JPS54104803A - Focus detector in optical recorder-reproducer - Google Patents
Focus detector in optical recorder-reproducerInfo
- Publication number
- JPS54104803A JPS54104803A JP1180478A JP1180478A JPS54104803A JP S54104803 A JPS54104803 A JP S54104803A JP 1180478 A JP1180478 A JP 1180478A JP 1180478 A JP1180478 A JP 1180478A JP S54104803 A JPS54104803 A JP S54104803A
- Authority
- JP
- Japan
- Prior art keywords
- aperture lens
- disc
- recording
- reproducer
- axis direction
- 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.)
- Granted
Links
Landscapes
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To enable the size of minute spot light on a recording medium to be always maintained at the size optimum for recording and reproducing by providing a means of varying the distance between aperture lens and recording medium.
CONSTITUTION: Focus controlling is accomplished by moving an aperture lens 7 in the arrow Z axis direction so that the respective quantities of receiving light of photo detectors 13, 14 become always equal. If the photo detectors 13, 14 are moved in the Y-axis direction while performing focus controlling, the distance between the aperture lens 7 and disc 10 may be selected as desired. When a disc 10 is placed in the optimum recording position, it turns out that the imaging position of the aperture lens 7 is above the disc 10, and the quantity of reflected light to be fed back to a semiconductor laser 1 of that time becomes maximum.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1180478A JPS54104803A (en) | 1978-02-03 | 1978-02-03 | Focus detector in optical recorder-reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1180478A JPS54104803A (en) | 1978-02-03 | 1978-02-03 | Focus detector in optical recorder-reproducer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54104803A true JPS54104803A (en) | 1979-08-17 |
JPS6217287B2 JPS6217287B2 (en) | 1987-04-16 |
Family
ID=11788031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1180478A Granted JPS54104803A (en) | 1978-02-03 | 1978-02-03 | Focus detector in optical recorder-reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54104803A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5883338A (en) * | 1981-11-10 | 1983-05-19 | Teac Co | Optical recording system |
JPS59127238A (en) * | 1982-12-30 | 1984-07-23 | Sony Corp | Optical information recorder |
-
1978
- 1978-02-03 JP JP1180478A patent/JPS54104803A/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5883338A (en) * | 1981-11-10 | 1983-05-19 | Teac Co | Optical recording system |
JPS5883339A (en) * | 1981-11-10 | 1983-05-19 | Teac Co | Recording or reproducing system |
JPS6233652B2 (en) * | 1981-11-10 | 1987-07-22 | Teac Corp | |
JPS6334529B2 (en) * | 1981-11-10 | 1988-07-11 | Teac Corp | |
JPS59127238A (en) * | 1982-12-30 | 1984-07-23 | Sony Corp | Optical information recorder |
JPH0438050B2 (en) * | 1982-12-30 | 1992-06-23 | Sony Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS6217287B2 (en) | 1987-04-16 |
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