JPS6476430A - Focusing error detector - Google Patents
Focusing error detectorInfo
- Publication number
- JPS6476430A JPS6476430A JP23241187A JP23241187A JPS6476430A JP S6476430 A JPS6476430 A JP S6476430A JP 23241187 A JP23241187 A JP 23241187A JP 23241187 A JP23241187 A JP 23241187A JP S6476430 A JPS6476430 A JP S6476430A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- photodetector
- light
- width
- focusing error
- 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)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To stabilize focusing servo by setting the width of the light receiving face of a bisected photodetector so that this width has prescribed relations to the degree of aperture of the light projected to a recording medium and the lateral magnification of the photodetector side to the recording medium side. CONSTITUTION:A width DW of respective light receiving faces of a pair of light detecting elements 21 and 22 constituting a bisected photodetector 20 is set to satisfy 20mum<=DW/M.tan(sin<-1>/NA)<=50mu where NA is the degree of aperture of the light projected to the recording medium and M is the lateral magnification of the photodetector side to the recording medium side. Thus, the frequency responsiveness, the stray light characteristic, and the focusing error signal characteristic are sufficiently secured, and the focusing error signal is not degraded and the quantity of stray light is reduced to improve the frequency responsiveness, and focusing servo is stably performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23241187A JPH0743835B2 (en) | 1987-09-18 | 1987-09-18 | Focus error detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23241187A JPH0743835B2 (en) | 1987-09-18 | 1987-09-18 | Focus error detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6476430A true JPS6476430A (en) | 1989-03-22 |
| JPH0743835B2 JPH0743835B2 (en) | 1995-05-15 |
Family
ID=16938828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23241187A Expired - Fee Related JPH0743835B2 (en) | 1987-09-18 | 1987-09-18 | Focus error detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743835B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0362321A (en) * | 1989-07-28 | 1991-03-18 | Matsushita Electric Ind Co Ltd | Optical recording device |
| JPH03157817A (en) * | 1989-11-15 | 1991-07-05 | Matsushita Electric Ind Co Ltd | Optical recording device |
| WO2013011937A1 (en) * | 2011-07-15 | 2013-01-24 | 株式会社エンプラス | Light receptacle and optical module equipped with same |
-
1987
- 1987-09-18 JP JP23241187A patent/JPH0743835B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0362321A (en) * | 1989-07-28 | 1991-03-18 | Matsushita Electric Ind Co Ltd | Optical recording device |
| JPH03157817A (en) * | 1989-11-15 | 1991-07-05 | Matsushita Electric Ind Co Ltd | Optical recording device |
| WO2013011937A1 (en) * | 2011-07-15 | 2013-01-24 | 株式会社エンプラス | Light receptacle and optical module equipped with same |
| JP2013024918A (en) * | 2011-07-15 | 2013-02-04 | Enplas Corp | Optical receptacle and optical module including the same |
| CN103703399A (en) * | 2011-07-15 | 2014-04-02 | 恩普乐股份有限公司 | Light receptacle and optical module equipped with same |
| US9213153B2 (en) | 2011-07-15 | 2015-12-15 | Enplas Corporation | Light receptacle and optical module equipped with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0743835B2 (en) | 1995-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |