Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1995-05-25
1998-03-31
Nelms, David C.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359633, G02B 2714
Patent
active
057345058
ABSTRACT:
A small-sized, lightweight and inexpensive visual display apparatus which enables observation of a full-color image at a wide field angle, which is clear and flat as far as the edges thereof, without using a costly element such as a polarizing element. The visual display apparatus has an image display device (4), and an ocular optical system for projecting an image formed by the image display device (4) and for leading the projected image to an observer's eyeball. The image display device (4) has a louver (10) for limiting the viewing angle. The ocular optical system has two semitransparent surfaces (2 and 3). The second semitransparent surface (3) is a curved surface which is concave toward the observer's eyeball side, so that light rays emanating from the image display device (4) first pass through the second semitransparent curved surface (3), and are reflected by the first semitransparent surface (2). The reflected light rays are further reflected by the second semitransparent curved surface (3), and then pass through the first semitransparent surface (2) to enter the observer's eyeball. Further, the two semitransparent surfaces (2 and 3) are disposed such that at least the first semitransparent surface (2) is decentered with respect to the observer's visual axis directed to see the center of the projected image.
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Tabata Seiichiro
Togino Takayoshi
Mack Ricky
Nelms David C.
Olympus Optical Co,. Ltd.
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