JPS5678824A - Automatic focus detecting device - Google Patents
Automatic focus detecting deviceInfo
- Publication number
- JPS5678824A JPS5678824A JP15665879A JP15665879A JPS5678824A JP S5678824 A JPS5678824 A JP S5678824A JP 15665879 A JP15665879 A JP 15665879A JP 15665879 A JP15665879 A JP 15665879A JP S5678824 A JPS5678824 A JP S5678824A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- contrast
- slope signal
- slope
- 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 it possible to a fixed-precision focusing signal, by correcting inclination of the slope signal by the contrast signal to obtain a slope signal independent of contrast of the object.
CONSTITUTION: If phase slip j' between patterns A and B formed by outputs of photoelectric elements A1WAn and B1WBn becomes zero and double images agree with each other, the focus is obtained. Then, output signals a1Wan and b1Wbn of photoelectric elements are subjected to operation V=[(ai-bi+1)r-(ai+1-bi)p] and so on to obtain slope signal 3 which becomes zero in the focusing position and has the polarity inverted by the front pin or the back pin as shown in the figure. Though slope signal 3 changes dependently upon contrast of the object, inclination of the slope signal becomes fixed independently of change of contrast by dividing slope signal 3 by contrast signal 4, and thus, focusing range R becomes fixed.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15665879A JPS5678824A (en) | 1979-12-03 | 1979-12-03 | Automatic focus detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15665879A JPS5678824A (en) | 1979-12-03 | 1979-12-03 | Automatic focus detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5678824A true JPS5678824A (en) | 1981-06-29 |
Family
ID=15632462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15665879A Pending JPS5678824A (en) | 1979-12-03 | 1979-12-03 | Automatic focus detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5678824A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02267504A (en) * | 1989-04-10 | 1990-11-01 | Olympus Optical Co Ltd | Automatic focusing device |
US7486329B2 (en) | 2001-11-29 | 2009-02-03 | Olympus Optical Co., Ltd. | Focusing state signal output apparatus for a microscope representing a relative distance between a subject and an image sensing apparatus |
-
1979
- 1979-12-03 JP JP15665879A patent/JPS5678824A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02267504A (en) * | 1989-04-10 | 1990-11-01 | Olympus Optical Co Ltd | Automatic focusing device |
US7486329B2 (en) | 2001-11-29 | 2009-02-03 | Olympus Optical Co., Ltd. | Focusing state signal output apparatus for a microscope representing a relative distance between a subject and an image sensing apparatus |
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