GB1108565A - Improvements in or relating to apparatus of forming depressions in a record medium - Google Patents
Improvements in or relating to apparatus of forming depressions in a record mediumInfo
- Publication number
- GB1108565A GB1108565A GB4947663A GB4947663A GB1108565A GB 1108565 A GB1108565 A GB 1108565A GB 4947663 A GB4947663 A GB 4947663A GB 4947663 A GB4947663 A GB 4947663A GB 1108565 A GB1108565 A GB 1108565A
- Authority
- GB
- United Kingdom
- Prior art keywords
- record
- dec
- mirror
- conducting plate
- modulation
- 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0025—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cylinders or cylinder-like carriers or cylindrical sections or flat carriers loaded onto a cylindrical surface, e.g. truncated cones
-
- 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
- G11B7/0045—Recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/08—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using electrostatic charge injection; Record carriers therefor
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
1,108,565. Recording process for gramophone records. ELECTRIC & MUSICAL INDUSTRIES Ltd. 14 Dec., 1964 [14 Dec., 1963], No. 49476/63. Heading G5R. A master gramophone record in the form of a layer of wax on a conducting plate is mounted on a turntable, which may be the conducting plate, and charged electrostatically, for example by electron bombardment. A laser beam is directed on to the surface by a mirror which turns slowly to scan the beam radially across the record so that the beam traces a spiral track. The beam softens the surface of the record, and the electric charge causes a depression to be formed where the surface has been softened; the depth of the depression depends on the charge and on the intensity of the beam and may be varied by varying either or both parameters. Alternatively the beam may be moved radially in accordance with the modulation. The radial movement may be caused by a mirror, a prism, a liquid medium in which an effective grating is set up ultrasonically, or a doubly refracting prism preceded by a device for rotating the plane of polarization of the light may be employed. Stereo signals may be recorded by controlling the lateral and depth modulation in response to the sum and difference signals or by using a pair of vibrating mirrors operating on a split beam. The laser may be excited continuously or in such a manner that the softening effect of its beam is effectively continuous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4947663A GB1108565A (en) | 1963-12-14 | 1963-12-14 | Improvements in or relating to apparatus of forming depressions in a record medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4947663A GB1108565A (en) | 1963-12-14 | 1963-12-14 | Improvements in or relating to apparatus of forming depressions in a record medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1108565A true GB1108565A (en) | 1968-04-03 |
Family
ID=10452475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4947663A Expired GB1108565A (en) | 1963-12-14 | 1963-12-14 | Improvements in or relating to apparatus of forming depressions in a record medium |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1108565A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0258459A1 (en) * | 1986-02-07 | 1988-03-09 | Institut Problem Modelirovania V Energetike Akademii Nauk Ukrainskoi Ssr | Optical information medium |
-
1963
- 1963-12-14 GB GB4947663A patent/GB1108565A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0258459A1 (en) * | 1986-02-07 | 1988-03-09 | Institut Problem Modelirovania V Energetike Akademii Nauk Ukrainskoi Ssr | Optical information medium |
| EP0258459A4 (en) * | 1986-02-07 | 1988-12-12 | Akad Nauk Sssr | Optical information medium. |
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