Optical: systems and elements – Polarization without modulation – Depolarization
Reexamination Certificate
2005-12-13
2005-12-13
Shafer, Ricky D. (Department: 2872)
Optical: systems and elements
Polarization without modulation
Depolarization
C359S485050
Reexamination Certificate
active
06975456
ABSTRACT:
Illumination apparatus includes a light source which directs a polarized source beam in a downstream direction along an optical axis and desirably focuses the beam. A polarization-altering element downstream from the source such as a birefringent plate alters the polarization in a portion or portions of the source beam, so that the altered beam includes portions having different polarization directions. The altered beam passes downstream through a polarization-selective filter. The output beam from the polarization-selective filter can include either portion depending on the orientation of the filter. The arrangement can be used to provide a spot of a given size and shape at the focal location in a scanner such as a bar code scanner. The size and depth of field of the spot can be varied dynamically during operation.
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Amundsen Thomas
Giordano Patrick A.
Good Timothy A.
Gart Matthew S.
Metrologic Instruments Inc.
Shafer Ricky D.
Smith Nancy A.
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