초록 ▼

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 imag

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).

대표청구항 ▼

[ What I claim is:] [20.]20. An imaging optical system for forming an object image as an image plane,said imaging optical system comprising:an optical unit disposed between a pupil and said image plane,said optical unit including a first optical element and a second optical element,said first optica

[ What I claim is:] [20.]20. An imaging optical system for forming an object image as an image plane,said imaging optical system comprising:an optical unit disposed between a pupil and said image plane,said optical unit including a first optical element and a second optical element,said first optical element having at least three surfaces,wherein a space formed by said at least three surfaces is filled with a medium having a refractive index larger than 1,said at least three surfaces being, in order in which light rays pass according to ray tracing from said pupil toward said image plane, a first surface which serves as both a refracting surface and an internally reflecting surface, a second surface which is a reflecting surface of positive power facing said first surface and which is one of decentered and tilted with respect to an optical axis, and a third surface which is a refracting surface closest to said image plane,said second optical element having refracting action and being disposed between said first surface and said pupil..Iaddend..Iadd.