PRISM OPTICAL SYSTEM, PRISM OPTICAL SYSTEM-INCORPORATED IMAGE DISPLAY APPARATUS, AND PRISM OPTICAL SYSTEM-INCORPORATED IMAGING APPARATUS

摘要

A prism optical system has an optical element that includes,a first surface that defines a transmitting surface as an entrance surface and an internal reflecting surface as well,a second surface that defines an internal reflecting surface in opposition to the first surface,a third surface that defines an internal reflecting surface in opposition to the first surface and adjacent to the second surface,a fourth surface that defines an internal reflecting surface in opposition to the first surface and adjacent to the third surface and an internal reflecting surface closest to the image plane as well, anda fifth surface that defines a transmitting surface adjacent to the first surface and in opposition to the fourth surface;the fourth surface is defined by a rotationally asymmetric surface having a negative power in the Y-Z plane and a positive power in the X-direction perpendicular to the Y-Z plane.