Patent ID: 8724185
Filing Date: 2014-05-13
Classification: F21V,G02B,H04N

Abstract:
1. A light guide member which is used by being combined with a light source that emits an illumination light, comprising: a main body part which has a long rod shape in a first direction and guides the illumination light; an entrance surface which is one end face of the main body part and through which the illumination light enters; a strip-shaped exit surface which extends in the first direction on a surface of the main body part and from which the illumination light is output; and a strip-shaped reflecting surface which extends in the first direction on a face of the main body part, the face being placed opposite to the exit surface, and which reflects the illumination light; wherein the reflecting surface includes, on a flat face, a reflection pattern surface provided with a plurality of minute reflective concave parts having a function of reflecting the illumination light toward the exit surface, and the reflective concave parts each include a deflection surface which deflects the illumination light in a direction in which a reflection angle widens in a cross sectional view in a second direction that is orthogonal to the first direction in a horizontal direction, and reflects the illumination light, wherein the reflective concave parts each have a shape of a semi-oval body, and a long diameter direction thereof extends in the second direction, and when a long diameter of the semi-oval body is d and a depth of the semi-oval body from the flat face is h, d:h is within a range of 3:1 to 15:1.