JP3985956B2 - Pulse meter - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a pulse counting device for a wristwatch-type pulsometer, and more particularly to a wristwatch that counts a pulse when a human is at rest and a pulsometer attached to another part.
[0002]
[Prior art]
There are many types of wristwatch-type pulsometers on the market today. Most pulsometers are based on the LED and photodiode optical sensor system, which turns on the LED, transmits and reflects the fingertip, and converts the light-receiving current of the photodiode that receives and transmits the light from the LED transmitted through and reflected from the fingertip into a voltage. The pulse rate is counted with the amplitude of the voltage.
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-149326
[Problems to be solved by the invention]
In the above-described method, a human must perform a measurement consciously by performing an operation such as attaching a sensor connected to the watch to a fingertip or placing a fingertip on a sensor built in the watch. Moreover, since this method has to turn on the LED, the current consumption is high, and eventually the LED deteriorates and measurement becomes impossible.
[0004]
The present invention aims to eliminate the above-mentioned conventional drawbacks, and its purpose is to sandwich a urethane or rubber-like pad in which air is sealed between a wristwatch and an arm so as to prevent a weak pulse vibration of a human being. The air vibration is converted into an air vibration inside the pad, the air vibration is converted into an electric signal by a piezoelectric element, and the pulse rate is counted.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention according to claim 1 of the present application is a portable pulsometer that counts a human pulse rate in close contact with a human body .
An air pad that closely contacts a position where the pulse vibration of the human body can be detected, and detects the minute vibration;
Through air communication inside the air pad, and a fine pressure sensor means for converting the air vibration in the air pad conductive No.氣信,
A first filter for selecting a micro-vibration due to the human body of the pulse from the human body micro-vibrating signal the micro pressure sensor unit detects,
Means for arranging the absolute values of the peak values of the vibration waveform selected by the first filter over time;
A second filter that forms one triangular wave per pulse from a pattern shape in which absolute values of peak values of vibration waveforms selected by the first filter are arranged with time ;
Means for counting the number of output waveforms of the second filter;
Display means for displaying the numerical value counted by the counting means as a pulse rate;
A pulse meter is provided.
According to a second aspect of the present invention, in addition to the first aspect of the present invention, the air pad has a bias means for maintaining an internal air capacity therein. I will provide a.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of the present invention suitable for a wrist watch type pulse meter. In FIG. 1, watch bands 2 and 3 are coupled to both ends of a wrist watch type pulse meter 1, and the wrist watch type pulse meter 1 is wound around an arm 4 by these arm bands 2 and 3.
[0007]
FIG. 2 is a cross-sectional view showing the inside of the wristwatch type pulsometer 1 from the lateral side.
The wristwatch-type pulsometer 1 is fitted with a transparent glass 6 serving as a display window on the surface of the case 5. An inner lid 7 is attached to the back side of the case 5, and a back lid 8 is attached to the lower side thereof. Under the transparent glass, a well-known clock device 10 including a pulse counter 9 which is the heart of the pulse meter is provided. Between these and the transparent glass 6, time is shown and the pulse is also displayed. A liquid crystal display panel 11 for displaying numbers is provided. FIG. 3 is a front view of the liquid crystal display panel 11. The liquid crystal display plate 11 is provided with a time display unit 12 and a pulse rate display unit 13. Between the inner lid 7 and the back lid 8, an air pad 14 in which air for detecting minute vibrations transmitted from a human arm is sealed with a urethane sheet or a rubber sheet is installed. A small pressure sensor 15 that converts the vibration of the internal air into an electric signal is fitted into the inner lid 7. The air pad 14 and the fine pressure sensor 15 are integrated. Below the air pad 14 is a cover 16 that protects the surface of the air pad 14, and the cover 16 moves up and down when it is in close contact with the arm 4.
[0008]
FIG. 4 is a cross-sectional view of the air pad 14 and the fine pressure sensor 15.
In FIG. 4, a fine pressure sensor 15 is fitted into the air pad 14 and is integrated, and is connected to the inside of the air pad 14 and the sensor inner chamber 19 inside the case 18 of the fine pressure sensor 15. It is sealed. These sealed portions and the sensor outer chamber 20 are partitioned by a piezoelectric element 21. When the wristwatch-type pulsometer 1 is attached to the arm 4, the arm comes into close contact with the cover 16, and the air pad 14 is pressed, and pressure is applied to the air inside the air pad 14 and the sealed portion of the inner chamber 19 of the fine pressure sensor 15. The air in the sealed portion is in a state of generating air vibrations even for slight arm vibrations. At that time, the pulse vibration emitted from the arm 4 is transmitted to the air in the sealed portion, and the air vibration of the pulse vibration is generated. The air vibration is transmitted from the sealed portion to the piezoelectric element 21 of the fine pressure sensor 15, and the piezoelectric element 21 converts the air vibration into an electric signal and outputs the electric signal to the substrate 22. Also, when the air pressure sensor 15 is fitted into the air pad 14, if the air pad 14 is sealed in a crushed state, the internal air cannot be secured sufficiently and the air vibration becomes dull. A spring 17 is incorporated in order to secure and secure sufficient air.
[0009]
FIG. 5 is a block diagram showing a circuit of the pulse counter 9 according to the present invention.
The pulse counter 9 is a circuit that processes the vibration waveform from the piezoelectric element 21 and calculates the human pulse rate. In FIG. 5, the pulse waveform detected by the piezoelectric element 21 is high impedance. The pulse waveform of high output impedance is input to the pulse counter 9 via the substrate 22, converted from high impedance to low impedance by the impedance converter 23, and output to the next circuit.
[0010]
Reference numeral 24 denotes a filter that passes the frequency band of the pulse amplitude of 3.0 Hz to 5.0 Hz and removes other noise frequency bands. An amplifier 25 amplifies the pulse amplitude output from the filter 24. Reference numeral 26 denotes an absolute value converter. Since the pulse amplitude waveform output from the amplifier 25 is amplified to + voltage and −voltage with 0V as the center, the absolute value converter 26 makes the amplitude only to the + voltage side. . The filter 27 passes the frequency band of 0.5 Hz to 1.5 Hz. As a result, one peak waveform such as a triangular wave is output for one pulse. By converting this triangular wave into a square wave by the pulse converter 28, a pulse count pulse of one square wave is output for one beat.
[0011]
Next, details of a mechanism for counting human pulses will be described.
Human blood is pumped out to blood vessels throughout the body by the pulsation of the heart. When the blood is pumped into the blood vessel, a slight vibration of the blood circulation is emitted. Such a slight vibration caused by the heartbeat is detected from the arm and the pulse rate is counted.
[0012]
In FIG. 6, when the wrist-type pulsometer 1 is attached to a human arm 4, the wrist-type pulsometer 1 is caused by slight vibration generated from the arm 4 when blood is pumped out to the blood vessel by the heartbeat at rest. The air inside the air pad 14 built in the air causes air vibrations and is transmitted to the piezoelectric element 21. The piezoelectric element 21 that has received the vibration converts air vibration into a high-impedance electrical signal, which is input to the impedance converter 23 via the substrate 22 and converted to low impedance. After the conversion, noise components other than 3.0 Hz to 5.0 Hz are removed by the filter 24 and amplified by the amplifier 25. A signal output from the amplifier 25 is shown in FIG. In the present invention, when blood is pumped into the blood vessel due to the pulsation of the heart, as shown in FIG. 6, the peak value is initially small, then the peak value is maximized, and gradually attenuates. A 0 Hz amplitude waveform is repeatedly output.
[0013]
The magnitude of the peak value of the amplitude waveform in FIG. 6 varies depending on the individual. It is the amplifier 25 that adjusts this, and by adjusting the amplification degree of the amplifier 25, the magnitudes of the peak values of all these pulse amplitudes can be made constant.
[0014]
Since the pulse waveform of the amplifier 25 swings to the + voltage side and the −voltage side around 0V, it is difficult to distinguish between 1 pulse and 1 pulse. Order to facilitate the distinction between the 1 pulse -1 pulse, the absolute value converter 26, the pulse amplitude of the amplifier 25 of the amplitude waveform as shown in FIG. 7 - to convert the amplitude waveform of the voltage-side + the voltage side.
[0015]
The amplitude waveform converted to the + voltage side by the absolute value converter 26 is used to remove one frequency band other than 0.5 Hz to 1.5 Hz by the filter 27 in order to make one pulse into one waveform, and is shown in FIG. Convert to a triangular wave like
[0016]
The triangular wave is input to the pulse converter 28 and converted into a square wave shown in FIG. That is, when blood circulation (one pulse) occurs due to one beat of the heart, one square wave is output from the pulse counter 9.
[0017]
By the above air vibration-electrical signal conversion method, the human body can be transmitted from the arm to the bottom cover of the case simply by incorporating the air pad 14, the fine pressure sensor 15, and the pulse rate counter 9 in a case such as a general wristwatch. The pulse can be taken and the pulse rate can be counted.
[0018]
As mentioned above, although this invention was demonstrated by the above-mentioned embodiment, various deformation | transformation and application are possible within the range of the main point of this invention, and these deformation | transformation and application are not excluded from the scope of the present invention.
[0019]
【The invention's effect】
As described above in detail, the invention according to claim 1 of the present application is a portable pulsometer that closely contacts a human body and counts a human pulse rate.
An air pad that closely contacts a position where the pulse vibration of the human body can be detected, and detects the minute vibration;
Through air communication inside the air pad, and a fine pressure sensor means for converting the air vibration in the air pad conductive No.氣信,
A first filter for selecting a micro-vibration due to the human body of the pulse from the human body micro-vibrating signal the micro pressure sensor unit detects,
Means for arranging the absolute values of the peak values of the vibration waveform selected by the first filter over time;
A second filter that forms one triangular wave per pulse from a pattern shape in which absolute values of peak values of vibration waveforms selected by the first filter are arranged with time ;
Means for counting the number of output waveforms of the second filter;
In the portable pulsometer which counts the human pulse rate in close contact with the weak human body by the air pad 14, since the display unit includes the numerical value counted by the counting unit as the pulse rate,
An air pad that closely contacts a position where the pulse vibration of the human body can be detected, and detects the minute vibration;
Through air communication inside the air pad, and a fine pressure sensor means for converting the air vibration in the air pad conductive No.氣信,
A first filter for selecting a micro-vibration due to the human body of the pulse from the human body micro-vibrating signal the micro pressure sensor unit detects,
Means for arranging the absolute values of the peak values of the vibration waveform selected by the first filter over time;
A second filter that forms one triangular wave per pulse from a pattern shape in which absolute values of peak values of vibration waveforms selected by the first filter are arranged with time ;
Means for counting the number of output waveforms of the second filter;
The display means with the numerical value counted by the counting means as pulse rate, and the pulse vibration is converted into electric vibration, the noise frequency band is removed by a filter of the signal, only the pulse waveform is taken out, and the pulse rate is counted. Can do. In addition, unlike the conventional wrist watch type pulse meter, the pulse rate can be accurately and simply counted by putting it on the arm and resting it without putting the fingertip on the optical element and transmitting or reflecting it to count the pulse rate. can do.
In the invention according to claim 2 of the present application, in addition to the invention according to claim 1, the air pad has bias means for maintaining the internal air capacity therein. Air is always present, and the pulse rate of the human body can be accurately and easily counted.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which a wristwatch-type pulsometer according to the present application is attached to an arm.
FIG. 2 is a cross-sectional view showing a state in which the wristwatch type pulsometer of the present application is attached to an arm.
FIG. 3 is a front view of the liquid crystal display panel 11;
FIG. 4 is an enlarged cross-sectional view of the vicinity of the air pad 14;
FIG. 5 is a block diagram showing a circuit of a pulse counter 9 according to the present invention.
FIG. 6 is a characteristic diagram showing a pulse waveform of a human body.
FIG. 7 shows an output waveform of the absolute value converter 26;
FIG. 8 is a triangular waveform characteristic diagram showing the pulse of the human body.
FIG. 9 is a total of pulses indicating a human pulse.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wristwatch type pulse meter 2 ... Watch band 3 ... Watch band 4 ... Arm 5 ... Case 6 ... Transparent glass 7 ······ Inner lid 8 ··· Back lid 9 ··· Pulse counter 10 ··· Clock device 11 ··· Liquid crystal display panel 12 ··· Time display unit 13 ..... Pulse display 14 ... Air pad 15 ... Low pressure sensor 16 ... Cover 17 ... Spring 18 ... Case 19 ... Sensor inner chamber 20 Sensor outer chamber 21 Piezoelectric element 22 Substrate 23 Impedance converter 24 Filter 25 Amplifier 26... Absolute value converter 27... Filter 28... Pulse converter

Claims (2)

In a portable pulsometer that counts the human pulse rate in close contact with the human body ,
An air pad that closely contacts a position where the pulse vibration of the human body can be detected, and detects the minute vibration;
Through air communication inside the air pad, and a fine pressure sensor means for converting the air vibration in the air pad conductive No.氣信,
A first filter for selecting a micro-vibration due to the human body of the pulse from the human body micro-vibrating signal the micro pressure sensor unit detects,
Means for arranging the absolute value of the peak value of the selected vibration waveform by the first filter over time,
A second filter that forms one triangular wave per pulse from a pattern shape in which absolute values of peak values of vibration waveforms selected by the first filter are arranged with time ;
Means for counting the number of output waveforms of the second filter;
Display means for displaying the numerical value counted by the counting means as a pulse rate;
A pulse meter comprising: 2. The pulsometer according to claim 1, wherein the air pad has bias means for maintaining an internal air capacity therein.

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