JP2011061308A - Method of manufacturing ribbon microphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a ribbon microphone, and more specifically, a method of mounting a ribbon diaphragm for a ribbon microphone unit. <P>SOLUTION: The ribbon microphone includes a permanent magnet forming a magnetic field and the ribbon diaphragm 3 comprising an aluminum that is placed inside the magnetic field and vibrates in response to sound waves. The method of manufacturing the ribbon microphone includes a step in which end parts in the length direction of the ribbon diaphragm 3 are pinched with a tool 1 to the tip part of which short fibers are electrostatically transplanted to adjust tension of the ribbon diaphragm 3. The ribbon diaphragm 3 shown in Figure has parts vibrating in response to the sound waves, the parts being bent alternately in the length direction and formed into a triangular waveform, and has flat both end parts 5 in the length direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a ribbon microphone, specifically, a method for mounting a ribbon diaphragm of a ribbon microphone unit.

  The ribbon type microphone mainly includes a magnet that forms a magnetic field and a ribbon type diaphragm. The magnets are disposed at a predetermined interval to form a magnetic field between the magnets, and a ribbon diaphragm is disposed in the magnetic field. The ribbon diaphragm is usually made of an aluminum foil having a thickness of several μm. Aluminum is suitable as a ribbon diaphragm for a ribbon microphone because of its conductive resistance and specific gravity compared to other metal materials. In general, in ribbon microphones, the ribbon diaphragm is bent in multiple stages like a folding screen using gears to lower the resonance frequency, so pure aluminum with good ductility is used as the material. It is considered preferable to do this.

  3 and 4 show an example of a conventionally known ribbon type microphone unit. 3 and 4, the ribbon microphone unit includes a frame 7 formed in a rectangular frame shape that is long in the vertical direction. A pair of permanent magnets 4 and 4 are fixed to both sides of the inner surface of the frame 7 along the long side direction with a predetermined gap between the permanent magnets. The permanent magnets 4 and 4 are magnetized in the width direction (left-right direction in FIG. 3). The direction of magnetization of both permanent magnets 4 and 4 is the same, and a parallel magnetic field is formed between the permanent magnets 4 and 4.

  In the parallel magnetic field, a ribbon-shaped diaphragm (hereinafter simply referred to as “ribbon”) 3 serving as a diaphragm and a conductor is disposed. The ribbon 3 has an elongated band shape, and both end portions in the length direction are fixed to electrode lead portions 6 and 6 provided at both end portions in the length direction of the frame 7. The electrode lead portions 6 and 6 are insulated from the frame 7, and terminal plates 9 and 9 are fixed to the electrode lead portions 6 and 6. When the holding members 8 and 8 are screwed into the terminal plates 9 and 9 with screws 10 in a state where an appropriate tension is applied to the ribbon 3, both end portions 5 and 5 of the ribbon 3 are connected to the terminal plates 9 and 9 and the holding members 8 and 9, respectively. 8 is sandwiched between. In this way, the electrode lead portions 6 and 6 are electrically connected via the ribbon 3. A slight gap exists between both side surfaces of the ribbon 3 and the permanent magnets 4 and 4 facing the ribbon.

  The ribbon 3 is formed in a triangular wave shape in which portions other than both end portions 5 and 5 corresponding to the electrode lead portions 6 and 6 are alternately bent at regular intervals in the length direction. The direction of the line formed by this bending, that is, the direction of the line drawn by the top and bottom of the triangular wave peak is the width direction of the ribbon 3, and these lines are formed at regular intervals.

  The direction in which the ribbon 3 oscillates upon receiving a sound wave is a direction in which the magnetic flux between the permanent magnets 4 and 4 is cut off. The ribbon 3 made of a conductor generates power by cutting off the magnetic flux. An electrical signal is generated between the drawer portions 6 and 6. Since this electrical signal becomes a signal of frequency and amplitude corresponding to the frequency and amplitude of the ribbon 3, it is converted into an electrical signal corresponding to the sound wave received by the ribbon 3.

  Since the ribbon microphone configured as described above is bidirectional, and the control method of the bidirectional ribbon microphone is mass control, the tension of the ribbon 3 is set so that the resonance frequency is low. Set very low. The ribbon 3 is formed in a triangular wave shape by alternately bending the vibrating portions other than both end portions 5 and 5 at regular intervals in the length direction, thereby realizing low tension. Further, the lower reproduction limit can be made lower as the resonance frequency of the ribbon 3 is lower.

  However, if the tension for pulling the ribbon is too low, wind and vibrations are applied, causing problems such as the ribbon 3 coming into contact with the magnetic pole. For this reason, in the manufacturing process of the ribbon microphone and the ribbon microphone unit, the ribbon 3 needs to be applied with appropriate tension from both ends. However, the material of the ribbon 3 is an aluminum foil as described above, and is generally made as thin as 2 μm. Therefore, when the end portion 5 of the ribbon 3 is pulled with a tool 1 such as tweezers used daily as shown in FIGS. 5 and 6, the stress is concentrated on a part of the tip of the tool 1, The ribbon 3 may be torn off. In addition, since it is held at a point, when a stress is applied, a rotating force acts on the diaphragm, and the ribbon 3 may be twisted.

  Although there is a method using tweezers with a flat tip, since the thickness of the ribbon 3 is as thin as 2 μm as described above, the end of the ribbon 3 cannot be held uniformly, and the ribbon 3 is deformed. Since the deformed ribbon 3 cannot be restored, there is a problem that the yield deteriorates and the cost of the ribbon microphone increases.

JP 2009-135630 A JP 2009-105506 A

  The present invention eliminates the problems of the prior art described above, improves the yield when tension is applied to the ribbon when mounting the ribbon during the manufacturing process of the ribbon type microphone and the ribbon type microphone unit, and the ribbon. An object of the present invention is to provide a ribbon microphone unit and a ribbon microphone manufacturing method that do not cause troubles such as distortion and deformation.

  The present invention relates to a method for manufacturing a ribbon microphone including a permanent magnet that forms a magnetic field and a ribbon diaphragm made of aluminum that is placed in the magnetic field and vibrates in response to a sound wave. The most important feature is that it includes a step of adjusting the tension while pulling the ribbon diaphragm and sandwiching the end in the length direction of the ribbon diaphragm.

  As in another embodiment of the present invention, the ribbon diaphragm may be formed in a triangular wave shape by alternately bending portions that vibrate upon receiving a sound wave in the length direction.

  According to the present invention, when the ribbon is mounted during the manufacturing process of the ribbon type microphone or the ribbon type microphone unit, it is possible to prevent the ribbon from being distorted or deformed when tension is applied to the ribbon. The yield of manufacturing a microphone can be improved.

It is the front view (a) which shows the example of the tool which carried out electrostatic flocking for implementing the manufacturing method of the ribbon type microphone concerning this invention, and a side view (b). They are the front view (a) and the side view (b) which show the state where the above-mentioned electrostatic flocking tool pinched the ribbon. It is a front view which shows the example of the conventional ribbon type microphone unit. It is a longitudinal cross-sectional view of the said prior art example. It is the front view (a) which shows the example of the tool for implementing the manufacturing method of the conventional ribbon type microphone, and a side view (b). It is the front view (a) which shows the state which pinched | interposed the ribbon with the said conventional tool, and a side view (b).

  Hereinafter, an embodiment of a method for manufacturing a ribbon microphone according to the present invention will be described with reference to FIGS. The feature of the present invention resides in a method for mounting a ribbon diaphragm (hereinafter simply referred to as “ribbon”), and the other steps are the same as in the prior art.

  In FIG. 1A, the tool 1 is tweezers. In the frontal shape of the tool 1, the tool 1 is gradually elongated toward the end in the length direction, and the narrowed end is used as the tip 2 of the tweezers. In FIG.1 (b), the tool 1 is comprised combining two board | plates. The two plates are gently raised in opposite directions and arcuately toward the distal direction (downward in FIG. 1), and the side opposite to the distal end, that is, the base end side is flat. Are joined together. Therefore, when the tool 1 is sandwiched and pressed from the left and right in FIG. 1 by a hand, it has a shape having a general tweezers function capable of picking up an object at the tip portion. The shape of the tool 1 is not limited to that described above, and any suitable shape can be selected as long as it functions as a general tweezer.

  Electrostatic flocking is carried out at the tip portions 2 of the two plates constituting the tool 1. Electrostatic flocking is a technique that is already widely used. Adhesive is applied to the tip portion 2 of the two plates, and a high voltage is applied to the tool 1 to fly the pile toward the adhesive application portion. It is planted by. The tip portion 2 can be electrostatically implanted by such a general appropriate method, and the length direction of the pile and the bonding surface of the tip portion 2 of the tool are perpendicular to each other. Further, as the electrostatic flocking of the tip portion 2 of the tool 1, a fiber having the surface electrostatically flocked may be attached to the tip portion 2 of the tool 1. As a material of the tool 1, an appropriate material can be selected as long as it is an elastic material that can function as tweezers, such as a natural substance such as bamboo or wood, or a metal. The piles that have been flocked are individually elastic. Thus, when the end portion of the ribbon 3 is sandwiched between the tools 1, many piles can be bent and held at many points without causing the ribbon 3 to be deformed. Therefore, even if the ribbon 1 is stretched with the tool 1, no rotating stress is generated. As the pile, suitable fibers generally used for electrostatic flocking can be used, and examples thereof include polyamide synthetic fibers and cellulose fibers.

  In FIG. 2, the end portion 5 of the ribbon 3 is sandwiched by the tip portion 2 of the tool 1 in which electrostatic flocking is performed. In the ribbon microphone unit shown in the prior art of FIGS. 3 and 4, when the ribbon 3 is mounted, the end 5 on one side of the ribbon 3 is pinched by the tip 2 of the tool 1 and placed on the terminal plate 9. Thereafter, the end portion 5 is fixed to an arbitrary fixing member having a screw hole with a screw 10. The other end 5 of the ribbon 3 which is not fixed is again picked up by the tip 2 of the tool 1 and stretched by the appropriate force described above, and a fixing member and screw having an arbitrary screw hole in the terminal plate 9 on the opposite end side shown in the figure. Fix with 10.

  As described above, when the ribbon is mounted in the manufacturing process of the ribbon type microphone and the ribbon type microphone unit, when the tension is applied to the ribbon, there is no trouble such as distortion or deformation of the ribbon. The yield in the manufacturing process of the type microphone unit or ribbon type microphone can be improved. The present invention can be applied to ribbon mounting as described in Patent Document 1 already described, and can also be applied to mounting ribbons of any other shape.

  The ribbon type microphone unit shown in FIGS. 3 and 4 can be configured as a ribbon type microphone by incorporating it into a microphone case and providing a connector for connecting to the outside. That is, the manufacturing method of the ribbon type microphone unit of the present invention plays a part of the entire manufacturing method of the ribbon type microphone.

  The method of manufacturing the ribbon microphone unit and the ribbon microphone according to the present invention is not particularly limited in use, but is suitable for mounting a ribbon made of aluminum foil, and other thin metal members are used. It can also be used when implementing.

1 Tool 2 Tip 3 Ribbon Type Diaphragm (Ribbon)

Claims (2)

A ribbon-type microphone manufacturing method comprising: a permanent magnet that forms a magnetic field; and a ribbon-type diaphragm made of aluminum that is disposed in the magnetic field and vibrates by receiving sound waves,
A method of manufacturing a ribbon type microphone, comprising a step of adjusting a tension while pulling the ribbon type diaphragm by sandwiching a lengthwise end part of the ribbon type diaphragm with a tool in which a tip portion is electrostatically implanted .   2. The method of manufacturing a ribbon microphone according to claim 1, wherein the ribbon diaphragm is formed in a triangular wave shape by alternately bending portions that vibrate upon receiving a sound wave, and both end portions in the length direction are flat. .

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