Light guide plate, surface light source device, transmission-type image display device

The present invention provides a light guide plate, a surface light source device, and a transmission-type image display device. A light guide plate is a light guide plate disposed on the back surface side of a prim plate having a plurality of prism units each extending in one direction arranged in...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KENTAROU HYAKUTA, HIROFUMI OHTA, YASUHIRO SEKIGUCHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF HEATING LIGHTING MECHANICAL ENGINEERING NON-LINEAR OPTICS NON-PORTABLE LIGHTING DEVICES OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR SYSTEMS THEREOF TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS
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Beschreibung
Zusammenfassung:	The present invention provides a light guide plate, a surface light source device, and a transmission-type image display device. A light guide plate is a light guide plate disposed on the back surface side of a prim plate having a plurality of prism units each extending in one direction arranged in a row on one surface and comprises a body having a first surface and a second surface opposing each other and an entrance surface intersecting the first and second surfaces and a plurality of lens units formed on the second surface. Each lens unit has such an outer form that a value obtained by multiplying a ratio of a luminous flux of light emitted from a point on the first surface into a predetermined direction to a luminous flux of light emitted from the point to all the directions by a light emission efficiency which is a ratio of the quantity of light emitted from the first surface to the quantity of light incident on the entrance surface is greater than 1.055%. The predetermined direction is a direction forming an angle of about 30 DEG with a normal to the first surface within a plane substantially orthogonal to the extending direction of the prism units.