Patent · US Expired

Photographic exposure control apparatus having remote filter holder mechanism

US5034761A · kind A · utility

5Cited by
8References
7Claims
0Family size

Inventor

Key dates

Filing dateOct 19, 1990
Grant dateJul 23, 1991
Priority date—
Expiry dateOct 19, 2010

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03B15/03
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A photographic exposure control apparatus includes a directable light source, and an auxiliary shutter which is located between a camera lens and a subject. The auxiliary shutter includes a housing structure which has a window therein. The window is selectively opened and closed by a blade which is movably mounted on the housing structure, which is motor driven, and which allows the housing structure to block entry of light into a camera lens when the window is closed, and to allow light into the lens when the window is open. A filter holder is mounted on the housing and is selectively remotely insertable between the lens and a subject.

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