IT1031406B - Video disco perfezionato - Google Patents
Video disco perfezionatoInfo
- Publication number
- IT1031406B IT1031406B IT19887/75A IT1988775A IT1031406B IT 1031406 B IT1031406 B IT 1031406B IT 19887/75 A IT19887/75 A IT 19887/75A IT 1988775 A IT1988775 A IT 1988775A IT 1031406 B IT1031406 B IT 1031406B
- Authority
- IT
- Italy
- Prior art keywords
- video disc
- improved video
- improved
- disc
- video
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
-
- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
- G11B7/0051—Reproducing involving phase depth effects
-
- 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
- G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/439,680 US3931459A (en) | 1974-02-04 | 1974-02-04 | Video disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT1031406B true IT1031406B (it) | 1979-04-30 |
Family
ID=23745705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT19887/75A IT1031406B (it) | 1974-02-04 | 1975-02-03 | Video disco perfezionato |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3931459A (en, 2012) |
| DE (1) | DE2504571C2 (en, 2012) |
| FR (1) | FR2260164B1 (en, 2012) |
| GB (1) | GB1501454A (en, 2012) |
| IT (1) | IT1031406B (en, 2012) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160269A (en) * | 1971-03-04 | 1979-07-03 | U.S. Philips Corporation | Apparatus for optically reading a phase-modulated optical record carrier |
| US4041530A (en) * | 1971-03-04 | 1977-08-09 | U.S. Philips Corporation | Video disc with phase structure |
| FR2288370A1 (fr) * | 1974-10-18 | 1976-05-14 | Thomson Brandt | Perfectionnements aux supports d'information a lecture optique |
| FR2306495A1 (fr) * | 1975-04-04 | 1976-10-29 | Thomson Brandt | Systeme de lecture d'un enregistrement par exploration optique ponctuelle d'une piste diffractante |
| US4065786A (en) * | 1975-09-30 | 1977-12-27 | Rca Corporation | Videodisc playback system |
| US4097895A (en) | 1976-03-19 | 1978-06-27 | Rca Corporation | Multilayer optical record |
| JPS5398802A (en) * | 1977-02-09 | 1978-08-29 | Mitsubishi Electric Corp | Optical reproducer |
| NL7809227A (nl) * | 1978-09-11 | 1980-03-13 | Philips Nv | Registratiedrager met een optisch uitleesbare, stra- lingsreflekterende informatiestruktuur. |
| NL7810462A (nl) * | 1978-10-19 | 1980-04-22 | Philips Nv | Registratiedrager waarin informatie is aangebracht in een optisch uitleesbare stralingsreflekterende informatiestruktuur |
| NL7810463A (nl) * | 1978-10-19 | 1980-04-22 | Philips Nv | Registratiedrager waarin informatie is aangebracht in een optisch uitleesbare informatiestruktuur. |
| US4232337A (en) * | 1978-12-13 | 1980-11-04 | Mca Discovision, Inc. | Method and apparatus for tracking an optically readable information track |
| JPS55142424A (en) * | 1979-04-18 | 1980-11-07 | Ibm | Sensor for optical data memory |
| NL8005633A (nl) * | 1980-10-13 | 1982-05-03 | Philips Nv | Inrichting voor het uitlezen en/of inschrijven van een optisch uitleesbare informatiestruktuur. |
| JPS5774846A (en) * | 1980-10-28 | 1982-05-11 | Toshiba Corp | Information storing medium |
| US4385372A (en) * | 1981-05-01 | 1983-05-24 | Drexler Technology Corporation | Reflective optical data storage and laser recording media having grooved dielectric encoded prerecorded information |
| JPS5862842A (ja) * | 1981-10-09 | 1983-04-14 | Matsushita Electric Ind Co Ltd | 光学的記録用円盤 |
| JP2569005B2 (ja) * | 1986-03-31 | 1997-01-08 | 株式会社日立製作所 | 光ディスク装置および光ディスク |
| US4999234A (en) * | 1987-08-10 | 1991-03-12 | Polaroid Corporation | Holographic optical data storage medium |
| JPH0253237A (ja) * | 1988-08-16 | 1990-02-22 | Ricoh Co Ltd | 光学式情報記録媒体 |
| BR9611537A (pt) * | 1995-09-29 | 2000-04-25 | Sage Technology Inc | Sistema e processo para codificar regiões de dados em meios óticos |
| US6842409B2 (en) * | 2001-02-21 | 2005-01-11 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
| US6680898B2 (en) * | 2001-02-21 | 2004-01-20 | Todd J. Kuchman | Optical disc and method of protecting same |
| US20060050621A1 (en) * | 2002-10-15 | 2006-03-09 | Liedenbaum Coen Theodorus Hube | Optical scanning device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3361873A (en) * | 1962-05-07 | 1968-01-02 | Minnesota Mining & Mfg | Disc recording system |
| US3688025A (en) * | 1970-10-27 | 1972-08-29 | Rca Corp | Recorder and playback apparatus for pulse width modulated record |
-
1974
- 1974-02-04 US US05/439,680 patent/US3931459A/en not_active Expired - Lifetime
-
1975
- 1975-01-28 FR FR7502597A patent/FR2260164B1/fr not_active Expired
- 1975-02-03 GB GB4612/75A patent/GB1501454A/en not_active Expired
- 1975-02-03 IT IT19887/75A patent/IT1031406B/it active
- 1975-02-04 DE DE2504571A patent/DE2504571C2/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2504571C2 (de) | 1982-12-02 |
| GB1501454A (en) | 1978-02-15 |
| FR2260164A1 (en, 2012) | 1975-08-29 |
| FR2260164B1 (en, 2012) | 1979-01-05 |
| US3931459A (en) | 1976-01-06 |
| DE2504571A1 (de) | 1975-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19940131 |