SURFACE LIGHT SOURCE UNIT AND DEVICE USING THE UNIT

Title:

SURFACE LIGHT SOURCE UNIT AND DEVICE USING THE UNIT

Document Type and Number:

WIPO Patent Application WO/2005/050085

Kind Code:

A1

Abstract:

Glaring and uneven luminance on a screen is limited when used for image displaying for a liquid crystal display unit or the like. A surface light source unit comprising a light emitting unit (22) using an LED or the like, and a light guide plate (23) for guiding light emitted from the light emitting unit (22) to spread it over the entire light output surface, wherein many deflection patterns (34) are provided on the rear surface of the light guide plate (23), and the deflection patterns (34) are used for reflecting a light in the light guide plate (23) to enable the light to be outputted from the light outputting surface of the light guide plate (23). When a polar coordinate using as the origin the center point set in the vicinity of one corner of the light guide plate is assumed, a location point (Rm, Ѳm) of a deflection pattern (34) is expressed in the following expressions (Ro > 0). Rm= Rm-1 + (1/Rm-1) Ѳm= Ѳm-1 + 137.5°

Inventors:

SHINOHARA MASAYUKI (JP)
HIROTA KAZUHIDE (JP)

Application Number:

PCT/JP2004/016873

Publication Date:

June 02, 2005

Filing Date:

November 12, 2004

Export Citation:

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Assignee:

OMRON TATEISI ELECTRONICS CO (JP)
SHINOHARA MASAYUKI (JP)
HIROTA KAZUHIDE (JP)

International Classes:

G02B6/00; F21S2/00; F21S8/04; F21V8/00; G02F1/13357; G09F9/00; G09F13/18; F21Y101/02; (IPC1-7): F21S2/00; F21V8/00; G02B6/00; G09F9/00; G02F1/3357

Domestic Patent References:

WO2002089222A1

2002-11-07

Foreign References:

JPH08146223A	1996-06-07
JP2003057448A	2003-02-26
JP2002296425A	2002-10-09
JP2001243822A	2001-09-07
JP2002094129A	2002-03-29
JP2001273805A	2001-10-05
JPS6075907U	1985-05-28
JP2001243822A	2001-09-07

Other References: