JPS644157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic wristwatch with a pulse meter having a photoelectric pulse detector.

When installing a photoelectric pulsometer in a wristwatch, which illuminates the skin surface where blood vessels are located with light from a light source such as an LED and detects the intensity of the reflected light as a pulse, which changes depending on the pulsation, a button-type battery, etc. The problem is that the power required to cause the light source to emit light is large compared to a small capacity power supply. On the other hand, since pulses are detected as periodic pulses, there is no need to perform a detection operation in the middle of one pulse cycle, and the normal pulse rate is several tens to
It is approximately 200 beats/minute, and it is possible to set an upper limit on the pulse rate that can be measured within a range that does not cause problems.

In view of the above aspects, the present invention stops the operation of the light source of the photoelectric pulse detection circuit after detecting the pulse pulse, and
To provide a wristwatch with a pulse meter that consumes less power in the light source by restarting the light source of the photoelectric pulse detection circuit after a predetermined period of time (a time shorter than the pulse rate period determined as the upper limit) has elapsed. .

Next, the present invention will be explained based on the block diagram of FIG. 1 to 5 are the configurations of well-known electronic watches;
1 is a crystal oscillator circuit, 2 is a frequency dividing circuit that divides the output of the oscillation circuit 1, 3 is a counting circuit that counts the frequency-divided signal and outputs an output for each display unit, 4 is a time decoder 4a and a pulse pulse circuit. This decoder is composed of a decoder 4b. The decoder 4a converts the output of the counting circuit 3 and displays the time on the time display section 5a of the display device 5.
The pulse rate display section 5b of the display device 5 displays the pulse cycle or the number of pulses per minute.
The photoelectric pulse detection circuit 7 (hereinafter abbreviated as the detection circuit 7) emits light from a light source such as an LED to the skin surface where blood vessels are located, and a light receiving element receives changes in reflected light that change according to the pulse and generates electricity. It is a circuit that outputs a signal, and its detailed structure is described in, for example, Japanese Patent Laid-Open No. 83474/1983. The detection circuit 7 of the present invention detects the LEDs in the detection circuit 7 by the logic "L" level light emission control signal PC from the timer circuit 6.
The power is cut off so that the light emitting operation is prohibited. Pulse signal output as an electrical signal from the detection circuit 7
Noise components are removed from PA in a wave circuit 8, and the signal is further amplified in an amplifier circuit 9, after which it is converted into a rectangular wave signal PB in a waveform shaping circuit 10. The timer circuit 6 is the detection circuit 7
This circuit prohibits the light emitting operation of the light source of the detection circuit 7, and the light emitting operation of the light source of the detection circuit 7 is stopped by resetting the timer circuit 6 at the fall timing of the rectangular wave signal PB from the waveform shaping circuit 10. Furthermore, immediately after this reset operation, the timer circuit 6 counts the signal from the frequency dividing circuit 2, and after a certain period of time T (a time shorter than the upper limit pulse cycle) has elapsed, the timer circuit 6 outputs the light emission control signal PC of logic "H" level. is output, and the light source of the detection circuit 7 is operated to emit light again. The arithmetic circuit 11 is a circuit that inputs the rectangular wave signal from the waveform shaping circuit 10 and converts it into a pulse cycle or pulse rate per minute.The output is input to a decoder 4b and is displayed on the display device 5 as the cycle or pulse rate per minute. The pulse rate is displayed on the pulse display section 5b. FIG. 2 is a time chart in FIG. 1, and the signal PA is a pulse signal detected by the detection circuit 7. signal PB is signal
The light emission control signal PC, which is a rectangular wave signal obtained by waving PA, amplifying it in the amplifier circuit 9, and making it into a pulsed rectangular wave in the waveform shaping circuit 10, is the output of the timer circuit 6, and is generated in accordance with the falling edge of the rectangular wave signal PB. After a certain period of time T (shorter than the cycle of the upper limit pulse rate) has elapsed after the reset operation, the output is inverted and remains in the logic "H" level until it is reset again by the next rectangular wave signal PC.

PD indicates the voltage supplied to the LED of the detection circuit 7. When the logic is "H" level, the LED lights up (lights up), and when it takes the logic "L" level, the LED turns off (does not emit light). This indicates that
The LED is turned off for a certain time T, and after the elapse of a certain time T, the timer circuit 6 is turned off by the next rectangular wave signal PB.
The LED will remain lit until it is reset. In the block diagram shown here, only the operation of the light source of the detection circuit 7 is prohibited for a certain period of time T, but the operation is not limited to this, and the operation of other wave circuits, amplifier circuits, waveform shaping circuits, etc. can also be prohibited. Of course it is possible. As described above, according to the present invention, it is possible to provide an electronic timepiece with a pulse meter that has a photoelectric pulse detector and consumes less power.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a time chart of signals in FIG. DESCRIPTION OF SYMBOLS 1... Oscillation circuit, 2... Frequency dividing circuit, 3... Counting circuit, 4... Decoder, 5... Display device, 6...
...Timer circuit, 7...Photoelectric pulse detection circuit, 8
...Wave circuit, 9...Amplification circuit, 10...Waveform shaping circuit, 11...Arithmetic circuit.

Claims (1)

[Scope of Claims] 1. A photoelectric pulse detection circuit having a light source and a light receiving element; an arithmetic circuit that inputs filtered, amplified, and waveform-shaped pulse signals detected by the photoelectric pulse detection circuit to calculate a pulse rate; In a pulse meter equipped with a display device that displays the pulse rate calculated by the calculation circuit, when the photoelectric pulse detection circuit detects the pulse signal, the light emitting operation of the light source is prohibited for a certain period of time based on the pulse signal. 1. A wristwatch with a pulse meter, comprising a timer circuit that outputs a light emission control signal to the photoelectric pulse detection circuit.