Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1982-09-13
1984-08-07
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315232, 315322, 351206, 354 62, H05B 4132, A61B 314
Patent
active
044646089
ABSTRACT:
A circuit for operating and controlling optical apparatus for viewing an object and making a photographic record thereof and having an illuminating light source and a photoflash light source, the circuit including a pulse width modulator for operating the illuminating light source, a flyback converter circuit and capacitor charging and discharging circuit for operating the photoflash light source, a clock pulse source connected to the pulse width modulator and the flyback converter for operating the same, and a delay circuit for allowing the optics to settle before operation of the photoflash. An energy level control circuit monitors the capacitor voltage and stops application of clock pulses to the flyback converter when the capacitor voltage reaches a desired value. A first visual indicator signals when the desired capacitor voltage is reached, a second visual indicator signals a certain condition in the apparatus, and a circuit gives priority to operation of the second indicator. Another photoflash light source and associated capacitor charging and discharging circuit is included, along with a switch for selectively controlling the connection of the flyback converter to either of the capacitor circuits for allowing operation of the photoflash light sources only one at a time. A protective diode network prevents a current surge from a charged capacitor circuit when one of the photoflash light sources and associated circuits is connected to the apparatus. An additional discharge path is provided for the capacitor circuit of the light source already connected to the apparatus when the other light source and circuit is subsequently connected to the apparatus. Each photoflash light source and associated capacitor charging and discharging circuit is provided with a branch for discharging stored energy when that light source and associated circuit is disconnected from the apparatus.
REFERENCES:
patent: 4238142 (1980-12-01), Richards et al.
patent: 4291961 (1981-09-01), Takayama
patent: 4354749 (1982-10-01), Hosoda
LaRoche Eugene R.
Spencer Alan H.
Warner Lambert Technologies, Inc.
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