Title:
SMOKE DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/210548
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a means for enabling a degree of fouling inside a container of a two-light-reception type smoke detecting device to be determined. A two-light-reception smoke detecting device 1 according to the invention of the present application comprises: a first light emitting unit 11 that emits polarized light; a first light receiving unit 12 having a first light reception axis (arrow C) intersecting a light emission axis (arrow B) of the first light emitting unit 11; a second light receiving unit 13 having a second light reception axis (arrow D) intersecting the light emission axis (arrow B) of the first light emitting unit 11; and a second light emitting unit 14 that emits unpolarized light. The first light receiving unit 12 is disposed on a first electronic circuit board 15, and the second light receiving unit 13 is disposed on a second electronic circuit board 16 perpendicular to the first electronic circuit board 15. Further, the second light emitting unit 14 is disposed on the first electronic circuit board 15. A fouling determination unit (not show) determines a degree of fouling inside a container 17 on the basis of a signal generated by at least one of the first light receiving unit 12 and the second light receiving unit 13 while the second light emitting unit 14 is emitting light.
Inventors:
KUMAKURA YOSHIHIRO (JP)
HOSHINO TOMOHIRO (JP)
ISOGAI KEI (JP)
YAGI SATOMI (JP)
HOSHINO TOMOHIRO (JP)
ISOGAI KEI (JP)
YAGI SATOMI (JP)
Application Number:
PCT/JP2023/016019
Publication Date:
November 02, 2023
Filing Date:
April 21, 2023
Export Citation:
Assignee:
NOHMI BOSAI LTD (JP)
International Classes:
G08B17/107; G01N21/954
Foreign References:
| JP2020181507A | 2020-11-05 | |||
| JPH0757165A | 1995-03-03 | |||
| JPH09269293A | 1997-10-14 |
Attorney, Agent or Firm:
ASAHI PATENT FIRM (JP)
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