JPH0578135B2 - - Google Patents
Info
- Publication number
- JPH0578135B2 JPH0578135B2 JP1991584A JP1991584A JPH0578135B2 JP H0578135 B2 JPH0578135 B2 JP H0578135B2 JP 1991584 A JP1991584 A JP 1991584A JP 1991584 A JP1991584 A JP 1991584A JP H0578135 B2 JPH0578135 B2 JP H0578135B2
- Authority
- JP
- Japan
- Prior art keywords
- panel
- cathode ray
- refrigerant
- ray tube
- complexing agent
- 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 - Lifetime
Links
- 239000003507 refrigerant Substances 0.000 claims description 13
- 239000008139 complexing agent Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/006—Arrangements for eliminating unwanted temperature effects
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、けい光面パネルの前方に枠状の放熱
板を介して透明な前面パネルを固着し、その間に
透明な液状冷媒を封入したいわゆる液冷式の投射
形ブラウン管に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is directed to a so-called so-called solar panel in which a transparent front panel is fixed in front of a fluorescent panel through a frame-shaped heat sink, and a transparent liquid refrigerant is sealed in between. This relates to liquid-cooled projection cathode ray tubes.
投射形ブラウン管は、高輝度画像を得るために
けい光面を刺激発光させる電子ビームのエネルギ
ーを高めていることから、けい光面における発熱
量が大きい。一方、けい光面が形成されているパ
ネルは熱伝導度の比較的低いガラスで形成されて
いるため、けい光面で発生した多量の熱は他部へ
は余り伝導されず、その結果、連続動作時にはパ
ネル中央部の温度は著しく上昇する。そして、こ
の著しい温度上昇は、発光効率に温度依存性を有
するけい光体の輝度低下を招き、またパネル中央
部と周辺部との著しい温度差のために場合によつ
てはパネルにクラツクを発生させることになる。
In projection type cathode ray tubes, the energy of the electron beam that stimulates the phosphor surface to emit light is increased in order to obtain a high-brightness image, so the amount of heat generated at the phosphor surface is large. On the other hand, since the panel on which the fluorescent surface is formed is made of glass with relatively low thermal conductivity, the large amount of heat generated on the fluorescent surface is not conducted to other parts, and as a result, the continuous During operation, the temperature in the center of the panel increases significantly. This significant temperature increase causes a decrease in the brightness of the phosphor, whose luminous efficiency is temperature dependent, and may also cause cracks in the panel due to the significant temperature difference between the center and peripheral areas of the panel. I will let you do it.
このような問題に対処するため、けい光面パネ
ルの外表面を、例えば対流が生ずる液体のような
冷媒で冷却するように構成した投射形ブラウン管
が提案されている。 To address this problem, a projection type cathode ray tube has been proposed in which the outer surface of the phosphor panel is cooled with a coolant such as a liquid that causes convection.
第１図に従来から用いられているこの種の投射
形ブラウン管を示す。同図において、枠状の金属
構体からなる放熱板１を、内面にけい光面を形成
したけい光面パネル２とその前方に配置した透明
な前面パネル３の周縁部間に挾み、接着剤４によ
り固着配置されている。そして、放熱板１には第
２図に示すように注入口５が設けてあり、こを注
入口５から冷媒６を注入して密封されている。な
お７はブラウン管スカート部である。 FIG. 1 shows a conventionally used projection type cathode ray tube of this type. In the figure, a heat dissipation plate 1 made of a frame-shaped metal structure is sandwiched between the periphery of a phosphorescent panel 2 with a phosphorescent surface formed on the inner surface and a transparent front panel 3 placed in front of the phosphor panel 2. 4, it is fixedly arranged. The heat dissipation plate 1 is provided with an injection port 5 as shown in FIG. 2, and a refrigerant 6 is injected through the injection port 5 and sealed. Note that 7 is a cathode ray tube skirt portion.
このような構成においては、けい光面パネル２
の前面部の熱は冷媒６の対流によつて放熱板１に
伝導され、そこから外部へ放散されるため、パネ
ル２の中央部での温度上昇は抑えられ、輝度の低
下およびクラツクの発生の防止に効果がある。 In such a configuration, the fluorescent surface panel 2
The heat at the front of the panel is conducted to the heat sink 1 by the convection of the coolant 6, and is dissipated from there to the outside, so the temperature rise at the center of the panel 2 is suppressed, reducing brightness and cracking. Effective in prevention.
しかしながら、このように構成される投射形ブ
ラウン管は、けい光面パネル２のクラツクの発生
を防止できる反面、冷媒６がガラス製のけい光面
パネル２と前面パネル３との間に挾持されている
ため、この冷媒６に含有されている溶解金属イオ
ンが、ブラウン管の長時間動作中に両パネル２，
３の冷媒６と接触する表面層から溶出するアルカ
リ金属もしくはアルカリ土類金属の各イオンの温
度が徐々に増加するにともなつて両者が反応して
水酸化物の沈殿を発生させ、同図にドツトで示す
ような異物による画像欠陥８が発生するという問
題があつた。 However, although the projection type cathode ray tube configured in this manner can prevent the occurrence of cracks in the fluorescent surface panel 2, the coolant 6 is sandwiched between the fluorescent surface panel 2 and the front panel 3 made of glass. Therefore, the dissolved metal ions contained in this refrigerant 6 are absorbed into both panels 2 and 2 during long-time operation of the cathode ray tube.
As the temperature of each alkali metal or alkaline earth metal ion eluted from the surface layer in contact with the refrigerant 6 of 3 gradually increases, the two react to generate hydroxide precipitation, and as shown in the figure. There was a problem in that image defects 8 caused by foreign matter as shown by dots occurred.
したがつて本発明は、画像欠陥の発生を解消し
た高品位の画像が得られる投射形ブラウン管を提
供することを目的としている。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a projection type cathode ray tube that can obtain high-quality images without the occurrence of image defects.
このような目的を達成するために本発明は、冷
媒に錯化剤を添加して冷媒のPHを4.3〜9.5の範囲
内に設定したものである。
In order to achieve such an object, the present invention adds a complexing agent to a refrigerant to set the PH of the refrigerant within the range of 4.3 to 9.5.
次に本発明の実施例を詳細に説明する。 Next, embodiments of the present invention will be described in detail.
本発明は、前述したけい光面パネル２と前面パ
ネル３との間に封入させる冷媒６は、エチレング
リコール80wt％と、イオン交換純水20wt％と、
前記二者混合液に対してエチレンジアミン−４−
酢酸等の錯化剤0.05ppm〜2wt％とを含む混合液
を用い、この混合液のPHは4.3〜9.5の範囲内に設
定されている。 In the present invention, the refrigerant 6 sealed between the fluorescent surface panel 2 and the front panel 3 includes 80 wt% ethylene glycol and 20 wt% ion-exchanged pure water.
Ethylenediamine-4-
A mixed solution containing 0.05 ppm to 2 wt% of a complexing agent such as acetic acid is used, and the pH of this mixed solution is set within the range of 4.3 to 9.5.
このような構成によれば、冷媒６にエチレンジ
アミン−４−酢酸等の錯化剤を0.05ppm〜2wt％
添加してその冷媒６のPHを4.3〜9.5とすることに
より、前述した水酸化物の生成を防止することが
でき、したがつてブラウン管の長時間動作におい
ても前述した画像欠陥８の発生を皆無とすること
ができた。 According to such a configuration, 0.05 ppm to 2 wt% of a complexing agent such as ethylenediamine-4-acetic acid is added to the refrigerant 6.
By adding the refrigerant 6 to a pH of 4.3 to 9.5, it is possible to prevent the formation of the hydroxide described above, and therefore, even during long-term operation of the cathode ray tube, there is no occurrence of the image defect 8 described above. I was able to do this.
以上説明したように本発明によれば、冷媒とパ
ネルとの化学反応による画像欠陥の発生を防止し
て高品位の画像が得られるという極めて優れた効
果を有する。
As described above, according to the present invention, it is possible to prevent image defects caused by chemical reactions between the refrigerant and the panel, and to obtain high-quality images, which is an extremely excellent effect.
第１図は本発明による投射形ブラウン管の一例
を説明するための要部断面構成図、第２図は第１
図の平面図である。
１……放射板、２……けい光面パネル、３……
前面パネル、４……接着剤、５……注入口、６…
…冷媒、７……スカート部、８……画像欠陥。
FIG. 1 is a cross-sectional configuration diagram of essential parts for explaining an example of a projection type cathode ray tube according to the present invention, and FIG.
FIG. 1... Radiation plate, 2... Fluorescent surface panel, 3...
Front panel, 4...Adhesive, 5...Inlet, 6...
...Refrigerant, 7...Skirt portion, 8...Image defect.
Claims (1)
封してなる液冷式の投射形ブラウン管において、
前記冷媒に錯化剤を添加したことを特徴とする投
射形ブラウン管。 ２ 前記錯化剤の濃度を0.05ppm〜2wt％の範囲
としPHを4.3〜9.5の範囲内に設定することを特徴
とした特許請求の範囲第１項記載の投射形ブラウ
ン管。[Claims] 1. A liquid-cooled projection cathode ray tube in which a transparent liquid refrigerant is sealed in front of a fluorescent surface panel,
A projection type cathode ray tube characterized in that a complexing agent is added to the refrigerant. 2. The projection cathode ray tube according to claim 1, wherein the concentration of the complexing agent is set in the range of 0.05 ppm to 2 wt% and the pH is set in the range of 4.3 to 9.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59019915A JPS60165026A (en) | 1984-02-08 | 1984-02-08 | Projection-type cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59019915A JPS60165026A (en) | 1984-02-08 | 1984-02-08 | Projection-type cathode-ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60165026A JPS60165026A (en) | 1985-08-28 |
| JPH0578135B2 true JPH0578135B2 (en) | 1993-10-28 |
Family
ID=12012508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59019915A Granted JPS60165026A (en) | 1984-02-08 | 1984-02-08 | Projection-type cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60165026A (en) |
-
1984
- 1984-02-08 JP JP59019915A patent/JPS60165026A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60165026A (en) | 1985-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |