JPS58116377U - Beam current control circuit for video projector - Google Patents
Beam current control circuit for video projectorInfo
- Publication number
- JPS58116377U JPS58116377U JP1188782U JP1188782U JPS58116377U JP S58116377 U JPS58116377 U JP S58116377U JP 1188782 U JP1188782 U JP 1188782U JP 1188782 U JP1188782 U JP 1188782U JP S58116377 U JPS58116377 U JP S58116377U
- Authority
- JP
- Japan
- Prior art keywords
- cathode ray
- beam current
- video projector
- circuit
- control circuit
- 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案によるビデオプロジェクタやビーム電流
制御回路の一実施例を示す回路眸第２図は他の実施例を
示す回路図である。
−１・・・原色信号発生回路、２ａ〜２ｃ・・・第１〜
第３カツトオフ回路、３ａ〜３Ｃ・・・第１〜第３陰極
線管組動回路、４−・・スイッチ回路、５ａ〜５ｃ・・
・スイッチ、７ａ〜７Ｃ・・・スイッチング素子、８・
・・オアゲート・、１０・・・輝度リミッタ−回路、１
１・・・輝度コレトロール回路、１２・・・可変抵抗器
、１３，１４． −１８・・・抵抗、１６・・・イン
バータ、１７・・・アントゲ ゛−ト、１９・・・ス
イッチング素子。FIG. 1 is a circuit diagram showing one embodiment of a video projector and beam current control circuit according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment. -1...Primary color signal generation circuit, 2a to 2c...first to
Third cut-off circuit, 3a to 3C... First to third cathode ray tube assembly circuit, 4-... Switch circuit, 5a to 5c...
・Switch, 7a to 7C...Switching element, 8・
...OR gate...10...Brightness limiter circuit, 1
1... Brightness core control circuit, 12... Variable resistor, 13, 14. -18...Resistor, 16...Inverter, 17...Ant gate, 19...Switching element.
Claims (1)
光学系を介して同一スクリーンに投写することによりカ
ラー画像を再生す払とともに、上記各陰極線管に対して
総合的に輝度リミッタ−が作用するビデオプロジェクタ
に於いて、各陰極線管に対応−シて設けられたスイッチ
と、このスイッチの選択操作に対応して対応する陰極線
管への原色信号の供給をそれぞれカットするカットオフ
回路と、前記いずれかのスイッチの操作時に輝度コント
ロール信号のレベルを下げてカットオフ制御が行なわれ
ない残りの陰極線管に対するビーム電流の許容値越えを
防止する輝度コントロール回路とを備えたビデオプロジ
ェクタのビーム電流制御回路。In addition to reproducing a color image by projecting images displayed on multiple cathode ray tubes responsible for each color onto the same screen via an optical system, a comprehensive brightness limiter is applied to each of the cathode ray tubes. In a working video projector, a switch is provided corresponding to each cathode ray tube, and a cutoff circuit that cuts off the supply of primary color signals to the corresponding cathode ray tube in response to a selection operation of the switch; Beam current control for a video projector, comprising a brightness control circuit that lowers the level of a brightness control signal when any of the switches is operated to prevent the beam current from exceeding a permissible value for the remaining cathode ray tubes for which cutoff control is not performed. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1188782U JPS58116377U (en) | 1982-01-31 | 1982-01-31 | Beam current control circuit for video projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1188782U JPS58116377U (en) | 1982-01-31 | 1982-01-31 | Beam current control circuit for video projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58116377U true JPS58116377U (en) | 1983-08-09 |
| JPS636948Y2 JPS636948Y2 (en) | 1988-02-27 |
Family
ID=30024476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1188782U Granted JPS58116377U (en) | 1982-01-31 | 1982-01-31 | Beam current control circuit for video projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58116377U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8972658B2 (en) | 2004-03-31 | 2015-03-03 | Nintendo Co., Ltd. | Game console and memory card |
-
1982
- 1982-01-31 JP JP1188782U patent/JPS58116377U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8972658B2 (en) | 2004-03-31 | 2015-03-03 | Nintendo Co., Ltd. | Game console and memory card |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS636948Y2 (en) | 1988-02-27 |
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