Optical: systems and elements – Lens – Eyepiece
Reexamination Certificate
2009-04-07
2010-12-21
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
Eyepiece
C359S726000, C359S737000, C396S384000, C396S386000
Reexamination Certificate
active
07855837
ABSTRACT:
The invention provides a viewing optical system comprising:a screen on which an object image by a taking lens is formed,an image erection optical system for erecting the object image formed on the screen, andan eyepiece lens system of positive refracting power for guiding a light beam leaving the image erection optical system to the eyeball of a viewer, wherein:the image erection optical system comprises a plurality of reflecting surfaces,the eyepiece optical system comprises, in order from a screen side to an exit pupil side,a first lens element of negative refracting power,a second lens element convex on both the screen side and the exit pupil side, anda third lens element that is of negative refracting power and has a meniscus shape concave on the exit pupil side, andthe third lens element satisfies the following condition (1):in-line-formulae description="In-line Formulae" end="lead"?0.13<DL3/fe<0.30 (1)in-line-formulae description="In-line Formulae" end="tail"?where DL3 is the axial thickness of the third lens, andfe is the focal length of the eyepiece lens system provided that when the eyepiece lens system has a diopter adjustable by movement of the lenses, fe is going to be a focal length at −1 diopter.
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Collins Darryl J
Kenyon & Kenyon LLP
Olympus Imaging Corp.
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