Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1991-12-26
1993-01-05
Hellner, Mark
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
356155, 33288, 3320318, G01B 11275
Patent
active
051775581
ABSTRACT:
A wheel alignment apparatus (10) for measuring the toe angles of the wheels (42) of a vehicle such that the wheels (42) may be properly aligned, including vehicles whose rear axle (20) and front axle (22) are of unequal lengths. The wheel alignment apparatus (10) of the present invention includes at least one light beam source (14) for emitting a beam of light (24) toward a photosensor (12). The light beam (24) produces currents at each end of the photosensor (12), the currents then being measured and processed by a signal processor (16) to determine the impinging angle of the light beam (24). Each of the light beam sources (14) and the photosensors (12) are attached to the respective wheels (42) with connecting apparatuses, or heads (18). The photosensor (12) is a lateral photocell for receiving at least a portion of the emitted light beam (24) on a continuous active area (30). The signal processor (16) includes an Analog-to-Digital (A-D) converter (94) for data analysis and storage. Heads (18) are provided for carrying the light beam sources (14) and photosensors (12) and are placed about the vehicle proximate each wheel (42).
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Hunter, Lee, "3-Lines", 1978.
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