Optical fan levelling system

Details Optical fan levelling system Optical fan levelling system

1975-06-30

1976-10-05

Nelms, David C.

350199, G02B 1700

Patent

active

039841545

ABSTRACT:
This invention provides an optical fan system for projecting a planar fan of light against a surface. A source of collimated light is passed into an edge face bridging between two cylindrical concentric reflective surfaces defining outer surfaces of a translucent or transparent body. The light refracts through the edge face, and then is multiply reflected and refracted between the concentric cylindrical surfaces, with total reflection occurring at the internal surface and partial refraction occurring at the outer surface. Suitable silvering or other reflective material is applied to the surfaces in order to accomplish the desired degree of reflectivity.

REFERENCES:
patent: 2980802 (1961-04-01), Bracey et al.
patent: 3259012 (1966-07-01), Locquin
patent: 3535023 (1970-10-01), Yamanaka et al.

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