Storage medium track pitch detector
US4566090A · kind A · utility
10Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1984 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Jul 30, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/14
- 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.