Photocopying – Projection printing and copying cameras – Illumination systems or details
Reexamination Certificate
2005-03-31
2008-07-22
Mathews, Alan A (Department: 2851)
Photocopying
Projection printing and copying cameras
Illumination systems or details
C355S053000, C355S067000, C355S077000, C359S494010, C359S490020
Reexamination Certificate
active
07403267
ABSTRACT:
A system and method utilize a birefringence inducer to induce or change birefringence of an optical element to change an index of refraction within the optical element to produce a polarization-retarded light beam that passes through the optical element. The optical element can include one or more optical plates or adjustable optical compensators. The birefringence inducer can apply external forces on the optical element, such as mechanical, electrical, magnetic, or acoustical forces. A linear polarizer polarizes the output beam from the optical element to produce a linear polarized modified intensity light beam with a desired intensity distribution. A control system for controlling the inducing of birefringence can include an intensity detector and controller, and can provide a control signal to the birefringence inducer.
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ASML Netherlands B.V.
Mathews Alan A
Sterne Kessler Goldstein & Fox P.L.L.C.
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