Apparatus measuring an output of a disk drive
US5237551A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Aug 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for measuring an optical output of an optical pickup device disposed in an optical disk drive unit has a dummy cartridge approximately of the same type as a disk cartridge mounted to the optical disk drive unit; a light-receiving element disposed in a predetermined position of the dummy cartridge; an optical level measuring display device for inputting the light-receiving signal thereto and displaying a measured value of the optical output; and a controller for controlling an operation of the optical disk drive unit such that this optical disk drive unit performs a predetermined operation for measuring the optical output. The above measuring apparatus may further comprise a connector device for externally outputting the light-receiving signal of the light-receiving element. In this case, the optical level measuring display device inputs the light-receiving signal thereto through the connector device. An apparatus for measuring a magnetic field distribution of a magnetic head disposed in a magnetooptic disk drive unit and generating an auxiliary magnetic field is also shown.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.