Photographic camera light controlling apparatus

US4334748A · kind A · utility

Inventors

• Horst Stacklies · Greding, DE
• Achim Schindler · Oberkochen, DE

Key dates

• Filing date: Dec 3, 1979
• Grant date: Jun 15, 1982
• Expiry date: Dec 3, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B9/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Photographic camera light controlling apparatus for driving a light admitting system, comprising PA1 four stator electromagnetic poles defining therebetween an intervening field space containing a linear path, including first and second transversely opposed poles at one path end and third and fourth transversely opposed poles at the other path end, with said first and third poles on one path side and second and fourth poles on the opposite path side, PA1 a field coil mechanism energizable alternately in opposite current flow directions and coordinated to energize said first and fourth poles with one polarity and said second and third poles with the opposite polarity, and alternately vice versa, thereby providing in such field space oppositely polarized electromagnetic fields, PA1 a permanent magnet for driving such system, having its permanent poles arranged transversely of the path and forming a surface magnetized permanent magnet with one permanent pole facing said first and third poles and the opposite permanent pole facing said second and fourth poles, for permitting the magnet to reciprocate along the path from a fully immersed electromagnetic field position between said first…