Parallax free light pen

Details Parallax free light pen Parallax free light pen

1976-09-27

1977-10-11

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 10, 350116, G02B 514

Patent

active

040537650

ABSTRACT:
A light pen sighting device for aligning the receptor of a light pen with an interactive display includes a support member in the form of a transparent plastic body having opposed parallel surfaces with a reticle in the form of points formed in the respective surfaces and a reflector disposed directly between and aligned with the reticle for reflecting light travelling along the axis of the reticle directly into the receptor of a light pen to which the device is mounted, thereby providing a parallex free light pen. An alternate embodiment utilizes fiber-optics for receiving and transmitting light to the receptor.

REFERENCES:
patent: 3475612 (1969-10-01), Stupar et al.
patent: 3652147 (1972-03-01), Mohr
patent: 3937558 (1976-02-01), Mukai et al.

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