Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Patent
1993-01-21
1995-09-19
Sugarman, Scott J.
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
359 49, 353 20, 353 33, 362 19, G02B 2728
Patent
active
054521289
ABSTRACT:
A polarization illumination apparatus is constituted by only a light source, light condensing means having a reflection mirror arranged behind the light source, polarization beam splitting means for splitting light emerging from the light condensing means into first and second polarized light components having different directions of polarization, and return means for returning the first polarized light component to the light condensing means. The direction of polarization of the first polarized light component is changed in such a manner that the first polarized light component from the return means is obliquely incident on and reflected by a mirror surface of the reflection mirror. Therefore, a polarization illumination apparatus which can modulate the vibration direction of polarized light without using an optical phase plate, and has high light utilization efficiency, and a projector using the apparatus can be realized.
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Canon Kabushiki Kaisha
Jr. John Juba
Sugarman Scott J.
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