Planar Illumination Light Source Device and Planar Illumination Light Device Using The Planar Illumination Light Source Device

• US 20090003002A1
• Filed: 01/22/2007
• Published: 01/01/2009
• Est. Priority Date: 01/27/2006
• Status: Active Grant

• Current Assignee: OPTO Design, Inc.
• Original Assignee: OPTO Design, Inc.
• Inventors: Sato, Eiichi
• Granted Patent: US 7,726,828 B2
• Time in Patent Office: Days
• US Class Current: 362/341
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 3/0297 including a machine-readable marking, e.g. a bar code digitally marked record carriers in general G06K19/00

Abstract

The present invention provides a planar illumination light source device by which uniform illumination light can be obtained over a wide area without increasing the thickness of LEDs in the radiation direction even when a highly directional light source such as LEDs is used, and a planar illumination device using this. The present invention includes a highly directional light source, a light guiding body having a radiation plane in a radiation direction of the light source, a casing that encloses the light source and seals planes other than the radiation plane of the light guiding body, inside reflection means provided in the entirety of the area between the casing and the light guiding body, and radiation side reflection means provided on the radiation plane and reflecting light from the light source at a prescribed ratio. A light emitting diode group consisting of one or a plurality of light emitting diodes is used as the highly directional light source.

Claims

1. A planar illumination light source device, comprising:

a light source configured by combining one or a plurality of light emitting bodies that emit light;

a rectangular and open casing having a bottom plane and a side plane reflecting light from the light source; and

a radiation side reflection member provided so that it covers an opening portion of the open casing and so that light transmittance increases as it gets farther from the light source, wherein;

the light source includes;

a light source device module which is provided at

a center of the bottom plane and in which light from the light source is reflected in a manner of multipath reflection in the casing; and

a light diffusion plate provided above the radiation side reflection member with a space therebetween.

16. A planar illumination light device, wherein:

a plurality of the light source device modules according to claim 1 are arranged on one and the same plane; and

a light diffusion plate is arranged above the plurality of light source device modules.

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15. A light source device module, comprising:

a light source configured by combining one or a plurality of light emitting bodies that emit light;

a radiation side reflection member evenly coated on a light transmissive substrate and reflecting/transmitting light from the light source;

a rectangular and open casing having a bottom plane and a side plane reflecting light from the light source, wherein;

the light source is arranged generally at a center of the bottom plane;

a central reflection part is formed on the light transmissive substrate generally at a center of the light source; and

light from the light source is reflected in a manner of multipath reflection in the open casing.

49. A light source device module according to claim 15, wherein:

a thickness of the central reflection part is adjusted so that a light amount can be adjusted.

50. A light source device module according to claim 15, wherein:

an opening is formed on the central reflection part so that an area of the opening is adjusted and light amount can be adjusted.

51. A light source device module, wherein:

the light source according to claim 15 includes a linear-light source or many light sources.

17. A planar illumination light source device, comprising:

a light source configured by combining one or a plurality of light emitting bodies, having an output characteristic in which, when a plane disposed on a position distant from the light source by a prescribed length directly receives the light output from the light source, reception light intensity distribution on the plane represents a maximum value at a reference point that is closest to the light source, and as it gets farther from the reference point, the reception right intensity distribution decreases;

a rectangular and open casing having a bottom plane and a side plane for reflecting light from the light source; and

a radiation side reflection member provided so that it covers an opening portion of the open casing and so that light transmittance increases as it gets farther from the light source, wherein;

the light source includes;

a light source device module which is provided at a center of the bottom plane and in which light from the light source is reflected in a manner of multipath reflection in the casing; and

a light diffusion plate provided above the radiation side reflection member with a space therebetween.

28. A planar illumination light device, wherein:

a plurality of the light source device modules according to claim 17 are arranged on one and the same plane; and

a light diffusion plate is arranged above the plurality of light source device modules.

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