Eyepiece system having wide visual field

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

1997-11-07

1999-09-28

Epps, Gerogia

Optical: systems and elements

Lens

Eyepiece

359646, G02B 2500

Patent

active

059597828

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: 5579167 (1996-11-01), Oomura

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