CN201203922Y - mobile phone used as an alarm - Google Patents

Abstract

The utility model discloses a mobile phone used as an alarm, which comprises: a detection module for detecting a detection area, a signal processing module for processing an electrical signal output by the detection module, and a signal processing module output by the signal processing module. An alarm module for alarming by an alarm signal. The above-mentioned detection module includes a Fresnel lens and an infrared pyroelectric sensor, wherein the Fresnel lens refracts or reflects the pyroelectric infrared signal entering the detection area to the above-mentioned infrared pyroelectric sensor. The pyroelectric sensor converts the pyroelectric infrared signal into an electrical signal, which can perform infrared detection and alarm on moving targets in the detection area. The utility model can enable the mobile phone, a daily article, to have an alarm function by adding hardware devices and modifying the software, the cost is extremely low, and the technical realization is very simple.

Description

mobile phone used as an alarm

technical field

The utility model relates to a portable digital product with an active alarm function, in particular to a mobile phone used as an alarm.

Background technique

Conventional alarm facilities are a set of system devices composed of many devices, which are bulky and have many devices, which are expensive and inconvenient to carry. Even portable and compact security alarm devices are rare and expensive.

Utility model content

The purpose of the embodiment of the utility model is to provide a mobile phone used as an alarm device, which makes the alarm device portable, compact and low-cost through infrared detection and alarm of moving targets in the detection area.

In order to achieve this purpose, the mobile phone used as an alarm in the embodiment of the utility model includes: a detection module for detecting the detection area, a signal processing module for processing the electrical signal output by the detection module, and a signal processing module. An alarm module that outputs an alarm signal to alarm. The detection module includes a Fresnel lens and an infrared pyroelectric sensor. The Fresnel lens refracts or reflects the pyroelectric infrared signal entering the detection area to the infrared pyroelectric sensor. Pyroelectric sensors convert pyro-infrared signals into electrical signals.

Preferably, the infrared pyroelectric sensor includes two pyroelectric elements connected in series or in parallel, and the electric polarization directions of the two pyroelectric elements are opposite.

Preferably, the above-mentioned portable mobile terminal is a mobile phone, and the signal processing module includes: a signal amplifier for amplifying the electrical signal output by the detection module, a digital-to-analog converter for converting the electrical signal into a digital signal, and processing the digital signal and outputting an alarm Mobile phone baseband chip for information.

Preferably, the above-mentioned alarm module is an automatic information transmitter, which automatically transmits alarm information to a predetermined terminal device, or a horn that emits an alarm sound or a motor that emits an alarm vibration, or a camera that takes pictures of the detection area.

Preferably, the above-mentioned signal amplifier is composed of a triode amplifier circuit.

The embodiment of the utility model adopts the method of adding hardware components and modifying the software, so that the mobile phone, a daily article, has an alarm function, is portable, small and exquisite, low in cost, and simple in technology implementation.

Other features and advantages of the present invention will be set forth in the following description, and, in part, will be apparent from the description, or can be learned by practicing the present invention. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the present invention together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 shows the working principle block diagram of the utility model as the mobile phone embodiment of alarm;

Fig. 2 shows the circuit schematic diagram of the signal processing module of the utility model as the mobile phone embodiment of alarm; And

Fig. 3 shows the schematic diagram of the utility model used as the mobile phone embodiment of the alarm.

Detailed ways

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

Fig. 1 shows the working principle block diagram of the mobile phone embodiment of the utility model as alarm. As shown in FIG. 1 , the mobile phone used as an alarm of the present invention includes a detection module 100 , a signal processing module 200 and an alarm module 300 . Wherein, the detection module 100 detects the detection target, the signal processing module 200 processes the electrical signal output by the detection module 100 and outputs an alarm signal, and the alarm module 300 receives the alarm signal and issues an alarm. Wherein, the detection module 100 includes a Fresnel lens 110 and an infrared pyroelectric sensor 120 .

Wherein, the detection module 100 includes a Fresnel lens 110 and an infrared pyroelectric sensor 120 . Fresnel lens (Fresnel lens) 110 is a thin sheet made of polyolefin material. One side of the lens surface is smooth, and the other side is engraved with concentric circles from small to large. Its texture is based on the interference of light. The Fresnel lens 110 has two functions: one is to focus, that is, to refract or reflect the pyroelectric infrared signal on the infrared pyroelectric sensor (PIR); the other is to The detection area is divided into several bright areas and dark areas, so that moving objects entering the detection area can generate changing pyroelectric infrared signals on the infrared pyroelectric sensor (PIR) in the form of temperature changes. Another device is an infrared pyroelectric sensor (PIR) 120, which is composed of ceramic oxide or piezoelectric crystal elements, and electrodes are made on both surfaces of the element. When the temperature within the sensor monitoring range changes by ΔT, the pyroelectric The effect is that a charge ΔQ is generated on the two electrodes, that is, a weak voltage ΔV is generated between the two electrodes. Due to the extremely high output impedance, there is a field effect tube in the infrared pyroelectric sensor (PIR) for impedance transformation.

The infrared pyroelectric sensor (PIR) 120 can convert the change of the infrared signal with a wavelength of 8-12um into an electric signal, and will have an inhibitory effect on the white light signal in nature. The pyroelectric infrared sensor (PIR) 120 usually uses two pyroelectric elements connected in series or parallel, and the two electric polarization directions are just opposite, and the ambient background radiation has almost the same effect on the two pyroelectric elements. , so that the discharge effects cancel each other out, so the detector has no signal output. However, when the heat received by the two pyroelectric elements is different, the pyroelectricity is also different, which cannot be offset, and a signal output is generated.

Fig. 2 shows the circuit principle diagram of the signal processing module 200 of the mobile phone embodiment of the utility model used as an alarm. In the figure, PIR stands for infrared pyroelectric sensor, Vcc1 stands for power supply 1 (positive), Vcc2 stands for power supply 2 (positive), ADC stands for digital-to-analog converter, and GND stands for power supply (ground). As shown in the figure, the signal processing module 200 includes a signal amplifier 210 , a digital-to-analog converter (ADC) 220 and a mobile phone baseband chip 230 . Wherein, the signal amplifier 210 is composed of a triode amplifier circuit 210, the analog signal output by the detection module is converted into a digital signal after being amplified by the signal amplifier 210, and is processed by the mobile phone baseband chip 230 to output alarm information to the alarm module (not shown).

In the present utility model, the alarm module 300 includes an automatic information transmitter (program for automatic information transmission), a camera, a horn and a motor. The information automatic sending program can send the alarm information to the preset number.

Below in conjunction with Fig. 3, the principle of the present utility model is further described.

In nature, any object higher than the absolute temperature (-273°C) will produce an infrared spectrum. Objects with different temperatures have different wavelengths of infrared energy released, so the infrared wavelength is related to the temperature.

The human body has a constant body temperature, generally around 37°C, so the human body emits infrared rays with a specific wavelength of about 10um. The pyroelectric infrared sensor (PIR) works by detecting the infrared rays emitted by the human body at 8-12um. As shown in FIG. 3 , the sensitivity of the pyroelectric infrared sensor (PIR) 120 to the human body is also closely related to the direction of movement of the person. Pyroelectric infrared sensors (PIR) are the least sensitive to radial movement, but most sensitive to X movement in the transverse direction (that is, the direction perpendicular to the radius), so the monitored area is the transverse direction.

When the utility model is applied to a mobile phone, the alarm mobile phone generates an alarm by sensing the temperature difference between a moving object and a background object and post-processing. After opening the anti-theft alarm function through the menu of the mobile phone, the infrared pyroelectric sensor (PIR) 120 of the mobile phone is aimed at the monitoring area. Only the background temperature; once a person enters the detection area, the 8-12um infrared rays radiated by the human body are enhanced by the Fresnel lens 110 and gathered on the pyroelectric infrared sensor (PIR).

When the infrared pyroelectric sensor (PIR) senses the difference signal between the human body temperature and the background temperature, it will lose the charge balance and release the charge outward. The output analog signal is converted into a digital signal after being amplified. After processing by the mobile phone baseband chip, the output information to the alarm module. At this time, the active alarm device can send the preset alarm information, such as telephone recording or short message, to the designated number, or even the 110 command center; if the mobile phone has camera and recording functions, it can also record criminal evidence.

Apparently, the utility model can make the daily necessities of the mobile phone have an alarm function by adding hardware devices and modifying the software, the cost is extremely low, and the technical realization is very simple.

The above are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications, changes and omissions. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. A mobile phone used as an alarm, characterized in that the mobile phone includes: a detection module detecting a detection area, a signal processing module processing an electrical signal output by the detection module, and a signal processing module according to the signal An alarm module for alarming the alarm signal output by the processing module, the detection module includes a Fresnel lens and an infrared pyroelectric sensor, wherein The Fresnel lens refracts or reflects the pyroelectric infrared signal entering the detection area to the infrared pyroelectric sensor, The infrared pyroelectric sensor converts the pyroelectric infrared signal into an electrical signal. 2. The mobile phone used as an alarm according to claim 1, wherein the infrared pyroelectric sensor comprises two pyroelectric elements connected in series or in parallel, and the electric polarization of the two pyroelectric elements is in the opposite direction. 3. the mobile phone as alarm according to claim 1 and 2, is characterized in that, described signal processing module comprises: the signal amplifier that amplifies the electric signal that detection module outputs, described electric signal is converted into digital A digital-to-analog converter for signals, and a mobile phone baseband chip that processes digital signals and outputs alarm information. 4. The mobile phone used as an alarm according to claim 3, wherein the alarm module includes a transmitter for automatically sending the alarm information to a predetermined terminal device. 5 . The mobile phone used as an alarm according to claim 3 , wherein the alarm module includes a horn that emits an alarm sound or a motor that emits an alarm vibration. 6. The mobile phone used as an alarm according to claim 3, characterized in that the mobile phone comprises a camera for taking pictures of the detection area. 7. The mobile phone used as an alarm according to claim 3, wherein the signal amplifier is composed of a triode amplifier circuit.

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