NL8200143A - Optische uitleesinrichting. - Google Patents
Optische uitleesinrichting. Download PDFInfo
- Publication number
- NL8200143A NL8200143A NL8200143A NL8200143A NL8200143A NL 8200143 A NL8200143 A NL 8200143A NL 8200143 A NL8200143 A NL 8200143A NL 8200143 A NL8200143 A NL 8200143A NL 8200143 A NL8200143 A NL 8200143A
- Authority
- NL
- Netherlands
- Prior art keywords
- circuit
- reading device
- focusing lens
- capture area
- output signal
- Prior art date
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 |
| JP416581 | 1981-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL8200143A true NL8200143A (nl) | 1982-08-02 |
Family
ID=11577124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL8200143A NL8200143A (nl) | 1981-01-14 | 1982-01-14 | Optische uitleesinrichting. |
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 |
|---|---|
| GB2093611B (en) | 1984-09-19 |
| DE3200778C2 (de) | 1983-10-06 |
| GB2093611A (en) | 1982-09-02 |
| FR2497989B1 (US20030220297A1-20031127-C00074.png) | 1985-05-10 |
| CA1191949A (en) | 1985-08-13 |
| 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 |
|---|---|---|---|
| A1A | A request for search or an international-type search has been filed | ||
| BB | A search report has been drawn up | ||
| A85 | Still pending on 85-01-01 | ||
| BC | A request for examination has been filed | ||
| BV | The patent application has lapsed |