JPS53121644A - Detecting method of focal position using holograph - Google Patents

Detecting method of focal position using holograph

Info

Publication number
JPS53121644A
JPS53121644A JP3648077A JP3648077A JPS53121644A JP S53121644 A JPS53121644 A JP S53121644A JP 3648077 A JP3648077 A JP 3648077A JP 3648077 A JP3648077 A JP 3648077A JP S53121644 A JPS53121644 A JP S53121644A
Authority
JP
Japan
Prior art keywords
focal position
holograph
detecting method
images
obtainanble
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
JP3648077A
Other languages
Japanese (ja)
Inventor
Shohei Nagai
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 JP3648077A priority Critical patent/JPS53121644A/en
Publication of JPS53121644A publication Critical patent/JPS53121644A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make the detection of focal position easy and enhance accuracy by disposing photo detectors, one before the two images obtainanble by a hologram and the other behind said images respectively and comparing the outputs thereof, in automatic focussing for the purpose of optical information reading of a video disc.
COPYRIGHT: (C)1978,JPO&Japio
JP3648077A 1977-03-31 1977-03-31 Detecting method of focal position using holograph Pending JPS53121644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3648077A JPS53121644A (en) 1977-03-31 1977-03-31 Detecting method of focal position using holograph

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3648077A JPS53121644A (en) 1977-03-31 1977-03-31 Detecting method of focal position using holograph

Publications (1)

Publication Number Publication Date
JPS53121644A true JPS53121644A (en) 1978-10-24

Family

ID=12470970

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3648077A Pending JPS53121644A (en) 1977-03-31 1977-03-31 Detecting method of focal position using holograph

Country Status (1)

Country Link
JP (1) JPS53121644A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028035A (en) * 1983-07-26 1985-02-13 Nippon Kogaku Kk <Nikon> Focus error detector for optical information reproducer
JPH0194542A (en) * 1987-10-05 1989-04-13 Matsushita Electric Ind Co Ltd Optical head device
JPH0194541A (en) * 1987-10-05 1989-04-13 Matsushita Electric Ind Co Ltd Optical head device
JPH04117635A (en) * 1989-06-06 1992-04-17 Pencom Internatl Corp Optical head assembly body of a semiconductor laser

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028035A (en) * 1983-07-26 1985-02-13 Nippon Kogaku Kk <Nikon> Focus error detector for optical information reproducer
JPH0447895B2 (en) * 1983-07-26 1992-08-05 Nippon Kogaku Kk
JPH0194542A (en) * 1987-10-05 1989-04-13 Matsushita Electric Ind Co Ltd Optical head device
JPH0194541A (en) * 1987-10-05 1989-04-13 Matsushita Electric Ind Co Ltd Optical head device
JPH04117635A (en) * 1989-06-06 1992-04-17 Pencom Internatl Corp Optical head assembly body of a semiconductor laser

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