Storage medium track pitch detector
US4648084A · kind A · utility
7Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1985 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00375
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for measuring the spacing between adjacent information tracks on a recording medium. A spot of light is projected onto at least a portion of a first track and maintained in a constant spacing from a second track. A photodetector detects the amount of light reflected off of the disc from the spot in a predetermined direction, and provides an electrical signal as an output. The photodetector output provides a measurement of the track-to-track spacing of the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.