Automatic control device for controlling the iris diaphragm in an optical system
US4378146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1981 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Feb 26, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic control device for controlling the iris diaphragm in an optical system having lens groups therein, comprising an outer casing adapted to be detachably secured to the optical system surrounding the optical system and an iris diaphragm drive mechanism mounted in the outer casing. The iris drive mechanism includes a drive source in the form of an annular rotary electric motor provided by an annular rotor and an annular stator opposing the annular rotor, said rotor and stator being disposed in the optical axis of the optical system. The electric motor responses to a signal from photometer means of the optical system and rotates the rotor to thereby operate the iris diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.