STRUCTURE OF LENS FOR ILLUMINATION

• Main Author: SHIMURA TAKASHI
• Format: Patent
• Language: English
• Published: 24.05.2007
• Subjects: BLASTING; 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; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

PROBLEM TO BE SOLVED: To provide a structure of a leans for illumination capable of varying directivity only by rotating a lens by forming a plurality of curved surfaces of different curvatures on a single lens, and arranging a light source at one vertex of the lens. SOLUTION: An LED chip 3 is mounted on a printed board 2, and a lens 1 having a directivity in the light emitting direction of the LED chip 3 is arranged on the front surface of the LED chip 3. The lens 1 is a regular tetrahedron comprising four vertexes, a, b, c, and d. Four curved surfaces A, B, C, and D consisting of different curvatures A1, B1, C1, and D1 are formed through three vertexes within the four vertexes a, b, c, and d. The LED chip 3 is arranged near one arbitrary vertex among the four vertexes, with the lens being held/fixed by other three vertexes. Only by rotation a single lens, light is emitted from the curved surfaces of different curvature to vary directivity. COPYRIGHT: (C)2007,JPO&INPIT