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JPS5468627

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DESCRIPTION JPS5468627
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial schematic view of the present
invention, and FIG. 2 is a sectional view of the same. 1 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Permanent magnet,? ? ? ? ? Yoke, 8 ░ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
??????????????????????????????????
? ? ? ? ? ? ? ? ? Aluminum coil, иииии Lead wire, 13 и и и и и и и и и и и и и и и и и и и External
terminal.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
planar drive microphone. Heretofore, this electrodynamic planar pivot microphone has a
vibrating membrane in which a zigzag or spiral coil is stretched between the opposing planar
magnetic poles. Efforts have been made to reduce the weight of this vibrating membrane (in
order to increase the conversion efficiency of the microphone and to accelerate the transient core
(? ?) 4, 7W /, 527 answer as much as possible. However, recently, the thickness of this
vibrating film has become extremely thin, for example, a thin film in which 20 microns of
aluminum foil is bonded to a highly insulating material of 4 microns in thickness via an adhesive
layer of 3 microns. It is used. Then, as a lead wire of the coil stretched on this vibrating
membrane, a thin copper wire is attached with a solder, joined with a conductive adhesive and
drawn out to an external terminal. In this case, it is extremely lightweight The amount of nonda
or conductive adhesive added to the peristaltic reciprocation is largely 1 for the vibrating
membrane m level, giving an adverse effect on the conversion efficiency and transient response
of the microphone, and the regrind resonance frequency and frequency There was a defect that
the variation of one product etc. occurred in the characteristics etc. The present invention is
intended to solve the above-mentioned drawbacks, to reduce the weight of the vibration system
and to improve the sensitivity of the microphone, and to provide an electrodynamic planar drive
microphone of uniform quality. Hereinafter, an electrodynamic flat drive microphone according
to the present invention will be described with reference to (2) drawings. In Fig. 1 and Fig. 2, (1)
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is a vibrating membrane consisting of a thin layer of high-insulation material such as polyimide,
polyester ester, etc. This vibrating membrane is supported inside the microphone center by edge
+21, Also, permanent magnets (3) and (4) are disposed opposite to each other with a slight gap
on both sides thereof. The permanent magnets (31, (4) are in the form of a ring on a concentric
ring, and adjacent magnetic pole surfaces have alternate true polarities, and are fixed to the yoke
(61, +71) having the introduction holes (5). There is. + 81, (81 is a support frame in which a
through-hole is provided at the center, sandwiching and supporting the edge (2) at the center,
and interposed between the yaw (6 +, (71 (91, QQ are bolts and nuts for fixing the yoke 16+, 71
through the support frame (ill, +81, and the bolt (9) is a support frame through the hole of one of
the yokes (6) (81, (the end of which is inserted into the hole of 81 and protrudes from the other
yoke (7)) is fastened by snapping to constitute the microphone body. The permanent magnet is a
spiral coiled al (3) mini ram coil stretched on a surface of the vibrating membrane (1), for
example, by the print yield etc., and the permanent magnets are disposed adjacent to each other.
The magnetic flux generated between the pole faces of (3) and (4) crosses the aluminum coil (2)
at a right angle.
(2), i is a lead wire consisting of a thin wire with a thickness of 50 microns or less, preferably 25
microns to 50 microns O gold, this lead wire is one end Q ░ C. and the other end (b) of the
aluminum coil (b) Diffusion bonding is performed on both ends of each by, for example, means
such as ultrasonic waves. That is, the connection of both lines presses the aluminum wire and the
gold wire, and when the energy of the ultrasonic wave of usually 30 to 60 Ktlz is applied to this
part for about 01 to 0,3 seconds, the frequency of the aluminum wire and the gold wire becomes
high More and more, it vibrates in a violent manner, and adheres the image by partially diffusing
and diffusing. Thus, the lead wire (2) is connected to an external terminal which is provided at
about the center of the yoke (7) via an insulating spacer (d), and the lead wire @ is The support
frame (81, (s + is pulled out from the intermediate joint to the outside. (4) The reason why gold
thin wires are used as the lead wire of the present invention in the present invention is that, as
shown in the table below, the diffusion coefficient to aluminum is relatively high for gold, and
also it is rich in elongation, ductility and wire thinning Gold wire is suitable as a thin wire
because it is easy to Specific gravity Young * Kg W! ! Resistivity ? и 1111; Sparrow 2 О 2:
Person gold 19.20.81 XIO '2.2 X 10-'1.3 silver 10, 530. 805 X 10 @ 1.62 X 10-' 0.21 steel 8, 96
1.25. 25 x 10'1. 72 x [email protected] 015 al monium 27080. ????????? The thickness of the gold
wire is 50 microns or less, preferably 25 microns to 50 microns. If the thickness exceeds 50
microns, the mass of the thin wire to the vibrating membrane increases and the vibrating
membrane And the frequency characteristics etc. are not good, and the cost of one product
increases, which is not preferable from the practical point of view. On the other hand, if it is 25
microns or less, the electric resistance increases, and the bonding operation becomes
complicated. (?) It should be noted that a specific embodiment of the present invention is not
limited to the above embodiment, and a vibration in which a zigzag aluminum coil is stretched
between magnetic poles in which rod-like permanent magnets are arranged opposite to each
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other. Also in the case of a microphone provided with a film, it is possible to carry out diffusion
pressure bonding using a gold thin wire as a lead wire. Since the electrodynamic planar drive
microphone according to the present invention configured as described above is provided with a
thin gold wire of 50 microns or less in thickness as a lead wire, (a) the additional mass to the
diaphragm can be reduced (port) The compliance of the lead wire can be made larger than the
compliance of the vibrating membrane, and the lowest resonance frequency can be lowered. (3)
It has practical effects such as achieving uniform quality.
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