Laser beam recording system
US4340894A · kind A · utility
4Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1980 |
| Grant date | Jul 20, 1982 |
| Priority date | — |
| Expiry date | Jul 14, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/036
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a laser beam recording system in which a laser beam is modulated by an acousto-optic modulator and the zero-order diffraction light beam is used to scan a recording material two-dimensionally for recording information, the zero-order diffraction light beam is vertically deflected to a light shielding mask located outside the recording area in the non-recording period. Thus, the horizontal scanning line is moved to the light shielding mask during the non-recording period and the recording material is prevented from being exposed to the attenuated zero-order diffraction light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.