JPS53121644A - Detecting method of focal position using holograph - Google Patents
Detecting method of focal position using holographInfo
- 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
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
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)
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 |
-
1977
- 1977-03-31 JP JP3648077A patent/JPS53121644A/en active Pending
Cited By (5)
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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