Title:
A lens for lighting, a lighting unit, and a head up display device
Document Type and Number:
Japanese Patent JP6237249
Kind Code:
B2
Abstract:
An illumination lens condenses a light from a light source and emits the light toward a display to illuminate the display. The illumination lens includes multiple first lens surface parts having a shape obtained by extracting multiple portions of a first virtual lens surface along a first optical axis, the first virtual lens surface defining the first optical axis on which the light source is disposed and being at least twice differentiable between optical axes arranged in a reference direction, and multiple second lens surface parts having a shape obtained by extracting multiple portions of a second virtual lens surface along a second optical axis, the second virtual lens surface defining the second optical axis and being at least once differentiable between the optical axes arranged in the reference direction. The first lens surface parts and the second lens surface parts are alternately arranged in the reference direction.
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Inventors:
Takahiro Minamihara
Application Number:
JP2014005371A
Publication Date:
November 29, 2017
Filing Date:
January 15, 2014
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F21V5/04; F21S2/00; G02B3/06; G02B3/08; G02B19/00; G02B27/01; H04N5/64
Domestic Patent References:
| JP2009258621A | ||||
| JP2009109780A | ||||
| JP2009169399A | ||||
| JP2008311032A | ||||
| JP2002352611A | ||||
| JP201232536A | ||||
| JP2009175597A |
Attorney, Agent or Firm:
Kazuyuki Yahagi
Taihei Nonobe
Takanori Kubo
Taihei Nonobe
Takanori Kubo