Flash lamp

Details Flash lamp Flash lamp

1985-03-29

1986-08-12

Yeung, James C.

Illumination

Self powered lamp

Cylindrical flashlight casing

362205, 362187, F21L 700

Patent

active

046059946

ABSTRACT:
To efficiently utilize a halogen incandescent lamp in a flashlight, while oviding for essentially uniform illumination of respective spot and flood fields, the halogen incandescent lamp (11) is located within an elliptical reflector portion (12), with the filament of the lamp at one of the focal points of the ellipse. A part spherical reflector portion (13) is joined to the elliptical portion (12). At or close to the second focal point of the ellipse, a diaphragm (14) is located, which diaphragm is imaged by a condenser lens (16). The change between spot and flood illumination is obtained by varying the diaphragm opening, for example by a variable diaphragm size opening, or shifting the diaphragm towards and away from the first focal point.

REFERENCES:
patent: 2338078 (1943-12-01), Wood
patent: 2361480 (1944-10-01), Joffo
patent: 2855499 (1958-10-01), Lewis
patent: 4398238 (1983-08-01), Nelson

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