Wand type optical reader

Details Wand type optical reader Wand type optical reader

1994-09-22

1996-04-16

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

25022713, G06K 710

Patent

active

055085040

ABSTRACT:
A laser wand for reading optically encoded indicia has a wand shaped housing for housing a light emitter which for emits a focussed laser light beam having a fixed focal point beyond which said light beam diverges. The light beam is directed towards a surface on which the indicia is disposed. A spacer is also provided for alternatively defining different separation distances between the light emitter and indicia. At a first separation distance, the light beam forms a sensing spot of a first size on the surface on which the indicia is disposed. This sensing spot is effective for reading indicia having a first physical characteristic. At a second separation distance, the light beam forms a sensing spot of a second size, which is larger than the first size, on the surface on which the indicia is disposed. This later sensing spot is effective for reading indicia having a second physical characteristic different from the first physical characteristic. For example, indicia having the first physical characteristic may be of a higher density than indicia having the second physical characteristic.

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