JP2009131297A - Pulse measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulse measuring device capable of stably measuring pulses even during exercise. <P>SOLUTION: The pulse measuring device is provided with a data table (DT1) in which projection amount data of a pulse detection part is made to correspond to an acceleration level and a pulse rate and can be registered, and when the projection amount of the pulse detection part is changed and the detection of the pulse becomes possible, the data indicating the projection amount of the pulse detection part at present are stored in the storage area of the data table (DT1) corresponding to the pulse rate and the acceleration level measured at the point of time when the detection of the pulse becomes possible. Also, when the detection of the pulse becomes impossible, the projection amount data are read from the storage area of the data table (DT1) corresponding to the pulse rate measured immediately before it becomes impossible and the acceleration level measured at present, and the projection amount of the pulse detection part is matched with the read projection amount data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulse measuring device that is mounted on, for example, an arm and detects a pulse.

  2. Description of the Related Art Conventionally, a pulse measuring device that is attached to an arm or the like and optically detects a pulse is known (for example, Patent Documents 1 and 2). In such a pulse measuring device, a light-emitting element and a light-receiving element are provided in the pulse detector, and light is emitted under the skin by the light-emitting element, and the reflected light is received by the light-receiving element. Is configured to detect. Since the light transmitted under the skin is reflected by the blood and enters the light receiving unit, the light receiving unit outputs a signal indicating a pulse.

Patent Documents 1 and 2 disclose a technique for performing stable pulse measurement by forming a pulse detector in a convex shape and causing the pulse detector to bite into the skin.
Japanese Patent No. 3722203 JP 2003-265441 A

  Conventional pulse measurement devices have been developed on the premise that pulse measurement is performed in a resting state, and there has been no device that can stably measure a pulse even during exercise.

  During exercise, the intensity of the pulse wave signal changes due to fluctuations in blood pressure and blood flow at the measurement site, and noise due to body movement is mixed into the pulse wave signal, so stable under the same conditions as at rest Detection of a typical pulse was difficult.

  In addition, when performing pulse measurement during exercise, it is assumed that different exercises are performed depending on the user, and even with the same exercise, fluctuations in blood pressure and changes in blood flow are not constant by the user, Unless the pulse measurement conditions were set differently for each user, it was considered difficult to perform stable pulse measurement during exercise.

  An object of the present invention is to provide a pulse measuring device capable of stably measuring a pulse even during exercise.

In order to achieve the above object, the invention according to claim 1
A pulse detection unit that is formed in a convex shape and optically detects a pulse is disposed in a state where the pulse detection unit protrudes from one surface of the apparatus main body, and the pulse detection unit is brought into contact with the skin surface to detect the pulse. In a pulse measuring device that performs measurement,
A protrusion amount changing means capable of electrically increasing or decreasing the protrusion amount of the pulse detection unit;
Acceleration detection means for detecting acceleration;
A data table for storing the amount of protrusion of the pulse detector corresponding to the pulse rate and the acceleration level;
Control means for performing change control of the protrusion amount of the pulse detection unit by the protrusion output changing means,
The data table is divided into a plurality of storage areas by a division by pulse rate and a division by acceleration level representing a temporal average of acceleration,
The control means includes
When the pulse rate can be measured based on the detection of the pulse detection unit, the current protrusion of the pulse detection unit is stored in the storage area of the data table corresponding to the pulse rate and the acceleration level based on the detection of the acceleration detection means. Store data showing quantity,
When measurement of the pulse rate becomes impossible based on the detection of the pulse detection unit, the storage area of the data table corresponding to the latest measured pulse rate and the most recently measured acceleration level is confirmed. And when the data which show the said protrusion amount are stored, the data of this protrusion amount are read, and the protrusion amount of the said pulse detection part is united with this by the said protrusion amount change means.

The invention according to claim 2 is the pulse measuring device according to claim 1,
The control means includes
In the case where the measurement of the pulse rate is disabled based on the detection of the pulse detection unit, in the storage area of the data table corresponding to the pulse rate measured most recently and the acceleration level measured most recently, When the protrusion amount data is not stored,
By sequentially shifting the pulse rate classification and acceleration level classification of the data table in the direction in which the value increases, the storage area in which the protrusion amount data is stored is searched,
When a storage area in which data is stored is found, the protrusion amount data is read out, and the protrusion amount of the pulse detection unit is adjusted by the protrusion amount changing means.

The invention according to claim 3 is the pulse measuring device according to claim 1 or 2,
The control means includes
When the pulse rate cannot be measured based on the detection of the pulse detection unit, and the pulse rate measured most recently is unknown, the protrusion amount of the pulse detection unit is increased by the protrusion amount changing means. It is characterized by searching the amount of protrusion which makes it possible to detect the pulse.

  According to the present invention, according to the measured acceleration level and pulse rate, data indicating the amount of protrusion of the pulse detector that can detect the pulse is registered in the data table. By adjusting the protrusion amount of the pulse detection unit, there is an effect that the pulse can be stably measured even during exercise under conditions suitable for the user.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an internal configuration of a pulse measuring device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an internal mechanism of the pulse measuring device, and FIG. It is a disassembled perspective view which shows the protrusion amount change mechanism to be made.

  The pulse measuring device 1 of this embodiment is a wristwatch-type measuring device that performs pulse measurement on the wrist A, and as shown in FIG. 1, a display unit 5a that performs various displays relating to pulse measurement, and a display unit Provided in a display drive driver 41 for driving 5a, a sound report unit 42 for outputting sound, a temperature detection unit 43 such as a thermistor for detecting temperature, and a pulse detection unit 6 (see FIG. 2) described later. Optical element section (light emitting element 6a and light receiving element 6b), optical detection control section 44 for performing drive control of the light emitting element 6a and signal input processing from the light receiving element 6b, and a motor for increasing or decreasing the protrusion amount of the pulse detecting section 6. 53, a rotation amount detection unit 30 such as an encoder that detects an increase / decrease amount of the protrusion amount of the pulse detection unit 6 (for example, a rotation amount of the drive gear 53a), and a convex amount control unit 52 that servo-controls the motor 53. . In addition, a control unit 45 such as a microcomputer that performs overall control of the apparatus by executing a control program, a ROM (Read Only Memory) 46 that stores control data and a control program, and a working memory in the control unit 45 A RAM (Random Access Memory) 47 as storage means for providing a space, a key input unit 48 that has a plurality of operation keys (not shown) around the display unit 5a, for example, and inputs an operation command from a user, a counter And a clock circuit 51 for measuring time, an oscillator 49 and a frequency dividing circuit 50 for supplying a clock signal having a predetermined frequency to the clock circuit, and an acceleration detection unit 56 for detecting acceleration. Among the above configurations, the motor 53, the rotation amount detection unit 30 and the convex amount control unit 52 constitute a protrusion amount changing unit, the acceleration detection unit 56 constitutes an acceleration detection unit, and the control unit 45 constitutes a control unit. Yes.

  As shown in FIG. 2, the pulse measuring device 1 includes a main body 1a on which each functional configuration of the device is mounted, and a band that is connected to a band connecting portion 9 of the main body 1a and is wound around a wrist A of a person. 2. The main body 1a is equipped with the above-described configurations and the battery 55 for supplying electric power, and a pulse detection unit 6 disposed in a protruding state on the lower surface side. In addition, a protrusion amount changing mechanism 20 that changes the protrusion amount of the pulse detector 6 is also provided.

  The pulse detection unit 6 includes a light-transmitting member 6c having a convex shape, a light-emitting element 6a such as a light-emitting diode provided inside the light-transmitting member 6c, a photodiode provided inside the light-transmitting member 6c, and the like. The light receiving element 6b and the like.

  As shown in FIG. 3, the protrusion amount changing mechanism 20 includes an adjustment plate 8 in which a hole 8 a for exposing the pulse detection unit 6 is formed, and a plurality of screw members fixed to the main body 1 a in a state where the shaft can rotate. 24, 24, drive gears 53a, 53a for rotationally driving the screw members 24, 24, and a plurality of cylindrical portions 23, 23 provided on the adjustment plate 8 at positions corresponding to the screw members 24, 24. The Pinion gears 24a and 24a meshing with the drive gears 53a and 53a are provided on the upper side of the screw members 24 and 24, and male screws 24b and 24b are provided on the lower side of the screw members 24 and 24. Further, female screws 23a and 23a that are screwed into the male screws 24b and 24b are formed inside the cylindrical portions 23 and 23, respectively. Then, the drive gears 53a and 53 are rotationally driven by the motor 53, whereby the screw members 24 and 24 are axially rotated, whereby the male screws 24b and 24b and the female screws 23a and 23a are screwed together so that the adjustment plate 8 is moved up and down. It is designed to be displaced.

  While the pulse detection unit 6 is fixed to the back window 4 of the main body 1a, the pulse detection unit 6 is displaced in the vertical direction with respect to the back window 4 of the main body 1a, so that the pulse detection unit 6 has a hole 8a in the adjustment plate 8. The amount projecting from is increased or decreased. Since the adjusting plate 8 is always in contact with the surface H of the wrist, the amount of biting into the skin of the pulse detecting unit 6 becomes deeper or shallower due to the displacement of the adjusting plate 8. In addition, since the displacement amount of the adjustment plate 8 is less than about 1 cm, the pressure of the band 2 does not change so much due to the displacement of the adjustment plate 8.

  Here, the principle of optical pulse detection will be described.

  FIG. 4 and FIG. 5 are diagrams for explaining the difference in the action of pulse detection when the amount of protrusion of the pulse detection unit 6 is small and when it is appropriate.

  Below the skin H of the wrist A, there is a capillary tissue F1 in the surface layer portion, and there are arteriole and venule tissue F2 below it. Capillary blood has a slow blood flow velocity and almost no blood pressure or pulsation, whereas arteriole blood does not lose blood pressure, and the volume change of the blood vessel is relatively large during pulsation. As shown in FIG. 4, in a state where the pulse detector 6 does not bite into the skin, the light of the light emitting element 6a is reflected by the blood of the capillary tissue F1, and does not easily reach the venule or the arteriole tissue F2. For this reason, the signal from the light receiving element 6b does not include many signals representing pulsation. In addition, a change in the volume of the blood vessel resulting from the movement of the body becomes noise and tends to appear in the signal.

  On the other hand, as shown in FIG. 5, in a state where the pulse detection unit 6 bites into the skin, the capillary tissue F1 is pushed and the blood is pushed away to the surroundings. In the arteriole or venule tissue F2, blood is pushed away by being pushed by the bite of the pulse detector 6, but at the time of pulsation, blood flows into the arteriole to increase its volume. To do. Therefore, when the pressure of the pulse detector 6 is moderate, the light from the light emitting element 6a reaches the venule and the arteriole tissue F2 well, and the volume change of the arteriole due to the pulsation greatly occurs (as shown in FIG. 5). The artery is indicated by the symbol J2), and this is the amount of reflected light and often appears in the detection signal of the light receiving element 6b. Moreover, the noise resulting from the movement of the body is also relatively reduced.

  On the other hand, if the pulse detector 6 is bitten too much and the tissue F2 of the arteriole or venule is pressed with a force stronger than the blood pressure of the arteriole, the volume change of the arteriole J2 due to pulsation does not occur much. It is considered that the signal intensity representing pulsation is relatively lowered.

  Therefore, when the body motion is small, such as at rest, the pulse can be detected even when the amount of protrusion of the pulse detection unit 6 is small. However, when the body motion becomes large, such as during physical exercise, the amount of noise caused by the body motion is increased. If the amount of protrusion of the pulse detector 6 is not optimal, the pulse detection is difficult. For example, the blood flow volume of arterioles and venules increases during physical exercise, and this is an advantageous condition for pulse detection. On the other hand, volume changes due to body movements occur in venule blood vessels during non-arteries, This is thought to appear as noise. Therefore, if the amount of protrusion can be adjusted to such an extent that blood of arterioles at the time of non-arteries can be appropriately excluded from the measurement site, it is considered that pulse detection can be performed stably.

  FIG. 6 shows a memory configuration diagram showing a part of data items stored in the RAM 46.

  In the RAM 46 in FIG. 1, a plurality of storage units 471 to 479 for storing various data are constructed in order to measure a pulse or adjust the pulse detection unit 6 to an appropriate protrusion amount during exercise. The For example, the pulse rate measurement time counter storage unit 471 for measuring the elapsed time at the time of pulse rate measurement, the current convex amount temporary storage unit 472 for temporarily storing the protrusion amount of the current pulse detection unit 6, and the pulse detection unit 6 Projection amount adjustment width storage unit 473 for storing the fluctuation range when the projection amount is increased stepwise, and the target value to which the projection amount is displaced when changing the projection amount of the pulse detection unit 6 Is a convex amount adjustment target value storage unit 474 that stores the residual amount between the target value and the current protrusion amount, and a residual amount sign (positive or negative direction). Is stored in the convex amount adjustment target residual ± storage unit 476, an acceleration detection time counter storage unit 477 that counts the acceleration detection time to calculate the time average (time average level) of acceleration, and a fixed time N detected acceleration values are stored. Acceleration value storage unit 478, acceleration range calculation result storage unit 479 that stores the calculation result of the acceleration range that is the time average classification of acceleration, and counter storage unit 480 that counts the processing time for adjusting the protrusion amount of the pulse detection unit 6 A convex amount storage unit 481 having N × n storage areas divided into an acceleration range and a pulse rate range, a latest range storage unit 482 for storing the most recently set acceleration range and pulse rate range, and the like. Built. Among these, the next data table DT1 is configured by the convex amount storage unit 481.

  FIG. 7 is an explanatory diagram of the data table DT1 constructed by the convex amount storage unit 481.

  The convex amount storage unit 481 constitutes the data table DT1 of FIG. The convex amount storage unit 481 is provided with N × n storage areas identified by two indexes, and among these, a level classification (referred to as an acceleration range) indicating the time average of acceleration is indicated by the first index. The second index indicates the pulse rate classification (referred to as pulse rate range). Each storage area stores data indicating the amount of protrusion of the pulse detector 6 when the pulse rate can be measured, corresponding to the acceleration range and the pulse rate range. That is, when certain convex amount data is stored in the storage areas corresponding to the first acceleration range and the first pulse rate range, the time average of acceleration of the pulse group measuring device 1 is the first acceleration. When included in the range, the pulse can be detected by the amount of protrusion of the pulse detector 6 corresponding to the convex amount data, and the pulse rate measured at that time is included in the first pulse rate range. It is shown to be included.

  The pulse rate range is, for example, 0 to 50 pulse rates per minute in the first pulse rate range, 51 to 100 times in the second pulse rate range, 101 to 150 times in the third pulse rate range, and 151 to 200 times. The fourth pulse rate range is set so that the pulse rate included in the range increases as the index number increases. Similarly, in the acceleration range, for example, the acceleration level is 0 to 25 in the first acceleration range, 26 to 50 is the second acceleration range, 51 to 75 is the third acceleration range, and 76 to 100 is the fourth acceleration unit. As the acceleration range, the acceleration level included in the section is set to increase as the index number increases.

  Further, the ROM 46 in FIG. 1 stores a pulse measurement program 461 that measures the pulse rate by adjusting the pulse detection unit 6 to an optimum protrusion amount even during exercise as a control program executed by the control unit 45. Has been.

  Next, the operation of the pulse measuring device 1 will be described.

  In the pulse measurement device 1 of this embodiment, when the user inputs a pulse measurement start command from the key input unit 48, the following pulse measurement processing is executed. That is, when the pulse measurement process is started, first, the pulse detector 6 emits light and receives reflected light to detect a pulse wave signal. Then, the pulse rate is measured. In parallel with the measurement of the pulse rate, acceleration is detected by the acceleration detection unit 56, and the time average of acceleration for each predetermined time (for example, 1 second to 10 seconds) is calculated. If the pulse rate is successfully measured, the data table DT1 in FIG. 7 corresponds to the calculated acceleration level (acceleration time average) and the measured pulse rate at that time. The data of the protrusion amount of the pulse detector 6 is stored in the storage area of the acceleration range and the pulse rate range.

  By repeating such processing, the data of the amount of protrusion of the pulse detector 6 that can detect the pulse in each motion state indicated by the user's pulse rate and acceleration level is registered in the data table DT1. It will be done.

  Further, when pulse detection becomes impossible during pulse measurement, the protrusion amount of the pulse detection unit 6 is increased by a predetermined amount, or the pulse rate immediately before the detection becomes impossible is known. Is read out from the data table DT1 and the amount of protrusion of the appropriate acceleration range and pulse rate range, and the amount of protrusion of the pulse detector 6 is adjusted to this.

  By such processing, even when the user's exercise state changes and the pulse cannot be detected, the amount of protrusion of the pulse detector 6 based on the protrusion amount data of the data table DT1 registered in the past. It is possible to continue to measure the pulse by changing the amount of protrusion to a protruding amount that allows rapid pulse detection.

  The details of the pulse measurement process will be described below based on the flowchart.

  In FIG. 8, the flowchart of the pulse measurement process performed by the control part 45 is shown.

  When the user performs key input and the pulse measurement process is started, first, the optical detection control unit 44 detects a pulse signal via the pulse detection unit 6, AD converts this detection value, and stores it in the memory. (Step S1). Further, acceleration is detected by the acceleration detector 56, and the detected value is AD converted and stored in the memory (step S2). Then, it is determined whether a predetermined time (for example, 10 seconds) for which the time average of acceleration can be calculated has elapsed (step S3), and if not, the process returns to step S1. By the loop processing of these steps S1 to S3, for example, acceleration data and pulse signal data for a predetermined time (for example, 10 seconds) are stored in the memory.

  When the predetermined time has elapsed and the process proceeds to the next step, first, an average value or integral value of acceleration is calculated based on the acceleration data for a predetermined time stored in the memory, and the calculated value is used as the current acceleration range. (Step S4). Subsequently, by referring to the pulse signal data for a predetermined time stored in the memory, the pulse rate is calculated from the time between two peaks of the pulse signal (step S5).

  Next, it is determined whether or not the pulse rate has been successfully calculated by the pulse rate calculation process in step S5 (step S6), and if successful, the process proceeds to step S10. If the pulse rate has not been successfully calculated because, for example, cannot be obtained, the process proceeds to step S7.

  As a result, when the calculation of the pulse rate is successful and the process proceeds to step S10, the pulse rate is displayed on the display unit 59 (step S10), and the latest pulse rate indicating the pulse rate and acceleration level that have been measured most recently is displayed. The calculation data acquired in steps S4 and S5 is applied as the data and the latest acceleration level data (step S11). Then, convex amount data indicating the current protrusion amount of the pulse detecting unit 6 is stored in the storage area corresponding to the latest pulse rate data and the latest acceleration level data in the data table DT1 (step S12).

  Next, it is determined whether or not a predetermined time (for example, 1 hour) from the start of measurement to the end of measurement has elapsed (step S13). If not, the process returns to step S1 and the processing from step S1 is repeated. If the predetermined time has elapsed, an alarm sound is output and measurement completion is displayed (steps S14 and S15), and the pulse rate measurement process is terminated.

  On the other hand, if the normal pulse signal is not obtained in the determination process in step S6 and the pulse rate is not calculated successfully, the process proceeds to step S7, where the current convex amount (the amount of protrusion of the pulse detector 6) is determined. ) Is the maximum (step S7), and then it is determined whether the calculated current acceleration level exceeds the upper limit (step S8). If the convex amount is maximum or the acceleration level exceeds the upper limit, an error display is made indicating that the pulse rate cannot be measured (step S16), and the pulse rate measurement process is terminated. To do. On the other hand, if the convex amount is not the maximum and the acceleration level does not exceed the upper limit, the convex amount adjustment process (step S9) using the data table DT1 of FIG. 7 is performed, and the process from step S1 is performed again. repeat.

  Of the above-described pulse rate measurement processing, convex amount (protrusion amount of the pulse detection unit 6) data corresponding to the acceleration range and the pulse rate range is stored in the data table DT1 of FIG. 7 by repeating processing of steps S1 to S13 including step S12. Are going to be stored. In addition, when the user's motion state changes and the pulse detection becomes impossible by the iterative process including steps S7 to S9, for example, the amount of protrusion of the pulse detection unit 6 is automatically displaced and the pulse can be detected. It will be adjusted to the state.

  FIG. 9 shows a flowchart of a subroutine process of the convex amount adjustment process in step S9 of FIG.

  If it is impossible to measure the pulse and the process proceeds to this subroutine, first, the latest pulse rate data and the latest acceleration level data previously set in step S11 of FIG. 8 are referred to (step S21), and the latest pulse rate is determined. It is determined whether or not there is data (step S22). This discrimination processing is for discriminating when the shift is made to the convex amount adjustment processing in a state where the pulse rate has not been calculated from the start of measurement. If there is no latest pulse rate data, adjustment based on the data table DT1 (convex amount table) in FIG. 7 cannot be performed, so the value obtained by increasing the current pulse amount of the pulse detection unit 6 by a predetermined width is adjusted to the convex amount. As a value (step S27), the process proceeds to the subsequent step S28.

  On the other hand, if it is determined in step S22 that the latest pulse rate data is present, the pulse rate corresponding to the latest pulse rate data is determined to determine the reference position of the data table DT1 (convex amount table) in FIG. A range is determined (step S23), and then an acceleration range is determined from the latest acceleration range data (step S24). Then, the convex amount adjustment value is referred from the data table DT1 by a convex amount table reference process described later (step S25). After performing the process of referring to the convex amount adjustment value, it is confirmed whether the convex amount adjustment value has been acquired (step S26). If it has been acquired, the process proceeds to the next step S28. A value obtained by increasing the amount (the protruding amount of the pulse detecting unit 6) by a predetermined width is determined as a convex amount adjustment value (step S27), and the process proceeds to step S28.

  When the process proceeds to step S28, the convex amount control unit 52 is sequentially operated to adjust the protrusion amount of the pulse detecting unit 6 to the determined convex amount adjustment value (step S28), and the alarm sound is output (step S29). A display process (step S30) indicating the completion of one-step convex amount adjustment is performed, and the convex amount adjustment process is terminated.

  Among the processes described above, when the branch process of step S22 is shifted to the convex amount table reference process of step S25, the data table DT1 of FIG. 7 is referred to for appropriate convex amount data. On the other hand, when the branching process of step S22 is shifted to the convexity adjustment value determination process of step S27, or when appropriate convexity data cannot be obtained from the data table DT1, the protrusion amount of the pulse detector 6 is It is gradually increased. Even when appropriate convex amount data cannot be obtained from the data table DT1, the process of increasing the protrusion amount of the pulse detecting unit 6 in steps S27 and S28 and the processes of steps S1 to 5 in FIG. The amount of protrusion increases stepwise until detection is possible, and the amount of protrusion capable of detecting a pulse is searched.

  FIG. 10 is a flowchart of a subroutine process of the convex amount table reference process in step S25 of FIG. 9, and FIG. 11 is a diagram illustrating the order of storage areas in the data table DT1 referred to in the convex amount table reference process. The figure is shown.

  After shifting to the convex amount table reference process, first, data corresponding to the pulse rate range and acceleration range determined in the immediately preceding step (steps S23 and S24 in FIG. 9) from the data table DT1 (convex amount table) in FIG. Reference is made (steps S41 and S42). Then, it is confirmed whether or not there is protrusion amount data (denoted as convex amount data in the drawing) in the storage area in the data table DT1 corresponding to the pulse rate range and acceleration range (step S43).

  As a result, if there is protrusion amount data, this protrusion amount is determined as the convex amount adjustment value of the pulse detecting unit 6 that can detect the pulse in the current exercise state (step S44), and indicates that the table has been referred to. Alarm sound output and display output are performed (steps S45 and S46), and this subroutine processing is terminated.

  On the other hand, if it is determined in the determination process in step S43 that no convex amount data is stored in the designated storage area of the data table DT1, the range of the reference destination of the data table DT1 is set to 1 in steps S47 to S51. Process to change. That is, as shown in FIG. 11, when the storage area referred to immediately before (for example, area a) is not the maximum range of the acceleration range, the storage area (in which the acceleration range is increased by one without changing the pulse rate range) For example, the range is changed to the range b) (steps S47 and S48). In addition, when the storage area (for example, the area d) referred to immediately before is the maximum range of the acceleration range, the storage area (for example, the area e) in which the acceleration range is minimum and the pulse rate range is increased by one. Change (steps S47, S49 to S51).

  When the reference range is changed in this way, the process returns to step S43 again, and whether or not the protrusion amount data is registered in the storage area corresponding to the changed acceleration range and pulse rate range in the data table DT1. Is confirmed, and the processing from step S43 is repeated.

  If there is protrusion amount data that can be measured in the past in the range close to the acceleration range and the pulse rate range that have been measured most recently by the repetition processing of steps S43 and S47 to S51, the protrusion amount data is It is read from the data table DT1.

  That is, as shown in FIG. 11, the protrusion amount data is not registered in the storage area a corresponding to the acceleration range and the pulse rate range set in the immediate vicinity of the data table DT1, and the protrusion amount data is registered in the other storage area f. In such a case, the storage area a → b → c → d → e → f and the reference area are changed by repeating the range changing process in steps S43 and S47 to S49, and the protrusion amount data The registered storage area f is reached. The protrusion amount data is read from the storage area f.

  On the other hand, if the reference range of the data table DT1 is the maximum for both the pulse rate range and the acceleration range, the process proceeds to step S52 in the discrimination process of steps S47 and S49, and the range cannot be changed. “NULL” data indicating that there is no value as a convex amount adjustment value is substituted (step S52). Then, an alarm sound indicating the completion of the table reference and a display output are performed (steps S45 and S46), and this subroutine processing is terminated.

  Then, in the convex amount adjustment process of FIG. 9 described above, the protrusion amount of the pulse detector 6 is changed based on the read protrusion amount data, and the pulse measurement can be performed again. If it is impossible, the same process is repeated again, and the amount of protrusion of the pulse detector 6 is adjusted to a state where the pulse can be measured quickly.

  As described above, according to the pulse measurement device 1 of the present embodiment, the point where the strength of body motion generated by physical movement appears as an acceleration level, and the pulse rate changes as the exercise continues. By utilizing the fact that the amount of protrusion of the pulse detector 6 that is optimal for pulse detection changes due to changes in blood flow and blood pressure on the body surface layer, the amount of protrusion of the pulse detector 6 depends on the acceleration level and the pulse rate. By automatically adjusting the amount, it is possible to continuously measure the pulse even during various physical movements.

  Moreover, since the data of the protrusion amount of the pulse detection unit 6 is repeatedly measured by the user, the protrusion amount data corresponding to the user is registered in the data table. Even if the pulsation state is different for each user even if the same exercise is performed, an adjustment suitable for each user is performed.

  In addition, when the data of the protrusion amount corresponding to the current situation is not registered in the data table, the protrusion amount data of the situation close to the current situation is read, or the pulse rate is not yet measured. If the data table cannot be referred to, the amount of protrusion of the pulse detection unit 6 is changed step by step so as to find a place where pulse measurement is possible, so that the body movement is not performed in the middle stage, It is possible to perform pulse measurement during various physical exercises.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the acceleration level may be a value obtained by sampling a signal representing acceleration and averaging the sampling data for a predetermined time, or sampling an acceleration signal and extracting a plurality of peak values thereof. An average value may be used. Further, the range width of the acceleration range and the pulse rate range in the data table DT1 can be changed to an appropriate value, and a small range width is set in the center range, and a large range width is set in the range close to the upper limit and the lower limit. For example, the width of each range may be set differently.

  In the above embodiment, the pulse rate measured during the pulse rate measurement process has been described as being displayed and output. However, a large number of measured pulse rates are stored as a history with time so that they can be read later. It is good also as a simple structure. In addition, a structure in which the pulse detection unit 6 itself is displaced may be employed as a mechanism for providing the display unit separately from the apparatus or increasing or decreasing the amount of protrusion of the pulse detection unit 6. In addition, the details and the like shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

It is a block diagram which shows the internal structure of the pulse measuring device of embodiment of this invention. It is sectional drawing which shows the internal mechanism of a pulse measuring device. It is a disassembled perspective view which shows the mechanism which changes the protrusion amount of a pulse detection part. It is a figure explaining the detection operation of a pulse in the state where the amount of projections of a pulse detection part is small. It is a figure explaining the detection operation | movement of a pulse in the state with the optimal protrusion amount of a pulse detection part. It is a memory block diagram which shows a part of data content stored in RAM of FIG. It is a figure which shows the data table in which the protrusion amount data of a pulse detection part are stored in each division of a pulse rate and acceleration. It is a flowchart which shows the process sequence of the pulse measurement process performed by a control part. It is a flowchart which shows the subroutine process of the convex amount adjustment process of step S4 of FIG. It is a flowchart which shows the subroutine process of the convex amount table reference process of step S25 of FIG. It is explanatory drawing which shows the order of the memory area of the data table referred by convex amount table reference processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulse measuring device 1a Main body part 2 Band 5a Display part 6 Pulse detection part 6a Light emitting element 6b Light receiving element 6c Translucent member 20 Projection amount change mechanism 30 Rotation amount detection part 42 Sound report part 43 Temperature detection part 45 Control part 46 ROM
47 RAM
48 Key input section 53 Motor 55 Battery 56 Acceleration detection section

Claims (3)

A pulse detection unit that is formed in a convex shape and optically detects a pulse is disposed in a state where the pulse detection unit protrudes from one surface of the apparatus main body, and the pulse detection unit is brought into contact with the skin surface to detect the pulse. In a pulse measuring device that performs measurement,
A protrusion amount changing means capable of electrically increasing or decreasing the protrusion amount of the pulse detection unit;
Acceleration detection means for detecting acceleration;
A data table for storing the amount of protrusion of the pulse detector corresponding to the pulse rate and the acceleration level;
Control means for performing change control of the protrusion amount of the pulse detection unit by the protrusion output changing means,
The data table is divided into a plurality of storage areas by a division by pulse rate and a division by acceleration level representing a temporal average of acceleration,
The control means includes
When the pulse rate can be measured based on the detection of the pulse detection unit, the current protrusion of the pulse detection unit is stored in the storage area of the data table corresponding to the pulse rate and the acceleration level based on the detection of the acceleration detection means. Store data showing quantity,
When measurement of the pulse rate becomes impossible based on the detection of the pulse detection unit, the storage area of the data table corresponding to the latest measured pulse rate and the most recently measured acceleration level is confirmed. When the data indicating the protrusion amount is stored, the protrusion amount data is read out, and the protrusion amount of the pulse detector is adjusted to the protrusion amount by the protrusion amount changing means. . The control means includes
In the case where the measurement of the pulse rate is disabled based on the detection of the pulse detection unit, in the storage area of the data table corresponding to the pulse rate measured most recently and the acceleration level measured most recently, When the protrusion amount data is not stored,
By sequentially shifting the pulse rate classification and acceleration level classification of the data table in the direction in which the value increases, the storage area in which the protrusion amount data is stored is searched,
2. The pulse measurement according to claim 1, wherein when the storage area in which data is stored is found, the protrusion amount data is read out, and the protrusion amount of the pulse detecting unit is adjusted to the protrusion amount by the protrusion amount changing means. apparatus. The control means includes
When the pulse rate cannot be measured based on the detection of the pulse detection unit, and the pulse rate measured most recently is unknown, the protrusion amount of the pulse detection unit is increased by the protrusion amount changing means. The pulse measurement device according to claim 1, wherein a protrusion amount that enables detection of a pulse is searched for.

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