JPS57158819A - Method for focusing detection - Google Patents
Method for focusing detectionInfo
- Publication number
- JPS57158819A JPS57158819A JP4418281A JP4418281A JPS57158819A JP S57158819 A JPS57158819 A JP S57158819A JP 4418281 A JP4418281 A JP 4418281A JP 4418281 A JP4418281 A JP 4418281A JP S57158819 A JPS57158819 A JP S57158819A
- Authority
- JP
- Japan
- Prior art keywords
- appreciation
- fundamental
- circuit
- appreciation method
- lens
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To extend the range of possibility of focus detection, by using a different appreciation method to discriminate the focus when the appreciation function based on a based on a fundamental appreciation method is lower than a prescribed level. CONSTITUTION:An object 1 is projected as an optical image onto a photodetector array 3 by a focusing lens 2, and respective outputs of photodetectors are subjected to A/D conversion in parallel in a circuit 4 to operate a fundamental appreciation function in a central processing device 5. When the operation result is lower than a prescribed threshold, a memory selecting circuit 30 is controlled by the device 5, and the selective read mode of a digital memory in the A/D converting circuit 4 is changed to switch the appreciation method to a different appreciation method. The lens 2 is moved by an optical system driving device 8, and the focusing state is displayed on a display device 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4418281A JPS57158819A (en) | 1981-03-27 | 1981-03-27 | Method for focusing detection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4418281A JPS57158819A (en) | 1981-03-27 | 1981-03-27 | Method for focusing detection |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57158819A true JPS57158819A (en) | 1982-09-30 |
JPH0377487B2 JPH0377487B2 (en) | 1991-12-10 |
Family
ID=12684426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4418281A Granted JPS57158819A (en) | 1981-03-27 | 1981-03-27 | Method for focusing detection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57158819A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59177509A (en) * | 1983-03-29 | 1984-10-08 | Kyocera Corp | Automatic focus control device at moving limit on infinite side of lens |
JP2007219029A (en) * | 2006-02-15 | 2007-08-30 | Sharp Corp | Automatic focusing device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5557809A (en) * | 1978-10-24 | 1980-04-30 | Olympus Optical Co Ltd | Focusing detection system |
JPS5587114A (en) * | 1978-12-25 | 1980-07-01 | Agency Of Ind Science & Technol | Focus position detector |
JPS5589819A (en) * | 1978-12-28 | 1980-07-07 | Asahi Optical Co Ltd | Focus detector of camera |
-
1981
- 1981-03-27 JP JP4418281A patent/JPS57158819A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5557809A (en) * | 1978-10-24 | 1980-04-30 | Olympus Optical Co Ltd | Focusing detection system |
JPS5587114A (en) * | 1978-12-25 | 1980-07-01 | Agency Of Ind Science & Technol | Focus position detector |
JPS5589819A (en) * | 1978-12-28 | 1980-07-07 | Asahi Optical Co Ltd | Focus detector of camera |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59177509A (en) * | 1983-03-29 | 1984-10-08 | Kyocera Corp | Automatic focus control device at moving limit on infinite side of lens |
JPH0380289B2 (en) * | 1983-03-29 | 1991-12-24 | Kyocera Corp | |
JP2007219029A (en) * | 2006-02-15 | 2007-08-30 | Sharp Corp | Automatic focusing device |
Also Published As
Publication number | Publication date |
---|---|
JPH0377487B2 (en) | 1991-12-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS57158820A (en) | Method for focusing detection | |
JPS57102609A (en) | Method and device for scanning using plural number of beams | |
JPS54139342A (en) | Information processing unit | |
JPS57161839A (en) | Distance measuring device of camera | |
EP0290802A3 (en) | Focusing system for camera apparatus | |
JPS5697325A (en) | Focus detecting method of camera | |
JPS52147430A (en) | Focus detection device | |
JPS57158819A (en) | Method for focusing detection | |
JPS52119124A (en) | Reader for bar-code label | |
JPS57204504A (en) | Photodetection part of focus detector | |
JPS5387217A (en) | Focusing device | |
JPS5319806A (en) | Information reproducer | |
EP0387088A3 (en) | Focus detection apparatus | |
JPS55154655A (en) | Picture processing system for medical use | |
JPS52153454A (en) | Automatic focus controlling apparatus | |
JPS535649A (en) | Automatic focusing device | |
JPS5722211A (en) | Focusing detecting system | |
EP0382564A3 (en) | Focus state detecting device | |
JPS54110563A (en) | Optical read-out system | |
JPS5745777A (en) | Character picture processor | |
JPS57120926A (en) | Copying machine for microfilm | |
JPS57136638A (en) | Optical film | |
JPS56150713A (en) | Focusing detection | |
JPS54110734A (en) | Optical reading device | |
JPS56146108A (en) | Focusing detection system |