Free expansion pseudo-zoom for laser projector

Details Free expansion pseudo-zoom for laser projector Free expansion pseudo-zoom for laser projector

1989-12-22

1990-11-27

Arnold, Bruce Y.

350 64, 350286, 350102, 350560, G02B 2608

Patent

active

049731157

ABSTRACT:
The angle of divergence of a laser beam (29) is controlled without significant variation of beam power by using a movable corner cube (18) to vary the length of the optical path of a noncollimated beam (12) so as to present a beam of varying diameter to a telescope lens (26). In a second aspect of the invention, the beam is made insensitive to vibration of the corner cube (18) by covering a portion of its beam-receiving face with a second reflector (32) which causes the beam to make a second pass through the corner cube (18) in a parallel but opposite direction therey cancelling any beam displacement caused by the vibration of the corner cube (18).

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