BACK LIGHT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE BACK LIGHT

• Main Authors: ISHIWATARI TOMISHIGE, YAJIMA JUN
• Format: Patent
• Language: English
• Published: 15.07.1997
• Edition: 6
• Subjects: 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; 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; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To easily execute angle setting work for a reflection type light source having an aperture part and to uniform the luminance of emitted light. SOLUTION: A light source unit 3 arranged on the end face of a photoconductive unit 2 is formed by a reflection type light source 17, a lamp holder 18 for holding the light source 17 and a lamp cover 19 for fixing the holder 18. The holder 18 has a shape to be fixed to the cover 19 so as not to move its position by providing the holder 18 with directivity. A positioning means 24 positions the light source 17 to the holder 18 on a position where the aperture part of the light source 17 is accurately opposed to the end face of a photoconducting plate 5. Since the light source 17 is positioned on the holder 18 by the means 24, the holder 18 is fixed to the cover 19 and the cover 19 is arranged on its arrangement position, the light source 17 can be easily and correctly positioned, so that the luminance of emitted light can be uniformed.