Apparatus for aligning optical axis of optical pick-up
US5717666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Apr 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0956
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical axis alignment apparatus of an optical pick-up device for measuring and adjusting a shift amount between a central axis of an objective lens and an optical axis of a laser beam emitted from a light source includes a first photodetector positioned to reciprocate along a central axis of the objective lens, for detecting a shift amount of an optical axis of the laser beam with respect to the central axis of the objective lens and for generating a first detection signal; a second photodetector for detecting a distribution of the laser beam emitted from the laser source and for generating a second detection signal; a beam splitter for splitting the laser beam at a predetermined angle to direct the laser beam to said first and said second photodetectors, respectively; a driving mechanism for reciprocating the first photodetector along the central axis of the objective lens; and mechanism for adjusting the position and the angle of the laser source in dependence upon reception of the first and second detection signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.