JPH04114671A - Device for detecting vertical motional change in head - Google Patents

Abstract

PURPOSE:To inform a player of the vertical movement of his head with a simple construction without interfering with his swing by providing a detecting device consisting of a pressure detecting means for detecting a difference between air pressure in first and second chambers and an informing means for informing the condition of vertical motional change in his head on the basis of a detecting signal of the pressure detecting means. CONSTITUTION:A means for detecting the vertical motional change in the head is provided with a first chamber 310 having the inner air pressure instantly responding to the variation of the atmospheric pressure accompanying a change in the altitude, a second chamber communicating to the atmosphere in the altitude position in a time lag, a pressure detecting means 9 for detecting differences between internal air pressure in first, third, tenth chambers and second, fourth, eleventh chambers in an altitude position and an informing means 10 for informing the condition of vertical motional change in the head on the basis of the detecting signal of the pressure detecting means. Also, the pressure receiving surface of a condenser microphone as the pressure detecting means 9 for example is preferably earthed in such a point that acceleration between air flow accompanying acceleration in the first chamber and air flow accompanying acceleration in the second chamber becomes zero. Thus, the acceleration component is offset by air shift generated in the first and second chambers when a housing is shifted so that only the speed of change in actually desired air pressure can be detected to obtain the higher accuracy result.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a detection device that detects the vertical movement of a player's head when swinging a golf club, baseball bat, tennis or badminton racket, etc. In particular, based on the principle of a lift meter that uses a microphone as a low pressure sensor,
The present invention relates to a head vertical movement change detecting device that easily informs with sound, vibration, etc. when a player's head is slightly raised or lowered.

[Conventional techniques and their problems] Conventionally, in order to improve in the above ball sports, it is necessary to swing a club, bat, racket, etc. with the correct form, and for this purpose, daily practice of swinging is important. . However, if you just practice swing aimlessly, you won't get the benefit of practicing; it is important to practice swing repeatedly with the correct form.

Correct form here means not taking your eyes off the ball, and keeping the distance between your eyes and the ball constant during the swing, that is, not heading up or down.

However, in general, with amateur airplayers, when swinging, the head inevitably moves up and down, causing the eyes to sway, which causes the player to momentarily lose sight of the ball and hit it, causing the club or bat to miss the sweet spot and hit the ball in an unexpected location. There are many.

Therefore, it would be good if practice swings could be practiced without the head moving up and down, but for example, a frame could be set up around the player's body or head so that the head would collide with the player when the head is raised, or it could be done to prevent the head from moving. If I used a device to hold the ball down, I would be concerned about the frame, and it would be inconvenient to hit the ball with a natural form, so I couldn't practice my swing.

For this reason, there has been a need for a detection device that does not interfere with the player's swing and has a simple structure to notify that the player's head has moved up and down.

On the other hand, an aircraft is equipped with a lift gauge in order to keep the aircraft flying at a constant altitude and to correctly make scheduled changes in altitude.

This altitude meter is an instrument that uses changes in atmospheric pressure to indicate the vertical speed of an aircraft as it ascends and descends. It is desirable to equip it as an instrument to detect updrafts during takeoff and landing.

However, conventional elevation meters use diaphragms or semiconductor pressure sensors, so they have complex and precise structures that make them delicate to handle, and they are large and heavy, making them difficult to use on relatively large hang gliders. It was only equipped on.

Therefore, the inventor of the present invention first attempted to improve the frequency range outside the frequency range in which the microphone is used as an audio device, especially in the low frequency region.
We verified through experiments that the microphone output voltage is proportional to the lifting speed, and based on this fact, we invented a lift meter that uses the microphone as a micropressure sensor. This invention provides a lift gauge that is lightweight, compact, and easy to handle.

The present invention utilizes the theory of a lift meter that uses the above-mentioned microphone as a micro-pressure sensor in the low frequency range, and uses the change in atmospheric pressure when swinging a golf club, baseball bat, etc. It is an object of the present invention to provide a head vertical movement change detection device capable of detecting vertical movement of a player's head.

[Means for Solving the Problems] In order to achieve the above object, the device for detecting changes in vertical motion of the head according to the present invention has a device for detecting changes in vertical motion of the head that instantly responds to fluctuations in atmospheric pressure due to changes in altitude. a first chamber, a second chamber that communicates with the atmosphere at the height position after a time, and pressure detection means for detecting the difference in internal pressure between the first and second chambers at a certain height position; A notification means is provided for notifying changes in the vertical movement of the head based on a pressure detection signal from the pressure means.

The pressure sensing means may be, for example, a condenser microphone, and its pressure receiving surface is set at a point where the acceleration between the air flow due to the acceleration in the first room and the air flow due to the acceleration in the second room becomes zero. It is desirable to install one. As a result, the first
This is because the acceleration component due to air movement in the second room is canceled out, and only the actually desired rate of change in atmospheric pressure can be detected, resulting in more accurate results.

[Function] The head vertical movement change detecting device configured as described above is attached to the player's hat, head, etc. by any method, and a golf club, baseball bat, tennis or badminton racket, etc. swing.

At this time, when the height position of the part to which this device is attached changes before and after swinging, the first chamber, which instantly communicates with the atmosphere after the change, does not immediately communicate with the atmosphere and returns to its original position. A pressure difference is created between the chamber and the second chamber containing atmospheric air at the height.

Since atmospheric pressure is approximately proportional to height, by detecting the pressure difference with the pressure detection means, it is possible to determine how much the height position has changed during the swing. Therefore, when the change occurs for a predetermined amount or more, if the player is notified by a notification means such as a buzzer or any display means, the player can easily know that the head is up or down. For example, in the case of a buzzer, it is convenient to make the pitch, size, type, length, etc. of each sound different when the head is up or down.

After detection, the second chamber communicates with the atmosphere at a new height after a time interval (for example, several seconds) in preparation for the next detection.

Furthermore, in order to prevent malfunctions, this detection is performed only when the swing speed is higher than a predetermined speed.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 to 4 are cross-sectional views showing a first embodiment of the apparatus for detecting changes in vertical movement of the head according to the present invention. The box 1 is separated into 3 and 4 parts, and a lid 5 is provided to cover the opening 1a of the box 1.

As shown in Fig. 3, this wall surface 2 has a double cylindrical shape with an M-shaped cross section and a convex center, which separates the inside of the box 1 into two groups 3 and 4 on the opening side and the back side. ing. The chamber 3 on the open side is defined as a first chamber, and a sufficiently large air inlet hole 6 (FIG. 4) is formed in the lid 5, for example, so that the air pressure inside the chamber instantly responds to the outside atmosphere.

On the other hand, a minute gap (for example, a pinhole) 7 is formed in the wall of the box 1 so that the second chamber 4 on the back side communicates with the atmosphere through the first chamber 3 after a delay time (for example, several seconds). has been done.

Further, the second chamber 4 is filled with a spongy body 8 such as a sponge to prevent the pressure in the two chambers 3 and 4 from changing suddenly throughout the space when the atmospheric pressure changes suddenly.

Reference numeral 9 denotes a condenser microphone as a pressure detection means attached to the wall surface 2 so as to be located in the first chamber 3. Since a commercially available one used in radio-cassette players and the like is used, details of its structure will be omitted.

Further, the pressure receiving surface (electret film) 9a of the microphone 9 of this embodiment has a length L in the longitudinal direction of the second chamber 4.
If the length of the microphone 9 itself is ρ, then L/
It is best to install it at a position that is I2/2 less than position 2. This is because the acceleration is canceled out and only the moving speed of the box can be detected more accurately.

In the figure, 2a is a tongue piece formed by bending the periphery of the inner cylinder of the wall surface 2 toward the center, and 5a is a slit for coin insertion formed in the center of the lid body 5 to facilitate opening and closing of the lid body 5. It is.

FIGS. 5 and 6 show a second embodiment of the present invention, in which the first and second chambers are two large and small cylinders 10 and 11, and one large cylinder 10 contains the other small cylinder. This is an example in which 11 is enclosed.

Both ends of this large cylindrical body 10 are sealed with lids 12, and air inflow holes 13 of sufficient size are bored in the lids 12 at two symmetrical locations on the left and right sides to instantly respond to external air pressure. It is set up.

The small cylindrical body 11 is supported by a sponge 14 between it and the large cylindrical body 10, and a lid 15 is attached to one end and a microphone 9 is attached to the other end, thereby forming a substantially sealed body.

As in the first embodiment, when it is attached to the player's head and swung, the atmosphere due to the change in height instantly enters the large cylinder 10 from the air inflow hole 13, and the internal pressure of the large cylinder 10 changes. Air flows into the small cylinder 11 from the gap between the microphone 9 and the wall of the small cylinder 11 or from the gap in the microphone itself. However, since the gap is so small that it communicates with the atmosphere after a delay time, the altitude can be determined from the pressure difference between them.

In this embodiment, it is desirable to install the pressure receiving surface of the microphone so that the center of the large cylindrical body (center of length and cross section) and the center of the small cylindrical body (same as above) coincide.

Further, as a method of communicating with the atmosphere after a delay time, a pinhole was used in the first embodiment and a gap between microphones was used in the second embodiment, but the method is not limited to this, and an electric circuit may be used.

FIG. 7 is a block diagram of the electric circuit of the condenser microphone 9 of the first and second embodiments.
A bypass filter 16 cuts the DC signal, and a low-pass filter 17 cuts the audio band (bass range < 20H2).

The signal obtained there is amplified by the amplifier circuit 18, and the voltage of 10 regions and the voltage of 1 region generated when the microphone 9 moves in the vertical direction are discriminated and selected by the 10-region circuit 19, and each oscillation circuit ( The signal is input to an oscillation circuit (upward oscillation circuit) 20a and an oscillation circuit (downward oscillation circuit) 20b.

The audible range oscillation frequency obtained therein is notified to the player by a notification means 21 such as a buzzer, vibration, or a human voice using an arbitrary audio circuit.

Effects of the Invention J Since the present invention is configured as described above, this device can be attached to a player's hat or the like in any manner, and when practicing swinging with a golf club, etc. It notifies the player with a sound etc. that the game is down. Therefore, it is extremely effective in correcting the form.

What's more, you can easily practice anytime and anywhere, and you can learn the correct form without having to hold a club.

In addition, the structure is simple and suitable for mass production, and since it is made of inexpensive materials such as microphones, it is extremely practical as it can reduce manufacturing costs.

[Brief explanation of the drawing]

Figures 1 to 4 are detailed views of the main parts of the first embodiment of the head vertical movement change detection device according to the present invention, and Figures 5 and 6 are detailed views of the main parts of the second embodiment. , FIG. 7 is a block diagram of the electrical circuit of the microphone. 3.10...first house, 4.11...second house, 9
. . . Pressure detection means, 21 . . . Notification means. Patent Applicant: Toshin Electric Co., Ltd. Watanabe Ka 2nd Department Part a

Claims (3)

[Claims] (1) A first chamber whose internal pressure responds instantaneously to changes in atmospheric pressure due to changes in altitude, a second chamber that communicates with the atmosphere at that altitude after a delay time, and - A head characterized by comprising a pressure detection means for detecting a difference in the internal pressure in the second chamber, and a notification means for notifying a state of change in vertical movement of the head based on a detection signal of the pressure means. Vertical movement change detection device. (2) A claim characterized in that the pressure sensing means is a microphone, and the pressure receiving surface of the microphone is installed at a point where the acceleration of the flow of air in the first chamber and the second chamber caused by movement becomes zero. 1. The head vertical movement change detection device according to 1. (3) The apparatus for detecting changes in vertical movement of the head according to claim 1, wherein the second chamber is filled with corpus cavernosum.