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Photoelectric smoke detector

A smoke detector, photoelectric technology, applied in the direction of instruments, alarms, fire alarms, etc., can solve the problems that stray light cannot be removed, assembly workers increase, etc., to achieve the effect of reducing man-hours, reducing the number of parts, and easy manufacturing

Active Publication Date: 2014-05-07
NOHMI BOSAI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Conventional photoelectric smoke detectors have the problem of not being able to remove a certain amount of stray light because they only have one hole.
[0008] In addition, when assembling the optical system of the conventional photoelectric smoke detector, as mentioned above, since it is necessary to separately assemble the processing PD and the shield box, the assembly man-hours inevitably increase.

Method used

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  • Photoelectric smoke detector
  • Photoelectric smoke detector
  • Photoelectric smoke detector

Examples

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Embodiment Construction

[0030] figure 1 (a) and (b) are the appearance diagram of the photoelectric smoke detector according to one embodiment of the present invention and its b-b sectional view. figure 2 with image 3 yes figure 1 An exploded perspective view of a photoelectric smoke detector. figure 2 is a perspective view when viewed from above, image 3 It is a perspective view when viewed from below. In addition, in figure 1 In (b), some internal parts are omitted.

[0031] The photoelectric smoke detector includes: a main body 1 equipped with electronic components for detecting fire and driving an alarm speaker (details are not shown); a cover (protective cover) 2 covering the main body 1; Ending at the back of the main body 1, there are screw holes for installation to the ceiling, etc., and a dark box 4 is accommodated between the main body 1 and the cover 2, and the dark box 4 is equipped with parts that function as a smoke detector (details will be described later). The cover 2 has ...

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PUM

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Abstract

The present invention provides a photoelectric smoke detector, which is capable of removing certain stray light. The detector has a black box (4) provided with a luminous element containing section (45) for containing LED (60) as luminous element; and holes arranged in front of the luminous element containing section (45); the holes include a plurality of holes (61, 62) having different distances to the LED (60), and opening sizes of the holes in width direction increase proportionally to increase of the distances to the LED (60).

Description

[0001] This application is a divisional application of a patent application with an application date of January 22, 2009, an invention name of "photoelectric smoke detector", and an application number of "200910006005.4". technical field [0002] The invention relates to a photoelectric smoke detector, in particular to the structure of the hole arranged in front of the light-emitting element. [0003] In addition, the present invention relates to a photoelectric smoke detector, and particularly relates to the structure of a shield box for accommodating a light receiving element. Background technique [0004] In the photoelectric smoke detector, there is a light-emitting element storage part in the dark box, which is used to store light-emitting diodes (hereinafter also referred to as LEDs) as light-emitting elements. The direction of travel of the light emitted by the LED. [0005] In addition, in the photoelectric smoke detector, the photosensitive diode (hereinafter refer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/107
CPCG08B17/103G08B17/113
Inventor 冈田昭雄
Owner NOHMI BOSAI LTD