GB1475179A - Optical scanning - Google Patents
Optical scanningInfo
- Publication number
- GB1475179A GB1475179A GB4509174A GB4509174A GB1475179A GB 1475179 A GB1475179 A GB 1475179A GB 4509174 A GB4509174 A GB 4509174A GB 4509174 A GB4509174 A GB 4509174A GB 1475179 A GB1475179 A GB 1475179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- track
- spots
- spot
- information
- carrier
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
-
- 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
- G11B7/0901—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 track following only
- G11B7/0903—Multi-beam tracking systems
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7314464A NL7314464A (nl) | 1973-10-20 | 1973-10-20 | Inrichting voor het optisch aftasten van een informa- tiespoor op een roterende informatiedrager. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1475179A true GB1475179A (en) | 1977-06-01 |
Family
ID=19819855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4509174A Expired GB1475179A (en) | 1973-10-20 | 1974-10-17 | Optical scanning |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5068731A (xx) |
| AT (1) | AT339390B (xx) |
| BE (1) | BE821269A (xx) |
| BR (1) | BR7408645D0 (xx) |
| CA (1) | CA1040741A (xx) |
| CH (1) | CH574151A5 (xx) |
| DE (1) | DE2448792A1 (xx) |
| DK (1) | DK545474A (xx) |
| ES (1) | ES431129A1 (xx) |
| FR (1) | FR2248569B1 (xx) |
| GB (1) | GB1475179A (xx) |
| IT (1) | IT1024629B (xx) |
| NL (1) | NL7314464A (xx) |
| NO (1) | NO743762L (xx) |
| SE (1) | SE7413069L (xx) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270990A (en) * | 1986-08-15 | 1993-12-14 | Canon Kabushiki Kaisha | Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams |
-
1973
- 1973-10-20 NL NL7314464A patent/NL7314464A/xx not_active Application Discontinuation
-
1974
- 1974-10-12 DE DE19742448792 patent/DE2448792A1/de not_active Withdrawn
- 1974-10-17 AT AT835874A patent/AT339390B/de not_active IP Right Cessation
- 1974-10-17 BR BR8645/74A patent/BR7408645D0/pt unknown
- 1974-10-17 SE SE7413069A patent/SE7413069L/xx unknown
- 1974-10-17 JP JP49118787A patent/JPS5068731A/ja active Pending
- 1974-10-17 DK DK545474A patent/DK545474A/da unknown
- 1974-10-17 CH CH1394474A patent/CH574151A5/xx not_active IP Right Cessation
- 1974-10-17 CA CA211,612A patent/CA1040741A/en not_active Expired
- 1974-10-17 GB GB4509174A patent/GB1475179A/en not_active Expired
- 1974-10-17 IT IT70103/74A patent/IT1024629B/it active
- 1974-10-17 NO NO743762A patent/NO743762L/no unknown
- 1974-10-18 ES ES431129A patent/ES431129A1/es not_active Expired
- 1974-10-18 BE BE149705A patent/BE821269A/xx unknown
- 1974-10-21 FR FR7435270A patent/FR2248569B1/fr not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270990A (en) * | 1986-08-15 | 1993-12-14 | Canon Kabushiki Kaisha | Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams |
Also Published As
| Publication number | Publication date |
|---|---|
| NO743762L (xx) | 1975-05-20 |
| ATA835874A (de) | 1977-02-15 |
| AT339390B (de) | 1977-10-10 |
| NL7314464A (nl) | 1975-04-22 |
| IT1024629B (it) | 1978-07-20 |
| CH574151A5 (xx) | 1976-03-31 |
| FR2248569B1 (xx) | 1979-08-24 |
| ES431129A1 (es) | 1976-11-01 |
| BE821269A (fr) | 1975-04-18 |
| AU7442874A (en) | 1976-04-29 |
| DE2448792A1 (de) | 1975-05-28 |
| CA1040741A (en) | 1978-10-17 |
| JPS5068731A (xx) | 1975-06-09 |
| DK545474A (xx) | 1975-06-30 |
| BR7408645D0 (pt) | 1975-08-05 |
| SE7413069L (xx) | 1975-04-21 |
| FR2248569A1 (xx) | 1975-05-16 |
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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 |