FR2266401A1 - - Google Patents
Info
- Publication number
- FR2266401A1 FR2266401A1 FR7509070A FR7509070A FR2266401A1 FR 2266401 A1 FR2266401 A1 FR 2266401A1 FR 7509070 A FR7509070 A FR 7509070A FR 7509070 A FR7509070 A FR 7509070A FR 2266401 A1 FR2266401 A1 FR 2266401A1
- Authority
- FR
- France
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
-
- 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
- G11B7/0912—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 push-pull method
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Focusing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/454,130 US3997715A (en) | 1974-03-25 | 1974-03-25 | Focusing system for videodisc player |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2266401A1 true FR2266401A1 (US06229276-20010508-P00081.png) | 1975-10-24 |
| FR2266401B1 FR2266401B1 (US06229276-20010508-P00081.png) | 1978-11-03 |
Family
ID=23803431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7509070A Expired FR2266401B1 (US06229276-20010508-P00081.png) | 1974-03-25 | 1975-03-24 |
Country Status (8)
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2489195A1 (fr) * | 1980-09-02 | 1982-03-05 | Amada Co Ltd | Methode et appareil pour detecter la position de mise au point dans un appareil de traitement par laser |
| FR2498340A1 (fr) * | 1981-01-22 | 1982-07-23 | Olympus Optical Co | Procede et appareil de detection d'un signal d'erreur de focalisation d'un objectif |
| EP0080340A1 (en) * | 1981-11-19 | 1983-06-01 | Olympus Optical Co., Ltd. | A device for detecting the focused state of an optical system |
| EP0488585A1 (en) * | 1990-11-26 | 1992-06-03 | Ncr International Inc. | Optical scanning apparatus |
Families Citing this family (47)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1603596A (en) * | 1977-06-06 | 1981-11-25 | Mca Disco Vision | Optical transducer and focusing system |
| SE7813460L (sv) * | 1978-03-27 | 1979-09-28 | Mca Disco Vision | Videoskivspelare |
| US4439848A (en) * | 1978-03-27 | 1984-03-27 | Discovision Associates | Focusing system for video disc player |
| JPS55160336A (en) * | 1979-05-31 | 1980-12-13 | Sharp Corp | Optical information reproducing device |
| US4291958A (en) * | 1980-10-03 | 1981-09-29 | Eastman Kodak Company | Camera with electronic flash and piezoelectric lens motor |
| US4385373A (en) * | 1980-11-10 | 1983-05-24 | Eastman Kodak Company | Device for focus and alignment control in optical recording and/or playback apparatus |
| US4376303A (en) * | 1980-12-19 | 1983-03-08 | Rca Corporation | Quasi-zoom lens optical focus sensor |
| US4378491A (en) * | 1981-01-26 | 1983-03-29 | Lehman Thomas F | Optical apparatus for sensing information from a phonograph record for controlling spacing and tracking of the pick-up relative to the record |
| JPS58159248A (ja) * | 1982-03-17 | 1983-09-21 | Fujitsu Ltd | 光デイスク装置のトラツキングサ−ボ方式 |
| US4621353A (en) * | 1982-09-09 | 1986-11-04 | Burroughs Corporation | Optical memory system providing improved focusing control and improved beam combining and separating apparatus |
| US4622659A (en) * | 1982-09-09 | 1986-11-11 | Burroughs Corporation | Focus detection and control apparatus for maintaining accurate focusing in an optical memory system by detecting reflected beam diameter variations at spaced predetermined locations |
| US4559622A (en) * | 1982-09-09 | 1985-12-17 | Burroughs Corporation | Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system |
| JPS59162514A (ja) * | 1983-03-08 | 1984-09-13 | Dainippon Screen Mfg Co Ltd | 画像走査記録装置における焦点調整方法 |
| AU575332B2 (en) * | 1983-07-29 | 1988-07-28 | Sony Corporation | Optical disk pick-up |
| DE3429382A1 (de) * | 1983-08-10 | 1985-02-28 | Canon K.K., Tokio/Tokyo | Optischer kopf |
| JPS618744A (ja) * | 1984-06-22 | 1986-01-16 | Fuji Photo Film Co Ltd | 光デイスク装置のフオ−カス誤差検出装置 |
| US4798469A (en) * | 1985-10-02 | 1989-01-17 | Burke Victor B | Noncontact gage system utilizing reflected light |
| US5231621A (en) * | 1986-09-05 | 1993-07-27 | Canon Kabushiki Kaisha | Focus detector which serves to split off a portion of a detected light beam only when the detected light beam is not refocused at an expected refocus point |
| JPH0827952B2 (ja) * | 1988-02-29 | 1996-03-21 | パイオニア株式会社 | 光学式情報再生装置 |
| US4843603A (en) * | 1988-03-11 | 1989-06-27 | Optotech, Inc. | Concentric photodetector arrangement for focusing and tracking |
| US5017768A (en) * | 1988-09-14 | 1991-05-21 | Copal Company Limited | Optical focusing control apparatus |
| US6141300A (en) * | 1989-06-20 | 2000-10-31 | Discovision Associates | Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same |
| US5265079A (en) | 1991-02-15 | 1993-11-23 | Applied Magnetics Corporation | Seek actuator for optical recording |
| US6069857A (en) * | 1991-02-15 | 2000-05-30 | Discovision Associates | Optical disc system having improved circuitry for performing blank sector check on readable disc |
| US5729511A (en) | 1991-02-15 | 1998-03-17 | Discovision Associates | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal |
| US5677899A (en) | 1991-02-15 | 1997-10-14 | Discovision Associates | Method for moving carriage assembly from initial position to target position relative to storage medium |
| US6236625B1 (en) | 1991-02-15 | 2001-05-22 | Discovision Associates | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same |
| US5808980A (en) * | 1991-02-15 | 1998-09-15 | Discovision Associates | Seek actuator for optical recording |
| KR950005957B1 (ko) * | 1992-06-04 | 1995-06-07 | 주식회사금성사 | 광 픽업 시스템 |
| US6091684A (en) * | 1995-01-25 | 2000-07-18 | Discovision Associates | Optical disc system and method for changing the rotational rate of an information storage medium |
| US5920539A (en) * | 1995-01-25 | 1999-07-06 | Discovision Associates | Apparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductor |
| US6434087B1 (en) | 1995-01-25 | 2002-08-13 | Discovision Associates | Optical disc system and method for controlling bias coil and light source to process information on a storage medium |
| US5748578A (en) * | 1995-01-25 | 1998-05-05 | Discovision Associates | Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same |
| US5978329A (en) * | 1995-06-07 | 1999-11-02 | Discovision Associates | Technique for closed loop servo operation in optical disc tracking control |
| CN1077715C (zh) * | 1995-12-06 | 2002-01-09 | 迪维安公司 | 聚焦控制的装置和方法 |
| US5689485A (en) * | 1996-04-01 | 1997-11-18 | Discovision Associates | Tracking control apparatus and method |
| US6084740A (en) | 1997-12-01 | 2000-07-04 | Storage Technology Corporation | Optical servo system for a tape drive |
| US7153366B1 (en) | 1998-03-24 | 2006-12-26 | Quantum Corporation | Systems and method for forming a servo pattern on a magnetic tape |
| US7029726B1 (en) | 1999-07-27 | 2006-04-18 | Quantum Corporation | Method for forming a servo pattern on a magnetic tape |
| US6246535B1 (en) * | 1998-11-13 | 2001-06-12 | Quantum Corporation | Optical apparatus for tracking a magnetic tape |
| US20030189782A1 (en) * | 2002-04-04 | 2003-10-09 | Storage Technology Corporation | Optical servo system for a tape drive |
| US6940676B1 (en) | 2000-06-07 | 2005-09-06 | Quantum Corporation | Triple push-pull optical tracking system |
| US6980390B2 (en) | 2003-02-05 | 2005-12-27 | Quantum Corporation | Magnetic media with embedded optical servo tracks |
| US7187515B2 (en) | 2003-02-05 | 2007-03-06 | Quantum Corporation | Method and system for tracking magnetic media with embedded optical servo tracks |
| DE102010039633B4 (de) * | 2010-08-23 | 2012-06-28 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Vorrichtung und Verfahren zur Bestimmung der Fokuslage eines zur Laser-Materialbearbeitung verwendeten Laserstrahls entlang der Laserstrahlachse |
| US10215553B2 (en) | 2015-03-12 | 2019-02-26 | Apple Inc. | Thin PSD for laser-scanning systems |
| US9829445B2 (en) | 2015-12-03 | 2017-11-28 | Apple Inc. | Testing diffraction or diffusion of a light beam |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1547457A1 (de) * | 1966-01-22 | 1970-02-19 | Schneider Co Optische Werke | Verfahren und Vorrichtung zur automatischen Scharfeinstellung optischer Systeme |
| US3596101A (en) * | 1969-11-05 | 1971-07-27 | Canon Kk | Optical systems for automatic focusing apparatus |
| US3673412A (en) * | 1970-03-02 | 1972-06-27 | Trw Inc | Radiant energy beam scanning method and apparatus |
| NL172202C (nl) * | 1971-03-11 | 1983-07-18 | Philips Nv | Inrichting voor het uitlezen van een plaatvormige informatiedrager bevattende in optische vorm gecodeerde beeld- en/of geluidssignalen. |
| US3757124A (en) * | 1971-08-13 | 1973-09-04 | P Kaestner | Optical apparatus for focusing an image |
| AR205243A1 (es) * | 1972-05-11 | 1976-04-21 | Philips Nv | Aparato para la lectura de un portador de grabacion reflector plano |
-
1974
- 1974-03-25 US US05/454,130 patent/US3997715A/en not_active Expired - Lifetime
-
1975
- 1975-03-06 CA CA221,434A patent/CA1055605A/en not_active Expired
- 1975-03-20 DE DE19752512321 patent/DE2512321B2/de active Granted
- 1975-03-21 GB GB11913/75A patent/GB1502292A/en not_active Expired
- 1975-03-24 FR FR7509070A patent/FR2266401B1/fr not_active Expired
- 1975-03-24 IT IT48739/75A patent/IT1032419B/it active
- 1975-03-25 JP JP3602675A patent/JPS5423242B2/ja not_active Expired
- 1975-03-25 NL NL7503606.A patent/NL167075C/xx not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2489195A1 (fr) * | 1980-09-02 | 1982-03-05 | Amada Co Ltd | Methode et appareil pour detecter la position de mise au point dans un appareil de traitement par laser |
| FR2498340A1 (fr) * | 1981-01-22 | 1982-07-23 | Olympus Optical Co | Procede et appareil de detection d'un signal d'erreur de focalisation d'un objectif |
| EP0080340A1 (en) * | 1981-11-19 | 1983-06-01 | Olympus Optical Co., Ltd. | A device for detecting the focused state of an optical system |
| EP0488585A1 (en) * | 1990-11-26 | 1992-06-03 | Ncr International Inc. | Optical scanning apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2512321C3 (US06229276-20010508-P00081.png) | 1978-07-13 |
| JPS50130319A (US06229276-20010508-P00081.png) | 1975-10-15 |
| FR2266401B1 (US06229276-20010508-P00081.png) | 1978-11-03 |
| NL167075C (nl) | 1981-10-15 |
| GB1502292A (en) | 1978-03-01 |
| JPS5423242B2 (US06229276-20010508-P00081.png) | 1979-08-13 |
| DE2512321A1 (de) | 1975-10-02 |
| DE2512321B2 (de) | 1977-11-17 |
| NL7503606A (nl) | 1975-09-29 |
| CA1055605A (en) | 1979-05-29 |
| US3997715A (en) | 1976-12-14 |
| NL167075B (nl) | 1981-05-15 |
| IT1032419B (it) | 1979-05-30 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CD | Change of name or company name | ||
| TP | Transmission of property |