 (en) | 1992-09-07 | 1992-09-07 | Liquid crystal display cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0682745A JPH0682745A (en) | 1994-03-25 |
| JP2618791B2 true JP2618791B2 (en) | 1997-06-11 |
Family
ID=17026530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4238192A Expired - Fee Related JP2618791B2 (en) | 1992-09-07 | 1992-09-07 | Liquid crystal display cooling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618791B2 (en) |
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|---|---|---|---|---|
| US5709463A (en) * | 1996-08-13 | 1998-01-20 | Delco Electronics Corporation | Backlighting for bright liquid crystal display |
| NZ526028A (en) * | 2003-05-21 | 2006-02-24 | Pure Depth Ltd | Backlighting system for display screen utilised to control the distribution of power to at least one light source |
| US8854595B2 (en) | 2008-03-03 | 2014-10-07 | Manufacturing Resources International, Inc. | Constricted convection cooling system for an electronic display |
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| US8749749B2 (en) | 2008-12-18 | 2014-06-10 | Manufacturing Resources International, Inc. | System for cooling an electronic image assembly with manifolds and ambient gas |
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| US10602626B2 (en) | 2018-07-30 | 2020-03-24 | Manufacturing Resources International, Inc. | Housing assembly for an integrated display unit |
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| US10795413B1 (en) | 2019-04-03 | 2020-10-06 | Manufacturing Resources International, Inc. | Electronic display assembly with a channel for ambient air in an access panel |
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| US11966263B2 (en) | 2021-07-28 | 2024-04-23 | Manufacturing Resources International, Inc. | Display assemblies for providing compressive forces at electronic display layers |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0281527U (en) * | 1988-12-08 | 1990-06-22 | ||
| JPH0460534A (en) * | 1990-06-29 | 1992-02-26 | Sharp Corp | Air flow system of liquid crystal projector |
-
1992
- 1992-09-07 JP JP4238192A patent/JP2618791B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0682745A (en) | 1994-03-25 |
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