Light emitting device

Details Light emitting device Light emitting device

1985-10-03

1987-10-06

Punter, William H.

Pipe joints or couplings

With casing, lining or protector

Insulated

285282, 403164, G02B 2602, F16D 300

Patent

active

046978909

ABSTRACT:
A device, such as a flashlight, spotlight, or reading light, for emitting an incident beam of light wherein the intensity and color of an incident beam of light emitted from the device can be manually modulated or adjusted. The device utilizes a variable density filter system which is manually adjustable and which incorporates a pair of optical linear polarizing filters or lenses which are mounted so that the emitted beam of light must pass through the polarizing filters. The filter system is adapted to produce at one extreme a high transmittance value when the axes of the polarizing filters are parallel. At the opposite extreme a very high extinction density is achieved when the axes of the polarizing filters are oriented so as to be essentially normal or perpendicular with each other. Varying optical densities are produced at settings between these two extremes.

REFERENCES:
patent: 744545 (1903-11-01), Hervey
patent: 1750986 (1930-03-01), Barry
patent: 2111187 (1938-03-01), Keeler
patent: 2684259 (1954-07-01), Schwartz
patent: 3423149 (1969-01-01), Braunhut
patent: 4202601 (1980-05-01), Burbo et al.

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