JPH06274624A - Method and apparatus for detection of change in motion of projected body - Google Patents

Abstract

PURPOSE: To detect a turning degree and speed change of a thrown baseball by detecting a moment position of the thrown ball as two-dimensional coordinate through each sense means. CONSTITUTION: Many sense means 101 to 115 are arranged between a movement start point P and a movement end point C and, for example, detect position change of a thrown baseball in a two-dimensional coordinate form as a projection band. A computer 12 also synchronizes two-dimensional coordinate value which outputs from the sense means 101 to 115 with an internal clock, inputs it and calculates the baseball speed by using a previously established distance between the sense means 101 to 115 and the two-dimensional coordinate value to input. Thereby, a turning degree and speed change of the baseball can be detected, and specially, to what extent the baseball changes in front of a batter can be measured in detail by closely setting up optical grid structures which are detection means 101 to 115 around a home plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projecting body (in-air moving body).
The present invention relates to a method and apparatus for detecting a change in movement, and more particularly to a method and apparatus for detecting the speed and path of a baseball.

[0002]

2. Description of the Related Art Pitchers, which occupy an important position in a baseball game, carry out various trainings to improve the quality and speed of a baseball. However, the speed of the thrown ball is conventionally measured only at a specific position using a speed gun, and the measurement of the head of the ball and the degree of bending to the left and right is the position where the human eye or the position where the ball stops at the end. Depended on. Therefore, there is a problem that the degree of bending and the change in speed of the ball thrown between the pitcher and the home base cannot be accurately detected.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to detect the instantaneous position of a thrown baseball ball by using a large number of sensing means provided in a plane orthogonal to a straight line connecting a pitcher seat and a catcher seat, for example. It is an object of the present invention to provide a movement change detecting method for a baseball ball, which can detect the bending degree and the speed change of the thrown ball by detecting each sensing means as two-dimensional coordinates.

Another object of the present invention is to provide a movement change detecting device for a baseball ball which can detect the degree of bending and the change in speed of the thrown ball.

[0005]

The above objects of the present invention are as follows.
In the method of detecting the movement change of a projectile, a virtual straight line connecting a first position and a second position where the projectile is expected to pass is divided into predetermined intervals, and a virtual straight line is formed at each of the plurality of divided points. Setting a two-dimensional coordinate system in a plane orthogonal to the step; calculating a section interval value between a plurality of division points; and in each of the plurality of two-dimensional coordinate systems, a projection object passing through the coordinate system. And a two-dimensional coordinate value corresponding to the position; a step of detecting a movement change amount of the projectile using the interval value and the two-dimensional coordinate value; .

Another object of the present invention is a device for detecting movement change of a projectile, wherein a plurality of sensing means are provided between a first position and a second position where the projectile is expected to pass. Each of the installation positions is provided with a large number of light emitters and light receivers which are located in a plane orthogonal to a virtual straight line connecting the first position and the second position and are arranged to face each other. A plurality of sensing means for sensing two-dimensional coordinate values; a control means for storing distance data between division points and for calculating the amount of movement change of the projection body by inputting the two-dimensional coordinate values from the sensing means; This is achieved by a motion change detecting device for a projectile including a unit for outputting the calculated motion change amount in a predetermined form; and a command input unit for controlling the operation of the control unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a movement change detecting device for a baseball ball according to a preferred embodiment of the present invention.

As shown in FIG. 1, in the detection apparatus of the present invention, a large number of sensing means 101 to 115 are arranged on a virtual straight line L connecting the pitcher seat P and the catcher seat C. These sensing means 101 to 115 detect the passing position of the thrown ball by a two-dimensional coordinate value that crosses the line. The two-dimensional coordinate values detected by the sensing means 101 to 115 are input to the control means 12. The control means 12 calculates the position change and the speed change of the baseball from the two-dimensional coordinate values and stores them. The control means 12 will be described in more detail with reference to FIG. Further, the detection device of the present invention includes a keyboard 14 for controlling the function of the control means 12, a monitor 16 for displaying data, and a printer 18 for printing data. Not only that, it is preferable to further include the status display board 20 that allows data to be visually recognized from a long distance.

The sensing means 101-115 detect the position of the thrown baseball at every desired distance interval and control means 1
2 has the form of an optical grating structure transmitting. Then, the respective optical lattice structures are configured such that the arrangement interval between them can be arbitrarily changed according to the needs of the user.

FIG. 2 is a conceptual diagram of each of the sensing means 101-115. Each of the sensing means 101 to 115 is preferably an optical lattice structure having a height adjusting function and having a size of about 3 m × 3 m. Among the four sides of this lattice structure, for example, 50 light emitters 51 are arranged at 6 cm intervals on the upper side and the right side, and 50 light receivers 52 are arranged on the lower side and the left side at 6 cm intervals. Each light emitter 51 is composed of, for example, a photodiode that emits infrared rays, and each light receiver 5
Reference numeral 2 is composed of a light receiving element that receives infrared rays emitted from the light emitters 51 facing each other. In this embodiment, a diode that emits infrared rays is used as the light emitter, but any form of signal generator capable of detecting the position of an object passing through the lattice structure can be used in the present invention.

The value of 6 cm as the installation interval between the light emitter 51 and the light receiver 52 is set in two orthogonal directions of the upper side and the right side when the baseball ball passes through the optical lattice structure regardless of the passing position. Light from at least one of the arranged light emitters 51 is blocked by the baseball, and as a result, light is not incident on the corresponding light receiver 52. Therefore, this interval is
It changes depending on the size of the ball (projector) to be measured. The optical lattice spacing schematically shown in FIG. 2 is wider than the actual lattice spacing.

In addition, each of the sensing means 101 to 115 protects the light emitter 51 and the light receiver 52 from an external impact,
It comprises a protective band (not shown) surrounding the light emitter and the light receiver attached to itself.

FIG. 3 is a detailed view of the control means 12 of the apparatus shown in FIG. 1, which includes a central processing unit 30, a ROM 34 holding a program for calculating the speed of a baseball,
RAM 36, a communication porter 38 for information communication with an external device (not shown), and the above-mentioned sensing means 101-11.
5, a drive unit 40 for driving a group of light emitters 51, a signal exchange unit 42 connected to the light receiver 52 for detecting and outputting a no-signal state of the light receiver for each lattice structure, and a drive unit 40,
An input / output interface 32 is provided between the signal conversion unit 42 and the central processing unit 30. The driving unit 40 and the signal converting unit 42 preferably have a capacity capable of supporting 128 optical grating structures. The apparatus of FIG. 3 includes a hard disk (not shown) that stores the data calculated by the central processing unit 30.

If the user inputs a command for operating the apparatus of FIG. 2 together with the distance information between the lattice structures through the keyboard 14 with the heights of the respective optical lattice structures being adjusted to the same, the center is displayed. The processing unit 30 reads a program for calculating the speed of the baseball from the ROM 34, and the distance between the lattice structures input by the user is input to initialize the above program. Then, the central processing unit 30 outputs a drive control signal to the drive unit 40 and the signal conversion unit 42 through the input / output interface 32. Drive unit 4
0 is the sensing means 101-115 according to the input drive control signal.
Each of the light emitters 51 is operated to generate and output infrared rays from each light emitter 51. The infrared light emitted from the light emitter 51 enters the light receiver 52 corresponding to each light emitter.

When the pitcher throws a baseball from the pitcher seat P toward the catcher seat with the device of FIG. 3 initialized, the baseball ball passes through the optical lattice structure of the sensing means 101 to 115. At that time, the light from at least one light emitter 51 in the two light emitters 51 in the two orthogonal directions is blocked by the baseball. That is,
At least one of the light receivers 52 in the two orthogonal directions does not receive light. This signalless position is
The position where the baseball has passed, and the sensing means 101 to 101
The two-dimensional coordinates are detected in each of the fifteen.
The non-signal position detected by the pair of light receivers 52 in the two orthogonal directions indicates the status indicator 20 and the signal converter 4.
2 is output.

The status indicator 20 compares the input no-signal position information with a preset strike area to determine whether it is a strike or a ball, and at the same time determines the position of a ball coming into the strike area. And the status indicator 2
0 indicates the determined position of the ball through a lamp or the like. The signal converter 42 converts the input no-signal position information into digital data synchronized with the clock of the control means 12 and outputs it to the input / output interface 32. That is, in the signal conversion unit 42, all the sensing means 101 to 115 are the light receivers 5.
The non-signal position detected through 2 is converted into digital data synchronized with the basic clock of the system and output to the input / output interface 32. The data output from the signal conversion unit 42 is input to the central processing unit 30, and the two-dimensional coordinate value of the baseball passing through each optical lattice structure is calculated. Then, the central processing unit 30 calculates the speed of the baseball ball passing between the adjacent lattice structures by using the time difference in which the data is input and the input (stored) distance between the lattice structures. Therefore, the velocity of the thrown baseball is calculated by the two-dimensional coordinate value of the baseball passing through each optical lattice structure and the speed of the baseball passing between adjacent lattice structures.

The central processing unit 30 stores the velocity of the thrown baseball ball obtained as a vector value in the RAM 36 in a unit velocity unit calculated for each adjacent sensing means. Since the distance between the sensing means can be adjusted arbitrarily, if the optical lattice structure serving as the sensing means is finely installed around the home plate, it is possible to precisely measure the degree to which the baseball changes before the batter. The section speed of the baseball ball stored in the RAM 36 is calculated by the average speed by the user's key input for calculating the average speed. The section speed, the average speed, etc. of the baseball are calculated by the central processing unit 30 as required by the user, and displayed on the monitor 16 or output through the printer 18. The trajectory of the baseball is also graphic-processed according to the user's request and is output through the monitor 16 and the printer 18. The central processing unit 30 stores the section speed of the baseball ball accumulated every time the number of pitches increases in the hard disk. Therefore, the ball quality and speed for a specific pitcher can be reconstructed into statistical data. The computer-generated data relating to the movement change of the baseball is transmitted to another system through the communication porter 38 according to the user's need.

In the above-described embodiment, the height of the grating structure is measured by operating the optical grating structures which are the sensing means, but after measuring the height of the grating structure using the height sensing sensor. It is also possible within the scope of the present invention to reset the reference height of the lattice structure in the computer.

[0019]

As described above, the method and apparatus for detecting the movement change of the projectile according to the present invention have a structure in which a large number of them are arranged between the movement start point and the movement end point. A sensing means for detecting a position change of the thrown baseball in a two-dimensional coordinate form, and a two-dimensional coordinate value output from the sensing means is inputted in synchronization with an internal clock and inputted as a preset distance between the sensing means. By providing a computer that calculates the speed of a baseball using two-dimensional coordinate values, the degree of bending and the speed change of the baseball can be detected.
In particular, an optical lattice structure, which is a sensing means, is finely installed near the home plate, and it is possible to precisely measure the degree to which the baseball ball changes in front of the batter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a motion change detecting device for a baseball according to a preferred embodiment of the present invention.

FIG. 2 is a conceptual diagram of an optical grating structure.

FIG. 3 is a detailed view of the control means of FIG.

[Explanation of symbols]

 12 Control means 20 Situation indicator 101-115 Sensing means (two-dimensional coordinate system) P Pitcher seat (1st position) C Catcher seat (2nd position) L Virtual straight line

Claims (8)

[Claims] 1. A method for detecting a movement change of a projectile, wherein a virtual straight line connecting a first position and a second position where the projector is expected to pass is divided into predetermined intervals, and the plurality of divided points are divided. In each of the steps, a two-dimensional coordinate system is set in a plane orthogonal to the virtual straight line; a step interval value between the plurality of division points is calculated; A projecting object including: a step of outputting a two-dimensional coordinate value corresponding to a position of the projecting object passing through the coordinate system; and a step of detecting a motion change amount of the projecting object by using the interval value and the two-dimensional coordinate value. Method for detecting movement changes in humans. 2. The method according to claim 1, wherein the movement change amount of the projection body is a trajectory of the projection body. 3. The method according to claim 1, wherein the motion change amount of the projectile is the speed of the projectile. 4. An apparatus for detecting a movement change of a projectile, wherein a plurality of sensing means installation positions are provided between a first position and a second position where the projection object is expected to pass; and these sensing means. A point at which the projecting body has passed, which is provided with a large number of light emitters and light receivers that are located in a plane orthogonal to a virtual line connecting the first position and the second position in the installation position and are arranged to face each other. A plurality of sensing means for sensing the two-dimensional coordinate values of the above; and a control means for storing the distance data between the division points and for receiving the two-dimensional coordinate values from the sensing means to calculate the amount of change in the motion of the projectile; Means for outputting the amount of movement change calculated from the control means in a predetermined form;
Command input means for controlling the operation of the control means;
A motion change detection device for a projectile including a. 5. The movement change detection device for a projection object according to claim 4, wherein the control means includes a signal conversion unit that converts the two-dimensional coordinate value into data synchronized with a reference clock. 6. The projecting object according to claim 4, further comprising a status display plate for inputting a two-dimensional coordinate value from a sensing unit located closest to the second position and displaying the position of the projecting object. Movement change detection device. 7. The movement change detecting device for a projection object according to claim 4, wherein the display means displays the trajectory of the projection object on a graph screen. 8. The method according to claim 1, wherein the projectile is a baseball, and the first position and the second position respectively detect a change in motion of the projector that hits a pitcher seat and a catcher seat, respectively. apparatus.