Hitting position detecting device, hitting position detecting method, and method of manufacturing hitting position detecting device
First Claim
1. A hitting position detecting device comprising:
- a golf club which includes a shaft having a grip portion and a head portion having a face portion with a hitting surface and a rear surface and attached to the front end of the shaft;
at least three vibration wave sensors which are arranged on the side of the rear surface of the face portion and fixed to the head portion so as to output electrical signals in accordance with a vibration wave generated upon hitting of the face portion;
a calculation unit which detects arrival times in the vibration wave sensors of the vibration wave generated in the face portion upon hitting of a ball on the basis of the electrical signals, calculates a hitting position of the ball in the face portion on the basis of a difference in the plurality of arrival times, and then outputs the result as a hitting position signal;
a display unit which displays the hitting position in the face portion on the basis of the hitting position signal output from the calculation unit; and
a power source which supplies power to the vibration wave sensors, the calculation unit, and the display unit;
wherein the calculation unit detects a difference in arrival by setting two vibration, wave sensors as a pair, and calculates the hitting position on the basis of the difference in arrival time obtained by at least two pairs of vibration wave sensors.
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Accused Products
Abstract
A hitting position detecting device includes: a golf club which includes a shaft having a grip portion and a head portion having a face portion with a hitting surface and a rear surface and attached to the front end of the shaft; vibration wave sensors which is arranged on the side of the rear surface of the face portion and is fixed to the head portion so as to output electrical signals in accordance with a vibration wave generated upon hitting of the face portion; a calculation unit which detects arrival times in the vibration wave sensors of the vibration wave generated in the face portion upon hitting of a ball on the basis of the electrical signals, calculates a hitting position of the ball in the face portion on the basis of a difference in the plurality of arrival times, and then outputs the result as a hitting position signal; a display unit which displays the hitting position in the face portion on the basis of the hitting position signal output from the calculation unit; and a power source which supplies power to the vibration wave sensors, the calculation unit, and the display unit.
23 Citations
18 Claims
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1. A hitting position detecting device comprising:
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a golf club which includes a shaft having a grip portion and a head portion having a face portion with a hitting surface and a rear surface and attached to the front end of the shaft; at least three vibration wave sensors which are arranged on the side of the rear surface of the face portion and fixed to the head portion so as to output electrical signals in accordance with a vibration wave generated upon hitting of the face portion; a calculation unit which detects arrival times in the vibration wave sensors of the vibration wave generated in the face portion upon hitting of a ball on the basis of the electrical signals, calculates a hitting position of the ball in the face portion on the basis of a difference in the plurality of arrival times, and then outputs the result as a hitting position signal; a display unit which displays the hitting position in the face portion on the basis of the hitting position signal output from the calculation unit; and a power source which supplies power to the vibration wave sensors, the calculation unit, and the display unit; wherein the calculation unit detects a difference in arrival by setting two vibration, wave sensors as a pair, and calculates the hitting position on the basis of the difference in arrival time obtained by at least two pairs of vibration wave sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A hitting position detecting method comprising:
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hitting a ball by using a golf club which includes a shaft having a grip portion and a head portion having a face portion with a hitting surface and a rear surface and attached to the front end of the shaft; detecting each time at which a vibration wave generated in the face portion upon hitting of the ball arrives at vibration wave sensors which are arranged on the side of the rear surface of the face portion and is fixed to the head portion; calculating a hitting position of the ball in the face portion on the basis of each difference in arrival time of the vibration wave and outputting the result as a hitting position signal; and displaying the hitting position in the face portion on the basis of the hitting position signal; wherein the number of the vibration wave sensors is at least three, and the detection of the difference in arrival time is performed by at least two pairs of vibration wave sensors by setting two vibration wave sensors as a pair, and wherein the calculation of the hitting position is performed by the following steps; calculating Δ
L1=a×
Δ
T1+b on the assumption that(1) each difference when a first pair of the vibration wave sensors detects arrival of the vibration wave is denoted by Δ
T1,(2) each difference when a second pair of the vibration wave sensors detects arrival of the vibration wave is denoted by Δ
T2,(3) vibration propagation constants stored in advance in the calculation unit are denoted by a, b, c, and d, and (4) a difference in distance from each of the first pair of vibration wave sensors to an imaginary hitting position is denoted by Δ
L1;calculating Δ
L2=c×
Δ
T2+d on the assumption that(5) a difference in distance from each of the second pair of vibration wave sensors to the imaginary hitting position is denoted by Δ
L2;assuming that (6) a difference in distance obtained in advance from each of the first pair of vibration wave sensors to each position P in all areas having desired hitting positions on the face portion is denoted by Δ
Lp1, and(7) a difference in distance obtained in advance from each of the second pair of vibration wave sensors to each position P in all areas having desired hitting positions on the face portion is denoted by Δ
Lp2,wherein (8) the calculation unit obtains a position Ps by the following equation of
Ps=min{(Δ
Lp1−
Δ
L1)2+(Δ
Lp2−
Δ
L2)2}on the assumption that an operator min{ } denotes a position P where the value { } becomes minimum; and determining the position Ps to be the hitting position.
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18. A method of manufacturing a hitting position detecting device, comprising:
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installing three or more sensors in a rear surface as a back potion of a face portion in the vicinity of the contoured portion or the substantially outermost periphery of a hitting surface called the face portion of a golf club so as to detect a vibration wave generated upon hitting of a golf ball; installing a calculation processing unit which calculates minute differences in arrival times of the vibration wave generated upon hitting of the ball by using two pairs of sensors in which arbitrary two sensors are set as a pair, and a combination of one of the two sensors and another sensor or a combination of two sensors other than the two sensors is set as another pair; installing a calculation function microcomputer unit which substantially calculates the hitting position on the basis of the minute difference in times obtained by each of the pairs of sensors; installing a display unit in a shaft of the golf club so as to simultaneously display a hitting position and an approximate outer shape of the face portion; and installing a power supply for the microcomputer.
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Specification