JPS6247274U - - Google Patents
Info
- Publication number
- JPS6247274U JPS6247274U JP13976385U JP13976385U JPS6247274U JP S6247274 U JPS6247274 U JP S6247274U JP 13976385 U JP13976385 U JP 13976385U JP 13976385 U JP13976385 U JP 13976385U JP S6247274 U JPS6247274 U JP S6247274U
- Authority
- JP
- Japan
- Prior art keywords
- inverting amplifier
- image signal
- amplifier circuit
- photometry
- amplified
- 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
- 238000005375 photometry Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 11
- 230000035945 sensitivity Effects 0.000 description 1
Description
第１図は本考案装置の一実施例における要部の
回路図、第２図はその切換調整による特性の変化
の関係を示す概略説明図、第３図は従来装置にお
ける回路図、第４図はその特性を示す説明図、第
５図は他の従来装置における回路図、第６図はそ
の特性を示す説明図、第７図は被写体と各回路段
階における画像信号波形を示す説明図、第８図は
第３の手段におけるリミツタ回路の特性を示す説
明図、第９図はその各段階における画像信号波形
を示す説明図、第１０図は従来の問題点のある制
御手段による特性を説明する説明図である。
…反転増幅回路、…倍電圧整流回路、―
リミツタ回路、３…演算増幅器、７…感度調整用
可変抵抗、８，１５，１６…測光調整用可変抵抗
、９…倍電圧用コンデンサ、１０…倍電圧用ダイ
オード、１４…リミツタ回路のダイオード。
Fig. 1 is a circuit diagram of the main part of an embodiment of the device of the present invention, Fig. 2 is a schematic explanatory diagram showing the relationship between changes in characteristics due to switching adjustment, Fig. 3 is a circuit diagram of a conventional device, and Fig. 4 5 is an explanatory diagram showing its characteristics, FIG. 5 is a circuit diagram of another conventional device, FIG. 6 is an explanatory diagram showing its characteristics, FIG. 7 is an explanatory diagram showing the subject and image signal waveforms at each circuit stage, and FIG. Fig. 8 is an explanatory diagram showing the characteristics of the limiter circuit in the third means, Fig. 9 is an explanatory diagram showing the image signal waveform at each stage thereof, and Fig. 10 is an explanatory diagram showing the characteristics of the conventional control means with problems. It is an explanatory diagram. ...inverting amplifier circuit, ...voltage doubler rectifier circuit, -
Limiter circuit, 3... operational amplifier, 7... variable resistor for sensitivity adjustment, 8, 15, 16... variable resistor for photometry adjustment, 9... capacitor for voltage doubler, 10... diode for voltage doubler, 14... diode for limiter circuit.
Claims (1)
て増幅率可変に反転増幅する反転増幅回路からな
る第１の手段と、該反転増幅回路で反転増幅され
た画像信号を充電電圧を調整可能に倍電圧整流す
るコンデンサを含む倍電圧整流回路からなるピー
ク的測光調整を行う第２の手段と、前記反転増幅
回路内に反転増幅された画像信号のマイナス側の
信号を調整可能に制限するリミツタ回路からなる
平均的測光調整を行う第３の手段とを具備し、前
記第２の手段と第３の手段を必要に応じて自由に
切換え使用可能に構成すると共に、ローコントラ
スト時に前記第２又は第３の手段を調整しても第
１の手段により調整した画像出力信号が著しく変
化しないことを特徴とするテレビカメラ用レンズ
の可変測光型自動絞り制御装置。 A first means includes an inverting amplifier circuit that inverts and amplifies an image signal from a television camera with a variable amplification factor with respect to a reference voltage, and a voltage doubler that adjusts the charging voltage of the image signal that has been inverted and amplified by the inverting amplifier circuit. a second means for performing peak photometry adjustment consisting of a voltage doubler rectifier circuit including a rectifying capacitor; and a limiter circuit for adjustablely limiting the negative side signal of the image signal inverted and amplified in the inverting amplifier circuit. and a third means for adjusting the average photometry, the second means and the third means can be freely switched and used as necessary, and the second or third means can be used when the contrast is low. 1. A variable photometry type automatic diaphragm control device for a television camera lens, characterized in that even when the means is adjusted, the image output signal adjusted by the first means does not change significantly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985139763U JPH0733495Y2 (en) | 1985-09-12 | 1985-09-12 | Variable photometric automatic aperture controller for TV camera lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985139763U JPH0733495Y2 (en) | 1985-09-12 | 1985-09-12 | Variable photometric automatic aperture controller for TV camera lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6247274U true JPS6247274U (en) | 1987-03-23 |
| JPH0733495Y2 JPH0733495Y2 (en) | 1995-07-31 |
Family
ID=31045972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985139763U Expired - Lifetime JPH0733495Y2 (en) | 1985-09-12 | 1985-09-12 | Variable photometric automatic aperture controller for TV camera lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733495Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5850867A (en) * | 1981-09-22 | 1983-03-25 | Asahi Seimitsu Kk | Automatic aperture controller for cctv camera |
| JPS59108455A (en) * | 1982-12-14 | 1984-06-22 | Asahi Seimitsu Kk | Automatic stop controller of automatic stop lens for cctv camera |
| JPS6262669A (en) * | 1985-09-12 | 1987-03-19 | Asahi Seimitsu Kk | Variable photometric type automatic diaphragm controller for television camera lens |
-
1985
- 1985-09-12 JP JP1985139763U patent/JPH0733495Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5850867A (en) * | 1981-09-22 | 1983-03-25 | Asahi Seimitsu Kk | Automatic aperture controller for cctv camera |
| JPS59108455A (en) * | 1982-12-14 | 1984-06-22 | Asahi Seimitsu Kk | Automatic stop controller of automatic stop lens for cctv camera |
| JPS6262669A (en) * | 1985-09-12 | 1987-03-19 | Asahi Seimitsu Kk | Variable photometric type automatic diaphragm controller for television camera lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0733495Y2 (en) | 1995-07-31 |
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