KR100565462B1 - Holder Kit for directional condenser microphone - Google Patents

Abstract

The present invention relates to a holder kit for a directional microphone that can improve the directivity. The holder kit of the present invention is a cylindrical shape having a space for inserting a condenser microphone therein, one side of which is opened to insert the condenser microphone, and the other side of the holder kit supports the inserted condenser microphone and transmits the front sound. A housing having a sound hole formed therein, a side of which a sound path for transmitting rear sound is formed, and a through groove formed to allow a connection member for connecting the condenser microphone to the external main PCB; A connection member for connecting the microphone inserted into the housing with an external circuit; A holder cap of a rubber material having one surface open and a cylindrical shape with the other surface closed to protect the holder, and having a hole for passing through the connection member; And a wind screen made of a conductive nonwoven fabric capable of preventing bursting sound and improving EMI characteristics. Therefore, the present invention is to remove the noise caused by the vibration using the holder cap of the rubber material, to provide an acoustic chamber for the rear sound introduced through the acoustic passage of the housing to improve the directivity characteristics, to remove the wind noise The electromagnetic shielding function can be improved.

Directional Microphone, Sound Hole, Sound Path, Bidirectional, Holder, Housing

Description

Holder Kit for directional condenser microphone             

1 is an exploded perspective view showing a holder kit for a directional microphone according to the present invention,

FIG. 2 shows a holder for the directional microphone shown in FIG. 1, FIG.

3a, 3b show the cap of the holder shown in FIG. 1, FIG.

Figure 4a, 4b is a state of use of the holder kit for a directional microphone according to the present invention,

5 is an assembly cross-sectional view of a holder kit according to the present invention;

Figure 6a, 6b is a schematic diagram showing a test environment for confirming the effect of the present invention,

7a, 7b is a graph showing the frequency characteristics of the microphone before / after using the holder kit of the present invention,

8A and 8B are graphs showing the phase characteristics of the microphone before and after using the holder kit of the present invention.

* Explanation of symbols for main parts of the drawings

10: windscreen 20: housing

30: microphone 40: FPC

50: holder cap 55: rear chamber

The present invention relates to a holder kit for mounting a condenser microphone, and more particularly to a holder kit for a directional condenser microphone that can improve the directivity characteristics.

In general, microphones are classified into omnidirectional (directional) microphones and directional microphones according to directivity characteristics. Directional microphones are classified into bi-directional microphones and uni-directional microphones. The bidirectional microphone faithfully reproduces the front and rear incident sounds and exhibits attenuation characteristics for sound incident from the lateral angle so that the polar pattern of the sound source is 8-shaped and the near field characteristic is good. Widely used for noisy stadium announcers. The unidirectional microphone maintains the output value in response to a wide front incident sound, and the back incident sound source cancels the output value to improve the S / N ratio of the front sound source, and it is widely used in speech recognition equipment because of its clearness.

Such directional microphones generally form sound holes in the case and the PCB surface, and thus have directivity using the phase difference between the front sound and the rear sound. However, when the directional microphone is mounted on a main PCB such as a mobile phone, the microphone is mounted by forming a space for the microphone in a mobile phone case having a complicated mechanical shape and connected to the main PCB by a jumper wire or an FPC. That is, in the case of a mobile phone case, the mechanical shape is very complicated to mount various types of components at high density, and the internal space formed around the microphone is irregular.

Therefore, conventionally, when the directional microphone is mounted on a mobile phone, a space for mounting the cell phone case mechanism must be configured. Furthermore, an irregular acoustic field is formed by a complicated mechanism inside the case, so that accurate orientation is achieved. There was a problem that was difficult to obtain effect.

The present invention has been proposed to solve the above problems, the holder kit for the directional condenser microphone that can maintain a good static characteristic even after mounting the directional microphone is formed by the passage for the rear sound and side sound is formed The purpose is to provide.

In order to achieve the above object, the holder kit of the present invention is a cylindrical shape having a space for inserting a condenser microphone therein, one side of which is opened to insert the condenser microphone, and the other side supports the inserted condenser microphone. In addition, there is a support portion formed with an acoustic hole for transmitting the front sound, and an acoustic path for transmitting the rear sound is formed at the side, and a through hole for passing a connection member for connecting the condenser microphone with the external main PCB. Formed housing; A connection member for connecting the microphone inserted into the housing with an external circuit; A holder cap of a rubber material having one surface open and a cylindrical shape with the other surface closed to protect the holder, and having a hole for passing through the connection member; And a wind screen made of a conductive nonwoven fabric capable of preventing bursting sound and improving EMI characteristics.

In addition, the holder cap is a chamber space for the rear sound introduced through the acoustic path of the housing is formed, the connection member is an FPC area of the negative polarity larger than the positive polarity area for the noise shielding of the rear inlet sound.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view showing a holder kit for a directional condenser microphone according to the present invention.

Referring to Figure 1, the holder kit of the present invention is a wind screen (10) to block the wind noise (rupture sound) flowing into the microphone, the housing 20 for inserting the microphone 30, the housing 20 It includes an FPC (Flexible Printed Circuit) 40 for connecting the inserted microphone 30 to an external circuit, and a microphone 30 inserted in the housing 20 to surround the entire holder to block external rear reflections and It is configured to secure the chamber of the rear sound through the holder cap 50 for improving the vibration noise to improve the directivity of the microphone 30 inserted into the housing 20.

In this case, the wind screen 10 is made of conductive material by adding a conductive material to a nonwoven fabric such as polyester to block conductivity of the low frequency band and to block electromagnetic noise (EMI) noise from the outside. In addition, the FPC 40 is configured such that the area of the negative polarity is larger than that of the positive polarity for noise shielding of the rearward inflow sound.

2A and 2B show the housing for the directional microphone shown in FIG.

2A and 2B, the housing 20 has a support 208 for supporting the condenser microphone 30 having one side open to insert the condenser microphone 30 and the other side inserted therein, and the condenser therein. The cylindrical chamber 30 is formed with a space for inserting the microphone 30. And the support portion 208 of the housing has a large hole 210 for transmitting the front sound to the condenser microphone 30, the side 202 of the housing has four acoustic paths for delivering the rear sound when mounted ( 204-1 to 204-4, and projections 212 are formed on the opening to prevent separation of the condenser microphone 30, and a part of the side surface of the condenser microphone 30 is connected to an external main PCB. The through grooves 206 are formed to allow the FPC 40 to be electrically connected to pass therethrough. Resin, plastic, rubber, a metal, etc. can be used as a material of such a holder housing. In the exemplary embodiment of the present invention, the cylindrical housing is illustrated in order to mount the cylindrical condenser microphone, but other cylindrical shapes are possible according to the shape of the microphone.

FIG. 3A is a perspective view showing the cap of the holder shown in FIG. 1, and FIG. 3B is a sectional view of the holder cap shown in FIG. 1.

3A and 3B, the holder cap 50 of the present invention has a cylindrical shape in which the bottom surface 51 is blocked and the other surface is opened so that the FPC 40 can pass through the side surface 52 near the bottom surface. Slot-like through holes 53 are formed. In addition, the interior of the cap is formed with a space 54 for inserting the housing 20, and a free space 55 is formed to act as a rear acoustic chamber with a cushioning function, the housing 20 is easily removed Protruding frame 56 is formed on the opening surface to prevent that. The holder cap 50 is made of the same rubber material of silicon to block the external rear reflection sound, to secure the chamber of the rear sound through the front, and provides a function to improve the vibration noise. In addition, the holder cap 50 may be made of any one of materials such as plastic, resin, and metal, in addition to rubber.

Figures 4a and 4b is a state of use of the holder kit for a directional microphone according to the present invention, Figure 5 is a cross-sectional view of the A-A plane in the state of use of Figure 4b.

4A, 4B, and 5, the windscreen 10 is placed in the housing 20 and the microphone 30 is inserted into the through groove 206 and the holder cap 50 formed in the housing 20. The holder cap 50 is placed on the housing 20 so that the positions of the formed through holes 53 coincide with each other, and a flexible printed circuit (FPC) 40 is inserted into the housing through the through holes 53 of the cap 50. The connection terminal of the flexible printed circuit (FPC) 40 is connected to the connection terminal of the inserted microphone 30. Thus, when using the holder cap 50 according to the present invention is provided in the housing 20 by providing a chamber space 55 for the rear sound while protecting the microphone 30 inside the housing 20 from vibration. The rear sound may be introduced into the chamber space 55 through the acoustic paths 204-1 to 204-4 to improve the directivity.

6A and 6B are examples of test environments for comparing directional microphone characteristics with and without the holder kit according to the present invention.

6A is a case in which the holder kit according to the present invention is not applied, the front incident sound is introduced into the sound hole formed in the case of the microphone, and the rear incident sound is formed into the sound hole formed in the PCB of the microphone through the instrument in the environment where the microphone is installed. It can be seen that the reflected sound of the various paths is incident together with the rear sound by the inflow and especially by a complicated instrument.

6b is a case in which the holder kit according to the present invention is applied, the front incident sound is introduced into the microphone, and the rear incident sound is introduced through the acoustic path formed in the holder kit of the present invention, and thus, a complicated structure of the environment in which the microphone is installed. It can be seen that it is not affected at all.

7A and 7B are graphs showing the frequency characteristics of the microphone measured in the environment as shown in FIGS. 6A and 6B. FIG. 7A shows the characteristics of the microphone when the holder kit of the present invention is not used. Shows the characteristics in the case of using the holder kit of the present invention.

7A and 7B, the horizontal axis represents frequency (unit Hz), the vertical axis represents sensitivity (unit dB), and the graph above shows the frequency characteristics for the front sound source (0 °) and the graph below. Denotes the frequency characteristic for the rear sound source 180 °.

Comparing the characteristics of the graph shown schematically, the front sensitivity is the same as before and after using the holder kit of the present invention, but the rear sensitivity is much lower after using the holder kit over the entire frequency band, indicating that the directivity toward the front is improved. Can be.

8A and 8B are polar pattern diagrams of microphones measured in an environment similar to those of FIGS. 6A and 6B. 8A shows characteristics when the holder kit of the present invention is not used, and 8B shows a case where the holder kit is used. The characteristics are shown. 8A and 8B, the angle of a circle represents the direction centering on the microphone to be measured, and 0 ° represents the front and 180 ° represents the rear. And the distance from the center represents the sensitivity (amplitude; unit dB) in the corresponding direction.

Comparing the polar pattern diagrams shown in FIGS. 8A and 8B, the sensitivity of the front sound source is almost similar to before and after using the holder kit of the present invention, but the sensitivity of the rear sound source is lower after the holder kit is used. It has been strengthened, and it can be seen that the directivity characteristics such as the irregular directivity pattern appearing before the holder kit use evenly appear as a forward-facing static directivity pattern after the use of the holder kit are greatly improved.

As can be seen from the above experimental results, even if only the directional microphone is applied to make a hole in the rear of the instrument, a change in the time delay rate appears due to the change in the incidence path of the rear sound, especially the reflection sound in the instrument. It can be seen that the frequency characteristic is distorted due to the change in frequency resonance, reinforcement and interference due to the influence. However, when using the holder kit according to the present invention, it can be seen that the directivity is improved by eliminating external interference to the incident sound in front and rear of the directional microphone.

As described above, when the holder kit for the directional condenser microphone of the present invention is used, the incoming sound waves can be introduced in front, side, and rear of the condenser microphone so that they are always the same sound field even when installed in a fixture larger than the size of the holder housing. Because of this, the directivity of the static characteristics can be provided. In addition, the use of a rubber holder cap removes the noise caused by vibration, and provides an acoustic chamber for the rear sound introduced through the acoustic path of the housing to improve the directivity and wind noise by the wind screen. And improve the electromagnetic shielding function.

Claims (6)

delete A cylindrical shape having a space for inserting a condenser microphone therein, one side of which is open to allow the condenser microphone to be inserted, and the other side of which supports the inserted condenser microphone, and a support having an acoustic hole for transmitting the front sound. A side surface having an acoustic path for transmitting rear sound and having a through groove formed therein so as to allow a connection member for connecting the condenser microphone to the external main PCB; A connection member for connecting the microphone inserted into the housing with an external circuit; A holder cap of a rubber material having one surface open and a cylindrical shape with the other surface closed to protect the holder, and having a hole for passing through the connection member; And A holder kit for a directional condenser microphone, characterized in that it has a wind screen made of a conductive nonwoven fabric and is attached to an acoustic hole portion of the housing to prevent rupture sound and improve EMI characteristics. The method of claim 2, wherein the wind screen A holder kit for a directional condenser microphone, wherein a conductive material is added to polyester. The method of claim 2, wherein the holder cap Holder kit for a directional condenser microphone, characterized in that the chamber space for the rear sound introduced through the acoustic path of the housing is formed. The method of claim 2, wherein the holder cap Holder kit for a directional condenser microphone, characterized in that any one of a material such as rubber, plastic, resin, metal. The method of claim 2, wherein the connecting member Holder kit for directional condenser microphones, characterized in that the area of the negative polarity is FPC wider than the area of the positive polarity for shielding noise of the rear inlet sound.

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