Optical encoder with fiber optics
US4162399A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1977 |
| Grant date | Jul 24, 1979 |
| Priority date | — |
| Expiry date | Sep 16, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/347
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Light is modulated by an optical code member having first and second parallel tracks, each with alternate segments of different optical characteristics, such as optical reflectivity. The different segments are staggered between the parallel tracks. The modulated light is transmitted along first and second fiber optic elements from the first and second tracks to respective first and second photoelectric sensors having a common substrate to produce push-pull electrical outputs from said sensors. The light may be supplied to the first and second tracks by respective third and fourth fiber optic elements, which may extend from a common light source. The third and fourth fiber optic elements may have light supplying ends which are closely adjacent the light receiving ends of the first and second fiber optic elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.