Objective lens and imaging optical system for optical information recording and readout device
US4902113A · kind A · utility
7Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Mar 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact, large-aperture objective lens for the optical memory designed as a single-element lens having aspherical surfaces on both the sides thereof and favorably corrected aberrations, and an imaging optical system having a simple composition consisting of a collimator lens designed as a single-element lens having spherical surfaces and an objective lens movable along the optical axis, and so adapted as to allow very little degradation of performance when the objective lens is shifted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.