OPTICAL ELEMENT FOR LED, AND LED ILLUMINATION DEVICE

• Main Authors: MIMORI MITSURU, TATEYAMA KIYONO, ONO YUKI, NOMURA EIJI
• Format: Patent
• Language: English
• Published: 05.06.2014
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; LIGHTING; MECHANICAL ENGINEERING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

PROBLEM TO BE SOLVED: To provide an optical element that is thin, increases the light utilization efficiency while suppressing the heat deformation, and can reduce the color unevenness, and to provide a low-height LED illumination device using the optical element.SOLUTION: Light emitted from a yellow phosphor 2d of an LED 2 comes from an incidence plane 1a as shown by a solid line, then comes to an outgoing surface 1b, is totally reflected on it, and goes to a bottom surface 1d side. The reflected light is reflected on an outward surface 1go of a recess 1 g, and goes via a flange surface 1f or the outgoing surface 1b. Thus, the light utilization efficiency can be increased and the color unevenness can be suppressed.