A DISC-SHAPED LIGHT REFLECTING PLATE WITH VARIABLE SECTION UNEQUILATERAL RIGHT TRIANGLES PRISMS AND A LAMP MADE THEREFROM

摘要

A disc-shaped light reflecting plate (1) with variable section right triangles prisms, on one surface (12) of which a plurality of annular prisms (2) are privded in a radial direction from a central axis. The section of each prism (2) is an unequilateral right triangle, its vertex angle is 90o, and the angle between adjacent prisms (2) is a right angle. The section area of the prisms (2) is degressive from the centre to the periphery. The light source of a lamp made from the light reflecting plate (1) is provided in the circle side surface of the light reflecting plate (1).