Ocular optical system and ocular image display apparatus

Details Ocular optical system and ocular image display apparatus Ocular optical system and ocular image display apparatus

1997-12-11

1999-07-20

Mai, Huy

Optical: systems and elements

Lens

Eyepiece

359630, 359715, 359774, G02B 2500, G02B 2714

Patent

active

059263210

ABSTRACT:
An ocular optical system to be placed in front of a human eye forms a magnified virtual image of an original image displayed on a two-dimensional display element. The system has, in order from the eye: a positive first lens group including, in order from the eye, a meniscus first lens which has a concave surface directed toward the eye and a positive meniscus second lens which has a concave surface. A convex surface of the first lens directed toward the second lens and the concave surface of the second lens have the same radius of curvature and are bonded to each other. The system also has a second lens group including an aspherical third lens which has aspherical surfaces on both sides and has a negative on-axis refracting power; a third lens group including an aspherical fourth lens which has aspherical surfaces on both sides and has a positive on-axis refracting power; and a positive fourth lens group including, in order from the eye, a positive biconvex fifth lens and a negative biconcave sixth lens. A convex surface of the fifth lens directed toward the sixth lens and a concave surface of the sixth lens directed toward the fifth lens have the same radius of curvature and are bonded to each other.

REFERENCES:
patent: 3768890 (1973-10-01), Osawa et al.
patent: 5691850 (1997-11-01), Arisaka

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