| 摘要 |
This invention is directed to provide a head-mounted display device (HMD) which is capable of providing a high-quality and impressive image with an improved S/N ratio through a super-wide-field-angle short-focus lens for obtaining wide-field-angle visual information. An optical device used for the HMD according to the present invention comprise: a reflecting and refracting means is made of copolymerized high-polymer material having positive and negative photoelastic coefficients against an internal stress; a first and second quarter-wave plates have refractive indexes in the direction of their thickness, which values are within the range from the minimal value and a maximal value of refractive indexes of respective quarter-wave plates; the quarter-wave plates are disposed so that their extension axes intersect each other at a right angle; first and second wideband-wave plates, each of which is prepared by bonding a half-wave plate to a quarter-wave plate at a suitable angle, are further provided; and optical elements are covered at their surfaces with anti-reflection coating or bonded to each other with optical adhesive.
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