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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an electret condenser
microphone for illustrating a form in which the internal space on the back side of the diaphragm
is communicated with the outside air, and FIGS. 2 and 3 are electrets according to the present
invention. FIG. 2 shows an embodiment of a condenser microphone, and FIG. 2 is a sectional
view, and FIG. 3 is a plan view showing a state in which a windproof member is removed. 1: inner
cylinder, 2: microphone unit, 3 nibrates, 4: sound absorbing hole, 5: diaphragm, 7: outer housing,
8: windproof member, 9: space, 10: internal space, 11: pressure adjustment hole , 1 ζ:
communication groove, 15: windproof device.
The present invention relates to an electret condenser microphone, and more particularly to an
electret condenser microphone improved to prevent cross modulation due to extremely low
frequency components. Generally used electret condenser microphones (hereinafter abbreviated
as E, C, M) have a light mass of the diaphragm and have a structure in which the element is
sealed, so for example, it is assumed that it is used in automatic easting Also, the air pressure in
the room due to engine vibration and road irregularities slightly fluctuates, a large ultra-low-mass
component appears at the microphone output end, and an audio signal is carried on this,
resulting in so-called cross modulation. In order to improve the above-mentioned drawbacks, it is
conceivable to adopt the configuration as shown in FIG. In the figure, 21 is a case incorporating
the element 22 inside, 23 is a sound absorption hole provided on the front side, 24 is a
diaphragm, and 25 is a backing. It is to take a hand or a step of making the air pressure equal by
providing a back pore 26 communicating with the back side of the plate. In addition, various
microphones have been proposed in which a hole communicating with the outside air is provided
on the back side of the high-performance board for the purpose of directivity (for example, if the
number is 5 to 10, the Japanese Utility Model Publication Nos. 39-10206 and 40-15606; 4018241 and 50-24176, each publication etc.). However, in E, C, and M, in the configuration shown
in Fig. 1, winds flow into the air holes 26 when used with a window open in a car or the like or
when the cross wind is strong, resulting in loud wind noises. Clarity is significantly reduced. This
is clearly seen in our various experiments. An object of the present invention is to provide an
electret condenser microphone capable of solving the above-mentioned drawbacks and reducing
wind noise and preventing the occurrence of cross modulation due to an extremely low
frequency component. Hereinafter, an embodiment of the present invention will be described
based on FIGS. 2 and 3. FIG. In the drawing, reference numeral 1 denotes a cylindrical inner
casing in which an electret condenser microphone (EXC, M) unit 2 is broken, and a sound
absorption hole 4 is provided in a plate 3 on the front surface. 5 is a diaphragm and 6 is a
knocking for supporting the diaphragm. The reference numeral 07 denotes a bottomed outer
casing provided so as to enclose the inner casing 1 and having an open front, and the inner
casing 1 is tightly fitted in the outer casing, and the front end of the outer casing is It comes to
project forward than the plate 3. Reference numeral 8 denotes a windproof member made of a
porous material such as urethane foam housed in the front opening of the external squeeze body
7, so that a space 9 is formed between the windproof member 8 and the plate 3. IJV will be.
Inside S space 10 on the side of the heel plate back Il + iI in the inner turtle body 1 is a series 11
in the upper space part 9! In order to make it clear, a pressure drop-smoothing hole 11 is served
at the lower part of the inner casing 1, and a communication groove 12 is served between the
outer case 7 and the inner casing 1 in communication therewith. As a result, the luck A # 12 and
the air pressure adjustment hole 11 become a series-1 path, and the air pressure in the inside
111110 is adjusted! The sound absorbing hole 4 and the inside of the inside 10 are in
communication with the outside air through the same windproof member 8. In the example of
the Kokaki waterfall, the air pressure adjusting hole 11 is radially provided on the inner cylinder
1 and the circumferential groove 13 communicating with the communicating groove 12 is
provided at the inner lower portion of the outer casing 7 correspondingly. It is provided.
Although the number of the communication grooves 12 is not limited to one, it is desirable that
the cross-sectional area be substantially the same as the area of the sound absorption holes 4. In
the figure, 14 is a signal output terminal, 15 is a detachable windproof device for covering the
outside of the windproof member 8 and is made of the same material as the windproof member 8
and has a protrusion 16 at the lower end inner periphery. A gap 17 is formed in [1] with the
windproof member 8 by providing. The windproof device 15 can be selected and used according
to the use conditions such as strong wind, thereby further improving the wind noise reduction
effect. According to the electret condenser microphone of the present invention, the inner body
incorporating the microphone unit is wrapped by the outer body, and the internal space on the
back side of the diaphragm is in communication with the space on the forward side through the
communication path, The sound pressure is adjusted by the common windproof member
between the forward and back sides of the round diaphragm connected to the outside air
through the common windproof member, so that the air pressure slightly fluctuates. It is not
affected by the plaster and can remove ultra low frequency components, it has good clarity and
no cross modulation. Further, in the use test in a car, the wind noise was not recognized even in
the running speed (100 Km / h) running test by opening the window, and a good voice signal of
clearness was obtained. In addition, the directivity can be reduced and ambient noise can be
reduced, and a practically superior effect such as being suitable for weight reduction of small
noises 21 can be exhibited.
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