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Title:
ILLUMINATION LENS, ILLUMINATION UNIT, AND HEAD-UP DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/107883
Kind Code:
A1
Abstract:
This illumination lens (4) illuminates a display by concentrating light from a light source (3) and radiating the result at the display. The illumination lens (4) is provided with: a plurality of first lens surfaces (40) having a shape extracting a plurality of sections along a first optical axis (L1) from a first virtual lens surface of which at least a second order differential is possible between optical axes (L1, L2) arranged in a baseline direction (X) and stipulating the first optical axis (L1) at which the light source (3) is disposed; and a plurality of second lens surfaces (41) having a shape extracting a plurality of sections along a second optical axis (L2) from a second virtual lens surface of which at least a first order differential is possible between optical axes (L1, L2) arranged in the baseline direction (X) and stipulating the second optical axis (L2). In the baseline direction (X), the first lens surfaces (40) and second lens surfaces (41) are arrayed in alternation. As a result, it is possible to suppress brightness unevenness in the illumination by outgoing light.

Inventors:
NAMBARA, Takahiro (C/O DENSO CORPORATION, 1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
Application Number:
JP2015/000093
Publication Date:
July 23, 2015
Filing Date:
January 12, 2015
Export Citation:
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Assignee:
DENSO CORPORATION (1-1 Showa-cho, Kariya-city Aichi, 61, 〒4488661, JP)
International Classes:
F21V5/04; B60K35/00; F21S2/00; G02B3/06; G02B3/08; G02B19/00; G02B27/01; F21Y101/02
Foreign References:
JP2009258621A2009-11-05
JP2009109780A2009-05-21
JP2009169399A2009-07-30
JP2008071716A2008-03-27
JP2012032537A2012-02-16
Attorney, Agent or Firm:
KIN, Junhi (6th Floor, Takisada Bldg. 2-13-19, Nishiki, Naka-ku, Nagoya-cit, Aichi 03, 〒4600003, JP)
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