Optical scanners with scan motion damping and orientation of ast

Details Optical scanners with scan motion damping and orientation of ast Optical scanners with scan motion damping and orientation of ast

1992-09-10

1994-12-13

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235462, 359198, 359202, 348205, G06K 710

Patent

active

053731484

ABSTRACT:
In an optical scanner, a component for producing a beam scanning motion is mounted on a first flexible strip or planar spring. One or more additional flexible strips, adjacent the first flexible strip, provide additional support to prevent droop by the first flexible strip under the weight of the scanning component. The additional flexible strips also frictionally damp the low frequency motion of the first flexible strip to prevent interference with scanning due to vibration induced from movement of the scanner by an operator. In two-dimensional scanners, where the component moves in two orthogonal directions at two different speeds, the additional strip type frictional damping is applied to the planar spring which provides the necessary flexible support for motion in the slow speed scanning direction. Also, two-dimensional scanners conforming to the present invention use a gain-guided visible laser diode oriented in a particular manner so that the astigmatism of the laser beam extends the working range by compensating for decreasing fast direction scan line density at points farther away from the scanner.

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