Rotational information output device
US4733070A · kind A · utility
3Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1985 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Dec 9, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fixed slit plate and a rotary slit plate which is secured to a rotating shaft are provided between two photoconductive elements and a light emitting element, and the two photoconductive elements provide two outputs which have the phase difference .pi. therebetween. These two outputs thus provided are added to extract the dc component, thereafter exerting feedback control over the light emitting element such that this dc component is maintained at a constant level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.