IT1055669B - Apparecchio per la lettura di informatione ad esempio informazioni video od audio portate da un supparto con struttura otticamente leggibile - Google Patents
Apparecchio per la lettura di informatione ad esempio informazioni video od audio portate da un supparto con struttura otticamente leggibileInfo
- Publication number
- IT1055669B IT1055669B IT69768/75A IT6976875A IT1055669B IT 1055669 B IT1055669 B IT 1055669B IT 69768/75 A IT69768/75 A IT 69768/75A IT 6976875 A IT6976875 A IT 6976875A IT 1055669 B IT1055669 B IT 1055669B
- Authority
- IT
- Italy
- Prior art keywords
- support
- carried out
- optically readable
- example video
- audio information
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
-
- 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
-
- 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
- G11B7/0916—Foucault or knife-edge methods
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1359—Single prisms
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7414776A NL7414776A (nl) | 1974-11-13 | 1974-11-13 | Inrichting voor het uitlezen van een registra- tiedrager met een optische informatiestruktuur. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT1055669B true IT1055669B (it) | 1982-01-11 |
Family
ID=19822456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT69768/75A IT1055669B (it) | 1974-11-13 | 1975-11-10 | Apparecchio per la lettura di informatione ad esempio informazioni video od audio portate da un supparto con struttura otticamente leggibile |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US3969576A (it) |
| JP (1) | JPS5171155A (it) |
| AR (1) | AR209458A1 (it) |
| AT (1) | AT345908B (it) |
| AU (1) | AU506830B2 (it) |
| BE (1) | BE835516A (it) |
| BR (1) | BR7507489A (it) |
| CA (1) | CA1070426A (it) |
| CH (1) | CH607147A5 (it) |
| DE (1) | DE2550493C3 (it) |
| DK (1) | DK140616B (it) |
| ES (1) | ES442518A1 (it) |
| FR (1) | FR2291663A1 (it) |
| GB (1) | GB1532247A (it) |
| IT (1) | IT1055669B (it) |
| NL (1) | NL7414776A (it) |
| NO (1) | NO753763L (it) |
| SE (1) | SE7512546L (it) |
| ZA (1) | ZA756971B (it) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5804814A (en) * | 1994-05-20 | 1998-09-08 | Musha; Toru | Optical pick-up head and integrated type optical unit for use in optical pick-up head |
| US4150399A (en) * | 1974-11-13 | 1979-04-17 | U.S. Philips Corporation | Apparatus for reading a record carrier with an optical information structure |
| NL7506495A (nl) * | 1975-06-02 | 1976-12-06 | Philips Nv | Inrichting voor het uitlezen van een registratie- drager. |
| FR2313716A1 (fr) * | 1975-06-03 | 1976-12-31 | Thomson Brandt | Systeme optique de lecture par reflexion d'un support d'information |
| US4125860A (en) * | 1975-06-16 | 1978-11-14 | Nippon Telegraph And Telephone Public Corporation | Reproducer for an eraseable videodisc |
| JPS5922289B2 (ja) * | 1975-11-20 | 1984-05-25 | ソニー株式会社 | ジヨウホウケンシユツソウチ |
| US4025949A (en) * | 1975-12-31 | 1977-05-24 | Zenith Radio Corporation | Symmetrical astigmatic focus sensing system |
| NL7904724A (nl) * | 1979-06-18 | 1980-12-22 | Philips Nv | Optische aftastinrichting met fokusseerstelsel. |
| FR2462758A1 (fr) * | 1979-08-03 | 1981-02-13 | Thomson Csf | Dispositif optique d'acces a une piste portee par un support d'information et systeme de memoire optique comportant un tel dispositif |
| JPS57200960A (en) * | 1981-06-04 | 1982-12-09 | Pioneer Electronic Corp | Recording and reproducing method and its device |
| JPS57200912A (en) * | 1981-06-04 | 1982-12-09 | Pioneer Electronic Corp | Information recording system |
| US4521680A (en) * | 1981-07-20 | 1985-06-04 | Tokyo Shibaura Denki Kabushiki Kaisha | System for focusing a light beam on a light reflecting surface |
| JPS5826336A (ja) * | 1981-08-06 | 1983-02-16 | Pioneer Electronic Corp | 光磁気記録方式の記録再生装置 |
| DE3280137D1 (de) * | 1981-09-17 | 1990-04-19 | Toshiba Kawasaki Kk | Ein optischer kopf. |
| JPS5849298A (ja) * | 1981-09-18 | 1983-03-23 | 旭光学工業株式会社 | フォト自動製図機における自動合焦装置 |
| JPS5870434A (ja) * | 1981-10-22 | 1983-04-26 | Toshiba Corp | 光学ヘツド |
| US4441175A (en) * | 1982-01-25 | 1984-04-03 | Magnetic Peripherals Inc. | Partial beam focus sensing in an optical recording system |
| DE3219503C2 (de) * | 1982-05-25 | 1985-08-08 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | Vorrichtung zum selbsttätigen Fokussieren auf in optischen Geräten zu betrachtende Objekte |
| US4684799A (en) * | 1983-09-19 | 1987-08-04 | Ricoh Company, Ltd. | Focus detection method involving cutting more than half of light beam reflected from disc |
| US4684797A (en) * | 1984-02-29 | 1987-08-04 | Kabushiki Kaisha Toshiba | Optical system and method for reducing vibration of an objective lens in an optical head assembly of an optical read/write system |
| US5416755A (en) * | 1985-02-28 | 1995-05-16 | Canon Kabushiki Kaisha | Optical pickup using split beams impinging on different photo-detector areas |
| JPH0693044B2 (ja) * | 1985-03-22 | 1994-11-16 | 株式会社日立製作所 | プリズム光学系及びそれを用いた情報装置 |
| NL8501489A (nl) * | 1985-05-24 | 1986-12-16 | Philips Nv | Positie-gevoelige stralingsdetector. |
| NL8603108A (nl) * | 1986-12-08 | 1988-07-01 | Philips Nv | Mikroskoop. |
| DE3787285T2 (de) * | 1987-10-19 | 1994-03-31 | Hitachi Ltd | Optischer Aufbau mit einer phasenstarr gekoppelten Laserdiodenzeile. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL160138C (nl) * | 1972-05-11 | 1979-09-17 | Philips Nv | Inrichting voor het uitlezen van een vlakke registratie- drager. |
| AR205243A1 (es) * | 1972-05-11 | 1976-04-21 | Philips Nv | Aparato para la lectura de un portador de grabacion reflector plano |
| US3829622A (en) * | 1972-10-24 | 1974-08-13 | Mca Disco Vision | Video disc player with variably biased pneumatic head |
-
1974
- 1974-11-13 NL NL7414776A patent/NL7414776A/xx not_active Application Discontinuation
-
1975
- 1975-01-22 US US05/543,111 patent/US3969576A/en not_active Expired - Lifetime
- 1975-11-06 ZA ZA756971A patent/ZA756971B/xx unknown
- 1975-11-10 AT AT853375A patent/AT345908B/de not_active IP Right Cessation
- 1975-11-10 DK DK504775AA patent/DK140616B/da unknown
- 1975-11-10 GB GB46373/75A patent/GB1532247A/en not_active Expired
- 1975-11-10 SE SE7512546A patent/SE7512546L/xx unknown
- 1975-11-10 IT IT69768/75A patent/IT1055669B/it active
- 1975-11-10 NO NO753763A patent/NO753763L/no unknown
- 1975-11-10 CA CA239,302A patent/CA1070426A/en not_active Expired
- 1975-11-11 CH CH1457175A patent/CH607147A5/xx not_active IP Right Cessation
- 1975-11-11 ES ES442518A patent/ES442518A1/es not_active Expired
- 1975-11-11 DE DE2550493A patent/DE2550493C3/de not_active Expired
- 1975-11-12 FR FR7534442A patent/FR2291663A1/fr not_active Withdrawn
- 1975-11-12 JP JP50135250A patent/JPS5171155A/ja active Pending
- 1975-11-12 BE BE161819A patent/BE835516A/xx unknown
- 1975-11-12 AU AU86527/75A patent/AU506830B2/en not_active Expired
- 1975-11-12 BR BR7507489A patent/BR7507489A/pt unknown
- 1975-11-13 AR AR261189A patent/AR209458A1/es active
Also Published As
| Publication number | Publication date |
|---|---|
| ZA756971B (en) | 1977-06-29 |
| ATA853375A (de) | 1978-02-15 |
| DK140616C (it) | 1980-02-25 |
| BE835516A (fr) | 1976-05-12 |
| DE2550493C3 (de) | 1978-07-27 |
| BR7507489A (pt) | 1976-08-31 |
| AT345908B (de) | 1978-10-10 |
| CA1070426A (en) | 1980-01-22 |
| NL7414776A (nl) | 1976-05-17 |
| DK140616B (da) | 1979-10-08 |
| DE2550493B2 (de) | 1977-12-01 |
| AR209458A1 (es) | 1977-04-29 |
| FR2291663A1 (fr) | 1976-06-11 |
| CH607147A5 (it) | 1978-11-30 |
| AU8652775A (en) | 1977-05-19 |
| US3969576A (en) | 1976-07-13 |
| DK504775A (it) | 1976-05-14 |
| JPS5171155A (it) | 1976-06-19 |
| SE7512546L (sv) | 1976-05-14 |
| AU506830B2 (en) | 1980-01-24 |
| NO753763L (it) | 1976-05-14 |
| DE2550493A1 (de) | 1976-06-10 |
| GB1532247A (en) | 1978-11-15 |
| ES442518A1 (es) | 1977-04-16 |
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