Reference grid for optical scanner

Details Reference grid for optical scanner Reference grid for optical scanner

1989-03-14

1991-05-14

Arnold, Bruce Y.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250221, 350321, G02B 2700, G01V 904

Patent

active

050150707

ABSTRACT:
A wavelength-selective pad that is transparent when viewed by light of a first wavelength .lambda..sub.1 (e.g., visible light) and is highly reflective when viewed by light of a second wavelength .lambda..sub.2 (e.g., infrared light). The pad has a grid positioned above the highly reflecting layer so that this grid can be sensed by use of light of wavelength .lambda..sub.2 while, simultaneously, images, graphics or text positioned below the pad may be read by use of light of wavelength .lambda..sub.1. A text scanner system that produces and senses light at the two wavelengths is used in combination with the pad to simultaneously read the graphics or text and the grid position of the beam that illuminates the graphics and text.

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