JP2007167549A - Apparatus and method for analyzing golf club head behavior, and sheet material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head behavior analyzing method capable of more easily and correctly analyzing the behavior of a golf club head in hitting a shot compared with a conventional manner. <P>SOLUTION: The golf club head behavior analyzing method comprises a step for radiating laser beams 6 in the crossing direction with a golf club passage direction at the rear side in swinging direction from a head speed detector 3; a step for determining whether the shot is hit or not, based on speed and order in blocking the plurality of laser beams 6; a step for successively allowing two strobe lighting fixtures 9B to emit light at a timing corresponding to the swinging speed; a step for performing multiple photographing by allowing two camera systems 9A to photograph the golf club head 100 at a plurality of places from directions different in view angle; and a step for fetching a plurality of kinds of golf club head image information photographed by the camera systems 9A and obtaining the behavior of the golf club head 100 in hitting the shot. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf club head behavior analysis device, a golf club head behavior analysis method, and a sheet material, and in particular, a golf club head behavior analysis device and a golf club head behavior analysis method for analyzing the behavior of a golf club head during a shot. And a sheet material used in the analysis method.

  It is required to design a golf club corresponding to the swing characteristics of each golfer. On the other hand, for example, in Japanese Patent Application Laid-Open No. 2005-211191 (Patent Document 1), one partial model is sequentially selected from a reference golf club model, and only the design parameters of the selected partial model are changed for simulation. A golf club design method is disclosed in which a calculation is performed to obtain a relationship between design parameters and characteristic values for each portion, and an overall optimization design plan for the golf club is derived based on the relationship for each portion.

  Also, in Japanese Patent Application Laid-Open No. 2003-117064 (Patent Document 2), a certain region in the traveling direction of a golf ball immediately after hitting is illuminated with a strobe illuminator at a predetermined timing, and the golf ball is photographed at two front and rear points. Thus, there is disclosed a hit ball diagnostic apparatus that determines a flying ball direction, a flying distance, and the like based on the ball speed and rotation.

  In Japanese Patent No. 2826697 (Patent Document 3), first and second imaging devices that multiplex-shoot images of marks provided at at least three locations on the face surface of a golf club head from different locations, and the imaging devices. Of a golf club head comprising: mark extraction means for extracting the mark from the image captured in step 3; and three-dimensional coordinate calculation means for calculating the three-dimensional coordinates of the mark from the two-dimensional coordinates of the mark obtained by the mark extraction means. A motion measurement device is disclosed.

  Similarly, a method of photographing a mark attached to a golf club head and measuring the behavior of the golf club head at the time of a shot is disclosed in JP-A-2005-34619 (Patent Document 4) and JP-A-2003-199859 ( Patent Document 5) and Japanese Patent Application Laid-Open No. 2004-24488 (Patent Document 6).

Japanese Patent Application Publication No. 2002-525613 (Patent Document 7) discloses a method of measuring the flight trajectory of a golf ball by attaching dots to the golf ball.
JP 2005-21191 A Japanese Patent Laid-Open No. 2003-117064 Japanese Patent No. 2826697 JP-A-2005-34619 JP 2003-199859 A JP 2004-24488 A Japanese translation of PCT publication No. 2002-525613

  In Patent Document 2, the state of the hit ball is determined by shooting the shot golf ball. However, by analyzing the behavior of the golf club head at the time of the shot, the cause of the hitting characteristics of each golfer is more It is thought that it can be grasped accurately.

  In patent documents 3-6, although the mark provided in the golf club head was image | photographed and the motion of a golf club head was measured, the device at the time of actually analyzing is fully disclosed by the said literature. It can not be said. For example, Patent Documents 3 to 6 do not sufficiently disclose an appropriate arrangement of a trigger device for detecting that a shot is made and starting shooting or the like.

  The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to analyze the behavior of a golf club head during a shot more easily and more accurately than before. An object is to provide a club head behavior analysis apparatus, a golf club head behavior analysis method, and a sheet material used in the analysis method.

  A golf club head behavior analysis apparatus according to the present invention is a golf club head behavior analysis apparatus that analyzes the behavior of a golf club head during a shot by photographing the golf club head, and detects the head speed during the shot. Laser light is irradiated at least at two locations in the direction intersecting the passing direction of the golf club on the rear side in the swing direction from the speed detector and the head speed detector, and each laser light is blocked by the passing of the golf club. A trigger sensor that detects the occurrence of a shot and a detection result of the trigger sensor, and a swing speed and a swing direction are detected based on the speed and order in which a plurality of laser beams are blocked, and a shot for determining whether or not a shot has been performed Judgment means and a certain area of the swing direction at the time of a shot And at least two strobe illuminators capable of illuminating a golf club head included in the golf club, and strobe emission setting means for sequentially emitting a plurality of strobe illuminators at a timing according to the swing speed detected by the shot determining means, At least two camera devices for photographing a golf club head irradiated by a strobe illuminator from a direction with different viewing angles at a plurality of locations in the above-mentioned region and multiply photographing a plurality of golf club head images in a photographing screen A camera driving means for performing shooting by the camera device at a timing according to the swing speed detected by the shot determining means, and a plurality of golf club head image information photographed by the camera device, and a golf club head at the time of shot Head behavior calculation means to determine the behavior of the head , And output means for outputting the operation result by the head behavior calculation means.

  According to the above configuration, the presence / absence of a shot and the swing speed can be accurately detected by the trigger sensor, and the analysis of the head behavior can be started. And from the detection of the shot to the analysis of the behavior of the golf club head and its output can be performed fully automatically. As a result, the behavior of the golf club head during a shot can be analyzed more easily and more accurately than in the past.

  In the golf club head behavior analysis apparatus, preferably, the shot determination means blocks when a plurality of laser beams are blocked at a constant speed or when the laser beams are blocked from a side far from the golf ball toward a side closer to the golf ball. If not, it is determined not to be a shot.

  Thereby, when a golf club interrupts | blocks a laser beam except at the time of a shot, it can suppress that a golf club head behavioral analysis apparatus will operate | move.

  In the golf club head behavior analysis apparatus, preferably, a golf club head having at least three marks attached to the face portion and having a certain luminance difference from the face portion is applied.

  Thereby, the behavior of the golf club head at the time of a shot can be detected more accurately using the DLT method or the like.

  In the golf club head behavior analysis apparatus, preferably, the head behavior calculation means obtains at least one information of a face surface angle, a hit point position, and a swing path at the time of a shot. This makes it possible to accurately diagnose the characteristics of the hit ball.

  In the golf club head behavior analysis apparatus, preferably, the display means is capable of displaying the information obtained by the head behavior calculation means in a plurality of strokes. Thereby, a plurality of strokes can be totaled and analyzed.

  Here, “displaying a plurality of shots collectively” includes both separately indicating the values in each shot and indicating the average of the values in each shot.

  In the golf club head behavior analysis apparatus, preferably, the laser light used in the trigger sensor crosses the passing direction of the golf club while proceeding in a direction that becomes lower as it approaches the golfer.

  As a result, the direction of the laser light approaches a direction orthogonal to the extending direction of the golf club at the time of the shot, and the golf club at the time of the shot more reliably blocks the laser light. Further, on the side close to the golfer, the components included in the shot determination means can be arranged at a low position, so that it is possible to provide a golf club head behavior analysis device that is unlikely to interfere with a golfer who performs a swing.

  The golf club head behavior analysis apparatus preferably has at least two other strobe illuminators that can illuminate a certain area in the ball traveling direction immediately after impact, and a timing according to the head speed detected by the head speed detector. Shooting screens of other strobe lighting setting means for sequentially emitting light from a plurality of other strobe illuminators and golf balls irradiated by the other strobe illuminators at a plurality of locations in the above region from different viewing angles. And at least two other camera devices that multiplex-shoot images of a plurality of hit balls, and another camera drive that performs shooting by the other camera devices at a timing according to the head speed detected by the head speed detecting means. A plurality of golf ball image information photographed by means and another camera device, Further comprising a hitting state calculating means for obtaining information including the ball flying direction and distance by calculation based on the Le speed and rotation.

  Accordingly, it is possible to perform comprehensive evaluation by linking the golf club head behavior analysis system and the golf ball trajectory analysis system.

  In the golf club head behavior analysis apparatus, preferably, a golf ball having at least eight marks attached to the surface of the golf ball is applied.

  According to the above configuration, since the mark can be stably photographed by the camera device regardless of the rotation state of the ball, the hitting state can be obtained more accurately.

  A golf club head behavior analysis method according to the present invention is a golf club head behavior analysis method for analyzing the behavior of a golf club head during a shot by photographing the golf club head, and detecting the head speed during a shot. A step of irradiating laser beams at at least two locations in the direction crossing the passing direction of the golf club on the rear side in the swing direction from the speed detector, and detecting that each laser beam is blocked by the passing of the golf club Then, using the detection result as an input, a step of detecting a swing speed and a swing direction based on a speed and a sequence in which a plurality of laser beams are interrupted to determine whether or not a shot has been performed, and a constant swing direction at the time of the shot Golf club head included in a golf club in the region of A step of sequentially emitting at least two strobe illuminators that can illuminate at a timing according to the swing speed, and a golf club head irradiated by the strobe illuminator at a timing according to the swing speed by at least two camera devices A plurality of golf club head image information photographed by the camera device, and a step of multiplex photographing a plurality of golf club head images in a photographing screen. The step of acquiring and determining the behavior of the golf club head at the time of shot and the step of outputting the behavior of the golf club head at the time of shot are provided.

  According to the above method, from the detection of a shot to the analysis of the behavior of the golf club head and its output can be performed fully automatically. Then, the behavior of the golf club head during a shot can be analyzed more easily and more accurately than in the past.

  In the golf club head behavior analysis method, preferably, a golf club head having at least three marks having a luminance difference of a certain level or more with respect to the face portion is applied to the face portion.

  Thereby, the behavior of the golf club head at the time of a shot can be detected more accurately using the DLT method or the like.

  Preferably, the golf club head behavior analysis method further includes a step of attaching a mark to the face portion of the golf club head, and the step of attaching the mark includes a step of preparing a sheet material having a marking material attached to a location corresponding to the mark. And aligning the predetermined position on the sheet material with the center of the face portion so that the marking material and the face portion are in contact with each other, and attaching the predetermined position to the center of the face portion. Transferring the applied marking material to the face portion and attaching the marking material.

Thereby, it is possible to accurately mark a predetermined position by a simple method.
The sheet material according to the present invention is a sheet material to which a marking material is attached, which is used in the golf club head behavior analysis method.

  In the sheet material, preferably, the mark has a pattern in which the central portion is white and the peripheral portion is black.

  When a white monochromatic mark is used, it becomes difficult to identify the mark when disturbance such as sunlight enters, that is, when strong light other than the strobe illuminator hits the face portion. On the other hand, the inventors of the present application have confirmed by experiments that when a mark in which black is arranged around white is used, it becomes easy to identify the mark even when a disturbance occurs.

  In the sheet material, preferably, the mark includes a line to be aligned with the leading edge of the golf club head.

Thereby, the sheet material can be easily adjusted to a predetermined position.
The “leading edge” is the front line of the face surface at the boundary between the club face and the sole where the face surface (club face) for hitting the ball of the golf club head and the bottom surface (sole) is in contact. Means part.

  According to the present invention, the behavior of the golf club head at the time of a shot can be fully automatically analyzed by a compact configuration. Then, the behavior of the golf club head during a shot can be analyzed more easily and more accurately than in the past.

  Embodiments and examples of a golf club head behavior analysis apparatus, golf club head behavior analysis method, and sheet material according to the present invention will be described below. Note that the same or corresponding parts are denoted by the same reference numerals, and the description thereof may not be repeated.

  FIG. 1 is a plan view showing a golf club head behavior analysis apparatus according to one embodiment of the present invention. Referring to FIG. 1, the club head behavior analysis apparatus according to the present embodiment includes a mechanical configuration unit 1000 and a signal processing system 2000. The mechanical component 1000 is roughly constituted by six divided devices, that is, a laser type trigger sensor 1, laser reflectors 2 and 4, a laser type head speed detector 3, and apparatus main bodies 9 and 10. The

  The trigger sensor 1 and the laser reflector 2 are fixedly arranged so as to face each other. Among them, the trigger sensor 1 is, for example, in a thin box shape, and has a certain length, width, and height along the swing direction (arrow SW direction), and a pair of laser light emitting and receiving at regular intervals in the swing direction. Part 1A. On the other hand, the laser reflecting plate 2 has a vertical plate shape and is installed with its mirror surface facing the trigger sensor 1. In this embodiment, as shown by the reference numeral 8 in FIG. 1 that indicates the position of the golfer's foot, the golfer typically shots while standing on the laser reflector 2 side. Is possible. The laser light 6 emitted from each laser emitting / receiving unit 1A is reflected by the laser reflecting plate 2, and the reflected light is received by each laser emitting / receiving unit 1A. This laser light is modulated, and consideration is given to an environment with a lot of external light, such as use outside in fine weather.

  The head speed detector 3 and the laser reflector 4 are fixedly disposed on the ground at opposite side positions sandwiching the golf ball 5 at both side positions immediately before the shot on which the golf ball 5 is placed. Among these, the head speed detector 3 has, for example, a thin box shape, and has a certain length along the swing direction (arrow SW direction), a width and a height, and a pair of lasers at regular intervals in the swing direction. It has a light emitting / receiving unit 3A. On the other hand, the laser reflecting plate 4 has a vertical plate shape, and is installed in parallel to the opposite position of the golf ball 5 with the mirror surface facing the head speed detector 3. The laser light 7 emitted from each laser emitting / receiving unit 3A is reflected by the laser reflecting plate 4, and the reflected light is received by each laser emitting / receiving unit 3A.

  The apparatus main bodies 9 and 10 are arranged on the side of a certain area in the ball traveling direction immediately after the impact, for example, on the same side as the head speed detector 3. In FIG. 1, the apparatus main bodies 9 and 10 are separated from each other for convenience of illustration and explanation, but typically, the apparatus main bodies 9 and 10 overlap each other (for example, the apparatus main body 9 is connected to the apparatus main body). 10). The apparatus main bodies 9 and 10 are each provided with two photographing camera devices 9A and 10A using a two-dimensional solid-state imaging device in a box-shaped case body and two photographing strobe illuminators 9B and 10B. It is configured. The two strobe illuminators 9B can illuminate the golf club head just before the impact. The two strobe illuminators 10B can illuminate a certain area in the ball traveling direction immediately after impact. The strobe illuminator 9B emits light at a timing corresponding to a swing speed detected by a shot determination unit described later. The strobe illuminator 10B emits light at a timing corresponding to the head speed detected by the head speed detecting means described later. The camera devices 9A and 10A are disposed so as to sandwich the strobe lighting devices 9B and 10B, respectively. The camera device 9A can photograph the golf club head at the time of the shot at two points before and after the shot at the same timing as the strobe illuminator 9B. The camera device 10A can shoot the shot golf ball 5 at two points before and after the shot at the same timing as the strobe illuminator 10B.

  The signal processing system 2000 includes a club head behavior analysis unit 2000A and a golf ball trajectory analysis unit 2000B. The club head behavior analysis unit 2000A is incorporated in the apparatus body 9, and includes a shot determination unit 11A, a strobe emission setting unit 12A, a camera drive unit 13A, and a head behavior calculation unit 14A. The golf ball trajectory analyzing unit 2000B is incorporated in the apparatus main body 10 and includes a head speed detecting unit 11B, a strobe light emission setting unit 12B, a camera driving unit 13B, and a hit ball state calculating unit 14B. The analysis results by the club head behavior analysis unit 2000A and the golf ball trajectory analysis unit 2000B are displayed as an image on the output means 15 installed at an arbitrary position.

  In the club head behavior analysis unit 2000A, the shot determination unit 11A receives the detection data from the trigger sensor 1 and determines whether or not a shot has been performed. That is, the two laser beams 6 irradiated from the laser emitting / receiving unit 1A of the trigger sensor 1 in the direction intersecting with the passing direction (arrow SW direction) of the golf club are sequentially blocked by the passing of the golf club. The shot motion can be detected in front of the golf ball 5 by blocking the reflected light from the reflector 2. The detection signal of the trigger sensor 1 is sent to the apparatus main body 9 via a cable or the like. Then, the order in which the respective laser beams 6 are blocked and the time difference are detected. In this case, it is determined that the shot is not a shot when the two laser beams 6 are blocked at a certain speed or below, or when the blocking direction is not in the order of the one farther away from the golf ball 5 and the next closest one. A restriction that does not start the next shooting is set.

  The strobe light emission setting unit 12A performs control to cause the strobe illuminator 9B to emit light at a timing corresponding to the swing speed detected by the shot determination unit 11A. The camera driving means 13A is for performing photographing by the camera device 9A in accordance with the swing speed by the shot determining means 11A, and the golf club head immediately before the shot irradiated by the strobe lighting device 9B is determined at two predetermined points. Outputs a command to shoot. The head behavior calculation calculation means 14A takes in the club head image information photographed by the camera device 9A and obtains the behavior of the golf club head at the time of the shot. Then, the output unit 15 outputs the calculation result by the head behavior calculation unit 14A.

  In the golf ball trajectory analysis unit 2000B, the head speed detection unit 11B detects the head speed based on the cutoff interval of the laser light 7. The strobe light emission setting unit 12B performs control to cause the strobe lighting device 10B to emit light at a timing corresponding to the head speed detected by the head speed detection unit 11B. The camera driving unit 13B performs photographing by the camera device 10A in accordance with the head speed by the head speed detecting unit 11B, and two predetermined points for the golf ball 5 immediately after the shot irradiated by the strobe illuminator 10B. Command to shoot with. The hitting state calculation means 14B takes in the head speed information detected by the head speed detection means 11B and the ball image information photographed by the camera device 10A, and obtains the flying ball direction, the flying distance, and the like by calculation based on the ball speed and rotation. . And the output means 15 outputs the calculation result by a hit ball state calculating means.

  In FIG. 1, a head speed detector 3 and a laser reflector 4 are provided in the vicinity of a golf ball 5 to be shot. On the other hand, the trigger sensor 1 and the laser reflection plate 2 are provided on the rear side of the head speed detector 3 and the laser reflection plate 4. Here, the head speed detector 3 and the laser reflector 4 are related to the setting of illumination / shooting timing of the golf ball 5 after the shot, and the trigger sensor 1 and the laser reflector 2 are used for the golf club before the shot. This is related to the setting of the head illumination / shooting timing. Therefore, as described above, the head speed detector 3 and the laser reflecting plate 4 are disposed in the vicinity of the golf ball 5, and the trigger sensor 1 and the laser reflecting plate 2 are located behind the head speed detector 3 and the laser reflecting plate 4. By disposing them, the strobe light emission / photographing timings in the club head behavior analysis unit 2000A and the golf ball trajectory analysis unit 2000B can be set appropriately. For example, in FIG. 1, the distance L1 from the golf ball 5 to the head speed detector 3 and the laser reflector 4 is about 20 mm to 150 mm, and the distance L2 from the golf ball 5 to the trigger sensor 1 and the laser reflector 2 Is about 200 mm or more and 600 mm or less.

  FIG. 2 is a diagram illustrating a state in which the club head behavior analysis apparatus illustrated in FIG. 1 is viewed from the swing direction. Referring to FIG. 2, head speed detector 3 and laser reflector 4 are provided at substantially the same height at a relatively low position. Therefore, the laser beam 7 reciprocating between the head speed detector 3 and the laser reflector 4 crosses the golf club passing direction while traveling in a substantially horizontal direction. On the other hand, the trigger sensor 1 is provided at a position higher than the laser reflector 2. Thereby, the laser beam 6 reciprocating between the trigger sensor 1 and the laser reflecting plate 2 crosses the passing direction of the golf club while proceeding in a lowering direction as it approaches the golfer. In FIG. 2, the horizontal distance B between the trigger sensor 1 and the laser reflector 2 is about 500 mm to 1200 mm, and the vertical distance H between the trigger sensor 1 and the laser reflector 2 is about 100 mm to 600 mm. is there.

  Since the head speed detector 3 and the laser reflector 4 are provided in the vicinity of the golf ball 5, the golf club intersects with the laser beam 7 at a relatively low position. Since the trigger sensor 1 and the laser reflector 2 are provided on the rear side of the head speed detector 3 and the laser reflector 4, the club head or club shaft in the golf club has a laser beam at a relatively high position. Cross 6 In contrast, in the present embodiment, by providing the trigger sensor 1 at a position higher than the head speed detector 3, the laser light 6 can travel higher than the laser light 7. Further, the laser beam 6 travels at an angle close to the direction orthogonal to the extending direction of the golf club during the swing. As a result of the above, it is possible to prevent the measurement error from occurring by ensuring that the golf club being swung blocks the laser beam. Since the laser reflector 4 located on the golfer side is provided at a low position, it does not give a feeling of pressure to the golfer who performs the swing.

  FIG. 3 is a view showing a golf club head having a face portion with a mark. Referring to FIG. 3, for example, marks 110 </ b> A, 110 </ b> B, 110 </ b> C, 110 </ b> D are attached to the face portion of golf club head 100. The mark has a luminance difference of a certain level or more from the face part so that the mark can be recognized on an image photographed by the camera device 9A. By extracting the position of the mark and the position of the golf ball 5 on the photographed image, the behavior of the golf club head 100 can be analyzed. The position of the mark is automatically extracted by image processing. However, depending on the lightness and darkness of the background, the mark position may be extracted manually. Note that at least three marks (more preferably four or more) are required to be attached to the face portion, but the number can be arbitrarily changed. For example, by using four marks and identifying a plane equation by the least square method using four points, it is possible to improve the measurement accuracy in consideration of errors caused by digitizing.

  FIG. 4 is a flowchart for explaining the golf club behavior analysis method according to the present embodiment. Referring to FIG. 4, after starting by switching on, laser light is irradiated (S1), and then it is determined whether or not there is light shielding (S2). If there is no light shielding (S2: NO), the above determination is repeated. If there is light shielding (S2: YES), it is determined whether or not it is a shot (S2-1). As described above, if the light shielding order is different from the swing direction, it is determined not to be a shot (S2-1: NO), and the above determination is repeated until it is determined to be a shot. If it is determined that the shading is a shot (S2-1: YES), the shading speed of the laser light 6 is detected (S3), and the swing speed is obtained.

  Next, the flash emission timing is calculated by the flash emission setting means 12A (S4), and then the flash emission is performed by the flash illumination tool 9B (S5). Immediately after this, two-point shooting is performed by each camera device 9A (S6), and the ball position and the head marker position in a stationary state are extracted (S7, S8). Next, the extracted coordinates are converted into three-dimensional coordinate positions by a DLT (DirectLiner Transformation) method described later (S9). Then, the posture / behavior of the golf club head at the time of impact is obtained from the three-dimensional coordinates of the ball position and the head marker position (S10). The analysis results are aggregated and analyzed (S11) and output to the monitor which is the output means 15 (S12).

  In the present embodiment, the golf club head behavior analysis system and the golf ball trajectory analysis system can be linked to perform comprehensive evaluation. The golf ball trajectory analysis system will be described with reference to FIGS.

  FIG. 5 is a flowchart for explaining the flow of the golf ball trajectory analysis method. As shown in FIG. 5, after starting by switching on, laser light is irradiated (S101), and then it is determined whether there is light shielding (S102). If there is no light shielding (S102: NO), the above determination is repeated. If there is light shielding (S102: YES), the head speed is detected by the head speed detecting means 11B (S104).

  Next, the flash emission timing is calculated by the flash emission setting means 12B (S105), and then the flash lighting by the flash illumination tool 10B is performed (S106). Immediately after this, two-point shooting is performed by each camera device 10A (S107).

Since the ball mark is painted black, it can be distinguished from the white color of the surrounding ball by binarization image processing, and the coordinate position can be calculated. Similarly, the ball itself is white and can be distinguished from the surroundings, and the center position of the ball can be calculated. (S108)
6 and 7 show an example of the applied golf ball. As shown in FIG. 6, in the golf ball 5 applied in the present embodiment, eight marks are arranged in a range visible from one direction (front), and the large circle mark 18 and the small circle mark 19 have different diameters. It is circular, and is filled with a certain distance apart. For the analysis, two of the eight points of the great circle mark 18 and the small circle mark 19, the geometric center point of the ball 5, and one outer product point that can be obtained from these three points There are a total of 4 elements.

  The two marks taken and extracted from the two cameras and the geometric center point of the ball are converted into three-dimensional coordinate positions by the DLT method. The conversion process by the DLT method will be described later.

  Basically, it is possible to analyze the geometrical center point of the ball 5 and two points of the great circle mark 18 and the small circle mark 19 as a total of three elements, but in the present embodiment, Further determines the fourth point from the coordinates by outer product. Thus, in addition to the two marks and the one geometrical center point, the reason for performing the calculation with four points including the outer product may include a large error appearing on one plane in the case of three points. On the other hand, it is because it can eliminate that a big error appears by using four points.

  8 and 9 show the form of the golf ball 5 immediately after a shot captured by the two camera devices 10A. As shown in these figures, the positions of the two large circle marks 18 and small circle marks 19 of the golf ball 5 change with movement, so that the ball speed rotation number, the rotation axis inclination, the side spin, and the jump angle Analytical elements such as side deflection angle can be obtained.

  In the above-described process, the flash emission intervals (time) of the two strobe illuminators 3B and the two laser beams are generated so that the great circle mark 18 and the small circle mark 19 displayed on the golf ball do not rotate 180 °. An imaging interval (time) by the light receiving unit 3A is determined. For example, 0.96 msec to 7.52 msec is appropriate as the light emission interval and the imaging interval.

  Then, as described above, the order of the two marks on each spherical surface is determined based on the two captured images. However, as a possibility of misunderstanding, each spherical surface in one image is A case where the marks 18 and 19 are recognized in the reverse order is considered. Even in this case, by setting the above so as not to rotate by 180 ° or more, even if the same two points cannot be photographed by two strobe flashes, the mark 8 is detected from two different mark positions. The coordinate values of the same two points can be calculated using the relative positional relationship between the points. The number of marks 18 and 19 on the spherical surface must be at least 8 points. The greater the number of points, the higher the accuracy of measuring the order of the two marks on each spherical surface based on the two images taken and the more accurate the behavior of the golf ball can be analyzed. . The number of marks is preferably 8 to 12 points. If the number is less than 8 points, based on the two images taken when the ball is sliced or hooked after hitting the ball, as described above, only one point on each spherical surface may be taken. However, it is difficult to determine the order of the marks, and there is a problem that the measurement accuracy is lowered.

  In the present embodiment, as shown in FIG. 6, a combination of a large circle mark 18 and a small circle mark 19 forms a set of marks. Three sets of these one set marks are combined, and three sets of marks are further formed. By configuring the 8-point mark with the single great circle mark 18 on the left and right sides of the ball, the recognition of the mark can be ensured even if the side spin or the tilt of the rotation axis increases, so the behavior of the golf ball can be analyzed with high accuracy. It is possible.

  Table 1 displays the coordinates of the ball marks shown in FIGS. 6 and 7 and the diameter of the circle.

  Next, based on the conversion to the three-dimensional coordinate position (3D-Coo) by the DLT method, the ball speed, the rotation speed, the rotation axis inclination, the side spin, Backspin, pop-out angle, lateral shake angle, etc. are calculated. By the DLT method, the ball speed rotation number, the rotation axis inclination, the side spin, the jump angle, and the lateral deflection angle are obtained, and a three-dimensional ballistic simulation is performed (FIG. 4: S110).

  The position after the golf ball is hit, that is, a three-dimensional trajectory simulation, is obtained by calculation using a program that solves an equation of motion of F = m · dV / dt.

Assuming that the X-axis is the flying direction, the Z-axis is the horizontal direction, and the Y-axis is the vertical direction, the forces Fx (t), Fz (t), Fy (t) acting on the ball at a certain time t are (1 ) To (3).
Fx (t) = 1/2 (C _D (t) (cos α · cos β) + C _L (t) (cos θ · sin α · cos β + sin α · sin β)) ρAV _B (t) ² (1)
Fz (t) = 1/2 (C _D (t) (cos α · sin β) + C _L (t) (cos θ · sin α · sin β−sin θ · sin β)) ρAV _B (t) ² (2)
Fy (t) = 1/2 (C _D (t) (sin α−C _L (t) (cos θ · cos α)) ρAV _B (t) ² −mg (3)
However, V _B (t) = (Vx (t) ² + Vy (t) ² + Vz (t) ² ) ^1/2
C _D : Drag coefficient C _L : Lift coefficient V _B : Ball speed (m / s)
θ: rotation axis tilt angle (deg)
α: Depression angle (deg)
β: Lateral deflection angle (deg)
A: Ball cross-sectional area (m ² )
ρ: Air density (kg / m ³ )
By solving the above equation of motion, the displacement vector and velocity vector of the ball at an arbitrary time can be calculated.

  The last of the three-dimensional ballistic simulation performed by the above operation is when the golf ball falls on the ground. The run calculation is performed as the final process based on the three-dimensional velocity component (X, Y, Z axes) and the spin amount at that time (FIG. 5: S111). Run calculation means calculation of the total movement amount of the ball after bouncing on the ground. Then, the result of the three-dimensional trajectory simulation is displayed on the output means 15 (FIG. 5: S112).

  The DLT method used in the golf club head behavior analysis system and the golf ball trajectory analysis system will be described in detail below.

  When measuring the coordinates of a subject with a camera or a video camera, the two-dimensional coordinates in the plane parallel to the imaging or video camera can be obtained as they are. In the case of a sketch, the image taken from directly above is a two-dimensional plan view as it is, and the necessary point coordinates of the image may be measured as they are, but it is impossible to photograph from directly above.

  An image taken from the ground is an image taken obliquely, and the coordinates to be measured are three-dimensional coordinates. When calculating three-dimensional coordinates from an image, usually a subject is photographed with two or more cameras, and the three-dimensional coordinates are calculated. When strictly detecting the three-dimensional coordinates, the subject is photographed with two cameras, and the three-dimensional coordinates are calculated by calculation.

  When strictly detecting three-dimensional coordinates, calculation is performed from camera constants such as the positions of the two camera devices, the direction of the optical axis, and the focal point of the lens. However, it is almost impossible to accurately calculate the camera constant at the shooting site, and it is not realistic. Therefore, the DLT method is a method for obtaining coordinate values even when constants depending on camera constants are unknown in the equation for calculating three-dimensional coordinates.

  In this method, a camera constant is obtained by reverse calculation from known coordinate values in the subject, and a three-dimensional coordinate is obtained from the constant.

(1) Relationship between Real Space Coordinates and Coordinates on Imaging Surface As shown in FIG. 10, let Q be an image on the imaging surface of one point P in the real space. The position of Q on the imaging surface is uniquely determined by the center position (camera position) of the lens, the direction of the optical axis, and the distance between the center of the lens and the imaging surface (equal to the focal length of the lens if P is far enough). Is determined.

  Assume that an arbitrary coordinate axis is set on the real space, and the coordinates of the point P and the center O of the lens are (X, Y, Z) and (X0, Y0, Z0) with respect to the coordinate system, respectively. Further, let F be the distance between the surface that includes the point Q and is perpendicular to the optical axis and the center of the lens. It is assumed that the coordinates on the imaging surface of the image Q of P are (U, V) when an arbitrary coordinate axis is taken on the imaging surface (however, the coordinate unit is the same as the real space coordinates).

Regarding the relationship between the point P and its image Q, the following equations (4) and (5) U−U ₀ = −F · {m ₁₁ (X−X ₀ ) + m ₁₂ (Y−Y ₀ ) + m ₁₃ ( Z−Z ₀ )} / {m ₃₁ (X−X ₀ ) + m ₃₂ (Y−Y ₀ ) + m ₃₃ (Z−Z ₀ )} (4)
V−V ₀ = −F · {m ₂₁ (X−X ₀ ) + m ₂₂ (Y−Y ₀ ) + m ₂₃ (Z−Z ₀ )} / {m ₃₁ (X−X ₀ ) + m ₃₂ (Y−Y ₀ ) + m ₃₃ (Z−Z ₀ )} (5)
Is obtained.

Equations (4) and (5) express the relationship between real space coordinates (X, Y, Z) and coordinates (U, V) in a general form. Therefore, if the same point is photographed by two cameras and two sets of (U, V) are actually measured, the equations for four X, Y, and Z are substituted into equations (4) and (5). Is obtained. If any three of these four equations are solved as simultaneous equations, the values of real space coordinates (X, Y, Z) are determined. However, in order that a camera constants in (4) and (5) (X0, Y0, Z0), (U0, _V0), it is necessary to know the values of _{m ij} and F. However, it is not easy to actually measure the values of these constants. In particular, it is extremely difficult to determine the direction of the optical axis that determines m _ij .

  On the contrary, even if the camera is set so that these constants have predetermined values, it is difficult unless a very special device is used in the laboratory.

  Therefore, in the DLT method, these camera constants are not directly obtained, but are expressed in an equation by actually measuring the coordinate values on the imaging surface of an image of a point (control point) whose coordinate value in the real space is known. The method of determining the constant is taken.

(2) Determination of coefficient If the camera constants are appropriately summarized in equations (4) and (5) and arranged for U, V and X, Y, and Z, the following equations (6) and (7) U = (A ₁ X + A ₂ Y + A ₃ Z + A ₄ ) / (C ₁ X + C ₂ Y + C ₃ Z + 1) (6)
V = (B ₁ X + B ₂ Y + B ₃ Z + B ₄ ) / (C ₁ X + C ₂ Y + C ₃ Z + 1) (7)
Is obtained.

Here, 11 constants A1 to A4, B1 to B4, and C1 to C3 are determined by camera constants. Therefore, when the equations (6) and (7) are solved with respect to these 11 constants, the following equations (8) and (9): A ₁ X + A ₂ Y + A ₃ Z + A ₄ −C ₁ XU−C ₂ YU− C ₃ ZU = U (8)
B ₁ X + B ₂ Y + B ₃ Z + B ₄ −C ₁ XV−C ₂ YV−C ₃ ZV = V (9)
Is obtained.

  These two equations are linear equations for 11 constants from A1 to C3. If six control points with known coordinate values in the real space and the measured values of the coordinates of the image on the imaging surface, in other words, six sets of (X, Y, Z) and (U, V) are obtained. For example, 12 equations can be obtained by substituting into these equations. If these are considered as simultaneous linear equations relating to eleven unknowns from eleven A1 to C3 among these, constant values from A1 to C3 can be obtained.

  If eleven constants from A1 to C3 are determined, the values of the actual coordinates (X, Y, Z) can be obtained because the coordinates (U, V) on the imaging surface are known.

Rewriting the equations (8) and (9) as equations relating to the equations X, Y, and Z, the following equations (10) and (11) (A ₁ −C ₁ U) X + (A ₂ −C ₂ U) Y + (A ₃ -C ₃ U) Z = UA ₄ (10)
(B ₁ −C ₁ U) X + (B ₂ −C ₂ U) Y + (B ₃ −C ₃ U) Z = U−B ₄ (11)
Is obtained.

(3) Method of calculating three-dimensional coordinates with one camera When the coordinates measured by the above-described equations (8) and (9) are included in the same plane, for example, if the measurement point is on the XY plane Assuming Z is a constant and can be ignored. If we set Z = 0 in Equation (8) and Equation (9),
A ₁ X + A ₂ Y + A ₄ -C ₁ XU-C ₂ YU = U (12)
B ₁ X + B ₂ Y + B ₄ −C ₁ XV−C ₂ YV = V (13)
Is obtained.

These two equations are linear equations for eight unknowns. If the actual coordinate values in the real space are four control points and the measured values of the coordinates of the image on the imaging surface, in other words, four sets of (X, Y, Z) and (U, V) are obtained. For example, eight equations can be obtained by substituting into these equations. If these are considered as simultaneous linear equations concerning seven unknowns from A1 to C2 of any seven of these, the values of unknowns from A1 to C2 can be obtained. If the unknown is found, formulas (8) and (9) are arranged for x and y,
(A ₁ + C ₁ U) X + (A ₂ + C ₂ U) Y = U−A ₄ (14)
(B ₁ + C ₁ U) X + (B ₂ + C ₂ U) Y = U−B ₄ (15)
Is obtained.

  In these equations (14) and (15), A1, A2, A4, B1, B2, C1, and C2 are known by coefficients, and U and V are also known by coordinates on the imaging surface. X and Y coordinates can be obtained by solving simultaneous equations related to Y.

Next, a procedure for attaching a mark to the face portion of the golf club head will be described.
FIG. 11 is a view showing the golf club head 100 before the face portion 101 is marked, and FIG. 12 is a view showing a sheet member used when the face portion 101 is marked. FIG. 13 shows golf club heads with these marks.

  One embodiment of the above-mentioned sheet member will be described. As shown in FIG. 12, the sheet member 105 includes three types of sheets: a driver sheet 105A, a fairway and utility club combined sheet 105B, and an iron club sheet 105C. It is a thing of the form affixed on the sheet | seat board | substrate which has the dimension of length L1: 88mm x width L2: 123.6mm.

  The driver's seat 105A has a size in which the head vertical direction: L3 is 54.6 mm, and the head horizontal direction: L4 is 88 mm. The center of the circle is located about 30 mm from the sheet center to the left and right on the vertical center line. Thick circles 110A and 110B of about 7.5 mm on the left and right sides, and about 7.5 mm of thick lines with the center of the circle about 20 mm above and below the center of the sheet on the center line in the horizontal direction. 110C and 110D are sheet members arranged vertically. The thick circle is preferably about 0.5 mm to 1.5 mm wide, more preferably about 1.25 mm wide.

  Further, the fairway and utility club combination sheet 105B has a size of 38.5 mm in the vertical direction L5 of the head and 69 mm in the horizontal direction L6 of the head, approximately 11.5 mm from the top and bottom sides in the vertical direction, and in the horizontal direction. There are four circles 110E, 110F, 110G, and 110H that are about 7.5 mm thick with the intersection at a position of about 15.5 mm from the right side direction and about 14.8 mm from the left side direction and the intersection point as the center of the circle. It is the sheet | seat member arrange | positioned.

  In order to align the leading edge of each golf club head at a position 3 mm from the bottom side, a thick line 115A having a length of 30 mm was placed in the left and right center. The width of the thick line is preferably about 0.2 to 0.6 mm because it can be distinguished from the thickness of the head score line and the thickness of the dimension line displayed on the sheet member. A thickness of about 0.5 mm is preferred.

  The iron club sheet has a size of 49.5 mm in the vertical direction of the head and 69 mm in the horizontal direction of the head, and is on a straight line passing through about 25 mm from the top side in the vertical direction and on a straight line passing through about 8.2 mm. The intersection point is a straight line passing about 9.5 mm from the side, a straight line passing about 12.3 mm from the right side direction of the left and right direction, and a straight line passing a position of about 11.6 mm from the left side direction. Is a sheet member in which thick circles of about 7.5 mm centering on the circle are arranged at four locations in the vertical and horizontal directions.

  In order to align the leading edge at a position 2 mm from the bottom side, a thick line 115B having a length of 38 mm was placed in the left and right center. The width of the thick line is preferably about 0.2 to 0.6 mm (preferably about 0.5 mm) because it can be distinguished from the thickness of the score line of the head and the thickness of the dimension line displayed on the sheet member.

  As shown in FIGS. 12 (A) and 12 (B), the sheet member is composed of three types of sheets, a driver sheet, a fairway and utility club combined sheet, and an iron club sheet. Although not shown in the figure, it may be divided into individual sheets.

  In the sheet member shown in FIG. 12B, the sheet member is a seal and can be fixed on the face portion 101 of the golf club head 100. For example, when marking the face part of the driver head, the sheet member is placed on the face part 101 with the center FC (FIG. 11) of the face part 101 aligned with the point C1 (FIG. 12) on the sheet member. Paste to. This alignment is performed while looking at the scale portions provided on the top, bottom, left and right of the point C1. Thereafter, the marking material adheres onto the face portion 101 by rubbing on the area of the sheet member where the marking material “DR” is provided, and a mark is formed on the face portion 101. Then, the sheet member is peeled off from the face portion 101. Thereafter, the sheet member can be used again when marking the face part of the fairway wood “FW” or the iron “IR”. In this way, a predetermined mark can be put on the face portion 101 by a simple method.

  In the sheet member, the marks 110A to 110L have a pattern in which the central portion is white and the peripheral portion is black. Thereby, it becomes easy to identify the mark even when disturbance such as sunlight enters. As a result, accurate measurement can be performed even outdoors.

  The above contents are summarized as follows. In other words, the golf club head behavior analysis device according to the present embodiment is a golf club head behavior analysis device that analyzes the behavior of the golf club head 100 at the time of shot by photographing the golf club head 100, The head speed detector 3 for detecting the head speed, and the laser beam 6 at least at two locations in the direction crossing the passing direction of the golf club 100 (arrow SW direction) on the rear side in the swing direction from the head speed detector 3 A trigger sensor that detects that each of the laser beams 6 has been blocked by the passage of the golf club, and a detection result of the trigger sensor as an input, and the swing speed and The swing direction is detected to determine whether or not a shot has been made. The shot determination means 11A, the at least two strobe illuminators 9B that can illuminate the golf club head 100 in a certain region in the swing direction at the time of the shot, and the timing according to the swing speed detected by the shot determination means 11A The strobe light emission setting means 12A that sequentially emits the plurality of strobe lighting devices 9B and the golf club head 100 irradiated by the strobe lighting device 9B are photographed at different positions in the region from different viewing angles, and are displayed on the photographing screen. At least two camera devices 9A that multiplex-shoot images of a plurality of golf club heads 100, and camera drive means 13A that performs shooting by the camera device 9A at a timing according to the swing speed detected by the shot determination means 11A; Taken by the camera device 9A Multiple capture a golf club head image information, comprising a head behavior calculating means 14A for determining the behavior of the golf club head 100 at the time of the shot, and output means 15 for outputting the operation result by the head behavior calculation means 14A.

  The golf club head behavior analysis device is detected by the head speed detector 3 and the strobe illuminator 10 </ b> B as at least two “other strobe illuminators” that can illuminate a certain region in the ball traveling direction immediately after the impact, and the head speed detector 3. Strobe light emission setting means 12B as “other strobe light emission setting means” for sequentially emitting light from a plurality of strobe lighting devices 10B at a timing according to the head speed, and a plurality of golf balls 5 irradiated by the strobe lighting device 10B in the above region. The camera device 10A as at least two “other camera devices” that shoots images from different directions at different viewing angles and multiplex-shoots images of a plurality of hitting balls in the shooting screen, and the heads for shooting by the camera device 10A Performed at the timing according to the head speed detected by the speed detector 3 The camera driving means 13B as the “other camera driving means” and a plurality of golf ball image information photographed by the camera device 10A are captured, and information including the flying ball direction and the flying distance is obtained by calculation based on the ball speed and rotation. And a hit ball state calculation means 14B to be obtained.

  As the golf club head 100, a golf club head having at least three marks (for example, marks 110 </ b> A to 110 </ b> D) having a luminance difference of a certain level or more with the face portion is applied. Then, the head behavior calculation unit 14A obtains at least one piece of information among the angle of the face surface at the time of shot, the hit point position, and the swing path. The laser beam 6 used in the trigger sensor 1 crosses the passing direction of the golf club while proceeding in a direction that becomes lower as it approaches the golfer.

  The golf club head behavior analysis method according to the present embodiment is a golf club head behavior analysis method for analyzing the behavior of the golf club head 100 at the time of shot by photographing the golf club head 100, and the head speed at the time of shot. The step (S1) of irradiating the laser beam 6 at least two places in the direction crossing the passing direction of the golf club on the rear side in the swing direction from the head speed detector 3 for detecting It is detected that the club has been blocked by passing the club, and the detection result is used as an input to detect the swing speed and the swing direction based on the speed and order in which the plurality of laser beams 6 are blocked, and determine whether or not a shot has been performed. Step (S2-1) and a certain region in the swing direction at the time of a shot A step (S5) of sequentially emitting at least two strobe illuminators capable of illuminating a golf club head included in the golf club at a timing according to a swing speed detected by the shot determination unit 11A, and at least two units With the camera device 9A, the golf club head 100 irradiated by the strobe illuminator 9B is photographed at a plurality of locations in the region from different directions at a timing according to the swing speed detected by the shot determination unit 11A. A step (S6) of taking a plurality of images of the plurality of golf club heads 100 in the photographing screen, and a plurality of pieces of golf club head image information photographed by the camera device 9A are taken in, and the behavior of the golf club head 100 at the time of the shot is taken. Obtaining steps (S7 to S10), And a step (S12) for outputting the behavior of the golf club head 100 during slot.

  According to the present embodiment, the presence / absence of a shot and the swing speed can be accurately detected by the trigger sensor 1, and the analysis of the head behavior can be started. And from the detection of the shot to the analysis of the behavior of the golf club head and its output can be performed fully automatically. As a result, it is possible to analyze the behavior of the golf club head 100 during a shot more easily and more accurately than in the past. Further, by obtaining information such as a flying ball direction and a flying distance by the hitting state calculation means 14B, it is possible to perform a comprehensive evaluation by linking the golf club head behavior analysis system and the golf ball trajectory analysis system. .

  An example of the head behavior analysis result will be described with reference to FIGS. In the present embodiment, the results of FIGS. 14 to 21 are automatically displayed.

  When actually analyzing the behavior, the user first selects whether the target club is a driver, a fairway wood, or an iron. For example, when a driver is selected, a club to be used is selected from a plurality of drivers. The selection is input to the behavior analysis apparatus from the input unit. Next, as an option setting, the light emission timing “fast / normal / slow” or the like is selected by the user. Then, a test strike is performed.

  FIG. 14 shows an example of an image of the golf club head 100 photographed with the strobe illuminator 9B. As shown in FIG. 14, images of a plurality of golf club heads 100 appear on the captured image.

  15 shows the state of the golf club head 100 viewed from above, and FIG. 16 shows the state of the golf club head 100 viewed from the side. These images show the tendency of each golfer's swing path (inside-out, outside-in).

  17 to 19 show the posture of the golf club head 100 at the moment of impact. From these images, the tendency of the face angle, blow angle, lie angle, and hitting point position (toe-heel direction, vertical direction) at the time of impact can be understood.

  FIG. 20 is a diagram showing the distribution of hit point positions. FIG. 20 shows the distribution of hit points when the same golfer hits a plurality of times using five types of clubs A to E. By displaying in this way, it is possible to grasp at a glance what kind of tendency appears at the hit point position when the golfer shots with each club. Also, when pressure-sensitive paper is pasted on the face part and hitting the ball to obtain the hitting point as in the past, it is time-consuming to change the pressure-sensitive paper each time a shot is taken or to collect multiple pressure-sensitive papers and add up the hitting point position. However, in this embodiment, such a complicated operation is not necessary.

  FIG. 21 shows the results of the swing path, face angle, blow angle, lie angle, and hitting point position when the same golfer hits a ball using the clubs A to E. By displaying as shown in FIG. 20, it is possible to grasp at a glance what kind of tendency appears in the behavior of the club head when the club A to the club E having different characteristics are shot. And it becomes easy to select a golf club suitable for the golfer.

  Note that the analysis data described above can be displayed in a table format instead of a graph format. In this case, not only the average value of the plurality of hits but also the analysis data for each shot can be displayed individually to check the variation in the numerical value for each shot.

  Although the embodiments and examples of the present invention have been described above, the embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a plan view showing a golf club head behavior analysis device according to one embodiment of the present invention. It is a figure which shows the state which looked at the club head behavioral analysis apparatus shown by FIG. 1 from the swing direction. It is a figure which shows the golf club head by which the mark was attached | subjected to the face part. It is a flow figure explaining a golf club behavior analysis method concerning one embodiment of the present invention. It is a flowchart explaining the flow of a golf ball trajectory analysis method. It is a front view which shows the form of the golf ball to which the mark was attached | subjected. It is a top view which shows the form of the golf ball to which the mark was attached | subjected. It is a figure which shows the form of the golf ball to which the mark immediately after a shot was attached | subjected. It is a figure which shows the form of the golf ball to which the mark immediately after a shot was attached | subjected. It is a figure for demonstrating DLT method. It is a figure which shows the golf club head before a mark is attached | subjected to a face part. It is a figure which shows the sheet | seat member used when attaching a mark to a face part. It is a figure which shows each golf club head by which the mark was attached | subjected to the face part. It is a figure which shows the example of the image of the golf club head image | photographed with flash. FIG. 6 is a diagram (part 1) illustrating an example of a head behavior analysis result. FIG. 9 is a second diagram illustrating an example of a head behavior analysis result. FIG. 6 is a diagram (part 3) illustrating an example of a head behavior analysis result; FIG. 6 is a diagram (part 4) illustrating an example of a head behavior analysis result; FIG. 10 is a diagram (part 5) illustrating an example of a head behavior analysis result; FIG. 10 is a diagram illustrating an example of a head behavior analysis result (part 6); FIG. 10 is a diagram (part 7) illustrating an example of a head behavior analysis result;

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Trigger sensor, 1A, 3A Laser light-emitting / receiving part, 2, 4 Laser reflector, 3 Head speed detector, 5 Golf ball, 6, 7 Laser beam, 8 Golfer's foot position, 9,10 Apparatus main body, 9A, 10A camera device, 9B, 10B strobe illuminator, 11A shot determining means, 11B head speed detecting means, 12A, 12B strobe light emission setting means, 13A, 13B camera driving means, 14A, 14B head behavior calculating means, 15 output means, 18 Large circle mark, 19 small circle mark, 100 golf club head, 101 face portion, 105 sheet member, 110A, 110B, 110C, 110D, 110E, 110F, 110G, 110H, 110I, 110J, 110K, 110L mark, 1000 mechanical Component, 2000 Signal processing system 2000A club head behavior analysis unit, 2000B golf ball trajectory analysis unit.

Claims (14)

A golf club head behavior analysis device that analyzes the behavior of the golf club head during a shot by photographing the golf club head,
A head speed detector that detects the head speed during a shot;
Laser light was irradiated at least at two locations in the direction crossing the passing direction of the golf club on the rear side in the swing direction from the head speed detector, and each of the laser lights was blocked by the passing of the golf club. A trigger sensor for detecting
Shot detection means for detecting whether or not a shot has been performed by detecting a swing speed and a swing direction based on a speed and a sequence in which a plurality of the laser beams are blocked, using the detection result of the trigger sensor as an input;
At least two strobe illuminators capable of illuminating a golf club head included in the golf club in a certain region in a swing direction at the time of a shot;
Strobe light emission setting means for sequentially emitting a plurality of the strobe illuminators at a timing according to the swing speed detected by the shot determination means;
At least two of the golf club heads illuminated by the strobe illuminator are photographed from different directions at different viewing angles at a plurality of locations in the region, and a plurality of images of the golf club heads are photographed in a photographing screen. A camera device;
Camera driving means for performing photographing by the camera device at a timing according to a swing speed detected by the shot determining means;
Head behavior calculating means for capturing a plurality of the golf club head image information photographed by the camera device and obtaining the behavior of the golf club head at the time of a shot;
A golf club head behavior analysis apparatus comprising: output means for outputting a calculation result by the head behavior calculation means.   The shot determining means determines that it is not a shot when a plurality of the laser beams are blocked at a constant speed or when the laser beams are not blocked from the side far from the golf ball toward the near side, The golf club head behavior analysis apparatus according to claim 1.   The golf club head behavior analysis according to claim 1 or 2, wherein at least three marks having a luminance difference of a certain level or more from the face portion are applied to the face portion as the golf club head. apparatus.   4. The golf club head behavior analysis device according to claim 1, wherein the head behavior calculation unit obtains at least one information of a face surface angle, a hit point position, and a swing path during a shot.   5. The golf club head behavior analysis device according to claim 1, wherein the display means is capable of displaying information obtained by the head behavior calculation means collectively in a plurality of strokes.   6. The golf club head behavior analysis device according to claim 1, wherein the laser beam used in the trigger sensor intersects with the passing direction of the golf club while traveling in a direction that becomes lower as approaching a golfer. . At least two other strobe illuminators capable of illuminating a certain area in the ball traveling direction immediately after impact;
Other strobe emission setting means for sequentially emitting a plurality of the other strobe illuminators at a timing according to the head speed detected by the head speed detector,
At least two other cameras that shoot golf balls irradiated by the other strobe illuminators from a plurality of locations in the area from different directions of viewing angles and multiplex-shoot images of a plurality of hitting balls in a shooting screen Equipment,
Other camera driving means for performing photographing by the other camera device at a timing according to the head speed detected by the head speed detector;
The golf ball further comprising: a hitting state calculation unit that takes in a plurality of the golf ball image information photographed by the other camera device and obtains information including a flying ball direction and a flying distance by a calculation based on a ball speed and rotation. The golf club head behavior analysis apparatus according to any one of claims 1 to 6.   The golf club head behavior analysis apparatus according to claim 7, wherein a golf ball having at least eight marks attached to the surface of the golf ball is applied as the golf ball. A golf club head behavior analysis method for analyzing the behavior of the golf club head during a shot by photographing the golf club head,
Irradiating laser light at at least two locations in the direction intersecting the passing direction of the golf club on the rear side in the swing direction from the head speed detector for detecting the head speed at the time of a shot;
Detecting that each of the laser beams is blocked by the passage of the golf club, using the detection result as an input, detecting a swing speed and a swing direction based on the speed and sequence in which the plurality of the laser beams are blocked, and shot Determining whether or not has been performed;
Sequentially emitting at least two strobe illuminators capable of illuminating a golf club head included in the golf club at a timing corresponding to the swing speed in a certain region in a swing direction at the time of a shot;
Photographing the golf club head irradiated by the strobe illuminator at a plurality of locations in the region from different directions of viewing angles at a timing corresponding to the swing speed with at least two camera devices, Multiplex shooting a plurality of golf club head images;
Capturing a plurality of the golf club head image information photographed by the camera device, and determining the behavior of the golf club head at the time of a shot;
A golf club head behavior analysis method comprising: outputting the behavior of the golf club head during a shot.   10. The golf club head behavior analysis method according to claim 9, wherein the golf club head is applied with at least three marks having a luminance difference of a certain level or more with respect to the face portion. Further comprising the step of attaching the mark to the face portion of the golf club head,
The step of attaching the mark includes
Preparing a sheet material with a marking material attached to a location corresponding to the mark;
Aligning a predetermined position in the sheet material with the center of the face portion so that the marking material and the face portion are in contact with each other;
The golf club head according to claim 10, further comprising: transferring and attaching the marking material attached to the sheet material to the face portion in a state where the predetermined position is aligned with the center of the face portion. Behavior analysis method.   A sheet material to which the marking material is attached, used in the golf club head behavior analysis method according to claim 11.   The sheet material according to claim 12, wherein the mark has a pattern in which a central portion is white and a peripheral portion is black.   The sheet material according to claim 12, wherein the mark includes a line that is aligned with a leading edge of the golf club head.

Images