Light-emitting element drive circuit

Details Light-emitting element drive circuit Light-emitting element drive circuit

1994-03-30

1995-08-15

Pascal, Robert J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315200A, 315240, 354415, 354418, 3541451, H05B 3700

Patent

active

054422604

ABSTRACT:
A light-emitting element drive circuit for a camera comprises a diode and a light-emitting element connected in series with each other between a power source and ground, a first switching element switchable between on and off states for driving the light-emitting element, second and third switching elements connected in series with each other between the power source and ground, and a capacitor connected between a junction point of the diode and light-emitting element and a junction point of the second and third switching elements. The second and third switching elements also constitute switching elements of a drive circuit for driving a DC motor, whereby the light-emitting element can be driven with a voltage which is approximately twice as high as the power source voltage. Since the light-emitting element is driven by a capacitor charge/discharge operation instead of using a boosted power source, the consumption of current is reduced and the light-emitting period is shortened.

REFERENCES:
patent: 4803507 (1989-02-01), Akashi et al.
patent: 4942340 (1990-07-01), Ikawa
patent: 5032864 (1991-07-01), Ishimura et al.
patent: 5327070 (1994-07-01), Seki et al.

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