Obturator disc for an optical transducer
US4716289A · kind A · utility
2Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1985 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34707
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An obturator disc comprising a cylindrical element (11) of transparent plastic material provided with a unitary hub (13) by means of which it can be connected to a rotating member. To a front surface (14) of the cylindrical element there is applied, by a photographic process, a layer of opaque material in an annular zone of which there is formed a plurality of transparent windows (16) of high definition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.