Objective lens for endoscopes

Details Objective lens for endoscopes Objective lens for endoscopes

1995-10-05

1997-11-25

Nelms, David C.

Optical: systems and elements

Lens

With light limiting or controlling means

359830, 359894, G02B 900, G02B 702, G02B 500

Patent

active

056918534

ABSTRACT:
An objective lens for an endoscope has an optical lens system including a plurality of optical lens elements coaxially arranged at predetermined axial distances, at least an adjacent two of which are spaced at a specified relative axial distance by a thin ring member for restricting light rays entering the optical system.

REFERENCES:
patent: 4015897 (1977-04-01), Konoma et al.
patent: 4902115 (1990-02-01), Takahashi
patent: 5353164 (1994-10-01), Sasian-Alvarado
patent: 5416638 (1995-05-01), Broome

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