JPS5850700Y2 - microphone - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microphone configured to support a microphone unit in a vibration-proof manner within a case to prevent noise from being generated.

For example, when attaching a microphone to a movie camera and recording at the same time as shooting, vibration noise from the motor, film advance mechanism, etc. associated with the operation of the camera will enter the microphone and be recorded as is unless anti-vibration measures are taken. This will result in

In order to prevent this phenomenon, the conventional method was to attach the microphone to the camera using an elastic body in a vibration-proof manner, but with this method, the structure of attaching the microphone became complicated and the appearance became unsightly. I can't avoid it getting worse.

In the present invention, a microphone unit is coupled to the case via a diaphragm-like elastic body within a microphone case, and a small hole is formed in the elastic body to make it less susceptible to noise caused by external vibrations. This eliminates the inconvenience of

The present invention will be explained below with reference to a practical example shown in the drawings.

In FIG. 1, reference numeral 1 denotes a microphone case, to which a sound-transparent cover 2 made of a perforated plate or a mesh is coupled, and the cover and the microphone case 1 surround the microphone case 1 to house a microphone unit 3 therein.

A weight 4 is coupled to the lower part of the microphone unit 3, a groove 5 is formed on the outer periphery of the weight 4 near the center of gravity of the unit 3 and the weight 4, and an elastic support 6 of rubber or the like having the shape shown in FIG.
A thick inner periphery 6a is fitted into the groove 5, and a groove 7 is formed in the cylindrical outer periphery 6b of the elastic support 6 to engage the circular protrusion 8 of the case 1. The microphone unit 3 is coupled to and supported by the case 1 via an elastic support 6.

The inner and outer peripheries of the elastic support body, the weight, and the case may be connected by a structure other than the above.

A diaphragm-shaped thin part 6 is provided between the inner and outer peripheries of the elastic support 6.
A small hole 9 is bored in the thin wall portion 7 as C.

10 is a support rod coupled to the microphone case 1, and 11 is a conductor for taking out microphone signals.

In this way, the microphone unit 3 is attached to the elastic support 6.
The microphone unit 3 is supported by the case 1 via the microphone unit 1, and is covered by the cover 2 and housed within the case 1 and the cover 2, so even if the case 1 vibrates, this vibration is hardly transmitted to the microphone unit 3.

Therefore, even if the support rod 10 is attached to a movie camera without using a buffer structure or with a simplified structure, the microphone unit 3 will not emit a large vibration noise signal.

However, according to experiments conducted by the present inventor, it has been found that merely elastically mounting the microphone unit 3 within the case is still insufficient to effectively prevent noise.

That is, as shown in FIG. 3, when the inner and outer peripheries of the elastic support 6 are connected by several elastic arms 6d of the same body so that sound and air 75 can freely pass through the elastic support 6, the microphone unit 3 Although the unit was supported by case 1 as a buffer, the vibration noise level picked up by the unit had a high peak as shown in FIG.

FIG. 4 records the frequency characteristics of noise when a vibration with a vibration acceleration of 0.2 G is applied to the microphone supported as described above.

Further, when similar vibrations were applied to the elastic support 6 without providing the small holes 9, the vibration noise level became lower as shown in FIG. 5, and as the position moved, the noise range tended to widen.

According to the present invention, when two small holes 9 with a diameter of 0.7 mm are provided in the elastic support 6 and a vibration acceleration of 0.2 G is similarly applied, the vibration noise level is as shown in Fig. 6, and the peak value is 5
Similar to the figure, the frequency range has become narrower.

In this way, the present invention supports the microphone unit inside the case using a thin partition-like elastic body with small holes and air damping, resulting in (1) the elastic support 6 coming out of the microphone case; Since there is no paper, it looks good and is convenient to handle.

(2) By making small holes 9 in the elastic support 6, the noise level due to vibration is reduced and the frequency range of the noise is narrowed.

(3) A buffer mechanism can be made unnecessary or simple when used by being attached to a device that generates vibrations such as a movie camera or a tape recorder.

There are other effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the microphone of the present invention, Fig. 2 is a half-cut perspective view of the elastic support, Fig. 3 is a perspective view of the elastic support allowing free passage of sound and air, and Fig. 4. is the vibration noise characteristic curve of the microphone when using this elastic support,
FIG. 5 shows a vibration noise characteristic curve when the elastic support 6 is not made with small holes, and FIG. 6 is a vibration noise characteristic curve when the elastic support 6 is made with small holes. 1...Microphone case, 2...Cover, 3...
- Microphone unit, 4... Weight, 6... Elastic support, 6a... Inner circumference, 6b... Outer circumference, 6C...
Thin part, 9... small part

Claims (1)

[Scope of utility model registration request] The weight 4 is attached to the microphone unit 3, and the inner circumference 6a,
The inner periphery 6a of the elastic support 6 has a diaphragm shape consisting of an outer periphery 6b and a thin wall portion 6C, and has a small hole 9 in the thin wall portion 6c.
The microphone unit 3 and the weight 4 are attached near the center of gravity, the outer periphery 6b is attached to the microphone case 1, and the microphone unit 3 is surrounded by the microphone case 1 and the sound-permeable cover 2 attached to the case 1 to provide cushioning support. microphone.