JP2009037116A5 - - Google Patents

Claims (8)

A recess for displaying the design is formed on the back surface, and a plate-shaped light guide for displaying the design from the light emitting surface opposite to the back surface based on incident light from the end face in the longitudinal direction;
A light source for allowing light to enter the longitudinal end face of the light guide,
The light emitting device according to claim 1, wherein at least a part of an end surface in a short direction of the light guide is roughened. The light-emitting device according to claim 1, wherein at least a part of an end surface in the short-side direction of the light guide is roughened by blasting. At least a part of the end surface is roughened by arranging a plurality of grooves in the longitudinal direction in the direction connecting the back surface and the light emitting surface on at least a part of the end surface in the short direction of the light guide. The light emitting device according to claim 1, wherein the light emitting device is provided . The groove is recessed substantially in a V shape from the end face in the short direction, and a portion facing the end face where light enters from the light source is at an angle greater than 0 ° and 45 ° or less from the end face in the short direction. The light- emitting device according to claim 3, wherein the light-emitting device has an inclined surface toward the inside of the light body. The plurality of grooves include at least first and second grooves that are adjacent to each other in the longitudinal direction, and third and fourth grooves that are closer to the light source than the first and second grooves. And
5. The light emitting device according to claim 3, wherein an interval between the first groove and the second groove is narrower than an interval between the third groove and the fourth groove. The plurality of grooves include at least a fifth groove and a sixth groove closer to the light source than the fifth groove,
The light emitting device according to claim 3, wherein the fifth groove is deeper than the sixth groove. A plurality of the recesses are arranged in the longitudinal direction on the back surface of the light guide, and the end surface in the short direction of the light guide is roughened at a position corresponding to each of these recesses. The light emitting device according to any one of claims 1 to 6. The end surface in the short direction of the light guide is roughened by blasting at a position corresponding to each of the plurality of recesses, and blasting of the intermediate portion in the longitudinal direction is performed on the long side in each roughened portion. The light-emitting device according to claim 7, wherein the light-emitting device is stronger than blasting at both ends in the direction.