JP5058746B2 - Ribbon microphone ribbon manufacturing method and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a ribbon microphone manufacturing method and a manufacturing apparatus thereof.

  The ribbon microphone mainly includes a magnet that forms a magnetic field and a ribbon diaphragm. The magnets are arranged on both sides of the ribbon diaphragm, and a magnetic field is formed between the magnets on both sides. The ribbon diaphragm is disposed in the magnetic field while appropriate length is applied to hold both ends in the length direction. When the ribbon diaphragm receives the sound wave and vibrates in the magnetic field, a current corresponding to the sound wave flows through the ribbon diaphragm, and the sound wave is converted into an electric signal. Conventionally, aluminum foil has been widely used as a material for the ribbon diaphragm. Aluminum is suitable as a ribbon-type diaphragm for a ribbon microphone because aluminum has better conductivity and lighter specific gravity than other metal materials.

  FIG. 4 shows an example of a general ribbon microphone. 5 and 6 show a ribbon microphone unit built in the ribbon microphone. In FIG. 4, the ribbon microphone 1 includes a cylindrical base 6 and a microphone case 2 connected to the upper end of the base 6 to form a microphone housing. In this casing, the ribbon microphone unit 3 is assembled to an appropriate support member fixed to the base 6, and the microphone unit 3 is covered with the microphone case 2. The lower end portion of the base portion 6 is a connector portion 16 for connecting a microphone cable for guiding the output signal of the microphone to an external circuit.

  As shown in FIGS. 5 and 6, the ribbon microphone unit 3 includes a frame 7 formed in a rectangular frame shape that is long in the vertical direction. On the inner side surface of the frame 7, a pair of permanent magnets 4, 4 are fixed on both sides along the long side direction with a predetermined interval between the permanent magnets 4, 4. The permanent magnets 4, 4 are magnetized in the width direction (left-right direction in FIGS. 4 and 5), and the magnetization directions of the pair of permanent magnets 4, 4 are the same. Therefore, a parallel magnetic field is formed between the permanent magnets 4 and 4.

  In the parallel magnetic field, a ribbon type diaphragm (hereinafter also simply referred to as “ribbon”) 5 serving as a diaphragm and a conductor is disposed. The ribbon 5 has an elongated strip shape, and both end portions in the length direction are fixed to electrode lead portions 18 and 18 provided at both end portions in the length direction of the frame 7. The electrode lead-out portions 18 and 18 are insulated from the frame 7 and are electrically connected to the ribbon 5 by sandwiching both end portions of the ribbon 5 with the sandwiching member 8, and the ribbon 5 is subjected to an appropriate tension. Holding. Both ends of the ribbon 5 are formed in a triangular wave shape by alternately bending the portions 51 other than the electrode lead portions 18 and 18 at regular intervals. The direction of the line formed by the bending, that is, the direction of the line drawn by the crest and trough of the triangular wave is the width direction of the ribbon 5, and the lines are formed at regular intervals. Hereinafter, the corrugated end portions 51 of the ribbon 5 are referred to as corrugated end portions 51. A terminal plate 9 is superimposed on the holding member 8 at both ends. These terminal plates 9 are electrically connected to the respective ends of the ribbon 5 through the holding members 8 and output signals from the ribbon microphone unit 3 from the respective terminal plates 9. . An intermediate portion of the ribbon 5 sandwiched between the corrugated end portions 51 of the ribbon 5 is a direction perpendicular to the direction of the line drawn by the top and valley bottom of the triangular wave of the corrugated end portion 51, that is, a line in the length direction of the ribbon 5. A corrugated intermediate portion 52 in which a top and a valley bottom of a triangular wave are formed.

  The ribbon 5 receives the sound wave and vibrates according to the sound wave. This vibration direction is a direction that crosses the magnetic flux between the permanent magnets 4, 4, and the ribbon 5 made of a conductor crosses the magnetic flux to generate power, and between the longitudinal ends of the ribbon 5, and thus the electrode lead-out portions 9, 9. An electric signal is generated between them. Since this electric signal is a signal having a frequency and an amplitude corresponding to the frequency and the amplitude of the ribbon 5, the sound wave hitting the ribbon 5 is converted into an electric signal corresponding to the sound wave. Since the ribbon type microphone is an inertia control system, the resonance frequency of the ribbon 5 needs to be lower than the low frequency of the sound wave to be collected, in other words, lower than the lowest frequency of the frequency band where sound can be collected. is there. For this reason, the tension of the ribbon 5 is set very low. As described above, the ribbon 5 is bent into a corrugated shape to realize a low tension.

  In the example of the ribbon microphone described above, the intermediate portion in the longitudinal direction of the ribbon 5 is the corrugated intermediate portion 52 in which the top and bottom of the triangular wave are formed along the longitudinal line of the ribbon 5. . The ribbons of many conventional ribbon microphones are formed so that the direction of the line drawn by the crest and trough of the triangular wave is the width direction of the ribbon over the entire length direction. In other words, the triangular wave is formed so as to travel over the entire length direction. In order to manufacture a ribbon having such a shape, conventionally, a pair of spur gears having teeth formed of triangular crests and troughs formed at regular intervals on the outer periphery has been used. The pair of spur gears have the same specifications as well as the tooth pitch and radius. An operator places a pair of spur gears on a smooth substrate, for example, a glass substrate, sandwiches the aluminum foil that is the material of the ribbon 5 between the pair of spur gears, and presses the pair of spur gears against each other while facing each other. Rotate to the above and feed out the above material. By doing so, the tooth shape of the pair of spur gears is transferred to the material, and the corrugated ribbon as described above is formed.

  However, the ribbon manufacturing method using the spur gear as described above has the following technical problems. Aluminum foil, which is a typical material for ribbon-type diaphragms, is torn off when a strong tension is applied partially. Carefully and carefully, from one end to the other in the length direction, a pair of spur gears. It is necessary to bend it while applying a uniform force. However, according to the manufacturing method using a pair of spur gears as described above, the formation of the aluminum foil is likely to be uneven due to the force applied to the pair of spur gears, and the aluminum foil often swells or twists. When waviness or twist occurs in the aluminum foil, even if it is attached as a ribbon between the pair of magnets 4, 4, it does not fit between the magnets 4, 4 but comes into contact with the magnets 4, 4. Therefore, the number of ribbons that a skilled worker can manufacture for use per day is several, and it is considered that this is a difficult process with extremely low yield.

  The problems of the conventional ribbon type microphone include not only the problem of manufacturing the ribbon type diaphragm but also the structure. As described above, many conventional ribbon-type diaphragms are formed such that a triangular wave travels over the entire length direction, and both ends in the length direction are fixed. Therefore, when a strong impact force or wind pressure is applied and the ribbon diaphragm is stretched, the lengthwise center of the ribbon diaphragm is loosened and comes into contact with the permanent magnets 4 and 4. .

  On the other hand, as in the example of the ribbon 5 shown in FIG. 4 to FIG. 6, the corrugated intermediate portion 52 sandwiched between the corrugated ends 51 at both ends becomes a line in the length direction of the diaphragm 5. According to what the triangular wave top and valley bottom are formed along, the portion that is plastically deformed by a strong impact or wind is near the corrugated end 51, so that the corrugated intermediate portion 52 does not loosen, Contact with the magnetic pole can be prevented.

  As a method for manufacturing a ribbon diaphragm, a method has been proposed in which a diaphragm material is molded into a corrugated shape using a mold composed of an upper mold and a lower mold (see, for example, Patent Document 1). However, the method for manufacturing a ribbon described in Patent Document 1 is a method for manufacturing a ribbon diaphragm for a ribbon-type speaker. When this manufacturing method is applied to a manufacturing method of a ribbon diaphragm made of a material such as an extremely thin aluminum foil, such as a ribbon microphone diaphragm of a ribbon microphone, the material of the diaphragm is broken, and the ribbon microphone is used. It is impossible to produce a ribbon.

  As a measure for improving such problems of the prior art, the present applicant has temporarily fixed the surface of the transfer mold on the surface of the transfer mold in which the shape of the surface is the same as that of the ribbon to be molded. And a method for manufacturing a ribbon for a ribbon microphone, in which a roller having an elastic member on an outer peripheral surface is rolled while pressing the elastic member against the ribbon material, thereby transferring the surface shape of the transfer mold onto the ribbon material. Proposed (see, for example, Patent Document 2). It has also been suggested that the elastic member of the roller should be formed by electrostatic flocking.

  According to the invention described in Patent Document 2, the ribbon material is temporarily fixed to the transfer mold, and it is possible to prevent undulation, twisting, and the like of the ribbon during molding. The ribbon can be easily formed by rolling from one end of the ribbon toward the other end while pressing the elastic body of the roller against the ribbon. In particular, by using a roller in which an elastic member is formed by electrostatic flocking and pressing the ribbon against the transfer mold at the tip of the elastic member, even if the shape to be transferred to the ribbon is complicated, it can be easily transferred.

JP 57-44397 A JP 2007-49324 A

  Even in the invention described in Patent Document 2 having many advantages as described above, it has been found that there are problems due to the use of rollers. That is, when the roller on which the elastic member is formed does not move linearly on the ribbon but moves in a wavy manner, the ribbon may be partially broken. Further, when the ribbon is released from the transfer mold after being formed, there may be a problem that the ribbon correlates with the movement trajectory of the roller.

  The present invention has been made in view of such problems of the prior art, and the ribbon does not partially break, and when the ribbon is molded and released from the transfer mold, the ribbon undulates. An object of the present invention is to provide a ribbon microphone ribbon manufacturing method and a manufacturing apparatus thereof that can be easily formed into a predetermined shape without being generated, and that can be manufactured with a high yield.

  A method for manufacturing a ribbon for a ribbon microphone according to the present invention includes a step of placing a ribbon material on the surface of a transfer mold in which the shape of the surface is the same as the shape of a ribbon for a ribbon microphone, and the material of the ribbon A step of placing a weight implanted on a flat surface with the flocked surface facing downward, a step of vibrating the transfer mold together with the weight, and transferring the surface shape of the transfer mold to the material of the ribbon; And a step of removing the weight from the ribbon material and taking out the ribbon from the transfer mold.

  An apparatus for manufacturing a ribbon for a ribbon microphone according to the present invention includes a transfer mold having a surface shape that is the same as that of a ribbon for a microphone microphone, and an elastic member on a plane, which is placed on the surface of the transfer mold. A weight for pressing the elastic member against the ribbon material and transferring the surface shape of the transfer mold onto the ribbon material; and a vibrator for vibrating the transfer mold together with the weight. Main features.

  An innumerable flocked surface formed on the weight by placing a ribbon material on the transfer mold, placing the flocked surface of the weight having a flocked surface on the transfer mold, and vibrating the transfer mold together with the weight. The ribbon material is pressed against the surface of the transfer mold, and the surface shape of the transfer mold is transferred to the ribbon material to produce a ribbon microphone ribbon. When the transfer mold vibrates with the weight, the ribbon material is gradually formed, and the elastic member of the weight bends corresponding to the uneven shape on the surface of the transfer mold, so that the pressing force is concentrated locally on the ribbon material. In this way, partial breakage of the ribbon material can be prevented. Further, since the weight presses the entire ribbon material at the same time and is vibrated in this state, the ribbon material is not twisted.

Embodiments of a ribbon microphone ribbon manufacturing method and a manufacturing apparatus thereof according to the present invention will be described below with reference to the drawings.
First, an embodiment of a production apparatus for carrying out the method for producing a ribbon for a ribbon microphone according to the present invention will be described. In FIG. 1, a ribbon type microphone ribbon manufacturing apparatus includes a transfer mold 60 and a weight 12. The transfer mold 60 has a transfer surface on the upper surface, and a ribbon-type microphone ribbon material 50 is placed on the transfer surface. The transfer mold 60 has a length substantially matching the length of the ribbon material 50. The transfer surface has the same shape as the ribbon to be manufactured. That is, on the transfer surface, corrugated portions 61 and 61 having a sinusoidal cross section are formed near both ends in the length direction, and a region in the middle in the length direction sandwiched between the corrugated portions 61 and 61 is uneven. A forming part 62 is formed. The wave forming portions 61 and 61 are portions for forming the wave end 51 in the example of the ribbon shown in FIGS. The concave / convex forming portion 62 is a portion for forming the corrugated intermediate portion 52 if the ribbon having the shape shown in FIGS. 4 to 6 is formed.

  The concavo-convex forming portion 62 is subjected to a texture or a satin finish so that fine concavo-convex portions are formed irregularly but uniformly. It is an example that irregularities are irregularly formed by applying a texture or pear finish to the irregularities forming portion 62, and is not limited to a texture or pear finish. In addition, irregularities may be regularly arranged in the irregularity forming part 62. In short, the presence of the irregularity forming part 62 is sufficient if a ribbon capable of maintaining a certain degree of rigidity can be formed. The uneven shape of the uneven portion 62 is not limited to a specific shape. For example, as in the conventional example shown in FIGS. 4 to 6, a groove having a triangular cross-section extending in the length direction of the ribbon may be formed in an uneven shape for forming the grooves at regular intervals in the width direction of the ribbon. The material of the transfer mold 60 may be metal or plastic.

  In order to temporarily fix the ribbon material 50 placed on the surface of the transfer mold 60, the transfer mold 60 is formed with an exhaust hole 63 that leads from the back surface (bottom surface) of the transfer mold 60 to the surface. Although the number of the exhaust holes 63 is arbitrary, it is preferable that there are a total of three at least near the center in the length direction and near both ends in the length direction of the transfer mold 60 as shown in FIG. The ribbon material 50 can be temporarily fixed to the surface of the transfer mold 60 by placing the ribbon material 50 on the surface of the transfer mold 60 and exhausting it from the exhaust port 20. The exhaust pressure at this time may be a weak negative pressure that does not cause the ribbon material to be displaced.

  The weight 12 has a flocked surface 14 in which fibrous hairs are uniformly planted on substantially the entire lower surface in the figure of the flat weight main body. The fibrous bristles are composed of short fibers, and the length and thickness depend on the size and depth of the irregularities formed on the surface of the ribbon molding transfer mold 60. For example, a fiber having a thickness of 3.3 decix and a length of about 0.3 to 1.0 mm may be used. In order to obtain the flocked surface 14 having such specifications, an electrostatic flocking technique may be used.

  The transfer mold 60 is mounted on a vibrator (not shown). The vibration exciter applies vibration to the transfer mold 60 together with the weight 12. A vibration is applied with an acceleration of about 100 Hz and an acceleration of about 0.5 G by a vibrator.

  Next, an embodiment of a method for manufacturing a ribbon for a ribbon microphone using the above manufacturing apparatus will be described. First, a ribbon material 50 for a ribbon microphone, for example, an aluminum foil is positioned and placed on the surface of the transfer mold 60. Next, a pump or the like (not shown) is activated to exhaust the air in the exhaust port 63, and the ribbon material 50 is temporarily fixed to the surface of the transfer mold 60 by setting the exhaust port 63 to a negative pressure. Next, the elastic member forming surface of the weight 12, that is, the flocked surface 14 is placed on the ribbon material 50. Innumerable hairs forming the flocked surface 14 act as an elastic body, and the load of the weight 12 is uniformly applied to the entire surface of the ribbon material 50 through the innumerable hairs. Next, the transfer mold 60 is vibrated together with the weight 12 by a vibrator (not shown).

  When the transfer mold 60 is vibrated together with the weight 12, the countless hairs of the weight 12 are bent and stretched corresponding to the irregularities on the surface of the transfer mold 60, and the ribbon material 50 is pressed against the surface of the transfer mold 60. Is transferred to the ribbon material 50. Accordingly, the corrugated end portions 51 and 51 having the same shape as the corrugated forming portions 61 and 16 are formed near both ends in the length direction of the ribbon material 50, and the transfer mold is formed in a region sandwiched between the corrugated end portions 51 and 51. A concave-convex intermediate portion having the same shape as the concave-convex forming portion 62 of 60 is formed. If the ribbon 5 having the same shape as the ribbon shown in FIGS. 4 to 6 is manufactured, the concave / convex forming portion 62 of the transfer mold 60 has the same concave / convex shape as the corrugated intermediate portion 52 of the ribbon 5. The corrugated intermediate portion 52 is formed on the ribbon 5 by the portion 62. The state of the transfer process as described above is shown in FIG.

  In the example of the weight 12 shown in FIGS. 1 to 3, countless fibrous hairs as elastic members are formed in a direction perpendicular to the lower surface of the weight 12 to form the flocked surface 14. For this reason, the ribbon material 50 is pressed against the surface of the transfer mold 60 by gradually coming into contact with the ribbon material 50 placed on the surface of the transfer mold 60 from the tip of the hair, and the ribbon material 50 becomes the surface shape of the transfer mold 60. Are molded into the same shape. In addition, since the transfer mold 60 is vibrated together with the weight 12, even if the uneven shape of the transfer mold 60 is complicated, the uneven shape of the transfer mold 60 can be faithfully and easily transferred to the ribbon material 50. Can do.

  FIG. 3 shows a process in which the transfer process is finished, the operation of the vibrator is stopped, the weight 12 is separated from the transfer mold 60, and the ribbon material 50 is released from the transfer mold 60. The ribbon material 50 formed in the same shape as the transfer surface of the transfer mold 60 is manufactured by releasing the exhaust from the exhaust hole 63 to release the temporary fixing to the transfer mold 60 and releasing from the transfer mold 60. finish. In the ribbon material 50, corrugated end portions 51, 51 are formed near both ends, and an intermediate concavo-convex portion 55 is formed in an intermediate portion sandwiched between the corrugated end portions 51, 51, whereby a ribbon microphone ribbon is formed. Will be manufactured. By forming the intermediate uneven portion 55 on the ribbon 5, the elongation of the intermediate portion sandwiched between the corrugated end portions 51 and 51 is limited.

As shown in FIGS. 4 and 5, the ribbon manufactured as described above is attached to a frame and placed in a magnetic field, thereby completing a microphone unit of a ribbon type microphone. When the ribbon receives sound waves, the corrugated end portions 51 and 51 are mainly bent and vibrated.
According to the embodiment of the ribbon-type microphone ribbon manufacturing method and manufacturing apparatus according to the present invention described above, the following functions and effects can be obtained in addition to the functions and effects described above.
1. Ribbon is manufactured by pressing and transferring the ribbon material to the transfer mold instead of manufacturing the ribbon by press-fitting by gear meshing or mold fitting. Can be manufactured.
2. The transfer mold may be a single unit, for example, it is not necessary to create a male mold and a female mold, and high-precision processing for mold matching is not necessary. In addition, since the mold material can be plastic, the cost of the mold is low.
3. Even if the uneven shape of the mold is complicated, since the ribbon material is gradually plastically deformed and formed on the flocked surface of the weight, the ribbon can be easily manufactured without requiring skill in the work.
4). Since the ribbon is gradually formed while vibrating the transfer die together with the flat plate-like weight, local stress is not applied to the ribbon, and molding defects such as waviness can be avoided. Further, a ribbon can be formed with a high yield by a simple process.

It is a partial cross section side view which shows the Example of the manufacturing method of the ribbon for ribbon microphones concerning this invention, and its manufacturing apparatus. It is a partial cross section side view which shows the process in the middle of the manufacturing method concerning the said Example. It is a partial cross section side view which shows the last process of the manufacturing method concerning the said Example. It is a partial cross section front view which shows the example of a common ribbon type microphone. It is a front view showing an example of a general ribbon type microphone unit. It is side surface sectional drawing which shows the example of the said general ribbon type microphone unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ribbon-type microphone 2 Microphone case 3 Ribbon-type microphone unit 4 Magnet 5 Ribbon-type diaphragm 51 Wave-shaped edge part 55 Middle uneven | corrugated | grooved part 6 Base 7 Frame 8 Nipping member 9 Terminal board 12 Flat plate weight 14 Hair transplant part 16 Connector part 18 Electrode lead-out part 60 Transfer mold 61 First transfer part 62 Second transfer part

Claims (9)

Placing the material of the ribbon on the surface of the transfer mold in which the shape of the surface is formed in the same shape as the shape of the ribbon for the ribbon type microphone;
A step of placing a weight planted on a flat surface of the ribbon material with the planted surface facing down,
Vibrating the transfer mold together with the weight, and transferring the surface shape of the transfer mold to the ribbon material;
And a step of removing the weight from the ribbon material and taking out the ribbon from the transfer mold.   2. The method for manufacturing a ribbon for a ribbon microphone according to claim 1, wherein the material of the ribbon is temporarily fixed on the surface of the transfer mold.   3. The method of manufacturing a ribbon for a ribbon type microphone according to claim 2, wherein the ribbon material is temporarily fixed by exhausting from an exhaust hole communicating with the surface of the transfer mold.   The manufacturing method of the ribbon for ribbon type microphones of Claim 1 which uses the weight in which the flocking surface is formed by electrostatic flocking. A transfer mold in which the shape of the surface is the same as the shape of a ribbon for a ribbon microphone; and
A weight for transferring the surface shape of the transfer mold to the ribbon material by pressing the elastic member against the ribbon material placed on the surface of the transfer mold having an elastic member on a plane;
An apparatus for manufacturing a ribbon for a ribbon type microphone, comprising: a vibrator for vibrating the transfer mold together with the weight.   6. The ribbon type ribbon manufacturing apparatus according to claim 5, wherein the transfer mold has an exhaust hole communicating with the surface of the transfer mold in order to temporarily fix the ribbon material on the surface of the transfer mold.   6. The ribbon microphone manufacturing apparatus according to claim 5, wherein the surface of the intermediate portion in the longitudinal direction of the transfer mold is subjected to a texture or a satin finish.   The ribbon microphone microphone manufacturing apparatus according to claim 5, wherein the elastic member is a fibrous hair formed on a plane of the weight. 9. The ribbon type microphone ribbon manufacturing apparatus according to claim 8 , wherein the fibrous hair is formed in a direction perpendicular to the plane of the weight by electrostatic flocking.

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