JP2015023324A - Capacitor microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong support structure of higher rigidity so that a microphone unit does not respond to torque applied by a sound wave arriving from a direction other than the sound collection axis, in a side entry type capacitor microphone.SOLUTION: A capacitor microphone includes a microphone unit 2 having a ring-shaped support frame 4 on the periphery, and a microphone base 6. On the microphone base, a pair of left and right struts 51, 52 standing vertically are provided. When screwing the support frame between the struts so that the sound collection axis A of the microphone unit becomes substantially horizontal, first and second screw points F1, F2 arranged at a predetermined interval in the vertical direction are provided for one strut, while at least one screw point F3 is provided for the other strut, as the screw points for screwing the support frame to the two struts.

Description

  The present invention relates to a condenser microphone. More specifically, the present invention relates to a condenser microphone that is of a side entry type and has a microphone unit with increased mounting rigidity to further improve sound quality.

  Condenser microphones include end address type microphones and side entry type microphones in terms of the direction in which sound waves are captured.

  Although not shown, in the end address type microphone, the microphone unit is housed in a cylindrical unit case, and sound waves are mainly taken into the microphone unit from the front end portion of the unit case.

  On the other hand, in the side entry type microphone, as described in Patent Document 1, for example, the microphone unit is arranged substantially vertically in a cylindrical unit cover made of, for example, a metal net, and the unit cover The sound wave is taken into the microphone unit from the direction orthogonal to the cylindrical axis.

  This type of condenser microphone unit usually uses a circular microphone unit including a diaphragm stretched on a circular diaphragm ring and a fixed pole supported by an insulating seat as a counter electrode. It is held on the microphone base via a mount member including the support frame.

  However, in the case of the side entry type, since the microphone unit is not directly fixed in the unit case as in the end address type, the support structure of the microphone unit becomes a problem.

  For example, as shown in FIG. 4 introduced as a prior art in Patent Document 1, in a mode in which one point on the lower end side of a microphone unit is supported on a microphone base via a support member, vibration or the like applied to the microphone The microphone unit easily swings and is likely to generate vibration noise.

  Therefore, in the invention described in Patent Document 1, as shown in FIGS. 1 and 2, the microphone unit is fitted into the central portion of the plate-like elastic body, and the upper and lower ends of the plate-like elastic body are connected to the unit. It has been proposed to be fixed to the case.

  According to this, since the microphone unit is held in a plate-like elastic body that is supported at two upper and lower points and the microphone unit hardly swings due to vibration applied to the microphone, vibration noise can be reduced.

JP 2006-18825 A

  However, as described above, even if the microphone unit is held in a plate-like elastic body that is supported at two upper and lower points, if sound waves are applied to the microphone unit, for example, from the 45 ° direction of the sound collection axis, A force that rotates the microphone unit is generated.

  Although this rotational force is extremely small, especially in side-entry condenser microphones that require high sound quality for professional use such as studio recording, the microphone unit does not move slightly due to sound waves applied from directions other than the sound collection axis. A rigid and strong support structure is required.

  Accordingly, an object of the present invention is to provide a rigid support that is more rigid so that the microphone unit does not respond to a rotational force applied by a sound wave coming from a direction other than the sound collection axis in a side-entry condenser microphone. To provide a structure.

In order to solve the above problems, the present invention includes a microphone unit including a diaphragm and a fixed pole and having a ring-shaped support frame attached to the periphery thereof, and a microphone base. A pair of left and right support columns that rise substantially vertically with a spacing substantially equal to the diameter of the support frame is provided, and the support frame is screwed between the support columns so that the sound collection axis of the microphone unit is substantially horizontal. Side entry type condenser microphone
As a screwing position for screwing the support frame to the support column, the support frame is fixed to the one support column by first and second two screws arranged at a predetermined interval in the vertical direction. And has at least one screwing point for the other support column.

  In the present invention, it is preferable that the support frame has first and second screwing portions arranged at a predetermined interval in the vertical direction with respect to the other support column.

  In addition, it is preferable that the first and second screwing locations are arranged symmetrically with respect to a horizontal plane including the sound collection axis of the microphone unit.

  Further, for facilitating the screwing operation, a screw insertion hole formed on the support column side and a female screw hole formed on the support frame side coaxially with the screw insertion hole are provided at the screw fixing portion. Are preferably provided.

  According to the present invention, when the microphone unit support frame is screwed between the pair of left and right columns so that the sound collection axis of the microphone unit is substantially horizontal, the support frame is perpendicular to one column. Screwed at two first and second screwing points arranged at predetermined intervals in the direction, and at least one screwing point (total of three points) for the other column, preferably the one of the above Since it is screwed at the first and second screwing points (total of four points) arranged at a predetermined interval in the vertical direction, as with the support column, the sound waves coming from directions other than the sound collection axis The microphone unit can be firmly supported with high rigidity so that the microphone unit does not respond to the applied rotational force.

1 is a cross-sectional view showing the front of a condenser microphone according to an embodiment of the present invention. Sectional drawing which shows the right side surface of the said condenser microphone.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2, but the present invention is not limited to this.

  As shown in FIGS. 1 and 2, the condenser microphone 1 includes a microphone unit 2 having a disk shape, the sound collection axis A of which is substantially horizontal (the sound receiving surface is substantially vertical), and the microphone via a mount member 5. This is a side entry type condenser microphone supported by a base 6.

  The microphone unit 2 is configured by disposing a diaphragm stretched on a diaphragm ring and a fixed pole supported by an insulating seat through a separator ring. Of these components, only the diaphragm 21 is shown.

  The microphone unit 2 includes a circular ring-shaped support frame 4 on the periphery thereof. The support frame 4 is a frame for screwing the microphone unit 2 to the mount member 5 and may be formed of an aluminum material or the like.

  The microphone base 6 is formed in a cylindrical shape by, for example, a brass material (brass alloy), and an output transformer 10 is accommodated in the microphone base 6. In addition, a connector portion 63 having a microphone connector MC inside is integrally provided at the bottom of the microphone base 6.

  As shown in FIG. 1, the mount member 5 has a pair of left and right support columns 51, 52 that rise substantially vertically from the microphone base 6 at a distance substantially equal to the diameter of the support frame 4. A disk-shaped top plate 53 is attached to the upper ends of the first and second plates.

  In this embodiment, the columns 51 and 52 are screwed to locking recesses 61 and 62 formed at positions facing the microphone base 6 at 180 ° so that their upper ends rise substantially vertically. The columns 51 and 52 are preferably made of a highly rigid metal material.

  A circuit board 7 on which an audio signal output circuit including an FET (field effect transistor) as an impedance converter is mounted is screwed between the support columns 51 and 52 near the microphone base 6 side.

  When an electromagnetic wave radiated from a cellular phone or the like is exposed to the circuit board 7, a high-frequency current due to the electromagnetic wave is detected by the FET, and noise may be generated. Noise may also be generated when the circuit board 7 is vibrated by the incoming sound wave.

  In consideration of this point, in this embodiment, a shielding dome 8 made of a metal material for shielding the circuit board 7 from the outside is screwed between the support columns 51 and 52, and the microphone base 6 is attached to the microphone base 6. Is covered with a cylindrical shield case 91 made of a metal material surrounding the circuit board 7.

  The microphone unit 2 is supported between the support columns 51 and 52. However, the microphone unit responds to the rotational force applied by the sound wave coming from a direction other than the sound collection axis A, for example, from an oblique 45 ° direction (rotation). In order to prevent this, in this embodiment, the microphone unit 2 is screwed to the support columns 51 and 52 at two places on one side, for a total of four places.

  These four screwing points are F1 to F4, the two screwing points F1 and F2 are arranged on the left column 51 in FIG. 1, and the remaining two screwing points F3 and F4 are on the right side in FIG. It is arranged on the column 52.

  The screwing location F1 includes a screw insertion hole 511 drilled on the support column 51 side and a female screw hole 41 formed on the support frame 4 side coaxially with the screw insertion hole 511. Includes a screw insertion hole 512 formed on the support column 51 side and a female screw hole 42 formed on the support frame 4 side so as to be coaxial with the screw insertion hole 512.

  Similarly, the screwing point F3 includes a screw insertion hole 521 formed on the support column 52 side and a female screw hole 43 formed on the support frame 4 side so as to be coaxial with the screw insertion hole 521. The location F4 includes a screw insertion hole 522 formed on the support column 52 side, and a female screw hole 44 formed on the support frame 4 side so as to be coaxial with the screw insertion hole 522.

  According to this, the female screw holes 41, 42, 43, 44 are matched with the corresponding screw insertion holes 511, 512, 521, 522, and a male screw (not shown) is screwed into the female screw from the screw insertion hole. Thus, the microphone unit 2 can be rigidly supported at four points with respect to the support columns 51 and 52.

  In this case, as shown in FIG. 1, one screwing point F1 and F2, and the other screwing point F3 and F4 are vertically symmetrical with respect to a virtual horizontal plane X including the sound collection axis A, respectively, The screwing locations F1 and F2 and the other screwing locations F3 and F4 are arranged symmetrically with respect to the virtual vertical plane Y including the sound collection axis A, so that if only one location is aligned, Since three positions are aligned, the screwing operation can be easily performed.

  Further, as shown in FIG. 1, by making the mounting surface of the support frame 4 with respect to the columns 51 and 52 flat, no excessive stress is applied to the support frame 4, that is, without changing the tension of the diaphragm 21. Thus, a stronger support structure can be obtained.

  As described above, after the microphone unit 2 is screwed to the support columns 51 and 52, a microphone case 9 made of, for example, a metal net is covered with the microphone unit 2 to obtain a final product form.

  In the above-described embodiment, four screw points are fixed to the columns 51 and 52 of the microphone unit 2; however, for example, the screw points on the column 52 side may be one point and may be fixed to three points. In this case, it is preferable to arrange the one place on the virtual plane X including the sound collection axis A.

  Further, when the microphone unit 2 is a square unit having a diaphragm ring as a rectangular frame, the support frame 4 may be formed into a rectangular frame in accordance with this, and such an embodiment is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Capacitor microphone 2 Microphone unit 4 Support frame 41-44 Female screw hole 5 Mount member 51,52 Support | pillar 511,512,521,522 Screw insertion hole 53 Top plate 6 Microphone base 7 Circuit board 8 Shielding dome 9 Microphone case 91 Shield Case F1 to F4 Screw fixing point

Claims (4)

A microphone unit including a diaphragm and a fixed pole and having a ring-shaped support frame attached to the periphery thereof, and a microphone base, the microphone base being substantially vertical with an interval substantially equal to the diameter of the support frame In the side-entry type condenser microphone in which a pair of left and right support columns rising up is provided, and the support frame is screwed between the support columns so that the sound collecting axis of the microphone unit is substantially horizontal,
As a screwing position for screwing the support frame to the support column, the support frame is fixed to the one support column by first and second two screws arranged at a predetermined interval in the vertical direction. A condenser microphone having a location and having at least one screw location for the other support column.   The said support frame has the 1st, 2nd screwing location arrange | positioned by predetermined spacing in the orthogonal | vertical direction also with respect to the said other support | pillar, The Claim 1 characterized by the above-mentioned. Condenser microphone.   3. The condenser microphone according to claim 1, wherein the first and second screwing locations are arranged symmetrically with respect to a horizontal plane including a sound collection axis of the microphone unit.   The screw fixing portion is provided with a screw insertion hole drilled on the support column side and a female screw hole formed on the support frame side coaxially with the screw insertion hole. Item 4. The condenser microphone according to any one of Items 1 to 3.

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