| 摘要 |
An image display apparatus which enables observation of a clear image at a wide field angle with substantially no reduction in the brightness of the image, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be fatigued. The apparatus includes an image display device (6) and an ocular optical system (9) for leading an image of the display device (6) to an observer's eyeball (1). The ocular optical system (9) has a first optical element (7) and a second optical element (8). The first optical element (7) has three surfaces, and a space formed by the surfaces is filled with a medium having a refractive index larger than 1. The three surfaces are, in the order of backward ray tracing from the observer's eyeball (1) toward the image display device (6), a first surface (3) serving as both a refracting surface and an internally reflecting surface, a second surface (4) which is a reflecting surface of positive power facing the first surface (3) and decentered or tilted with respect to an observer's visual axis (2), and a third surface (5) which is a refracting surface closest to the image display device (6). The second optical element (8) has refracting action and is disposed between the first surface (3) and the observer's eyeball (1).
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