LIQUID SENSOR

WIPO Patent Application WO/2017/033501

A1

This liquid sensor for detecting whether or not a liquid is present inside a translucent tube (T) comprises: a lighting unit (37) emitting a detection light; a light receiving unit (38) facing the lighting unit (37) and receiving the detection light; and a holding member (70) provided between the lighting unit (37) and the light receiving unit (38), having a pair of elastic pieces (71A, 71B) for sandwiching the tube (T). Each of the elastic pieces (71A, 71B) has a slit (52) extending in a direction intersecting with the length direction of the elastic pieces (71A, 71B) in a different direction from the illumination direction, the slit (52) of each of the elastic pieces (71A, 71B) being disposed on the optical axis of the detection light between the lighting unit (37) and the light receiving unit (38). In addition, light blocking portions (72A, 72B, 73A, 73B) are provided for blocking a portion of the detection light exiting from the lighting unit (37) in a direction intersecting with the length direction of each of the elastic pieces (71A, 71B). The light blocking portions (72A, 72B, 73A, 73B) are provided in such a manner as to block, from among the detection light exiting from the lighting unit (37), light other than the light passing through a region in the tube (T) where the liquid passes.

TERAZAWA TAKUMI (JP)

PCT/JP2016/063607

March 02, 2017

May 02, 2016

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PANASONIC IND DEVICES SUNX CO (JP)

H01H35/00; G01V8/12; G01F23/292

JPH11276576A	1999-10-12
JP2009133747A	2009-06-18
JP2012063328A	2012-03-29
JPH10253425A	1998-09-25
JPH08293234A	1996-11-05

ONDA, Makoto et al. (JP)

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