JP6671686B2 - Skew straightening device and skew straightening method - Google Patents

Description

  The present invention relates to a skew correction device and a skew correction method for measuring a skew of a bow held by an athlete and prompting the athlete to correct the bow.

  Conventionally, in archery competition, a sight (sight) has been used to accurately point an arrow. A competitor looks into the sight to aim at the center of the target (for example, see Non-Patent Document 1).

Hiroshi Yamamoto, "Archive from Zero of Hiroshi Yamamoto", Jitsugyo Nihonsha, 2010 Analog Devices, Inc., “AN-1057 Application Note”, 2010

  However, even if aiming with the sight, the arrow cannot fly on the axis towards the center of the target defined by the sight unless the bow is upright with respect to the ground. If the bow is tilted clockwise when viewed from the front, the arrow tends to shift to the right from the position set by the sight, and if tilted counterclockwise, the arrow tends to shift to the left. It is.

  FIG. 13 shows a bow with a sight. In FIG. 13, reference numeral 21a denotes a rim, 21b denotes a handle, and 21c denotes a sight. The components of the bow 21 such as the sight 21-1 do not have a function of grasping the inclination of the bow 21. The person cannot grasp the inclination (tilt) of his own bow 21. For this reason, there is a problem that it is necessary to have another person look and point out on the side, and it is difficult to correct it by himself, and the pointed out becomes the accuracy of eye measurement. Although there is a method of shooting a moving image and confirming it afterwards, there was a problem that real-time correction was difficult.

  The present invention has been made in order to solve such a problem, and an object thereof is to quantify the inclination of a bow at the time of an archery competition and grasp the movement tendency of a competitor during a trial in real time. It is an object of the present invention to provide a skew correction device and a skew correction method that can perform the skew correction.

   In order to achieve such an object, the present invention relates to a skew correction device (100) that measures the skew of a bow (21) possessed by an athlete and urges the athlete to correct the skew. )), And a child terminal (2) for inputting acceleration measured by the acceleration sensor (1-1) as sensor data, wherein the child terminal (2) is an acceleration sensor. An inclination calculating means (2-3) for calculating the inclination of the bow (21) held by the competitor from the acceleration measured by (1-1), and a bow calculated by the inclination calculating means (2-3). (21) a tilt display means (2-4) for displaying the tilt.

  In the present invention, the acceleration sensor (1-1) is mounted on the bow (21), and the acceleration measured by the acceleration sensor (1-1) is sent to the child terminal (2). The child terminal (2) calculates the inclination of the bow (21) of the competitor from the acceleration measured by the acceleration sensor (1-1), and displays the calculated inclination of the bow (21). Thereby, it is possible to quantify the inclination of the bow (21) in the archery competition and grasp the movement tendency of the competitor during the attempt in real time.

  In the above description, as an example, constituent elements in the drawings corresponding to constituent elements of the present invention are indicated by reference numerals with parentheses. In the present invention, a gyro sensor may be provided instead of the acceleration sensor.

  As described above, according to the present invention, it is possible to quantify the inclination of the bow at the time of an archery competition and grasp the movement tendency of the competitor during the attempt in real time.

FIG. 1 is a diagram showing a main part of a skew correcting apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing the installation state of the sensor terminal of the skew correction device on the bow together with the child terminal. FIG. 3 is a diagram illustrating an example of the inclination θ of the bow calculated by the inclination calculating unit in the inclination correction device. FIG. 4 is a diagram showing a drawing operation, an anchoring operation, a release operation, and a follow-through operation when performing an archery competition. FIG. 5 is a diagram illustrating a main part of a skew correcting apparatus according to Embodiment 2 of the present invention. FIG. 6 is a diagram showing measured values of the inclination φ of the X-axis with respect to the vertical direction of the acceleration sensor in the inclination correction device. FIG. 7 is a diagram illustrating a difference value φ ′ of φ. FIG. 8 is a diagram in which the measured values θ1 to θ3 of the three shooting operations are superimposed and drawn on the display unit of the child terminal with the release operation occurrence time set to 0 second. FIG. 9 is a diagram showing a main part of a skew correcting apparatus according to Embodiment 3 of the present invention. FIG. 10 is a diagram showing a change in the inclination according to the presence or absence of a calling unit in the inclination correction device. FIG. 11 is a diagram illustrating an example in which a calling unit is configured by a first calling unit and a second calling unit in the inclination correcting apparatus according to the third embodiment. FIG. 12 is a diagram showing a main part of a skew correcting apparatus according to Embodiment 4 of the present invention. FIG. 13 is a diagram showing a bow on which the sight is mounted.

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

[Embodiment 1]
FIG. 1 is a diagram showing a main part of a skew correcting apparatus 100 according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a sensor terminal, and 2 denotes a child terminal that receives sensor data from the sensor terminal 1. The sensor terminal 1 is installed on the bow 21 as shown in FIG.

  The skew correction device 100 includes a sensor terminal 1 having, for example, a three-axis acceleration sensor and a three-axis gyro sensor, and a child terminal 2 that performs wireless communication with the sensor terminal 1. In the present embodiment, the sensor terminal 1 includes a three-axis acceleration sensor 1-1 as a sensor. As the child terminal 2, a smartphone, a tablet, a notebook computer, or the like is used. The three axes of the acceleration sensor 1-1 are arranged, for example, on the axes indicated by XYZ in FIG.

  In the sensor terminal 1, the acceleration sensor 1-1 measures the acceleration during the attempt at a sampling rate of 25 Hz. The measured acceleration is stored as sensor data in a storage unit 1-2 such as an HDD or a memory, and is then stored in “BlueTooth (registered trademark)”, “WiFi (registered trademark)”, “LTE (registered trademark)”, or the like. Is transmitted to the child terminal 2 via the transmission unit 1-3.

  The child terminal 2 includes a receiving unit 2-1, a storage unit 2-2, an inclination calculating unit 2-3, and a display unit 2-4, and the sensor from the sensor terminal 1 received by the receiving unit 2-1. The data is stored in the storage unit 2-2. In the child terminal 2, the inclination calculating unit 2-3 calculates the inclination of the bow 21 of the player M (see FIG. 4) from the sensor data stored in the storage unit 2-2. The display unit 2-4 draws (displays) the inclination of the bow 21 calculated by the inclination calculation unit 2-3 on the display.

  The tilt calculating unit 2-3 calculates the tilt of the bow 21 of the player M from the acceleration measured by the acceleration sensor 1-1. In this case, the inclination of the bow 21 is obtained by modifying the reference to the description in Non-Patent Document 2 and using the following equations (1), (2-1), or (2-2).

In the above equations (1), (2-1), and (2-2), θ is the inclination of the Y axis of the acceleration sensor 1-1 with respect to the vertical direction, and φ is the X of the acceleration sensor 1-1 with respect to the vertical direction. It is the inclination of the axis, and the unit is degree. A _{x, out} , A _{y, out} , A _{z, out} are output values of the acceleration sensor 1-1, and the unit is a gravitational acceleration G (1.0 G ≒ 9.8 m / s ² ).

  In the above equations (1), (2-1), and (2-2), the ratio of the measured value of the single axis to the magnitude (norm) of the composite vector of the output value of the acceleration sensor 1-1 is obtained. Further, by calculating the inverse function of the cosine, the inclination θ of the Y axis and the inclination φ of the X axis of the acceleration sensor 1-1 are calculated as values having an angle dimension. According to the direction of the axis shown in FIG. 2, the information necessary to grasp the inclination of the bow 21 is θ. The inclination θ of the Y-axis of the acceleration sensor 1-1 is calculated as the inclination of the bow 21 (the inclination of the bow 21 with respect to the direction of the ground normal).

  FIG. 3 shows an example of the inclination θ of the bow 21 calculated by the inclination calculating section 2-3. In FIG. 3, S1 indicates a period of a drawing operation (see FIG. 4A) when performing an archery competition, S2 indicates a period of an anchoring operation (see FIG. 4B), and S3 indicates a release operation (see FIG. 4B). 4C), and S4 indicates the period of the follow-through operation (see FIG. 4D). M is a player with a bow 21.

  In FIG. 3, the change in the angle is reduced during the anchoring operation period S2 compared to the drawing operation period S1, and it is possible to grasp the situation where the aim is set while the bow 21 is not moved. Further, in the follow-through operation period S4 after the release operation period S3, it can be confirmed that a change occurs in the θ direction when the bow 21 faces downward. Thus, by calculating the inclination θ of the Y-axis of the acceleration sensor 1-1, the inclination of the bow 21 can be quantified, and the movement tendency of the competitor M during the attempt can be grasped. .

[Embodiment 2]
FIG. 5 shows a main part of a skew correcting apparatus 200 according to Embodiment 2 of the present invention. 2, the same reference numerals as those in FIG. 1 denote the same or equivalent components as those described with reference to FIG. 1, and a description thereof will be omitted.

  The skew correction device 200 of the second embodiment is a modification of the skew correction device 100 of the first embodiment, and is characterized in that the child terminal 2 includes an event detection unit 2-5.

  The event in the event detection unit 2-5 refers to the occurrence of the release operation and the follow-through operation during the attempt, and the event detection unit 2-5 uses the above-described formula (2-1) and (2) -2) Detection is performed using the value of φ calculated by the equation.

FIG. 6 shows the measured value of φ, and FIG. 7 shows the difference value φ ′ of φ. The horizontal axis is time, and the release operation occurrence time is set to 0 second. The vertical axis is the angle. Incidentally, when the phi at t-th from the measurement start and phi _t, difference phi _'t is, phi' shall be obtained as _{t = φ t + 1 -φ t} (t = 1,2,3 ···) .

The release operation is detected using the difference value φ ′ of φ (FIG. 7). At the time of release, sharp artifacts are measured due to the strong recoil of the strings. The release operation is detected under the following condition 1 using this artifact.
Condition 1: 'When _t, phi' a difference value between phi at t-th from the measurement start _{φ t-1 ≧ -3, φ} 't ≦ -3, φ' t + 1 ≧ -3, be satisfied.

  When this condition is satisfied, “1” is set, and when this condition is not satisfied, “0” is set. The line I shown together with the difference value φ ′ shown in FIG. 7 is a line indicating whether or not this condition is satisfied (a line indicating the detection result). In the line I indicating the detection result, “0” is shown. Where the value changes from "1" to "1" indicates that the release operation is occurring. That is, the release operation can be accurately detected by using the above condition 1.

The detection of the follow-through operation is performed using the measured value φ (FIG. 6). In the follow-through operation, it can be confirmed from FIG. 6 that the value of φ changes from about 0 ° to about −90 ° due to the rotation of the bow 21 in the φ direction. Using this feature, the value of φ is detected under the following condition 2.
Condition 2: The value of φ, which was larger than −10 °, is reduced to −10 ° or less, and becomes −60 ° or less within 1 second after this change occurs.

  A line indicating the detection result of the follow-through operation under the condition 2 is shown as a line II in FIG. The line II showing the detection result changes from “0” to “1” when the measured value φ falls below −60 °. This indicates that the follow-through operation has been detected.

  In the present embodiment, in consideration of the case where the conditions 1 and 2 are accidentally satisfied, the condition 1 is first generated within 2 seconds and the condition 2 is generated later within 2 seconds, not the single occurrence of the conditions 1 and 2. This is called event detection. By performing such an event detection, the detection of the release operation and the follow-through operation can be automated, so that even when a plurality of shots are performed, the inclination θ of the bow 21 during the desired operation period can be easily grasped. can do.

  FIG. 8 illustrates the measured values θ1 to θ3 of the three shooting operations overlaid on the display unit 2-4 of the child terminal 2 with the release operation occurrence time set to 0 second. Since the inclination θ of the bow 21 in each round and the length of the anchoring operation period S2 can be easily compared, confirmation and improvement of the operation can be encouraged.

[Embodiment 3]
FIG. 9 shows a main part of a skew correcting apparatus 300 according to Embodiment 3 of the present invention. 5, the same reference numerals as those in FIG. 5 denote the same or equivalent components as those described with reference to FIG. 5, and a description thereof will be omitted.

  The skew correction device 300 according to the third embodiment is a modification of the skew correction device 200 according to the second embodiment, and includes a skew threshold setting unit 2-6 that sets a threshold value with an arbitrary skew value. An inclination determining unit 2-7 that determines the magnitude of the inclination θ of the bow 21 by comparing with a threshold value set by the inclination threshold setting unit 2-6, and a bow 21 that is determined by the inclination determining unit 2-7. And a calling unit 2-8 that prompts the competitor M to make correction by calling a voice based on the magnitude of the inclination θ.

  The tilting threshold setting unit 2-6 sets the tilting threshold to ± 1 ° using an input function such as a touch panel of a smartphone, and sets the threshold before shooting operation. The set threshold value is transmitted to the tilt determination unit 2-7, and when the threshold condition is satisfied, that is, when the tilt θ of the bow 21 during the shooting operation exceeds + 1 ° and below −1 °. Then, a notification signal is transmitted to the calling unit 2-8. The calling unit 2-8, which has received the notification signal, calls two types of voices to signal the competitor M, thereby urging the competitor M whose inclination is remarkably inclined to perform correction.

  For the two kinds of sounds, for example, of a plurality of oscillation sounds (beep sounds) of a smartphone, two types that can be clearly identified are used. Will emit a low tone. The oscillating sound keeps calling if the above threshold condition is satisfied, and stops calling if the threshold condition is not satisfied.

  In this manner, in the present embodiment, the player M can recognize in real time that his / her inclination is remarkable by voice call, and the gradient at which the call stops (-1 ° or more and + 1 °). By making it possible to carry out the training to correct the inclination to the following, the inclination can be reduced. FIG. 10 shows a change in the tilt due to the presence or absence of the calling unit 2-8 (θA: call is made, θB: no call is made). The inclination during the operation period S2 of the anchoring is reduced, and correction of the inclination can be confirmed.

  As shown in FIG. 11, the calling unit 2-8 includes a first calling unit 2-81 and a second calling unit 2-82, and the first calling unit 2-81 uses the first calling unit 2-81. While the player M who is remarkably inclined is urged to make correction, the second calling unit 2-82 may be used to urge the anchoring operation period to be constant. The tilt correcting device including the first calling unit 2-81 and the second calling unit 2-82 is referred to as a tilt correcting device 300 '.

  In the inclination correcting device 300 ', the second calling unit 2-82 is activated after the first calling unit 2-81 is stopped due to the deviation from the threshold condition. The second calling unit 2-82 periodically emits an oscillating sound at one-second intervals like a metronome. Thereby, the competitor M counts the number of calls made by the second calling unit 2-82 after entering the anchoring operation, and releases the same number of calls, thereby completing the correction during the anchoring operation period. Arrows can be fired at the same time interval from to release. Thereby, the stabilization of the operation can be promoted.

  Further, in the third embodiment, the correction is urged to the competitor M by voice. However, light emission or image means using a monitor of a smartphone or a tablet may be used. Further, a vibration unit using a vibrator (actuator) of a smartphone or tablet may be used.

  9 and 11 show modified examples of the skew correction device 200 according to the second embodiment. However, the skew correction device 100 according to the first embodiment also applies to the skew correction device 300 according to the third embodiment. Similarly to (300 '), the child terminal 2 may be provided with an inclination threshold setting unit 2-6, an inclination determination unit 2-7, and a calling unit 2-8 (2-81, 2-82). .

[Embodiment 4]
FIG. 12 shows a main part of a skew correcting apparatus 400 according to Embodiment 4 of the present invention. 11, the same reference numerals as those in FIG. 11 denote the same or equivalent components as those described with reference to FIG. 11, and a description thereof will be omitted.

  The skew correction device 400 according to the fourth embodiment is a modified example of the skew correction device 300 ′ according to the third embodiment, and includes a moving image photographing unit 2-9 that photographs a moving image of the player M holding the bow 21. A photographing data storage unit 2-10 for storing photographing data photographed by the moving image photographing unit 2-9; And a photographing data editing unit 2-11 for editing and processing the photographing data.

  In the skew correction apparatus 400 according to the fourth embodiment, the moving image photographing unit 2-9 photographs the movement of the competitor M using a camera built in a smartphone or the like. The activation of the moving image photographing unit 2-9 is triggered by the start of the reception of the sensor data from the sensor terminal 1, and the photographing is stopped when the reception is completed. Since the stored photographing data includes images other than those during the shooting operation, and is redundant for browsing the shooting operation, it is desirable to extract only the images during the shooting operation.

  For this reason, in the present embodiment, the photographing data editing unit 2-11 cuts out only a total of 20 seconds including 10 seconds before and after the release operation based on the occurrence time of the release operation detected by the event detection unit 2-5. And edit it as a short video. With this function, it is possible to browse by observing the inclination θ of the bow 21 during the shooting operation obtained from the sensor data from the sensor terminal 1 and the state of the operation from the appearance obtained from the moving image.

  FIG. 12 shows a modified example of the skew correction device 300 ′ according to the third embodiment. However, the skew correction devices 100 and 200 according to the first and second embodiments also apply to the skew correction device according to the third embodiment. In the straightening device 300 as well, similarly to the skew correcting device 400 of the fourth embodiment, the child terminal 2 is provided with a moving image shooting unit 2-9, a shooting data storage unit 2-10, and a shooting data editing unit 2-11. Is also good. In the first to fourth embodiments, a gyro sensor may be provided instead of the acceleration sensor 1-1.

[Expansion of Embodiment]
As described above, the present invention has been described with reference to the exemplary embodiments. However, the present invention is not limited to the above exemplary embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention. In addition, the embodiments can be arbitrarily combined and implemented within a range that does not contradict each other.

  DESCRIPTION OF SYMBOLS 1 ... Sensor terminal, 1-1 ... Acceleration sensor, 1-2 ... Storage part, 1-3 ... Transmission part, 2 ... Child terminal, 2-1 ... Reception part, 2-2 ... Storage part, 2-3 ... Oblique Tilt calculating section, 2-4 display section, 2-5 event detecting section, 2-6 tilt tilt setting section, 2-7 tilt determining section, 2-8 calling section, 2-81 First calling section, 2-82 second calling section, 2-9 moving image shooting section, 2-10 shooting data storage section, 2-11 shooting data editing section, 21 bow, 100- 400 ... Skew straightening device.

Claims (8)

A skew correction device that measures the skew of a bow that a competitor has, and urges the competitor to perform correction,
An acceleration sensor mounted on the bow;
A child terminal that inputs the acceleration measured by the acceleration sensor as sensor data,
The child terminal,
Inclination calculating means for calculating the inclination of the bow of the athlete from the acceleration measured by the acceleration sensor,
A tilt display device for displaying the tilt of the bow calculated by the tilt calculation device. In the skew correction device according to claim 1,
The child terminal,
An inclination correction device comprising: an event detection unit that detects, as an event, a specific type of motion when the competitor shoots an arrow based on the acceleration measured by the acceleration sensor. In the skew correction device according to claim 1 or 2,
The child terminal,
Inclination determining means for determining by comparing the magnitude of the inclination of the bow calculated by the inclination calculating means with a predetermined threshold,
An inclination correcting device comprising: a calling unit that prompts the competitor to perform correction by voice based on the magnitude of the inclination of the bow determined by the inclination determining unit. In the skew correction device according to claim 3,
The calling means,
First calling means for prompting the athlete to correct by voice when the inclination of the bow exceeds the threshold;
A second calling unit that repeats a voice call at predetermined intervals when the inclination of the bow that has exceeded the threshold value falls below the threshold value. In the skew correction device according to any one of claims 1 to 4,
The child terminal,
Moving image photographing means which is started when the reception of sensor data from the acceleration sensor is started and photographs the movement of the competitor,
Photographing data storing means for storing photographing data photographed by the moving image photographing means;
A skew correction device for editing photographic data stored in the photographic data storage means. In the skew straightening device according to any one of claims 1 to 5,
A skew correction device comprising a gyro sensor instead of the acceleration sensor. In the skew straightening device according to any one of claims 1 to 5,
The inclination calculating means,
From the acceleration measured by the acceleration sensor, the inclination θ of the Y axis with respect to the vertical direction of the acceleration sensor is calculated using the following equation (1), and the inclination φ of the X axis with respect to the vertical direction of the acceleration sensor is calculated as A skew correction apparatus characterized in that it is calculated using equation (1) or equation (2-2).
In the above equations (1), (2-1), and (2-2), A _{x, out} , A _{y, out} , and A _{z, out} are the X-axis, Y-axis, and Z-axis directions of the acceleration sensor. Output value of. A tilt correction method that measures a tilt of a bow of a competitor and urges the competitor to correct,
A first step of measuring acceleration by an acceleration sensor provided in the sensor terminal attached to the bow;
A second step in which the sensor terminal inputs the acceleration measured in the first step to the slave terminal as sensor data;
With
The second step includes:
A third step in which the inclination calculating means of the child terminal calculates the inclination of the bow of the player from the acceleration measured in the first step;
A fourth step of displaying the inclination of the bow calculated in the third step , wherein the inclination display means of the child terminal displays the inclination of the bow calculated in the third step.