JP2960220B2 - Microphone for vehicle interior noise detection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone for detecting noise in a vehicle compartment of a vehicle such as an automobile, and more particularly to an arrangement structure of a microphone for noise detection in a vehicle compartment which can be mounted even in a small place in the vehicle compartment.

[0002]

2. Description of the Related Art In recent years, in order to reduce noise caused by rotational vibration of an engine in a vehicle cabin, so-called "muffled sound", an additional sound having a phase opposite to that of the noise is generated from a speaker provided in the vehicle cabin. In addition, a so-called electronic silence system has been proposed in which acoustic interference occurs in a vehicle cabin. In such an electronic silencing system, a plurality of microphones are required to detect noise in the vehicle cabin in order to form an additional sound for acoustically reducing noise.

A conventional microphone has a structure in which a microphone unit is held by an elastic member inside a cylindrical frame, as described in Japanese Utility Model Publication No. 59-9496, for example. These microphones have a structure suitable for, for example, a tape recorder or a cine camera provided with a simultaneous recording mechanism.

[0004]

The above-mentioned prior art microphone structure is suitable for a tape recorder or a cine camera provided with a simultaneous recording mechanism. The structure is not always suitable as a microphone for an electronic noise reduction system for detecting noise. That is,
In the microphone for a cine camera provided with the above-mentioned conventional tape recorder and simultaneous recording mechanism, there is no particular restriction on the strict arrangement space, so that there is no need to worry about the arrangement structure of the microphone unit, and the structure is also in the vehicle interior. It was not suitable for mounting in a small place.

[0005] In particular, in an electronic noise reduction system, a plurality of microphones are mounted in a vehicle cabin, for example, between a roof and a headlining. In this case, in order to reduce the amount of projection into the vehicle cabin, the microphones must be mounted. The structure must be thin. In the above-mentioned conventional microphone, no consideration is given to this point, and there is a problem that a microphone unit cannot be arranged when the microphone is thin.

Accordingly, the present invention provides a structure suitable for a vehicle interior noise detection microphone used in an electronic noise reduction system, and in particular, a thin microphone structure which can be mounted between a roof and a headlining of an automobile. The purpose is to:

Further, since the microphone for detecting noise in the vehicle compartment is mounted on the head lining in the vehicle compartment with a clip for mounting, the microphone unit is damaged by erroneously inserting a rod or the like from the noise intake hole formed. Therefore, another object of the present invention is to
In view of such a case, an object of the present invention is to provide a structure in which a microphone unit can be arranged in a safe and secure manner in a microphone frame.

[0008]

In order to achieve the above-mentioned object, a microphone for detecting noise in a vehicle interior proposed by the present invention has a flat outer shape, as will be apparent from the appended claims. There has been proposed a structure in which a microphone unit is arranged laterally with respect to a noise intake hole formed on an uneven plane of a microphone frame, and an output terminal of the microphone unit is also extracted laterally.

Further, according to the present invention, the microphone unit disposed laterally within the frame of the microphone is further held inside an elastic holder having a groove for taking in noise. It is arranged so as to face the side wall of the groove for use.

[0010]

According to the above-described structure of the microphone for detecting noise in a vehicle interior according to the present invention, the microphone unit is disposed laterally with respect to the noise intake hole formed in the uneven plane of the microphone frame. Further, since the output terminal of the microphone unit is also taken out sideways, the height of the frame can be suppressed and the microphone unit can be arranged in a flat thin frame.

The microphone unit is held inside an elastic holder having a groove for taking in noise. The microphone unit is arranged in the holder so as to face the side wall of the groove for taking in noise. By adopting a structure that is arranged in the hole for receiving, the microphone unit is less likely to be damaged even if a rod or the like is inserted through the hole for taking in noise. Become.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a microphone for detecting noise in a vehicle interior according to an embodiment of the present invention, which is an electronic silencer for reducing noise caused by rotational vibration of an engine in the vehicle interior, and "muffled sound". The system is used as a noise detection device for detecting noise in a vehicle cabin.

Referring to the drawings, as shown in FIG. 1, the microphone for detecting vehicle interior noise has a flat rectangular shape. In other words, the frame 1 constituting the vehicle interior noise detection microphone is assembled by combining the flat upper frame 1-a and the flat lower frame 1-b, and thus has a flat rectangular external shape. I have. A noise taking-in hole 2 for taking in noise is formed protrudingly on an uneven plane of the frame 1, specifically, on a lower surface of the lower frame 1-b. And this frame 1
Inside, a microphone unit 3 (shown by a broken line in the figure), a holder 4 formed of an elastic body such as rubber, for example, and components related to the microphone, for example, a circuit for amplifying an input signal from the microphone are provided. The mounted substrate 5 is accommodated, and a connector 6 for sending out the amplified output from the amplifier circuit substrate 5 to the outside is attached to the rear end of the frame 1.

FIG. 2 shows a cross section of the microphone for detecting the noise in the vehicle interior. As is clear from the drawing, the elastic holder 4 is formed so as to surround the microphone unit 3. . At the center of the holder 4, a prism-shaped noise intake groove 4-a is formed, and the microphone unit 3 is arranged laterally so as to face the wall surface of the noise intake groove 4-a. Have been. That is, as is clear from the figure, the axis of the noise intake hole 2 formed in the frame 1 and the axis of the noise intake groove 4-a of the elastic holder are in the same direction (that is, the axis is the same). The microphone unit 3 is mounted so that its axis is perpendicular to the axis of the noise intake hole 2 or the noise intake groove 4-a. .

In this figure, reference numeral 10 denotes a roof of an automobile, and reference numeral 11 denotes a headlining. Reference numeral 9 denotes a screw for assembling and connecting the upper frame 1-a and the lower frame 1-b, reference numeral 11-a denotes a microphone mounting hole formed in the lining head 11, and reference numeral 12 denotes a mounting hole. 3 shows a clip for use. Specifically, the assembling method is described below. A noise intake hole 2 formed in the microphone mounting hole 11a of the lining head 11 before assembling inside the vehicle body, and projecting from the lower surface of the frame of the vehicle interior noise detection microphone. Is inserted, the mounting clip 12 is mounted from the opposite side of the lining head 11. The lining head 11 in which a plurality of microphones for vehicle interior noise detection are mounted in a predetermined place in this way is mounted in the vehicle interior, and as shown in the drawing, the microphone for vehicle interior noise detection includes the roof 10 and the lining head 11. Will be stored in the gap between them.

Here, a more detailed structure of the elastic holder 4 of the microphone unit 3 will be described with reference to FIG. The elastic holder 4 has a cylindrical main body 4-b (especially,
3 (c)) and left and right overhanging portions 4-c, 4-c for fixing them in the frame 1 (especially, see FIG. 3 (b)). You. And
The above-described noise intake groove 4 is provided in the cylindrical main body 4-b.
-A is formed (particularly, see FIG. 3C),
In the main body 4-b, the microphone unit 3 is arranged laterally with respect to the groove 4-a so as to cover the periphery thereof (particularly, see FIG. 3A). In these holders 4, that is, the noise intake groove 4-a, the main body portion 4-b, and the overhang portion 4-c are integrally formed by a viscoelastic member.

As shown in FIG. 2, the above-mentioned elastic holder 4 is provided in holes 4-d, 4-d of the overhang portion 4-c.
The projections 7, 8 protruding from the inner surface of the upper frame 1-a are inserted, and the viscoelastic member is compressed and securely fixed by combining the upper frame 1-a and the lower frame 1-b. Is done. As described above, the upper frame 1-a
And the lower frame 1-b are fixed by screws 9.
The microphone having the above-described configuration is attached to the mounting clip 12 while a part of the intake hole 2 faces the interior of the vehicle between the roof 10 and the headlining 11 of the automobile. Is the same as

FIGS. 4 to 6 illustrate the operation of the microphone configuration for detecting vehicle interior noise of the present invention in which the microphone unit 3 is arranged horizontally. In FIG. 4A, the microphone unit 3 is disposed laterally with respect to the noise intake hole 2 and the noise intake groove 4-a, and further, on the side of the noise intake groove 4-a. Since it is arranged facing the wall surface, even if a rod or the like is directly inserted from the noise intake hole 2, the microphone unit 3 is unlikely to directly touch the microphone unit 3 as in the conventional structure of FIG. It has become.

In the structure of the present invention shown in FIG. 5A, the space (particularly, the height b of the frame 1) can be considered only by the width a of the microphone unit 3, so that the arrangement of the microphone units can be considered. The structure can be saved in space, and the frame can be made thinner, so that it can be mounted in the vehicle cabin without giving a protruding amount and giving the occupant an uncomfortable feeling. On the other hand, in the conventional structure shown in FIG. 5B, since it is necessary to consider the output terminal of the microphone unit 3, not only the width a of the microphone unit 3 but also the height α of the output terminal Is also required, and the height of the frame 1 becomes b + α, which increases the height.

As is apparent from FIG. 6A, when the microphone unit 3 is arranged in the horizontal direction, no matter how the mounting clip 12 is inserted into the noise intake hole 2, Since the microphone unit 3 does not have to be damaged, the shape of the mounting clip 12 can be simplified as compared with the conventional structure (b), and the mounting of the clip 12 can be improved.

The arrangement structure of the microphone unit of the present invention is arranged laterally with respect to the noise intake hole formed in the frame, and further, is arranged on the side surface.
A viscoelastic member was used as a member for supporting the microphone unit in the frame. With such a horizontal structure of the microphone unit, even if a rod or the like is erroneously inserted from the noise intake hole, the microphone unit is rarely directly touched, and the possibility of breakage is reduced. In addition, by setting the microphone unit in the horizontal direction, the thickness of the frame is determined only by the width of the microphone unit. In particular, unevenness such as dimensional change or variation due to variations in the operation of the output terminal of the microphone unit is reduced. Since it is not provided, a thin flat frame can be reliably achieved. Furthermore, since the microphone unit cannot be seen directly from the noise intake hole, the shape of the fitting portion of the vehicle interior mounting clip can be easily determined, and a shape in which the clip can be easily attached becomes possible.

[0022]

According to the present invention, by arranging the microphone unit sideways and on the side of the noise intake hole, the possibility of breakage due to direct contact with the microphone unit is reduced. Since the arrangement structure can be space-saving and the microphone can be made thinner and flatter, a practically excellent effect that it can be mounted in a small space in a vehicle cabin without a sense of incongruity is exhibited. Furthermore, since the shape of the clip for mounting in the vehicle interior can be simplified, there is a sufficient effect for improving the mounting property.

[Brief description of the drawings]

FIG. 1 is a perspective view of a microphone for detecting noise in a vehicle interior according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the microphone for detecting noise in a vehicle compartment mounted in the vehicle compartment.

FIG. 3 is a front sectional view, a side view, and a plan view of a microphone unit holder of the microphone for detecting vehicle interior noise.

FIG. 4 is a diagram illustrating the operation of the microphone unit and the elastic holder.

FIG. 5 is a diagram illustrating the operation of another microphone unit and an elastic holder.

FIG. 6 is a diagram illustrating the operation of another microphone unit and an elastic holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1-a Upper frame 1-b Lower frame 2 Sound taking-in hole 3 Microphone unit 4 Elastic holder 4-a Noise taking-in groove 4-b Main body 4-c Overhanging part 5 ... Circuit board 6 ... Connector 7, 8 ... projection 9 ... screw 10 ... roof 11 ... head lining 12 ... mounting clip

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuhide Sasaki 2520 Oaza Takaba, Katsuta-shi, Ibaraki Inside the Automotive Equipment Division, Hitachi, Ltd. (72) Inventor Satoshi Hasegawa 2 Nissan Motor Co., Ltd., Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture (58) Field surveyed (Int.Cl. ⁶ , DB name) H04R 1/02 108 B60R 11/02 H04R 1/34 320

Claims (5)

(57) [Claims] 1. A microphone including a microphone unit, a circuit board for amplifying an input signal from the microphone unit, and a connector for transmitting the amplified signal to the outside in a frame. It is formed in a flat shape having a height such that it can be inserted into the interior of the vehicle, especially the gap between the roof and the head lining, and a noise intake hole is formed in the flat surface thereof. A microphone for detecting noise in a vehicle interior, wherein the microphone unit is mounted inside the frame so as to be lateral to an axis of the noise intake hole. 2. The microphone for detecting noise in a vehicle interior according to claim 1, further comprising a holder made of an elastic material for supporting said microphone unit in a frame. 3. The holder is provided with a noise intake groove formed coaxially with the noise intake hole formed in the frame, and further, inside the holder,
3. The microphone according to claim 2, wherein the microphone unit is disposed so as to face a side wall of the noise intake groove. 4. The microphone according to claim 1, wherein an output terminal of the microphone unit is taken out in a direction perpendicular to an axis of the noise intake hole. 5. The vehicle interior noise detection microphone according to claim 1, wherein a mounting clip can be attached to a tip of a noise intake hole formed in the frame.