JPS6119593Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holding structure for holding a microphone antenna.

Conventionally, in sound 8mm cine cameras and video cameras, a microphone with a retractable antenna (hereinafter referred to as an antenna microphone) is used as the microphone attached to the camera in order to avoid the effects of noise and vibration from the camera on the recording as much as possible. It is being When using this microphone, I extend the antenna and use it as far away from the camera as possible to avoid being affected by noise. Further, in order to eliminate the influence of vibration, the antenna is held between the microphone cover and the antenna with a vibration-preventing member such as sponge or rubber interposed therebetween. Normally, camera vibrations have a major effect on recordings in the range from several 10Hz to 2KHz, but when using this sponge, the high frequency parts in those ranges can be absorbed, but the vibrations from several 10Hz to several kHz can be absorbed.
It cannot be said that the frequency range up to 100Hz is sufficiently effective, and the vibrations are transmitted to the microphone sound collection member, which vibrates more than the vibrations, and eventually converts the vibrations into sound. , it ends up being recorded as noise.

In the present invention, this problem is solved by holding the antenna with a plurality of pincushion springs. That is, the maximum diameter part of each spring is in contact with the inner peripheral surface of the cylindrical microphone holder, and the minimum diameter part of each spring is configured to fit into the outer diameter part of the microphone antenna, thereby holding the microphone antenna. . In this case, the microphone antenna is normally held stably by using a plurality of springs each having a small spring constant. Also, when vibration is applied to the microphone antenna, the load is not applied to all of the holding springs as an equal load, but the vibration occurs in such a way that the displacement increases toward the tip of the antenna, so in this case,
Since the resonant frequency of each spring is sufficiently low, the frequency of vibration transmitted to the antenna can be suppressed sufficiently low. If this frequency is kept below 20Hz, even if the electrical output caused by it is reproduced, it will not be audible to the human ear, and the quality of the reproduced sound will not be impaired in any way. Therefore, it can be said that such a microphone antenna holding structure is very effective.

A detailed explanation will be given below with reference to the figures.

FIG. 1 is a diagram showing a state in which a microphone having a telescoping antenna is attached to a camera. 1
2 is a camera body, 2 is a lens barrel, 3 is a microphone holder, 4 is a microphone antenna, and 5 is a microphone sound collection section.

FIG. 2 shows a cross section of a conventional camera-mounted telescopic antenna microphone. 3 is a microphone holder,
4 is a microphone antenna, 5 is a microphone sound pickup section, 6 is a stopper, and 9a and 9b are anti-vibration sponges for holding the antenna.

FIG. 3 is a diagram showing an embodiment of the present invention. 7
From a to 7f, vibration isolating springs are shown.

First, the embodiment shown in FIG. 3 will be described. Inside the holder 3, a plurality of springs 7a to 7f are housed, with the maximum diameter portions of the springs touching the inner diameter. This number does not have to be six as in the embodiment, but should be appropriately determined depending on the weight of the antenna section, weight distribution, vibration condition, dimensions of the antenna and holder, etc. The smallest diameter portion of the spring fits into the outer diameter of the antenna. Here, each spring is held at two locations on the inside diameter of the holder and one location on the antenna, but these contact locations may also be changed as appropriate. 6 is a stopper that prevents the spring from coming off the holder. 8 is a washer that prevents the springs from interfering with each other. With this configuration, the spring constant of each spring can be kept very low. This is because the spring only needs to be able to hold the antenna part overall, so if you want to lower the spring constant, you can change the spring's wire diameter, number of turns, and free height. This is because the number should increase.
In this case, the overall spring constant must be within a range to hold the antenna part, but since vibration is not applied uniformly to each spring, the lower the spring constant of each individual spring, the lower the resonance point. The antenna section only vibrates at a low frequency, which will no longer adversely affect recording. Furthermore, by changing the winding pitch of each individual spring, etc., we can create a spring whose displacement changes non-linearly in response to force, so that the displacement of the antenna is suppressed within a certain amplitude range in response to strong impact vibrations. This can prevent shock noise caused by impact, and also protects the microphone sound collection section. As described above, according to the configuration of the present invention, a telescopic antenna microphone attached to a camera can have a very suitable structure.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a microphone with a retractable antenna attached to a camera, Figure 2 is a diagram showing a conventional microphone antenna holding structure, and Figure 3 is a diagram showing a conventional microphone antenna holding structure.
The figure shows an example of the configuration of the present invention. 3... Microphone holder, 4... Microphone antenna, 5... Microphone sound pickup section, 6... Stopper, 7
a to 7f... Anti-vibration/holding springs according to the present invention.

Claims (1)

[Scope of utility model registration request] a microphone antenna having a microphone sound collection member attached to its tip; a microphone holder having a cylindrical inner circumferential surface; and a microphone holder whose outer diameter portion is in contact with the inner circumferential surface of the microphone holder and whose inner diameter portion is connected to the antenna. A holding structure for a microphone antenna comprising a plurality of pincushion springs arranged to hold the microphone antenna.