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Title:
FOCUS POSITION DETECTING DEVICE FOR ENDOSCOPE
Document Type and Number:
Japanese Patent JPS5860718
Kind Code:
A
Abstract:

PURPOSE: To decide the focus in the hard part at the tip of an endoscope and to interlock a focus lens, by detecting the incidence position on a light receiving face of the light, which is emitted from a light source and is reflected from a material to be observed, in the hard part at the tip of the endoscope.

CONSTITUTION: The light which is emitted from a light guide 5 in an endoscope hard part 1 and has a wavelength different from that of the illumination light and has a high directivity is incident to the center of visual fields of materials 8 and 8' to be observed, and the reflected light is focused onto a photodetector array 7 through a filter 9 and a focusing lens 10, and focusing or defocusing is detected on a basis of the position of the incidence. When no force is applied to a wire 13, a driving member 11 is placed in the leftmost position by a spring 12, and a lens 3 is focused to the infinity. When the wire 13 is drawn right, the lens 3 is moved left through the driving member 11 and an interlocking lever 15 and is focused to a near object. Simultaneously, a reflector 6 is turned left, and the photodetector array 7 is turned right, and the focus position is detected.


Inventors:
IMAI TOSHIHIRO
TAIRA AKIO
NAKABASHI KENICHI
IBA YOUICHI
MIHARA SHINICHI
IMAIZUMI MASAKI
Application Number:
JP15972181A
Publication Date:
April 11, 1983
Filing Date:
October 07, 1981
Export Citation:
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Assignee:
OLYMPUS OPTICAL CO
International Classes:
A61B1/00; G02B7/32; G02B23/24; G02B23/26; (IPC1-7): A61B1/00; G02B7/11; G02B23/00; G03B3/00
Attorney, Agent or Firm:
Yasushi Shinohara



 
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