JPS59184110U - automatic focus detection device - Google Patents
automatic focus detection deviceInfo
- Publication number
- JPS59184110U JPS59184110U JP7699983U JP7699983U JPS59184110U JP S59184110 U JPS59184110 U JP S59184110U JP 7699983 U JP7699983 U JP 7699983U JP 7699983 U JP7699983 U JP 7699983U JP S59184110 U JPS59184110 U JP S59184110U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- detection circuit
- contrast
- element array
- 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図は撮影レンズによるコントラスト分布を示す光学
系説明図、第２図はコントラスト値を検出するための光
電素子列の配置状態を示す光学系説明図、第３図はこの
考案に係る自動焦点検出装置の構成を説明するブロック
図、第４図は輝度変調選択回路の一実施例を説明する回
路図、第５図は第４図の各部位における信号波形を説明
するタイミングチャート、第６図はコントラスト選択回
路の一実施例を説明する回路図、第７図はこの考案に係
る装置を用いた場合に得られるコントラスト分布の変化
を示す説明図である。
７・・・光電変換回路、８・・・駆動回路、１１・・・
コントラスト検出回路、１２・・・最大コントラスト値
検出回路、１３・・・輝度変調選択回路、Ｍｌ・・・モ
ニターセンサ、Ｓｌ・・・光電素子列、ＳＲ１・・・走
査回路。
トー−］
ｒ１人ム１ヘベＬFig. 1 is an explanatory diagram of the optical system showing the contrast distribution due to the photographic lens, Fig. 2 is an explanatory diagram of the optical system showing the arrangement of photoelectric element arrays for detecting contrast values, and Fig. 3 is an explanatory diagram of the optical system showing the arrangement of photoelectric element arrays for detecting contrast values. 4 is a block diagram illustrating the configuration of the detection device, FIG. 4 is a circuit diagram illustrating an embodiment of the brightness modulation selection circuit, FIG. 5 is a timing chart illustrating signal waveforms at each part in FIG. 4, and FIG. 7 is a circuit diagram illustrating one embodiment of the contrast selection circuit, and FIG. 7 is an explanatory diagram showing changes in contrast distribution obtained when using the device according to this invention. 7... Photoelectric conversion circuit, 8... Drive circuit, 11...
Contrast detection circuit, 12... Maximum contrast value detection circuit, 13... Luminance modulation selection circuit, Ml... Monitor sensor, Sl... Photoelectric element array, SR1... Scanning circuit. To-] r1 person mu 1 hebe L
Claims (3)
個の微小光電素子を被写体像の撮像面位置に配列して成
る光電素子列、該光電素子列に沿って配置され被写体像
の平均的光強度を検出するモニターセンサ、および前記
光電素子列を走査して被写体像の光強度の時系列信号を
取り出す走査回路をそれぞれ有する光電変換回路と、該
光電変換回路の光電素子列から得られる時系列信号を入
力して被写体像のコントラスト信号を検出するコントラ
スト検出回路と、該コントラスト検出回路の出力を受け
てコントラスト信号の最大値を検出する最大コントラス
ト値検出回路と、 該最大コントラスト値検出回路の出力に応じて選択され
る選択スイッチに対応した閾値レベルを、前記モニター
センサの出力と比較してモニターセンサの出力レベルを
規制する一方、その比較して得られる出力を前記走査回
路の駆動を図る駆動回路に供給することにより、前記光
電素子列の電荷蓄積時間を前記閾値レベルに応じて設定
する輝度変調選択回路とを備えたことを特徴とする自動
焦点検出装置。(1) A photoelectric element array consisting of a plurality of microphotoelectric elements arranged at the imaging surface position of the subject image, which accumulates charge according to the light intensity of the subject image; A photoelectric conversion circuit each having a monitor sensor that detects average light intensity, and a scanning circuit that scans the photoelectric element array to extract a time-series signal of the light intensity of a subject image; a contrast detection circuit that detects a contrast signal of a subject image by inputting a time-series signal from the contrast detection circuit; a maximum contrast value detection circuit that receives an output of the contrast detection circuit and detects a maximum value of the contrast signal; The threshold level corresponding to the selection switch selected according to the output of the circuit is compared with the output of the monitor sensor to regulate the output level of the monitor sensor, and the output obtained by the comparison is used to drive the scanning circuit. An automatic focus detection apparatus comprising: a brightness modulation selection circuit that sets a charge accumulation time of the photoelectric element array in accordance with the threshold level by supplying the power to a drive circuit that achieves this.
超えている場合、輝度変調選択回路の閾値レベルを低下
させることにより該最大コントラスト値検出回路の出力
低下を図って光電素子列の電荷蓄積時間を短縮させるこ
とを特徴とする実用新案登録請求の範囲第１項記載の自
動焦点検出装置。(2) If the output of the maximum contrast value detection circuit exceeds a predetermined value, the threshold level of the brightness modulation selection circuit is lowered to reduce the output of the maximum contrast value detection circuit and charge accumulation in the photoelectric element array An automatic focus detection device according to claim 1, characterized in that the automatic focus detection device reduces the time required.
達していない場合、輝度変調選択回路の閾値レベルを上
昇させることにより該最大コントラスト値検出回路の出
力上昇を図って光電素子列の電荷蓄積時間を延長させる
ことを特徴とする実用新案登録請求の範囲第１項記載の
自動焦点検出装置。(3) If the output of the maximum contrast value detection circuit does not reach a predetermined value, increase the threshold level of the brightness modulation selection circuit to increase the output of the maximum contrast value detection circuit and accumulate charges in the photoelectric element array. An automatic focus detection device according to claim 1, characterized in that the time is extended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7699983U JPS59184110U (en) | 1983-05-24 | 1983-05-24 | automatic focus detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7699983U JPS59184110U (en) | 1983-05-24 | 1983-05-24 | automatic focus detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59184110U true JPS59184110U (en) | 1984-12-07 |
| JPH04332Y2 JPH04332Y2 (en) | 1992-01-08 |
Family
ID=30207046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7699983U Granted JPS59184110U (en) | 1983-05-24 | 1983-05-24 | automatic focus detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59184110U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51140510A (en) * | 1975-05-30 | 1976-12-03 | Kyocera Corp | Photoelectric converter device |
| JPS53141030A (en) * | 1977-05-14 | 1978-12-08 | Ricoh Co Ltd | Camera provided with focused point detector |
| JPS54121689A (en) * | 1978-03-15 | 1979-09-20 | Canon Inc | Adjustment method of charge storage time for photo sensor device |
-
1983
- 1983-05-24 JP JP7699983U patent/JPS59184110U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51140510A (en) * | 1975-05-30 | 1976-12-03 | Kyocera Corp | Photoelectric converter device |
| JPS53141030A (en) * | 1977-05-14 | 1978-12-08 | Ricoh Co Ltd | Camera provided with focused point detector |
| JPS54121689A (en) * | 1978-03-15 | 1979-09-20 | Canon Inc | Adjustment method of charge storage time for photo sensor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04332Y2 (en) | 1992-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4681767B2 (en) | Imaging device and camera | |
| JPH0252475B2 (en) | ||
| JP2893687B2 (en) | Focus detection device | |
| JPS59184110U (en) | automatic focus detection device | |
| JPS6255352B2 (en) | ||
| JPS6093878A (en) | Picture reader | |
| US6073850A (en) | Optical reader for information pattern representing coded data | |
| JP2523864B2 (en) | Automatic sensitivity control method for solid-state imaging device | |
| JPS60236569A (en) | Picture reading correction method | |
| JPS5963568U (en) | Detector of image signals in image scanning and recording devices | |
| JPH0799600A (en) | Image pickup device with automatic focus device | |
| JP2802946B2 (en) | Still video camera | |
| JP3205400B2 (en) | CCD camera and its driving method | |
| JPH03216060A (en) | Picture reader | |
| JPH0666919B2 (en) | Video camera equipment | |
| JP2796817B2 (en) | Driving device for image sensor | |
| KR19990031917A (en) | Method of adjusting brightness of image reader and its device | |
| JP2714951B2 (en) | Imaging device | |
| JPH04172073A (en) | Image pickup device | |
| JPH033570A (en) | Video camera equipment | |
| JPS5962268A (en) | Picture scanner | |
| JPH0834555B2 (en) | Electronic camera | |
| JPH07177433A (en) | Method for driving solid-state image pickup element | |
| JPS58178761U (en) | Focus adjustment device for imaging device | |
| JPH02260974A (en) | Binary signal detecting circuit |