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DESCRIPTION JPS5451830

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DESCRIPTION JPS5451830
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
condenser microphone, FIG. 2 is a frequency characteristic view due to the difference in sealing
property, FIG. 3 is a cross-sectional view showing another conventional example, and FIG. 1 is a
cross-sectional view of a condenser microphone of the present invention. DESCRIPTION OF
SYMBOLS 1 иииии Metal case, 2 иииииии Vibrating film, 3 иии и и и и и и и и и и и и и и Impedance conversion
element, 5 и и и и и и Sections 6 и и и и и и и и и и и cylindrical resin case, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ... clearance. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a case sealing
structure for a condenser microphone, and it is intended to obtain a microphone with good
characteristics by reliably sealing the cavity portion of the back plate of the condenser
microphone. It is As shown in FIG. 1, the conventional condenser microphone is attached to the
vibrating membrane 2 and the back electrode plate 3 on the front surface portion in the metal
case 1 whose rear end is opened, and all the vibrating film 2 and the back electrode plate 3 are
Cylindrical resin case 6 for fixing and forming cavity g5 which also serves as a full housing of
impedance conversion element 4 at the back of back electrode plate 6 is completely fitted, the
rear face is closed with printed circuit board 7 metal case 1 opening The structure is made to
curl and seal the end inward. In this conventional sealed structure, the opening of the metal case
1! If the curling to the inside of 44 is too strong, distortion may occur in the vibrating membrane
2, or deformation may occur in the tubular Ga Tang case 6 or the metal case (2) 1 and the
varnish 1 itself, resulting in a custom-made defect. And an external defect occurs. On the other
hand, if the curl is too weak, as shown in FIG. 1, a gap occurs between the cylindrical resin case 6
and the printed circuit board 70 ((rotation), between the printed circuit board 7 and the curled
portion of the metal case (B), etc. The sealing of the part 5 is incomplete, and as shown in the
frequency characteristic diagram of FIG. 2, the sealing results in a sharp drop in sensitivity (2) at
low frequencies compared to the complete condenser microphone (1). In such a conventional
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structure, there is no elastic component in the component parts, so the tolerance of 4 mm of the
tightening error due to bending of the metal case l is narrow, and even if it deviates from the
optimum value even if it is slightly As it occurs, it was a wood wax to obtain good products. As
means for improving this, as shown in FIG. 3, a structure in which a resilient rubber sheet 8 is
inserted between the cylindrical w-box case 6 and the printed circuit board 70 for sealing is
devised. Although there is a certain effect, the rubber sheet 8 has to be added as a new
component (3),... In addition, the entire length of the case has to be increased by the thickness of
the rubber sheet 8 and there is a drawback such as going against miniaturization. In the closed
structure of the present invention, as shown in FIG. 4, the end face 9 in contact with the printed
circuit board 7 at the rear of the cylindrical detent case 6 is inclined, and the printed board 7 is
fully open. The end of the eye is curled inward and sealed. In the present invention, the periphery
of the printed circuit board 70 is pushed by the curled end of the metal case 10 and is bent along
the inclination of the end @ 9 of the cylindrical case 6 to maintain the seal.
At this time, it is easier to bend the printed circuit board 7 using a thin board, and hence the
folding effect is also large. The sealed structure of the present invention is fully utilized by the
elasticity of the printed circuit board 7, and the printed circuit board 7 is always fully elastic and
in contact with the end opening 9 of the case 6 and the open end curled portion of the metal case
1. In (4) 2), the sealing of the cavity 5 is completely maintained by 1 and no undue force is
applied to the vibrating membrane 2 and the like. Further, the curling strength may be
determined within the range where the printed circuit board 7 is in contact with the inclination
of the end 1fi 9 from the flat surface, the width is within the allowable range, and there is no
need for strict dimensional accuracy as in the prior art. The yield is improved and the work is
simplified.
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