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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a general
electrodynamic planar drive electroacoustic transducer, FIG. 2 is a shape of a coil, and FIG. 3 is a
sectional view of a diaphragm of the present invention. E voice coil, 5.6 · · · · · · · · · · · · · · · · · · · · · · ·
· · · sound through hole, 殴 帖 ■ Figure 1 Figure 2 Figure 3-71-open 5l-3843i (2)
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
planar drive electroacoustic transducer. An electroacoustic transducer of this type, as shown in
FIG. 1, includes both surfaces K of a diaphragm +11 made of a thin film of insulating material and
a plurality of permanent magnets (2), + 2't, +21 with slight spacing. (31, t, i +, ti) are arranged
opposite each other. In the permanent magnets (21, ti +, (2) and (31, 13), (31, the magnetic pole
surfaces facing each other with the diaphragm (11K interposed have the same polarity, and the
adjacent magnetic pole surfaces are different) It is arranged to have polarity. (4) The permanent
magnet (1), r ': K so that the parallel conductor portion (4) is located between the i-poles, I is
printed on the diaphragm (1) 10 It is formed in a zig-zag shape, as compared to at least one
conductive coil (see FIG. 22). (51, (61 is a yoke, and an acoustic through hole (7) is provided
between the magnets of the upper yoke (5)). In this case, copper or aluminum is used as the
conductive material of the voice coil, but the corrosion resistance is not good. In general, a film is
formed of a synthetic resin or the like to avoid direct contact with the outside air. However, when
forming a diaphragm by attaching a voice coil to form a diaphragm, attaching an insulated and
corrosion-treated linear conductor to a thin substrate Km and forming a Jl plate is a bonding
operation, it is high at 411. It is extremely difficult to perform the bonding operation with
accuracy, and there is a disadvantage that the quality non-uniformity--the cost increases. In
addition, as a method of bonding the fine FllK linear conductor to the group 11, screen printing
method using a copper-clad laminate, a photographic method, an additive method, etc. can be
mentioned. It is impossible to have it, but it is necessary to produce a corrosion-resistant film
separately (and it is necessary to sculpt the mobile plate <it takes time and effort. SUMMARY OF
THE INVENTION The present invention is intended to eliminate the above-mentioned drawbacks
and to provide an electrodynamic flat panel drive electroacoustic transducer having a loose,
highly accurate and corrosion-resistant diaphragm. Next, the draft will be described with
reference to the drawings. As shown in the third factor which expanded the diaphragm (1) of the
first factor K, the vibration M (1) of the present invention is on the surface of the voice coil (4)
deposited via the substrate QIK adhesive layer (8) An oxide film (9) of aluminum, that is, a
passive film is formed. Next, to describe one of the manufacturing methods of the diaphragm
according to the present invention, a substrate (polyester film of 11 microns in thickness) K
aluminum foil (20 i cron of thickness) is bonded using a thermosetting resin as an adhesive.
The thickness of the adhesive layer in this case is about 5 to 10 microns. Next, a photoresist is
coated on the aluminum foil and a coil of a desired shape is formed by a photographic printing
process, an etching process, and then a photoresist removing process according to a known
method. Next, the surface KIN-formed film of the aluminum coil sweetly obtained in this way is
formed as (3) wrinkles, and one example of the chemical conversion solution used in this case is
as shown by IIIK. Na200.soP/ll0rb39V′I。 NaAlO 26 A Immerse the coil in
this solution. The temperature of the solution was about 60 ° C. and the immersion time was 4
seconds, and the thickness of the oxide film was about 1 turn. The corrosion resistance of the
film obtained by removing it from the solution and washing it with 80'O for 20 minutes and then
testing it according to the Japanese Industrial Standard JI 8a3 'F1 to 19 B5 (salt water spray test
method) k It was found to be corrosive. The moving plate obtained by this method hardly
changes in weight and electric resistance as compared with the one before treatment, and is light
and has a good corrosion resistance. This proposal has the effect of being able to replace the
diaphragm with stable quality and good corrosion resistance by weight because it is not a surface
of the coil KEIJ Resistant Resistor as described above, and is for speakers, headphones,
microphones It is widely used as a coil. (4)