Focusing-type calculating means

Details Focusing-type calculating means Focusing-type calculating means

G - Physics

06

E

G06E 1/00 (2006.01) G01D 5/26 (2006.01) G01D 5/347 (2006.01) G01D 5/38 (2006.01) H03M 1/30 (2006.01)

Patent

CA 2236772

A focusing-type calculating device comprising a light source, a grating wheel, and a photo-detector. The input plane of the grating wheel has a ring-shaped lens to focus the light emitted from the light source. The output plane of the grating wheel has a plurality of tooth-shaped lenses perpendicular to the ring-shaped lens, which can focus the working beams after the working beams pass through the output plane, thus minimizing interference. The device can be used for detecting the position, speed and acceleration of a moving or rotating object such as a computer mouse.

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