CA1191949A - Optical reproducing device having a focus servo system - Google Patents
Optical reproducing device having a focus servo systemInfo
- Publication number
- CA1191949A CA1191949A CA000393543A CA393543A CA1191949A CA 1191949 A CA1191949 A CA 1191949A CA 000393543 A CA000393543 A CA 000393543A CA 393543 A CA393543 A CA 393543A CA 1191949 A CA1191949 A CA 1191949A
- Authority
- CA
- Canada
- Prior art keywords
- circuit
- output
- reproducing device
- optical reproducing
- focusing lens
- 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
Links
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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
-
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
-
- 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
- G11B7/0909—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 by astigmatic methods
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56004165A JPS57120237A (en) | 1981-01-14 | 1981-01-14 | Optical reproducing device |
| JP4165/81 | 1981-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1191949A true CA1191949A (en) | 1985-08-13 |
Family
ID=11577124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000393543A Expired CA1191949A (en) | 1981-01-14 | 1982-01-04 | Optical reproducing device having a focus servo system |
Country Status (7)
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58155527A (ja) * | 1982-03-10 | 1983-09-16 | Hitachi Ltd | 光デイスクプレ−ヤのフオ−カス引き込み回路 |
| EP0095852A1 (en) * | 1982-05-19 | 1983-12-07 | BURROUGHS CORPORATION (a Michigan corporation) | Focusing control circuitry for an optical memory system |
| JPS59140642A (ja) * | 1983-01-31 | 1984-08-13 | Canon Inc | トラツキングエラ−信号検出装置 |
| JPS6134734A (ja) * | 1984-07-25 | 1986-02-19 | Sony Corp | 光学式デイスクプレ−ヤ |
| JP2004185741A (ja) * | 2002-12-04 | 2004-07-02 | Mitsubishi Electric Corp | 光学式ディスク装置 |
| US7137775B2 (en) * | 2003-03-20 | 2006-11-21 | Huntair Inc. | Fan array fan section in air-handling systems |
| KR100520508B1 (ko) * | 2003-09-27 | 2005-10-11 | 삼성전자주식회사 | 포커스 인입 장치 및 방법 |
| US7408728B2 (en) * | 2006-12-04 | 2008-08-05 | Quality Vision International, Inc. | System and method for focal length stabilization using active temperature control |
| US10361554B1 (en) * | 2016-09-27 | 2019-07-23 | Altera Corporation | Techniques for determining inductances |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL182257C (nl) * | 1974-12-23 | 1988-02-01 | Philips Nv | Inrichting voor het uitlezen van een vlakke reflekterende registratiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur. |
| GB2027881B (en) * | 1978-07-19 | 1983-04-27 | Universal Pioneer Corp | In-focus detecting device |
| JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
| JPS5694528A (en) * | 1979-12-28 | 1981-07-31 | Matsushita Electric Ind Co Ltd | Drawing-in method of focus servo |
-
1981
- 1981-01-14 JP JP56004165A patent/JPS57120237A/ja active Pending
-
1982
- 1982-01-04 CA CA000393543A patent/CA1191949A/en not_active Expired
- 1982-01-07 US US06/337,825 patent/US4426690A/en not_active Expired - Lifetime
- 1982-01-12 GB GB8200798A patent/GB2093611B/en not_active Expired
- 1982-01-13 FR FR8200461A patent/FR2497989A1/fr active Granted
- 1982-01-13 DE DE3200778A patent/DE3200778C2/de not_active Expired
- 1982-01-14 NL NL8200143A patent/NL8200143A/nl not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NL8200143A (nl) | 1982-08-02 |
| GB2093611B (en) | 1984-09-19 |
| DE3200778C2 (de) | 1983-10-06 |
| GB2093611A (en) | 1982-09-02 |
| FR2497989B1 (US06277897-20010821-C00009.png) | 1985-05-10 |
| JPS57120237A (en) | 1982-07-27 |
| US4426690A (en) | 1984-01-17 |
| FR2497989A1 (fr) | 1982-07-16 |
| DE3200778A1 (de) | 1982-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |