FR2497989A1 - Dispositif de reproduction optique avec asservissement de la mise au point - Google Patents
Dispositif de reproduction optique avec asservissement de la mise au point Download PDFInfo
- Publication number
- FR2497989A1 FR2497989A1 FR8200461A FR8200461A FR2497989A1 FR 2497989 A1 FR2497989 A1 FR 2497989A1 FR 8200461 A FR8200461 A FR 8200461A FR 8200461 A FR8200461 A FR 8200461A FR 2497989 A1 FR2497989 A1 FR 2497989A1
- Authority
- FR
- France
- Prior art keywords
- circuit
- signal
- output signal
- bridge
- winding
- 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
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 (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56004165A JPS57120237A (en) | 1981-01-14 | 1981-01-14 | Optical reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2497989A1 true FR2497989A1 (fr) | 1982-07-16 |
FR2497989B1 FR2497989B1 (US07534539-20090519-C00439.png) | 1985-05-10 |
Family
ID=11577124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8200461A Granted FR2497989A1 (fr) | 1981-01-14 | 1982-01-13 | Dispositif de reproduction optique avec asservissement de la mise au point |
Country Status (7)
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095852A1 (en) * | 1982-05-19 | 1983-12-07 | BURROUGHS CORPORATION (a Michigan corporation) | Focusing control circuitry for an optical memory system |
Families Citing this family (8)
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 |
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 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2296330A1 (fr) * | 1974-12-23 | 1976-07-23 | Philips Nv | Dispositif pour la lecture par voie optique d'un porteur d'enregistrement reflecteur plan |
GB2027881A (en) * | 1978-07-19 | 1980-02-27 | Universal Pioneer Corp | In-focus detecting device |
DE2935249A1 (de) * | 1978-09-07 | 1980-03-13 | Universal Pioneer Corp | Servo-antriebseinrichtung fuer eine fokussierlinse |
DE3048708A1 (de) * | 1979-12-28 | 1981-10-15 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka | Servosteuersystem fuer optisches lesen und aufzeichnen |
-
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
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2296330A1 (fr) * | 1974-12-23 | 1976-07-23 | Philips Nv | Dispositif pour la lecture par voie optique d'un porteur d'enregistrement reflecteur plan |
GB2027881A (en) * | 1978-07-19 | 1980-02-27 | Universal Pioneer Corp | In-focus detecting device |
DE2935249A1 (de) * | 1978-09-07 | 1980-03-13 | Universal Pioneer Corp | Servo-antriebseinrichtung fuer eine fokussierlinse |
DE3048708A1 (de) * | 1979-12-28 | 1981-10-15 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka | Servosteuersystem fuer optisches lesen und aufzeichnen |
Non-Patent Citations (1)
Title |
---|
NEUES AUS DER TECHNIK, année 1979, no. 1, 15 février 1979, page 1, W}rzburg, DE * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095852A1 (en) * | 1982-05-19 | 1983-12-07 | BURROUGHS CORPORATION (a Michigan corporation) | Focusing control circuitry for an optical memory system |
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 (US07534539-20090519-C00439.png) | 1985-05-10 |
CA1191949A (en) | 1985-08-13 |
JPS57120237A (en) | 1982-07-27 |
US4426690A (en) | 1984-01-17 |
DE3200778A1 (de) | 1982-12-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |