Position sensor with half tone optical gradient wedge

Details Position sensor with half tone optical gradient wedge Position sensor with half tone optical gradient wedge

1995-05-23

1996-11-19

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356375, 2502311, G01B 1100

Patent

active

055768300

ABSTRACT:
A position sensor having an opto sensor and an optical density gradient wedge photo interrupter in which the gradient wedge comprises a half tone dot pattern preferably photographically reproduced in a photosensitive medium. In a preferred embodiment, the half tone dots are formed with microdots that are cumulated to increase the density of the half tone dots. In regions of density variations where the half tone dots change shape between round and square (in both solid fill and open fill dots), a random fill pattern is employed to enhance the linearity of the sensor output signal. The beam width of the opto sensor is uncollimated and focused to cover at least three pixel widths of the half tone dot pattern where each pixel is formed of at least four half tone dot areas.

REFERENCES:
patent: 4769667 (1988-09-01), Ishiguro et al.
patent: 4928008 (1990-05-01), Huggins et al.
patent: 4989032 (1991-01-01), Hull et al.
patent: 5325142 (1994-06-01), Depatie et al.

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