Camera flash charging apparatus for low cost single use camera

Details Camera flash charging apparatus for low cost single use camera Camera flash charging apparatus for low cost single use camera

1998-09-08

2000-04-25

Wong, Don

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315241S, 396 6, H05B 3702, H05B 4132

Patent

active

060548142

ABSTRACT:
In a flash circuit for a single use camera, a minimum residual charge voltage level is maintained on a flash capacitor to ensure availability of an energy source to operate an auxiliary circuit, such as an optical data recording circuit, even after prolonged periods of non-use of the camera. This minimum charge voltage level is maintained by provision of a DC circuit path from the camera battery via the charger circuit and flash power rectifier diode to the flash capacitor. Automatic restart of the flash charging circuit upon closing of the flash trigger switch is assured by connecting the charging circuit start terminal to the trigger switch by means of a normally reverse biased re-start diode that isolates the start terminal from the flash capacitor voltage on the trigger circuit at all times when the flash trigger switch is open. To avoid inadvertent start up of the flash charger during camera assembly when the battery is installed, an assembly process employs precharging of the flash capacitor to maintain the re-start diode in reverse biased mode during the assembly process.

REFERENCES:
patent: 4942340 (1990-07-01), Ikawa
patent: 5432410 (1995-07-01), Yamada et al.
patent: 5574337 (1996-11-01), Dunsmore
patent: 5634153 (1997-05-01), Constable
patent: 5729774 (1998-03-01), Constable
patent: 5761541 (1998-06-01), Constable et al.
patent: 5780976 (1998-07-01), Matsuo
patent: 5784658 (1998-07-01), Hata et al.

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