JPS5825666Y2 - Microphone vibration isolation mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration isolation mechanism for a microphone suitable for use in, for example, a tape recorder or a cine camera equipped with a simultaneous recording mechanism.

Recently, cine cameras equipped with a so-called simultaneous recording mechanism that can record audio at the same time as taking pictures have become popular.

Such a cine camera is constructed such that a microphone is attached to the tip of a rod-shaped support extending from the camera body, and audio can be recorded using the microphone in synchronization with the operation of the cine camera.

By the way, simply attaching the microphone to the tip of the rod-shaped support extending from the camera body as described above will not work.
There is a problem in that when the cine camera is operated, mechanical vibrations caused by rotation of a motor built into the cine camera body are transmitted to the microphone via the rod-shaped support, deteriorating the S/N ratio.

Further, this problem is not limited to cine cameras, but also applies to tape recorders, etc., where mechanical vibrations of the motor have an adverse effect on the built-in microphone.

For this reason, various measures to eliminate vibrations have been developed, such as wrapping the microphone with an elastic shock absorbing member, but none of them have been able to achieve sufficient effects.

Therefore, we have developed a vibration isolation mechanism that has sufficient vibration isolation effect to eliminate the negative effects of vibration on the microphone, can support the microphone stably and reliably, and can fully meet the needs of the user. is strongly requested.

This invention was made based on the above circumstances, and the purpose is to provide an extremely good microphone vibration isolation mechanism that can obtain a sufficient vibration isolation effect and support the microphone stably and reliably. do.

Hereinafter, a basic example in which this invention is applied to a cine camera equipped with a simultaneous recording mechanism will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a microphone section, which is attached to a cine camera body (not shown) via a rod antenna-shaped support 12.

As shown in FIG. 2, this microphone unit U is constructed by covering a cylindrical microphone assembly 13 with a first mesh 14 formed in a cylindrical shape using a fine mesh member, and then placing a substantially dome-shaped head case assembly on top of the first mesh 14. 15, and the opening 16 of the head case assembly is closed with a head base 17.

Then, by fitting the mounting part 19 of the supporter 12 into the recess 18 formed on the back surface of the Herad case 17 and tightening it with the screw 20, the microphone part 11 and the supporter 12 are connected to each other.
is attached.

In addition, the connection wire 21.2 of the microphone assembly 13
2 is inserted through a not-illustrated through hole penetrating the head base 17 and connected to a connection electrode 22 formed on the mounting portion 19 of the support 12 .

This connection electrode 22 is connected to a microphone input terminal of a recording circuit of the cine camera body via a connection wire (not shown) that passes through the support 12.

Here, FIG. 3 shows the details of the head case assembly j15, and inside the head case 23, which has a cylindrical shape and has a plurality of large notches (in the illustrated case, three places) on its side surface, Second to fourth meshes 24 to 26, which are formed into cylindrical shapes of different sizes and are made of mesh members having different mesh coarseness, are stored in an overlapping manner.

Fifth to seventh meshes 27 to 29, which are formed into hemispherical shapes of different sizes and are made of mesh members having different mesh coarseness, are attached to one end of the head case 23 in an overlapping manner. It is something.

FIG. 4 shows details of the microphone assembly, in which a microphone unit 31 is loosely inserted into a cylindrical frame 30 and suspended within the frame 30 by an elastic member 32 made of, for example, rubber.

This frame 30, as shown in Fig. 5 a, l), c,
It has a large number of through holes 33 on the side surface, and locking portions 34 and 35 are formed at both ends thereof at approximately 90° intervals.

The locking portions 34, 35 are formed by connecting a large-diameter through-hole portion 36.37 and a small-diameter through-hole portion 38, 39, respectively.

Here, as shown in FIG. 6, the microphone unit wings include a microphone body 40,
0, a first unit cap 44 that covers the microphone main body 40 from the front sound collecting section 43 side, and a second unit that covers the weight 42 from the rear side. It consists of a cap 45.

The weight 42 is made of a metal material, and has a cylindrical shape with a through hole 46 formed in its center, as shown in FIGS. 7a and 7l).

Attachment portions 41 are provided at one end of the weight 42 at approximately 90° intervals.

The mounting portion 41 has a crank-shaped step on its side, and is formed with a first mounting portion 47 and a second mounting portion 48 .

The weight 42 and the microphone main body 40 are attached by fitting the rear circumferential side of the microphone main body 40 between the first mounting portions 47 .

At this time, the connection wires 21 , 21 extending from the rear of the microphone body 40 are inserted through the through holes 46 of the weight 42 and led out to the rear surface of the weight 42 .

Note that FIG. 7A is a cross-sectional view of the portion indicated by the dashed line in FIG. 7A.

In addition, the first unit cap 44 is shown in FIGS.
), c, a substantially cylindrical hanging portion 50 having a diameter smaller than that of the cap 49 is formed at one end of the substantially cylindrical cap portion 49, and has a substantially convex side surface.

A pair of collar portions 5 are provided at an appropriate interval at the tip of the hanging portion 50.
1.51 is formed, and four parts 52 are constructed.

Then, the side surface of the microphone body 40 and the weight 4
By inserting the opening of the cap part 49 between the second mounting part 48 of the microphone body 40 and the first
A unit cap 44 is attached to the unit cap 44.

Note that FIG. 8C is a cross-sectional view of the portion indicated by the dashed line in FIG. 8A.

On the other hand, the second unit cap 45 has a similar configuration to the first unit cap 44 and is attached to the rear part of the weight 42.

Next, the means for suspending the microphone unit 31 configured as described above within the frame 30 via the elastic member 32 will be explained.

That is, the elastic member 32 is formed into a cross shape as shown in FIG. 9, and a through hole 53 is formed in the center thereof.

Furthermore, a collar-shaped stopper 54 is formed at each tip.

Then, as shown in FIGS. 10 and 11, the recess 52 formed in the hanging portion 50 of the first unit cap 44 is fitted into the through hole 53 of the elastic member 32.

Next, the microphone unit 31 is loosely inserted into the frame 30, and the stopper 54 of the elastic member 32 is inserted into the frame 30.
from the inside of the frame 30 through the large-diameter through-hole 36, and slide the stopper 54 toward the small-diameter through-hole 38.

Therefore, a stopper 54 is attached to the locking portion 34 of the frame 30.
is locked, and as a result, the first unit cap 44 is suspended approximately at the center of the frame 30 via the elastic member 32, as shown in FIG.

Further, the second unit cap 45 is also attached to the frame 30.
The microphone unit 31 is suspended by an elastic member 32 in substantially the same manner as in FIGS. 10 and 11, and the microphone unit 31 is
It is suspended within a frame 30 as shown in the figure.

According to the microphone vibration isolation mechanism according to the basic example configured as described above, mechanical vibrations caused by rotation of the motor of the cine camera body, etc. are absorbed by the elastic member 32 and transmitted to the microphone unit 31. can be prevented,
It is possible to eliminate problems such as deterioration of the S/N ratio as in the prior art.

The microphone unit 31 is pulled from four directions (a total of eight directions at both ends), and the elastic member 32 is connected to the hanging portions of the first and second unit caps 44 and 45 and the locking portions 34 of the frame 30. Since it is securely attached to 35,
The microphone unit 31 can be supported stably and reliably.

Further, in the basic example described above, the microphone unit 31 is hung in four directions, but it may be hung in three directions as appropriate.

By the way, in the microphone vibration isolation mechanism according to the basic example configured as described above, the microphone unit 31 is suspended within the cylindrical frame 30 by a plurality of elastic members 32, such as rubber, installed in the radial direction from both ends thereof. However, since the length of each elastic member 32 is insufficient, sufficient damping of vibrations transmitted from the outside cannot be achieved.

In particular, the smaller the microphone is, the shorter the installation length of the elastic member 32 is, so vibrations transmitted to the frame 30 tend to be transmitted to the microphone unit 31 without being sufficiently attenuated. Ta.

Therefore, this invention was made with this point in mind in particular, and by installing a plurality of elastic members in a staggered manner between both ends of the microphone unit and both ends of the frame, the installation length of each elastic member can be increased. It is characterized in that it can be made to have a long length, thereby effectively damping vibrations transmitted from the outside.

Next, an embodiment of this invention based on the above outline will be described in detail with reference to FIG. 12.

However, in this case, the configuration according to the basic example shown in FIGS. 1 to 11 described above, excluding the microphone unit suspension support part shown in FIGS. 4 to 11, is also included in the basic example in this invention. Since the configuration is similar to that of , the explanation thereof will be omitted.

That is, in FIGS. 12a and 12, 30' has many through holes on the side and locking parts (
However, in this case, the frame is formed into a cylindrical shape with an interval of 180 degrees.

Further, 31' is a microphone unit configured in the same manner as the basic example described above (with the exception of the cap portion).

The microphone unit 31' is loosely inserted into the cylindrical frame 30', and integrally with caps 44' and 45' made of, for example, rubber, attached to both ends thereof, the microphone unit 31' is staggered without crossing each other. It is suspended and supported within the frame 30 via a plurality of protruding whisker-like elastic members 32'.

Here, the plurality of whisker-like elastic members 32' are connected to the frame 30'.
The cylindrical frame 30 has a stopper 54' at a protruding tip portion that is staggered in the front and back direction with respect to both ends of the cylindrical frame 30.
The microphone unit 31' is inserted and locked into the locking parts provided at both ends of the cylindrical frame 30', so that the microphone unit 31' is coaxially suspended in the center of the cylindrical frame 30'. It is being constructed.

According to such a configuration, since the microphone unit 31' is supported by the frame 30' via the plurality of elastic members 32' installed alternately at both ends thereof, each of the elastic members 32' The installation length of the frame 30' is as long as possible, and external vibrations transmitted to the frame 30' side are sufficiently attenuated and are not transmitted to the microphone unit 31' side, and the whole structure is supported stably and reliably. Moreover, it becomes possible to exhibit a sufficient vibration-proofing effect.

FIGS. 13a, l) show another embodiment in which a plurality of whisker-like elastic members 32' are made to protrude from each other in directions symmetrical to those in FIGS. 12a, l).

In this case as well, a sufficient vibration-proofing effect can be exerted as in the case above.

Furthermore, the whisker-like elastic members 32' having different lengths do not necessarily have to be integrated with the caps 44' and 45'.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as detailed above, according to this invention, it is possible to provide an extremely good microphone vibration isolation mechanism that can obtain a sufficient vibration isolation effect and support the microphone stably and reliably. .

[Brief explanation of the drawing]

Figure 1 is an external view showing the microphone section of a cine camera with a simultaneous recording mechanism to which the basic example of this invention is applied;
3 is an exploded view showing the structure of the head case assembly of the microphone section, FIG. 4 is a side sectional view showing the structure of the microphone assembly of the microphone section, and FIG. Figures a, l), c
6 is an exploded view showing the configuration of the microphone unit of the microphone assembly, and FIG. A front view and a partially sectional side view showing the shape of the weight, and FIGS. 9 to 11 are perspective views showing the shape of the elastic member, and sectional views and front views showing the state in which it is attached. FIGS. FIGS. 13a and 13b are a side sectional view and a front view showing one embodiment of the shaking mechanism, and FIGS. 13a and 13b are a sectional view and a front view showing another embodiment. 11...Microphone section, 12...Support, 13...Microphone assembly, 1
4...First mesh, 15...Head case assembly, 16...Opening, 17
...Head base, 18...Concavity, 1
9...Mounting part, 20...Screw, 21,
21... Connection wire, 22... Connection electrode,
23...Head case, 24 to 26...
...Second to fourth meshes, 27 to 29...
- Fifth to seventh meshes, 30... frame, 31... microphone unit, 32...
...Elastic member, 33...Through hole, 34.35.
...Locking part, 36.37...Through hole part, 3
8.39...Through hole part, 40...Microphone body, 41...Mounting part, 42...
・Weight, 43... Sound collection section, 44...
・First unit cap, 45...Second unit cap, 46...Through hole, 47...
...First mounting part, 48...Second mounting part, 4
9... Cap part, 50... Hanging part,
51.51... collar part, 52... recessed part,
53...Through hole, 54...Stopper,
30'...Frame, 31'...Microphone unit, 32'...Elastic member.

Claims (1)

[Scope of utility model registration request] A cylindrical frame, a microphone unit loosely inserted into the frame, and an end portion of the microphone unit and the frame are constructed such that they are staggered in the front and rear direction without intersecting each other, and the microphone units are inserted into the frame. A vibration isolation mechanism for a microphone, comprising a plurality of hanging elastic members.