Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1998-09-08
2000-01-11
Epps, Georgia
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359631, G02B 2714
Patent
active
060142618
ABSTRACT:
An image display apparatus which enables observation of a clear image at a wide field angle, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be fatigued. The image display apparatus has an image display device (7) and an ocular optical system for projecting the image of the image display device and leading the projected image to an observer's eyeball (1) The ocular optical system has, in the order of backward ray tracing, a first surface (3) which is a refracting surface, a second surface (4) which is a decentered reflecting surface of positive power, a third surface (5) which is a decentered reflecting surface, and a fourth surface (6) which is a refracting surface. At least two of the four surfaces have a finite curvature radius. A space formed by the first to fourth surfaces (3 to 6) is filled with a medium having a refractive index larger than 1. The two reflecting surfaces are disposed such that the principal ray extending from the observer's eyeball (1) to the image display device (7) does not intersect its own path in the ocular optical system. Thus, the first-order image of the image display device (7) is formed on the retina of the observer's eyeball.
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Epps Georgia
Mack Ricky
Olympus Optical Co,. Ltd.
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