JPS6479714A - Automatic focusing device - Google Patents
Automatic focusing deviceInfo
- Publication number
- JPS6479714A JPS6479714A JP23702487A JP23702487A JPS6479714A JP S6479714 A JPS6479714 A JP S6479714A JP 23702487 A JP23702487 A JP 23702487A JP 23702487 A JP23702487 A JP 23702487A JP S6479714 A JPS6479714 A JP S6479714A
- Authority
- JP
- Japan
- Prior art keywords
- error
- lens group
- magnification
- focusing
- correction coefficient
- 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
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE:To attain high speed automatic focusing by providing a means for setting the correction coefficient of the magnification of a variable power lens and a means for correcting the error of focusing quantity. CONSTITUTION:The titled device provides a 1st correction coefficient setting means 80 for setting the correction coefficient of the magnification of the vari able power lens group 4 and a coefficient setting means 100 for correcting the effect on the moving quantity of the error of the magnification of the vari able power lens group 4 and the error of the defocusing quantity caused by errors in production in a dimension for prescribing the relation between the positions of a photodetector group and a fine lens group in a focus detection means. With such a constitution, a focusing controller 78 incorporates the set outputs from the 1st and the 2nd means 80 and 100 and executes correction arithmetic processing so as to calculate the moving quantity of a focus lens group. Namely, it is assumed that the correction coefficient alpha is specific within the range of 0.90<=alpha<=1.10. Thus, automatic focusing can be executed at high speed even when the error of the magnification of the variable power lens group and the error of the focusing quantity are large.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23702487A JPS6479714A (en) | 1987-09-21 | 1987-09-21 | Automatic focusing device |
US07/246,815 US4908643A (en) | 1987-09-21 | 1988-09-20 | Automatic focussing adjusting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23702487A JPS6479714A (en) | 1987-09-21 | 1987-09-21 | Automatic focusing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6479714A true JPS6479714A (en) | 1989-03-24 |
Family
ID=17009262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23702487A Pending JPS6479714A (en) | 1987-09-21 | 1987-09-21 | Automatic focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6479714A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01201634A (en) * | 1988-02-08 | 1989-08-14 | Olympus Optical Co Ltd | Focusing device for zoom lens camera |
JPH01201633A (en) * | 1988-02-08 | 1989-08-14 | Olympus Optical Co Ltd | Focus correcting device for camera with zoom lens |
JPH10186211A (en) * | 1996-12-23 | 1998-07-14 | Samsung Aerospace Ind Ltd | Device and method for zooming for camera |
JP2014186338A (en) * | 2014-05-15 | 2014-10-02 | Canon Inc | Imaging apparatus, imaging system, and method for controlling imaging apparatus |
JP2016194717A (en) * | 2016-07-06 | 2016-11-17 | キヤノン株式会社 | Imaging apparatus, imaging system, and focus detection method |
US9560258B2 (en) | 2008-08-25 | 2017-01-31 | Canon Kabushiki Kaisha | Image sensing apparatus, image sensing system and focus detection method of detecting a focus position of a lens using image signal pair |
-
1987
- 1987-09-21 JP JP23702487A patent/JPS6479714A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01201634A (en) * | 1988-02-08 | 1989-08-14 | Olympus Optical Co Ltd | Focusing device for zoom lens camera |
JPH01201633A (en) * | 1988-02-08 | 1989-08-14 | Olympus Optical Co Ltd | Focus correcting device for camera with zoom lens |
JPH10186211A (en) * | 1996-12-23 | 1998-07-14 | Samsung Aerospace Ind Ltd | Device and method for zooming for camera |
US9560258B2 (en) | 2008-08-25 | 2017-01-31 | Canon Kabushiki Kaisha | Image sensing apparatus, image sensing system and focus detection method of detecting a focus position of a lens using image signal pair |
JP2014186338A (en) * | 2014-05-15 | 2014-10-02 | Canon Inc | Imaging apparatus, imaging system, and method for controlling imaging apparatus |
JP2016194717A (en) * | 2016-07-06 | 2016-11-17 | キヤノン株式会社 | Imaging apparatus, imaging system, and focus detection method |
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