Constant intensity electronic flashlight and lantern method and

Details Constant intensity electronic flashlight and lantern method and Constant intensity electronic flashlight and lantern method and

1995-02-13

1998-10-13

Pascal, Robert J.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

323281, 315307, H05B 3702

Patent

active

058216979

ABSTRACT:
An about constant brightness level of light output is produced from portable battery operated incandescent light sources, such as flashlights, emergency lights and lanterns, throughout the full discharge and terminal voltage decay of the electrochemical charge life of a set of batteries. Instant levels of power flow between the battery and the light source's incandescent bulb are dynamically controlled. When the battery is fresh a reduced portion of the available battery power flows to the light bulb. As at least a portion of the battery wears-down, and charge decreases, the remaining portion of the battery power flow increases thereby keeping the light bulb's filament operating near optimal efficiency and with visually desirable "white-light" brightness. A further advantage is that fewer changes of dry-cell battery sets are needed in order to maintain the light source near peak performance. As the battery finally nears full discharge, an indicator may serve to signal imminent battery failure and the need for replacement. Aside from the constant level of illumination and lower cost flashlight operation, an improved level of environmental responsibility occurs due to fewer drycell battery replacements resulting in reduced battery manufacturing related energy consumption and a reduction in sheer quantity of prematurely replaced potentially contaminating chemical containing drycell batteries being discarded into landfills.

REFERENCES:
patent: 1189794 (1916-07-01), Creveling
patent: 3947753 (1976-03-01), Gushima et al.
patent: 4499525 (1985-02-01), Mallory
patent: 4725759 (1988-02-01), Tachikawa

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