JPS55528A - Focus detecting method - Google Patents

Focus detecting method

Info

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
Application number
JP7315878A
Other languages
Japanese (ja)
Inventor
Kenichi Oikami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP7315878A priority Critical patent/JPS55528A/en
Publication of JPS55528A publication Critical patent/JPS55528A/en
Pending legal-status Critical Current

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
JP7315878A 1978-06-19 1978-06-19 Focus detecting method Pending JPS55528A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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