Quadrature encoding device with slope-triggered digitizing circu

Details Quadrature encoding device with slope-triggered digitizing circu Quadrature encoding device with slope-triggered digitizing circu

1998-07-27

2000-08-01

Tokar, Michael

Coded data generation or conversion

Digital pattern reading type converter

Real and complementary patterns

341144, H03M 122

Patent

active

060973196

ABSTRACT:
A quadrature encoding device with slope-triggered digitizing circuit is provided for use in a mechanical mouse. The quadrature encoding device is capable of producing two square-wave signals indicative of the current mouse movement for position control of the mouse cursor on the computer screen. The slope-triggered digitizing circuit includes a delay circuit and an analog comparator, which is capable of generating a first voltage output when the slope of the opto-electrical signal from the photo detector is positive, and a second voltage output when the slope is negative. It is characteristic feature of the quadrature encoding device that the output characteristic of the slope-triggered digitizing circuit would not be affected by any deviations in the output characteristic of the associated photo detectors, and also would not be affected by the ambient light. Moreover, the quadrature encoding device can operate without having to make adjustments on threshold voltage, which makes the quadrature encoding device more convenient to use, simpler in circuit complexity, and lower in manufacturing cost as compared to the prior art.

REFERENCES:
patent: 3821896 (1974-07-01), Grob
patent: 3845362 (1974-10-01), Roe
patent: 4653905 (1987-03-01), Farrar et al.

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