A stiffness characteristic measurement device holds a golf club head with a face surface facing upward, drops a collision rod vertically toward the face surface, and calculates the stiffness characteristic of the golf club head based on a detection value of an accelerometer attached to the collision rod. Every time the measurement point on the face surface is changed, a drop distance changing step of adjusting the drop distance of the collision rod is performed so that the collision velocity of the collision rod to the measurement point is substantially constant.
G01N 3/303 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force generated only by free-falling weight
G01M 5/00 - Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings
A golf club includes a reinforcing member installed on an inner circumferential surface of a shaft near a tip-side end portion and extends in an axial direction of the shaft to straddle an upper end of a cylindrical portion. The reinforcing member has a cylindrical shape configured by laminating prepregs obtained by impregnating carbon fibers being reinforcing fibers with a matrix resin. The reinforcing member is provided with: a first bias layer located at the innermost side in a radial direction; a second bias layer laminated on an outer side of the first bias layer (16A) in the radial direction, an orientation direction of the reinforcing fibers having an opposite direction to the first bias layer; and a straight layer laminated on the outer side of the second bias layer in the radial direction, an orientation direction of the reinforcing fibers being parallel to the axial direction of the shaft.
Provided is a rigidity characteristics measuring device that measures the rigidity characteristics of a golf club head. A head fixing jig holds the golf club head with a face surface facing upward. A linear bushing causes an impact rod to drop vertically toward the golf club head. The impact rod is equipped with an acceleration sensor. A computer calculates the rigidity characteristics, e.g., a CT value, of the golf club head, based on a detected value of the acceleration sensor.
A system for measuring rigidity characteristics that measures a CT value of a golf club head based on an acceleration occurring in an impactor when the impactor is caused to strike the golf club head. Correlation data is calculated by measuring a representative CT value of the golf club head, which is calculated based on CT values measured multiple times by changing the impact velocity of the impactor, and a test velocity CT value, which is a CT value when the impact velocity is set to a predetermined test velocity, for each of a plurality of the golf club heads of an identical model. A rigidity characteristic value measuring device measures the test velocity CT value for another golf club head of the model. A computer estimates the representative CT value of the other golf club head based on the test velocity CT value and the correlation data.
A63B 60/42 - Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
G01N 3/303 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force generated only by free-falling weight
G01N 3/48 - Investigating hardness or rebound hardness by performing impressions under impulsive load by indentors, e.g. falling ball
G01P 3/66 - Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means
G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups
5.
RIGIDITY CHARACTERISTIC MEASUREMENT METHOD AND RIGIDITY CHARACTERISTIC MEASUREMENT DEVICE
A rigidity characteristic measurement device 10 holds a golf club head 30 with a face surface 32 facing upward, vertically drops a collision rod 24 toward the face surface 32, and calculates the rigidity characteristics of the golf club head 30 on the basis of the detection value of an acceleration sensor 26 fitted to the collision rod 24. Every time the measurement place on the face surface 32 is changed, a dropping distance changing step is performed for adjusting the dropping distance of the collision rod 24 so as to keep roughly constant the colliding speed of the collision rod to the measurement place.
G01N 3/30 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force
G01N 3/303 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force generated only by free-falling weight
6.
TRIAL HIT DATA ACQUIRING SYSTEM, AND TRIAL HIT DATA ACQUIRING METHOD
This trial hit data acquiring system is provided with: a trial hit measuring device for measuring the behavior of a golf club or a golf ball; a feature point detecting sensor for detecting the occurrence of a feature point in a golf swing; a processing device for calculating trial hit data from the measurements by the trial hit measuring device; and an image capturing device for capturing an image of a golf club head prior to impact. In the processing device, the type of the golf club is identified by extracting first appearance characteristic information of the golf club head from an image for which a time difference between the timing of the detection of the feature point based on a detection signal from the feature point detecting sensor, and the timing of the image capture of the golf club head lies in a prescribed range. The determined type of the golf club and the trial hit data obtained from the measuring device are associated with one another, and the trial hit data are recorded and stored.
A swing measurement system measures an evaluation index of a swing of a golf club using an inertial sensor. A computer is provided with: a movement trajectory calculation unit for calculating a movement trajectory of the golf club during the swing using a detection value of the inertial sensor; a shaft plane calculation unit for calculating a shaft plane of the swing based on the movement trajectory in a freely selectable section of the swing; and an angle calculation unit for calculating, as the evaluation index, a shaft plane angle formed between the face surface of the golf club and the shaft plane.
A63B 69/36 - Training appliances or apparatus for special sports for golf
A63B 60/46 - Measurement devices associated with golf clubs, bats, rackets or the like for measuring physical parameters relating to sporting activity, e.g. baseball bats with impact indicators or bracelets for measuring the golf swing
A63B 24/00 - Electric or electronic controls for exercising apparatus of groups
A stiffness characteristic measuring device 10 measures the stiffness characteristics of a golf club head 30 (subject of impact). A head-fixing jig 12 holds the golf club head 30 so that a face surface 32 thereof faces upwards. A linear bushing 22 allows an impact rod 24 (impacting body) to fall vertically towards the golf club head 30. An acceleration sensor 26 is attached to the impact rod 24. On the basis of the values detected by the acceleration sensor 26, a computer 50 calculates the stiffness characteristics, a CT value for example, of the golf club head.
A63B 60/42 - Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
G01N 3/30 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force
G01N 3/303 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force generated only by free-falling weight
A rigidity characteristic measurement system 10 measures a CT value of a golf club head 30, on the basis of an acceleration generated in a collision object when the collision object is made to collide with the golf club head 30. Correlation data 12 is data calculated by measuring, for a plurality of golf club heads 30 of the same model, a representative CT value of the golf club head 30 which is calculated on the basis of CT values measured multiple times while changing the collision speed of the collision object, and a test speed CT value which is a CT value when the collision speed is set to a predetermined test speed. A rigidity characteristic value measurement device 14 measures the test speed CT value for other golf club heads 30 of the abovementioned model. A computer 16 estimates, on the basis of the test speed CT value and the correlation data 12, a representative CT value of the other golf club heads 30.
A63B 60/42 - Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
G01N 3/30 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force
G01N 3/303 - Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force generated only by free-falling weight
This swing measurement system 10 measures an evaluation index for a swing of a golf club 20 using an inertial sensor 12. A computer 14 is provided with: a movement trajectory calculation unit 62 for calculating the movement trajectory of the golf club 20 during the swing using a detection value of the inertial sensor 12; a shaft plane calculation unit 64 for calculating a shaft plane SP for the swing on the basis of the movement trajectory in any segment of the swing; and an angle calculation unit 66 for calculating, as the evaluation index, a shaft plane angle θ formed between the face surface of the golf club 20 and the shaft plane. The swing measurement system measures the swing evaluation index of a golf club which takes the shaft plane into account.
A63B 69/36 - Training appliances or apparatus for special sports for golf
A63B 60/46 - Measurement devices associated with golf clubs, bats, rackets or the like for measuring physical parameters relating to sporting activity, e.g. baseball bats with impact indicators or bracelets for measuring the golf swing
11.
MEASUREMENT MARKER AND METHOD FOR MEASURING BEHAVIOR OF MOVING BODY USING MEASUREMENT MARKER
The present invention reduces the number of steps required for measuring the behavior of a moving body. A measurement marker 10 is used in a method for measuring behavior of a moving body, the method comprising setting feature points on the surface of the moving body such as a golf club head 30, extracting the feature points from successively captured images of the moving body in motion, and measuring the behavior of the moving body in motion on the basis of temporal changes of positions of the feature points. In the measurement marker 10, three feature points 12A to 12C or more are nonlinearly arranged on a planar base material 1002, and an adhesive material (adhesive layer 1004) is disposed the surface through which the base material 1002 is attached to the moving body.
G01B 11/26 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes
A63B 69/36 - Training appliances or apparatus for special sports for golf
G01B 11/00 - Measuring arrangements characterised by the use of optical techniques
The purpose of the present invention is to suppress twisting of a shaft when hitting a ball, as well as improve durability of the shaft while reducing the weight of a reinforcing member. A reinforcing member 16 is attached to an inner peripheral surface 1204 of a shaft 12 near a tip side end section 18, and extends in the axial direction of the shaft 12 so as to straddle an upper end 2810 of a tubular section 28. The reinforcing member 16 has a cylindrical shape configured by laminating prepregs obtained by impregnating carbon fibers being reinforcing fibers 30 into a matrix resin. The reinforcing member 16 is provided with: a first bias layer 16A located at the innermost side in the radial direction; a second bias layer 16B laminated on the outer side of the first bias layer 16A in the radial direction, the orientation direction of the reinforcing fibers 30 facing the opposite direction to the first bias layer 16A; and a straight layer 16C laminated on the outer side of the second bias layer 16B in the radial direction, the orientation direction of the reinforcing fibers 30 being parallel to the axial direction of the shaft.
In order to reduce the influence of a reflection member on a captured image in an imaging device that controls imaging timing using a regressive reflection type optical sensor, an imaging device 10 is provided with: a regressive reflection type optical sensor 12 that is provided with a sensor light projection unit 1202A, a light reception unit 1202B, a reflection member 1204 and a detection unit 1206, and detects the entry of an object into a detection range; and a camera 1406 that has, as an imaging range, a region including a direction in which the object is expected to move, and starts imaging with the detection of the object by the regressive reflection type optical sensor 12 as a trigger. A first filter 1210 including a first wavelength in the transmission wavelength band thereof is attached to the surface of the reflection member 1204, and the camera 1406 captures an image via a second filter including a second wavelength different from the first wavelength in the transmission wavelength band thereof.
In order to easily and precisely control imaging timing when capturing images of a moving object, an imaging device 10 comprises: an imaging unit 12 that captures images of a moving golf ball 20; a reflective optical sensor 14 that detects the presence of the golf ball 20 inside a detection range; and an imaging control unit 182. After detecting a golf ball 20 inside the detection range above a tee 24, the imaging control unit 182 controls the imaging timing for the imaging unit 12, if departure by the golf ball 20 from the detection range is detected and using the timing of the departure as a reference. The detection range of the reflective optical sensor 14 is set, for example, above the tee 24.
In order to accurately provide swing characteristics that affect the position of impact on a golf ball, a two-dimensional coordinate axis, a plurality of areas, and a measurement point are displayed on a display screen of a display 46, said two-dimensional coordinate axis indicating a left-right approach angle θ and a strike face angle φ, said plurality of areas being divided taking into account the shift amount ΔS estimated from the left-right approach angle θ and the strike face angle φ and in accordance with the trend for the course of the golf ball 2, and said measurement point measuring the behavior of a golf club head 16 when actually swung by a golfer. A slice area A1, a fade area A2, a straight area A3, a draw area A4, and a hook area A5 are displayed as the plurality of areas, thereby enabling the effect of swing characteristics such as a slice or a hook, etc., on the course of the ball to be easily provided and readily understood, on the basis of which area the measurement point is positioned in, and thereby making the present invention even more useful.
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