DUST SENSOR AND AIR CLEANING MACHINE - MATSUSHITA ELECTRIC WORKS LTD

Title:

DUST SENSOR AND AIR CLEANING MACHINE

Document Type and Number:

Japanese Patent JP2003065940

Kind Code:

A

Abstract:

To provide a dust sensor that can identify dust (allergen) and smoke (cigarette smoke), has a simple constitution, and low in price.

This dust sensor is constituted to detect the quantity of coarse particulates by projecting light upon the particulates from a pulse-driven light source 1 and detecting scattered light synchronized to a generated pulse and to identify the coarse particulates as dust when the difference between the maximum value and mean value of the output of a light receiving element 2 in a fixed period is larger than a prescribed value. This sensor is provided with an identifying means 5 which does not identify the coarse particulates as dust when the mean value in the subsequent fixed period is larger than a set value in the case where the difference between the maximum value and mean value of the output of the element 2 in the fixed period is larger than the prescribed value.

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JPH0650075	[Name of invention] Scattered light smoke detector
JP2016090349	PARTICLE DETECTION SENSOR, DUST SENSOR, SMOKE DETECTOR, AIR PURIFIER, VENTILATOR, AND AIR CONDITIONER

Inventors:

MATSUI YASUNORI
SAINOMOTO YOSHINORI
ARAKI KAZUHIRO
AZUSAWA SHIGEKAZU
OBATA KENJI

Application Number:

JP2001280089A

Publication Date:

March 05, 2003

Filing Date:

September 14, 2001

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC WORKS LTD

International Classes:

G01N21/53; G01N15/06; (IPC1-7): G01N15/06; G01N21/53

Attorney, Agent or Firm:

Keisei Nishikawa (1 person outside)

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