Patent ID: 9188782
Filing Date: 2015-11-17
Classification: G02B

Abstract:
1. A virtual image display device for recognizing an image light and an external light at the same time, the device comprising: an image element that generates an image light; and a prism that includes three or more non-axisymmetric curved surfaces, and in which an intermediate image is formed as a part of an optical system, wherein, when the external light passes through a first surface and a third surface among a plurality of surfaces that configure the prism to recognize the outside, the visibility is substantially zero, wherein the first surface and the third surface form a concave surface with respect to an observer side, wherein the image light from the image element is totally reflected at the first surface, totally reflected at the third surface, totally reflected again at the first surface and reflected at the second surface, and then transmits through the first surface, and arrives at the observer side, wherein a half mirror is formed on the second surface and the image light is presented to the observer, and wherein a light transmitting member is integrally disposed outside the second surface and the visibility with respect to the external light is substantially zero, and the external light and the image light are presented to the observer overlapping.