JP2001268678A - Microphone fixation structure of handsfree interphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a microphone from howling by making it easy to insert the microphone and securely holding and fixing the inserted microphone by pressing it forward. SOLUTION: In this microphone fixation structure of a handsfree interphone, the microphone 1 is inserted into a microphone insertion part 3 formed at a proper place on the internal surface of a base main body 2 and then held and fixed by covering the base main body 2 with a cover body 4. The microphone insertion part 3 has a microphone hole 31 formed toward a side wall 22 of the base main body 2 and a support rib 32 which is elastic enough to hold the bottom part of the microphone 1 is projected from the bottom wall 21 of the base main body 2; and hard rib parts 36 projecting from the bottom wall 21 of the base main body 2 are projected inside the support rib 32 at an interval to form a recessed part 37, in which a hard leg part 41 projected from the cover body 4 is fitted to hold and fix the microphone 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone fixing structure for a hands-free intercom, and more particularly, to inserting a microphone into a microphone insertion portion formed at an appropriate position on an inner surface of a base body, and covering the base body with a cover. And a microphone fixing structure for a hands-free intercom having a structure for holding and fixing the microphone.

[0002]

2. Description of the Related Art Generally, a cover body and a base body, which are outer shells of a hands-free intercom, are formed of resin. Due to the structure of a molding die, a microphone or the like can be screwed to a side surface of the hands-free intercom. Can not.

[0003] Therefore, the microphone is press-fitted into one of the cover body and the base body, and the other is covered and fixed, thereby holding and fixing the microphone.

FIG. 3 is a sectional view of a main part showing a microphone fixing structure of a conventional hands-free intercom.

[0005] This hands-free intercom 100
The microphone 101 covered with the soft rubber cap is inserted into a microphone insertion portion 112 formed at an appropriate position on the inner surface of the base main body 102, and the microphone 101 is held and fixed by covering the base main body 102 with a cover body 103. .

[0006] The microphone 101 is formed by erecting a cylindrical microphone portion 121 on one side of a microphone substrate 111.

[0007] The microphone insertion section 112 is
A microphone hole 132 penetrating toward the side wall 122 of the microphone 101 is formed, and a support rib 142 for holding the microphone substrate 111 of the microphone 101 protrudes from the bottom wall 152 of the base body 102.

The support rib 142 can be formed with either elasticity or rigidity.

A positioning rib 162 for positioning the center of the microphone portion 121 to be inserted is formed in the microphone insertion portion 112 so as to protrude from an appropriate position on the bottom wall 152 of the base body 102.

On the other hand, on the cover body 103, a pressing piece 113 for pressing the inserted microphone 101 is provided upright at a position substantially opposed to the positioning rib 162.

[0011] Such a hands-free intercom 10
In the microphone fixing structure of No. 0, first, the microphone unit 121 is inserted into the microphone insertion unit 112 from the open side of the base body 102 with the microphone unit 121 facing the side wall 122.

Then, the microphone substrate 111 is mounted on the support rib 1.
42 while being substantially in sliding contact with each other, and the center of the microphone portion 121 is
2, and the microphone 101 is temporarily held by the microphone insertion unit 112.

After connecting and assembling the microphone substrate 111 and other control circuits and the like, the cover body 103 is fitted to the base body 102, and the pressing pieces 113 cover the microphone body 101 while pressing the microphone 101. The body 103 fits.

Finally, the bottom wall 15 of the base body 102
2 If the cover 101 is screwed to the cover 103 through screw holes provided at appropriate positions, the microphone 101 is held and fixed.

[0015]

However, in the conventional microphone fixing structure of the hands-free intercom, the microphone 10
Although the holding and fixing in the side direction of the microphone 101 is good,
There was a problem in holding and fixing in the front-back direction.

That is, the support rib 1 of the base body 102
When the elastic member 42 is formed of a soft material having elasticity, the support rib 142 cannot press the inserted microphone 101 toward the microphone portion 121.

Therefore, the microphone 101 is held and fixed in a state where it is easily vibrated in the front-rear direction, and there is a problem that the microphone 101 is liable to howling.

On the other hand, the support rib 142 of the base body 102
When the microphone is molded with rigidity,
2 becomes hard and it is difficult to insert the microphone 101.

If the support rib 142 is erected with a slight gap from the microphone substrate 111 to solve this problem, the microphone 101 after insertion cannot be pressed against the microphone part 121 side. There is a problem that howling easily occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can easily insert a microphone. Further, the inserted microphone can be pressed forward to securely hold and fix the microphone, thereby preventing the howling of the microphone. Provide a microphone fixing structure for a hands-free intercom.

To achieve the above object, a microphone fixing structure for a hands-free intercom according to the first aspect of the present invention is to insert a microphone into a microphone insertion portion formed at an appropriate position on the inner surface of a base body. In a microphone fixing structure of a hands-free intercom in which a base body is covered with a cover body to hold and fix the microphone, the microphone insertion portion has a microphone hole formed toward a side wall of the base body, and the microphone insertion portion is formed. A support rib having elasticity for holding is protruded from the bottom wall of the base main body, and a hard rib portion protruded from the bottom wall of the base main body is further protruded from the bottom wall of the base main body at intervals. A recess is formed, and a hard leg projecting from the cover body is fitted into the recess to hold and fix the microphone.

According to the first aspect of the present invention, a support rib having elasticity is provided on the base body, a recess is formed inside the support rib, and a hard leg that is fitted into the recess is projected from the cover body. I have.

Therefore, when the microphone is inserted into the microphone insertion portion of the base body, the support rib is bent by its elasticity, so that the microphone can be inserted smoothly.

If the cover is put on the base body after the microphone is inserted, the hard leg of the cover fits into the recess of the base and restricts the elasticity of the support rib toward the recess. At the same time, the support rib is pressed toward the microphone.

Therefore, the support ribs of the microphone insertion portion are made hard, and the microphone is pressed forward to securely hold and fix the microphone, thereby preventing the howling of the microphone. According to a second aspect of the present invention, in the microphone fixing structure of the hands-free intercom according to the first aspect, the support rib is provided with a protrusion protruding toward the microphone at least at a portion corresponding to the position of the center of gravity of the microphone.

According to the second aspect, since the projection formed on the support rib is located at the position of the center of gravity of the microphone, the projection presses the position of the center of gravity of the microphone.

Therefore, the microphone is pressed in the forward direction,
The microphone can be more securely held and fixed, and howling of the microphone can be prevented.

According to a third aspect of the present invention, in the microphone fixing structure of the hands-free intercom, in the second aspect, the protrusions are formed at symmetrical positions with respect to the center of gravity of the microphone.

According to the third aspect of the present invention, since the support ribs are formed at symmetrical positions with respect to the center of gravity of the microphone, the microphone can be pressed uniformly in the forward direction, and the holding and fixing of the microphone can be stabilized.

According to a fourth aspect of the present invention, in the microphone fixing structure for a hands-free intercom, the end of the protrusion is formed in a tapered shape gradually narrowing toward the microphone insertion side. are doing.

According to the fourth aspect, the projection of the support rib is formed in a tapered shape that is gradually narrowed toward the microphone insertion side.

Therefore, when the microphone is inserted into the microphone insertion portion, the microphone can be smoothly and easily inserted without being caught by the projection.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A microphone fixing structure of a hands-free intercom according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a microphone fixing structure of a hands-free intercom according to the present invention.

In the drawing, reference numeral 1 denotes a microphone built in the hands-free intercom H. The microphone 1 is inserted into a microphone insertion portion 3 formed at an appropriate position on the lower right corner of the base main body 2, and is inserted into the base main body 2. The microphone 1 is held and fixed by putting a cover body 4 on the microphone 2.

The microphone 1 is formed by erecting a cylindrical microphone section 12 covered with a soft rubber cap on one side of a microphone substrate 11.

The base body 2 is provided around the entire periphery of the bottom wall 21.
2 is erected and formed in a box shape with an open top.

The base body 2 has a built-in control circuit board (not shown) to which a monitor, a speaker, a power supply and the like are connected.

The microphone insertion portion 3 has a microphone hole 31 penetrating toward the side wall 22 of the base body 2.

In this case, a suitable portion of the side wall 22 of the base body 2 is cut out in a semicircular shape, and a disk-shaped microphone protection plate 31a is fixed to the cutout portion, and the microphone hole 31 is formed substantially at the center of the microphone protection plate 31a. Has been established.

The microphone insertion section 3 has a support rib 32 for holding the microphone substrate 11 of the microphone 1 erected upward from the bottom wall 21 of the base body 2.

The support ribs 32 are formed in a thin plate having elasticity, and are formed in the direction of the microphone hole 31 (hereinafter referred to as “forward”).
Call. ) Or in the opposite direction (hereinafter referred to as “rearward direction”).

Therefore, when the microphone 1 is inserted into the microphone insertion section 3, the support rib 32 is bent by its elasticity,
The microphone 1 can be inserted smoothly.

Here, two support ribs 32, 32 symmetrical with respect to the center of gravity P of the microphone 1 located on the extension of the microphone hole 31, are erected, and an opening 3 is formed at the center thereof.
The microphone 1 can be easily connected to the control circuit board through the opening 33.

The support rib 32 has a projection 34 protruding toward the microphone at least at a portion corresponding to the center of gravity P of the microphone.

Here, the projections 34, 34 are formed on the two support ribs 32, 32 symmetrical about the center of gravity position P of the microphone 1, respectively.

As described above, since the protrusion 34 formed on the support rib 32 is located at a position corresponding to the position of the center of gravity P of the microphone 1, the protrusion 34 presses the position of the center of gravity of the microphone 1 and Can be pressed forward.

Further, as shown in the present embodiment, if the projections 34, 34 are formed on the two support ribs 32, 32, a uniform pressing force on the left and right with respect to the center of gravity P of the microphone 1 can be obtained. 1 and the microphone 1 can be stably pressed forward.

Further, in this embodiment, the projections 34, 34
Is formed in a tapered shape gradually narrowing upward.

Therefore, when the microphone 1 is inserted into the microphone insertion section 3, the microphone 1 can be smoothly and easily inserted without being caught by the projections 34, 34.

The microphone insertion section 3 has positioning ribs 35 for positioning the center of the microphone section 12 to be inserted.
From the bottom wall 22 of the base body 2.

Inside the support rib 32 formed as described above (on the side opposite to the microphone side), a hard rib portion 36 projecting from the bottom wall 22 of the base body 2 with a gap is further upwardly directed. It protrudes and forms a recess 37.

The rib portion 36 is formed so as to be gradually thicker toward the bottom wall 22 and is formed so as not to bend in the front-rear direction.

Here, two ribs 36, 36 symmetrical with respect to the center of gravity P of the microphone 1 are erected, and an opening 38 is formed at the center thereof.
Through this, the microphone 1 can be easily connected to the control circuit board.

On the other hand, a hard leg 41 that fits into the recess 37 projects downward from the cover body 4.

The leg 41 is provided in the recess 37 of the base body 2.
The rigidity of the support ribs 32, 32 joined to the front of the leg 41 can be reliably restricted in the rearward direction.

The cover body 4 has positioning ribs 35.
A push piece 42 for pressing the inserted microphone 1 from the side is provided upright at a position substantially opposed to.

FIG. 2 is a sectional view of a main part showing a fixing structure of the hands-free intercom according to the present invention.

The microphone fixing structure of the hands-free intercom H configured as described above is assembled in the following manner.

First, the microphone 1 is inserted into the microphone insertion section 3 from the open side of the base body 2 with the microphone section 12 facing the side wall 22 of the base body 2.

Then, the microphone substrate 11 is supported by the support ribs 32.
Abut on the protruding portion 34.

When this is further pushed in, the support rib 32 having elasticity bends backward and spreads out, and the microphone substrate 1
1 can be smoothly inserted while being in sliding contact with the projection 34.

Eventually, further insertion of the side wall of the microphone portion 12 is restricted by the positioning rib 35 of the base body 2, and the center of gravity P of the microphone portion 12 is positioned so as to overlap the center of the microphone hole 31. .

At this time, the projection 34 of the support rib 32
It is positioned at a position corresponding to the center of gravity position P of the microphone 1,
In addition, since the support rib 32 that has been expanded elastically urges forward, the microphone 1 is pressed forward, and the microphone 1 is temporarily temporarily held by the microphone insertion unit 3.

Next, an opening 33 between the support ribs 32, 32 is formed.
After connecting the microphone board 11 and the control circuit board through other means, and connecting and assembling other parts, the cover body 4 is fitted to the base body 2.

Then, the hard leg portions 41 protruding from the cover body 4 are connected to the support ribs 32 and the rib portions 36 of the base body 2.
And slides into the recess 37.

By fitting the hard leg 41 into the recess 37, the elasticity of the support rib 32 in the rear direction is restricted, and the support rib 32 is pressed forward by the leg 41.

As a result of this pressing, the microphone 1 temporarily held in front of the support rib 32 is further pressed forward, and the pressing piece 42 of the cover 4 presses the side of the microphone 1. The cover body 4 is fitted to the base body 2.

Lastly, if the cover body 4 is screwed through a screw hole provided at an appropriate position on the bottom wall 21 of the base body 2,
The microphone 1 can be securely held and fixed in a state where it is pressed in any of the front, rear, left and right directions, and howling of the microphone 1 can be prevented.

[0068]

According to the present invention, the following effects can be obtained.

According to the microphone fixing structure of the hands-free intercom according to the first aspect, when the microphone is inserted into the microphone insertion portion of the base body, the support rib is bent by its elasticity, and the microphone can be inserted smoothly.

In addition, if the cover is put on the base body after the microphone is inserted, the hard legs of the cover fit into the recesses of the base body and regulate the elasticity of the support ribs toward the recesses. At the same time, since the support ribs are pressed toward the microphone, the support ribs are hardened, and the microphones are pressed forward to securely hold and fix the microphones, thereby preventing howling of the microphones.

According to the microphone fixing structure of the hands-free intercom according to the second aspect, the projection formed on the support rib is located at a portion corresponding to the position of the center of gravity of the microphone. It can be pressed reliably.

Further, since the projection is provided on the microphone side, the microphone can be pressed in the forward direction, and the microphone can be held and fixed more reliably to prevent howling of the microphone.

According to the microphone fixing structure of the hands-free intercom according to the third aspect, since the support ribs are formed at symmetrical positions with respect to the center of gravity of the microphone, the microphone is pressed uniformly in the forward direction. The microphone can be held and fixed stably.

According to the microphone fixing structure of the hands-free intercom according to the fourth aspect, the projection of the support rib is formed in a tapered shape gradually narrowing toward the microphone insertion side. When the microphone is inserted, the microphone can be more smoothly and easily inserted without being caught by the protrusion.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a microphone fixing structure of a hands-free intercom according to the present invention.

FIG. 2 is a sectional view of a main part showing a fixing structure of the hands-free intercom according to the present invention.

FIG. 3 is a sectional view of a main part showing a microphone fixing structure of a conventional hands-free intercom.

[Explanation of symbols]

 H Hands-free intercom P Microphone center of gravity position 1 Microphone 2 Base body 21 Bottom wall 22 Side wall 3 Microphone insertion part 31 Microphone hole 32 Support rib 34 Protrusion part 36 Rib part 37 Recess 4 Cover body 41 Leg part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 7/12 H05K 7/12 A F term (Reference) 4E353 AA10 AA18 BB02 CC01 CC04 CC16 CC36 DD05 DD08 DD11 DR13 DR17 DR25 DR34 DR46 DR53 GG09 GG13 GG16 GG21 GG33 5D017 BC03 BC12 5K023 AA05 BB10 CC06 EE13 MM22 PP02 5K027 AA09 BB03 DD07 HH03 5K038 AA07 FF13

Claims (4)

[Claims] 1. A microphone fixing structure for a hands-free intercom in which a microphone is inserted into a microphone insertion portion formed at an appropriate position on an inner surface of a base body, and the base body is covered with a cover to hold and fix the microphone. The microphone insertion portion has a microphone hole formed toward a side wall of the base main body, and has a support rib having elasticity for holding the microphone protruding from a bottom wall of the base main body, and is provided inside the support rib. The hard ribs protruding from the bottom wall of the base body are further protruded at intervals to form a recess,
A microphone fixing structure of a hands-free intercom, wherein a hard leg protruding from the cover body is fitted into the recess to hold and fix the microphone. 2. The microphone fixing structure of a hands-free intercom according to claim 1, wherein the support rib has a protrusion protruding toward the microphone at least in a portion corresponding to the position of the center of gravity of the microphone. 3. The microphone fixing structure of the hands-free intercom according to claim 2, wherein the protrusions are formed at positions symmetrical with respect to the center of gravity of the microphone. 4. A microphone fixing structure for a hands-free intercom according to claim 2, wherein an end of said projection is formed in a tapered shape gradually narrowing toward a microphone insertion side.