Patent ID: 8911128
Filing Date: 2014-12-16
Classification: B82Y,F21S,H01L,H01S

Abstract:
1. A light projection unit that projects light in a predetermined direction, the light projection unit comprising: a light collection member that includes a light entrance surface which laser light enters, and a light emission surface which has an area smaller than an area of the light entrance surface and from which the laser light is emitted; a fluorescent member that includes an incident surface on which the laser light emitted from the light collection member is incident, that converts at least a part of the laser light into fluorescent light and that mainly emits the fluorescent light from the incident surface; and a light projection member that projects the fluorescent light emitted from the fluorescent member, wherein the light collection member has a function of changing, therewithin, a direction of travel of the laser light entering the light entrance surface and of guiding the laser light to the light emission surface, the light emission surface of the light collection member is arranged a predetermined distance away from the incident surface of the fluorescent member, the incident surface is planar, and a center axis at a light emission end of the light collection member is inclined at an angle that is equal to or more than 10 degrees and equal to or less than 30 degrees with respect to a normal to the planar incident surface of the fluorescent member.