SURFACE LIGHT EMITTING DEVICE

PROBLEM TO BE SOLVED: To increase the amount of light emitted to the outside of a light guide plate held at a distance from a light source, if the density of projections provided on the light guide plate is given stepless differences, by preventing the projections from fluctuating in shape with posi...

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Bibliographische Detailangaben
Hauptverfasser:	ONO MASAFUMI, KATO NORIMICHI, YAMAGAMI TAKEHARU, YOSHIKAWA YUKIO, TOMOSADA KEIICHIROU
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING BLASTING CRYPTOGRAPHY 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 DISPLAY DISPLAYING EDUCATION FREQUENCY-CHANGING FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF HEATING LABELS OR NAME-PLATES LIGHTING MECHANICAL ENGINEERING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SEALS SIGNS STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To increase the amount of light emitted to the outside of a light guide plate held at a distance from a light source, if the density of projections provided on the light guide plate is given stepless differences, by preventing the projections from fluctuating in shape with position, and making the intervals between the adjacent projections smaller for an increase in the density at which the projections are arranged. SOLUTION: In a surface light emitting device in which a number of projections 6 to be arranged in a high density roughly proportional to the distance from a light source are formed to provide uniform illuminance over an entire surface, die recesses 102 for forming the projections 6 are injection molded from a light-transmitting resin material using a molding die 101 machined by a cutting tool 30 having an apex angel θ, so that incident light which is incident at a critical angle or less that is determined by the resin material is reflected by the projections 6.