Title:
内視鏡先端部光学系
Document Type and Number:
Japanese Patent JP4727959
Kind Code:
B2
Abstract:
An optical system for an endoscope can be used by being disposed in the distal end portion of the endoscope, the optical system having a plurality of illumination optical systems, which allow light emitted from a light source to diverge, and an observation optical system, in which at least one of the plurality of illumination optical systems satisfies the following formula (1): 0<=-df(theta)/dtheta<=0.025, 10°<=theta<=85° (1), wherein theta denotes an angle of emission from a center of the illumination optical system, and f(theta) denotes a value obtained by standardizing, at an illuminance at a time when the angle theta of emission is 0°, an illuminance distribution (spherical light distribution characteristics) at a time when a spherical object is illuminated by the illumination optical system.
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Inventors:
Hiroyuki Homma
Application Number:
JP2004256904A
Publication Date:
July 20, 2011
Filing Date:
September 03, 2004
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B23/26; A61B1/00; G02B13/18
Domestic Patent References:
| JP2002182126A | ||||
| JP2002186578A | ||||
| JP4102432A | ||||
| JP2000193894A |
Attorney, Agent or Firm:
Yasushi Shinohara
Masayuki Fujinaka
Masayuki Fujinaka