JPH0769433B2 - Object detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an electric heater such as an electric carpet or an electric seat,
The present invention relates to an object detection device for use in a device for detecting that an object is located at a front door, an entrance, etc., and particularly to detect only an animal such as a person, a dog, or a cat in the object to detect an animal in the object. The present invention relates to an object detection device that detects the presence or absence.

<Prior Art> An example of a conventional object detection device used in an electric carpet will be described with reference to FIGS. 6 to 14.

As shown in FIG. 6, the object detecting device generates the voltage when the load is applied to the positive terminal of the power source. When there is no generated voltage of the piezoelectric body 41, the voltage across the piezoelectric body 41 becomes a reference voltage ( For example, capacitors 42 ・ 43 and resistors 44.4 for setting to 5V)
Connect one output terminal 46 of the piezoelectric body 41 through the reference voltage setting circuit consisting of 5 and also connect the negative terminal of the power supply, ground the negative terminal of the power supply, and connect the other of the piezoelectric body 41. A positive amplifier of the first operational amplifier 52 for amplifying the voltage generated by the piezoelectric body 41 via a low-pass filter that eliminates noise generated by the influence of the power supply frequency composed of resistors 47, 48, 49 and capacitors 50, 51 at the output terminal 46. Connect the input terminals of the
Of the operational amplifier 52 is connected to the negative input terminal of the resistor 8 and the resistor 9 via the capacitor 50, and the positive power supply terminal of the first operational amplifier 52 is connected to the positive terminal of the power supply. Then, connect the negative terminal of the power supply to the negative power supply terminal of the first operational amplifier 52, connect the negative input terminal and output terminal of the first operational amplifier 52, and output the first operational amplifier 52. The output of the first operational amplifier 52 is inverted to the opposite phase (a positive generated voltage of the piezoelectric body 41 is a negative voltage and a negative voltage is a positive voltage) via a capacitor 53 and a resistor 54 at a terminal. The negative input terminal of the second operational amplifier 55 to be amplified is connected, the positive input terminal of the second operational amplifier 55 is connected to one output terminal 46 of the piezoelectric body 41, and the negative input terminal of the second operational amplifier 55 is connected. Via the variable resistor 56 and the negative feedback resistor 57 that change the amplification factor of the second operational amplifier 55 to the input terminal of The second operational amplifier 55
Output terminal of the second operational amplifier 55 is connected to the output terminal of the second operational amplifier 55 via a resistor 58 so that the input from the second operational amplifier 55 is equal to or more than a first set value (for example, 7 V or more) or less than a second set value. (For example, 3 V or less) and the input from the second operational amplifier 55 is delayed until the time measured by the time measuring means exceeds a predetermined time.
When the voltage is 3 V or less or 7 V or more, a microcomputer 59 (hereinafter referred to as a microcomputer 59) that determines that an animal such as a person, a dog or a cat is located on the electric carpet main body (not shown) and outputs the power for a certain period of time Connect the input terminal of the
A control circuit (not shown) for controlling the energization of a heating element (not shown) provided in the electric carpet body by the output of the microcomputer 59 is connected to the output terminal of the The positive terminal of the power source is connected to the terminal, the negative power source terminal of the microcomputer 59 is connected to the input terminal of the microcomputer 59 via the resistor 60, and the negative terminal of the power source is connected. The object detection device having the above configuration is provided together with the control circuit in an operation section (not shown) provided at a corner of the electric carpet main body, and the piezoelectric body 41 is internally provided over the entire surface of the electric carpet main body. ing.

As shown in FIGS. 7 and 8, the piezoelectric body 41 having the above structure is a polyfluoride that generates a voltage when a load is applied by an animal such as a person, a dog, a cat, or a stationary object such as a desk, chair, or book. A piezoelectric element 61 formed of vinylidene, polytetrafluoroethylene or the like in the form of a film is pulled in a state without bending and is temporarily attached to a container, and output terminals 46 are connected to both ends of the piezoelectric element 61, and the piezoelectric element A solvent in which urethane, silicon, or the like is dissolved is poured into a container to which the element 61 is temporarily attached, and this is burned to form a solid elastic body 62, and the elastic body 62 is attached to the piezoelectric element 61 to form the piezoelectric element 61. The element 61 is formed by covering the elastic body 62.

The piezoelectric body 41 formed as described above generates a constant voltage while a still object such as a desk, a chair, or a book is located on the piezoelectric body 41 as shown in FIG. People, dogs,
When an animal such as a cat moves on the piezoelectric body 41, the piezoelectric body 41 is moved.
The generated voltage changes depending on the applied state of the load applied to 41, and as shown in FIG. 11, when the ambient temperature of the piezoelectric body 41 rises, the piezoelectric element 61 of the piezoelectric body 41 expands to generate a voltage. .

The operation of the electric carpet having the above configuration will be described.

First, a description will be given of a time when an animal operates such as getting on and off the electric carpet main body or moving the animal on the electric carpet main body. When the animal operates on the electric carpet main body, it is applied to the piezoelectric body 41. The applied voltage of the piezoelectric body 41 changes and the generated voltage of the piezoelectric body 41 changes.
Since the generated voltage of 41 includes noise due to the influence of the power supply frequency, the noise is removed by a low pass filter composed of resistors 47, 48, 49 and capacitors 50, 51, and the generated voltage of the piezoelectric body 51 from which the noise is removed. Is amplified by the first operational amplifier 52, the direct current component of the output of the first operational amplifier 52 is blocked by the direct current component blocking capacitor 53, and the direct current component blocking capacitor 53 is blocked. The output is inverted to the opposite phase by the second operational amplifier 55 and amplified by the amplification factor set by the variable resistor 56, and the input from the second operational amplifier 55 to the microcomputer 59 becomes the first set value of 7V or more. When the microcomputer 59 judges that, the microcomputer 59 judges whether the input from the second operational amplifier 55 is equal to or lower than the second set value of 3V after the delay time of 03 seconds has passed. If the input from the second operational amplifier 55 is less than 3V, The microcomputer 59 determines that an animal is located on the electric carpet body, and the microcomputer 59 outputs for a fixed time (for example, 5 minutes). The second operational amplifier is energized after the installed heating element is energized, and after the input of the second operational amplifier 55 to the microcomputer 59 is 7 V or more of the first set value and the delay time is 0.3 seconds. The microcomputer 59 determines that the input is from the second set value of 3 V or more and the microcomputer 59.
Counts that the input from the second operational amplifier 55 is equal to or more than the second set value, and after the counting, the delay time of 0.3 seconds elapses and then the second operational amplifier 55 outputs. It is determined whether or not the input is 3 V or less of the second set value, and if the input from the second operational amplifier 55 is the second set value or more, this is counted and the above operation is repeated, The count is a predetermined number (10 in the embodiment).
The microcomputer 59 determines that the moving body is not located on the electric carpet body, and the microcomputer 59
Does not output, and there is no input from the microcomputer 59 to the control circuit, so that the control circuit does not energize the heating element.

The input from the second operational amplifier 55 is the first
Is less than or equal to the set value of 7V, and if it is greater than or equal to the first set value of 7V, then the input from the second operational amplifier 55 is less than or equal to the second set value of 3V. Determine whether or not
When the microcomputer 59 determines that the second set value is 3 V or less, the microcomputer 59 outputs the second set value of the first set value after the delay time of 0.3 seconds has elapsed.
If the input from the second operational amplifier 55 is 7V or more, the microcomputer 59 determines that an animal is located on the electric carpet body, and the microcomputer 59 determines that the voltage is 7V or more. 59 outputs for a fixed time, and the microcomputer 59
The control circuit conducts electricity to the heating element provided in the electric carpet main body by the output of, and the input from the second operational amplifier 55 to the microcomputer 59 is 3 V or less of the second set value. After the delay time of 0.3 seconds has passed, the above second
The input from the operational amplifier 55 of the
If the setting value is less than 7V, the microcomputer 59 counts that the input from the second operational amplifier 55 is less than the first setting value of 7V, and after the counting, the delay is delayed again. The second operational amplifier 55 described above after 0.3 seconds has elapsed
It is determined whether the input from the second operational amplifier 55 is equal to or lower than the first set value of 7V, and if the input from the second operational amplifier 55 is equal to or lower than the first set value of 7V, it is counted. The operation is repeated, and when the count reaches a predetermined number (10 times in the embodiment), the microcomputer 59 does not output, and there is no input from the microcomputer 59 to the control circuit, and the control circuit outputs to the heating element. Do not energize.

Next, description will be made on the case where a still life such as a desk, a chair, or a book is placed on the carpet body. When the still life is placed on the electric carpet body, the generated voltage of the piezoelectric body 41 becomes a constant voltage. Since the generated voltage includes noise due to the power supply frequency, the noise is removed by the low-pass filter, the generated voltage of the piezoelectric body 41 from which the noise is removed is amplified by the first operational amplifier 52, and The direct current component of the output of the first operational amplifier 52 is blocked by the direct current component blocking capacitor 53, and the output of the first operational amplifier 52, which has blocked the direct current component, is inverted to the opposite phase and amplified by the variable resistor 56. When the input to the microcomputer 59 from the second operational amplifier 55 exceeds the first set value of 7 V or more, and the microcomputer 59 judges that, the microcomputer 59 delays 0.3 seconds. After that, from the second operational amplifier 55, Input to 59 is equal to or less than 3V of the second set value but the piezoelectric 41
Since the generated voltage generates a constant voltage, the input from the second operational amplifier 55 does not fall below the second set value of 3V, and the microcomputer 59 does not output, so the control circuit generates the heat. Do not energize your body.

<Problems to be Solved by the Invention> In the case of an electric carpet using the object detecting device having the above-described configuration, the microcomputer detects the voltage generated by the piezoelectric body provided in the electric carpet body, and detects the voltage. Based on the generated voltage, the microcomputer determines whether or not there is an animal in the object and outputs the electric current to the heating element of the electric carpet main body by the output, and the entire surface of the electric carpet is based on the generated voltage of the piezoelectric body. Since it is controlled by the above, there is unnecessary power consumption by heating the part where the user is not located, and by controlling the electric carpet individually corresponding to the part where the user is located. To prevent this, the electric carpet body may be divided into a plurality of sections, and the piezoelectric body and the heating element may be provided in each of the sections.
The microcomputers are required as many as the number of the piezoelectric bodies, the operation part of the electric carpet in which the microcomputers are provided becomes large, and the operation parts become an obstacle when using the electric carpet, and the number of the microcomputers is large. There is a drawback that the cost increases as the number increases.

It is an object of the present invention to provide an object detection device which eliminates the above drawbacks.

<Means for Solving Problems> The object detecting device of the present invention is for eliminating the above-mentioned drawbacks, and its contents will be described with reference to FIG. 1 showing an embodiment of the object detecting device of the present invention. explain.

As shown in FIG. 1, the object detection device of the present invention is a person, a dog,
A plurality of detection means for detecting a load applied by an animal such as a cat or an object of a still life such as a desk, a chair or a book is provided, and the detection output of each of the plurality of detection means is used to detect an animal in the object. A switching means for sequentially switching and inputting to the determination means for determining the presence or absence is provided.

<Operation> In the object detecting means having the above configuration, each of the plurality of detecting means provided detects a load applied by an animal such as a person, a dog, a cat, etc., or a stationary object such as a desk, child, book, etc. The detection output of the detection means is sequentially switched by the switching means and input to the determination means, and the presence or absence of the animal in the object is determined by the input.

<Example> An example of using the object detecting device of the present invention in an electric carpet will be described with reference to Figs. 1 to 5.

The object detecting device of the present invention is configured as shown in FIG.

In FIG. 1, 2a, 2b and 2c are animals such as people, dogs and cats, desks,
It is a piezoelectric body that generates a voltage when a load is applied by an object such as a chair or book. Reference numeral 3 is a first operational amplifier 3 which sets the voltage across the piezoelectric bodies 2a, 2b, 2c to a reference voltage of 6V when the piezoelectric bodies 2a, 2b, 2c have no generated voltage. The positive input terminal of the operational amplifier 3 is grounded via the resistor 4 and the variable resistor 5 and is connected to the positive power supply terminal via the resistor 1. The negative power supply terminal of the first operational amplifier 3 is grounded, and one terminal of the piezoelectric body 2a is connected to the output terminal of the first operational amplifier 3. The piezoelectric body 2a has a resistor 6 and a capacitor 7 connected in parallel, and is switched together with analog switches 8b and 8c for sequentially switching and outputting the generated voltage of the piezoelectric bodies 2a, 2b and 2c to the other terminal of the piezoelectric body 2a. One terminal of the analog switch 8a forming the switch 8 is connected. Also, one terminal of the piezoelectric body 2b is connected to the output terminal of the first operational amplifier 3, a resistor 9 and a capacitor 10 are connected in parallel to the piezoelectric body 2b, and the other terminal of the piezoelectric body 2b is connected. One terminal of the analog switch 8b is connected. Further, one terminal of the piezoelectric body 2c is connected to the output terminal of the first operational amplifier 3, a resistor 11 and a capacitor 12 are connected in parallel to the piezoelectric body 2c, and the other terminal of the piezoelectric body 2c is connected to the above. Changeover switch 8
Connect one terminal of the analog switch 8c.

The other terminal of the analog switch 8b is connected to the other terminal of the analog switch 8a, and the one terminal of the analog switch 8c is connected to the other terminal of the analog switch 8a. , 16 together with a positive input terminal of a second operational amplifier 18 forming a low-pass filter 17 for removing noise generated by the influence of the power supply frequency, and the resistor 14 is connected to the positive input terminal of the second operational amplifier 18. One terminal of the piezoelectric body 2a is connected to the power source terminal of the second operational amplifier 18, and the ground terminal of the second operational amplifier 18 is grounded.
To the output terminal of the operational amplifier 18 of the second op-amp 18 via a capacitor 19 and a resistor 20 for cutting off the direct current component of the voltage generated by the piezoelectric bodies 2a, 2b, 2c.
The negative input terminal of the third operational amplifier 21 for inverting and amplifying the positive generated voltage of b, 2c to the negative voltage and the negative voltage to the positive voltage is connected, and the third operational amplifier 21 Connect one terminal of the piezoelectric body 2a to the positive input terminal via the resistor 22,
The negative input terminal of the fourth operational amplifier 24 for inverting and amplifying the output of the third operational amplifier 21 is connected to the output terminal of the third operational amplifier 21 via the resistor 23, and the output terminal of the third operational amplifier 21 is connected to the third operational amplifier 21.
The negative input terminal of the third operational amplifier 21 is connected via the resistor 25 for applying negative feedback to the operational amplifier 21, the variable resistor 26, and the capacitor 27, and the positive input terminal of the fourth operational amplifier 24 is connected to the resistor. One terminal of the piezoelectric body 2a is connected via 28, and the input terminal of the microcomputer 30 (hereinafter abbreviated as microcomputer 30) is connected to the output terminal of the fourth operational amplifier 24 via the resistor 29, and The negative input terminal of the fourth operational amplifier is connected via 32 and the capacitor 31. In the microcomputer 30, the input from the third operational amplifier 21 is equal to or more than the first set value (eg, 8 V or more) or less than the second set value (eg, 3 V or less), and the time measured by the time measuring means exceeds a predetermined time. By the time the input from the third operational amplifier 21 is
When the voltage is 3 V or lower or 7 V or higher, it is determined that the animal is located on the electric carpet body (not shown) and outputs for a certain period of time, and the analog switches 8a, 8b, 8c of the changeover switch 8 for 2 seconds. Each of them is sequentially closed, and a heating element (not shown) is output by the microcomputer 30 to the output terminal 30a which outputs the result of judging the presence or absence of the animal by the generated voltage of the piezoelectric body 2a of the microcomputer 30. Connect a control circuit to control, connect the control circuit to the output terminal 30b that outputs the determination of the presence or absence of the animal by the generated voltage of the piezoelectric body 2b of the microcomputer 30, the piezoelectric body 2c of the microcomputer 30 The control circuit is connected to the output terminal 30c that outputs the determination of the presence or absence of the animal based on the generated voltage of, and the analog switches 8a, 8b, 8c of the changeover switch 8 of the microcomputer 30 are sequentially closed for 2 seconds each. Output terminal 30d for outputting that signal, 30e, connecting said changeover switching switch 8 to 30f.

The object detection device having the above configuration is provided together with the control circuit in an operation section (not shown) provided at a corner of the electric carpet body, the electric carpet body is divided into three sections, and the three sections are provided. The aforesaid piezoelectric body 2a and a heating element A (not shown) corresponding to the piezoelectric body 2a are internally provided in a section divided into
A heating element B (not shown) corresponding to the piezoelectric body 2b and the piezoelectric body 2a is divided into three sections b of the electric carpet body.
Is internally provided, and the piezoelectric body 2c and the heating element C corresponding to the piezoelectric body 2c are provided in the three sections c of the electric carpet body.
(Not shown) is installed internally.

The operation of the electric carpet having the above structure will be described with reference to FIGS. 2 to 5.

First, the operation of the main program of the electric carpet will be described with reference to FIG. 2. The time for outputting the signal for closing the analog switch 8a, 8b, 8c of the changeover switch 8 of the microcomputer 30 for 2 seconds is described. A high level (hereinafter, referred to as H level) for resetting the first time counting time and closing the analog switch 8a is output from the output terminal 30d of the microcomputer 30, and a low level is output from the other output terminals 30e, 30f. (Hereinafter referred to as "L level") and starts counting the first time count time, the output closes the analog switch 8a of the changeover switch 8 and opens the analog switches 8b and 8c to open the analog When the switch 8a is closed, the generated voltage of the piezoelectric body 2a provided in the section a divided into three sections of the electric carpet body is output, and the piezoelectric body 2a is output.
It is judged by the sub-program of the microcomputer 30 (details of the operation of the sub-program will be described later) whether or not the animal is positioned in the section a of the electric carpet body by the voltage generated from 2a, and the judgment is made by the microcomputer 30. As a result, in the electric carpet, the control circuit controls the heating element A provided in the section a of the body, and when the first time counting time has not passed 2 seconds, the sub program is returned to and the first time counting is performed. After a lapse of 2 seconds, the first clock time is reset, and the microcomputer 30 outputs the H level from the output terminal 30e.
The output terminals 30d and 30f of 0 output L level and start measuring the first clock time, and the output closes the analog switch 8b of the changeover switch 8 and the analog switch of the changeover switch 8 is closed. 8a, 8c are opened, and the electric switch is closed by closing the analog switch 8b.
The generated voltage of the piezoelectric body 2b provided in the section is output, and it is judged by the sub-program of the microcomputer 30 whether or not the animal is located in the section b of the electric carpet body by the generated voltage from the piezoelectric body 2b. However, the control circuit controls the heating element B provided in the section b of the electric carpet main body according to the result determined by the microcomputer 30, so that the first clock time is 2
If the second time has not elapsed, the program returns to the sub program, and if the first time measuring time exceeds 2 seconds, the first time measuring time is reset, and the microcomputer 30 outputs the H level from the output terminal 30f. Output particles 30d and 30e of the microcomputer 30 are L
At the same time as outputting the level, the measurement of the first clocking time is started, and the output from the microcomputer 30 closes the analog switch 8c of the changeover switch 8 to close the piezoelectric section installed in section c of the electric carpet body. The generated voltage of the body 2c is output, and the generated voltage from the piezoelectric body 2c determines whether or not the animal is located in the section c of the electric carpet body by the sub-program of the microcomputer 30. The control circuit controls the heating element C provided in the section c of the electric carpet main body according to the result of the determination, and returns to the sub-program when the first clocking time does not exceed 2 seconds and returns to the sub-program. The clocking time of 1 is reset and the above operation is repeated from the beginning.

Next, the operation of the electric carpet subprogram
It will be described with reference to the drawings.

A description will be given of a case where an animal gets into and out of the section a of the electric carpet body or moves such that the animal moves when the analog switch 8a of the changeover switch 8 is closed. When operating in the section a of the main body, the applied state of the load applied to the piezoelectric body 2a changes and the generated voltage of the piezoelectric body 2a changes, and the changeover switch 8 causes the analog switch 8a by the output from the output terminal 30d of the microcomputer 30. , The voltage generated by the piezoelectric body 2a is output. Since the voltage generated by the piezoelectric body 2a includes noise due to the influence of the power supply frequency, the noise is removed by the low-pass filter 17, and the noise is removed. The voltage generated by the piezoelectric body 1a is inverted to the opposite phase by the third operational amplifier 21, amplified by the amplification factor set by the variable resistor 26, and the output of the third operational amplifier 21 is inverted again by the fourth operational amplifier 24. The signal is inverted into a phase, amplified, and input to the microcomputer 30. The microcomputer 30 outputs from the fourth operational amplifier 24 after a delay of 0.1 second to eliminate the influence of noise generated when the analog switch 8a is closed. Input is above the first set value of 7V,
If the input is 7V or more, if the microcomputer 30 judges that, the microcomputer 24 outputs the input from the fourth operational amplifier 24 below the second setting value of 3V after the delay time of 0.1 seconds has elapsed. If the input from the fourth operational amplifier 24 is 3 V or less, the microcomputer 30 outputs the output terminal 30d.
Output of the output terminal 30d
When the output of the electric carpet is H level,
When the microcomputer 30 determines that the animal is located on the segment, the microcomputer 30 outputs from the output terminal 30a for a certain period of time, and whether the first time-measurement time of the operation of the main program described in FIG. Move to the judgment of whether or not
The control circuit energizes the heating element A in the section a of the electric carpet body by the output from the output terminal 30a.

When the input from the fourth operational amplifier 24 is 3V or more, the microcomputer 30 counts 1 that the input from the fourth operational amplifier 24 is 3V or more, and the count number is a predetermined number (for example, 10). If the count number is less than 10 times, it is again determined whether the input from the fourth operational amplifier 24 is 3 V or less after the delay time of 0.1 seconds has elapsed. When the number of counts reaches 10, the microcomputer 30 determines that no animal is located on the electric carpet body, does not output, and does not energize the heating element A of the electric carpet body. .

Then, the microcomputer 30 determines whether the input from the fourth operational amplifier 24 is 7V or less after the analog switch 8a is closed and a delay time of 0.1 seconds has elapsed, and then the input is 3V or less. Whether it is 3 V or less, the microcomputer
Reference numeral 24 is for judging whether or not the input from the fourth operational amplifier 24 is 7V or more after a delay time of 0.1 seconds, and if the input from the fourth operational amplifier 24 is 7V or more, the microcomputer is Reference numeral 30 determines whether the output of the output terminal 30d is at the H level, and when the output of the output terminal 30d is at the H level, it is determined that the animal is located on the section a of the electric carpet body. The microcomputer 30 outputs from the output terminal 30a for a certain period of time, and shifts to the judgment as to whether or not the first clock time of the operation of the main program explained in FIG. The output from 30a causes the control circuit to energize the heating element A of section a of the electric carpet body.

Further, it is determined whether or not the input from the fourth operational amplifier 24 is 7V or more, and if it is 7V or less, the fact is counted, and it is determined whether or not the count number is 10 times or more. If the count number is less than 10 times, it is judged again whether the input from the fourth operational amplifier 24 is 7V or less after a delay time of 0.1 seconds, and when the count number becomes 10 times, the electric The microcomputer 30 determines that the animal is not located on the carpet body and does not output, and the heating element A of the electric carpet body is not energized.

A case where a still life such as a desk, a chair, a book is placed on the electric carpet body will be described. When the still life is placed on the a section of the carpet body, the piezoelectric body 2a is fixed. Is generated, and the generated voltage includes noise due to the power supply frequency. Therefore, the noise is removed by the low pass filter 17, and the generated voltage of the piezoelectric body 2a from which the noise is removed is reversed by the third operational amplifier 21. Variable resistance by reversing the phase
It is amplified by the amplification factor set in 26, the output of the third operational amplifier 21 is inverted again in the opposite operational phase by the fourth operational amplifier 24, is amplified, and is input to the microcomputer controller 30.
Judges whether or not the input from the fourth operational amplifier 24 is 7 V or more after the analog switch 8a is closed and a delay time of 0.1 seconds has elapsed, and the microcomputer determines that the input is 7 V or more.
30 is the fourth operational amplifier 2 after 0.1 seconds of delay time has elapsed
It is determined whether or not the input from 4 to the microcomputer 30 is 3 V or less, but since the piezoelectric body 2a generates a constant voltage, the input from the fourth operational amplifier 24 is 7 V or more, The voltage does not fall below 3V, the microcomputer 30 judges that the animal is not located on the section a of the electric carpet body, and does not output, and the control circuit energizes the heating element A. Absent.

It should be noted that the microcomputer 30 determines whether the input is from the section a, section b or section c of the electric carpet body depending on which of the output terminals 30a, 30b and 30c outputs the H level. Heating element A, heating element B according to classification a, classification b, classification c
The energization of the heating element C is controlled.

<Effects of the Invention> The object detection device of the present invention detects the load applied by animals such as humans, dogs, and cats, and still objects such as desks, chairs, and books with a plurality of detection means, The detection outputs of the detection means are sequentially switched, for example, in a short time every 2 seconds and input to one determination means, and the presence or absence of an animal in the object is determined by the input, so that the plurality of detection means The presence of an animal in an object can be extremely quickly and accurately determined with a simple configuration by a single determination means that is less than the number of devices, and the presence of an animal in an object can be reliably detected. If it is used as a sensor for detecting the presence or absence of the electric carpet, the electric carpet or the like can be manufactured at low cost by dividing the electric carpet or the like into a plurality of sections and detecting and controlling the animals according to each section. Detection The operating unit such as an electric carpet in which the device is provided can be made small, and the operating unit does not get in the way.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the object detecting apparatus of the present invention, FIG. 2 is a main flow chart showing the operation of a main program of the object detecting apparatus of the present invention, and FIG. 4 is a sub-flowchart showing the operation of the sub-program, FIG. 4 is a voltage waveform diagram showing the closing period of the analog switch 8a of the changeover switch 8 of FIG. 1, and FIG.
FIG. 6 is a voltage waveform diagram input from the fourth operational amplifier 26 to the microcomputer 30, FIG. 6 is a circuit diagram showing an example of a conventional object detecting device, FIG. 7 is a longitudinal sectional view showing the piezoelectric body of FIG. 8 is a cross-sectional view showing the piezoelectric body of FIG. 6, FIG. 9 is a voltage waveform diagram showing the voltage generated by the piezoelectric body of FIG. 6 when a still object is placed, and FIG. 10 is the piezoelectric body of FIG. Fig. 11 is a voltage waveform diagram showing the voltage generated by the body's movements of the animal, Fig. 11 is a voltage waveform diagram generated by the piezoelectric body due to temperature changes, and Figs. 12 and 13 are inputs to the microcomputer shown in Fig. 6. FIG. 14 is a flowchart showing the operation of the object detecting device of the present invention. In the figure, 2a, 2b, 2c: piezoelectric body, 8: changeover switch, 30: microcomputer.

Claims (1)

[Claims] 1. An object detection device for detecting the presence or absence of an object by the applied load, and a plurality of detection means for respectively detecting the load applied by the object in a plurality of sections divided by an electric carpet or the like. , One determination means for determining whether or not the object is an animal based on the detection output of each of the plurality of detection means, and the detection output of each of the plurality of detection means to the determination means, for example An object detection device, comprising: a switching unit for sequentially switching and inputting in a short time every 2 seconds.