Endoscope relay lens

Details Endoscope relay lens Endoscope relay lens

1990-04-12

1991-10-22

Arnold, Bruce Y.

Optical: systems and elements

Compound lens system

With relay

359708, G02B 1700, G02B 304

Patent

active

050590090

ABSTRACT:
An endoscope relay lens is disclosed for transmitting an optical image along a narrow cylinder. Relay lenses are typically utilized in pairs to constitute a relay lens set and one or more sets are utilized in medical endoscopes. In the preferred embodiment, the relay lens includes two identical end lenses affixed to opposed ends of a center lens to define a cylinder. The relay lens is symmetrical about a plane bisecting the center of the center lens. The axial length of each end lens is equal to or greater than one-half its diameter. Optimal performance characteristics are achieved when the radii of curvature of the lenses and the axial lengths of the lenses cooperate so that the distance from an object being viewed to the exterior surface of the end lens closest to the object is one-half the distance between relay lenses in a pair and one-half the distance between sets of relay lens pairs. In one embodiment the center lens is spherical.

REFERENCES:
patent: 2828669 (1958-04-01), Peckham
patent: 4148550 (1979-04-01), Macanally
patent: 4148551 (1979-04-01), Macanally
patent: 4158475 (1979-06-01), Dianetti et al.
patent: 4168882 (1979-09-01), Hopkins
patent: 4358810 (1983-05-01), Hamou
patent: 4545652 (1985-10-01), Hoogland
patent: 4575195 (1986-03-01), Hoogland
patent: 4779613 (1988-10-01), Hashiguchi et al.

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