Illuminating optical system for endoscope

Details Illuminating optical system for endoscope Illuminating optical system for endoscope

2007-08-28

2007-08-28

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With graded refractive index

C600S160000

Reexamination Certificate

active

11362060

ABSTRACT:
An endoscope illuminating optical system having a gradient index lens capable of illuminating by a sufficient light amount and by a wider angle is provided. The endoscope illuminating optical system is constituted to illuminate an observed region by light guided by a light guide1, by way of a gradient index lens2, and the gradient index lens2satisfies Condition Equations (2) and (3) below:in-line-formulae description="In-line Formulae" end="lead"?(AR)2≦0.6  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5k+0.35≦AL/π≦0.5k+0.65  (3)in-line-formulae description="In-line Formulae" end="tail"?where, R designates an effective radius of the gradient index lens, L designates a length in an optical axis X direction of the gradient index lens, A designates a constant coefficient, k designates a nonnegative integer.

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Sato. “Basic Study on Imaging Interferometer using Long Gradient-Index Lenses for Optical Coherence Tomography.” Optical Review.The Optical Society of Japan. vol. 10, No. 5. 2003 pp. 452-455.

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