JPS6143355Y2 - - 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, a cine camera, a video camera, etc. equipped with a simultaneous recording mechanism. 2. Description of the Related Art Recently, cine cameras, video cameras, etc. equipped with a so-called simultaneous recording mechanism that can record audio at the same time as photographing have become popular. Such cine cameras, video cameras, etc. are configured 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 camera. It is something. By the way, if the microphone is simply attached to the tip of the rod-shaped support extending from the camera body as described above, mechanical vibrations caused by the rotation of the motor built into the cine camera body will damage the rod-shaped support when the camera is operated. transmitted to the microphone via
There was a problem that the S/N ratio deteriorated. Also, this problem is not limited to cine cameras and video cameras, but also applies to tape recorders, etc.
The mechanical vibration of the motor had an adverse effect on the built-in microphone. For this reason, various measures to eliminate vibrations have been developed, such as wrapping the microphone in 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 or video camera equipped with a simultaneous recording mechanism will be explained in detail with reference to the drawings. 1st
In the figure, reference numeral 11 denotes a microphone section, which is attached to a cine camera body (not shown) via a rod antenna-shaped support 12. This microphone part
11 , as shown in FIG. 2, covers a cylindrical microphone assembly 13 with a first mesh 14 formed in a cylindrical shape using a fine mesh member;
On top of that is a roughly dome-shaped head case assembly.
15 and the head case assembly 15.
The opening 16 of the head is closed with a head base 17. The mounting portion 1 of the support 12 is placed in the recess 18 formed on the back surface of the head case 17.
By fitting 9 and tightening with screw 20,
Microphone section 11 and supporter 12 are attached. In addition, the connection wires 21 and 21 of the microphone assembly 13 are inserted through a through hole (not shown) that passes through the head base 17, and are inserted into the mounting portion 1 of the support 12.
It is connected to a connection electrode 22 formed at 9. This connection electrode 22 is connected to a microphone input terminal of a recording circuit of the 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 15. In the head case 23, which has a cylindrical shape and has a plurality of large notches (in the case of the figure, three places) on its side surface, there are two parts that have rough openings. The meshes 2 in FIGS. 2 to 4 are formed into cylindrical shapes of different sizes using mesh members of different sizes.
4 to 26 are stored one on top of the other. Fifth to seventh meshes 27 to 29, which are formed into hemispherical shapes of different sizes and are made of net-like members having different mesh coarseness, are attached to one end of the head case 23 in an overlapping manner. It is. FIG. 4 shows details of the microphone assembly 13 , 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 is shown in FIG.
As shown in c, it has a large number of through holes 33 on the side surface,
At each end, locking portions 34 are provided at approximately 90° intervals.
35 is formed. And this locking part 3
Reference numerals 4 and 35 are formed by connecting large-diameter through-hole portions 36 and 37 and small-diameter through-hole portions 38 and 39, respectively. Here, the microphone unit 31 is the sixth microphone unit.
As shown in the figure, a microphone main body 40, a weight 42 having a mounting portion 41 that clamps the rear peripheral side of the microphone main body 40, and a first unit cap 44 that covers the microphone main body 40 from the front sound collection section 43 side. and a second unit cap 45 that covers the weight 42 from the rear side. The weight 42 is made of a metal material and, as shown in FIGS. 7a and 7b, is cylindrical in shape and has a through hole 46 formed in its center. Mounting portions 41 are provided at one end of the weight 42 at approximately 90° intervals. This attachment part 41 has a step in the shape of a crank on the side, and has a first attachment part 47 and a second attachment part 47.
A mounting portion 48 is formed. The microphone main body 40 is placed between the first mounting portion 47.
The weight 42 and the microphone main body 40 are attached by fitting the rear circumferential sides of the microphone body 40 . At this time, the connection wires 21, 21 extending from the rear part of the microphone body 40 are connected to the weight 42.
is inserted through the through hole 46 and led out to the rear surface of the weight 42. Note that FIG. 7b is a cross-sectional view of the portion indicated by the dashed line in FIG. 7a. Further, the first unit cap 44 is connected to the eighth unit cap 44.
As shown in Figures a, b, and c, a substantially cylindrical hanging portion 50 having a diameter smaller than that of the cap portion 49 is formed at one end of a substantially cylindrical cap portion 49, and the side surface is substantially convex. There is. A pair of collar parts 51, 51 are formed at an appropriate interval at the tip of the hanging part 50,
A recessed portion 52 is formed. Then, by inserting the opening of the cap part 49 between the side surface of the microphone main body 40 and the second mounting part 48 of the weight 42, the microphone main body 40 and the second mounting part 48 of the weight 42 are inserted.
A unit cap 44 is attached thereto. 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 the same structure as the first unit cap 44, and has a weight 4.
It is attached to the rear of 2. Next, the microphone unit 31 configured as described above is placed inside the frame 30 using the elastic member 32.
The hanging means will be explained below. That is,
As shown in FIG. 9, the elastic member 32 is formed with portions extending linearly from each other in a cross shape, and a through hole 53 is formed in the center thereof. Furthermore, a flange-like 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 large diameter through hole 36 from inside the frame 30.
to the outside of the frame 30, and slide the stopper 54 in the direction of the small diameter through hole 38. Therefore, the stopper 54 is locked to the locking portion 34 of the frame 30, and the first unit cap 44 is eventually suspended from approximately the center of the frame 30 via the elastic member 32, as shown in FIG. be. The second unit cap 45 is also suspended from the frame 30 by an elastic member 32 in substantially the same manner as shown in FIGS. It is suspended within a frame 30 as shown in FIG. According to the microphone vibration isolation mechanism according to the basic example configured as described above, mechanical vibration caused by rotation of the motor of the camera body, etc. is absorbed by the elastic member 3.
2 and being transmitted to the microphone unit 31, it is possible to eliminate problems such as deterioration of the S/N ratio as in the prior art. In addition, the microphone unit 31 is arranged in four directions (total 8 directions at both ends).
direction) and the elastic member 32 is pulled from the first
Since it is securely attached to the hanging portions of the second unit caps 44, 45 and the locking portions 34, 35 of the frame 30, the microphone unit 31 can be supported stably and reliably. Further, in the above basic example, the microphone unit 31 is hung from four directions, but it may be hung from three directions as appropriate. By the way, the microphone vibration isolation mechanism according to the basic example configured as described above is such that the microphone unit 31 is made of elastic material such as rubber that simply extends linearly in the radial direction from the center of both ends of the cylindrical frame 30. Since it is supported in a suspended state by the member 32, the elastic member 32 itself cannot have sufficient compliance, so there is a certain limit to the vibration absorption effect and large vibrations are transmitted to the microphone unit 31. It had the disadvantage that it was easy to use. Therefore, this invention was made with this point in mind in particular, and the microphone unit is supported by a wide ribbon-shaped elastic member in the cylindrical axis direction of the frame 30, which can provide a sufficiently large compliance. It is characterized by points. Next, an embodiment of this invention based on the above outline will be described with reference to FIGS. 13a, b, and c. However, in this case, the configuration according to the basic example shown in FIGS. 1 to 12 described above, excluding the microphone unit hanging support part shown in FIGS. 4 to 12, is the same as the basic example in this invention. Since the configuration is similar to that of , the explanation thereof will be omitted. That is, in this invention, instead of the elastic member 32 of the basic example, as shown in FIGS. elastic member 32'
is used. That is, since the ribbon-shaped elastic member 32' can have a sufficiently large compliance by itself, the microphone unit 31 can be supported within the frame 30 with greatly improved vibration absorption effect. It becomes like this. FIG. 14 shows another ribbon-like elastic member 32'' which is formed in a substantially cross shape from the front and has a portion extending so that each side is wavy. The invention is not limited to the embodiments, and can be implemented with various modifications without departing from the gist of the invention.Therefore, as detailed above, according to this invention, a sufficient vibration-proofing effect can be achieved. Therefore, it is possible to provide an extremely good microphone vibration isolation mechanism that is capable of stably and reliably supporting the microphone.

[Brief explanation of drawings]

Fig. 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, Fig. 2 is an exploded view showing the configuration of the microphone section, and Fig. 3 is a top view of the microphone section. FIG. 4 is an exploded view showing the configuration of the case assembly, FIG. 4 is a side sectional view showing the configuration of the microphone assembly of the microphone section, and FIGS. 5 a, b, and c are top views showing the shape of the frame of the microphone assembly, respectively. Figure 6 is an exploded view showing the configuration of the microphone unit of the same microphone assembly, and Figures 7a and b are a front view and a partially sectional view showing the shape of the weight of the microphone unit, respectively. Side view shown in Figure 8a,
b and c are the first microphone units of the same microphone unit, respectively.
9 to 11; a top view, a side view, and a partially sectional side view showing the shape of the unit cap; FIGS. 9 to 11;
The figures are a perspective view showing the shape of the elastic member, a sectional view and a front view showing the state in which it is attached, and Figures 12a and b.
are detailed views showing an enlarged view of Fig. 4, Fig. 13a,
b and c are front, side, and perspective views showing a ribbon-like elastic member used in one embodiment of the microphone vibration isolation mechanism according to this invention, and FIG. 14 is a front view showing another example of the ribbon-like elastic member. It is a diagram. 30... Frame, 31 ... Microphone unit, 32', 32''... Ribbon-shaped elastic member.

Claims (1)

[Scope of utility model registration request] A cylindrical frame, a microphone unit loosely inserted into the frame, and a structure installed between the end of the microphone unit and the frame to suspend the microphone unit within the frame. A vibration isolation mechanism for a microphone characterized by comprising a plurality of wide ribbon-shaped elastic members.