Flashlight lamp configuration to produce either a spot or broad

Details Flashlight lamp configuration to produce either a spot or broad Flashlight lamp configuration to produce either a spot or broad

1993-09-08

1995-08-08

Lazarus, Ira S.

Illumination

Self powered lamp

With movable focusing element

362212, 362213, 362350, F21L 300, F21M 318

Patent

active

054404630

ABSTRACT:
A unique two filament flashlight lamp in which one filament is energized to produce a spot beam and the second filament is energized to produce a broad beam. A spot beam is formed when the filament is energized whose axis is perpendicular to the reflector axis and whose center is at the reflector focal point, a broad beam is formed when the second filament is energized whose axis coincides with the reflector axis and has one end located close to the focal point.
In the second embodiment, a lamp having a single filament whose center is located at the reflector focal point and whose axis is perpendicular to the reflector axis will produce a spot beam. The lamp and filament can be reoriented so that the filament axis coincides with the reflector axis and one end of the filament is close to the reflector focal point to produce a broad beam.

REFERENCES:
patent: 1279061 (1918-09-01), Winston
patent: 4598342 (1986-07-01), English et al.
patent: 4644452 (1987-02-01), Kasboske

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