Light interrupter

US4033693A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Bernd Payrhammer · Munich, DE
• Siegfried Bartel · Gauting, DE
• Geert Besigk

Key dates

• Filing date: Jan 21, 1975
• Grant date: Jul 5, 1977
• Expiry date: Jan 21, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B9/58
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical apparatus in which a beam of light is caused to travel along a predetermined direction is provided with a light interrupter for interrupting the beam. The light interrupter includes a light-interrupting component, such as a shutter blade or color filter, and a driving coil connected to the light-interrupting component. The light-interrupting component and driving coil are mounted for pivotal movement about an axis substantially parallel to the beam direction, with the light-interrupting component moving between a light blocking position and an unblocking position. A control circuit is connected to the driving coil for effecting energization of the coil. A magnet arrangement is so positioned as to establish a magnetic field through which the driving coil moves when the driving coil pivots around the pivot axis, with the magnetic field being oriented substantially perpendicular to the direction of movement of the driving coil.