Laser distance measuring apparatus and control method thereof

Details Laser distance measuring apparatus and control method thereof Laser distance measuring apparatus and control method thereof

2011-06-28

2011-06-28

Alsomiri, Isam (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S005150

Reexamination Certificate

active

07969559

ABSTRACT:
A laser distance measuring apparatus and control method thereof includes an emitter, a first and second liquid crystal display module, a receiver, a condensing lens, and a control unit. The emitter emits measuring light. The control unit sets the first liquid crystal display module to a second state and the second liquid crystal display module to a first state to receive the reflected light. When the reflected light is larger than a predetermined value, the control unit adjusts a transmittance of the first liquid crystal display module until the reflected light is lower than the predetermined value, and calculates a distance value based on phase difference between the reference light and the reflected light.

REFERENCES:
patent: 5815251 (1998-09-01), Ehbets et al.
patent: 7471377 (2008-12-01), Liu et al.
patent: 7738083 (2010-06-01), Luo et al.
patent: 2005/0151957 (2005-07-01), Stierle et al.
patent: 2007/0236679 (2007-10-01), Luo et al.
patent: 2009/0141001 (2009-06-01), Kuroda et al.

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