BACK-LIGHT AND LIGHTING SYSTEM USING IT

• Main Authors: ISHIWATARI TOMISHIGE, OGAWA KOZO
• Format: Patent
• Language: English
• Published: 19.06.1998
• Edition: 6
• Subjects: 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 ELEMENTS, SYSTEMS, OR APPARATUS; 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

PROBLEM TO BE SOLVED: To enhance the incident efficiency, toward a light guide plate, of the light emitted from a reflective type light source without providing any exclusively used part in the case of back-light using the reflective type light source. SOLUTION: This device 19 is provided with a light guide plate 9 for leading an incident light beam from an incident surface 12 to a luminous surface 13, a reflective type light source 14 having an opening 17 for emitting light, while being formed in a slender shape along the axial direction of a bulb 15 in a cylindrical shape, a light dispersion sheet 24 extendingly installed as if covering the opening 17 of the reflective type light source 14, and a reflective sheet 23 fixed on a surface on the opposite side of the luminous surface 13 of the light guide plate 9 and extendingly installed as if covering the opening the opening 17 of the reflective type light source 14. In such a way like this, out of the light beams emitted from the opening 17, any light beam shifted out of the incident surface 12 of the light guide plate 9 is made to reflect on the reflective sheet 23 or a light dispersion sheet 24 and can be guided to the incident surface 12, thereby, an incident light efficiency to the light guide plate 9 and the light emitting surface brightness of a back-light 22 are enhanced without providing any exclusively used part.