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Fire detector unit

A detector and fire technology, applied in fire alarms, electric fire alarms, instruments, etc., can solve the problem of automatic assembly technology that is not easy to manufacture and assemble detector units

Inactive Publication Date: 2004-12-15
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not easy to assemble the detector unit with low manufacturing cost automatic assembly technology

Method used

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  • Fire detector unit
  • Fire detector unit
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Embodiment Construction

[0034] Figures 1 to 3 A fire detector unit according to a preferred embodiment of the present invention is shown. Figure 4 to Figure 6The base used in the fire detector unit is shown. The fire detector unit is a combination detector for detecting ambient temperature and smoke density in the environment, and it determines the occurrence of fire based on the measured temperature and smoke density. The resulting smoke density is proportional to the amount of scattered light due to the presence of smoke particles. The fire detector unit includes a holder 10 that holds an optical base 20 that accommodates various optical and electronic components, an insect-proof cover 70 and a guard 90 . The base 20 is made of plastic molded into a cylindrical shape with a closed top end and an open bottom end. The insect cover 70 is also made of plastic molded into a cylindrical shape, which also has an open top end and a closed bottom end. The cover member 70 is fitted to the base 20 so as...

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Abstract

An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.

Description

technical field [0001] The invention relates to a fire detector unit, in particular to a scattered light detection type fire detector unit. Background technique [0002] Fire detector units of the scattered light detection type have been widely used to monitor smoke density, which is proportional to the amount of light scattering due to the presence of smoke particles, and the presence of a fire can be determined by comparing the smoke density with a predetermined threshold . Japanese Utility Model Publication No. 4-108293 discloses a typical fire detector unit comprising: a base with a smoke chamber; a light-emitting diode for directing incident light into the smoke chamber; and a photodiode, It collects light scattered by smoke particles in the smoke chamber to generate an electrical signal indicative of the amount of light absorbed. This electrical signal is processed on a fire detection circuit which provides a fire alarm signal when the measured smoke density becomes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/107
CPCG08B29/185G08B17/107G08B17/06G08B17/113G08B29/183
Inventor 西川尚之冈昭一阪本浩司和田刚嗣川野泰幸丰田宪治长沢直也桐畑慎司
Owner MATSUSHITA ELECTRIC WORKS LTD