Patent ID: 6411779
Filing Date: 2002-06-25
Classification: G03B

Abstract:
A lens-fitted photo film unit, including a photo film housing, a photo film roll chamber formed in said photo film housing and pre-loaded with photo film in a roll form, and a cassette holder chamber, formed in said photo film housing, for incorporating a photo film cassette, to wind said photo film therein after being exposed, said photo film housing incorporating a flash-emission main capacitor, a flash discharge tube and a flash circuit, said main capacitor storing charge by a charging operation, said flash discharge tube emitting flash light by a discharging operation of said charge, and said flash circuit controlling said main capacitor and said flash discharge tube for effecting said charging operation and said discharging operation, said lens-fitted photo film unit comprising:a charged voltage detector circuit for generating a full-charged signal when said main capacitor is charged to a predetermined voltage; a memory IC incorporated in said photo film housing or said photo film cassette; a write control IC for writing information to send memory IC, said a write control IC selectively having first, second and third states, said write control IC setting said first state in response to said full-charged signal, for stopping said charging operation, said write control IC setting said second state upon taking of an exposure, to write said information to said memory IC while keeping said charging operation stopped, and said write control IC setting said third state after having said second state, for allowing said charging operation; wherein the write control IC is constructed to generate an output signal that can be selectively set by the write control IC to any of three electrical conditions, the three electrical conditions corresponding to the first through third states, respectively.