JP4638853B2 - Condenser microphone - Google Patents

Description

  The present invention relates to a condenser microphone in which an excellent shielding effect against electromagnetic waves can be obtained while a microphone cover is detachably connected to a microphone body.

  Since the condenser microphone includes a microphone unit including an impedance converter (FET), the condenser microphone is formed so as to suppress noise generation by ensuring a shielding effect against the external electromagnetic wave over the entire length.

In addition, some condenser microphones can be installed on the side of the installation body, including desks and floors, without making the presence inconspicuous. This type of microphone is called a boundary microphone (surface pickup microphone). Yes. Among them, the above-mentioned type installed on the floor is known to have a flat posture as disclosed in Patent Document 1 below.
JP-A-2005-333180

  On the other hand, the desk-top boundary microphone makes the presence of the microphone inconspicuous by projecting the microphone cover side, which is the minimum required for sound collection, onto the desk and storing the microphone body, which is the main body, in the desk. .

  FIG. 2 is an explanatory view of an example of a condenser microphone formed as a conventional tabletop boundary microphone, in which (a) shows a longitudinal sectional structure, and (b) shows (a). It is principal part explanatory drawing shown in the state which removed the microphone cover.

  According to the figure, a condenser microphone 1 installed on an installation body D such as a desk, for example, has a microphone body 2 having a microphone unit 5 on the tip side, and is electrically connected to the microphone body 2 side so as to cover the microphone unit 5. At least a microphone cover 8 that is detachably connected is formed.

  Among these, the microphone body 2 formed of, for example, a conductive alloy such as brass has a cylindrical main body portion 3 and extends from the front end of the main body portion 3 in a direction perpendicular to its length and is stretched on the outer peripheral side. And a hook-like connecting part 4 provided with an annular protrusion 4b from the peripheral side of the hook part 4a. In addition, the drawer | drawing-out code | symbol 6 in a figure shows the output unit accommodated in the microphone body 3. FIG.

  On the other hand, the microphone cover 8 having a substantially U-shaped cross section and formed in a net shape with a conductive metal has an open end portion 8a inserted into the air space 7 side secured inside the annular protrusion 4b of the hook-like connecting portion 4. Have.

  For this reason, the microphone cover 8 is integrally connected to the microphone body 2 by being inserted into the hook-like connecting portion 4 side of the microphone body 2 through the open end portion 8a and then applying an appropriate adhesive 9. Will be able to.

  Further, when the inspection / repair is necessary, the microphone cover 8 for removing the adhesive 9 can be removed from the microphone body 2 side.

  However, since the condenser microphone 1 is connected to the microphone cover 8 via the open end 8a that is meshed with the microphone body 2, the electrical continuity between the two is ensured through point contact. However, there is an inconvenience that it is difficult to secure a sufficient shielding effect against strong electromagnetic waves emitted by mobile phones.

  In particular, the condenser microphone 1 used as a desktop boundary microphone is installed on the surface of the installation body D with the hook-shaped connecting portion 4 and the microphone cover 8 projecting, so that a mobile phone can be used at a close range. If broken, there was a problem that a lot of noise was generated.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, the present invention is a capacitor capable of ensuring an excellent shielding effect against external electromagnetic waves while allowing the microphone cover side to be detachably connected to the microphone body side. The purpose is to provide a microphone.

  The present invention has been made to achieve the above-mentioned object, and a microphone body having a microphone unit disposed on the tip side and a microphone unit covering the microphone unit and electrically connecting to the microphone body side are detachably connected. In the condenser microphone including at least a microphone cover, the microphone body includes a cylindrical main body portion and a one-side connecting portion extending to a distal end side of the main body portion, and the microphone cover includes: A net-like cover main body portion covering the microphone unit side, and an other side connection portion attached to the open end side of the cover main body portion and arranged to face the one side connection portion, the one side connection portion and the other side The most important feature of the connecting portion is that a set screw is screwed into a screw hole provided in a positional relationship that meets each other in a face-to-face relationship, and is detachably connected. .

  In this case, the microphone body is housed in an opening portion of an installation body including a desk partitioned through an opening edge so that the microphone unit side protrudes, and the other connection portion of the microphone cover includes the opening edge side. It is preferable to provide a hook part that can be freely hooked to the hook.

  According to the first aspect of the present invention, the microphone body and the microphone cover are screwed into a screw hole provided in a positional relationship where the microphone body and the microphone cover face each other. Since the connecting portion and the other-side connecting portion can be brought into surface contact and connected with each other with certainty of electrical continuity, an excellent shielding effect against external electromagnetic waves can be provided over the entire length of the condenser microphone.

  According to the invention of claim 2, the microphone body is accommodated in the installation body by projecting the microphone unit side, and is hooked on the opening edge side of the installation body via the flange provided on the other side connection portion of the microphone cover. Therefore, it can be suitably used as a desktop boundary microphone.

  FIG. 1 is an explanatory view showing an example of the present invention formed as a desktop boundary microphone, in which (a) shows a longitudinal sectional structure, and (b) shows a microphone cover per (a). It is principal part explanatory drawing shown in the removed state.

  According to the figure, a condenser microphone 11 installed through an opening 52 of an installation body D such as a desk, for example, includes a microphone body 12 having a microphone unit 17 on the tip side, and a microphone body 12 covering the microphone unit 17. A microphone cover 22 that is electrically connected to the side and is detachably connected is formed.

  Among these, the microphone body 12 includes a cylindrical main body 13 that is accommodated by providing necessary wiring such as an output unit 18 and a microphone cover that is integrally extended to the front end side of the main body 13. A one-side connecting portion 14 connected to the 22 side is provided.

  In this case, the microphone body 12 is plated with a conductive metal material such as nickel in order to impart electrical conductivity and a rust prevention effect.

  On the other hand, the microphone cover 22 is formed of a mesh-like conductive material and has a substantially U-shaped cross section, and is attached to the open edge 24 side of the cover main body 23 and connected to the one side connecting portion 14 side. The other side connection part 25 is formed.

  In this case, the other side connection portion 25 formed of a conductive alloy such as brass is orthogonal to the length of the cylindrical skirt portion 26 into which the one side connection portion 14 is inserted and the upper edge side of the cylindrical skirt portion 26. An annular protrusion projecting from the peripheral side of the collar part 27 to ensure a space 27 for inserting the flange part 27 extending in the direction and projecting to the outer peripheral side and the open edge 24 side of the cover body part 23 Part 28.

  Moreover, the cover main body 23 and the other side connecting portion 25 are soldered or brazed after inserting the open edge 24 side of the cover main body 23 into the air space 29 secured inside the annular projection 28. Are integrally connected to each other through a joint portion 31 formed as described above.

  In this case, the one-side connecting portion 14 and the other-side connecting portion 25 are configured such that the one-side connecting portion 14 is inserted into the cylindrical skirt portion 26 of the other-side connecting portion 25 so that the end face 26a of the cylindrical skirt portion 26 is one. Each of the screw holes 15 and 30 is provided with screw holes 15 and 30 which are positioned so as to face each other when they come into contact with the protrusions 16 provided on the outer peripheral surface of the side connecting portion 14. It can be detachably connected by screwing 33.

  That is, the microphone body 12 and the microphone cover 22 can be used as the condenser microphone 11 by screwing the set screw 33 to the one side connecting portion 14 and the other side connecting portion 25 so as to be detachably connected. become.

  Next, the operation and effect of the present invention will be described with reference to FIG. 1. The one side connecting portion 14 included in the microphone body is inserted into the cylindrical skirt portion 26 of the other side connecting portion 25.

  At this time, since the one side connecting portion 14 includes the protrusion 16 on the outer peripheral surface thereof with which the end surface 26a of the cylindrical skirt portion 26 abuts, the cylindrical skirt portion 26 of the other side linking portion 25 at the abutting position. The plug-in operation is stopped.

  Moreover, the one-side connecting portion 14 and the other-side connecting portion 25 at this position have screw holes 15 and 30 formed under a positional relationship in which they face each other. By screwing a set screw 33 into the holes 15 and 30, the holes 15 and 30 can be connected together.

  When the one-side connecting portion 14 and the other-side connecting portion 25 are connected in this manner, the microphone body 12 and the microphone cover 22 are reliably electrically connected as a result of close surface contact with each other. In addition, an excellent shielding effect can be imparted as the condenser microphone 11.

  In particular, when the condenser microphone 11 is used as a desktop boundary microphone as shown in FIG. 1, the microphone cover 22 side protrudes from the opening 52 of the installation body D and is exposed, so that the cellular phone can be used at a close distance. Can be used without generating noise due to the excellent shielding effect.

  In addition, in this case, the condenser microphone 11 protrudes from the microphone unit 17 side, accommodates the microphone body 12 side in the installation body D, and is opened through a flange portion 27 provided in the other connection portion 25 of the microphone cover 22. By being hooked on the side of the opening edge 51 that partitions the portion 52, it can be suitably used as a desktop boundary microphone.

  Since the microphone cover 22 can be easily removed from the microphone body 12 side by removing the set screw 33, the microphone unit 17 can be easily inspected and repaired.

  The present invention has been described based on the illustrated example, and the specific configuration is not limited to the illustrated example. For example, the screw holes 15 of the one-side connecting portion 14 and the screw holes 30 of the other-side connecting portion 25 can be formed at a plurality of at least two locations. Moreover, although the cover main-body part 23 and the other side connection part 25 may form the junction part 31 over a perimeter, they can also be formed in a dotted shape in multiple places as desired.

  Furthermore, although the present invention has been described using a desktop boundary microphone as a preferred example, the present invention can also be applied to a type of microphone that is used while being held by a hand microphone, a microphone stand, or the like.

It is explanatory drawing which shows an example of this invention formed as the boundary microphone for desktop, (a) shows a longitudinal cross-section structure, (b) is the state which removed the microphone cover about (a). It is principal part explanatory drawing shown. It is explanatory drawing which shows an example of the conventional boundary microphone for desktop, Among them, (a) shows a longitudinal cross-section, (b) is the principal part shown in the state which removed the microphone cover about (a) It is explanatory drawing.

Explanation of symbols

11 Condenser microphone 12 Microphone body 13 Main body 14 One side connection
DESCRIPTION OF SYMBOLS 15 Screw hole 16 Protrusion 17 Microphone unit 18 Output unit 22 Microphone cover 23 Cover main-body part 24 Open edge 25 Other side connection part 26 Cylindrical skirt part 26a End surface 27 Gutter part 28 Annular protrusion part 29 Airspace 30 Screw hole 31 Joint part 33 Stop Screw 51 Opening edge 52 Opening part D Installation body

Claims (2)

In a condenser microphone comprising at least a microphone body in which a microphone unit is disposed on a front end side, and a microphone cover that covers the microphone unit and is electrically connected to the microphone body so as to be detachably connected.
The microphone body includes a cylindrical main body portion, and a one-side connection portion extending on the distal end side of the main body portion,
The microphone cover includes a net-like cover main body portion that covers the microphone unit side, and an other side connection portion that is attached to the open end side of the cover main body portion and is disposed facing the one side connection portion,
The condenser microphone is characterized in that the one-side connecting portion and the other-side connecting portion are detachably connected by screwing a set screw into a screw hole provided under a positional relationship in which they face each other.   The microphone body is housed in an opening portion of an installation body including a desk partitioned through an opening edge so that the microphone unit side protrudes, and the other side connection portion of the microphone cover is hooked to the opening edge side. The condenser microphone according to claim 1, further comprising a collar portion that can be freely stopped.

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