Light beam target and apparatus using the same

Details Light beam target and apparatus using the same Light beam target and apparatus using the same

1974-10-29

1976-05-11

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214R, 273 1E, 340366D, 340371, 340381, 250203R, H01J 3912

Patent

active

039566277

ABSTRACT:
A light beam target for light beam shooting and apparatus employing it are disclosed. The light beam target has a light transparent target plate, stripe-like first and second X- and Y-axis photoelectric conversion elements and a compensating photoelectric conversion element disposed on the back of the target plate. When a light beam is projected onto the target plate, the first and second X- and Y-axis photoelectric conversion elements provide first and second X- and Y-axis electric signals corresponding to the position of the center of the light beam on the target plate. The apparatus using such light beam target has a circuit for producing X- and Y-axis light beam center indicating signals indicative of the position of the center of the light beam on the target plate based on the first and second X- and Y-axis electric signals and a device for displaying on an indicator plate the position of the center of the light beam on the target plate.

REFERENCES:
patent: 3435232 (1969-03-01), Sorensen
patent: 3651252 (1972-03-01), Land et al.
patent: 3819273 (1974-06-01), Unema et al.

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