JPH0478315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a golf swing measuring device, and more particularly to a device for measuring the actual lie angle of a golf club during a swing.

[Prior art and its problems]

A golf club is designed to have a predetermined lie angle with respect to the contact surface of the head. On the other hand, generally, at address, a player sets the golf club so that the lie angle of the golf club matches the designed lie angle, but when the player actually makes a swing, as shown in FIG. , the actual lie angle θ _L1 of the golf club 1 immediately before impact may not match the designed lie angle of the golf club. This may be caused by the fact that the designed lie angle of the golf club is not suitable for the player, or if the player's swing is not appropriate. Therefore, in order to check whether the designed lie angle of the golf club or the player's swing is appropriate, it is necessary to check the actual lie angle of the golf club immediately before impact during the swing.

On the other hand, if we strictly observe the lie angle of the golf club just before impact, as shown in Figure 9,
The shaft 2 of the golf club 1 causes vertical bending near the head 3, causing the shaft 2 near the head 3 to bend.
It is known that the lie angle θ _L2 of the shaft 2 is larger than the lie angle θ _L1 of the central portion of the shaft 2 or the designed lie angle. The causes of this are known to be vertical bending due to the action of centrifugal force, which occurs because the swing plane and the shaft axis of the golf club do not match, and vertical bending due to the gravity of the head.

FIG. 10 shows how vertical bending occurs due to centrifugal force. Referring to Figure 10,
Since the swing plane 4 and the axis of the shaft 2 of the golf club 1 do not coincide in an actual swing, when a centrifugal force F is generated outward from the swing plane, this centrifugal force F acts on the shaft 2.
At the connection between the shaft 2 and the head 3, the centrifugal force F can be decomposed into a force component _F1 in the axial direction of the shaft 2 and a force component _F2 in the direction perpendicular to the axis of the shaft 2. The latter force component F ₂ is one of the factors that causes the shaft 2 to bend vertically.

FIG. 11 shows the occurrence of vertical bending due to head gravity. Referring to Figure 11,
Gravity Wg acts on the head 3 attached to the tip of the shaft 2, and this gravity Wg can be decomposed into a component W ₁ g in the axial direction of the shaft 2 and a component K ₂ g in the direction perpendicular to the axis of the shaft 2. And the latter ingredient
W ₂ g is one of the factors that causes the shaft 2 to bend vertically.

As mentioned above, golf clubs tend to bend vertically near the head, so in order to determine whether the designed lie angle of the golf club is appropriate for the player, it is important to check the position near the head of the golf club just before impact. It is necessary to check the actual lie angle.

Until now, there was no device that could measure the actual lie angle of a golf club just before impact, so it was difficult to determine whether the player was making an appropriate swing or whether the designed lie angle of the golf club was appropriate for the player. It was not possible to quantitatively investigate whether or not this was the case.

Therefore, an object of the present invention is to provide a golf swing measuring device that can easily measure the actual lie angle of a golf club immediately before impact.

[Means for solving problems]

According to the present invention, there is provided a light-receiving unit configured by arranging at least two light-receiving units having a pair of front and rear light-receiving elements spaced apart in the horizontal direction and spaced apart in the vertical direction at a position facing a player who makes a swing. , a light emitting part that emits a beam of light toward each light receiving element along a straight line connecting a predetermined reference point and a pair of front and rear light receiving elements of each light receiving unit; a time measurement section that measures the time interval at which the golf club crosses each pair of front and rear rays toward the golf club; a calculation processing section that calculates the lie angle of the golf club based on the time interval data measured by the two light receiving units; and a calculation processing section. A golf swing measuring device is provided, which includes a display section that displays data calculated by the golf swing measuring device.

[Effect]

In the golf swing measuring device according to the present invention, when the player swings the golf club, the golf club crosses the light beam directed toward the front and rear pair of light receiving elements of each light receiving unit, and the front and rear pair of light receiving elements of each light receiving unit Detects the interruption of the light beam at the moment the club crosses it. and,
The time measurement section measures the time interval from the time when the rear light receiving element of the upper and lower light receiving units detects the interruption of the light beam to the time when the front light receiving element detects the interruption of the light beam, that is, the time interval when the golf club passes between the front and rear light beams. Measure the time it takes to Then, the arithmetic processing section calculates the lie angle of the golf club based on the time interval data measured for the two upper and lower light receiving units, and the display section displays the calculated lie angle.

If the golf club traverses the beam at the center portion of the shaft, the actual lie angle at the center portion of the shaft of the golf club can be measured and displayed by the golf swing measuring device. Further, when the golf club crosses the light beam near the head, the actual lie angle near the head of the golf club can be measured and displayed by the golf swing measuring device. In a preferred embodiment of the present invention, it is possible to simultaneously measure and display the actual lie angles at two locations on the golf club, for example, at the center of the shaft and at two locations near the head, using the golf swing measuring device. becomes.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show one embodiment of the present invention. First, referring to FIGS. 1 to 3, a support plate 12 erected on a base 11 to face a player who performs a swing includes:
A pair of front and rear light receiving elements 1 spaced apart in the horizontal direction
Two light receiving units 14, 15 with 6, 17
A light receiving section 13 is provided. The two light receiving units 14 and 15 are arranged on the support plate 12 at a predetermined distance from each other vertically. On the other hand, on the base 11 there is a predetermined reference point O and each light receiving unit 14,
A light emitting section 18 is provided that emits light toward the four light receiving elements 16 and 17 along a straight line connecting the pair of light receiving elements 16 and 17 in front and rear of the light receiving element 15 . Therefore, when the player swings the golf club 1 on the base 11, the golf club 1 crosses the light beam from the light emitting section 18 toward the four light receiving elements 16 and 17. In this case, the golf club 1 crosses the light beam heading towards the light receiving element 17 on the rear side of each light receiving unit 14, 15, and then crosses the light beam heading towards the light receiving element 16 on the front side. The light emitting section 18 and the light receiving section 13 are
Just before the golf club 1 reaches the ball impact position, the base 11 is arranged so as to cross the light beam heading towards the front light receiving element 16 of each light receiving unit 14, 15.
Preferably, it is placed on top.

Note that the light emitting section 18 may be configured so that the light beam emitted from one light source is split into four light beams (parallel spot light) by a lens unit and irradiated to each of the light receiving elements 16 and 17. It may be configured such that a light source irradiates each of the light receiving elements 16 and 17 with a light beam.

When the golf club 1 crosses the light beam, the light receiving elements 16 and 17 of each light receiving unit 14 and 15 detect the interruption of the light beam by the golf club 1. As schematically shown in FIG. 3, the golf swing measuring device operates from the time when the rear light receiving element 17 of each light receiving unit 14, 15 detects the interruption of the light beam to the time when the front light receiving element 16 detects the interruption of the light beam. The golf club 1 includes a time measurement unit 19 that measures each time interval between the two times, and further includes an arithmetic processing unit 20 that calculates the lie angle of the golf club 1 based on the data of the time intervals measured by the time measurement unit 19. It further includes a display section 21 that displays the lie angle calculated by the arithmetic processing section 20. It is preferable that the display unit 21 is placed, for example, in front of the support plate 12 so that the player can view the measured lie angle data immediately after making a swing.

Next, the calculation method by the calculation processing section 20 will be explained.

In Fig. 4, a pair of upper and lower light receiving units 1
If the pair of light receiving elements 16, 17 in front and rear of 4, 15 are denoted by A to D, then the light beam will be transmitted between the reference point O and the light receiving elements A to D.
The light is emitted toward the light receiving elements A to D along the straight line connecting the light and the light receiving elements A to D. Reference O and upper light receiving element A,
Let θ ₁ be the angle that the straight line connecting the reference point O and the lower light-receiving elements C and D makes with the reference plane, _e.g. do.

The points where the golf club crosses the four rays when making a swing are A ₂ , B ₂ , C ₁ , D ₁ , respectively.
Then, the plane surrounded by the four points A ₂ , B ₂ , C ₁ , and D ₁ becomes the plane through which the golf club passes. The passing time of the golf club between A ₂ and _{B 2} , that is, the time interval from the time when the upper ray is blocked to the time when the front ray is blocked, is T _AB , and the passing time of the golf club between C ₁ and _{D 1} Let time be T _CD . These transit times T _AB ,
T _CD is measured by the time measuring section 19.
Referring to FIG. 4, the ratio of the two transit times T _CD and T _AB can be approximated as T _CD / _TAB ≒L _C1D1 /L _A2B2 ≒L ₁ /L ₂ (1) .

In FIG. 5, the angle θ _L formed by the line segment B ₂ D ₁ with respect to the reference plane (horizontal plane) corresponds to the lie angle of the golf club. In Figures 4 and 5, when the relationship between the angles θ ₁ and θ ₂ and the lie angle θ _L is determined geometrically and the above formula (1) is substituted, θ _L = tan ^-1 tan θ ₁ -T _CD /T _AB tanθ ₂ / _T CD/T _AB −1…
(2) Alternatively, the relational expression θ _L =tan ⁻¹ T _AB tanθ ₁ −T _CD tanθ ₂ /T _CD −T _AB …(3) can be obtained. Here, since the angles θ ₁ and θ ₂ are constants determined by the arrangement of the light emitting part and the light receiving element, the transit time obtained by the time measurement part 19
When the values of T _CD and T _AB are given to formula (2) or formula (3),
The lie angle θ _L of the golf club in section _{2 1} ( _{2 1} ) can be determined.

Lie angle θ _L calculated by the arithmetic processing unit 20
The data is displayed on the display section 21.

When the golf club 1 crosses the light beam at the center of the shaft 2, like the golf club 1 on the left side in _FIG . The lie angle θ _L1 ) in FIGS. 8 and 9 can be measured and displayed using a golf swing measuring device. Also,
When the golf club 1 crosses the light beam near the head 3, as in the case of the golf club 1 on the right side of FIG. 1, the actual lie angle θ _L of the golf club 1 near the head 3 (in FIG. The lie angle θ _L2 ) can be measured and displayed using a golf swing measuring device.

6 and 7 show other embodiments of the present invention. In these figures, the same reference numerals are given to the same components as in the above embodiment.

In this embodiment, the light receiving section 13 includes four light receiving units 14, 15, 14', 15', and each light receiving unit 14, 15, 14', 15' is arranged in a pair of front and rear units spaced apart horizontally. It has light receiving elements 16 and 17.

In this embodiment, when the golf club 1 swings, the golf club 1 detects the light receiving elements 16 and 17 of the upper light receiving units 14 and 15 at two locations.
The upper four rays heading towards the lower light receiving unit 1
4', 15', and the lower four light rays heading towards the light receiving elements 16, 17, respectively. Therefore, the light receiving section 18 and the light receiving units 14, 15, 14',
15' and the swing position of the golf club 1, the lie angle θ _L at the approximate center of the shaft 2 of the golf club 1 (the lie angle θ _L1 in FIGS. 8 and 9) and the golf It becomes possible to simultaneously measure and display the lie angle θ _L (lie angle θ _L2 in FIG. 9) near the head 3 of the club 1.

In this case, from the light emitting unit 18 to each light receiving element 16,1
Let O be the emission reference point of the light beam emitted towards 7, and the angle that the straight line connecting the light receiving elements 16 and 17 of the upper two light receiving units 14 and 15 and the reference point O make with the reference plane (for example, horizontal plane). θ ₁ and θ ₂ , and the light receiving elements 1 of the lower two light receiving units 14' and 15'
If the angles that the straight lines connecting 6, 17 and the reference point O make with the reference plane are θ ₁ ', θ ₂ ', then these angles θ ₁ , θ ₂ ,
Since θ ₁ ′ and θ ₂ ′ are constants, the lie angle θ _L of the central portion of the shaft 2 of the golf club 1 depends on the angles θ ₁ , θ ₂ and the upper light receiving units 14 and 1.
It can be calculated by the above formula (2) or formula (3) based on data of the passing time of the golf club 1 measured for
For the lie angle θ _L near head 3 of , the formula
(2) or by giving angles θ _{1 ′} and θ ₂ ′ to the angles θ ₁ and θ ₂ in equation (3), and calculating the passing time of the golf club 1 measured for the lower light receiving units 14 ′ and 15 ′. It can be similarly calculated by applying the data to the above formula (2) or formula (3).

Although the illustrated embodiments have been described above, the present invention is not limited to the embodiments described above. For example, the number of light receiving units having a pair of front and rear light receiving elements can be changed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to provide a golf swing measurement device that can easily measure and display the actual lie angle of the golf club immediately before the ball impact during the swing. It becomes possible to quantitatively check whether the player is making an appropriate swing or whether the designed lie angle of the golf club is appropriate for the player.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a golf swing measuring device showing an embodiment of the present invention, FIG. 2 is a plan view of the measuring device shown in FIG. 1, and FIG. 3 is a configuration block of the measuring device shown in FIG. 1. 4 and 5 are diagrams for explaining the method of calculating the lie angle of a golf club, FIG. 6 is a perspective view of a golf swing measuring device showing another embodiment of the present invention, and FIG. The figure is a block diagram of the measuring device shown in Figure 6, Figure 8 is a diagram showing the lie angle of the golf club during swing, and Figure 9 is the change in lie angle caused by the vertical bending of the golf club during swing. The diagrams illustrating the state, FIG. 10 and FIG. 11 are diagrams for explaining the causes of vertical bending of the golf club, respectively. In the figure, 11 is a base, 12 is a support plate, 13
14, 5, 14', 15' are light receiving units, 16, 17 are light receiving elements, 18 is a light emitting part, 19
Reference numeral 20 indicates a time measuring section, 20 indicates a calculation processing section, and 21 indicates a display section.

Claims (1)

[Scope of Claims] 1. A light-receiving unit configured by arranging at least two light-receiving units having a pair of front and rear light-receiving elements spaced apart in the horizontal direction and spaced apart in the vertical direction at a position facing a player who makes a swing. a light emitting section that emits a beam of light toward each light receiving element along a straight line connecting a predetermined reference point and a pair of front and rear light receiving elements of each light receiving unit; a time measurement unit that measures the time interval at which the golf club crosses each pair of front and rear rays directed toward the front and back; an arithmetic processing unit that calculates the lie angle of the golf club based on time interval data measured by the two light receiving units; A golf swing measuring device comprising: a display section that displays data calculated by a processing section. 2 The light receiving section is equipped with four light receiving units,
The arithmetic processing section simultaneously measures lie angles at different locations on the golf club based on the time interval data measured by the upper two light receiving units and the time interval data measured by the lower two light receiving units. A golf swing measuring device according to claim 1, characterized in that the golf swing measuring device is configured as follows.