OPTICAL ELEMENT, EYEPIECE OPTICAL SYSTEM HAVING THE SAME, AND IMAGE DISPLAY DEVICE

• Main Author: SAKAI YOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 14.12.2023
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide an optical element that can enable a light beam with a wide angle of view to reach the pupil of an observer.SOLUTION: An optical element guides a light beam from an image display element to the pupil of an observer, and the optical element has a first deflection unit that makes the light beam incident on an inner face of the optical element; a second deflection unit that deflects the light beam totally reflected on the inner face multiple times to emit the light beam toward the pupil; and a semi-transmission and reflection unit that includes a first semi-transmission and reflection surface and a second semi-transmission and reflection surface, which are arranged in order from a side of the first deflection unit to a side of the second deflection unit. The second semi-transmission and reflection surface reflects part of the light beam from the first semi-transmission and reflection surface to the side of the first semi-transmission and reflection surface.SELECTED DRAWING: Figure 4 【課題】広画角の光束を観察者の瞳まで到達させることが可能な光学素子を提供すること。【解決手段】光学素子は、画像表示素子からの光束を観察者の瞳に導光する光学素子であって、光束を偏向して光学素子の内面に入射させる第１偏向部と、内面で全反射した光束を複数回偏向することで瞳の側へ射出する第２偏向部と、第１偏向部の側から第２偏向部の側へ順に配置された、第１半透過反射面と第２半透過反射面とを備える半透過反射部とを有し、第２半透過反射面は、第１半透過反射面からの光束の一部を第１半透過反射面の側へ反射する。【選択図】図４