Intermediate adapter for camera
US4518239A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1984 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | May 17, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An intermediate adapter for coupling an interchangeable lens having a small flange focal distance, such as an interchangeable lens originally intended for use with a single-lens reflex camera, to a camera body having a large flange focal distance. The adapter includes an aperture device replacing a stop of the interchangeable lens and which is driven by an electric motor. An aperture value data transmitting member transmits aperture value data set by an aperture value setting member provided for the interchangeable lens to the aperture device. An aperture opening degree regulator sets an aperture opening degree to a set aperture value according to the aperture value data transmitted in an aperture driving operation performed by the electric motor. A video changeover device releases the aperture opening degree regulator to allow the aperture device to operate in a range of a fully open state to a fully closed state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.