Computer graphics processing and selective visual display system – Image superposition by optical means
Patent
1994-11-08
1998-08-11
Liang, Regina
Computer graphics processing and selective visual display system
Image superposition by optical means
359630, G09G 500
Patent
active
057933391
ABSTRACT:
A compact and lightweight visual display apparatus which enables observation of an image that is clear throughout the image field at a field angle of 120.degree. when the user observes with both eyes, and which has a large exit pupil diameter. The visual display apparatus has a two-dimensional image display device (6) for displaying an image for observation, a relay optical system (5) for projecting a real image of the two-dimensional image display device (6) in the air, an ocular magnifier (3) for projecting the real image in the air as an enlarged image and for reflectively bending an optical axis, and a decentered correcting optical system (4) disposed between the relay optical system (5) and the ocular magnifier (3) and having surfaces (41 and 42) decentered with respect to each other. The decentered correcting optical system (4) is arranged such that the vertex (43) of the surface (41) which is closer to the ocular magnifier (3) lies inward of the visual axis (7) after it has been reflected by the ocular magnifier (3), and the ocular magnifier-side surface (41) is an aspherical surface formed from such a curved surface that the refractive power reaches a maximum in the vicinity of the surface vertex (43) and becomes weaker as the distance from the vertex (43) increases toward the outer side. The apparatus may be arranged to correct the diopter by making at least one optical element movable.
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Liang Regina
Olympus Optical Co,. Ltd.
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