Patent ID: 8061876

Claim:
An illumination device comprising: a receiving concave portion comprising a light reflecting plate or a combination of the light reflecting plate and a circuit board; and a point like light source, arranged in the receiving concave portion, wherein the point like light source emits a light with a brightness up to 30000 candelas per square meter (cd/m 2 ), wherein the brightness is defined as a value measured by a glare measuring instrument when a distance from a top portion of the illumination device to a measuring portion of the glare measuring instrument is 350 millimeters (mm) and an incident angle of the light on the glare measuring instrument is zero, wherein a part or all of the light emitted from the point like light source is scatter-reflected from an inner face of peripheral walls of the receiving concave portion and supplied as an illumination, and wherein the receiving concave portion is formed as a reverse multi sided pyramid or a reverse multi sided pyramid with a top thereof removed.