Scattered-light smoke detector with a shielding structure of detector circuits
US4897634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1987 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Dec 22, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S174/34
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A scattered-light smoke detector having an improved shield structure. A detector circuit is provided on a printed circuit board which is disposed at an upper portion of a smoke detecting section. The smoke detecting section includes a planar base and a surrounding wall extending downwardly from a lower surface of the base and having an opening or openings which allows or allow smoke to enter therethrough. The surrounding wall defines a smoke detecting space therein. A light emitting element and a photodetector element which are disposed at positions where they are not opposite each other and optical axes thereof intersect each other at a predetermined angle and said photodetector element can receive light from the light emitting element scattered by smoke entering the smoke detecting space. The printed circuit board is attached on an upper surface of the base. A shield layer is interposed between said printed circuit board and said base. Electric and/or electronic parts are formed in chips and packaged on an upper surface of the printed circuit board. A shield case is disposed so that it covers the electric and/or electronic parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.