Patent ID: 6044227
Filing Date: 2000-03-28
Classification: G03B,H05B

Abstract:
A lens-fitted photo film unit, in which a film housing is pre-loaded with unexposed photo film, said film housing including a photograph-taking device and an electronic flash device, said photograph-taking device including a taking lens and a shutter mechanism, said flash device including a flash-emitting section driven in response to actuation of said shutter mechanism for emitting flash light toward a photographic field within a predetermined range, a main capacitor for storing charge to be discharged in said flash-emitting section, and a flash circuit board having a flash circuit for controlling charging of said main capacitor and flash emission of said flash-emitting section, wherein said flash circuit board further includes an oscillator, connected to a power source, for converting a current thereof into a current of high voltage to be supplied to said main capacitor, said oscillator including:a transistor for oscillation;a primary winding connected between said power source and a collector of said transistor;a secondary winding, combined in a mutual induction with said primary winding, and connected between said main capacitor and a base of said transistor;a tertiary winding, combined in mutual induction with said secondary winding, and having a first end connected to said power source and a second end connected to said base of said transistor; anda light-emitting diode connected in parallel with said tertiary winding, said light-emitting diode having a cathode connected to the first end of said tertiary winding, driven to emit light in response to charging of said main capacitor at a predetermined level.