JPS6339268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stroke counter for a racket, particularly for a racket equipped with a gut such as a tennis racket or a badminton racket.

In recent years, an extremely large number of people have taken up sports to improve their health or as a hobby, and in particular, racket sports such as tennis and badminton have become extremely popular as they can be easily enjoyed by anyone. However, for lovers of these sports, it is important to exercise in order to digest the required amount of exercise per day, to know the amount of practice required to improve technique, or to prevent so-called tennis elbow. It is desirable to know exactly how many balls and shuttles are being hit in order to avoid overdoing it. Furthermore, it is extremely important to know the number of strokes, especially the cumulative number of strokes, as it helps to know the degree of deterioration of the racket, or in other words, the lifespan of the racket.

Of course, this counting of the number of at-bats can be done by the player himself, but for players who are passionate about playing, counting and remembering it is extremely troublesome, and on the contrary, it detracts from the interest of the sport. It was hot.

Also, for players, an important concern is whether or not they caught the ball in the part of their gut that has the strongest repulsive force, the so-called sweet spot.
There is a long-awaited method for knowing this accurately.

The present invention was proposed in view of the above points, and its purpose is to convert the reaction force of the gut when hitting a ball etc. into an electrical signal, count and display this, and thereby constantly keep track of the number of hits. To provide a counter for the number of hits of a racket which can accurately know the number of hits and also determine whether or not the ball has been hit at the sweet spot as necessary.

The present invention will be explained below with reference to the drawings.

Figure 1 shows a tennis racket R to which the present invention is applied.
The racket R includes a frame 1 having a substantially elliptical shape, guts 2 stretched in a grid pattern on the opening surface of the frame 1, and a shaft 3 extending integrally with the frame 1. and a grip 4 provided on the lower end side of the shaft 3. As shown in FIG. 2, a piezoelectric element 6 made of ceramic is disposed as a detection element in the central portion 1a of the frame 1 on the shaft 3 side that receives the vertical gut 2. As shown in FIG.

That is, in FIG. 2, the gut 2 is
a and the gut guide 5 superimposed on the outside of the central portion 1a, but the central portion 1a and the gut guide 5 within the folded portion of the gut 2
A piezoelectric element 6 is disposed between the two.

Next, FIG. 3 shows a block diagram of an electronic circuit as a counter, in which 7 is a power source such as a battery, 8 is a filter, 9 is an amplifier circuit, 1
0 is a comparator, 11 is a counter, 12 is a driver for driving a display element, 13 is a digital display element using EL, liquid crystal, etc., 14 is a reset button provided at the grip end of the racket R, and 15 is a reset circuit. shown respectively. The electronic circuit is housed in a case 16 that is integrally attached to the grip end 4a as shown in FIG. 4, and the display element 13 is disposed on the end surface of the grip end 4a.

Next, this operation will be explained. First, when the ball is hit by the gut 2, a reaction force is applied to the gut 2, which compresses the piezoelectric element 6 and generates an electric signal. The output electrical signal is passed through filter 8
is amplified by an amplifier circuit 9 via a comparator 10.
added to. This comparator 10 compares a preset reference voltage with the output voltage of the amplifier circuit 9, and outputs a pulse signal to the subsequent counter 11 in order to count only the electric signal based on the impact when the ball is truly hit. do. counter 1
1 counts this pulse signal, drives the display element 13 via the driver 12, and digitally displays the counted number. Further, if necessary, the count value of the counter 11 can be reset by the reset circuit 15 by pressing the reset button 14 after the end of play.

Next, FIG. 5 shows a number of strokes display board 17 in another embodiment of the present invention. In this example,
The piezoelectric element 6 described above is installed close to the center position of the vertical gut 2 and the guts 2 on both sides shifted by the radius of the ball from the central position of the vertical gut 2.
It is installed close to the gut 2 at the center position and at positions on both sides shifted by the radius of the ball. Similarly to the above, the reaction force of the gut 2 is taken out as a voltage, and among the three outputs applied to the vertical gut 2, the center one is the maximum, and the three outputs applied to the horizontal gut 2 are
It is determined by the comparator 10 of the electronic circuit shown in FIG. 3 that the center of the two outputs is the maximum, in other words, that the ball was hit at the sweet spot, and in this case, the display board 1 shown in FIG.
In other cases, an "X" is displayed on the sweet shot display section 18b. Also, in Figure 5, 1
3a is a display element with only sweet shot numbers, 13
b indicates a display element for all shot numbers, that is, the cumulative number of strokes. It should be noted that the display board 17 is also provided at the grip end portion 4a. According to this embodiment, it is possible to accurately know the success or failure of a sweet shot and the number of strokes, allowing for intensive practice.

As described above, according to the present invention, the racket is disposed between the string and the frame at the string folding part in the frame of the racket provided with the string, and detects the reaction force of the string due to the impact of a ball or the like and converts it into an electrical signal. Since it is equipped with a piezoelectric element that converts, a counter that counts the electrical signals obtained from this piezoelectric element, and a display element that displays the count value of this counter, the number of strokes for holes etc. during play can be automatically counted at all times. This allows players to accurately grasp the number of at-bats and confirm the optimal amount of exercise and practice according to each player's physical strength and ability, as well as prevent the occurrence of various disorders due to overexertion. Furthermore, it has the effect of being able to estimate the degree of deterioration of the racket.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tennis racket to which the present invention is applied, and FIG. 2 is for explaining the main parts of the racket. 3 is a block diagram of an electronic circuit, FIG. 4 is a perspective view of the grip end, and FIG. 5 is an explanatory diagram of a display board in another embodiment of the present invention. 1... Frame, 1a... Central part, 2... Gut, 3... Shaft, 4... Grip, 4a...
Grip end part, 5...Gut guide, 6...
Piezoelectric element, 7...power supply, 8...filter, 9...
... Amplifier circuit, 10 ... Comparator, 11 ... Counter, 12 ... Driver, 13 ... Display element, 14 ... Reset button, 15 ... Reset circuit, 16 ... Case, R ... Racket.

Claims (1)

[Claims] 1. A piezoelectric element that is disposed between the gut and the frame at the gut folded part in the frame of a racket equipped with a gut, and detects the reaction force of the gut caused by a strike of a ball, etc., and converts it into an electrical signal, and this piezoelectric element A racket stroke counter comprising: a counter for counting electrical signals obtained from the counter; and a display element for displaying the counted value of the counter.