GB1479294A - Optical recording - Google Patents
Optical recordingInfo
- Publication number
- GB1479294A GB1479294A GB28824/74A GB2882474A GB1479294A GB 1479294 A GB1479294 A GB 1479294A GB 28824/74 A GB28824/74 A GB 28824/74A GB 2882474 A GB2882474 A GB 2882474A GB 1479294 A GB1479294 A GB 1479294A
- Authority
- GB
- United Kingdom
- Prior art keywords
- areas
- recorded
- playback
- recorded areas
- radiation
- 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
- G11B7/24—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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
1479294 Optical recording PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 28 June 1974 [2 July 1973] 28824/74 Heading G5R In an optical record and playback arrangement for disc records in which the track width is less than the diameter of the radiation playback spot and in which the average number of recorded areas g per unit length of track varies e.g. as in a video disc with a frame recorded in each turn of the track, the width of the recorded areas is increased in proportion to the increase in said average number. The arrangement is particularly described with reference to a reflecting optical record of the type having areas g which vary in length with the recorded information and which are depressed wavelength of the playback radiation so that an antiphase radiation is produced in the playback detector as an area g is scanned in cancelling relationship to that reflected from the land 3 between tracks and the space t between recorded areas. As the length of the recorded areas decreases the average amplitude variation of the detected signal also varies so the width of the areas j is increased to compensate. In addition the non-linearity evidenced by the detector signal dropping to more than half the difference between maximum and minimum before the start of an area reaches the mid point of the playback spot, is compensated by shaping of the leading and trailing ends of the recorded areas. Figs. 9 and 10 (not shown). Recording apparatus for the disc for producing these changes in the shape of the recorded areas is described Fig. 11 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7309174,A NL172111C (en) | 1973-07-02 | 1973-07-02 | REGISTRATION CARRIER ON WHICH INFORMATION IS STORED IN AN OPTICAL STRUCTURE AND DEVICE FOR REGISTERING SUCH REGISTRATION CARRIER. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1479294A true GB1479294A (en) | 1977-07-13 |
Family
ID=19819188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28824/74A Expired GB1479294A (en) | 1973-07-02 | 1974-06-28 | Optical recording |
Country Status (16)
Country | Link |
---|---|
JP (1) | JPS5623221B2 (en) |
AT (1) | AT346096B (en) |
BE (1) | BE817188A (en) |
BR (1) | BR7405448D0 (en) |
CA (1) | CA1039402A (en) |
CH (1) | CH592349A5 (en) |
DE (1) | DE2429850C2 (en) |
DK (1) | DK137735B (en) |
ES (1) | ES427804A1 (en) |
FR (1) | FR2236240B1 (en) |
GB (1) | GB1479294A (en) |
IT (1) | IT1014438B (en) |
NL (1) | NL172111C (en) |
NO (1) | NO144551C (en) |
SE (1) | SE402368B (en) |
ZA (1) | ZA744185B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4125859A (en) * | 1975-10-31 | 1978-11-14 | Hitachi, Ltd. | Videodisc play-back apparatus with variable width beam |
US4142210A (en) * | 1976-11-18 | 1979-02-27 | Sony Corporation | Rotatable record carrier and method and apparatus for producing same |
US4157568A (en) * | 1976-11-30 | 1979-06-05 | Sony Corporation | Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7506495A (en) * | 1975-06-02 | 1976-12-06 | Philips Nv | DEVICE FOR READING A REGISTRATION MEDIA. |
JPS5242034U (en) * | 1975-09-18 | 1977-03-25 | ||
US4097895A (en) * | 1976-03-19 | 1978-06-27 | Rca Corporation | Multilayer optical record |
JPS54141604A (en) * | 1978-04-27 | 1979-11-05 | Nippon Columbia | Optical disk and method of fabricating original disk of optical disk |
CH636467A5 (en) * | 1978-10-17 | 1983-05-31 | Mca Disco Vision | Method and device for recording a modulated electrical signal |
NL7902363A (en) * | 1979-03-27 | 1980-09-30 | Philips Nv | RECORD CARRIER WITH AN OPTICALLY READABLE INFORMASTRUCTURE. |
JPH0335455Y2 (en) * | 1986-01-10 | 1991-07-26 |
-
1973
- 1973-07-02 NL NLAANVRAGE7309174,A patent/NL172111C/en not_active IP Right Cessation
-
1974
- 1974-06-21 DE DE2429850A patent/DE2429850C2/en not_active Expired
- 1974-06-28 SE SE7408535A patent/SE402368B/en unknown
- 1974-06-28 ES ES427804A patent/ES427804A1/en not_active Expired
- 1974-06-28 DK DK351274AA patent/DK137735B/en not_active IP Right Cessation
- 1974-06-28 ZA ZA00744185A patent/ZA744185B/en unknown
- 1974-06-28 AT AT538774A patent/AT346096B/en not_active IP Right Cessation
- 1974-06-28 GB GB28824/74A patent/GB1479294A/en not_active Expired
- 1974-06-28 NO NO742366A patent/NO144551C/en unknown
- 1974-07-01 IT IT69079/74A patent/IT1014438B/en active
- 1974-07-01 CH CH899674A patent/CH592349A5/xx not_active IP Right Cessation
- 1974-07-02 CA CA203,876A patent/CA1039402A/en not_active Expired
- 1974-07-02 BR BR5448/74A patent/BR7405448D0/en unknown
- 1974-07-02 BE BE146165A patent/BE817188A/en not_active IP Right Cessation
- 1974-07-02 JP JP7577874A patent/JPS5623221B2/ja not_active Expired
- 1974-07-02 FR FR7422976A patent/FR2236240B1/fr not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4125859A (en) * | 1975-10-31 | 1978-11-14 | Hitachi, Ltd. | Videodisc play-back apparatus with variable width beam |
US4142210A (en) * | 1976-11-18 | 1979-02-27 | Sony Corporation | Rotatable record carrier and method and apparatus for producing same |
US4157568A (en) * | 1976-11-30 | 1979-06-05 | Sony Corporation | Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size |
Also Published As
Publication number | Publication date |
---|---|
NO144551B (en) | 1981-06-09 |
FR2236240B1 (en) | 1979-08-24 |
AT346096B (en) | 1978-10-25 |
ATA538774A (en) | 1978-02-15 |
NO742366L (en) | 1975-01-27 |
ES427804A1 (en) | 1976-08-01 |
NL7309174A (en) | 1975-01-06 |
NL172111C (en) | 1983-07-01 |
JPS5034508A (en) | 1975-04-02 |
DK351274A (en) | 1975-02-24 |
SE402368B (en) | 1978-06-26 |
ZA744185B (en) | 1976-02-25 |
CH592349A5 (en) | 1977-10-31 |
DE2429850C2 (en) | 1982-11-18 |
IT1014438B (en) | 1977-04-20 |
BE817188A (en) | 1975-01-02 |
JPS5623221B2 (en) | 1981-05-29 |
DK137735C (en) | 1978-10-02 |
NL172111B (en) | 1983-02-01 |
CA1039402A (en) | 1978-09-26 |
SE7408535L (en) | 1975-01-03 |
NO144551C (en) | 1981-09-16 |
DE2429850A1 (en) | 1975-01-30 |
BR7405448D0 (en) | 1975-04-15 |
AU7074274A (en) | 1976-01-08 |
DK137735B (en) | 1978-04-24 |
FR2236240A1 (en) | 1975-01-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |