Title:
PROJECTION SYSTEM AND OBSERVATION ASSISTANCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/210779
Kind Code:
A1
Abstract:
This projection system includes an illumination device and an optical filter. The illumination device emits illumination light. The illumination device projects a projection pattern onto a projection surface. The average transmittance of the optical filter in a wavelength region of the illumination light emitted from the illumination device is higher than that of the optical filter in a visible light wavelength region other than the wavelength region of the illumination light.
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Inventors:
SATO TOMOE (JP)
KURASHIGE MAKIO (JP)
NISHIO SHUMPEI (JP)
ISHIDA KAZUTOSHI (JP)
NAKATSUGAWA KAORI (JP)
SEINO HAJIME (JP)
KURASHIGE MAKIO (JP)
NISHIO SHUMPEI (JP)
ISHIDA KAZUTOSHI (JP)
NAKATSUGAWA KAORI (JP)
SEINO HAJIME (JP)
Application Number:
PCT/JP2023/016755
Publication Date:
November 02, 2023
Filing Date:
April 27, 2023
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G03B21/00; F21S2/00; F21V5/04; F21V9/00; G03B21/14; G09G5/00
Domestic Patent References:
| WO2004109390A1 | 2004-12-16 |
Foreign References:
| US20090168026A1 | 2009-07-02 | |||
| JP2021101204A | 2021-07-08 | |||
| JP2018081149A | 2018-05-24 | |||
| CN202275258U | 2012-06-13 | |||
| JP2008268878A | 2008-11-06 | |||
| JP2019023757A | 2019-02-14 | |||
| JP2016109863A | 2016-06-20 | |||
| US6428169B1 | 2002-08-06 | |||
| JP2006243227A | 2006-09-14 | |||
| JP2005151310A | 2005-06-09 |
Attorney, Agent or Firm:
MIYAJIMA Manabu et al. (JP)
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