Optical head device having positionally adjustable parts
US4797545A · kind A · utility
6Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Apr 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13925
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical head device, the distance between a light source, such as a semiconductor laser, and a condensing lens is altered along the optical axis thereof, so that the resulting spherical aberration may offset any component of spherical aberration that exists in an optical system as an inherent defect, whereby the wave-front aberration of the beam concentrated through the condensing lens is reduced. The device, therefore, includes an optical condensing system of improved aberration and condensation property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.