Title:
LIGHT-EMITTING DEVICE, SURFACE LIGHT SOURCE, LIQUID CRYSTAL DISPLAY DEVICE, AND LENS
Document Type and Number:
WIPO Patent Application WO/2012/164792
Kind Code:
A1
Abstract:
Provided are: a low-cost, energy-conserving light-emitting device having both uniform brightness and color while using a lens having a strong light-spreading power; a surface light source having this light-emitting device; a liquid crystal display device having this surface light source; and the lens arranged in the light-emitting device. The light-emitting device (1) has a plurality of light-emitting diodes (2) and the lens (3) that spreads light from these light-emitting diodes. The lens has an incident surface (31) that receives light from the light-emitting diodes having an optical axis as the center and a light-emitting surface (32) that radially spreads and emits the incident light. The incident surface has connected recessed surfaces; the light-emitting surface has connected protruding surfaces; and the lens has different refractive power in a first direction orthogonal to the optical axis and a second direction orthogonal to the optical axis and the first direction.
Inventors:
IIYAMA TOMOKO
MATSUKI DAIZABURO
MATSUKI DAIZABURO
Application Number:
PCT/JP2012/001369
Publication Date:
December 06, 2012
Filing Date:
February 29, 2012
Export Citation:
Assignee:
PANASONIC CORP (JP)
IIYAMA TOMOKO
MATSUKI DAIZABURO
IIYAMA TOMOKO
MATSUKI DAIZABURO
International Classes:
F21S2/00; F21V5/00; F21V5/04; G02B3/00; G02F1/13357; H01L33/58; F21Y101/02
Domestic Patent References:
| WO2011048735A1 | 2011-04-28 | |||
| WO2011007733A1 | 2011-01-20 |
Foreign References:
| JP2011003460A | 2011-01-06 | |||
| JP3115370U | 2005-11-04 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)
Mutsumi Sameshima (JP)
Download PDF:
Claims: