Image relaying optical system
AssigneeOlympus Optical Co., Ltd.
InventorsKatsuya Ono, Akira Kikuchi
Life of this patent
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Abstract
An image transmission optical system wherein a lens unit serving for relaying an image for a unit relaying distance consists of two bar shaped cemented lens components, and each of said lens components consists of a bar-shaped lens element and two lens elements which are cemented to both the end surfaces of the bar-shaped lens element respectively of said bar-shaped lens element and have a refractive index higher than that of the bar-shaped lens element. This image transmission optical system comprises a small number of air-contact surfaces and has favorably corrected aberrations.
Claims6
An image relay lens unit comprising two bar-shaped lens components, and a negative lens component having concave surfaces on both the side thereof and arranged between said bar-shaped lens components, each of the surfaces arranged on said two bar-shaped lens components having positive refractive power and located on the side of said negative lens component, and said lens unit being designed so as to satisfy the following conditions (4) and (5):
- (4) -2<.PHI..sub.rB .PHI..sub.2 <-0.1
- (5) 0.5<D.sub.A /D.sub.B <4.0
- wherein the reference symbol .PHI..sub.rB represents refractive power of the pupil side surface of said bar-shaped lens component, the reference symbol .PHI..sub.2 designates refractive power of said lens component having concave surfaces on both the sides thereof, the reference symbol D.sub.A denotes optical path length in terms of glass of said bar-shaped lens component, and the reference symbol D.sub.B represents the distance as measured along the optical axis between said bar-shaped lens component and said lens component having concave surfaces on both the sides thereof.
Dependencies are inferred from the claim text.