Polarizing multiplexer and methods for intra-oral scanning

Details Polarizing multiplexer and methods for intra-oral scanning Polarizing multiplexer and methods for intra-oral scanning

2007-12-25

2007-12-25

Lavarias, Arnel (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C356S004010, C356S602000, C250S559230, C250S559310, C250S225000

Reexamination Certificate

active

11217239

ABSTRACT:
A polarizing multiplexer includes a first arm with a first beam splitter to receive a first unpolarized light from an object and a first retarder coupled to the first beam splitter to generate a first right-hand circularly polarized (RHCP) beam. A normal incident beam splitter is used to receive the first RHCP beam. The multiplexer also includes a second arm with a second beam splitter to receive a second unpolarized light from an object; and a second retarder coupled to the second beam splitter to generate a left-hand circularly polarized (LHCP) beam, wherein the LHCP beam is reflected off the normal incident beam splitter and converted to a second RHCP beam. Light from both arms pass through the second retarder and are converted to p-polarized light before transmitting through the second beam splitter to an image sensor.

REFERENCES:
patent: 6364660 (2002-04-01), Durbin et al.
patent: 6386867 (2002-05-01), Durbin et al.
patent: 6570659 (2003-05-01), Schmitt
patent: 6975447 (2005-12-01), Kinoshita
patent: 2004/0184038 (2004-09-01), Freischlad et al.

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