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The HMD optical system composed of 'free form surface prism' (FFS prism) was presented by Canon Inc. at the 1996 SPIE conference. This prism was consists of aspherical surfaces without rotational symmetry. This HMD was suitable for compact HMD and was the 180,000 pixels display which has 34 degrees horizontal FOV and less than 15mm prism thickness. We have developed a new see-through 3D HMD with high resolution, wide field of view (FOV) by improving this FFS prism technique. The new HMD with 51 degrees horizontal FOV and large viewing eyebox shows clear full color image with 920,000 pixels. In spite of the wide FOV, the thickness of this new FFS prism is very thin, 17.9 mm. In this paper, we report this new HMD and 'the AR2 hockey system' as an example of this HMD application.
Yamazaki et al. (Mon,) studied this question.