Title:
SURFACE LIGHT SOURCE DEVICE AND DISPLAY USING THE SAME
Document Type and Number:
Japanese Patent JP2016062703
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a surface light source device reduced in the light loss when light is incident on a light guide plate.SOLUTION: A surface light source device comprises: a punctiform light source; and a light guide plate having a quadrangle plan view shape, an entrance surface which is one of edge faces of the quadrangle plan view shape facing the punctiform light source, and an emission surface normal to the entrance surface, in which the light guide plate includes a convex structure in that an end marginal part on the incident face side projects from other portions. The convex structure includes: two inclination curve surfaces that correspond to part of a lateral face of an oblique circular cylinder; an oblique circular cylinder part continuous with the inclination curve surface and including a top face of the inclination curve surface that corresponds to part of the edge face of the oblique circular cylinder; and a wedge-shaped part including an oblique plain face inclined so as to descend from the incident face side, in which the oblique circular cylinder part is disposed on the oblique plain face of the wedge-shaped part; the two inclination curve surfaces are disposed in parallel to each other such that the respective lateral faces intersect along the cylindrical axis of the oblique circular cylinder; and the convex structure is disposed such that the intersection of the two inclination curve surfaces and the center of the punctiform light source exist on the same straight line in plan view.SELECTED DRAWING: Figure 1
Inventors:
ITOGA KENJI
YUKI AKIMASA
SATAKE TETSUYA
TAKAIRA KAZUTADA
SAKAI SEIJI
YUKI AKIMASA
SATAKE TETSUYA
TAKAIRA KAZUTADA
SAKAI SEIJI
Application Number:
JP2014188471A
Publication Date:
April 25, 2016
Filing Date:
September 17, 2014
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
F21S2/00; G02F1/13357
Domestic Patent References:
| JP2012109104A | 2012-06-07 | |||
| JP2008015467A | 2008-01-24 |
Foreign References:
| WO2014041828A1 | 2014-03-20 |
Attorney, Agent or Firm:
Yoshitake Hidetoshi
Takahiro Arita
Takahiro Arita