Flashlight with soft turn on control

Details Flashlight with soft turn on control Flashlight with soft turn on control

1987-04-14

1989-08-08

Moore, David K.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315311, H05B 3702

Patent

active

048556475

ABSTRACT:
A flashlight is provided with a special circuit for limiting the surge current through the flashlight bulb. The circuit includes a secondary incandescent filament used to energize a transistor gradually upon the activation of flashlight. The transistor in turn gradually energizes the main bulb.

REFERENCES:
patent: 2247198 (1941-06-01), Krefft et al.
patent: 3201580 (1965-08-01), Moore
patent: 3612945 (1971-10-01), Stevens
patent: 3800136 (1974-03-01), Edelson
patent: 3975658 (1976-08-01), Emtage et al.
patent: 4499525 (1985-02-01), Mallory
patent: 4570108 (1986-02-01), Stroede et al.
patent: 4626745 (1986-12-01), Davenport

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