Circuit for use with a light pen to reduce jitter

Details Circuit for use with a light pen to reduce jitter Circuit for use with a light pen to reduce jitter

1983-11-18

1988-12-06

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307358, 307360, 307517, 328132, H03K 5153, G01R 19165, G01R 29027

Patent

active

047898364

ABSTRACT:
A high resolution light pen comprises a collimation tube slidably mounted within a housing. The collimation tube includes an axially extending channel having a non-reflective surface. A photodetector is fixably mounted within the housing aligned with the channel. A lens is mounted adjacent to the front end of the channel and has a focal length equal to the spacing between the lens and an aligned pixel of the video screen. By this arrangement, all light rays emanting from an aligned pixel and passing through the lens are refracted axially along the channel and directed to the photodetector thereby maximizing the input thereto. The light pen further includes a discrimination circuit which generates computer interrupt signals for reading an address counter. The discrimination circuit generates an interrupt signal when the signal from the photodetector is valid. The interrupt signal is generated at a time which is substantialy independent of the slope of the signals thereby reducing the effects of jitter.

REFERENCES:
patent: 3289157 (1966-11-01), Brokaw
patent: 4318047 (1982-03-01), Dawson

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