Title:
火災警報器
Document Type and Number:
Japanese Patent JP6858614
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a fire alarm which can prevent entrance of foreign substances to a detection region of a smoke detection unit.SOLUTION: The present invention includes: a smoke detection unit 2 for diffusing light emitted from a light emitting element 11 by smoke particles having entered a detection region 20, detecting the diffused light by a light receiving element 12, and outputting an output signal; an alarm unit 3 capable of issuing a fire alarm; and a control unit 4A for causing the alarm unit 3 to issue a fire alarm when an output value based on an output signal becomes an alarm threshold value or higher, the smoke detection unit 2 having a base material 15 with the detection region 20 in a center part 15A and a plurality of labyrinth walls 17 surrounding the center part 15A, and the labyrinth wall 17 having a lower conductivity than the center part 15A of the base material 15 has.SELECTED DRAWING: Figure 2
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Inventors:
Keisuke Matsumura
Application Number:
JP2017063754A
Publication Date:
April 14, 2021
Filing Date:
March 28, 2017
Export Citation:
Assignee:
OSAKA GAS CO.,LTD.
International Classes:
G08B17/10; G08B17/00; G08B17/107
Domestic Patent References:
| JP56077763U | ||||
| JP2006267128A | ||||
| JP1133693U | ||||
| JP2009110433A | ||||
| JP4259848A |
Attorney, Agent or Firm:
Patent business corporation r&c