JPS55528A - Focus detecting method - Google Patents
Focus detecting methodInfo
- Publication number
- JPS55528A JPS55528A JP7315878A JP7315878A JPS55528A JP S55528 A JPS55528 A JP S55528A JP 7315878 A JP7315878 A JP 7315878A JP 7315878 A JP7315878 A JP 7315878A JP S55528 A JPS55528 A JP S55528A
- Authority
- JP
- Japan
- Prior art keywords
- pair
- confusion
- concave lens
- photo detectors
- photo
- 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
Abstract
PURPOSE: To accurately detect the focus position with a miniature and simple device from the output difference of a pair of photo detectors having optical serrations disposed near the best image plane of a concave lens by passing the incident light from a photographic lens through the concave lens thereby forming the impage in which the minimum circles of confusion spread.
CONSTITUTION: Light from an object 10 is imaged on a photo detector 13 through a photographic lens 11 and a concave lens 12 having negative power. The minimum circle of confusion 15 on the photo detector 13 is made larger than the minimum circle of confusion 16 of the case when no concave lens 12 is provided by the concave lens 12. The photo detector 13 consisting of a pair of photo detectors 13a, 13b is provided in this position and the image is formed thereon, whereby the minimum circle of confusion 15 may be obtained and always the same image may be formed on a pair of the photo detectors 13a, 13b. Further a pair of photo detectors 13a, 13b given optical serrations in front of either one of said elements are used and the focus position of the photographic lens is detected based on the output differences of a pair of the photo detectors 13a, 13b.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7315878A JPS55528A (en) | 1978-06-19 | 1978-06-19 | Focus detecting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7315878A JPS55528A (en) | 1978-06-19 | 1978-06-19 | Focus detecting method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55528A true JPS55528A (en) | 1980-01-05 |
Family
ID=13510080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7315878A Pending JPS55528A (en) | 1978-06-19 | 1978-06-19 | Focus detecting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55528A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63237015A (en) * | 1987-03-26 | 1988-10-03 | Asahi Optical Co Ltd | Focus detecting optical system |
JPS63195050U (en) * | 1987-05-30 | 1988-12-15 |
-
1978
- 1978-06-19 JP JP7315878A patent/JPS55528A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63237015A (en) * | 1987-03-26 | 1988-10-03 | Asahi Optical Co Ltd | Focus detecting optical system |
JPS63195050U (en) * | 1987-05-30 | 1988-12-15 |
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