Single channel encoder with specific scale support structure
US4786803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jun 1, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The single channel encoder comprises a transparent scale in which the scale divisions are defined by transverse opaque lines having a width greater than the width between the opaque lines. An emitter holder and a detector holder snap together, clamping an aperture plate there between. The aperture plate has a slit therein which is disposed in the optical path between the emitter and the detector. Projections functioning as scale supports on the opposite sides of the emitter holder and the detector holder are disposed in longitudinally spaced positions and define a gap therebetween for engaging the outside edges of the encoder scale outside of the opaque transverse lines to precisely position the scale in the optical path for maintaining a constant gap between the encoder scale and the aperture plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.