Title:
炎感知器
Document Type and Number:
Japanese Patent JP7341819
Kind Code:
B2
Abstract:
To provide a flame sensor which prevents flame detection accuracy from being reduced even in the case where a light transmissive protective cover is stained.SOLUTION: In a flame sensor comprising a light guide member 40 including an annular light-emitting part, a plurality of main detection light-receiving elements 50A and 50B each for receiving a predetermined wavelength light emitted by a flame, a light transmissive protective cover 12 and a plurality of test light sources 13A and 13B, and including a function for detecting the flame on the basis of received light quantities of the plurality of main detection light-receiving elements, an incident part 416 of test light is provided in the light-emitting part 410 of the light guide member, and the plurality of test light sources are disposed in such a manner that the emitted test light is transmitted through a portion of the light transmissive protective cover opposed to light-receiving planes of the plurality of main detection light-receiving elements and incident to the incident part. The test light which is incident to the incident part is guided through the light guide member to an emission part 444 and incident to a test light-receiving element 14. A circuit board 30 corrects the received light quantities of the plurality of main detection light-receiving elements on the basis of a received light quantity of the test light-receiving element and detects the flame on the basis of the corrected received light quantities.SELECTED DRAWING: Figure 3
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Inventors:
Atsushi Komachi
Shunsuke Nakajima
Kohei Nishikawa
Yuma Ishida
Shunsuke Nakajima
Kohei Nishikawa
Yuma Ishida
Application Number:
JP2019173650A
Publication Date:
September 11, 2023
Filing Date:
September 25, 2019
Export Citation:
Assignee:
Nittan Co., Ltd.
International Classes:
G08B17/00; G08B17/12
Domestic Patent References:
| JP2010073019A | ||||
| JP2004334715A | ||||
| JP2018147373A | ||||
| JP2019012325A | ||||
| JP2003296848A | ||||
| JP2017162110A |
Foreign References:
| US5914489 |
Attorney, Agent or Firm:
Hiroshi Arafune
Yoshio Arafune
Yoshio Arafune