| 摘要 |
A compact and lightweight visual display apparatus having high resolution and a large exit pupil diameter, which enables observation of an image that is flat and clear as far as the edges of the visual field at a wide viewing angle of 30 DEG or more using a planar two-dimensional image display device. The apparatus uses a concentric optical system which provides a flat image surface (4) as an ocular optical system. The concentric optical system has at least two semitransparent reflecting surfaces (2 and 3) which have respective centers of curvature disposed in the vicinity of a pupil (1) and which have respective concave surfaces directed toward the pupil. The semitransparent reflecting surfaces are disposed so that each semitransparent reflecting surface transmits light rays at least once and reflects them at least once.
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