Optical device and HMD using said optical device

Details Optical device and HMD using said optical device Optical device and HMD using said optical device

1997-04-15

1999-10-12

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

359627, 359629, G02B 2710, G02B 2714

Patent

active

059662425

ABSTRACT:
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.

REFERENCES:
patent: Re27356 (1972-05-01), La Russa
patent: 4093347 (1978-06-01), La Russa
patent: 4785053 (1988-11-01), Ito et al.
patent: 5149771 (1992-09-01), Murata
patent: 5598297 (1997-01-01), Yamanaka et al.

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