Patent · US Expired

Camera with motor-driven diaphragm device

US4681417A · kind A · utility

4Cited by

8References

6Claims

0Family size

Assignee

Canon Kabushiki Kaisha · JP

Inventors

Masahisa Fujino · Tokyo, JP
Hidehiko Fukahori · Kawasaki, JP
Toshihiko Satoh · Kawasaki, JP

Key dates

Filing date	Sep 16, 1986
Grant date	Jul 21, 1987
Priority date	—
Expiry date	Sep 16, 2006

Classification

Technology area (CPC G)Physics
CPC primaryG03B7/10
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A camera having a motor-driven diaphragm device comprises a diaphragm driving motor disposed within the camera; a diaphragm driving member which is driven by the motor to open or close the diaphragm aperture of a photo-taking lens; and a change-over switch to shift the rotating direction of the motor depending on the opening or closing of a switch which operates in association with a shutter release button. The diaphragm aperture is stopped down by the driving force of the motor when the release button is depressed and is opened to the fully open position thereof by reverse rotation of the motor when the release button is no longer depressed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.