| US 7,484,873 B2 | ||
| Illumination device having elliptical body and display device using the same | ||
| Norihiro Dejima, Chiba (Japan); Makoto Kurihara, Chiba (Japan); Takayasu Sado, Chiba (Japan); and Katsunori Honma, Chiba (Japan) | ||
| Assigned to Seiko Instruments Inc., (Japan) | ||
| Filed on Aug. 23, 2005, as Appl. No. 11/209,925. | ||
| Claims priority of application No. 2004-245237 (JP), filed on Aug. 25, 2004; and application No. 2005-210871 (JP), filed on Jul. 21, 2005. | ||
| Prior Publication US 2006/0062016 A1, Mar. 23, 2006 | ||
| Int. Cl. F21V 7/08 (2006.01) | ||
| U.S. Cl. 362—606 [362/610] | 16 Claims |
| 1. A display device, comprising:
a non-self light emitting type display element; and an illumination device for illuminating the display element, the illumination
device comprising
a light source;
a light guide plate having a light emitting surface;
a light incident body having a first end portion that has a light incident surface on which light from the light source is
incident, and an outer surface portion a part of which has an elliptical shape, the light guide plate and the light incident
body being made of the same material; and
a coupling portion disposed between the light incident body and the light guide plate;
wherein opposed surface portions of the light guide plate and opposed elliptical surface portions of the light incident body
are respectively coupled by opposed planar surface portions that define a wedge shape having a tapered thickness that decreases
from the light incident body towards the light guide plate, the planar surface portions being tangential to respective elliptical
surface portions of the light incident body.
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