Optical scanner with power efficient lens

Details Optical scanner with power efficient lens Optical scanner with power efficient lens

1991-06-24

1992-11-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359719, H01J 314

Patent

active

051645840

ABSTRACT:
An optical scanner which employs a special lens to maximize the percentage of focused laser light that passes through a collimating aperture. The optical scanner also includes a laser diode and a housing containing the laser diode and having a wall with the aperture therethrough for collimating light from the lens. The lens may be a gradient index (grin) lens, a bi-zonal lens, or an axicon lens. Another scanner is disclosed which employs an axicon lens to focus light reflected from an article having a bar code label to a detector for a range of article distances from the scanner.

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