JPH06100491B2 - Microphone moving device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone moving device for measuring a sound energy flow to perform sound source search and radiated sound distribution measurement.

2. Description of the Related Art Japanese Patent Laid-Open No. 59-61721 discloses a conventional microphone moving device.
Some of them use the ball screw shown in Japanese Patent Publication No. The front view is shown in FIG.

As shown in FIG. 6, this type of device has a configuration using a horizontal X-axis ball screw and a vertical Y-axis ball screw. That is, Y on the nut A21 on the X-axis ball screw 20.
The shaft fixing base 22 is connected, and a Y-axis ball screw is set upright on the fixing base. Then, put the nut on the Y-axis ball screw 23.
By sliding B24 and attaching the microphone to the microphone fixing base joined to the nut B, the microphone can be moved on the XY plane.

Problems to be Solved by the Invention In such a structure, the fulcrum of the Y-axis is one point, and the lower part has to be heavy in order to improve the balance of the Y-axis. Moreover, a robust Y-axis fixing base was required to increase the strength of the fulcrum. For this reason, the weight of the moving device becomes very heavy, which is difficult to move and install, and the flat plate portion of the Y-axis fixed base easily reflects sound, which disturbs the measurement sound field and prevents accurate measurement. There was a problem.
In addition, this device could not move on a horizontal plane, and could not measure the distribution of sound radiated upward from the upper surface of the device.

As described above, the conventional microphone moving device has a problem in that the moving device is difficult due to its heavy weight and that the measurement accuracy is lowered due to the reflection of sound from the Y-axis fixed base.

The present invention is to solve such conventional problems, by using a lightweight and thin tube structure, it is possible to perform acoustic measurement without being affected by the reflection of sound, it is possible to easily install the microphone moving device, The purpose is to efficiently perform acoustic measurement from the direction suitable for the measurement purpose.

Means for Solving the Problems In order to solve the above problems, a microphone moving device of the present invention is a frame body in which each side of a rectangular parallelepiped is formed by a thin tube,
An upper sliding part that slides on the upper horizontal thin tube of the frame body with wheels, and a lower sliding part that slides on the lower horizontal thin tube of the frame body with wheels supported by leaf springs. , A moving shaft configured by connecting the upper sliding part and the lower sliding part with a thin tube, and projecting from four corners of the frame body in a direction perpendicular to a surface on which the moving shaft slides. A horizontal installation column, and the upper sliding portion and the lower sliding portion have a first annular belt and a second sliding belt provided along a narrow tube.
Of the first belt and the second belt which are joined to each other at each point of the belt and are rotated by a toothed pulley connected by a moving shaft drive motor and a joint rod. A microphone fixing base that is configured to move in parallel on one plane of the body, and that holds a microphone that is vertically slidable on the moving shaft by the rotation of a third annular belt installed along the moving shaft. A balancer portion having a weight substantially equal to the weight of the microphone fixing base and the microphone is provided on the third ring-shaped belt so as to be detachable, and a sandwiching portion for sandwiching the belt is provided.

Effect The present invention makes it possible to reduce the weight of the frame body, reduce the number of flat portions, and perform acoustic measurement without being affected by the reverberation of sound.

Furthermore, since this device is lightweight and has a rectangular parallelepiped structure, it can be easily installed not only vertically, but also horizontally, so that the radiation distribution of sound on many measurement surfaces can be easily measured. it can.

And since the upper and lower sliding parts are driven at the same time, it can slide smoothly, and since the vibration of the motor is isolated by the leaf spring, acoustic measurement is possible even while sliding the microphone. is there.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 to 5, 1 is a thin tube, 2 is a moving shaft, 3 is a microphone fixing base, 4 is a microphone, 5 is a moving shaft driving motor, 6 is a microphone fixing base moving motor,
Reference numeral 7 is an upper sliding portion that slides on the moving shaft, 27 is a lower sliding portion that slides on the moving shaft, 8 is a sliding portion that slides on the microphone fixing base, 9 is a first annular belt, and 9 ' Is the second loop belt,
10 is a third ring-shaped belt for moving the microphone fixing base, 11
Is a pulley that holds one end of the first, second, and third annular belts, 12 is a toothed pulley that rotates the first, second, and third annular belts, 13 is a joint rod that transmits the rotation of the motor, 14 is a vertical installation table, 15 is a horizontal installation table, 16 is a balancer section, 17 is a sandwiching section, 18 is a horizontal installation column, 19 is a leaf spring,
20 is a wheel and 21 is a wheel fixing part.

The microphone moving device having such a configuration can move the microphone as follows. That is, the rotation of the motor 5 causes the belts 9 and 9'to rotate, and the upper and lower sliding portions 7 and 27 connected to one point of the belts 9 and 9'can slide simultaneously in the same direction. . Therefore, the moving shaft 2 can be moved in parallel in the horizontal direction while remaining vertical. This direction is the X axis. Then, as the motor 6 rotates, the belt 10 rotates, and the sliding portion 8 connected to one point of the belt 10 can slide vertically on the moving shaft. This direction is the Y-axis direction.

In this way, the two motors drive the microphone XY
It can be moved to any position on the plane.

In such a microphone moving device, since the main body is configured by a thin tube in a rectangular parallelepiped structure, the frame body can be made lightweight, and the flat portion is reduced, and measurement can be performed without being affected by sound reflection. Is something that can be done.

When measuring the sound reflection distribution, it is possible to move the microphone to any number of measurement points in a short time, improve the measurement efficiency, and perform more detailed measurement. The accuracy can be improved.

Further, not only the vertical installation but also the horizontal installation can be easily performed as shown in FIG. 3, and it can be arbitrarily moved to a measurement point on a horizontal plane.

That is, the horizontal installation column 18 can be fixed by being fitted into the horizontal installation table 15 and held at the height of the horizontal installation table 15. These four horizontal installation bases 15 and the frame body 24
The sound generated by placing the object to be measured in the space surrounded by can be measured. Further, as shown in FIG. 5, the sliding portion has a wheel structure in which a thin tube is sandwiched, so that the wheel does not come off even when installed horizontally. Furthermore, since the other wheel is pressed against the thin tube from the one sliding portion by the leaf spring, it is possible to slide more stably even when installed in the horizontal direction.

Therefore, by using this device, which allows the microphone to move freely on the vertical plane and the horizontal plane, it is possible to measure the distribution of sound radiation from the device not only from the front and side directions but also from the top direction. Therefore, it is possible to understand in detail the noise and sound generation phenomenon.

In addition, in a two-dimensional microphone moving device, normally, in order to stop the microphone at the measurement point, it is necessary to apply a stationary current to the motor 6 to obtain a stationary torque in order to prevent the microphone from falling due to its own weight. However, when the static current is passed, the balance between the static torque of the motor and the attractive force of the magnet of the motor is not stable, which causes vibration in the rotation direction, which causes vibration noise. In order to eliminate this phenomenon, in this microphone moving device, when the microphone fixing base is located at the uppermost point of the movement axis, the microphone fixing is performed at the lowest point of the belt side facing the joining point of the microphone fixing base. We decided to provide a balancer section that matches the weight of the stand and microphone. As a result, the microphone can be stopped without applying a quiescent current to the motor.

Furthermore, when measuring while rotating the motor, that is, when measuring while moving the microphone, the vibration of the motor is transmitted to the microphone through the moving shaft, so the lower sliding part is isolated from vibration via the leaf spring. I decided to make it a structure. As a result, even while rotating the motor,
The vibration is not transmitted to the microphone, and it is possible to measure the sound while moving the microphone.

In addition, when the microphone is installed in the horizontal direction, the microphone does not drop by its own weight. Therefore, it is desirable to remove the balancer from the viewpoint of operability. Therefore, the balancer section
It can be easily removed from the belt by releasing the holding part.

EFFECTS OF THE INVENTION As described above, according to the present invention, acoustic measurement can be performed with less influence of sound reflection, measurement accuracy can be improved, and the thin tube frame body is finished in a lightweight manner. It has the effect of easy installation. Also,
It is a system that can move the microphone on a horizontal plane or a vertical plane, can measure from any angle, and can provide data that allows detailed understanding of the phenomenon of noise-like sounds. By providing a balancer part, the microphone can be stopped without passing the quiescent current of the motor,
Electric power can be saved and a stable stationary state can be obtained, which has the effect of improving measurement accuracy.

Further, since the moving shaft is configured such that the upper and lower sliding portions are vertically slid simultaneously by the drive motor and the joint rod, there is no vertical shift and smooth sliding is possible. The balancer is easy to remove when measuring in the horizontal direction, and the balancer is provided with a horizontal installation column that projects vertically from the four corners of the frame body to the surface on which the moving shaft slides. It is possible to install the frame body horizontally using the installation pillar as a pillar. Further, since the lower sliding portion slides on the wheel instructed by the leaf spring, it is difficult for the vibration of the motor to be transmitted, and acoustic measurement can be performed while sliding.

[Brief description of drawings]

FIG. 1 is a front view of a microphone moving apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the apparatus, FIG. 3 is a side view showing another installation configuration of the apparatus, and FIG. 4 is the apparatus. FIG. 5 is a side view of the lower sliding part of the same device, and FIG. 5 is a side view of the conventional microphone moving device. 1 ... narrow tube, 2 ... moving axis, 3 ... microphone fixing base, 4 ... microphone, 7 ... upper sliding part, 9 ... first annular belt, 9 '... second annular belt, 10 …… Third ring belt, 12 …… Toothed pulley, 13 …… Joint rod, 17 …… Holding part, 18 …… Horizontal installation pillar, 19 …… Plate spring, 20 …… Wheels, 24 …… Frame body, 27 …… Lower sliding part.

Claims (1)

[Claims] 1. A frame body in which each side of a rectangular parallelepiped is formed of a thin tube, an upper sliding portion that slides on wheels on an upper horizontal thin tube of the frame body, and a lower horizontal thin tube of the frame body. Of the frame body, a lower sliding portion that slides on a wheel supported by a leaf spring, a moving shaft configured by connecting the upper sliding portion and the lower sliding portion with a thin tube, A horizontal installation column that protrudes from four corners in a direction perpendicular to the surface on which the moving shaft slides, and the upper sliding portion and the lower sliding portion are provided along a thin tube. Of the first circular belt and the second circular belt which are respectively joined at respective points, and the movable shaft is rotated by a toothed pulley connected to a movable shaft drive motor by a joint rod and the first circular belt. Parallel movement on one plane of the frame body with 2 ring belts And a microphone fixing base for holding a microphone that is vertically slidable on the moving shaft by rotation of a third annular belt installed along the moving shaft, the microphone fixing base, and the microphone. A microphone moving device having a sandwiching portion that sandwiches the belt with a structure in which a balancer portion having a weight substantially equal to that of the third annular belt can be detached from the third annular belt.