OPTICAL CONTROL SHEET AND SURFACE LIGHT EMITTING DEVICE PROVIDED THEREWITH

• Main Authors: YOKOTA TOMOHIRO, OGAWARA HIROSHI, MAKINO SHINZO, NISHITANI FUMIO
• Format: Patent
• Language: English
• Published: 23.06.1995
• 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

PURPOSE:To provide an optical control sheet having light condensing property by which a front direction becomes very bright in the case of using the sheet in a liquid crystal display, a liquid crystal television or an electric decorative sign, viewed to be equally bright in every direction within the range of the angle of visibility to a certain extent and having no projection loss; and a surface light emitting device provided with the sheet. CONSTITUTION:As for the optical control sheet 10, many nearly pyramid-shaped projections 11 are adjacently formed at least on its one surface. It is desirable that the apex angle alpha of the projection 11 is >=70 deg. and <=120 deg., and it is desirable that the length (a) of the diagonal of the base 13 of the projection 11 is >=30mum and <=150mum. Then, it is desirable that a distance (b) between the bases 13 of the adjacent projections 11 is <=10mum. It is conceivable to round the apex 12 of the projection 11. The surface light emitting device is provided with the sheet 10.