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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view of a pulse sensor
according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams
showing different pulse calculation circuits. 1: Polymer piezoelectric element, 6: Soft member.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse sensor
used in a pulse counting circuit or the like. The conventional pulse sensor has taken out the pulse
number from the living body by means of optical communication or using a condenser
microphone or the like. In this invention, a very thin polymer pressure 1E element developed
recently is used to provide a pulse-day sensor which has a property of being attached to a living
body. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1
shows a pulse sensor 0 (]) according to the present invention, l-2, lr, + ::-, 1 is Polymer
piezoelectric elements such as polyvinylidene fluoride (PVDF) 2 is an aluminum film deposited on
the entire surface of element 1 6 is a four-electric metal store for attaching lead wires 4 and is
made of copper or brass . Reference numeral 5 denotes an output portion of the lead wire 4, and
6 denotes a flexible and highly insulating resin that covers the entire surface of the aluminum
film except for the output portion 5. When the pulse sensor 0 configured in this way is applied to
the 1jlu fixed part, blood flow pressure is applied to the polymer piezoelectric element 1 through
the skin, pressure is generated in the element 1, and a pulse signal is output from the lead 4 Ru.
Next, an example of a pulse counting circuit using the 51st beat sensor 0 will be described with
reference to FIG. In the figure, 10 is a 91st beat sensor shown in FIG. The bias circuit to which
the J-gate 4 is connected changes the bias of the amplifier circuit 12 by IJ, but this variable
operation is a notification of the pulse notification circuit 16 which is driven by the output of the
multiplication circuit 12 The condition is matched with the measurer's own blood flow pressure
transmitted via softness @ i1 = 6. (2) 14 is a pulse oscillator, and 15 is a counter for counting the
output of the oscillator 14. Since the reset signal is applied via the delay recess 16 for each
output of the amplification circuit 12, the counter 5 has a pulse cycle The numerical value
proportional to is counted. A gate circuit 17 reads out the count value of the counter 5 by adding
the output of the amplifier circuit 12. The numeral 18 designates a register for reading out the
numerical value and the numeral 19 designates an arithmetic circuit. Assuming that the pulse
cycle is T, the lower X 60 is calculated to calculate the pulse rate per minute. Reference numeral
20 denotes a register in which the calculation result is stored. The timing at which the calculation
result is recorded in the register is obtained by dividing the output of the oscillator 14 by the
dividing circuit 21 and controlling the divided output. This is because it is difficult for the display
9 to display the variation when the operation display is performed for each output of the
amplifier circuit 12 and it is in the divide-by-two frequency circuit 21. Some calculation results
may be updated without being displayed.
Reference numeral 22 denotes a display circuit that digitally displays the contents of the register
20. (3) In this embodiment, since the pulse rate per minute is calculated for each pulse cycle, the
pulse rate for each calculation increases in variation. In the other embodiment shown in FIG. 6,
since the pulse rate is calculated based on the average pulse cycle as compared with the abovedescribed embodiment, the variation is small. In the figure, the same components as those in FIG.
2 have the same protection 1.t, and the description thereof is partially omitted. A divider 23
divides the output of the amplifier circuit 12 and is set to 5 in this embodiment, so that the
counter 5 counts pulses from the pulse oscillator 14 for 5 pulse cycles. You The count value is
read out at the branch output, and reset at the divided output via the delay circuit 24. Therefore,
the pulse rate calculated by the arithmetic circuit 19 is based on an average of one pulse cycle,
and it is approximated by iuf counting the pulse rate per driver in practice 1). In the above, one
example of the pulse sensor according to the present invention and its application have been
described, but if the above-described pulse sensor is stretched on a frame, the sensitivity of the
sensor 4) increases. As described above, in the pulse sensor according to the present invention, a
very thin polymeric piezoelectric element is coated with a soft member to maintain high adhesion
to the measurement site and to be easy to use as a sensor. The present invention has a special
effect that the conventional pulse sensor can not do, that the measured output can also be
confirmed by the user's sense.
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