2007-048883 is referenced by 12 patents.

PROBLEM TO BE SOLVED: To provide an optical element for changing the direction of light in which the occurrence of unevenness in color and light emission can be prevented while using the appropriate number of light sources depending on the scale or demand for lighting without complicating the arrangement, and to provide a light source unit for radiating light and a planar light emitting device employing it.SOLUTION: An optical element for changing the direction of light having an incident face for receiving light radiated from a light source through an incident layer, a reflective face of bugle-shape for reflecting light entering from the incident face, and a sidewall face for exiting the light reflected on the reflective face in the side face direction while refracting mixes light from a plurality of light sources and emits light from a diffuse transmission portion of the planar light emitting device. Variations are averaged in quantity of emitted light and in color, and a planar light emitting device in which unevenness in light emission and color is suppressed is obtained. Since light is exited from a light source unit for radiating light in the lateral direction, an arrangement especially suitable for thinning and high output can be attained.

Title
Optical element for changing direction of light, light source unit for radiating light, and planar light emitting device employing it
Application Number
2005-230884
Publication Number
2007-048883
Application Date
August 9, 2005
Publication Date
February 22, 2007
Inventor
Yamada Tomohiro
Kawamata Masatoshi
Nishikawa Akihiro
Yoshikawa Yukio
Aoki Kazuo
Assignee
Koha
IPC
F21Y 101/02
F21V 05/04
F21S 08/04
F21S 02/00
H01L 33/00