Recording optical system
US4253724A · kind A · utility
28Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Apr 20, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording optical system comprising a semi-conductor laser of substantially single mode as the light source, an objective lens of which the focal point is located substantially at the beam divergent position of said semi-conductor laser in a plane perpendicular to the junction plane thereof, an afocal cylindrical lens composed of an element having a refractive power only in a plane parallel to said junction plane, an imaging lens, an aperture limiting the beam entering said imaging lens, and a photosensitive medium positioned in the vicinity of the focal point of said imaging lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.