Optical: systems and elements – Prism – With reflecting surface
Patent
1997-09-12
1999-11-23
Shafer, Ricky D.
Optical: systems and elements
Prism
With reflecting surface
359631, 359633, 345 8, G02B 504, G02B 2714
Patent
active
059911034
ABSTRACT:
A prism optical system for use as an ocular optical system of a visual display apparatus, which has a compact size as a whole, causes a minimal reduction of the light intensity in the ocular optical system, provides a wide field angle and a large exit pupil diameter, and is effectively corrected for off-axis aberrations. The prism optical system has two transparent surfaces (6 and 7), and two reflecting surfaces (2 and 3). The space between the first transparent surface (6) and the second transparent surface (7) is filled with a medium having a refractive index not smaller than 1.3. Assuming that a light ray which emanates from the center of an image surface (1) and is perpendicularly incident on a pupil position (5) is defined as a chief ray, the two reflecting surfaces (2 and 3) are disposed such that both the reflecting surfaces are tilted with respect to the chief ray, and that the two reflecting surfaces (2and 3) are tilted relative to each other so as to diverge toward the image surface (1) or the pupil position (5) in a plane in which the optical axis bends. At the same time, the two reflecting surfaces (2 and 3) are disposed so that a light ray emanating from the image surface (1) approximately intersects a light ray which emanates from the second transparent surface (7) and enters the pupil position (5).
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Olympus Optical Co,. Ltd.
Shafer Ricky D.
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