Optics: motion pictures – Projection light sources
Patent
1993-09-27
1995-01-31
Gellner, Michael L.
Optics: motion pictures
Projection light sources
352244, 353122, 356153, 356123, 372102, G03B 2100
Patent
active
053862570
ABSTRACT:
Apparatus for aligning the optical systems of a lamphouse and a movie projector in the form of a laser alignment tool having a single beam laser with a diffraction grating to split the beam into multiple beams and the laser diode module is housed in a cylindrical casing. The diffraction grating splits the single laser into a specific number of beams of equal intensity, consisting of a center beam and each of the beams to either side of it at equal angles. The laser alignment tool has a geared motor with an adjustable speed which rotates the diffraction grating so that each angled beam sweeps a concentric circle with respect to the other beams. The diffraction grating is interchangeable so that the laser alignment tool can be used for lamphouse systems with varying focal lengths or for other applications such as reflector inspection. The motor may be turned on or off while the laser is kept on. The speed of rotation of the beams is controlled by varying the voltage to the motor.
REFERENCES:
patent: 1921215 (1933-08-01), Carpenter
patent: 3043184 (1962-07-01), Fitzgerald et al.
patent: 4291990 (1981-09-01), Takasu
patent: 4916485 (1990-04-01), Loth et al.
patent: 5257051 (1993-10-01), Bushroe
Gellner Michael L.
Lee Eddie C.
Logan II Charles C.
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