US 11,841,611 B2
Projector
Tatsuya Oku, Matsumoto (JP); and Norikazu Kadotani, Azumino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Sep. 28, 2022, as Appl. No. 17/954,672.
Claims priority of application No. 2021-158907 (JP), filed on Sep. 29, 2021.
Prior Publication US 2023/0102817 A1, Mar. 30, 2023
Int. Cl. G03B 21/16 (2006.01); G03B 21/00 (2006.01); G03B 21/20 (2006.01)
CPC G03B 21/16 (2013.01) [G03B 21/006 (2013.01); G03B 21/208 (2013.01); G03B 21/2073 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A projector comprising:
a light source device;
a homogenization optical element configured to homogenize light emitted from the light source device;
a polarization conversion element configured to align polarization of the light emitted from the homogenization optical element;
at least one liquid crystal panel which the light emitted from the polarization conversion element enters;
at least one incident side polarization plate disposed at a light incident side of the liquid crystal panel;
at least one exit side polarization plate disposed at a light exit side of the liquid crystal panel;
a projection optical system configured to project the light modulated by the liquid crystal panel;
a first housing configured to house at least one of the liquid crystal panel, the incident side polarization plate and the exit side polarization plate in a sealed state;
a second housing configured to house at least one of at least a part of the homogenization optical element and the polarization conversion element in a sealed state;
a first heat-transfer section configured to receive heat from at least one of the liquid crystal panel, the incident side polarization plate, and the exit side polarization plate housed in the first housing, and configured to transfer the heat to an outside of the first housing;
a second heat-transfer section configured to receive heat from at least one of at least a part of the homogenization optical element and the polarization conversion element housed in the second housing, and configured to transfer the heat to an outside of the second housing;
a first fan configured to feed an air current toward the first heat-transfer section and the second heat-transfer section; and
a first duct which extends from the first fan, and in which a part of the first heat-transfer section and a part of the second heat-transfer section are disposed.