| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device for an endoscope capable of retaining the quantity of white light emitted from a light guide constant as much as possible even if the quantity of light emitted from a white light source is reduced. SOLUTION: The diameter of the white light emitted from the white light source 201 is reduced by afocal optical system 203 and condensed by a condenser lens 207 to enter the light guide 101. A second lens 203b of the afocal optical system is fixed inside a movable lens-barrel 211 with a screw and a gear formed on the outer surface. The movable lens-barrel 211 is screw-engaged with a fixed lens-barrel 212 with a screw formed on the inner surface. A pinion 214 of a focus adjusting motor 213 is engaged with the gear of the movable lens-barrel. A control part 21 turns on the white light source 202 and drives the focus adjusting motor to regulate the light quantity based on the output of a light quantity sensor 220 which receives a component reflected in a dichroic mirror. COPYRIGHT: (C)2008,JPO&INPIT
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