Polarizing beam splitter and projection systems using the polarizing beam splitter
First Claim
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1. A polarizing beamsplitter, comprising:
- a first multilayer reflective polarizing film comprising a plurality of layers, wherein the plurality of layers has a first distribution of optical thicknesses;
a second multilayer reflective polarizing film proximate the first multilayer reflective polarizing film, wherein the second multilayer reflective polarizing film comprises a plurality of layers, wherein the plurality of layers has a second distribution of optical thicknesses, wherein the second distribution is different than the first distribution, and further wherein a major surface of the second multilayer reflective polarizing film faces a major surface of the first multilayer reflective polarizing film; and
covers disposed on either side of the first and second multilayer reflective polarizing films.
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Abstract
A polarizing beam splitter (PBS) includes a first multilayer reflective polarizing film and a second multilayer reflective polarizing film disposed between two covers. The two multilayer reflective polarizing films can be the same or different. The PBS can be used in a variety of applications.
259 Citations
23 Claims
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1. A polarizing beamsplitter, comprising:
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a first multilayer reflective polarizing film comprising a plurality of layers, wherein the plurality of layers has a first distribution of optical thicknesses;
a second multilayer reflective polarizing film proximate the first multilayer reflective polarizing film, wherein the second multilayer reflective polarizing film comprises a plurality of layers, wherein the plurality of layers has a second distribution of optical thicknesses, wherein the second distribution is different than the first distribution, and further wherein a major surface of the second multilayer reflective polarizing film faces a major surface of the first multilayer reflective polarizing film; and
covers disposed on either side of the first and second multilayer reflective polarizing films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A polarizing beamsplitter, comprising:
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a first multilayer reflective polarizing film;
a second multilayer reflective polarizing film proximate the first multilayer reflective polarizing film, wherein a major surface of the second multilayer reflective polarizing film faces a major surface of the first multilayer reflective polarizing film; and
covers disposed on either side of the first and second multilayer reflective polarizing films. - View Dependent Claims (12, 13, 14, 15)
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16. A projection system, comprising:
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a light source to generate light;
conditioning optics to condition the light from the light source;
an imaging core to impose an image on conditioned light from the conditioning optics to form image light, wherein the image core comprises at least one polarizing beamsplitter and at least one imager, wherein the polarizing beamsplitter comprises;
a first multilayer reflective polarizing film;
a second multilayer reflective polarizing film proximate the first multilayer reflective polarizing film, wherein a major surface of the second multilayer reflective polarizing film faces a major surface of the first multilayer reflective polarizing film; and
covers disposed on either side of the first and second multilayer reflective polarizing films; and
a projection lens system to project the image light from the imaging core. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method of making a polarizing beamsplitter, the method comprising:
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forming a first multilayer reflective polarizing film;
forming a second multilayer reflective polarizing film;
placing a major surface of the second multilayer reflective polarizing film opposite a major surface of the first multilayer reflective polarizing film; and
placing the first and second multilayer reflective polarizing films between two covers.
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Specification