Eyepiece system having wide visual field

Details Eyepiece system having wide visual field Eyepiece system having wide visual field

1999-01-25

2000-07-25

Dang, Hung Xuan

Optical: systems and elements

Lens

Eyepiece

359644, 359645, 359646, G02B 2500

Patent

active

060943106

ABSTRACT:
An eyepiece system comprising, in order from the object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and configured to locate an intermediate image formed by an objective lens system between the first lens unit and the second lens unit: the first lens unit being a negative lens unit having an object side surface which is convex toward the object side. This eyepiece system has a wide visual field and a long eye relief, and corrects aberrations favorably even at marginal portions of the visual field.

REFERENCES:
patent: 5557464 (1996-09-01), Imaizumi
patent: 5959782 (1999-09-01), Hankawa

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