COLOR SEPARATION COMBINING PRISM INTEGRATED WITH IMAGING LIGHT SEPARATION PRISM AND IMAGE SENSOR BUILT-IN PROJECTION TYPE IMAGE DISPLAY DEVICE INCLUDING THE SAME

• Main Authors: ONISHI YOSHINORI, YAMAMOTO NORIKAZU
• Format: Patent
• Language: English; Japanese
• Published: 15.06.2023
• 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; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

To provide a color separation combining prism integrated with imaging light separation prism capable of suppressing heat generation or thermal deformation of the imaging device or imaging optical system due to DMD-OFF light in an image sensor built-in projection type image display device.SOLUTION: A disclosed color separation combining prism integrated with imaging light separation prism includes: a color separation/synthesis prism that guides multiple pieces of light, each of which has a given wavelength band obtained by color-separating illumination light in the visible light region separately, to multiple light modulators, light reflected by each of the multiple light modulators is guided along an optical axis to generate projection light that propagates in a direction of the projection optical system on a front side of the optical axis, and outputs the projection light obtained by color-combining the projection light to the projection optical system along the optical axis; and an imaging light-separation prism formed integrally with the color separation/synthesis prism. The imaging light separation prism is configured to receive imaging light incident from the projection optical system and propagate in a direction of a rear side of the optical axis opposite to the front side of the optical axis, and to guide at least part of the imaging light to an image sensor.SELECTED DRAWING: Figure 3 【課題】撮像素子内蔵型投写型映像表示装置におけるＤＭＤ－ＯＦＦ光による撮像素子又は撮像光学系の発熱又は熱変形を抑制することができる撮像光分離プリズム一体型色分離合成プリズムを提供する。【解決手段】本発明に係る撮像光分離プリズム一体型色分離合成プリズムは、可視光域の照明光を色分離して得られた、それぞれが所定の波長帯域を有する複数の光を、複数の光変調素子に別々に導き、複数の光変調素子のそれぞれで反射した光を光軸に導いて光軸の前方側の投写光学系の方向に伝搬される投射光を生成し、投射光を色合成した投影光を光軸に沿って投写光学系へ出力する色分離合成プリズムと、色分離合成プリズムと一体的に形成された撮像光分離プリズムと、を備え、撮像光分離プリズムは、投写光学系から入射し、光軸の前方側に対向する光軸の後方側の方向に伝搬される撮像光を受光し、撮像光の少なくとも一部を撮像素子へ導くように構成されている。【選択図】図３