Patent ID: 8446676
Filing Date: 2013-05-21
Classification: G02B

Abstract:
1. A head-mounted display device, comprising: a first casing which incorporates therein at least a display element, and has a light projection window for projecting image light from the display element; a second casing which incorporates therein an eyepiece optical system with a refractive power, and has a light receiving window for receiving the incident image light projected through the light projection window and an eyepiece window for emitting the image light that has passed through the eyepiece optical system; and a coupling portion for coupling the second casing to the first casing so as to make adjustable a length of an optical path between the light projection window and the light receiving window; and wherein the first casing has a guide outside a surface of the first casing; and wherein the coupling portion has a slide member which is provided to the second casing and to be guided along the guide so as to be slidably coupled to the first casing.