JP2725124B2 - Ball game ball position determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a sensor in various ball games without using uncertainty to judge the whereabouts of the ball (for example, the position of the ball falling on the line during a tennis game). The present invention relates to a ball game ball position determination device capable of performing accurate position determination.

[0002]

2. Description of the Related Art Conventionally, in a ball game such as tennis or volleyball, ball judgment (in or out) at the line is performed by the main referee, assistant referee, line referee, etc. It is difficult to always make accurate judgments, and sometimes a competitor may not be satisfied with a misjudgment, which has led to various angers and changes in the game flow. In order to solve such problems, a pressure sensor (pressure-sensitive sensor) is laid around the line or on the entire surface of the court, and the position of the ball is determined by sensing the pressure generated when the ball comes into contact with the ball. (Japanese Utility Model No. 57-2078, Japanese Utility Model Application 59)
No. 137,769 and Japanese Utility Model Laid-Open No. 62-82071) have been devised.

[0003]

However, the conventional position judging device senses pressure by an object touching near the line or on the entire surface of the court, and also detects an object other than the ball. Although it has the function of selecting only the ball by storing it, it is very likely that a pattern similar to the contact of the racket etc. will occur due to the rotation or speed of the ball, and it is very likely that it will malfunction, such as tennis As described above, it is difficult to use a pressure-sensitive sensor in a game in which an object other than a ball moves around on a court, and is not suitable for practical use.

The present invention has been made in view of the above points, and in various ball games such as tennis, by accurately determining the whereabouts of a ball such as a drop position of the ball, the player can always play or play in the best condition. It is an object of the present invention to provide a ball game ball position judging device that enables practice.

[0005]

In order to achieve the above object, a ball game ball position judging device according to the present invention is capable of detecting a magnetic change.
An electric circuit that converts the magnetic
Tape or sheet-shaped magnetic sensor
Laying near each line or on the required area surface
A magnetic force for causing the magnetic change is provided .

[0006]

[Action] or more as position determination device of the ball game ball of the present invention, tennis, volleyball, in the ball games such as baseball, ball
Skill balls are laid near the line of the ball stadium or on the required area
On a tape-shaped or sheet-shaped magnetic sensor
If it falls, it will be magnetized by the magnetic force of the ball
The magnetic sensor detects this change in electrical
Signal to detect the magnetic change position
The position of the drop is immediately known,
No need to check the
Can be determined immediately and uses a pressure-sensitive sensor
Unlike in the case where the ball game is a ball game in which another object (e.g., a ball player, a racket, a club, or the like) may come into contact with the ball game surface in the same manner as the ball, the other object may be erroneously determined to be a ball. There is no malfunction, and accurate in / out judgment can always be made.

[0007]

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

FIG. 1 shows an embodiment of the present invention and is a plan view of a tennis court, FIG. 2 is a partially cutaway side view showing a tennis ball, FIG. 3 is a partial cross-sectional view showing a magnetic sensor,
FIG. 4 is a side view showing an optical sensor unit for detecting the passage of a ball on a net.

In the drawings, reference numeral 1 denotes a magnetic sensor, which detects a magnetic body 2 attached to a tennis ball 4 and detects a drop position (contact position) of the tennis ball 4, such as an omni coat or a rubber court. The tennis ball 4 is laid at an appropriate position below the court surface portion 3, and a magnetic change generated when the tennis ball 4 contacts the court surface is converted into an electric signal by an element such as an electric resistance element or a hall element to contact the court surface portion 3. Has an electric circuit for detecting

The magnetic sensor 1 is formed in an elongated tape shape along the respective lines of the coat, the base line A1, the double side line A2, the single side line A3, the service line A4, and the center line A5. Only the ball determination may be performed, or a sheet-like sensor formed so as to determine the ball position on the entire surface of the court may be laid. In this case, each zone Z divided by each line and the net A6
1, Z2, Z3, Z4, Z5 and the out zone Z6 are appropriately determined. However, it is necessary to provide a circuit that can change the criterion of each zone at any time. For example, at the time of service, only the zone Z1 or the zone Z2 is a safe zone, but when the serve is turned on and the game is continued, the zones Z1, Z2, Z3 are immediately set as the safe zones. (Zones Z1, Z2, Z3, Z for doubles
4. Z5 is the safe zone. )

Reference numeral 2 denotes a magnetic material, and a skin 4 of the tennis ball 4
a coating containing a magnetic substance is applied between the inner skin 4a and the inner core 4b.
Is applied to the inner surface of the inner core 4b even if it has magnetism.
You may. In place of the magnetic ball determination, a configuration in which a special metal is attached to the tennis ball 4 and a sensor for detecting the metal is laid on the court surface to determine the position of the ball is sufficiently possible.

Although not illustrated in the present embodiment, safe or out is determined based on an output signal from a sensor of a ball contacting portion in the same manner as in an existing ball determination device (safe or out of each zone as described above). Display means (a lamp, a buzzer, a synthetic human voice, etc.) for informing the ball player and other persons of the determination). Further, automatic control, internal storage, etc. are performed in conjunction with the computer. If this is done, automatic judgment that eliminates the need for referees is also possible, but at this time it is necessary to detect the ball passing over the net (for example, when the opponent returns the ball hit by a volley directly Even though the ball was returned to the safe zone of the opponent's court again and play continued, the ball touched his court twice consecutively with the magnetic sensor alone. , The player loses in the middle of the play and an operation error occurs.), FIGS. 1 and 4
As shown in the figure, the magnetic sensor 1 is also provided on the net A6, and the columns 5 are provided on both ends of the net A6, and the columns 5 are provided with the light emitting portions 6 and the optical sensors 7 to take measures to detect the passage of the ball. Shall be.

[0013]

As described above, according to the present invention, the drop position of a ball in ball games such as tennis, volleyball, and baseball can be accurately determined. In the case of tennis, objects other than the ball can be detected. It is a device that eliminates malfunctions by using a sensor as a detection object as a ball without using a pressure sensor, and it can be said that it is a device very suitable for practical use, a great effect for ball players and stakeholders Is played.

[Brief description of the drawings]

FIG. 1 is a plan view of a tennis court according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a tennis ball.

FIG. 3 is a partial cross-sectional view showing a magnetic sensor.

FIG. 4 is a side view showing an optical sensor unit that detects the passage of a ball on a net.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic sensor 2 Magnetic body 3 Court surface part 4 Tennis ball 5 Prop 6 Light emitting part 7 Optical sensor

Claims (3)

(57) [Claims] 1. A method for converting a magnetic change into an electric signal, comprising the steps of:
Tape with an electrical circuit to detect
Use a sheet-shaped magnetic sensor near each line
Laying on the surface of the area, causing the ball change the magnetic change
Position determination of ball game ball characterized by having magnetic force
Setting device. 2. The surface or inner surface of a ball or ball of a ball game ball
Apply magnetic paint to the surface of the ball
Mix magnetic particles in the adhesive that bonds the skin and inner core.
2. The position determination of a ball game ball according to claim 1,
apparatus. 3. The tennis ball according to claim 1, wherein
The area around the tennis court line or the area
, And the same magnetic sensor is also installed on the tennis net,
Each magnetic sensor causes a magnetic change in the tennis ball.
Magnetic poles, and each of the columns standing on both ends of the net
A light emitting unit and optical sensor for sensing the passage of a ball above the net
A tennis ball drop position on the court surface.
Judgment of contact of tennis ball with net and crossing of net
A ball game characterized by taking measures that can be performed at any time
Ball position determination device.