CA1026461A - Apparatus for recording and/or reproducing information signals - Google Patents
Apparatus for recording and/or reproducing information signalsInfo
- Publication number
- CA1026461A CA1026461A CA201,997A CA201997A CA1026461A CA 1026461 A CA1026461 A CA 1026461A CA 201997 A CA201997 A CA 201997A CA 1026461 A CA1026461 A CA 1026461A
- Authority
- CA
- Canada
- Prior art keywords
- recording
- information signals
- reproducing information
- reproducing
- signals
- 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
- G11B7/09—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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48065663A JPS5016423A (no) | 1973-06-11 | 1973-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1026461A true CA1026461A (en) | 1978-02-14 |
Family
ID=13293443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA201,997A Expired CA1026461A (en) | 1973-06-11 | 1974-06-10 | Apparatus for recording and/or reproducing information signals |
Country Status (8)
Country | Link |
---|---|
US (1) | US3925603A (no) |
JP (1) | JPS5016423A (no) |
CA (1) | CA1026461A (no) |
DE (1) | DE2427971A1 (no) |
FR (1) | FR2232813B1 (no) |
GB (1) | GB1468253A (no) |
IT (1) | IT1014974B (no) |
NL (1) | NL7407749A (no) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2280150B1 (fr) * | 1974-07-26 | 1977-01-07 | Thomson Brandt | Dispositif de detection d'ecart de mise au point d'une tete de lecture optique par rapport a une surface de lecture |
US4025949A (en) * | 1975-12-31 | 1977-05-24 | Zenith Radio Corporation | Symmetrical astigmatic focus sensing system |
US4305081A (en) * | 1976-03-19 | 1981-12-08 | Rca Corporation | Multilayer record blank for use in optical recording |
US4071751A (en) * | 1976-04-26 | 1978-01-31 | Rca Limited | Automatic optical bias control for light modulators |
JPS54133305A (en) * | 1978-04-07 | 1979-10-17 | Hitachi Ltd | Information recorder |
US4287410A (en) * | 1979-02-28 | 1981-09-01 | Sri International | Double Purkinje eye tracker |
US4322838A (en) * | 1980-02-11 | 1982-03-30 | Hewlett-Packard Company | Dynamic focus adjustment for transmissive or reflective optical disc memory systems |
US4357533A (en) * | 1980-07-14 | 1982-11-02 | Discovision Associates | Focus detector for an optical disc playback system |
JPS5737742A (en) * | 1980-08-19 | 1982-03-02 | Olympus Optical Co Ltd | Method and device for optical information recording |
JPS57114112A (en) * | 1981-01-06 | 1982-07-15 | Canon Inc | Image reader |
US4402061A (en) * | 1981-10-15 | 1983-08-30 | Burroughs Corporation | Preformatted optical media for use in an optical memory system |
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 |
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 |
US4888759A (en) * | 1982-09-09 | 1989-12-19 | Burroughs Corporation | Laser optical memory system having beam combining and separating apparatus for combining and separating reading and writing laser beams |
US4621353A (en) * | 1982-09-09 | 1986-11-04 | Burroughs Corporation | Optical memory system providing improved focusing control and improved beam combining and separating apparatus |
FR2536568A1 (fr) * | 1982-11-18 | 1984-05-25 | Sony Corp | Appareil de detection de la position d'un lecteur optique |
US4579454A (en) * | 1983-03-14 | 1986-04-01 | Rca Corporation | Optical profilometer for steep surface contours with significant surface tilt |
JPS59163943U (ja) * | 1983-04-18 | 1984-11-02 | パイオニア株式会社 | 光軸モニタ装置 |
AU575332B2 (en) * | 1983-07-29 | 1988-07-28 | Sony Corporation | Optical disk pick-up |
US4742218A (en) * | 1985-03-11 | 1988-05-03 | Hitachi, Ltd. | Focus error detection apparatus utilizing focusing an front and rear sides of focal planes |
JPH0610694B2 (ja) * | 1985-04-12 | 1994-02-09 | 株式会社日立製作所 | 自動焦点合せ方法及び装置 |
JPS6282525A (ja) * | 1985-10-08 | 1987-04-16 | Toshiba Corp | 光学ヘツド |
US4827365A (en) * | 1987-07-24 | 1989-05-02 | Olympus Optical Co., Inc. | Assembly for accessing information recording medium |
EP0322356A3 (de) * | 1987-12-19 | 1991-06-12 | Baumer Electric Ag | Verfahren und Vorrichtung zur optischen Distanzmessung |
JP2725313B2 (ja) * | 1988-10-21 | 1998-03-11 | 松下電器産業株式会社 | 電池外装体 |
KR100885328B1 (ko) | 2001-08-02 | 2009-02-26 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | 알루미나-산화 이트륨-산화 지르코늄/산화 하프늄 물질,및 그의 제조 및 사용 방법 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS42196Y1 (no) * | 1966-04-22 | 1967-01-09 | ||
US3596101A (en) * | 1969-11-05 | 1971-07-27 | Canon Kk | Optical systems for automatic focusing apparatus |
US3635551A (en) * | 1970-05-18 | 1972-01-18 | Gaf Corp | Automatic focusing system for projectors and the like |
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. |
AR205243A1 (es) * | 1972-05-11 | 1976-04-21 | Philips Nv | Aparato para la lectura de un portador de grabacion reflector plano |
JPS5847770B2 (ja) * | 1973-04-26 | 1983-10-25 | 松下電器産業株式会社 | ジドウシヨウテンイチケンシユツソウチ |
-
1973
- 1973-06-11 JP JP48065663A patent/JPS5016423A/ja active Pending
-
1974
- 1974-06-03 US US476153A patent/US3925603A/en not_active Expired - Lifetime
- 1974-06-05 GB GB2496974A patent/GB1468253A/en not_active Expired
- 1974-06-10 NL NL7407749A patent/NL7407749A/xx not_active Application Discontinuation
- 1974-06-10 DE DE19742427971 patent/DE2427971A1/de active Granted
- 1974-06-10 CA CA201,997A patent/CA1026461A/en not_active Expired
- 1974-06-11 IT IT23876/74A patent/IT1014974B/it active
- 1974-06-11 FR FR7420211A patent/FR2232813B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2232813B1 (no) | 1977-10-07 |
DE2427971A1 (de) | 1975-01-02 |
FR2232813A1 (no) | 1975-01-03 |
JPS5016423A (no) | 1975-02-21 |
GB1468253A (en) | 1977-03-23 |
IT1014974B (it) | 1977-04-30 |
US3925603A (en) | 1975-12-09 |
DE2427971C2 (no) | 1982-04-08 |
NL7407749A (no) | 1974-12-13 |
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