JP2008168051A - Heartbeat meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heartbeat meter which is ear fixed type and fittable to any ears and allows accurate measurement of heartbeat. <P>SOLUTION: The heartbeat meter comprises a body 1 which a user hangs from the neck and an ear installment 3 which comprises a first arm 11 having a stopper 14 clamping an earlobe 102 and a detector 15 for detecting a pulse wave, a second arm 12 having an earphone 13 for outputting a voice, and a spindle 55 connecting the arms. The first arm 11 is mounted rotatably on the spindle 55 both clockwise and counterclockwise against the second arm 12; and the earphone 13 outputs a voice corresponding to a heartbeat count to accord to the signal of the pulse wave detected by the detector 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heart rate monitor, and more particularly to a heart rate monitor that obtains a heart rate by detecting a pulse wave with an earlobe.

  Conventionally, as a device for detecting a pulse wave with an earlobe, the following pulse meter is known. In this pulse meter, a light source, a photoelectric element, and an earphone, which are arranged so as to face each other across the earlobe, are attached to one ear ring, and through the earlobe from the light source, enter the photoelectric element. A signal processing circuit for transmitting an audible frequency signal having a pitch corresponding to the pulsation period of the output transmitted from the photoelectric element by light is provided, and the output of the signal processing circuit is added to the earphone (for example, , See Patent Document 1).

  Further, in the pulse ear sensor for measuring the pulse of the subject, the pulse detection unit has a pulse detection unit that obtains a pulse detection signal based on the transmittance or reflectance of the light applied to the subject's earlobe. A pulse ear sensor characterized in that it includes a pinching portion that sandwiches the earlobe and a protrusion that is connected to the pinching portion. In this pulse ear sensor, the protrusion is an end of the pinching portion, and when the earlobe is pinched by the pinching portion, a portion directly above the earlobe and facing the lower portion of the concha cavity entrance, the concha It is provided at a part facing the cavity entrance or a part facing the upper part of the concha cavity entrance (for example, see Patent Document 2).

Japanese Examined Patent Publication No. 61-43057 (Claims) JP 2002-360529 A (Claims 1 to 4)

  However, in the pulsometer disclosed in Patent Literature 1, the size and shape of the ear ring are different from person to person because the size of the part (the ear ring) on which the ear ring is hung and the manner of bending differ from person to person. Does not fit. Therefore, there is a problem in that a feeling of discomfort may be felt when wearing the pulse meter. In addition, in order for all people to be able to use this pulse meter comfortably, there is a problem that it is necessary to prepare an ear ring of various sizes depending on the size of the ear ring.

  In addition, in Patent Document 2, as described above, three types of lengths are disclosed as the distance from the projecting portion to the sandwiching portion depending on the position of the projecting portion with respect to the concha cavity entrance. Again, the distance is fixed. Therefore, there is a problem that only a person having an ear that exactly matches this distance can comfortably use the pulse ear sensor. In addition, if the distance from the protrusion to the clamping part does not match the ear, it is impossible to effectively suppress the shaking of the earlobe, so the pulse waveform is distorted and the pulse measurement cannot be performed accurately. There is.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an ear-mounted heart rate monitor that can be worn according to the ears of everyone in order to eliminate the above-described problems caused by the prior art. Another object of the present invention is to provide a heart rate monitor that can accurately measure the heart rate.

  In order to solve the above-described problems and achieve the object, a heart rate monitor according to the invention of claim 1 includes a first arm having a sandwiching portion and a detection unit for detecting a pulse wave provided in the sandwiching portion, and an earphone unit. A heart rate monitor having a second arm having a first arm, wherein the first arm is rotatably supported with respect to the second arm.

  According to a second aspect of the present invention, there is provided a heart rate monitor according to the first aspect of the present invention, further comprising a heart rate counting unit that calculates a heart rate based on the pulse wave detected by the detection unit, and the earphone. The unit reports guidance according to the heart rate calculated by the heart rate counting unit.

  According to a third aspect of the present invention, there is provided a heart rate monitor according to the first or second aspect, wherein the first arm has a fixed piece connected to the second arm and an earlobe between the fixed piece. The detection part is composed of a light emitting element part and a light receiving element part that receives light emitted from the light emitting element part, and emits light to one of the fixed piece and the movable piece. A light receiving element portion is provided, and a light receiving element portion for receiving light emitted from the light emitting element portion is provided on the other side, and the light covering the window portion in which the light emitting element portion and the light receiving element portion are respectively disposed. The permeable protective sheet is characterized by being bent so as to protrude outward.

  According to a fourth aspect of the present invention, in the heart rate monitor according to the first or second aspect, an angle formed between the extending direction of the first arm and the extending direction of the second arm is 150 degrees or more and 180 degrees. It is characterized by being less than or equal to degrees.

  According to a fifth aspect of the present invention, in the heart rate monitor according to the first or second aspect of the invention, the first arm has a fixed piece connected to the second arm and an earlobe between the fixed piece. It is characterized by comprising a movable piece that is sandwiched by elastic return force, and the support shaft portion is inclined with respect to the surface of the fixed piece that contacts the earlobe.

  According to a sixth aspect of the present invention, in the heart rate monitor according to the fifth aspect, the angle formed by the extending direction of the support shaft portion and the normal direction of the surface of the fixed piece that contacts the earlobe is , Not less than 0 degrees and not more than 30 degrees.

  According to the present invention, the earphone part is attached to the ear hole, and in this state, the first arm is rotated with respect to the second arm, and the earlobe is sandwiched between the fastening parts, whereby the distance from the earphone part to the detection part is increased. The distance from the user's ear hole to the earlobe can be exactly matched. Therefore, the heart rate monitor can be worn according to the user's ear. Thereby, since the heart rate monitor is stably worn on the ear, the noise when detecting the pulse wave is reduced.

  Further, according to the present invention, the protective sheet that protects the light emitting element portion and the light receiving element portion protrudes to the outside, so that those element portions can be attached to the outer position without interfering with the protective sheet. . Therefore, the light emitting element portion and the light receiving element portion are in close contact with the earlobe, and the sensitivity of pulse wave detection is improved and the influence of external light is less likely to be detected, so that the pulse wave can be detected more accurately.

  Further, according to the present invention, the earphone unit outputs a sound corresponding to the heart rate, so that the user can check whether the heart rate is in an appropriate range without visually checking the display of the heart rate. I can know. Further, since the first arm is inclined with respect to the second arm, the ergonomically preferable shape is obtained, and thus the wearing feeling of the heart rate monitor is improved.

  The heart rate monitor according to the present invention has an effect that it can be worn according to the ears of all people. In addition, there is an effect that the heartbeat can be accurately measured.

  Exemplary embodiments of a heart rate monitor according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is an external view for explaining the overall configuration of a heart rate monitor according to an embodiment of the present invention. As shown in FIG. 1, the heart rate monitor includes a main body unit 1, a strap 2 for hanging the main body unit 1 from the user's neck, and an ear wearing unit 3. Although the detailed configuration of the ear mounting unit 3 will be described later, the ear mounting unit 3 is provided with a fastening unit that sandwiches the earlobe, a detection unit that detects a pulse wave, and an earphone unit that outputs sound.

  The ear wearing part 3 is electrically connected to the main body part 1 by a signal line 4. A portion of the signal line 4 on the main body 1 side is passed through the inside of the strap 2, folded back by a drawer member 5 fixed in the middle of the strap 2, and pulled out of the strap 2. The portion of the signal line 4 that extends outside the strap 2 is connected to the ear mounting portion 3 through a length adjusting ring member 6 that can be slid with respect to the strap 2. .

  The main body 1 includes, for example, a dial type operation unit 7 that is operated by a user when the power is turned on or off or an operation mode is selected. Further, the main body 1 incorporates a processing circuit (not shown in the figure) for obtaining a heart rate based on a pulse wave detection signal sent from the ear wearing part 3 via the signal line 4.

  The main unit 1 also includes a display unit 8 that displays the heart rate obtained by the processing circuit. The display unit 8 is not particularly limited. For example, the display unit 8 is configured such that numbers, characters, symbols (including pictographs), and the like representing the heart rate appear only when the power is on.

  2 and 3 are front views for explaining a state in which the ear mounting portion is mounted on the ear. In these drawings, reference numerals 11 and 12 denote a first arm and a second arm constituting the ear mounting portion 3, respectively. As shown in these drawings, the ear mounting part 3 has the earphone part 13 of the second arm 12 inserted into the concha 101 of the ear 100 and the fastening part 14 of the first arm 11 sandwiches the earlobe 102. Is attached to the ear 100.

  A detection unit 15 that detects a pulse wave is provided at a portion of the fastening unit 14 that sandwiches the earlobe 102. The 1st arm 11 and the 2nd arm 12 are connected via the spindle part which does not appear in a figure. The first arm 11 is attached to the second arm 12 so as to be rotatable in both clockwise and counterclockwise directions around the support shaft portion.

  When the distance from the ear hole (not visible behind the earphone unit 13) to the earlobe 102 is short, as shown in FIG. 2, the angle between the first arm 11 and the second arm 12 is brought close to 90 degrees, The distance from the earphone part 13 to the detection part 15 becomes short. On the other hand, when the distance from the ear hole to the earlobe 102 is long, as shown in FIG. 3, the angle between the first arm 11 and the second arm 12 is brought close to 180 degrees to thereby detect the detection unit from the earphone unit 13. The distance up to 15 becomes longer.

  Next, a detailed configuration of the ear wearing unit 3 will be described. 4 and 5 are an exploded perspective view and a sectional view, respectively, for explaining the configuration of the ear mounting portion, and FIG. 6 is a view for explaining the rotation mechanism of the ear mounting portion. 4 and 5, the signal line 4 is omitted inside and outside the ear wearing portion 3.

  As shown in these drawings, the first arm 11 includes a fixed piece frame portion 21, a light receiving element portion 22, a fixed piece lid portion 23, a light receiving element protection sheet 24 and a rubber pad 25, and a movable piece frame portion. 31, a light-emitting element portion 32, a movable piece lid portion 33, a light-emitting element protection sheet 34, and a movable piece 17 composed of a rubber pad 35, and a hinge portion 41 that connects the fixed piece 16 and the movable piece 17 so that they can be opened and closed like a sag. The spring piece 42 is provided.

  The light emitting element unit 32 and the light receiving element unit 22 constitute the detection unit 15. The fixed piece 16 and the movable piece 17 constitute the fastening portion 14. The second arm 12 includes an arm main body 51, an arm lid 52, a speaker 53 of the earphone unit 13, and a rubber pad 54. The arm body 51 is provided with the support shaft 55 that connects the first arm 11 and the second arm 12. An O-ring 61 and a shaft retaining ring 62 are attached to the support shaft portion 55.

  The second arm 12 is assembled as follows. The arm body 51 is molded into a bent shape. The support shaft portion 55 projects from one end of the arm main body portion 51. The speaker 53 is attached to the opening at the other end of the arm main body 51. A signal line (not shown) extending from the speaker 53 is passed through a cavity in the arm main body 51 and drawn out from an end on the support shaft 55 side. The outer peripheral portion of the speaker 53 is covered with the rubber pad 54 in order to enhance the wearing feeling with respect to the concha 101 (see FIG. 2).

  The arm lid 52 is attached to the arm main body 51. The support shaft portion 55 penetrates the fixed piece frame portion 21 constituting the fixed piece 16 of the first arm 11. Then, an O-ring 61 is fitted from the back side of the fixed piece frame portion 21 to the tip end portion of the support shaft portion 55 protruding to the back side of the fixed piece frame portion 21, and a shaft retaining ring 62 is further fitted. An outward flange portion 56 is provided at a part of the outer peripheral portion of the distal end portion of the support shaft portion 55. A notch 57 is partially formed at the lower end of the flange 56.

  The notch 57 is formed to insert a tongue piece 63 (to be described later) of the shaft retaining ring 62. The tongue 63 of the shaft retaining ring 62 is provided so as to protrude inward from a part of the inner peripheral portion. A portion of the support shaft portion 55 without the flange portion 56 serves as an escape portion 58 for escaping the tongue piece 63 of the shaft retaining ring 62 during assembly. Therefore, the escape portion 58 is wider than the tongue piece 63.

  When assembling, the support shaft portion 55 is inserted into the through hole of the fixed piece frame portion 21 from the front side of the fixed piece frame portion 21 (the lower side in the drawings in FIGS. 4 to 6), and the back side of the fixed piece frame portion 21. The O-ring 61 is fitted to the distal end portion of the support shaft portion 55 from the upper side in FIGS. 4 to 6. Further, the shaft retaining ring 62 is fitted to the support shaft portion 55 by aligning the tongue piece 63 of the shaft retaining ring 62 with the relief portion 58 of the flange portion 56 of the support shaft portion 55.

  Then, the shaft retaining ring 62 is rotated about 90 degrees so that the tongue piece 63 passes under the flange portion 56, and the tongue piece 63 is fitted into the notch portion 57 of the flange portion 56. In this way, the first arm 11 can be rotated with respect to the second arm 12, and the arm main body 51 of the second arm 12 is prevented from being detached from the fixed piece frame 21 of the first arm 11. The first arm 11 and the second arm 12 are connected to each other.

  The O-ring 61 is in contact with both the fixed piece frame portion 21 and the shaft retaining ring 62. The O-ring 61 is made of a material having a large friction coefficient with respect to both the fixed piece frame portion 21 and the shaft retaining ring 62, for example, polyurethane. When the first arm 11 is rotated with respect to the second arm 12 by the frictional resistance between the O-ring 61 and the fixed piece frame portion 21 and the frictional resistance between the O-ring 61 and the shaft retaining ring 62, The first arm 11 can be stopped in a state where the first arm 11 is rotated at an arbitrary angle with respect to the two arms 12.

  In the first arm 11, the fixed piece 16 is assembled as follows. The fixed piece lid portion 23 is opposed to the movable piece lid portion 33 of the movable piece 17. The fixed piece lid portion 23 is provided with a window portion 26 that opens to face the movable piece lid portion 33. The light receiving element portion 22 is arranged facing the window portion 26 in a space formed by combining the fixed piece frame portion 21 and the fixed piece lid portion 23.

  The window portion 26 is closed with a light-transmitting light-receiving element protection sheet 24. The light receiving element protection sheet 24 is bent so as to protrude toward the movable piece lid 33 side. The light receiving element portion 22 is disposed so as to protrude from the fixed piece lid portion 23 toward the movable piece lid portion 33 by the amount of the protrusion of the light receiving element protection sheet 24. The outer peripheral portion of the light receiving element protection sheet 24 is covered with the rubber pad 25 in order to enhance the feeling of mounting on the earlobe 102 (see FIG. 2).

  In the first arm 11, the movable piece 17 is assembled as follows. The movable piece lid portion 33 is provided with a window portion 36 that opens to face the light receiving element portion 22 on the fixed piece 16 side. The light emitting element portion 32 is disposed facing the window portion 36 in a space formed by combining the movable piece frame portion 31 and the movable piece lid portion 33.

  The window 36 is closed with a light-transmitting light-emitting element protection sheet 34. The light emitting element protection sheet 34 is bent so as to protrude toward the fixed piece lid portion 23. The light emitting element portion 32 is arranged so as to protrude from the movable piece lid portion 33 toward the fixed piece lid portion 23 by the amount of the protrusion of the light emitting element protection sheet 34. The outer peripheral portion of the light emitting element protection sheet 34 is covered with the rubber pad 35 in order to enhance the feeling of wearing on the earlobe 102 (see FIG. 2).

  The hinge portion 41 is provided with a support shaft 43 and an attachment groove portion 44. The support shaft 43 is supported by a bearing portion 27 formed by combining the fixed piece frame portion 21 of the fixed piece 16 and the fixed piece lid portion 23. In this bearing portion 27, the support shaft 43 is sandwiched between the fixed piece frame portion 21 and the fixed piece lid portion 23, so that it does not come out of the bearing portion 27.

  On the other hand, the movable piece 17 is fixed to the hinge portion 41 by inserting one end thereof into the attachment groove portion 44 of the hinge portion 41. A spring piece 42 is put on the support shaft 43. The movable piece 17 is biased toward the fixed piece 16 by the elastic restoring force of the spring piece 42. That is, the fastening portion 14 constituted by the fixed piece 16 and the movable piece 17 sandwiches the earlobe 102 with an appropriate force.

  A signal line (not shown) extending from the light receiving element portion 22 is passed through a hollow portion in the fixed piece 16 formed by combining the fixed piece frame portion 21 and the fixed piece lid portion 23, and a hollow in the support shaft portion 55 of the second arm 12. And the hollow portion in the arm main body 51, and is pulled out from the end on the support shaft 55 side. In addition, a signal line (not shown) extending from the light emitting element portion 32 is passed through a hollow portion in the movable piece 17 formed by combining the movable piece frame portion 31 and the movable piece lid portion 33, and passes through a hollow portion in the hinge portion 41. It is guided to the cavity portion in the fixed piece 16 and further drawn out from the end portion on the support shaft portion 55 side through the cavity portion in the support shaft portion 55 and the cavity portion in the arm main body portion 51.

  Here, in order to further enhance the wearing feeling with respect to the ear 100 (see FIG. 2), the shape of the ear mounting part 3 is based on the positional relationship between the concha 101 and the earlobe 102 of the actual ear 100 based on ergonomics. Designed to fit. Specifically, as shown in FIG. 5, the direction AA in which the first arm 11 extends and the direction BB in which the second arm 12 extends form a predetermined angle. The predetermined angle is an angle between 150 degrees and 180 degrees.

  In order to realize this, in this embodiment, the support shaft portion 55 is designed to be inclined with respect to the surface of the fixed piece 16 that contacts the earlobe 102, that is, the surface of the rubber pad 25. As shown in FIG. 5, the direction C-C in which the support shaft portion 55 extends and the normal direction DD on the surface of the rubber pad 25 form an angle of 0 degree to 30 degrees.

  FIG. 7 is a block diagram illustrating the configuration of the signal processing system of the heart rate monitor. As shown in FIG. 7, the heart rate monitor according to the embodiment includes a detection unit 15 that acquires heart rate information from the earlobe 102, a detection circuit 71 that forms a detection signal from the output of the detection unit 15, and detection from the detection circuit 71. A signal processing unit 72 that detects a heartbeat by performing signal processing on the signal, a heart rate counting unit 73 that counts heartbeats, a display unit 8 that notifies the counted heart rate, and an earphone unit 13 are provided.

  The detection unit 15 includes a light emitting element unit 32 that irradiates light to the earlobe 102 and a light receiving element unit 22 that receives the light transmitted through the earlobe 102. The light emitting element unit 32 is driven by the light emitting circuit unit 74. The light emitted from the light emitting element unit 32 to the earlobe 102 is scattered by the tissue in the earlobe 102 and the blood in the blood vessel and is emitted out of the earlobe 102 again. The intensity of the light emitted from the earlobe 102 varies according to the blood flow. The heart rate monitor of the embodiment detects a heart rate based on a change in light intensity that varies according to the blood flow.

  The detection circuit 71 includes a light receiving circuit unit 75 that converts the electrical signal photoelectrically converted by the light receiving element unit 22 into a detection signal, an amplification circuit unit 76 that amplifies the detection signal, and the amplified signal (analog signal). An A / D converter 77 for converting into a digital signal is provided. The signal processing unit 72 performs noise removal and second harmonic signal amplification on the detection signal from the detection circuit 71 by a bandpass filter, second-order differential characteristics, and the like, and a narrowband signal processing unit 78. Is provided with a waveform distortion detector (slope detector) 79 for detecting the heartbeat by forming the waveform distortion of the heartbeat signal generated in the above.

  The heart rate counting unit 73 counts the heart rate obtained by the signal processing unit 72. The display unit 8 displays the heart rate counted by the heart rate counting unit 73. The earphone unit 13 outputs sound corresponding to the heart rate counted by the heart rate counting unit 73. For example, when the user exercises while wearing the heart rate monitor of the embodiment, the earphone unit 13 determines whether the heart rate is within an appropriate range with respect to the exercise intensity set by the user by sound. To inform.

  As described above, according to the embodiment, the earphone unit 13 is attached to the ear hole, and in this state, the first arm 11 is rotated with respect to the second arm 12 and the earlobe 102 is sandwiched by the fastening unit 14. Thus, the distance from the earphone unit 13 to the detection unit 15 can be exactly matched to the distance from the user's ear hole to the earlobe 102. Therefore, the ear mounting part 3 can be mounted according to the user's ear. Thereby, since the ear mounting part 3 is stably mounted on the ear, the noise when detecting the pulse wave is reduced.

  Further, the light receiving element protection sheet 24 and the light emitting element protection sheet 34 protrude outward, so that the light receiving element portion 22 and the light emitting element portion 32 are attached to the outer positions without interfering with the protective sheets 24 and 34. be able to. Accordingly, the light emitting element portion 32 and the light receiving element portion 22 are in close contact with the earlobe 102, the sensitivity of pulse wave detection is improved, and the influence of external light is less likely to be detected, so that the pulse wave can be detected more accurately. Can do.

  Further, the earphone unit 13 outputs a sound corresponding to the heart rate, so that the user can know whether or not the heart rate is in an appropriate range without visually confirming the display of the heart rate. Further, since the first arm 11 is inclined with respect to the second arm 12, the wearing feeling of the ear wearing portion 3 is improved. Thus, according to the embodiment, the effect that the ear mounting part 3 can be mounted in accordance with the ears of everyone and the effect that the heart rate can be accurately measured are obtained.

  As described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the light emitting element part 32 may be attached to the fixed piece 16 side, and the light receiving element part 22 may be attached to the movable piece 17 side. Further, both the light emitting element portion 32 and the light receiving element portion 22 are provided only on either the fixed piece 16 or the movable piece 17, and the light emitted from the light emitting element portion 32 is reflected by the earlobe 102 and returned. The incoming light may be received by the light receiving element portion 22. Alternatively, the light receiving element unit 22 may receive light scattered by the earlobe 102.

  In addition, assuming that the device is not used as a heart rate monitor, an earphone jack is provided in the main unit 1, a portable music playback device is connected to the earphone jack, and a music signal output from the portable music playback device is transmitted to the earphone unit 13. It is good also as a structure output from the speaker 53. FIG.

  Further, in FIG. 1, the ear mounting portion 3 is connected to only the strap 2 drawn from the left side of the main body portion 1 through the signal line 4, but the signal line is similarly pulled out from the right side of the main body portion 1. Thus, a second ear mounting portion may be prepared for the opposite ear, and the ear mounting portion may be mounted on the left and right ears so that the music signal from the portable music playback device can be enjoyed in stereo. In this case, the configuration for detecting the heart rate may be provided only in one ear mounting portion.

  As described above, the heart rate monitor according to the present invention is useful for an ear-mounted type heart rate monitor, and is particularly suitable for a heart rate monitor that measures a heart rate during exercise in order to adjust an exercise load.

It is an external view explaining the whole structure of the heart rate monitor concerning embodiment of this invention. It is a front view explaining the mounting | wearing state of the ear mounting part of the heart rate monitor concerning embodiment of this invention. It is a front view explaining the mounting | wearing state of the ear mounting part of the heart rate monitor concerning embodiment of this invention. It is a disassembled perspective view explaining the structure of the ear | edge mounting part of the heart rate monitor concerning embodiment of this invention. It is sectional drawing explaining the structure of the ear mounting part of the heart rate monitor concerning embodiment of this invention. It is a figure explaining the rotation mechanism of the ear mounting part of the heart rate monitor concerning this Embodiment. It is a block diagram explaining the structure of the signal processing system of the heart rate monitor concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st arm 12 2nd arm 13 Earphone part 14 Fastening part 15 Detection part 16 Fixed piece 17 Movable piece 22 Light receiving element part 24 Light receiving element protection sheet 26, 36 Window part 32 Light emitting element part 34 Light emitting element protection sheet 55 Support axis part 73 Heart rate counter

Claims (6)

A first arm having a sandwiching portion and a detection portion for detecting a pulse wave provided in the sandwiching portion;
In a heart rate monitor having a second arm having an earphone unit,
A heart rate monitor, wherein the first arm is pivotally supported with respect to the second arm. A heart rate counting unit that calculates a heart rate based on the pulse wave detected by the detection unit;
2. The heart rate monitor according to claim 1, wherein the earphone unit reports guidance according to a heart rate calculated by the heart rate counting unit. The first arm is composed of a fixed piece connected to the second arm, and a movable piece that sandwiches the earlobe between the fixed piece with elastic return force,
The detection unit includes a light emitting element unit and a light receiving element unit that receives light emitted from the light emitting element unit.
A light emitting element portion is provided on one of the fixed piece and the movable piece, and the light receiving element portion is provided on the other;
The heartbeat according to claim 1 or 2, wherein the light-transmitting protective sheet covering the window portion where the light emitting element portion and the light receiving element portion are respectively arranged is bent so as to protrude outward. Total.   3. The heart rate monitor according to claim 1, wherein an angle formed between a direction in which the first arm extends and a direction in which the second arm extends is 150 degrees or more and 180 degrees or less.   The first arm includes a fixed piece connected to the second arm, and a movable piece that sandwiches the earlobe between the fixed piece by elastic return force, and the support shaft portion is provided on the earlobe of the fixed piece. The heart rate monitor according to claim 1 or 2, wherein the heart rate monitor is inclined with respect to a contact surface.   6. The heart rate monitor according to claim 5, wherein an angle between a direction in which the support shaft extends and a normal direction of a surface of the fixed piece that contacts the earlobe is not less than 0 degrees and not more than 30 degrees. .

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