Light pen input system having two-threshold light sensing

Details Light pen input system having two-threshold light sensing Light pen input system having two-threshold light sensing

1985-05-17

1987-02-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, 340707, G02B 600

Patent

active

046424598

ABSTRACT:
A fiber optic light pen has been adapted for high resolution use with an interactive display of a computer system. The body of the light pen, which is adapted to be hand held, includes a slightly movable tip for engaging a display screen. When so engaged, a screen sensor within the body signals to the computer system that the pen is in contact with the screen. A principal fiber optic element or conduit within the pen body collects light emitted by the screen without the use of any imaging optics and a two-threshold light detector responding to two different amplitude levels of collected light permits separate and high resolution determination of the vertical and horizontal positions of the light pen with respect to the screen.

REFERENCES:
patent: 3777153 (1973-12-01), Anderson et al.
patent: 4109146 (1978-08-01), Hillman

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