Dial illuminating system

Details Dial illuminating system Dial illuminating system

1981-06-22

1983-06-07

Lechert, Jr., Stephen J.

Illumination

Revolving

362268, 362331, 362332, F21V 704

Patent

active

043874142

ABSTRACT:
Discloses an improved instrument dial illuminating system including a light transmitting optical element formed with a thickness diminishing in the vicinity of one edge of the optical element to the vicinity of an opposite edge of the element and with a prescribed generally convex surface extending from the thick edge to across the element. Profile is of configuration prescribed to cause light rays refracted within the element from a light source to be reflected from such surface at angles closer to normal with respect to a dial face located adjacent to the light source. Such surface of optical element may be formed with a localized regional surface located intermediate the edges of such element and formed of configuration designated to cause light rays refracted within such optical element from said light source to be reflected from such regional surface at angles closer to normal with respect to such dial face.

REFERENCES:
patent: 3029334 (1962-04-01), Anderson et al.
patent: 3246133 (1966-04-01), Hensleigh
patent: 3752974 (1973-08-01), Baker et al.

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