Optical: systems and elements – Compound lens system – Right angle inspector
Patent
1997-03-13
1999-06-15
Henry, Jon
Optical: systems and elements
Compound lens system
Right angle inspector
359678, 359708, 359837, 359728, A61B 1055, G02B 302, G02B 1708, G02B 504
Patent
active
059127643
ABSTRACT:
A compact endoscope optical system capable of providing a clear image of minimal distortion even at a wide field angle. The endoscope optical system includes an objective optical system for forming an object image. The objective optical system has a prism member (3) having reflecting surfaces (5, 6) for bending an optical path. The endoscope optical system further includes an image transfer system for leading the object image formed by the objective optical system to an observation apparatus along the direction of a major axis. The objective optical system has a configuration producing decentration aberration by bending the optical path. The prism member (3) has at least one curved surface (4 to 7) having an optical action in the optical path. The curved surface is such a non-rotationally symmetric surface having no axis of rotational symmetry in nor out of the surface as to correct the decentration aberration.
REFERENCES:
patent: 3810221 (1974-05-01), Plummer
patent: 3836931 (1974-09-01), Plummer
patent: 4383761 (1983-05-01), Jones
patent: 5701202 (1997-12-01), Takahashi
Henry Jon
Olympus Optical Co,. Ltd.
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