Apparatus for measuring degree of inclination of objective lens for optical pickup
US5742383A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Nov 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring the degree of inclination of an objective lens for an optical pickup is provided. The apparatus for measuring the degree of inclination of the objective lens includes a light source, a collimator positioned between the light source and the objective lens, for collimating light emitted from the light source, a condensing lens for converging light passed through the collimator on the objective lens, a light receiving element for receiving light passed through the condensing lens after being reflected from the objective lens, and an optical path converting portion positioned along the optical path between the collimator and the condensing lens, for directing part of the light entering the optical path converting portion from the light source to travel toward the condensing lens and directing the remaining light toward the light receiving element, wherein a difference between the location of the light directly entering the light receiving element after being emitted from the optical path converting portion and the location of the light entering the light receiving element after being reflected from the objective lens is detected to measure the degree of incli…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.