Optical system for endoscopes

Details Optical system for endoscopes Optical system for endoscopes

1989-01-30

1991-01-29

Arnold, Bruce Y.

G02B 2300

Patent

active

049881728

ABSTRACT:
An optical system for endoscopes is provided with an inhomogeneous lens configured, as a relay lens, so that refractive index reduces progressively in going from a center portion toward a periphery and at least one of an entrance end face and an exit end face satisfies the following condition:

REFERENCES:
patent: 4735491 (1988-04-01), Takahashi

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