HEAD-UP DISPLAY DEVICE AND REFLECTIVE OPTICAL SYSTEM

Japanese Patent JP2017044858

A

PROBLEM TO BE SOLVED: To provide a technology for suppressing changes in chromaticity while reducing damages in a display device by sun rays.SOLUTION: A head-up display device 1 includes an illumination optical system 22, an imaging optical system 10 and a reflective optical system 34. The illumination optical system 22 projects light source light representing information. The imaging optical system 10 projects the light source light projected by the illumination optical system 22 onto a projection plane. The reflective optical system 34 includes a dielectric multilayer film that transmits electromagnetic waves in an infrared region and reflects electromagnetic waves in a visible light region. The reflective optical system 34 is configured to give a retardation within a range of larger than -π/2 [rad] and smaller than π/2 [rad] at target wavelengths including at least a part of the wavelengths in the light source light from the illumination optical system 22. The reflective optical system 34 is disposed on a path of the light source light from the illumination optical system 22 to the imaging optical system 10 in such a manner that an angle α (degree) of a polarization axis of the light source light from the illumination optical system 22 with respect to an incidence plane satisfies 0<α<90 or 90<α<180.SELECTED DRAWING: Figure 1

YOKOE JUNYA
NAMBARA TAKAHIRO

JP2015166958A

March 02, 2017

August 26, 2015

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DENSO CORP

G02B27/01; B60K35/00

JP2015007763A	2015-01-15
JP2006039029A	2006-02-09
JP2007052383A	2007-03-01

DE1115657B

1961-10-19

Nagoya International Patent Service Corporation

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