JPS6138714B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a detection element for detecting the movement status of the head of a golf club, and particularly in the case of a club such as an iron having a magnetic head, the detection element can detect the movement of the head of a golf club without any special device being provided to the club. The present invention relates to a golf practice machine having a detection element configured to detect the movement status of a club.

Embodiments of the present invention will be described below based on the drawings.
In FIGS. 1 to 4, 1 is a golf club such as an iron having a club head 2 made of a magnetic material, 3 is a golf mat, and 4 is a recess for inserting a detection element, which will be described later, so that they are mutually aligned in the correct swing direction. A plastic base is precision-machined at two locations spaced apart by a distance L and at a location spaced a distance D from the one recess in the direction perpendicular to the swing direction; 6 is a signal cable that transmits the signal from the detection element to the calculation device 5; 7 is a golf ball; The base 4 detects the signal change and outputs a signal for detecting the movement status of the club head 2 to the arithmetic unit 5.
a detection element that is fitted and fixed in a recess provided in 9;
is a permanent magnet that constitutes the detection element 8 and serves as a signal generating section such as a magnetic flux generating section that sends magnetic flux to the club head 2;
Reference numeral 10 denotes a magnetic flux search coil as a detection part of a magnetic sensor, etc., which detects temporal changes in magnetic flux due to mutual interference between the permanent magnet 9 and the moving club head 2 and outputs a voltage. The magnet 9 is wound around the permanent magnet 9 and is integrally attached to the permanent magnet 9.

The operation of this configuration will be explained with reference to FIGS. 5 and 6.

First, the function of the detection element 8 in the present invention will be explained based on FIG. 5. For example, if the upper end of the permanent magnet 9 is the N pole, the club head 2 will be attached to the permanent magnet 9.
The end face of the side is magnetized to the S pole, and the magnetic flux from the end face crosses the magnetic flux search coil 10 and the magnetic flux search coil 1
A voltage e _p is generated between the terminals 0 and 0.

This voltage e _p is expressed as e _p =-NvhAdB/dy.

Here, N is the number of turns of the search coil, A is the effective cross-sectional area of the search coil, vh is the moving speed of the magnetized club head, B is the magnetic flux density at the center of the search coil, and y is the coordinate axis taken in the swing direction of the club head. .

The relationship between this voltage e _{p and} the position of the moving club head 2 is as shown in FIG. It is represented by a waveform in which the voltage e _p is zero at the position 2b and the voltage e _p is minimum at the club head position 2c.

Based on the detection element 8 having such characteristics, FIG. 3 shows a method of detecting the movement status of the golf club 1 from the voltages e _a , e _b , e _c of the respective detection elements 8 when the golf club 1 is swung. This will be explained based on FIG. For example, if the face of the club head 2 during the swing is tilted x ⁰ with respect to the face during the correct swing, the voltages e _a , e _b , e
The waveform _c generates voltages e _a , e _b , and e _c in order. Based on these waveforms, if the time difference between the voltage e _a waveform and the voltage e _b is tv ₁ , the moving speed vh of the club head 2 is
vh=L/tv ₁ , and further voltage e _a waveform and voltage e _c
If the time difference with the waveform is tv ₁ , the inclination of the face plane X ⁰ is x=tan ^-1 {L・(tv ₂ − tv ₁ )/D・tv ₁
} becomes.

The arithmetic unit 5 operates according to the above-mentioned flow, which calculates the transition between the zero points of the voltages e _a and e _b and between the zero points of the voltages e _a and e _c from the clock pulse of the crystal oscillator having a precise natural frequency. time i.e. tv ₁ and tv ₂
These values are then substituted into the arithmetic circuit for calculating vh and x to calculate and display the moving speed of the club head 2 and the inclination angle of the club face.

As described above, in the case of a golf club such as an iron having a club head made of a magnetic material, the permanent magnet 9 of the detection element 8 magnetizes the club head 2, and the club head 2 is magnetized by this magnetization without any special device being provided to the club. The magnetic flux from the magnetic flux is detected by the magnetic flux search coil 10, and the mutual positional relationship of the detection elements 8 can be determined relatively precisely.
It is easy to use and allows for highly accurate measurements.

On the other hand, as shown in FIG. 7, in the case of a golf club 1' such as a wood golf club having a club head 2' made of a non-magnetic material, a magnetic material or a rubber magnet magnetized in a direction that assists the magnetic flux generating part is attached to the club head 3'. If a permanent magnet 21 such as the above is attached, the swing speed, movement speed, and direction can also be measured.

In the above embodiment, a detection element consisting of a permanent magnet and a magnetic flux search coil was used as the detection element, but the detection element is composed of an excitation coil, that is, an iron core and a coil, and the detection element is generated by passing a constant DC current through it. The moving speed and direction may be measured from the pulsating component, and any magnetic sensor that responds to magnetism, such as a Hall element, may be used instead of a magnetic flux search coil.

In addition, if the magnetic sensor of the detection element is affected by induction noise in the atmosphere such as high-voltage power distribution lines or induction noise from the human body, the eddy current that causes the waveform to be disturbed as described above may be weak. Either a non-magnetic or conductive metal foil is glued to plastic to form a noise shielding plate, and this plate is attached to a magnetic sensor to minimize noise, or a non-magnetic or conductive metal is plated on the plastic to reduce the noise. A shielding plate may also be configured. In this way, measurement accuracy is further improved.

Further, the signal generating section does not have to be a magnetic generating section, but may be a sound wave generating source that generates sound waves, and the speed and direction of movement of the golf club can be measured using the Doppler effect of the sound waves.

As explained above, according to the present invention, the movement status of the club head having at least a part of the magnetic material can be controlled by the interaction between the signal generating section and the moving magnetic material and the signal generating section, which are integrated with the signal generating section. Since the configuration is such that the detection is performed by a detection element consisting of a detection section that detects signal time changes due to interference, for example, in the case of a golf club such as an iron equipped with a magnetic club head, there is no need to install any special equipment on the golf club. At least the moving speed and direction of the golf club can be detected. In addition, since the detection element is constructed by integrating the signal generation section and the detection section, it is extremely easy to install, and there is no relative deviation between the detection section and the signal generation section, improving measurement accuracy. You can also do that.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a golf practice machine that is an embodiment of the present invention, and FIG. 2 is a sectional view of essential parts of the same practice machine.
Figure 3 is a diagram showing the arrangement of the detection elements of the same training aircraft as above;
FIG. 4 is an enlarged perspective view of the above detection element, FIG. 5 is a diagram explaining the characteristics of the above detection element, FIG. 6 is a characteristic diagram of the same detection element, and FIG. 7 is a diagram showing a modification of the present invention. be. 1...Golf club, 2...Club head, 4
... Base, 5 ... Arithmetic device, 8 ... Detection element, 9
...Permanent magnet, 10...Magnetic flux search coil.

Claims (1)

[Scope of Claims] 1. A golf club equipped with a club head having at least a portion of a magnetic material, and a base that detects signal time changes due to movement of the club head and outputs a signal for detecting movement status of the club head. In a golf practice machine equipped with detection elements provided at a plurality of locations and reporting means for reporting the movement status based on signals from the detection elements, the detection elements are used to send signals to the magnetic body portion of the club head. A golf ball characterized by comprising: a signal generating section that transmits a signal; and a detecting section that is integrally formed with the signal generating section and detects a signal time change due to mutual interference between the moving magnetic body and the signal generating section. Training machine. 2. Golf practice according to claim 1, characterized in that the detection element, which is constructed by integrating the signal generation part and the detection part, is fitted and fixed in a predetermined recess of a molded base. Machine. 3. Golf practice according to claim 1 or 2, wherein the signal generating section is a magnetic flux generating section that sends magnetic flux to the magnetic material section, and the detecting section is a magnetic sensor that detects changes in magnetic flux over time. Machine. 4. The golf practice machine according to claim 3, wherein the magnetic flux generating section and the magnetic sensor are excitation coils that have both functions. 5. Golf practice according to any one of claims 1 to 4, characterized in that the detection part is equipped with a noise shielding plate made of non-magnetic metal or non-magnetic metal plating to protect from induced noise. Machine.