JPH04101190U - intrusion alarm device - Google Patents

Abstract

(57) [Summary] [Purpose] Part of the front part of the pyroelectric element part 3 used in the sensor part of the intrusion alarm system is coated with paint to limit the detection area and prevent it from being affected by animals. equipment. [Structure] The Fresnel lens 1 focuses infrared rays emitted by a person when the person approaches. A part of the front surface of the pyroelectric element part 3 is coated with paint or the like to limit the area of incident light and prevent it from sensing dogs and cats. The pyroelectric element section 3 converts the focused infrared light into an electrical signal. The converted signal and the signal from the reference signal section 5 are compared in the discrimination section 4, and if they match, a signal is output from the discrimination section. This output signal is held in the holding section 6, and the buzzer section 7 is continuously driven by this signal to sound an alarm.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an intruder alarm device, and when an intruder approaches the alarm device installed in a window etc. The present invention relates to a device that generates an alarm sound.

0002

[Conventional technology]

Various devices have been devised to detect intruders such as thieves and sound an alarm. . One of these was an alarm device that used a pyroelectric element, but the pyroelectric element Intrusion alarms using such pyroelectric elements operate by sensing the infrared rays emitted by The problem with alarm devices is that they often detect animals and malfunction.

0003

[Problem that the idea aims to solve]

The present invention was devised in view of the above-mentioned problems of the conventional technology. The detection area can be increased by coating a part of the front surface of the pyroelectric element used in the sensor section with paint, etc. The present invention provides a device that has a restricted area and is not affected by animals.

0004

[Means to solve the problem]

In order to solve the above problem, this invention uses a laser that focuses infrared rays emitted by an intruder. the lens, the pyroelectric element that converts the focused infrared light into an electrical signal, and the front of the pyroelectric element A light-shielding part that covers the required area and limits the area of incident light, and a reference signal for identifying people. a reference signal section that outputs a signal, an output signal of the pyroelectric element section, and an output signal of the reference signal section. a discriminating section that compares and outputs a signal, a holding section that holds the output signal of the discriminating section, and a holding section that outputs a signal. a buzzer section that sounds an alarm in response to a signal from the section, the pyroelectric element section, the discrimination section, and the reference signal. The present invention provides an intrusion alarm device that includes a control section that controls the intrusion alarm system.

[0005]

[Effect]

According to the above configuration, the Fresnel lens collects infrared rays emitted by a person when the person approaches. Shine. Part of the front surface of the pyroelectric element is coated with paint, etc. to limit the area of incident light while walking. Avoid detecting dogs and cats. The pyroelectric element turns the focused infrared light into an electrical signal. Convert. The converted signal and the signal from the reference signal section are compared in the discrimination section, and if they match, it is discriminated. The signal is output from the section. This output signal is held in the holding section and the held signal is used to generate a buzzer. - part continues to operate and an alarm sounds.

[0006]

【Example】

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 shows the intrusion detection system of this invention. A block diagram showing one embodiment of the intrusion alarm device, and FIG. 2 is a diagram showing the sensing range of the intrusion alarm device. It is.

[0007] In the figure, 1 is a Fresnel lens that focuses infrared rays emitted by people and animals. Furthermore, the angle of incidence of the infrared rays to be condensed is determined by the focal length of the Fresnel lens, etc. Figure 2 is Indicates that the intruder alarm system is installed in a building, 10 is the building, 11 is the window, and 12 is the intruder. This is the sensor part of the entry warning device. 13 is the sensing range, usually the bottom of the sensing range 15 It has an upper and lower sensing range based on the axis. Although not shown, the surface of the pyroelectric element section 3 Cover the upper half of the pyroelectric element part 3 from the center by applying paint or pasting tape. , the sensing range 13 is narrowed as shown in the figure. When attaching the sensor unit 12 to a building , the height 14 from the ground 16 is about 1 meter. in this way This way, even if an animal such as a dog or cat approaches the sensor unit 12, it will not enter the sensing range 13. Malfunctions caused by animals can be avoided. 5 is a reference signal section, which contains a reference signal for identifying people. Output the number. 4 is the discrimination section, which indicates that the output signal of the pyroelectric element section 3 really detected a human being. Compare the current signal with the reference signal of the reference signal section 5 and output the signal if it is higher than the reference signal. Strengthen. 6 is a holding unit in which the signal from the determining unit 4 is a single signal rather than a continuous signal. In some cases, the signal once input is continuously output. 7 is the buzzer section, The buzzer sounds with the signal from the holding section 6. 8 is a control section, which includes a pyroelectric element section 3, a discrimination section 4 and and controls the reference signal section 5.

[0008] The infrared rays 2 that have passed through the Fresnel lens 1 are converted into electrical signals by the pyroelectric element 3. . The converted signal is subjected to a standard test to determine whether the signal is really the signal when a human is detected in the discriminator 4. When compared with the output signal of the number section 5, if the signal is equal to or higher than the reference signal, the determination section 4 outputs a signal. This signal is held in the holding section 6. The reason for holding it is if a person touches the sensor part for a moment. If it comes out immediately after entering, the detection signal that was sensed will disappear without being used. prevent from doing. The signal once sensed in this way is held and input to the buzzer section 7. The buzzer of the buzzer section 7 is continuously sounded to notify that a person has intruded.

[0009]

[Effect of the idea]

As described above, in this invention, a part of the infrared rays incident on the pyroelectric element can be blocked by coating. Alternatively, animals such as dogs and cats can be prevented from walking by restricting them with simple methods such as pasting tape. Detects only intruders and sounds an alarm. The effect it can have is huge.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an intrusion alarm device of the present invention.

FIG. 2 is a diagram showing the sensing range of the intrusion alarm device of the present invention.

[Explanation of symbols]

1 Fresnel lens 2 Infrared rays 3 Pyroelectric element part 4 Discrimination section 5 Reference signal section 6 Holding part 7 Buzzer section 8 Control section 10 buildings 11 windows 12 Sensor section 13 Sensing range 14 height 15 Bottom of sensing range 16 ground

Claims (1)

[Scope of utility model registration request] Claim 1: A lens that condenses infrared rays emitted by an intruder, a pyroelectric element that converts the condensed infrared rays into an electrical signal, and a pyroelectric element that covers a required portion of the front surface of the pyroelectric element to reduce the area of incident light. A light shielding section for limiting light, a reference signal section for outputting a reference signal for identifying a person, a discrimination section for comparing an output signal of the pyroelectric element section with an output signal of the reference signal section and outputting a signal, and a discrimination section. An intrusion alarm device comprising: a holding part that holds an output signal of the holding part; a buzzer part that sounds an alarm sound based on the signal from the holding part; and a control part that controls the pyroelectric element part, the discrimination part, and the reference signal part.