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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a diaphragm showing a voice
coil pattern according to a first embodiment of the present invention, FIG. 2 is a plan view of the
same magnet plate, and FIG. 4 is a plan view of a diaphragm showing a voice coil pattern
according to a second embodiment of the present invention, and FIG. 5 is a plan view of the same
magnet plate. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · start of
winding, 7, 8 · · · · · · coil circumference, 9-12. 29-34 ......
The present invention relates to a dynamic type electroacoustic transducer used in, for example,
a speaker, a headphone, a microphone and the like, and in particular, a substantially uniform
image pickup over the entire diaphragm surrounded by two magnet plates. Dynamic driving
force 2- notification 1 self S ·! The present invention relates to a push-pull planar drive type
electroacoustic transducer which gives 00; '. As is well known, the basic structure of a push-pull
type flat drive type electroacoustic transducer comprises a diaphragm fixed at least at the
periphery and vibratably supported, and a voice formed over substantially the entire surface of
the diaphragm. It consists of two magnetic plates arranged opposite to each other across the
diaphragm in order to produce a magnetic field such that the vector product of the coil and the
current flowing through the voice coil has the same sign in each part of the voice coil. Here, the
present applicant has previously proposed an electroacoustic transducer in which the voice coil
pattern is concentrically arranged in Yotsuri in Japanese Utility Model Application No. 55-15303,
etc. When assembling the magnet plates so as to face each other, there is an advantage that a
product having a prescribed conversion efficiency can be reliably obtained even if there is a
slight positional deviation between the two in the circumferential direction. However, in this
electroacoustic transducer, the pattern of the voice coil passes through the center of the
diaphragm 3-(Li ...). Since the lower magnet plate and the lower magnet plate do not have a
symmetrical relationship with respect to the crucible, it is necessary to arrange the magnetic
poles so as to have an antisymmetrical pattern with each other, and the two-magnet plate is
manufactured. There was a drawback of having to The present invention has been devised in
view of the above problems, and aims to share the same magnetic pole pattern as each magnet
plate under the gate. It is characterized in that the voice coil pattern on the plate is symmetrical
with respect to the line Ili passing through the center of the diaphragm. Hereinafter, preferred
embodiments of the present invention will be described in detail with reference to the attached
drawings. FIG. 1 shows an example of a diaphragm used for an electroacoustic transducer
according to the present invention (hereinafter referred to as a first embodiment). As shown in
the figure, the conductor 1 is printed on the surface of a nonconductive thin plate (for example, a
polyester film) formed into a disk shape using a method such as photoetching, and the voice coil
2 is shown. And the beginning and end of winding of the voice coil 2) 4) '' I12.,., □, 1.00 n 1; The
outer cluster pattern electrode 4 is formed in a predetermined pattern.
That is, when the pattern is described in detail, a through hole 5 for inserting an
electroconductive toner member to reach it is formed at the center of the vibrator 1, and a
predetermined hole is formed along the periphery of the through hole 5. The outer
circumferential pattern electrode 3 is formed by forming the conductive pattern in an annular
shape with a width, and the outer circumferential pattern electrode is formed by forming a
conductive pattern in an annular shape with a predetermined width along the periphery of the
diaphragm 1. 4 is configured. On the other hand, the pattern of the voice coil 2 can be
metaphorically expressed as follows. First, one linear father circularly winds a strip-shaped
conductor at least two or more times in one plane to form a single coil, and an inner peripheral
pattern electrode is formed on the inner side of a monkey formed by the coil. 3 to determine an
arbitrary point P on the circumference of the coil at the center of the diaphragm 1 so as to locate
the center of the diaphragm 1, and determine the winding start end 6 of the coil at the center of
the diaphragm 1 The coil circumference 7.8 1, 10 8, which is located in the part and extends
from the point P to its own force, is 5-shoulder of the peristaltic plate 1,! ¥ 亦 1 □. . 6; □ Round
about 1/2 center clockwise about the center point in a true circle, then reverse the winding
direction to make a true circle about 1⁄2 round along this turn F # 19 The winding direction is
reversed again, and winding is carried out along the winding layer 10 and along the outer
peripheral pattern electrode 4 in a substantially round shape. Then, the direction of winding is
reversed in history and wound according to the above, and finally it is continued at point P for 1
jl I. Further, the winding end point 13 of the coil is connected to the outer peripheral pattern
electrode 4. Therefore, a plurality of concentric 3Ji 9 to 12 formed by one coil periphery 7 or 8
as a whole exist, and a symmetrical winding pattern is obtained. なお。 The wound layers 9 and
11 are dusts of one turn, and the wound layers 10 and 12 are of l / 2 turns. The force of the two
magnetic plates disposed around the diaphragm is the same magnetic pole pattern and is
configured as shown in FIG. That is, the magnet plate 14 corresponds to the size of the
diaphragm 1, and the surface of the disk-like magnetic plate having the through hole 15 at the
center, as shown in FIG. 1 + / l ';?, 114 · 2 □, -z-100: j magnetization formation. The patterns of
these S & N and N poles are formed corresponding to the pattern of the voice coil 2 in the
diaphragm 1, that is, wound layers 9, 10 having a forward current or wound layers having a
negative frost flow. 10.12 corresponding to both 011 l edges]].
Here, as described above, the wound layers 9 to 12 constituting the voice coil 2 are formed so as
to be substantially in the form of a table except for the turn-back portion Q1 ′ ′ Q4 to the next
J # respectively. Since the winding layers 9 to 12 are in a concentric relationship, the S pole and
N pole patterns formed on the magnet plate 14 are also perfectly circular for the portions
corresponding to the inside of the voice coil pattern. Become a concentric relationship. Reference
numeral 16 denotes a transition surface area of the magnetic pole. In addition, since the folded
back portions Q1 to Q4 of the wound layers 9 to 12 constituting the voice coil 2 are substantially
symmetrically distributed about the center point of the diaphragm 1, they are not concentric with
the magnetic poles of the magnet plate 14. The inner part is also dispersed, so even if the magnet
plate 14 is used in reverse, it will be one fu 4 oil cold; 1.74 evening 101+) times. -7, When the
pair φ is i, for example, as shown in FIG. A conductive cylindrical .. tome member 20 in which
seven rungs 19 are formed is used as i, and a magnet plate 14. The yoke plate 21 and the
electrode forceps 22 are sequentially inserted, and from the other side, the diaphragm 1, the
inner circumferential spacer 23.2. The magnet plate 14, the yoke plate 24 and the washer 25 are
deeply inserted into II7 +, and then the b-hole 17, 180 peripheral wall is made ········! ? Crush and
crush as if expanding to an external force. Thus, the diaphragm 1 is held and fixed at its central
portion by the inner circumferential spacer 23 and the 7 flanges 19 and is fixed to the electrode
ring 26 and the magnet plate 14 of the upper blade which are laminated to the lower magnet
plate 14. The peripheral portion is held and fixed by the outer peripheral spacer 27, and the fcW
pressure is induced by the voice coil 2 through the fc electrode terminal piece 28 by protruding
from the [It pole terminal piece 22 and the electrode ring 26]. Take out, m, 'j +' l, -8-'". A signal W
stream can be supplied to the Qligo or voice coil 2. On the other hand, in the first embodiment,
the pattern of the voice coil 2 is formed in triple concentric circles, and the magnetic pole pattern
of the stone plate 14 is also formed in triple concentric circles. For example, as shown in the
second embodiment of FIGS. 4 and 5, each butter 7 may be formed in four layers. That is, the
voice coil 2 is formed in six layers as in the winding layers 29 to 34. The pattern of the voice coil
2 may be 41 concentric circles.
In FIGS. 4 and 5, the same components as those of the first embodiment are indicated by the
same reference numerals and the description thereof will be omitted. Furthermore, although the
first and second embodiments described above are applied to an electroacoustic transducer
adopting a peristaltic plate in which both the central portion and the peripheral portion are fixed,
the peripheral portion The present invention is also applicable to the structure of fixing the
diaphragm only. In this case, both the winding start end and the winding end of the coil are at the
circumference of the circumference of the imaging 41I plate, -9-mill, 101. ! It is good to arrange
it in the taste section and take out the output terminal separately from the front and back of the
伽 d gold. As is clear from 1 Yu's 'Yu' case I clear, light, ir 当 当 当 (当 こ 寸 寸 寸 寸 ボ イ ス コ
イ ル コ イ ル コ イ ル コ イ ル コ イ ル pc pc pc pc pc pc pc pc Since it is formed, use the same
magnetism on the stone plate: 2 ・ · · Stone plate, つ; さ 着 着 咋 咋 咋 埋 埋 埋 埋 幸 幸 幸 幸 幸
Haru. 4 [11 simple description 1 j + Figure 4 is a 1'-view of a slope @ showing a voice coil pattern
according to the first embodiment of the present invention; Figure 2 (a plan view of a tapping
machine; 1 fti overhead view which shows a 3 [. Part 41-'4 is a 1'fL view of the vibration method
showing the pattern of the voice coil of the second actual example of this consideration, and FIG.
5 is a drawing 1 for the same magnet second l. 1 ·················································································· Coil
winding 9 to 12. -1 '1 fist ,,, 101. To (13 ...... winding end Oki 14 ...... magnet plate utility model
registration applicant Japan Musical Instruments Manufacturing Co., Ltd. Daihitsujisaru's
attorney Salts ", 1) collected by a (1 'camphor tree kj' tatami 1 or 11-1 0 '1 discharge 1 Fig. 1 Q4
(',-, -11 '+ 2', 57 CQ 2 Q 2 Fig. 2 S '' 6, / 15-1- 1 J8291 "1- 101;) 6/23, / 14 SNSI 'tj' Ij, 'S:', N- ",
police S · ˜ SNN ', S, N 519 / ゝ 21201281917' 31 & LG Fig. C C343357) and S age i 5-7 C
118291, 3 1e agent # buried Towada Naru
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