JP6265539B2 - Capacitor headphone unit and method of manufacturing capacitor headphone fixed pole assembly - Google Patents

Description

  The present invention relates to a capacitor headphone unit and a method for manufacturing a fixed pole assembly of a capacitor headphone.

In the capacitor headphone unit, the fixed pole and the diaphragm are arranged to face each other via a spacer, and a signal voltage for audio reproduction is applied to the fixed pole in a state where a polarization voltage of several hundred volts is applied to the diaphragm. Thus, the diaphragm is vibrated to output a sound wave.
Also, the capacitor headphone unit generally employs a push-pull drive type in which fixed poles are arranged on both sides of the diaphragm in order to reduce reproduction distortion.

  In this case, the fixed pole is configured to be flat, and a plurality of through holes are formed for transmitting sound waves from the opposing diaphragms. Each of the plurality of through-holes is generally circular, and if the inner diameter of the through-hole is large, the effective area of the fixed pole is reduced, so that the sensitivity as a headphone unit is lowered. For this reason, it is necessary to make a large number of through holes having a small inner diameter in the fixed pole.

By the way, when the thickness dimension of the fixed electrode is large, the workability for drilling a large number of the through holes described above is deteriorated, and in addition, the length in the thickness direction of the through holes is increased. This acts as an acoustic mass and causes a decrease in sensitivity of the headphone unit.
For this purpose, the fixed electrode is made of a metal plate (generally 0.8 mm or less in thickness) thinner than the diameter of the through hole, and the through hole is formed by mechanical pressing or chemical etching. To be made.

Further, since the diaphragm described above is electrostatically driven by an audio signal voltage applied between the fixed pole and the fixed pole is thin, the mechanical strength of the fixed pole is insufficient. Thus, the fixed pole vibrates due to the reaction force of the diaphragm.
In order to avoid this, a means for arranging a reinforcing plate on the fixed pole to prevent vibration of the fixed pole is employed. (For example, see Patent Document 1 and Patent Document 2)

JP 2008-172472 A JP 2008-258864 A

By the way, the peripheral part of the diaphragm described above is fixed by, for example, a holding ring, and a predetermined tension is applied to the diaphragm. Therefore, the vibration of the diaphragm is greatly oscillated as compared with the peripheral portion.
In addition, when the diaphragm and the fixed pole come into contact with each other during operation, a large noise is generated, and further, a problem arises in that a current flows between the diaphragm and the fixed pole to damage the diaphragm.
In order to solve such a technical problem, it is desirable that the central portion of the fixed pole is set to be curved outward with respect to the diaphragm.

  The present invention has been made in consideration of the above-mentioned specific problems of the capacitor headphone unit, and utilizes the above-described reinforcing plate for preventing the vibration of the fixed pole, so that the fixed pole is placed outside the fixed pole. Manufacture of a condenser headphone unit and a fixed pole assembly having a fixed pole assembly that can arbitrarily set the degree of bending and can effectively prevent the diaphragm from coming into contact with the fixed pole due to vibration of the diaphragm It is an object to provide a method.

  A capacitor headphone unit according to a first embodiment of the present invention made to solve the above-described problem includes a diaphragm and a fixed pole provided with a plurality of through holes arranged to face the diaphragm. In the condenser headphone unit, a coupling metal fitting with a screw hole is attached to the back surface of the fixed pole facing the diaphragm, and is inserted into a reinforcing plate arranged opposite to the coupling metal fitting. The fixing screw is screwed into the screw hole of the coupling fitting, whereby the central portion of the fixed pole is bent toward the reinforcing plate.

  In addition, a capacitor headphone unit according to a second embodiment of the present invention, which has been made to solve the above-described problems, includes a diaphragm and a plurality of through holes disposed on both sides of the diaphragm so as to face the diaphragm. A capacitor headphone unit provided with a pair of fixed poles applied, and on the back surface of each fixed pole facing the diaphragm with a center, a coupling fitting having a screw hole is attached, By screwing a fixing screw inserted into each reinforcing plate arranged to face each of the coupling fittings into a screw hole of each of the coupling fittings, the center portion of each of the fixing poles is placed outside the respective fixing poles. It was made to curve toward each said reinforcement board arrange | positioned in (3).

In this case, each outer shape of the diaphragm, the fixed pole, and the coupling metal is preferably formed in a circular shape, and a configuration in which the coupling metal is attached concentrically to the fixed pole is preferably adopted. Can do.
In addition, preferably, the coupling fitting, the reinforcing plate, and the fixing screw are each formed of a metal material.

  On the other hand, the manufacturing method of the fixed pole assembly used for the capacitor headphone unit according to the first aspect of the present invention is a coupling metal fitting in which a screw hole is formed on one surface of a fixed pole provided with a plurality of through holes. A first step of attaching the fixing pole, and attaching an insulating seat formed in a ring shape to the periphery of the fixed pole, and confronting the surface of the fixed pole to which the fitting is attached, and a reinforcing plate via the insulating seat A second step of arranging in a stacked state, a third step of inserting a fixing screw into the reinforcing plate and screwing the fixing screw into a screw hole drilled in the coupling metal, and coupling at the fixed pole And a fourth step of attaching a diaphragm to the back surface of the mounting surface of the metal fitting so as to be opposed to the fixed pole through an insulating seat attached to the peripheral edge of the fixed pole.

  The method of manufacturing the fixed pole assembly used in the capacitor headphone unit according to the second aspect of the present invention includes a coupling fitting in which a screw hole is formed on one surface of a fixed pole provided with a plurality of through holes. A first step of attaching the fixing pole, and attaching an insulating seat formed in a ring shape to the periphery of the fixed pole, and confronting the surface of the fixed pole to which the fitting is attached, and a reinforcing plate via the insulating seat From the second step of arranging in a stacked state, the third step of inserting a fixing screw into the reinforcing plate, and screwing the fixing screw into the screw hole drilled in the coupling metal, and the first step A pair of assemblies obtained by the third step is prepared, the fixed poles of the respective assemblies are made to face each other, and vibration is generated between the fixed poles via an insulating seat attached to the peripheral edge of each fixed pole. Including a fourth step of arranging the plate. The features.

  In any of the manufacturing methods described above, it is desirable to execute a step of adjusting the degree of screwing of the fixing screw into the screw hole formed in the fitting after the third step or the fourth step. As a result, the central portion of the fixed pole can be set to a desired degree of curvature.

According to the method of manufacturing the headphone unit and the fixed pole assembly according to the present invention, the coupling fitting and the reinforcing plate having the screw holes are disposed on the back surface of the fixed pole facing the diaphragm. And the said fixed pole can be bent to the reinforcement board side with the fixing screw screwed together by the said coupling metal fitting.
Accordingly, the reinforcing plate can prevent the fixed pole from vibrating due to the reaction force of the diaphragm during the operation of the headphone unit, and the contact with the fixed pole due to the vibration of the diaphragm can be effectively prevented. .

Furthermore, since the degree of curvature of the fixed pole can be set by adjusting the degree of screwing of the fixed screw into the screw hole formed in the coupling metal, the fixed pole and the diaphragm in each fixed pole assembly It is also possible to contribute to eliminating the variation in capacitance between the two.
According to this, particularly in a push-pull drive type headphone unit in which fixed poles are arranged before and after a diaphragm, the sensitivity of the vibration direction of the diaphragm (capacitance before and after the diaphragm) can be adjusted. Therefore, a headphone unit with less reproduction distortion can be realized.

It is sectional drawing which shows the diaphragm and insulation seat which comprise the capacitor | condenser headphone unit which concerns on this invention. Similarly, it is a front view of a single fixed pole. It is a front view of a reinforcing plate alone. It is a front view of a coupling metal piece similarly. (A)-(C) are process drawings explaining the manufacturing method of a fixed pole assembly. (D)-(F) is process drawing explaining the manufacturing method of the fixed pole assembly following FIG.

Hereinafter, a capacitor headphone unit according to the present invention will be described based on an embodiment of a push-pull pull drive type capacitor headphone unit shown in the drawings.
1 to 4 show the respective components constituting the capacitor headphone unit, and the fixed electrode assembly of the capacitor headphone unit combining these components is shown in a sectional view in FIG. 6 (F). .

For the diaphragm used in the capacitor headphone unit, for example, a synthetic resin film such as PET (polyethylene terephthalate) or PPS (polyphenylene sulfide) is used, and a metal vapor deposition film is formed on the synthetic resin film.
The diaphragm 11 is stamped and formed into a circular shape, and a pair of holding rings 12 are attached to both surfaces of the peripheral edge of the diaphragm 11 as shown in FIG. Thus, the diaphragm 11 is in a state where a predetermined tension is applied by the holding ring 12.

  The holding ring 12 holding the diaphragm 11 is supported so as to be sandwiched by a support surface 13a formed on an insulating seat 13 formed in a ring shape. The metal fixed poles 14 that are also supported by the insulating seats 13 are arranged opposite to each other with a predetermined interval before and after the diaphragm 11. That is, the metal vapor deposition film formed on the vibration plate 11 and the fixed electrodes 14 before and after the metal deposition film are supported in an electrically insulated state by the insulating seat 13.

As shown in FIG. 2, for example, the fixed pole 14 is formed by punching a metal plate having a thickness of about 0.5 mm into a circular shape having a diameter of about 100 mm, and excluding the peripheral portion thereof. A plurality of circular through holes 14a are formed so as to occupy most of the center.
The plurality of through holes 14 a formed in the fixed pole 14 function as sound guide holes that allow sound waves generated based on the vibration operation of the diaphragm 11 to pass therethrough.

On the other hand, FIG. 3 shows a coupling fitting 15 formed in a ring shape, and this coupling fitting 15 is formed of the fixed pole 14 facing the diaphragm 11 as will be described later with reference to FIGS. It is attached to the back surface concentrically with the fixed pole 14 using, for example, an adhesive.
A plurality (three in the illustrated example) of screw holes 15a are formed in the coupling metal 15 at equal intervals along a ring-shaped locus.

FIG. 4 shows a reinforcing plate 16 attached to the back side of the fixed pole 14 facing the diaphragm 11. That is, the reinforcing plate 16 is disposed outside the fixed pole 14 with the coupling fitting 15 shown in FIG.
The reinforcing plate 16 has substantially the same diameter as that of the diaphragm 11 described above, and as shown in FIG. 4, six circular shapes are formed around a circular opening 16b formed in the center portion. The openings 16a are provided at equal intervals in the circumferential direction.

  An insertion hole 16c of a fixing screw 17 to be described later that is screwed to the coupling fitting 15 is formed between the central opening 16b of the reinforcing plate 16 and the surrounding opening 16a. That is, the insertion hole 16c is formed at a position corresponding to the three screw holes 15a formed in the coupling fitting 15 in a state where the reinforcing plate 16 is mounted.

  5 and 6 illustrate a manufacturing process for assembling the fixed electrode assembly of the capacitor headphone unit using the members shown in FIGS. The manufacturing process described below is directed to a fixed-pole assembly of a push-pull drive type capacitor headphone unit in which fixed poles are arranged on both front and rear sides with a diaphragm at the center.

First, as shown in FIG. 5A, the coupling fitting 15 is attached to one surface of the fixed pole 14 concentrically with the fixed pole 14 using an adhesive, for example (first step).
Subsequently, as shown in FIG. 5B, an insulating seat 13 formed in a ring shape is attached to the peripheral portion of the fixed pole 14. And as shown in FIG.5 (C), the reinforcement board 16 is arrange | positioned in the state piled up through the said insulating seat 13 facing the surface of the fixed pole 14 to which the said coupling metal fitting 15 was attached. Second step).
In this state, a gap is formed between the coupling fitting 15 attached to the fixed electrode 14 and the reinforcing plate 16.

Then, the screw hole 15a drilled in the coupling metal 15 and the insertion hole 16c formed in the reinforcing plate 16 are aligned, and the reinforcing plate 16 is formed as shown in FIG. 6 (D). The fixing screw 17 is screwed into the screw hole 15a of the coupling fitting 15 through the insertion hole 16c (third step).
FIG. 6 (E) shows a state in which the fixing screw 17 is screwed into the innermost part of the screw hole 15a formed in the connecting metal fitting 15, so that the central portion of the fixed pole 14 is connected to the connecting hole 15. It is set in a curved state toward the reinforcing plate 16 through the metal fitting 15.

In this embodiment, two fixed pole assemblies (a pair of fixed pole assemblies) assembled through the above-described steps are prepared. As shown in FIG. 6 (F), the fixed pole assemblies of the respective assemblies are prepared. 14 (a pair of fixed poles 14) are opposed to each other, and the diaphragm 11 is disposed between the fixed poles 14 via an insulating seat 13 attached to the peripheral edge of each fixed pole (fourth step). .
In this case, as described with reference to FIG. 1, the pair of holding rings 12 attached to both sides of the peripheral portion of the diaphragm 11 are sandwiched by the support surfaces 13 a formed on the insulating seat 13 formed in a ring shape. Supported.
As a result, a push-pull drive type capacitor headphone unit (fixed pole assembly) in which the fixed poles 14 are arranged on both front and rear sides with the diaphragm 11 in the center is formed.

In the fixed pole assembly shown in FIG. 6 (F), the fixing pole 14 is preferably adjusted by adjusting the degree of screwing of the fixing screw 17 into the screw hole 15a formed in the coupling fitting 15. The central portion can be set to a desired degree of curvature.
The operation of adjusting the fixed pole 14 to a desired degree of curvature can also be executed in the state shown in FIG. 6E after the third step described above, but in particular, the fixed pole 14 before and after the diaphragm 11. In the push-pull drive type headphone unit in which is arranged, it is desirable to adjust after the fourth step shown in FIG.

This is because, after the fourth step shown in FIG. 6 (F), while measuring each electrostatic capacity of the front and rear fixed poles 14 with respect to the diaphragm 11, By adjusting the degree of screwing of the fixing screws 17 to each other, the sensitivity in the vibration direction of the diaphragm 11 (capacitance before and after the diaphragm) can be adjusted. As a result, it is possible to realize a headphone unit with little reproduction distortion.
After the fixing screw 17 is adjusted, it is desirable to fix the fixing screw 17 to that state by applying an adhesive, for example, to the head of the fixing screw 17.

  5 and 6 show the assembly process of the push-pull drive type headphone unit as described above, but the single drive type headphone unit in which the fixed pole 14 is arranged to face only one surface of the diaphragm 11. 6 (E), the diaphragm 11 held by the holding ring 12 is opposed to the fixed pole 14, and the holding ring 12 is attached to the insulating seat 13 in the same manner. In addition, a single drive type fixed pole assembly can be formed.

  In the above-described embodiment, it is desirable that the coupling fitting 15, the reinforcing plate 16, and the fixing screw 17 are formed of a metal material. The electrode lead-out configuration can be facilitated.

DESCRIPTION OF SYMBOLS 11 Diaphragm 12 Holding ring 13 Insulating seat 13a Support surface 14 Fixed pole 14a Through-hole 15 Coupling metal fitting 15a Screw hole 16 Reinforcement plate 16a Opening 16b Opening 16c Insertion hole 17 Fixed screw

Claims (7)

A condenser headphone unit including a diaphragm and a fixed pole provided with a plurality of through holes disposed to face the diaphragm,
A coupling fitting having a screw hole is attached to the back surface of the stationary pole facing the diaphragm, and a fixing screw inserted into a reinforcing plate arranged to face the coupling bracket is attached to the coupling bracket. A capacitor headphone unit, wherein a central portion of the fixed pole is bent toward the reinforcing plate by being screwed into a screw hole. A condenser headphone unit comprising a diaphragm and a pair of fixed poles each provided with a plurality of through holes disposed on both sides of the diaphragm so as to face the diaphragm,
On the back surface of each fixed pole facing the diaphragm in the center, a coupling fitting having a screw hole is attached, and the fixed fitting inserted into each reinforcing plate arranged opposite to each coupling fitting. A screw is screwed into a screw hole of each of the coupling fittings, so that a center portion of each of the fixed poles is curved toward each of the reinforcing plates disposed outside the respective fixed poles. Condenser headphone unit.   The outer shape of each of the diaphragm, the fixed pole, and the coupling metal is formed in a circular shape, and the coupling metal is attached concentrically to the fixed pole. Capacitor headphone unit described in 1.   The condenser headphone unit according to any one of claims 1 to 3, wherein the coupling fitting, the reinforcing plate, and the fixing screw are formed of a metal material. A method of manufacturing a fixed pole assembly used in a condenser headphone unit,
A first step of attaching a coupling fitting having a threaded hole to one surface of a fixed pole provided with a plurality of through holes;
An insulating seat formed in a ring shape is attached to the peripheral portion of the fixed pole, and a reinforcing plate is arranged in a state of being overlapped via the insulating seat so as to face the surface of the fixed pole to which the coupling fitting is attached. Two steps,
A third step of inserting a fixing screw into the reinforcing plate and screwing the fixing screw into a screw hole drilled in the coupling fitting;
A fourth step of attaching a diaphragm on the back surface of the mounting surface of the coupling metal fitting in the fixed pole so as to face the fixed pole via an insulating seat attached to the peripheral edge of the fixed pole;
A method of manufacturing a fixed pole assembly comprising: A method of manufacturing a fixed pole assembly used in a condenser headphone unit,
A first step of attaching a coupling fitting having a threaded hole to one surface of a fixed pole provided with a plurality of through holes;
An insulating seat formed in a ring shape is attached to the peripheral portion of the fixed pole, and a reinforcing plate is arranged in a state of being overlapped via the insulating seat so as to face the surface of the fixed pole to which the coupling fitting is attached. Two steps,
A third step of inserting a fixing screw into the reinforcing plate and screwing the fixing screw into a screw hole drilled in the coupling fitting;
A pair of assemblies obtained by the first to third steps are prepared, and both the fixed poles of the respective assemblies are made to face each other via an insulating seat attached to the peripheral edge of each fixed pole. A fourth step of disposing a diaphragm between the poles;
A method of manufacturing a fixed pole assembly comprising:   After the third step or the fourth step, the central portion of the fixed pole is set to a desired degree of curvature by adjusting the degree of screwing of the fixing screw into the screw hole formed in the coupling fitting. The method of manufacturing a fixed pole assembly according to claim 5, further comprising a step.

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