Optical encoder with a shutter clutched for directional movement

Details Optical encoder with a shutter clutched for directional movement Optical encoder with a shutter clutched for directional movement

1982-12-16

1985-08-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33 1M, 250237R, G01D 538

Patent

active

045338302

ABSTRACT:
The following specification discloses a Directional Optical Encoder including a track ball. The track ball is supported within a case and moves against two respective shafts for providing positive and negative X and Y movement. The shafts turn circular optical disc encoders wherein a beam of light passes through a slotted disc to be received against a sensing device, such as an optical sensor. The disc is a round disc having slots in order to provide rotationally pulsed outputs to a light sensor on the opposite side of the disc from a light source, such as a light emitting diode (LED). On each shaft, a pendulous shutter is journalled with a fractional or clutched helical spring engagement for providing movement of the shutter in either the plus direction or the minus direction respectively for the X and Y shafts. The shutters provide for shuttering of the light source to one of two light sensors to indicate minus or plus movement, depending upon which particular sensor is being covered. The attendant output from either the minus or plus sensor for each respective X and Y shaft allows for a pulsed output directly to a circuit without further conditioning, modification, or decoding to determine direction.

REFERENCES:
patent: 3304434 (1967-02-01), Koster
patent: 3613090 (1971-10-01), Mason
patent: 3789218 (1974-01-01), Blount

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