Blades actuation device for light path

Details Blades actuation device for light path Blades actuation device for light path

1992-08-12

1993-11-16

Gellner, Michael L.

G03B 908

Patent

active

052628124

ABSTRACT:
Actuation device of the invention is used for opening and closing blades for defining light path, i.e. a diaphragm of a camera. The actuation device includes an axle with a permanent magnet, a frame for rotationally receiving the permanent magnet, a hollow magnetic circuit member to retain the frame, and a sensor. Actuation and brake coils are wound around the frame. The actuation coil operates to rotate the permanent magnet, while the brake coil operates to stop rotation of the permanent magnet operated by the actuation coil. The sensor senses the angular location of the permanent magnet. A plurality of terminal pins is arranged on the frame between the actuation and brake coils, so that the ends of both coils can be attached to the desired pins. Also, a printed board attached to the terminal pins is provided with test terminals thereon, so that the device can be tested without causing damage to a terminal section of the printed board.

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