Patent ID: 6035141
Filing Date: 2000-03-07
Classification: G03B

Abstract:
An optical data recording circuit for optically recording data on film in a camera of the type having an oscillator charging circuit, a flash illumination circuit and a battery operatively coupled to the oscillator charging circuit, the oscillator charging circuit including a step-up transformer and an oscillator transistor with an emitter, base and collector; the data recording circuit characterized by:a circuit path including an optical recording device and a switch device coupled between a first terminal of the battery and the base of the oscillator transistor, the battery having a no-load output voltage sufficient to illuminate the optical recording device;the oscillator charging circuit including a resistor connected from the base of the oscillator transistor to a second terminal of the battery and an oscillator start switch connected from the base of the oscillator transistor to said step-up transformer and to said first terminal of the battery;whereby, upon closure of said switch device, if said oscillator charging circuit is not operating, illumination of said optical recording device is effected by said no-load output voltage of the battery through said resistor and, if said oscillation circuit is operating, illumination of said optical recording device is effected by pulses generated in said step-up transformer.