| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a head-mounted display capable of measuring a visual range of an observer and adjusting a projection distance of a virtual image at a suitable timing.SOLUTION: A head-mounted display includes: a display optical system (10) that displays a video image; an eyepiece optical system (20) that projects the video image displayed by the display optical system as a virtual image; a ranging unit (30) that measures a visual range to an object facing an observer's eye or to the observer's point of regard; a projection distance adjusting unit (40) that adjusts projection distance of the virtual image projected by the eyepiece optical system on the basis of the visual range measured by the ranging unit; a view fluctuation detecting unit (50) that detects fluctuations in an observer's direction of view; and a control unit (60). If fluctuations in the observer's direction of view are detected by the view fluctuation detecting unit, the control unit transmits a control signal to the ranging unit so as to initiate measurement of the visual range.</p> |
