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Title:
LIGHT SOURCE OPTICAL SYSTEM, LIGHT SOURCE DEVICE, AND IMAGE PROJECTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2020/110464
Kind Code:
A1
Abstract:
A light source optical system used with an excitation light source (21) configured to emit first color light includes a wavelength conversion unit(27) configured to receive the first color light emitted by the excitation light source(21) and emit second color light with a wavelength different from a wavelength of the first color light; and a first optical system(23) having a positive power and a second optical system(26) having a positive power provided in this order in an optical path between the excitation light source(21) and the wavelength conversion unit(27). The first optical system(23) has an optical characteristic such that, when a ray parallel to an optical axis of the first optical system(23) is incident on the first optical system(23), a ray emitted from the first optical system(23) is incident on the second optical system(26) while approaching the optical axis. The second optical system(26) has under-corrected spherical aberration at a paraxial focal position of the second optical system(26).

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Inventors:
TAKANO YOHEI (JP)
NAKAMURA NAOKI (JP)
Application Number:
PCT/JP2019/039440
Publication Date:
June 04, 2020
Filing Date:
October 07, 2019
Export Citation:
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Assignee:
RICOH CO LTD (JP)
TAKANO YOHEI (JP)
NAKAMURA NAOKI (JP)
International Classes:
G03B21/14; F21S2/00; F21V5/04; F21V9/14; F21V9/32; F21V13/02; H04N5/74; F21Y113/10; F21Y115/30
Domestic Patent References:
WO2017126027A12017-07-27
WO2018168429A12018-09-20
Foreign References:
CN108533980A2018-09-14
US20150167932A12015-06-18
JP2017032762A2017-02-09
US20180314141A12018-11-01
US20180239228A12018-08-23
CN108803222A2018-11-13
US20160241822A12016-08-18
JP2019139114A2019-08-22
CN108533980A2018-09-14
Other References:
See also references of EP 3887904A4
Attorney, Agent or Firm:
SUZUKI, Yasushi (JP)
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