JPS6448052A - Automatic focusing device - Google Patents
Automatic focusing deviceInfo
- Publication number
- JPS6448052A JPS6448052A JP20461587A JP20461587A JPS6448052A JP S6448052 A JPS6448052 A JP S6448052A JP 20461587 A JP20461587 A JP 20461587A JP 20461587 A JP20461587 A JP 20461587A JP S6448052 A JPS6448052 A JP S6448052A
- Authority
- JP
- Japan
- Prior art keywords
- light emission
- distance measurement
- weighted average
- distance
- focusing
- 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 make the distance measurement information in a center part important so as to prevent the focusing of the nearest peripheral object and to prevent the focusing in the center part from being soft by setting the near weighted average result of distance measurement as a focal distance. CONSTITUTION:According to a control signal from an MPU 6, a light emission control circuit 2 executes primary light emission that light projecting elements 1a and 1b are lighted in a set timing and secondary light emission that the light projecting elements 1b and 1c are lighted in a set timing. And the reflected light from an object is formed into a real image on the surface of a photodetector 3 and according to the output thereof, the distance to the object corresponding to respective range-finding points in an image plane is calculated in a range- finding circuit 4 so as to compute the weighted average result of distance measurement by the primary light emission and the secondary light emission. The respective weighted average results of distance measurement are read in the MPU 6 and the focusing position that the near weighted average result of distance measurement is set as the focal distance is computed. Based on the computed result, a driving circuit 7 moves a photographic lens unit 8 to a specified position.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20461587A JPS6448052A (en) | 1987-08-18 | 1987-08-18 | Automatic focusing device |
US08/072,860 US5313245A (en) | 1987-04-24 | 1993-06-07 | Automatic focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20461587A JPS6448052A (en) | 1987-08-18 | 1987-08-18 | Automatic focusing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6448052A true JPS6448052A (en) | 1989-02-22 |
Family
ID=16493408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20461587A Pending JPS6448052A (en) | 1987-04-24 | 1987-08-18 | Automatic focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6448052A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001272597A (en) * | 2001-02-13 | 2001-10-05 | Olympus Optical Co Ltd | Ranging device |
-
1987
- 1987-08-18 JP JP20461587A patent/JPS6448052A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001272597A (en) * | 2001-02-13 | 2001-10-05 | Olympus Optical Co Ltd | Ranging device |
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