Optical systems with compact back focal lengths
First Claim
Patent Images
1. An optical system, comprising:
- an imaging source operable to output light;
a relay element operable to receive the light from the imaging source; and
a projection lens;
wherein the relay element is configured to form an intermediate image having a focal point proximate to an entry surface of the projection lens, the focal point of the intermediate image and the entry surface of the projection lens defining a back focal length therebetween; and
wherein the projection lens is operable to project the intermediate image.
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Abstract
Optical systems, such as 2-D and 3-D projection systems, may be configured to have a compact back focal length to allow for more compact projection lenses, lower throw ratios, improved contrast, or any combination thereof. In an embodiment, an optical system may include a relay element configured to form an intermediate image having a focal point proximate to a projection lens.
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Citations
23 Claims
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1. An optical system, comprising:
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an imaging source operable to output light; a relay element operable to receive the light from the imaging source; and a projection lens; wherein the relay element is configured to form an intermediate image having a focal point proximate to an entry surface of the projection lens, the focal point of the intermediate image and the entry surface of the projection lens defining a back focal length therebetween; and wherein the projection lens is operable to project the intermediate image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical system, comprising:
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an imaging source operable to output light; a relay element operable to receive the light from the imaging source; a polarizing beam splitter assembly; and first and second projection lenses disposed proximate to first and second exit ports of the polarizing beam splitter assembly, respectively; wherein the relay element is configured to form a first intermediate image having a focal point between the first exit port of the polarizing beam splitter assembly and the first projection lens, the focal point of the first intermediate image and an entry surface of the first projection lens defining a first back focal length therebetween; wherein the relay element is configured to form a second intermediate image having a focal point between the second exit port of the polarizing beam splitter assembly and the second projection lens, the focal point of the first intermediate image and an entry surface of the second projection lens defining a second back focal length therebetween; wherein the first and second projection lenses are operable to project the first and second intermediate images, respectively. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An optical system, comprising:
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an imaging source operable to output light; a relay element operable to receive the light from the imaging source; and a projection lens; and a polarization conversion system; wherein the relay element is configured to form an intermediate image having a focal point proximate to an entry surface of the projection lens, the focal point of the intermediate image and entry surface of the projection lens defining a back focal length therebetween; and wherein the projection lens is operable to project light comprising the intermediate image through the polarization conversion system, the polarization conversion system being operable to convert the light comprising the intermediate image to substantially a single polarization state and output converted light along first and second optical paths. - View Dependent Claims (20, 21, 22, 23)
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Specification