JPS564123A - Automatic focus controller - Google Patents
Automatic focus controllerInfo
- Publication number
- JPS564123A JPS564123A JP7889679A JP7889679A JPS564123A JP S564123 A JPS564123 A JP S564123A JP 7889679 A JP7889679 A JP 7889679A JP 7889679 A JP7889679 A JP 7889679A JP S564123 A JPS564123 A JP S564123A
- Authority
- JP
- Japan
- Prior art keywords
- detected
- image
- lens
- focus
- change
- 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.)
- Pending
Links
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To let the focus controlling by the change of the contrast of an image be accurately done by one lens system by vibrating the focus position detecting element comprising constituting two sets of photodetecting part groups in grating form on the same substrate by a vibrating device.
CONSTITUTION: If an image having random illuminance distributions is projected to a focus position detecting element 1 by way of a lens and the element 1 is vibrated by a vibrating device 3 and if the lens is moved from e.g. infinity toward the short distance direction at this same instant, the illuminance distributions for respective photodetecting parts 61W62n change periodically depending upon the position of the element 1 and the photocurrent corresponding to this is output from the electrodes 7 and 8. The changes in this photocurrent are detected respectively by the photodetecting part groups of the odd number place and even number place and the outputs thereof are detected by a differential amplifier 12, by which only the change components of the contrast of the image are fetched and the peak values thereof are detected with a peak value detecting circuit 13. Further, in a peak value is detected, whereby the focus positions is detected.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7889679A JPS564123A (en) | 1979-06-22 | 1979-06-22 | Automatic focus controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7889679A JPS564123A (en) | 1979-06-22 | 1979-06-22 | Automatic focus controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS564123A true JPS564123A (en) | 1981-01-17 |
Family
ID=13674568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7889679A Pending JPS564123A (en) | 1979-06-22 | 1979-06-22 | Automatic focus controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS564123A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101806987A (en) * | 2010-04-12 | 2010-08-18 | 中国科学院长春光学精密机械与物理研究所 | Focus detecting and controlling device of aerial camera |
-
1979
- 1979-06-22 JP JP7889679A patent/JPS564123A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101806987A (en) * | 2010-04-12 | 2010-08-18 | 中国科学院长春光学精密机械与物理研究所 | Focus detecting and controlling device of aerial camera |
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