Reference light beam projector

Details Reference light beam projector Reference light beam projector

1978-12-28

1981-10-06

Punter, William H.

Optics: measuring and testing

Angle measuring or angular axial alignment

350 62, 356153, G01B 1126, G02B 2717

Patent

active

042932181

ABSTRACT:
A reference light beam projector of the type which produces a modulated plane of light for use as a reference in many different applications such as for aligning railroad tracks. This modulated reference plane is formed by projecting a collimated light beam along a predetermined path and providing means for variably refracting the beam so to effectively variably bend the beam back and forth along a plane. Specifically, the means for variably refracting the beam is a rotating optical element comprising a window through which the beam is transmitted and variably refracted as the optical element is rotated.

REFERENCES:
patent: 3771876 (1973-11-01), Ljungdahl et al.
patent: 3776995 (1973-12-01), Little, Jr.
patent: 3856409 (1974-12-01), Cindrich et al.
patent: 3902810 (1975-09-01), Hamar
patent: 3966328 (1976-06-01), Wiklund
patent: 4007992 (1977-02-01), Petrohilos et al.

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