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US 7,922,331 B2Granted
Polarization conversion unit, polarization conversion device, and projector
AssigneeSeiko Epson Corporation
InventorYohei Sakai
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AssigneeSeiko Epson Corporation
InventorYohei Sakai
Estimating the term…
A polarization conversion unit includes a polarization splitting element array including a plurality of polarization splitting films for splitting the incident light beam into two types of linearly-polarized light beams, a plurality of reflecting films for reflecting either one of the linearly-polarized light beams obtained by the polarization splitting films, and a translucent member provided with the polarization splitting films and the reflecting films, a plurality of retardation plates each formed of a quartz crystal member and for converting a polarization axis of either one of the linearly-polarized light beams obtained by the polarization splitting films into a polarization axis of the other of the linearly-polarized light beams, and a spacer member having a predetermined thickness and for bonding end sections of the retardation plates to a light beam exit side of the translucent member.
A polarization conversion device, comprising:
A polarization conversion unit, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Used for beam splitting or combining: comprising arrays of elements, e.g. microprisms
Details: cooling; Preventing overheating
Lamp housings: polarisers in the lamp house
Simultaneous recording or projection: using beam-splitting or beam-combining systems, e.g. dichroic mirrors
About 2 years 9 months of term left · ends 6 Aug 2029 (estimated)
1. Technical Field
The present invention relates to a polarization conversion unit, a polarization conversion device equipped with the polarization conversion unit, and a projector equipped with the polarization conversion device.
2. Related Art
The invention will now be described with reference to the accompanying drawings, wherein like numbers reference like elements.
FIG. 1 is a perspective view for explaining a schematic configuration of a projector according to an embodiment of the invention.
FIG. 2 is a perspective view of an optical unit viewed from the above thereof.
Embodiments of the invention will herein after be explained with reference to the accompanying drawings.
FIG. 1 is a perspective view for explaining a schematic configuration of a projector according to an embodiment of the invention. Hereinafter, the configuration of the projector 1 will be explained with reference to FIG. 1.
The projector 1 is configured including an exterior case 2 having a roughly cuboid shape as a whole, and a cooling unit 3 for reducing the heat accumulated in the projector 1. Further, the projector 1 is configured including an optical unit 4 for optically processing the light beam emitted from a light source to form an optical image based on image information, and a power supply unit 5 for supplying the constituents of the projector 1 with power externally supplied via a power supply cable (not shown).