Smoke detector
The smoke detector uses dual light intensity measurements to rapidly detect smoke by analyzing both individual and group particle reflections, improving detection speed over conventional methods.
JP2026010219APending Publication Date: 2026-01-21NOHMI BOSAI LTD
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Patent Information
- Application Number
- JP2025182603
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2021-03-31
- Filing Date
- 2025-10-29
- Publication Date
- 2026-01-21
AI Technical Summary
Technical Problem
Conventional photoelectric smoke detectors using the total scattered light method or particle counter method require a certain concentration of smoke to reach a threshold before detection, leading to delayed smoke detection.
Method used
A smoke detector that measures the intensity of light reflected by individual particles and groups of particles, using multiple light intensity measuring means and a determination mechanism to quickly detect smoke based on combined measurement values.
Benefits of technology
Enables faster smoke detection by combining measurements of individual particle and group light intensity, allowing for quicker detection compared to conventional methods.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a smoke detector capable of detecting smoke more quickly than a conventional smoke detector.SOLUTION: The smoke detector 11 includes a light emitting unit 111, a light receiving unit 113, a light receiving unit 114, and a control unit 118. The light receiving unit 113 receives scattered light that is emitted from the light emitting unit 111 and scattered by the particles contained in the air in the region A. The light receiving unit 114 receives reflected light that is emitted from the light emitting unit 111 and reflected by a particle passing through the position B. The control unit 118 measures the number of particles that have passed through position B within the most recent period of a predetermined length of time by counting the pulse waves that appear in the change over time of the light intensity signal outputted from the light receiver 114. The control unit 118 determines the presence or absence of smoke in the external space based on the number of particles thus measured and the amplitude of the light intensity signal output from the light receiving part 113.SELECTED DRAWING: Figure 2
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