Photographic camera with single selector structure performing exposure-parameter adjustment and also switching of control and monitoring circuits

US4269492A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Dieter Engelsmann · Unterhaching, DE
• Rolf Schroder · Wuppertal, DE

Key dates

• Filing date: Mar 14, 1979
• Grant date: May 26, 1981
• Expiry date: Mar 14, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B17/00
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A selector slide is manually displaced by the user from an inoperative setting to a series of operative settings for adjusting exposure-aperture size. When the selector slide leaves inoperative setting, it closes a main power-connect switch connecting the camera's various circuits to the camera battery. The selector slide is provided with a pushbutton which the user depresses to initiate various control or test functions, some of which are performed only in certain settings of the selector slide, others of which are performed within all settings to which the user might move the slide in the course of adjusting aperture size, or another exposure parameter. Examples of such functions are activating a user-oriented scene-light-sufficiency indicator circuit and a circuit which indicates the state of the camera battery. Certain settings of the selector slide are reserved for flash-exposure use, and in these settings the user employs the slide to select subject-distance, and thereby indirectly the exposure-aperture size; in the flash-exposure settings, the slide also closes an enablement switch which readies a flash unit for operation. In this way, essentially only the slide and the push…