JPH09276462A - Optical fiber screen and batting exercise instrument using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber screen, with which a high-luminance color image can be projected even when it is light around, and to provide a batting exercise instrument using this optical fiber screen. SOLUTION: This instrument is provided with an incident picture part 52 formed by mutually tightly and adjacently bundling respective incident planes 52a of many optical fibers 51a, 51a... so that its planar form can be shaped almost rectangular, and an emitted picture part 53 formed by arranging emission planes 53a of many optical fibers 51a, 51a... at prescribed intervals so that the respective optical fibers 51a can be successively mutually separated gradually from the respective incident planes 52a to the emission planes 53a and its planar form can be shaped almost rectangularly, and the image made incident to the incident picture part 52 is extended and projected on the emitted picture part 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber screen formed by bundling a large number of optical fibers and a batting practice apparatus using the optical fiber screen.

[0002]

2. Description of the Related Art In a conventional batting practice apparatus for a baseball ball or the like, a large number of pitching machines for throwing a baseball ball toward a bat at predetermined time intervals are provided, and each of these many pitching machines is arranged. Batters standing in the front bats practice hitting by hitting back the baseballs thrown by these pitching machines. However, in the actual batting, the batter measures the timing at which the baseball is thrown by looking at the pitching action of the pitcher, and swings (swings) the bat based on this timing, so that the pitching machine does not There was a problem that it was difficult to understand the timing of the launch.

Therefore, a display device using a light emitting diode is arranged in front of the bat, and an image of the pitcher's pitching motion is displayed on the display screen of this display device, and the same timing as the pitcher of this image throws a baseball. Then, a batting practice device has been proposed in which a baseball ball is thrown by a pitching machine from the side of the display screen of the display device. In the batting practice device having the display device for displaying the image of the pitching motion of the pitcher on the display screen, the timing of the pitching machine throwing a baseball is viewed on the display screen as the image of the pitching motion of the pitcher. This makes it possible for the batter to practice batting with the same feeling as an actual batting.

[0004]

Even if the batting practice device having the above-mentioned display device is used, the batting practice device is installed in a bright outdoor place, or at night or indoors. Since it is brightly illuminated so that it is easy to see, in order to display the image of the pitcher's pitching motion on the display screen so that the batter in the bat can clearly see it, the high-brightness display screen against the surrounding brightness. Need to

However, there is a problem that an expensive display device must be used in order to obtain a high-luminance display screen. Further, in order to realistically display the pitching motion of the pitcher on the display screen, the display screen needs to be a color image, but it is difficult to form a color image in a display device using a light emitting diode. Occurs.

Therefore, the present invention has been made in view of the above problems, and provides an optical fiber screen capable of displaying a high-intensity color image even when the surroundings are bright, and a batting practice device using the optical fiber screen. Is to get.

[0007]

In order to solve the above-mentioned problems, the invention described in claim 1 to claim 3 of the present invention is such that the light incident on the incident surface is entirely transmitted through the transparent body at the boundary surface. An optical fiber screen formed by bundling a plurality of optical fibers that propagate while repeating meandering due to reflection and are emitted from an emission surface thereof. In the invention according to claim 1,
An incident screen part formed by bundling the respective incident surfaces of a large number of optical fibers so as to be closely adjacent to each other so that the planar shape thereof becomes a substantially rectangular shape, and from the respective incident surfaces of the large number of optical fibers toward the emission surface As a result, the output surface of each optical fiber is arranged at a predetermined interval so as to be sequentially separated from each other, and the output screen portion is formed so that the planar shape thereof is a substantially rectangular shape. The reason is that the image is enlarged and displayed on the exit screen.

According to a second aspect of the present invention, an aperture plate having a large number of openings formed at predetermined intervals is arranged on the emission surface, and the optical fibers on the emission surface side are inserted into the openings. Then, the emission screen portion is formed. According to a third aspect of the invention, the tip end portion of the emission surface of each of the optical fibers described above is formed into a spherical shape or a flat shape that is larger than the diameter of the opening provided in the aperture plate.

Further, the invention according to claims 4 to 7 of the present invention is a batting practice device comprising a bat and a pitching machine for automatically throwing a baseball toward the bat. In the invention described in Item 4, an optical fiber screen which is disposed on the side of the pitching machine in front of the bat and projects an image of the pitching action of the pitcher, and the optical fiber screen which is disposed behind the optical fiber screen in advance An image display device having an image output device that displays an image of recorded actions on the incident screen portion of the same optical fiber screen, and a pitching machine and an image output device which are arranged behind the bat and output a control signal to the image output device. It is equipped with a control box that controls the operation of the machine and the video output device, and by operating this control box, an image recording the pitching motion of the pitcher is recorded. With Utsushidasu in § driver screen is to have so as to initiate pitching action of the pitching machine in synchronization with the pitching action projected on the optical fiber screen.

According to a fifth aspect of the present invention, the above-mentioned video output device is a video output device for reading out the same video signal of a recording medium recording a pitching motion image of a pitcher as a video signal and outputting the video signal, The video signal recorded on the recording medium is provided with a video projector which reproduces the video signal recorded on the recording medium based on the video signal output from the video output device and focuses it on the incident screen portion of the optical fiber screen. Is reproduced, and the reproduced image is made incident on the incident screen portion of the optical fiber screen, and the image recorded on the recording medium is enlarged and displayed from the emission screen portion.

According to a sixth aspect of the present invention, in the above-described video output device, a film on which a pitching motion image of a pitcher is recorded is arranged on the circumference of the film, and a turntable is rotationally driven by a driving means. The film is provided with a light source for irradiating the film arranged on the circumference of the rotating disk with light, and a condensing means for condensing the light irradiated on the film on the incident screen portion of the optical fiber screen. It is to irradiate and irradiate this radiated light to the incident screen portion of the optical fiber screen so that the image recorded on the film is enlarged and projected from the emission screen portion.

In the invention described in claim 7, the optical fiber screen according to any one of claims 4 to 6 is the optical fiber screen according to any one of claims 1 to 3. Especially.

[0013]

According to the above-mentioned structure, the present invention has the following features.
According to the invention described in (1), the light incident on the incident surface of each optical fiber of the incident screen portion propagates while sequentially separating from each other as it goes from the incident surface to the emission surface, and each emission arranged at a predetermined interval. It will be emitted from the surface. In other words, the individual images emitted from the respective exit surfaces are located separately from the individual images incident on the respective entrance surfaces, so that the entire image emitted from the exit screen of this optical fiber screen is the entrance screen. The image incident on the part becomes an enlarged image. Further, since all the light incident on the incident surface of each optical fiber will be emitted from the emitting surface without optical loss, if a high-intensity color image is incident on the incident surface of each optical fiber. It becomes possible to project a high-intensity color image from the exit screen portion.

According to the second aspect of the present invention, since the emission surface of each optical fiber is inserted into the opening of the aperture plate arranged at the position where the emission screen portion is located, The emitted lights emitted from the emission surface do not interfere with each other, and a clear image can be displayed.

According to the third aspect of the invention, each optical fiber is locked in the opening of the aperture plate by the tip portion formed in a spherical shape or a plane shape larger than the diameter of the aperture arranged in the aperture plate. As a result, the work of bundling the optical fibers and attaching them to the aperture plate becomes easy, and the manufacture of this kind of optical fiber screen becomes simple and easy.

According to the fourth aspect of the present invention, by operating the control box, the pitching motion of the pitcher is displayed on the optical fiber screen arranged on the side of the pitching machine, and is linked to this pitching motion. Then, the pitching machine will start the pitching motion, so that the batter in the bat can take the timing to swing the bat according to the pitching motion of the pitcher projected on the optical fiber screen, You will be able to practice batting with the same feeling.

According to the invention described in claim 5, when the video signal of the recording medium on which the pitching motion image of the pitcher is recorded as a video signal is read by the video output device and is output to the video projector as a video signal, the video projector inputs the video signal. The video signal recorded on the recording medium is reproduced based on the generated video signal, and the reproduced image is condensed on the incident screen portion of the optical fiber screen. Then, the reproduced image focused on the incident screen portion of the optical fiber screen can be enlarged and displayed on the exit screen portion of the optical fiber screen.

Further, according to the invention of claim 6,
When the rotating disk is rotated by irradiating the film on which the image of the pitching motion of the pitcher is recorded with light from the light source, each image recorded on the film is emitted as a moving image. When the moving image is condensed on the incident screen portion of the optical fiber screen by the condensing means, the moving image incident on the incident screen portion is projected in an enlarged manner from the exit screen portion of the optical fiber screen. In this way, each image recorded on the film can be easily displayed as a moving image with a simple structure.

Further, according to the invention described in claim 6,
If the optical fiber screen according to any one of claims 1 to 3 is used, an image of the pitching motion of the pitcher that is incident on the optical fiber screen is emitted without optical loss, so that the bat is batted. The batter in the position can see the pitcher's clear pitching motion image displayed on the optical fiber screen, and the swing timing of the bat can be easily adjusted, and the feeling of hitting can be approximated.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a batting practice device of the present invention will be described below with reference to the drawings. FIG. 1 shows a layout of the batting practice apparatus of the present invention when only one pitching machine and one bat are provided in a batting practice field. Although a plurality of batting practice devices are actually provided in the batting practice field, since each batting practice device has the same configuration, only one batting practice device will be described in the present embodiment. .

In FIG. 1, the batting practice device 10 of the present embodiment is surrounded by a protective net 11. Inside the batting practice device 10, a batting table 20 is provided at the rear position. At a position corresponding to the bat 20 in front of the bat 20, a pitching machine 30 that automatically throws a baseball toward the bat 20, a supply device 40 that supplies a baseball to the pitching machine 30, An image display device 5 for displaying a moving image of a pitching motion from the set position of a pitcher to the pitching of a baseball as shown in 2.
0, and a protective net 12 is provided in front of them so that a baseball ball thrown from the pitching machine 30 passes through a hole (not shown) provided in the protective net 12. .

At the floor 13 in the batting practice device 10, there is a bat 2
An inclination that decreases from 0 toward the front is provided, and a groove (not shown) is provided in the lateral direction at the front end position of the protective net 12. Further, both the floor surface 13 and the groove are provided with an inclination that decreases from the left and right sides toward the center, so that the baseball balls that have fallen on the floor surface 13 in front of the protective net 12 gather at the center of the groove. .

A home base 21 is placed in the bat 20 and a batter box 22 is provided, and a board 23 for receiving a baseball thrown from a pitching machine 30 stands at a rear position of the base 21. I have set up. At the rear position of the board 23, a control box 24 for a batter to operate is provided.

The control box 24 is provided with a pitching control circuit for outputting a control signal to the pitching machine 30, a display control circuit for outputting a control signal to the image display device 50, and an operation panel operated by the batter during use. There is. Here, the pitching control circuit is connected to the pitching machine 30, and the display control circuit is connected to the image display device 50. Further, the operation panel is provided with a coin slot, a prepaid card slot, a start switch, and the like.

Then, the batter who uses the batting practice device 10 inserts a coin into the coin slot or inserts a prepaid card into the prepaid card slot and then presses the start switch on the operation panel to control the pitching. The circuit sends a control signal to the pitching machine 30, and in synchronization with this, the display control circuit sends a control signal to the image display device 50.

The pitching machine 30 is provided with a pair of left and right pitching rollers 31, 32 with their outer peripheral surfaces facing each other. The distance between the outer peripheral surfaces of both pitching rollers 31, 32 is slightly smaller than that of a baseball. It is set. These pitching rollers 31 and 32 are driven to rotate by a roller rotation motor (not shown) via a pulley and a belt. As a result, the left and right pitching rollers 3
In the state in which 1, 32 are rotated, both throwing rollers 31, 3
By supplying the baseball between the two, the pitching machine 30 can throw the baseball forward from the outlet 33.

A baseball is supplied from a supply device 40 through a chute hose 34 between the pitching rollers 31 and 32. The chute hose 34 extends obliquely upward so that a predetermined number of baseballs are always stored in the chute hose 34. Also,
At the tip of the chute hose 34, both throwing rollers 31,
A ball feeder (not shown) for supplying a baseball is arranged between the two. The ball feeder is electrically controlled, and receives a control signal sent from the pitching control circuit of the control box 24 so as to supply a baseball between the pitching rollers 31 and 32. There is.

The supply device 40 is a conveyor for automatically and sequentially carrying upwardly the baseball balls remaining in the groove formed so that the baseball balls that have fallen on the floor surface 13 in front of the protective net 12 gather at the center thereof, The stocker is provided with a stocker for temporarily storing the baseballs carried by the conveyor, and the baseballs in the stocker are sequentially supplied into the shoot hose 34.

FIG. 3 shows an example of the image display device 50. The image display device 50 is provided with an optical fiber screen 51, which will be described later, which is arranged on the side of the outlet 33 of the pitching machine 30, and this optical fiber. The image output device 60 is provided behind the screen 51. The video output device 60 is a recording medium (for example, a video tape, a video disc, or the like) recording a pitching motion image from the set position of the pitcher to the pitching of the baseball.
A video output device (for example, a video tape recorder (V
TR), a video disc player, etc.) 61,
It comprises a video projector 62 which reproduces a video signal recorded on a recording medium based on the video signal output from the video output device 61.

A recording medium such as a video tape or a video disc on which a video signal is recorded is set in the video output device 61 in advance, and the display control circuit of the control box 24 changes the video output device 61 of the video output device 60. When the control signal is sent, the video output device 61 starts reproduction driving. Then, the video output device 61 outputs a video signal corresponding to the video signal recorded on the recording medium. The video signal output from the video output device 61 is input to the video projector 62, and the projection lens 63 provided on the front surface of the video projector 62 is condensed and projected toward the incident screen portion of the optical fiber screen 51. As a result, an image of the pitching motion from the pitcher's set position to the pitching of the baseball is projected from the exit screen portion of the optical fiber screen 51, and in conjunction with this, the pitching machine 30 pitches the baseball. It will be.

Therefore, the batter using this batting practice device can measure the timing of swinging the bat in accordance with the pitching motion of the pitcher projected on the exit screen of the optical fiber screen 51. You will be able to practice batting with a feeling similar to baseball batting practice.

It should be noted that pitching motion images from the set positions of a plurality of pitchers to the pitching of a baseball are input to a recording medium such as a video tape or a video disk, and an image selection switch is provided in the control box 24. If the image selection signal is transmitted from the display control circuit based on the selection of the selection switch, the batter using this batting practice device can select an image of a pitcher of his or her preference to perform batting practice. You will be able to practice a variety of batting practice.

FIG. 4 shows another example of the image display device 50. The image display device 50 comprises an optical fiber screen 51 and a video output device 70 arranged behind the optical fiber screen 51. ing. This video output device 70 receives a light source 71 such as a halogen lamp that emits light toward the optical fiber screen 51, receives light emitted from the light source 71, and collects the light on an incident screen portion of the optical fiber screen 51. And a storage medium including a film 73 on which an image is printed (stored) between the light source 71 and the condenser lens 72.

This film 73 is a film made of a transparent material which is set up on a turntable 74 by dividing a film obtained by shooting the pitching motion from the set position of the pitcher until the baseball is thrown into each frame. Each frame is attached to the plate by adhesion or the like. A rotary shaft 76 pivotally supported by a bearing 75 is provided at the center of the rotary plate 74, and the rotary shaft 76 rotates when the motor 77 starts rotating.
It is configured to be rotationally driven via a rotation transmission mechanism 78 connected to the rotary shaft of No. 7. The motor 77 is connected to the controller 79, and the rotation speed of the motor 76 is controlled based on the control signal from the controller 79.
The rotation speed of the turntable 74 is also controlled.

When the control signal sent from the display control circuit of the control box 24 is input to the controller 79, the image display device 70 emits light from the light source 71 and rotates the turntable 74. As a result, the turntable 7
The film 73 arranged on the circumference of 4 is irradiated with light, and an image of the pitching motion recorded from the set position until the pitcher throws a baseball is emitted as a moving image. It When this moving image is focused on the incident screen portion of the optical fiber screen 51 by the lens 72,
The moving image incident on the incident screen portion is enlarged and displayed on the emission screen portion of the optical fiber screen 51. In this way, each image recorded on the film can be easily displayed as a moving image with a simple structure.

FIG. 5 is a schematic view showing a main part of the above-mentioned optical fiber screen 51, FIG. 5 (a) is a schematic perspective view showing a main part of the optical fiber screen 51, and FIG.
Is a plan view showing the entrance screen section, and FIG. 5C is a plan view showing the exit screen section. 6 is a view showing a state in which the present optical fiber screen 51 is placed on a support base, and FIG. 6 (a) is a front view.
(B) is a side view.

5 and 6, the optical fiber screen 51 of the present invention comprises a large number of optical fibers 51a and 51a.
.. are bundled together, and each optical fiber 51a
Is composed of a core that constitutes the central portion of the core and a clad that covers the outer periphery of the core, and has a diameter of about 1 to 3 mm. Here, as the material of the core, a highly transparent material having a predetermined refractive index, for example, methacrylic resin (for example, polymethylmethacrylate) is adopted so as to guide light inside. The material of the clad is a material having a refractive index smaller than that of the material of the core so that the light incident on the core is totally reflected at the interface between the core and the clad and not transmitted to the outside of the core. For example, a fluororesin is adopted.

The shape of the tip of each optical fiber 51a on the side of the emission surface 53a is as shown in FIG. 7 (a), a flat plate portion 53a _{1 obtained by} crushing the tip into a flat plate shape, or FIG. 7 (b). As shown, a spherical portion 53a ₂ having a spherical tip is provided. An aperture plate 54 provided with apertures 55, 55, ... Having a size approximately the same as the diameter of the optical fiber 51a is arranged on the exit surface 53a side of each optical fiber 51a at intervals of several millimeters to several millimeters. .. are inserted into the openings 55, 55, ... From the entrance surface 52a side of the optical fibers 51a, 51a ,. There is. FIG. 7 (c) shows an optical fiber 5 having a flat plate portion 53a ₁ formed by crushing the distal end portion into a flat plate shape.
The side view at the time of attaching to the aperture plate 54 using 1a is shown.

Each optical fiber 51a, 51a, ...
.. from the incident surface 52a side of the openings 55, 5 of the opening plate 54
After inserting the optical fibers 51a, 51a, ... into the optical fibers 5, ..., The optical fibers 51a, 51a ,. An incident screen portion having a substantially rectangular planar shape so that the side portions of the respective optical fibers 51a are tightly adjacent to each other by bundling them so that their sides are located in the central portion of the aperture plate 54, and the side portions thereof are closely adjacent to each other. 53 is formed.

Here, the opening plate 54 is made of a metal plate or a synthetic resin plate whose surface or the whole is made black, and a large number of openings 55 are provided in this plate. As the aperture plate 54, specifically, for example, a plate having a width of 90 cm and a height of 180 cm is prepared, and an odd number of 82 stages in which 111 apertures are provided at a pitch of 8 mm and a pitch of 8 mm. 81 even-numbered stages with 110 apertures are provided, and the diameter of the apertures is 1.
A size of 2 mm and a total of 18012 openings is used, so that a life-size image can be displayed. A support column 5 in which the opening plate 54 is placed on a support base 56 and the support base 56 and the opening plate 55 are provided at appropriate places.
6, the optical fiber screen 51 fixed by the column 56
Is formed.

As described above, the light incident on the incident surface 52a of each optical fiber 51a of the incident screen portion 52 propagates while being separated from each other as it goes from the incident surface 52a to the emitting surface 53a, and is arranged at a predetermined interval. Each exit surface 53
It will be emitted from a. That is, the individual images emitted from the respective emission surfaces 53a are located separately from the individual images incident on the respective incident surfaces 52a, and as a result, the entire image emitted from the emission screen portion 53 of the optical fiber screen 51. The image is an enlarged image of the image incident on the incident screen unit 52. In addition, the incident surface 52 of each optical fiber 51a
Since all of the light that has entered the a is emitted from the emission surface 53a without any light loss, such an optical fiber screen 51 can display a high-intensity color image.

Further, an aperture plate 54 having a large number of apertures 55 formed at predetermined intervals is arranged at the place where the above-mentioned emission screen portion 53 is located, and each optical fiber 51a is placed in the aperture 55 of the aperture plate 54. Since the light emitting surface 53a is inserted, the light emitted from the light emitting surface 53a of each optical fiber 51a does not interfere with each other, and a clear image can be displayed. Further, the openings 5 arranged in the opening plate 54.
Plane 53a ₁ or spherical 53a ₂ larger than the diameter of 5
Since the optical fiber 51a can be locked in the opening 55 of the opening plate 54 by the tip portion formed on the optical fiber 51a, it is easy to bundle the optical fibers 51a and attach them to the opening plate 54. The manufacture of the screen 51 is simple and easy.

The operation of the batting practice device 10 of the present embodiment configured as described above will be described by taking the case of using the image display device 50 having the video output device 60 of FIG. 3 as an example. First, a pitcher who uses the batting practice device 10 inserts a coin into the coin slot or inserts a prepaid card into the prepaid card slot, and then presses a start switch on the operation panel. The control signal is sent to the machine 30, and in synchronization with this, the display control circuit sends the control signal to the video output device 61 of the video output device 60.

When the control signal from the display control circuit is input to the video output device 61, the video output device 61 records the video signal of the video tape or the video disk set in the video output device 61. The reproduction operation of the video signal of the medium is started. Then, a video signal is output from the video output device 61 to the video projector 62, and the pitching operation from the set position of the pitcher to the pitching of the baseball is performed from the exit screen portion of the optical fiber screen 51 provided on the front surface of the video projector 62. The image will be enlarged and displayed.

On the other hand, when the control signal from the pitching control circuit is input to the pitching machine 30, the ball feeder arranged at the tip of the chute hose 34 of the pitching machine 30 is stored in the chute hose 34. Rolling ball 3 with only one baseball in rotation
Supply between 1 and 32. When the baseball is supplied between the pitching rollers 31 and 32, the baseball is thrown from the pitching machine 30.

In the present embodiment configured as described above, the pitching machine 30 starts the pitching operation by operating the start switch of the control box 24, and is arranged in front of the pitching machine 30. A baseball ball is thrown from the pitching machine 30 in synchronization with the pitching action of the pitcher projected on the optical fiber screen 51. Therefore, the batter in the grasshopper box 22 of the bat 20 can take the timing of swinging the bat in accordance with the pitching motion of the pitcher projected on the optical fiber screen 51, which is the same as the actual baseball batting practice. You will be able to practice batting practice with a sense.

In the above embodiment, a video tape, a video disc or the like is used as a recording medium, and a video tape recorder (VTR) is used as a video output device.
Although an example using a video disc player or the like has been described, it is obvious that a CDROM, a hard disk or the like may be used as the recording medium and a computer may be used as the video output device.

In the above embodiment, an example in which only the pitching motion image of the pitcher is projected on the optical fiber screen of the present invention has been described, but the optical fiber screen of the present invention has been previously filed by the applicant. Wishhei 7-1478
When used in the baseball game device proposed in No. 88, it is possible to project the pitching motion image of the pitcher on the optical fiber screen together with the image of the score boat. By doing so, it becomes possible to more realistically enjoy the baseball game.

In the above embodiment, an example of using a batting practice device in a batting practice field for baseball has been described, but the batting practice device of the present invention is also used as a batting practice device for golf, tennis and the like. be able to. In the case of golf, it becomes possible to record an image of a golf swing of an individual golfer at a golf school or the like and immediately display the recorded image in a large size, so that the golf school can be efficiently advanced. Also,
In the case of tennis, an image of a shot of a tennis player may be recorded in advance, and the tennis ball may be launched from the tennis practice device by matching these images.

[Brief description of drawings]

FIG. 1 is a view showing a batting practice device using an optical fiber screen of the present invention.

FIG. 2 is a diagram showing an example of an image displayed on the optical fiber screen of FIG.

FIG. 3 is a diagram showing an example of the image display device of FIG.

FIG. 4 is a diagram showing another example of the image display device of FIG.

5 is a diagram showing a main part of the optical fiber screen of FIG.

FIG. 6 is a view showing a main part of the optical fiber screen of FIG. 1 similarly to FIG.

7 is a diagram showing a part of the optical fiber screen of FIG.

[Explanation of symbols]

10 ... batting practice device, 11 ... protective net, 12 ... protective net, 13 ... floor surface, 20 ... bat, 21 ... home base,
22 ... Grasshopper box, 23 ... Board, 24 ... Control box, 30 ... Pitching machine, 31, 32 ... Pitching roller, 33 ... Ball throwing port, 34 ... Shoot hose, 4
0 ... Supply device, 50 ... Image display device, 51 ... Optical fiber screen, 51a ... Optical fiber, 52a ... Optical fiber entrance surface, 52 ... Incident screen portion, 53a ... Optical fiber exit surface, 53 ... Exit screen portion, 54 ... Aperture plate, 55 ... Aperture,
60, 70 ... Video output device

Claims (7)

[Claims] 1. An optical fiber formed by bundling a large number of optical fibers which are incident on an incident surface and propagate through a transparent body while repeating meandering due to total reflection at a boundary surface and emitted from the emission surface. A screen, an incident screen portion formed by bundling the respective incident surfaces of the plurality of optical fibers so as to be closely adjacent to each other and having a planar shape of a substantially rectangular shape, and each of the plurality of optical fibers. And an emission screen portion formed such that the emission surfaces of the respective optical fibers are arranged at predetermined intervals so as to be sequentially separated from each other from the incident surface toward the emission surface, and the planar shape thereof is formed into a substantially rectangular shape. An optical fiber screen, wherein an image incident on the incident screen portion is enlarged and displayed on the emission screen portion. 2. An opening plate having a large number of openings formed at predetermined intervals is disposed at a position where the emission screen section is located, and the optical fibers on the emission surface side are inserted into the openings. The optical fiber screen according to claim 1, wherein an emission screen portion is formed. 3. The optical fiber screen according to claim 1, wherein the tip of the emission surface of each of the optical fibers is formed in a spherical shape or a flat shape larger than the diameter of the opening. 4. A batting practice device comprising a bat and a pitching machine for automatically throwing a baseball toward the bat, the pitcher being provided on the side of the pitching machine in front of the bat. An optical fiber screen for displaying an image of the pitching movement of the optical fiber screen, and an image output device arranged behind the optical fiber screen for displaying an image in which the pitching movement of the pitcher is recorded in advance on an incident screen portion of the optical fiber screen. An image display device; and a control box that is disposed behind the at-bat and outputs a control signal to the pitching machine and the video output device to control the operation of the pitching machine and the video output device. By operating the box, an image recording the pitching movement of the pitcher is displayed on the optical fiber screen, and A batting practice device using an optical fiber screen, characterized in that the pitching motion of the pitching machine is started in synchronization with the pitching motion displayed on the fiber screen. 5. The video output device, which outputs a video signal by reading the video signal of a recording medium on which a pitching motion image of a pitcher is recorded as a video signal, and a video output from the video output device. A video projector for reproducing the video signal recorded on the recording medium based on the signal and condensing it on the incident screen portion of the optical fiber screen, and reproducing the video signal recorded on the recording medium for reproduction. The optical fiber screen according to claim 4, wherein the image is made incident on an incident screen portion of the optical fiber screen, and the image recorded on the recording medium is enlarged and projected from the emission screen portion. The batting practice device used. 6. The video output device includes a film on which a pitching motion image of a pitcher is recorded, arranged on the circumference of the film, and a rotary disk which is rotationally driven by a driving means, and a film arranged on the circumference of the rotary disk. The film is provided with a light source that irradiates the film with light, and a condensing unit that condenses the light with which the film is irradiated onto the incident screen portion of the optical fiber screen. The optical fiber screen according to claim 4, wherein light is made incident on an incident screen portion of the optical fiber screen so that an image recorded on the film is enlarged and projected from the emission screen portion. Batting practice device. 7. The optical fiber screen according to claim 4, wherein the optical fiber screen uses the optical fiber screen according to any one of claims 1 to 3. A batting practice device that uses a screen.