Photoelectric smoke detector
US8232885B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2009 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Jul 22, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A photoelectric smoke detector is capable of preventing an erroneous alarm from being issued even when steam flows into a smoke detecting unit. The smoke detecting unit includes: an installation section; and a smoke inlet section. The installation section includes: a light emitting element for emitting light to an inside of the installation section; and a light receiving element for receiving the light emitted from the light emitting element. The smoke inlet section includes: a plurality of wall members for preventing external light from entering the smoke inlet section; and a smoke inlet formed between the plurality of wall members. The installation section and the smoke inlet section are arranged so as to overlap each other, with the smoke inlet section being positioned on a lower side of the installation section, and are communicated with each other through an opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.