JPH0534731B2 - - Google Patents
Info
- Publication number
- JPH0534731B2 JPH0534731B2 JP12299684A JP12299684A JPH0534731B2 JP H0534731 B2 JPH0534731 B2 JP H0534731B2 JP 12299684 A JP12299684 A JP 12299684A JP 12299684 A JP12299684 A JP 12299684A JP H0534731 B2 JPH0534731 B2 JP H0534731B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflected
- photodetector
- light receiving
- error signal
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 46
- 238000003384 imaging method Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12299684A JPS613330A (ja) | 1984-06-15 | 1984-06-15 | 光学的記録再生ヘツド |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12299684A JPS613330A (ja) | 1984-06-15 | 1984-06-15 | 光学的記録再生ヘツド |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS613330A JPS613330A (ja) | 1986-01-09 |
| JPH0534731B2 true JPH0534731B2 (nl) | 1993-05-24 |
Family
ID=14849695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12299684A Granted JPS613330A (ja) | 1984-06-15 | 1984-06-15 | 光学的記録再生ヘツド |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS613330A (nl) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0743833B2 (ja) * | 1986-05-12 | 1995-05-15 | 松下電器産業株式会社 | 光学式記録再生装置 |
| JP2746593B2 (ja) * | 1988-02-29 | 1998-05-06 | オリンパス光学工業株式会社 | 光学式情報読み取り装置 |
| US5315574A (en) * | 1988-10-28 | 1994-05-24 | Matsushita Electric Industrial Co., Ltd. | Optical head with polarized beam hologram |
| JP2591302B2 (ja) * | 1990-09-26 | 1997-03-19 | 松下電器産業株式会社 | フォーカスエラー検出装置 |
| JPH06259790A (ja) * | 1993-11-15 | 1994-09-16 | Canon Inc | 光ピックアップ装置 |
| JP3407679B2 (ja) | 1998-03-24 | 2003-05-19 | 日本電気株式会社 | 光ヘッド及び光ヘッドの製造装置 |
| JP4929885B2 (ja) * | 2006-07-12 | 2012-05-09 | 富士ゼロックス株式会社 | ビーム径測定装置および焦点調整装置 |
-
1984
- 1984-06-15 JP JP12299684A patent/JPS613330A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS613330A (ja) | 1986-01-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |