Title:
HEAD-UP DISPLAY
Document Type and Number:
WIPO Patent Application WO/2017/125979
Kind Code:
A1
Abstract:
A head-up display according to the present invention is provided with an optical system that emits light toward an eye box (80), said light forming a projected image, said eye box (80) being a prescribed range in which an observer's eyes are assumed to be. The optical system includes a Fresnel lens (150) that has, on the exit side thereof, a jagged surface with a sawtooth-shaped cross-section, said jagged surface being concentrically formed with an optical axis (A) at the center thereof and being formed with first surfaces (151a) and second surfaces (151b) in an alternating arrangement, said first surfaces (151a) acting as light-concentrating surfaces that concentrate incident light toward a focal point, said second surfaces (151b) acting as wall surfaces that do not concentrate light toward a focal point. The second surfaces (151b) are formed at a slant with respect to the optical axis (A) of the Fresnel lens (150), at such an angle that light hitting the second surfaces (151b) is reflected in directions leading out of the range of the eye box (80).
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Inventors:
KASAZUMI KEN'ICHI
MORI TOSHIYA
OKAYAMA HIROAKI
KUZUHARA SATOSHI
ASAI YOSUKE
MORI TOSHIYA
OKAYAMA HIROAKI
KUZUHARA SATOSHI
ASAI YOSUKE
Application Number:
PCT/JP2016/005048
Publication Date:
July 27, 2017
Filing Date:
December 02, 2016
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B27/01; B60K35/00; G02B3/08
Foreign References:
| JP2015184432A | 2015-10-22 | |||
| JP2014191285A | 2014-10-06 | |||
| JPH09218465A | 1997-08-19 | |||
| JP2013137442A | 2013-07-11 | |||
| JP2005084172A | 2005-03-31 | |||
| JPH0875906A | 1996-03-22 |
Attorney, Agent or Firm:
KAMATA, Kenji et al. (JP)
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