COLOR SEPARATION OPTICAL SYSTEM

• Main Author: OMURO TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 02.11.2017
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PROBLEM TO BE SOLVED: To provide a color separation optical system that reduces an interference fringe ghost to be observed on a monitor screen when a subject is high in luminance.SOLUTION: A color separation prism, which divides an incident light flux into a plurality of light fluxes, and guides the plurality of light fluxes to a solid state image pick-up element arranged at respective optical paths, has: a first prism that includes a first reflection surface 3 reflecting a first light flux and transmitting a second light flux, and guides the first light flux to a first solid state image pick-up element; a second prism that includes a second reflection surface 7 arranged across an air gap with respect to the first reflection surface, and reflecting the second light flux incident from the air gap, and guides the second light flux reflected upon the second reflection surface and reflected upon a surface contacting with the air gap to a second solid state image pick-up element different from the first solid state image pick-up element; and an edge filter 9 that is made up of a dielectric substance passing a green and red to an incident surface of the second prism, and blocking an IR.SELECTED DRAWING: Figure 1 【課題】被写体が高輝度のときには、モニター画面上で観察される干渉縞ゴーストを低減した色分解光学系を提供する。【解決手段】入射光束を複数の光束に分割し、該複数の光束をそれぞれの光路に配置された固体撮像素子へ導く色分解プリズムであって、第１の光束を反射し第２の光束を透過する第１反射面３を備え、前記第１の光束を第１の固体撮像素子へ導く第１プリズムと、前記第１反射面に対して空隙を挟んで配置されており、前記空隙から入射した前記第２の光束を反射する第２反射面７を備え、前記第２反射面で反射し前記空隙に接する面で反射した前記第２の光束を前記第１の固体撮像素子とは異なる第２の固体撮像素子へ導く第２プリズムと、を有し、前記第２プリズムの入射面に緑と赤を通し、赤外を阻害する誘電体よりなるエッジフィルタ９を有することを特徴とする。【選択図】図１