ALARM

• Main Author: HIGUCHI HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 28.09.2017
• Subjects: ALARM SYSTEMS; ORDER TELEGRAPHS; PHYSICS; SIGNALLING; SIGNALLING OR CALLING SYSTEMS

PROBLEM TO BE SOLVED: To provide an alarm high in the visibility of light of a light emitting part capable of efficiently emitting light much from the light emitting part to the outside of the housing without extremely restricting the design of the periphery.SOLUTION: A housing 1 comprises: a housing 1; a light emission part 2 stored inside the housing 1; and a light guide part 3 for guiding light from the light emission part 2 to the outside of the housing 1. The light guide part 3 includes: a light incident end face 3a to which light emitted from the light emission part 2 is incident; a light emission end face 3b exposed on a part of the surface of the housing and emitting transmitted light from a light incident end face 3a; and a taper part 3 whose cross-section becomes enlarged as it goes from the incident end face 3a side to the emission end face 3b side. The incident end face 3a is larger than a size of the cross-section at a position of an assumed cone C or a pyramid by connecting the outer periphery of the incident end face 3b and the light emission part 2. A side face of the taper part is inclined by an angle whose incident angle to the side face of the taper part of the transmitted light from the incident end face 3a is equal to or more than a critical angle.SELECTED DRAWING: Figure 4 【課題】発光部からの光を周囲の設計を過度に制限することなく多く効率的に筐体の外部に放射することができる、発光部の光の視認性の高い警報器を提供する。【解決手段】本発明の警報器は、筐体１と、筐体１内に収容された発光部２と、発光部２からの光を筐体１の外部に導くライトガイド３とを有し、ライトガイド３は、発光部２で発が入射する入射端面３ａと、筐体１の表面の一部に露出していて入射端面３ａからの透過光が外部に放出される放射端面３ｂと、入射端面３ａ側から放射端面３ｂ側に向かうにつれて断面が拡大するテーパー部とを有し、入射端面３ａは、放射端面３ｂの外周と発光部２とを結ぶことにより仮想される錐体Ｃまたは錘台の入射端面３ａの位置での断面の大きさよりも大きく、テーパー部の側面は、入射端面３ａからの透過光のテーパー部の側面への入射角が臨界角以上となる角度で傾斜している。【選択図】図４