Patent ID: 8070342

Claim:
An illuminating device comprising: a board; a light-emitting diode mounted on a surface of the board, the light-emitting diode having an optical path parallel to the surface of the board, the light-emitting diode configured to emit light having a high directivity; a translucent optical member placed on the optical path of the light-emitting diode, the translucent optical member having an incident surface opposed to a front of the light-emitting diode, the incident surface including lines of protrusions over a range wider than the optical path, the protrusions extending in a vertical direction perpendicular to the surface of the board, the protrusions configured to reflect a part of the light; and a light collector member placed along the surface of the board, the light collector member having a reflecting surface opposed to the incident surface at a back of the light-emitting diode the reflecting surface configured to reflect, toward the incident surface, the light reflected from the incident surface over a range wider than the optical path based on jaggedness resulting from the lines of the protrusions.