CN110853299B

CN110853299B - Detection and alarm device for preventing children from falling off and leaving bed

Info

Publication number: CN110853299B
Application number: CN201911191134.5A
Authority: CN
Inventors: 周天沛
Original assignee: Xuzhou College of Industrial Technology
Current assignee: Xuzhou College of Industrial Technology
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-06-12
Anticipated expiration: 2039-11-28
Also published as: CN110853299A

Abstract

A children prevent falling the bed and leave the bed and detect the alarm device, set up the bed fence (1) in one side of the bed, still include installing the photoelectric emission tube LED1(2) on one side of head of a bed, install the photoelectric receiving tube V1(3) on the other side of head of a bed, the photoelectric receiving tube V1 is used for receiving the transmitting signal of the photoelectric emission tube LED1, install the wireless transmitter (4) on the other side of head of a bed, the wireless receiver corresponding to wireless transmitter is installed on children, install the infrared sensor IRX (5) under the bed, still include with the photoelectric emission tube LED1, the photoelectric receiving tube V1, the wireless transmitter, peripheral circuit that the infrared sensor IRX is connected; the invention can monitor the sleeping state of the child at any time, and can give an alarm when the child falls off the bed or leaves the bed carelessly, thereby being convenient for a teacher to handle.

Description

Detection and alarm device for preventing children from falling off and leaving bed

Technical Field

The invention relates to a bed falling prevention and bed leaving alarm device, in particular to a child bed falling prevention and bed leaving detection alarm device, and belongs to the technical field of child sleeping safety.

Background

At present, many kindergartens have children to take lunch break, and in some rural areas in remote areas, some elementary school students in small schools need to live in schools. Unlike adults, children are easy to fall off the bed when sleeping due to the fact that the children are younger in age and poor in self-control capability, and meanwhile, some children are relatively naughty and do not sleep well, like to steal and leave the bed of the children, so that potential safety hazards exist.

The number of the child management teachers in the kindergarten or the small school is not enough, and the child management teachers need to have a rest, so that the sleeping conditions of all children cannot be taken care of.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a detection and alarm device for preventing a child from falling off a bed and getting out of the bed, which can monitor the sleeping state of the child at any time, and can give an alarm when the child falls off the bed or gets out of the bed carelessly, so that a teacher can conveniently handle the alarm.

In order to achieve the purpose, the invention provides a detection and alarm device for preventing children from falling off and getting out of a bed, wherein a bed fence is arranged on one side of the bed, the detection and alarm device further comprises a photoelectric emission tube LED1 arranged on one side of a bed head, a photoelectric receiving tube V1 arranged on the other side of the bed head, a photoelectric receiving tube V1 used for receiving a transmission signal of the photoelectric emission tube LED1, a wireless transmitter arranged on the other side of the bed head, a wireless receiver corresponding to the wireless transmitter arranged on a child body, and an infrared sensor IRX arranged under the bed, and further comprises a peripheral circuit connected with the photoelectric emission tube LED1, the photoelectric receiving tube V1, the wireless transmitter and the infrared sensor IRX; the peripheral circuit comprises resistors R1-R14, a potentiometer RP1, an electrolytic capacitor C1, an electrolytic capacitor C7, electrolytic capacitors C9-C10, capacitors C2-C6, a capacitor C8, a variable capacitor Ct1, diodes D1-D3, light emitting diodes LED 2-LED 3, triodes BG 1-BG 5, a six-inverter IC1, a dual-voltage comparator integrated circuit IC2, a power switch K1, a power supply E1, a relay J1, a normally open contact J1-1 of a relay J1, a relay J2, a normally open contact J2-1 of a relay J1, a speaker SW and inductance coils L1-L2,

the wireless receiver circuit comprises resistors R15-R25, an electrolytic capacitor C11, capacitors C12-C16, an electrolytic capacitor C17, capacitors C18-C20, a variable capacitor Ct2, diodes D5-D8, light emitting diodes LED 4-LED 5, a triode BG6, a six-inverter IC3, a power switch K2, a power supply E2 and inductance coils L3-L4;

one end of a power supply E1 is connected in series with a power switch K1 and then respectively connected with the anode of an electrolytic capacitor C1, one end of a resistor R5, one end of a resistor R7, a first fixed end of a potentiometer RP1, one end of a resistor R8, one end of a resistor R9, an 8 pin of a dual-voltage comparator integrated circuit IC2, the cathode of a diode D2, one end of a relay J2, a 14 pin of a six-inverter IC1, one end of a normally-open contact J1-1 of the relay J1, one end of a capacitor C3, one end of a capacitor C5 and an interface 1 of an inductance coil L5, a 1 pin of the six-inverter IC 5 is connected with one end of the resistor R5, a2 pin of the six-inverter IC 5 and a 3 pin of the six-inverter IC 5 are connected in parallel and then connected with one end of the resistor R5, a 4 pin of the six-inverter IC 5 and a 5 pin of the other end of the six-inverter IC 5 are connected in parallel and then connected with one end of the capacitor; a pin 6 of a six-inverter IC1 is connected with the anode of a diode D3, the cathode of the diode D3 is connected with the base of a triode BG1 and one end of a capacitor C6 after being connected with a resistor R3 in series, the collector of the triode BG1 is connected with one end of a capacitor C4, one end of a variable capacitor Ct1 and an interface 1 of an inductor L2, an interface 2 of the inductor L1 is connected with an interface 3 of an inductor L2, the other end of the capacitor C6 is connected with the other end of a variable capacitor Ct1 and an interface 2 of an inductor L2, the emitter of the triode BG1 is connected with the other end of a capacitor C4, one end of a resistor R68642 and the other end of a capacitor C5928, the other end of a power supply E9, the cathode of an electrolytic capacitor C1, a pin 7 of a six-inverter IC1, the other end of a resistor R4;

the other end of a normally open contact J1-1 of a relay J1 is connected with one end of a resistor R11, one end of a resistor R12, one end of a resistor R13, one end of a resistor R14 and one end of a loudspeaker SW after being connected with a normally open contact J2-1 of a relay J2 in series, the other end of the resistor R5 is connected with the 2 pin of an infrared sensor IRX and the positive electrode of an electrolytic capacitor C7, the 3 pin of the infrared sensor IRX is connected with the base of a triode BG2 after being connected with a resistor R6 in series, the emitter of the triode BG2 is connected with the other end of a resistor R7, the collector of the triode BG2 is connected with the negative electrode of a diode D1 and one end of a relay J1, the sliding end of a potentiometer RP1 is connected with the 2 pin of a double-voltage comparator integrated circuit IC2, the other end of the resistor R8 is connected with one end of a photoelectric emission tube LED1, the 3 pin of a double-voltage comparator integrated IC 82, One end of a capacitor C8, a base of a photoelectric receiving tube V1 is used for receiving signals of a photoelectric emitting tube LED1, a pin 1 of a double-voltage comparator integrated circuit IC2 is connected with a base of a triode BG3 after being connected with a resistor R10 in series, a collector of the triode BG3 is connected with an anode of a diode D2 and the other end of a relay J2 respectively, the other end of the resistor R11 is connected with a base of a triode BG4 and a cathode of an electrolytic capacitor C10 respectively, a collector of the triode BG4 is connected with a cathode of a light emitting diode LED2 and an anode of an electrolytic capacitor C9 respectively, an anode of the light emitting diode LED2 is connected with the other end of a resistor R12, a cathode of an electrolytic capacitor C9 is connected with a base of a triode BG5 and the other end of a resistor R13 respectively, a collector of the triode BG5 is connected with a cathode of a light emitting diode LED3, an anode of an electrolytic capacitor C10 and the other end of a speaker SW 3, an anode of a resistor R, The cathode of an electrolytic capacitor C7, the anode of a diode D1, the other end of a relay J1, the second fixed end of a potentiometer RP1, the other end of a photoelectric emission tube LED1, the emitter of a photoelectric receiving tube V1, the other end of a capacitor C8, the pin 4 of a dual-voltage comparator integrated circuit IC2, the emitter of a triode BG3, the emitter of a triode BG4 and the emitter of a triode BG5 are all grounded;

one end of a power supply E2 of the wireless receiver circuit is connected with a power switch K2 in series and then is connected with the anode of an electrolytic capacitor C11, the 14 pin of a six-inverter IC3, one end of a resistor R18 and one end of a resistor R17 respectively, the 1 pin of the six-inverter IC3 is connected with the anode of a diode D8 and one end of a resistor R24 respectively, the cathode of a diode D8 is connected with the 8 pin of a six-inverter IC3, the 2 pin of the six-inverter IC3 and the 3 pin of the six-inverter IC3 are connected in parallel and then are connected with one end of a resistor R25, the 4 pin of the six-inverter IC3 and the 5 pin of the six-inverter IC3 are connected in parallel and then are connected with one end of a capacitor C20, and the other end of a resistor R24; the pin 6 of the six-inverter IC3 is connected to the anode of the LED4 and the anode of the LED5, the pin 9 of the six-inverter IC3 is connected to one end of the resistor R23, one end of the capacitor C19 and the cathode of the diode D7, the anode of the diode D7 is connected to the cathode of the diode D6 and one end of the capacitor C18, the pin 10 of the six-inverter IC3 is connected to one end of the resistor R22 and the other end of the capacitor C18, the pin 11 of the six-inverter IC 18 is connected in series with the resistor R18 and then connected to the other end of the resistor R18, the pin 12 of the six-inverter IC 18 and one end of the resistor R18, the pin 13 of the six-inverter IC 18 is connected to the other end of the resistor R18 and the cathode of the electrolytic capacitor C18, the anode of the electrolytic capacitor C18 is connected to one end of the resistor R18 and one end of the capacitor C18, the other end of the resistor R18 and the capacitor Ct 18, the other end of the inductor L4 and the other end of the variable capacitor Ct2 are connected and then respectively connected with one end of a capacitor C13 and a collector of a triode BG6, the other end of a resistor R17 is respectively connected with the other end of a capacitor C15, one end of a capacitor C14, a base of the triode BG6 and one end of a resistor R16, the other end of a resistor R16 is connected with the anode of a diode D5, the other end of the capacitor C13 and an emitter of the triode BG6 are connected and then connected with an interface 1 of an inductor L3, an interface 2 of the inductor L3 is respectively connected with one end of a capacitor C12 and one end of a resistor R15, the other end of the power supply E2, the cathode of the electrolytic capacitor C11, the cathode of the light emitting diode LED4, the cathode of the light emitting diode LED5, the pin 7 of the six-inverter IC3, the other end of the capacitor C19, the anode of the diode D6, the other end of the resistor R23, the other end of the capacitor C14, the cathode of the diode D5, the other end of the capacitor C12, and the other end of the resistor R15 are grounded.

As a further improvement of the invention, the six-inverter IC1 and the six-inverter IC3 are of the type TC4069, and the dual-voltage comparator integrated circuit IC2 is of the type LM 393.

As a further improvement of the invention, the transistor BG1 and the transistor BG6 are NPN tube type, model 2SC4034S, the transistor BG2 is PNP tube type, model 9012, and the transistors BG3, BG4 and BG5 are NPN tube type, model 9013.

As a further improvement of the invention, the diodes D1-D8 are 1N 4148.

As a further improvement of the invention, the relays J1 and J2 are direct current relays with the models of JRX-20F.

As a further improvement of the present invention, the variable capacitances Ct1 and Ct2 are ceramic semi-variable capacitances.

As a further improvement of the present invention, photoemissive tube LED1 is model IR 204C-A.

As a further improvement of the invention, the light emitting diodes LED 2-LED 5 are ordinary red light emitting diodes.

As a further improvement of the invention, the infrared sensor IRX is of the type HS0038A 2.

As a further improvement of the invention, the model of the photoelectric receiving tube V1 is PD 204-6B.

As a further improvement of the invention, the alternating current contactors KM1 and KM2 are of model number CJX4011, the water outlet valves SV1 and SV2, the water inlet valve SV3 and the water outlet valve SV4 are of model number DCF-T-20.

Compared with the prior art, the invention arranges the bed fence at one side of the bed to prevent children from falling off from the bed fence side of the bed, the photoelectric emission tube LED1 is arranged at one side of the bed head, the photoelectric receiving tube V1 is arranged at the other side of the bed head, the photoelectric receiving tube V1 is used for receiving the emission signal of the photoelectric emission tube LED1, the wireless transmitter is arranged at the other side of the bed head, the wireless receiver corresponding to the wireless transmitter is arranged on the body of the children, the infrared sensor IRX is arranged under the bed, the invention also comprises a peripheral circuit and a wireless receiver circuit which are connected with the photoelectric emission tube LED1, the photoelectric receiving tube V1, the wireless transmitter and the infrared sensor IRX, and by the scheme, when the rest time is up, a host tube teacher presses down the power switch K1, each device starts to work, if the children fall off the bed carelessly, the photoelectric sensor consisting of the photoelectric emission tube LED1 and the photoelectric receiving tube V1 can detect the children falling off the infrared sensor IRX can also detect the children falling off the, at the moment, the alarm lamp arranged at the teacher twinkles, and the loudspeaker SW can make a sound to remind the teacher to check; if some children steal to get out of the bed, the photoelectric sensor consisting of the photoelectric emitting tube LED1 and the photoelectric receiving tube V1 can detect that the children run out of the bed for a certain distance, the alarm lamp arranged at the teacher can flash, the loudspeaker SW can make a sound to remind the teacher to check, and meanwhile, the lamp arranged on the children can flash, so that the teacher can conveniently find the children; the invention has the advantages that when the child falls off the bed or leaves the bed, the alarm can be given out quickly, and the treatment by a teacher is facilitated.

Drawings

FIG. 1 is a schematic view of an installation configuration of the present invention;

FIG. 2 is a schematic diagram of the peripheral circuitry of the present invention;

fig. 3 is a circuit schematic of the wireless receiver of the present invention.

In the figure: 1. bed fence, 2, photoelectric emission tube LED1, 3, photoelectric receiving tube, 4, wireless transmitter, 5, infrared sensor IRX.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1, a detection alarm device for preventing children from falling and leaving a bed, wherein a bed fence 1 is arranged on one side of the bed, the detection alarm device further comprises a photoelectric emission tube LED1 arranged on one side of a bed head, a photoelectric receiving tube V1 arranged on the other side of the bed head, a photoelectric receiving tube V1 used for receiving emission signals of the photoelectric emission tube LED1, a wireless transmitter 4 arranged on the other side of the bed head, a wireless receiver corresponding to the wireless transmitter 4 arranged on a child body, and an infrared sensor IRX arranged under the bed, and further comprises a peripheral circuit connected with the photoelectric emission tube LED1, the photoelectric receiving tube V1, the wireless transmitter and the infrared sensor IRX; the peripheral circuit comprises resistors R1-R14, a potentiometer RP1, an electrolytic capacitor C1, an electrolytic capacitor C7, electrolytic capacitors C9-C10, capacitors C2-C6, a capacitor C8, a variable capacitor Ct1, diodes D1-D3, light emitting diodes LED 2-LED 3, triodes BG 1-BG 5, a six-inverter IC1, a dual-voltage comparator integrated circuit IC2, a power switch K1, a power supply E1, a relay J1, a normally open contact J1-1 of a relay J1, a relay J2, a normally open contact J2-1 of a relay J1, a speaker SW and inductance coils L1-L2,

the wireless receiver circuit comprises resistors R15-R25, an electrolytic capacitor C11, capacitors C12-C16, an electrolytic capacitor C17, capacitors C18-C20, a variable capacitor Ct2, diodes D5-D8, light emitting diodes LED 4-LED 5, a triode BG6, a six-inverter IC3, a power switch K2, a power supply E2 and inductance coils L3-L4; the model of the six-inverter IC1 and the model of the six-inverter IC3 are TC4069, the model of the dual-voltage comparator integrated circuit IC2 is LM393, the model of the triode BG1 and the model of the triode BG6 are NPN tube types, the model of the triode BG 634 is 2SC 403S, the model of the triode BG2 is PNP tube type, the model of the triode BG 9012, the model of the triode BG3, the model of the BG4 and the model of the triode BG5 are NPN tube types, the model of the triode 9013, the model of the diodes D1-D8 is 1N4148, the models of the relays J1 and J2 are direct current relays, the models of JRX-20F, the variable capacitors Ct1 and Ct2 are ceramic semi-variable capacitors, the model of the photoemissive tube LED1 is IR 204-A, the models of the light emitting diodes LED 2-LED 5 are common red light emitting diodes, the model of the infrared sensor IRX is HS 0038A.

The resistances of these elements in fig. 2 and 3 are conventional, and those skilled in the art can adjust the parameters of the respective elements as required.

The working principle is as follows:

when the rest time of the lunch or night comes, the supervising teacher switches on the power switch K1 and simultaneously switches on the power switch K2 installed on the body of the child, when the child normally sleeps, infrared light emitted by the photoelectric emission tube LED1 installed at the bed head can be received by the photoelectric receiving tube V1, the 3 pin of the dual-voltage comparator integrated circuit IC2 is at a low level which is less than the 2 pin voltage of the dual-voltage comparator integrated circuit IC2, the 1 pin of the dual-voltage comparator integrated circuit IC2 outputs a low level, the triode BG3 is cut off, the relay J2 is de-energized, and the normally open contact J2-1 of the relay J2 is not attracted;

if the child falls off the bed carelessly, the child will certainly block infrared light (one side is provided with a bed fence) emitted by the photoelectric emission tube LED1, so that the photoelectric receiving tube V1 cannot receive signals, the pin 3 of the double-voltage comparator integrated circuit IC2 is at a high level which is greater than the pin 2 voltage of the double-voltage comparator integrated circuit IC2, the pin 1 of the double-voltage comparator integrated circuit IC2 outputs a high level, the triode BG3 is conducted, the relay J2 is electrified and sucked, the normally open contact J2-1 of the relay J2 is closed, meanwhile, after the child falls off the bed, the infrared sensor IRX arranged under the bed can detect signals, 3 pins of the infrared sensor IRX output low levels, the triode BG2 is conducted, the relay J1 is electrified and pulled, the normally open contact J1-1 of the relay J1 is closed, and at the moment, the triode BG4, the triode BG5, the resistors R11-R14, the electrolytic capacitor C9 and the electrolytic capacitor C10 of the peripheral circuit form a flicker alarm circuit; if the transistor BG4 is firstly conducted, the collector voltage of the transistor BG4 is reduced, the light emitting diode LED2 is lighted, the positive electrode of the electrolytic capacitor C9 is close to zero voltage, and the voltage at the two ends of the capacitor cannot be suddenly changed, so the base electrode of the transistor BG5 is also pulled to be close to zero voltage, the transistor BG5 is cut off, the light emitting diode LED3 is not lighted, and the loudspeaker SW does not sound; when the voltage of the base of the transistor BG5 is gradually increased by charging the electrolytic capacitor C9 by the power supply through the resistor R13, the transistor BG5 is changed from a cut-off state to a conducting state when the voltage of the collector of the transistor BG5 is reduced, the light emitting diode LED3 is lighted, the speaker SW does not sound, meanwhile, the voltage of the collector of the transistor BG5 is reduced to reduce the voltage of the base of the transistor BG4 through the action of the electrolytic capacitor C10, the transistor BG4 is changed from a conducting state to a cut-off state, the light emitting diode LED2 is extinguished, the transistor BG4 and the transistor BG5 in the circuit are alternately conducted and cut-off, the light emitting diode LED2 and the light emitting diode LED3 do not continuously emit light circularly, the speaker SW also emits a loud alarm sound of 'tic-tic', the capacity of the electrolytic capacitor C9 and the electrolytic capacitor C10 is changed to change the speed of lighting of the light emitting diode LED2 and the light emitting diode LED3 circularly, and reminding the teacher to check.

If children steal and leave the bed instead of falling the bed and play, the infrared light sent by the photoelectric transmitting tube LED1 can be blocked, so that the photoelectric receiving tube V1 cannot receive signals, 3 pins of the double-voltage comparator integrated circuit IC2 are high levels and are larger than 2 pin voltages of the double-voltage comparator integrated circuit IC2, 1 pin of the double-voltage comparator integrated circuit IC2 outputs the high levels, the triode BG3 is conducted, the relay J2 is electrified and attracted, the normally open contact J2-1 of the relay J2 is closed, the infrared sensor IRX arranged under the bed can also detect the signals, the relay J1 is electrified and attracted, and the normally open contact J1-1 of the relay J1 is closed. The alarm lamp also mounted at the teacher will flash, and the speaker SW will sound a loud beep-beep alarm to remind the teacher to look over,

a triode BG1 in a wireless transmitter circuit installed at a bed head and surrounding elements form a Colpitts LC oscillating circuit, carrier waves with certain frequency can be generated and transmitted out through an inductance coil L1 and an inductance coil L2, a variable capacitor Ct1 is a ceramic semi-variable capacitor and can adjust the oscillating frequency, the triode BG6 in a wireless receiver installed on a child body and the surrounding elements form a super-regenerative demodulation circuit, the inductance coil L4 and the variable capacitor Ct2 are tuning elements, signals transmitted by a wireless transmitter can be received by adjusting the variable capacitor Ct2, the transmitting frequency and the receiving frequency can be adjusted by adjusting the variable capacitors Ct1 and Ct2, the frequency of each bed is guaranteed to be different, and mutual interference cannot occur. Legs 12 and 13 of the six-inverter IC3,

legs

10 and 11 of the six-inverter IC3 are two inverters, which form a linear amplifier, and can amplify (about 3V) the detected output (about 100V), and then perform peak detection through diodes D6 and D7, wherein when a transmitting signal is received, leg 9 of the six-inverter IC3 is high, leg 8 of the six-inverter IC3 is low, and when the receiver does not receive the transmitting signal, leg 9 of the six-inverter IC3 is low, leg 8 of the six-inverter IC3 is high,

when the teacher discovers that the alarm lamp flickers, the speaker SW alarms, the teacher can check the alarm lamp, if the child is found not to fall off the bed and not on the bed, the power supply of the wireless transmitter can be turned off, the wireless receiver arranged on the body of the child cannot receive signals, the light emitting diode LED4 and the light emitting diode LED5 flickers, and the teacher can conveniently find the child who plays without sleeping.

Claims

1. A children prevent falling the bed and leave the bed and detect the alarm device, set up the bed fence (1) in one side of the bed, characterized by, still include installing the photoelectric emission tube LED1(2) on one side of head of a bed, install the photoelectric receiving tube V1(3) on the other side of head of a bed, the photoelectric receiving tube V1(3) is used for receiving the transmission signal of the photoelectric emission tube LED1(2), install the wireless transmitter (4) on the other side of head of a bed, the wireless receiver corresponding to wireless transmitter (4) is installed on children, install the infrared sensor IRX (5) under the bed, still include the peripheral circuit connected with photoelectric emission tube LED1(2), the photoelectric receiving tube V1(3), the wireless transmitter (4), the infrared sensor IRX (5); the peripheral circuit comprises resistors R1-R14, a potentiometer RP1, an electrolytic capacitor C1, an electrolytic capacitor C7, electrolytic capacitors C9-C10, capacitors C2-C6, a capacitor C8, a variable capacitor Ct1, diodes D1-D3, light emitting diodes LED 2-LED 3, triodes BG 1-BG 5, a six-inverter IC1, a dual-voltage comparator integrated circuit IC2, a power switch K1, a power supply E1, a relay J1, a normally open contact J1-1 of a relay J1, a relay J2, a normally open contact J2-1 of a relay J1, a speaker SW and inductance coils L1-L2,

2. The device as claimed in claim 1, wherein the six-inverter IC1 and the six-inverter IC3 are of type TC4069, and the dual voltage comparator IC2 is of type LM 393.

3. The detection and alarm device for preventing children from falling off and getting out of bed as claimed in claim 2, wherein the transistors BG1 and BG6 are NPN tube type 2SC403 4034S, the transistor BG2 is PNP tube type 9012, and the transistors BG3, BG4 and BG5 are NPN tube type 9013.

4. A child fall and exit detection alarm device according to claim 2, wherein the diodes D1-D8 are of the type 1N 4148.

5. A child bed fall and exit detection alarm according to claim 2 or 3, wherein the relays J1, J2 are dc relays, model JRX-20F.

6. The device for detecting and alarming children getting out of bed and preventing children from falling down from the bed as claimed in claim 2 or 3, wherein the variable capacitors Ct1 and Ct2 are ceramic semi-variable capacitors.

7. A child fall prevention and bed exit detection alarm device as claimed in claim 2 or 3, wherein the photoemissive tube LED1 is of the type IR 204C-a.

8. A child fall prevention and bed exit detection alarm device according to claim 2 or 3, wherein the LEDs 2-5 are ordinary red LEDs.

9. A child fall and exit detection alarm device according to claim 2 or 3, wherein the infrared sensor IRX is of the type HS0038a 2.

10. A child fall prevention and bed exit detection alarm device as claimed in claim 2 or 3, wherein the model of the photoelectric receiving tube V1 is PD 204-6B.