PROJECTOR

• Main Authors: SHISHIDO YOICHI, NARIMATSU SHUJI
• Format: Patent
• Language: English; Japanese
• Published: 23.09.2016
• 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; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To provide a projector capable of improving utilization efficiency of light.SOLUTION: A projector includes: a light source device 31A; three light modulation devices 35; a dichroic prism 34 that separates three color beams from light entering the inside through an incident and outgoing surface 3411 to make them enter the light modulation devices 35 respectively and that synthesizes the color beams respectively entered from the light modulation devices 35 to emit them from the incident and outgoing surface 3411; and a projection optical device 36 for projecting synthesized light. The dichroic prism 34 has: first to third prisms 341-343; a first color separation layer 344 located between the first and second prisms 341, 342; and a second color separation layer 345 located between the second and third prisms 342, 343. Incident angles of light respectively to the color separation layers 344, 345 are different from each other. The color beams separated by the color separation layers 344, 345 are set, based on the incident angles of light respectively to the color separation layers 344, 345 and a wavelength distribution of light emitted from the light source device 31A.SELECTED DRAWING: Figure 1 【課題】光の利用効率を向上させることができるプロジェクターを提供すること。【解決手段】光源装置３１Ａと、３つの光変調装置３５と、入出射面３４１１を介して内部に入射される光から３つの色光を分離して各光変調装置３５に入射させ、各光変調装置３５から入射される各色光を合成して入出射面３４１１から出射するダイクロイックプリズム３４と、合成された光を投射する投射光学装置３６と、を備え、ダイクロイックプリズム３４は、第１〜第３プリズム３４１〜３４３と、第１及び第２プリズム３４１，３４２間に位置する第１色分離層３４４と、第２及び第３プリズム３４２，３４３間に位置する第２色分離層３４５と、を有し、各色分離層３４４，３４５への光の入射角はそれぞれ異なり、各色分離層３４４，３４５により分離される色光は、各色分離層３４４，３４５への光の入射角と、光源装置３１Ａからの出射光の波長分布と、に基づいて設定される。【選択図】図１