IT952934B - INFORMATION SUPPORT DISK CONTAINING SOUND OR VIDEO SIGNALS ARRANGED IN A SPIRAL, OPTICALLY CODED - Google Patents
INFORMATION SUPPORT DISK CONTAINING SOUND OR VIDEO SIGNALS ARRANGED IN A SPIRAL, OPTICALLY CODEDInfo
- Publication number
- IT952934B IT952934B IT67733/72A IT6773372A IT952934B IT 952934 B IT952934 B IT 952934B IT 67733/72 A IT67733/72 A IT 67733/72A IT 6773372 A IT6773372 A IT 6773372A IT 952934 B IT952934 B IT 952934B
- Authority
- IT
- Italy
- Prior art keywords
- spiral
- video signals
- support disk
- information support
- disk containing
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/7605—Television signal recording on discs or drums
-
- 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
-
- 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
- G11B7/12—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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
-
- 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
-
- 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
- G11B7/12—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
- G11B7/1372—Lenses
- G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Testing Of Coins (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7103233A NL7103233A (en) | 1971-03-11 | 1971-03-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT952934B true IT952934B (en) | 1973-07-30 |
Family
ID=19812661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT67733/72A IT952934B (en) | 1971-03-11 | 1972-03-08 | INFORMATION SUPPORT DISK CONTAINING SOUND OR VIDEO SIGNALS ARRANGED IN A SPIRAL, OPTICALLY CODED |
Country Status (13)
Country | Link |
---|---|
JP (1) | JPS5213733B1 (en) |
BE (1) | BE780451A (en) |
CA (1) | CA953419A (en) |
CH (1) | CH558053A (en) |
DK (1) | DK133449B (en) |
ES (2) | ES400596A1 (en) |
FR (1) | FR2129626A5 (en) |
GB (1) | GB1387304A (en) |
IT (1) | IT952934B (en) |
NL (1) | NL7103233A (en) |
NO (1) | NO138162C (en) |
SE (1) | SE396493B (en) |
ZA (1) | ZA72928B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4161752A (en) * | 1977-06-28 | 1979-07-17 | International Business Machines Corporation | High density video disk having two pit depths |
NL7803517A (en) * | 1978-04-03 | 1979-10-05 | Philips Nv | RECORD CARRIER WITH AN OPTICALLY READABLE PHASE STRUCTURE AND DEVICE FOR READING. |
FR2442487A2 (en) * | 1978-11-21 | 1980-06-20 | Thomson Brandt | Automatic focussing for optical reading of video disc - using electromagnetic assembly with windings to control lens position |
JPH0665950U (en) * | 1991-07-22 | 1994-09-16 | 勉 宮崎 | Optical reader |
FR2750528A1 (en) * | 1996-06-28 | 1998-01-02 | Thomson Multimedia Sa | OPTICAL DISC COMPATIBLE WITH TWO DIFFERENT READING SYSTEMS |
-
1971
- 1971-03-11 NL NL7103233A patent/NL7103233A/xx unknown
-
1972
- 1972-02-14 ZA ZA720928A patent/ZA72928B/en unknown
- 1972-03-08 IT IT67733/72A patent/IT952934B/en active
- 1972-03-08 DK DK107272AA patent/DK133449B/en not_active IP Right Cessation
- 1972-03-08 GB GB1079172A patent/GB1387304A/en not_active Expired
- 1972-03-08 CA CA136,517A patent/CA953419A/en not_active Expired
- 1972-03-08 SE SE7202924A patent/SE396493B/en unknown
- 1972-03-08 JP JP47023275A patent/JPS5213733B1/ja active Pending
- 1972-03-08 NO NO740/72A patent/NO138162C/en unknown
- 1972-03-08 CH CH336872A patent/CH558053A/en not_active IP Right Cessation
- 1972-03-09 ES ES400596A patent/ES400596A1/en not_active Expired
- 1972-03-09 BE BE780451A patent/BE780451A/en not_active IP Right Cessation
- 1972-03-13 FR FR7208626A patent/FR2129626A5/fr not_active Expired
-
1974
- 1974-07-01 ES ES427857A patent/ES427857A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DK133449C (en) | 1977-03-14 |
ES400596A1 (en) | 1975-07-16 |
GB1387304A (en) | 1975-03-12 |
DE2209761B2 (en) | 1976-02-12 |
NO138162B (en) | 1978-04-03 |
NL7103233A (en) | 1972-09-13 |
CA953419A (en) | 1974-08-20 |
SE396493B (en) | 1977-09-19 |
JPS5213733B1 (en) | 1977-04-16 |
CH558053A (en) | 1975-01-15 |
BE780451A (en) | 1972-09-11 |
NO138162C (en) | 1978-07-12 |
ZA72928B (en) | 1973-09-26 |
DK133449B (en) | 1976-05-17 |
FR2129626A5 (en) | 1972-10-27 |
DE2209761A1 (en) | 1972-09-21 |
ES427857A1 (en) | 1977-07-01 |
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