| 摘要 |
PROBLEM TO BE SOLVED: To obtain a head mounted display device equipped with a compact enlarging optical system capable of compensating the most off-axis distortion aberration to about 5% in spite of such a wide viewing angle that a horizontal viewing angle is >=30 deg.. SOLUTION: This head mounted display device includes a display element D displaying the contents of information and an optical system enlarging and projecting the displayed contents as a virtual image to an eyeball without forming them into an image in an optical path. In the device, the optical system is provided with at least a prism member P, and the member P is constituted to include an incident surface arranged on the element D side, a reflection surface R whose concave surface faces to a prism medium side and which gives power to luminous flux, and a transmission and reflection surface used both for the transmitting action and the reflecting action of the luminous flux and arranged at a position where the optical path is folded back in order to realize compaction between the surface R and this surface. The incident surface of the member P is constituted of an aspherical surface. |
