Camera automatic exposure control apparatus

US4040111A · kind A · utility

Assignee

• VEB Pentacon Dresden · DE

Inventors

• Fritz Lindner · Stromberg, DE
• Werner Hahn · Dresden, DE

Key dates

• Filing date: Jun 16, 1975
• Grant date: Aug 2, 1977
• Expiry date: Jun 16, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B7/083
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An apparatus for automatic exposure control in a single lens reflex camera including an objective lens having a diaphragm regulating ring and a preselection ring forming part of a preselectable diaphragm means. A photo-electric receiver controls the exposure. A light regulating element having an adjusting device for varying the transparency thereof is provided in the light path from the lens and is positioned in front of the photo-electric receiver. A coupling arrangement is provided in which a receiver diaphragm ring engages the lens diaphragm preselection ring. First and second lugs are provided on the adjusting device of which the first lug can be coupled with the receiver diaphragm ring. A spring loaded lug is provided on the diaphragm regulating ring. A spring loaded unit is also provided having first and second entrainment devices and which can be released by the camera release device, the first entrainment device engaging with the spring loaded lug prior to actuation of the release device and the spring loaded unit moving in the opposite direction to that of the frictional connection of the first lug and the receiver diaphragm ring. The second entrainment device can be coupl…