One time use camera using magnetic micro-shutter as an exposure frame counter

摘要

A novel exposure frame counter is disclosed that gives the appearance of more expensive LCD type displays while not requiring the support electronics and has the ability to erase itself after being used. A disc (10) of low permeable magnetic material has exposure frame numbers recorded into the material in a selected manner so as to create a desired magnetic field. A magnetic micro-shutter (26) is used to create the exposure frame numbers by placing individual micro-shutters over the disc which react to the magnetic field of the disc to form numerals that indicate the exposure frame the camera is on. When the camera is advanced, the section of the disc (10) that was indicating the exposure frame advances to the next frame and the previous frame passes across a field created by a strong permanent magnet and is erased by the permanent magnet. The magnetic micro-shutters of the exposure frame counter are formed essentially as a seven-segment display to form the numerals of the exposure frame counter. <IMAGE>