Optical: systems and elements – Lens – Eyepiece
Patent
1995-08-10
1997-12-23
Epps, Georgia Y.
Optical: systems and elements
Lens
Eyepiece
359645, 359716, 359792, G02B 2500, G02B 302, G02B 912
Patent
active
057014752
ABSTRACT:
An eyepiece lens comprising, from front to rear, a first lens unit of positive refractive power having a negative lens and a positive lens, a second lens unit of positive refractive power and a third lens unit of positive refractive power, wherein at least one of the lens surfaces in the first lens unit to the third lens unit is made aspherical, and wherein the apparent field of view covers an angle of about 50 degrees, the eye relief is elongated, and the field curvature is corrected well.
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Canon Kabushiki Kaisha
Epps Georgia Y.
Lester Evelyn A.
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