LIGHT-SOURCE DEVICE AND PROJECTOR

• Main Author: EGAWA AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 30.11.2017
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; BASIC ELECTRIC ELEMENTS; BLASTING; CINEMATOGRAPHY; DEVICES USING STIMULATED EMISSION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; HOLOGRAPHY; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a light-source device having a structure which can suppress a reduction in efficiency for light utilization.SOLUTION: A light-source device comprises: a base substrate 11 having a first face; a semiconductor laser element 110 being disposed on the first face and emitting laser light L in a first direction along the first face; and a prism 113 having an incident face 113a to which the laser light emitted from the semiconductor laser element is incident and a reflection surface 113b reflecting at least a part of the laser light incident from the incident face. When the base of a natural logarithm is denoted by "e", the reflection face is disposed so as to totally reflect the laser light having light intensity equal to or larger than 1/eof center intensity out of the laser light incident to the prism from the incident face.SELECTED DRAWING: Figure 5 【課題】光利用効率が低下することを抑制できる構造を有する光源装置を提供する。【解決手段】光源装置は、第１の面を有するベース基板１１と、第１の面に配置され、第１の面に沿った第１方向にレーザー光Ｌを射出する半導体レーザー素子１１０と、半導体レーザー素子から射出されるレーザー光が入射する入射面１１３ａ、および入射面から入射したレーザー光の少なくとも一部を反射する反射面１１３ｂを有するプリズム１１３と、を備え、反射面は、自然対数の底をｅとしたとき、入射面からプリズムに入射したレーザー光のうち、光強度が中心強度の１／ｅ２以上となるレーザー光を全反射するように配置されていることを特徴とする。【選択図】図５