BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an external view of a HMD of the present invention.
FIG. 2 illustrates a side-cross sectional view of the display unit of the HMD of the present invention.
FIG. 3 illustrates a perspective view of the outer shapes of the eyepiece optical system and a transparent substrate of the HMD of the present invention.
FIG. 4 illustrates a cross sectional view of the connection structure of the eyepiece optical system and the transparent substrate of the HMD of the present invention.
FIG. 5 illustrates a perspective view of another example of the eyepiece optical system of the HMD of the present invention.
FIG. 6 illustrates a perspective view of the outer shapes of the eyepiece optical system and a transparent substrate of a conventional HMD.