Digital coding of angles
US4064504A · kind A · utility
18Cited by
9References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1975 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Mar 26, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/305
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a digital angle coder, a revolving disc bears a first series of marks ularly spaced around its axis, capable of being read by two diametrically-opposed fixed heads, and a second series of marks equal in number to the first, regularly spaced around the axis and capable of being read by two diametrically opposed movable heads. Each of the heads includes, for example, a grid reproducing a portion of the series of marks, a photo-emission element and a photo-receiving element. A first auxiliary mark may be read by a fixed auxiliary head and a second auxiliary mark may be read by a movable auxiliary head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.