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Pyroelectric infrared sensor

A pyroelectric infrared sensor technology, applied in electrical radiation detectors, instruments, scientific instruments, etc., can solve problems such as stress deformation, reduced detector accuracy, false alarms, etc., to reduce temperature stress and reduce impact. , The effect of improving heat dissipation efficiency

Pending Publication Date: 2022-04-08
张蒙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: there is a gap between the printed board and the sensitive element of the existing pyroelectric infrared sensor, so the sensitive element will produce stress deformation under the influence of temperature and pressure, resulting in the accuracy of the detector. Reduced performance, false positives

Method used

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Embodiment approach

[0023] As a specific embodiment of the present invention, the No. 1 pillar 7 is made of heat-conducting plastic, and is fixedly connected to the inner wall of the through hole 6 through the heat sink 72;

[0024] As the working time of the pyroelectric infrared sensor increases, the heat generated by the printed board 5 continues to increase, and the heat absorbed by the heat-conducting silicone oil is also increasing. Among the present invention, the No. 1 pillar 7 is made of heat-conducting plastic, and the heat-conducting plastic It has the characteristics of uniform heat dissipation, which can better dissipate the heat of the heat-conducting silicone oil; the No. 1 pillar 7 and the heat sink 72 are connected to the inner wall of the through hole 6 in a similar suspended connection mode, and the heat-conducting silicone oil cooperates with the heat sink 72 to make the heat Distributed from the through hole 6, the heat dissipated in the through hole 6 is dissipated to the out...

specific Embodiment approach

[0025] As a specific embodiment of the present invention, the bottom of the No. 1 pillar 7 is provided with more than one cooling hole 73, and the cooling hole 73 is sealed with an oil-proof gas-permeable film 74;

[0026] The heat of the heat-conducting silicone oil can not only be dissipated from the casing of the No. 1 pillar 7, but also can be dissipated through the heat dissipation hole 73 provided at the bottom of the No. 1 pillar 7. Since the heat-conducting silicone oil has fluidity, the heat dissipation hole 73 is sealed with an oil-proof breathable film 74 , can not only dissipate heat and ventilate, reduce the temperature of the heat-conducting silicone oil, but also prevent the heat-conducting silicone oil from leaking out; the heat dissipated by the heat-conducting silicone oil through the cooling holes 73 is dissipated to the outside through the cap 1 and the heat-conducting base 2, reducing the temperature of the pyroelectric infrared sensor The internal heat red...

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Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to a pyroelectric infrared sensor which comprises a pipe cap, the pipe cap is matched with a heat conduction base to form a cavity, the upper portion of the heat conduction base is connected with a printed board through pins, and a through hole is formed in the middle of the printed board. A first supporting column, a second supporting column and a sensitive element are sequentially arranged in the vertical direction of the through hole from bottom to top, and the first supporting column and the second supporting column support the sensitive element. A cavity is formed in the first supporting column and filled with heat conduction silicone oil, heat dissipation holes are formed in the bottom of the first supporting column, and the first supporting column is sealed through an oil-proof breathable film. According to the invention, the second pillar is made of memory metal and is in a solid wave shape, when the second pillar absorbs heat, the second pillar deforms and is stretched upwards, the distance between the sensitive element and the printed board and the distance between the sensitive element and the first pillar are increased, and the heat insulation layer between the sensitive element and the second pillar can isolate heat of the second pillar. The influence of heat generated in the sensor on the sensitive element is reduced.

Description

technical field [0001] The invention belongs to the technical field of detection equipment, in particular to a pyroelectric infrared sensor. Background technique [0002] Infrared detector is an energy converter that converts invisible infrared radiation energy into an easy-to-measure voltage signal. It is mainly used to detect human movement, illegal intrusion and alarm. Due to the unique advantages of infrared detection technology, it has been widely researched and applied in military, national defense and civilian fields. The application will be more extensive and the status will be more important. [0003] Pyroelectric infrared sensor is a kind of infrared detector, which has the advantages of not emitting any type of radiation, low device power consumption, good concealment, high sensitivity, small appearance and low price. However, the existing pyroelectric infrared sensor There is a gap between the printed board of the electric infrared sensor and the sensitive elem...

Claims

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Application Information

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IPC IPC(8): G01J5/10G01J5/02
Inventor 张蒙夏磊
Owner 张蒙
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