Title:
LIGHT SOURCE DEVICE AND PROJECTION-TYPE VIDEO DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/058587
Kind Code:
A1
Abstract:
According to the present invention, a light source device comprises a light source element that outputs first light that is light of a first wavelength band, a first selective reflection element that is arranged at a position that is struck by the first light, transmits a first linearly polarized light component that is defined by the incidence direction and reflection direction of incident light, and reflects a second linearly polarized light component that has a plane of vibration that is orthogonal to the plane of vibration of the first linearly polarized light component, a second selective reflection element that is arranged at a position that receives light that has been transmitted or reflected by the first selective reflection element and transmits or reflects incident light in accordance with the wavelength band of the incident light, and a first polarization direction conversion element that is arranged between the first selective reflection element and the second selective reflection element and converts first linearly polarized light that has been transmitted or reflected by the first selective reflection element to circularly polarized light. The first polarization direction conversion element also converts circularly polarized light that is reflected by the second selective reflection element and reenters the first polarization direction conversion element to second linearly polarized light.
Inventors:
IKEDA TAKASHI
TANAKA YOSHIKI
MAEDA MAKOTO
NISHIKAWA YUSAKU
OKUNO MANABU
TANAKA YOSHIKI
MAEDA MAKOTO
NISHIKAWA YUSAKU
OKUNO MANABU
Application Number:
PCT/JP2022/036886
Publication Date:
April 13, 2023
Filing Date:
October 03, 2022
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G03B21/00; F21S2/00; F21V7/28; F21V9/14; F21V9/35; G03B21/14
Foreign References:
| JP2017122810A | 2017-07-13 | |||
| JP2019028361A | 2019-02-21 | |||
| JP2016142983A | 2016-08-08 | |||
| CN211180515U | 2020-08-04 | |||
| US5473465A | 1995-12-05 | |||
| JPH112723A | 1999-01-06 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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