Eyepieces

Details Eyepieces Eyepieces

1991-10-22

1993-04-13

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

359716, 359784, 359786, 359788, G02B 2500, G02B 1318, G02B 912, G02B 914

Patent

active

052027953

ABSTRACT:
The invention relates to an eyepiece that has an improved image surface flatness even at a wider field angle, is well corrected for various aberrations inclusive chromatic aberration of pupil and is usable with inexpensive microscopes (esp., stereoscopic ones). The eyepiece of the invention is an eyepiece including at least three lens components comprising a cemented lens component consisting positive and negative lens elements and a lens component having a negative refractive power in its entirety, characterized in that the lens component other than the lens components proximate to the object and eye sides is provided with a plastic lens element or elements having at least one aspherical surface.

REFERENCES:
patent: 2394635 (1946-02-01), Reiss
patent: 4094585 (1978-06-01), Betensky

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