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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the magnetic circuit
of a conventional ribbon acoustic transducer, and FIG. 3 is a magnetic circuit of a ribbon acoustic
transducer according to an embodiment of the present invention. FIGS. 4A and 4B are views
showing the magnetic flux distribution of the magnetic gap of the magnetic circuit of the prior
art and the present invention, respectively, and FIG. 5 is a view showing the magnetic flux density
of the magnetic gap. DESCRIPTION OF SYMBOLS 1 ... Magnet 2, 2 ... Magnetic yoke, 3, 3 '...
Magnetic pole, 4 ... Magnetic space ¦ gap, 7 ... Vibration film, io, io', 11, 11 '... inclination Surface,
12, 12 '... groove. Fig. 2-83-Japanese Utility Model Application Publication No. 52-37935 (2) Fig.
3 Fig. 4 ((4) (8) Fig. 5 -I Ichigata 1
Detailed Description of the Invention In the present invention, a magnetic peristaltic membrane
or rt4 dragon layer or tf 4 '[Ji! I would like to thank you for the magnetic circuit of the flat-core
flat all-layer film arrangement and the running-pong sound 41 converter. In some cases + + Bonn
sound * *-* Compared with moving coil type converter (Meina Denk type sound box Shunbumi
device K). Vibration wam ** warehouse KaSusumu points and 珈 - knitting or dedicated Ru Ui is
in or Ii in Kuruwa by Okuku, l Bo 5 form t% Kaya twenty-two instrument magnetic circuit of the
magnetic air tumor length 〃 · Long, thick thickness of the connection · · · 會 會 磁 束 ト さ い さ
い さ い さ い 欠 点 欠 点 欠 点 欠 点 欠 点 欠 点. As described above, the present invention
relates to the improvement of the 11 Zen acoustic transducer, which is a basic # 1 nose, and the
increase of the magnetic flux density, and the inside of the magnetic empty pupil. The
equalization of the magnetic flux density in the direction parallel to the magnetic flux of the ! 11
Figure 11121! It is shown a cross section of a magnetic circuit of a conventional 11-bon type
acoustic transducer), and magnetic WLs 2 21 in the shape of a broken lWL are attached to both
sides of the magnem measuring section 0 respectively. Magnetic @ 3 of the end of the magnetic
yoke 21 z. S'lli 'Ka [airy knee 4 or formation * hhos, y up Fi & collision 3, WK 堡 で あ ★ it's a
notch part). Cut with! ! 1 part 6.6 'is a pressure plate which doubles as a magnetic pole. 6 'or 1
fixed. Seven pieces are arranged in the above-mentioned magnetism 9'4 and 7w1's wrong, and
both measuring parts of this vibrating membrane 7 are held blind by the above-mentioned
pressers 16, 6 'and s, s, a' respectively. In the prior art example shown in FIG. 2, inclinations
PTfBm, 8 ', 9 and 9' are formed on the magnetic pole 3 'and the magnetic pole 5-116,
6', respectively. ing. FIG. 4 is an enlarged view of the magnetic pole gap 4 of the conventional
example shown in FIG. 1, and FIG. 4 is a view of the conventional & receiving circuit. The flux is
distributed as shown by the AK broken line, and the magnetism is shown as a to 11111 @ l! The
magnetic flux in the two gaps 4 is close to the magnetic flux @ M # f @ pole 8 ° 1, the central
part is low, and the uniformity of the flux mesh is very bad. Above r As in the conventional
example, in the case where the 密 密 is densely or unevenly distributed in the magnetic air gap 4,
d uniform vibration can not be applied to the d vibration 1i 117, and the same wave number
characteristics The problem is that there is a defect that the high-wave distortion characteristics
are sensitive, and the problem is that the above-mentioned conventional defects are eliminated,
and the ground density in the magnetic gap is increased and made uniform. In the following, one
embodiment of the present invention will be assigned the same reference numerals as in FIG. 11
with the same numbers as in FIG. $.
fK formation thiM slope *, 41, q1 '# ia! 10. Presser rod serving both as a light and 16 'circle
formed inclination-h>, both inclination holders 10. And 11 and 1α and 11 ') V-shaped groove
12, 42' formed on the S-pole surface-magnetic field distribution of the magnetic gap in the
embodiment of the present invention. 4), as in the present embodiment, in order to obtain a part
KV-shaped l112.1rt of ecms and the magnetic flux 1 position of a single air-4 f 1 crane
decreases, a bundle of S air 9 @ 4 He is a writer and a teacher. Il @ b's figure II4 Fig. AK Shown in
the conventional example 1111 KV #! -Imagining the groove of the form, I wonder if it's a eating
pigeon! -Indicates the degree of writing of magnetic flux in--(C), and when v-shaped D # s is
formed, magnetism! You can lower the part of the end of the II part once hh. In the case of the
conventional example showing the length of lifting film 7 as shown at ear 4 @ B and the case of
Oka-Kashiura, this magnetic board showing II4II 1 ml K is used, and the conventional air-space
length is the conventional one. Example of magnetism! Compared with the apparent length, it
appears that the energy of the magnet 1 can be deposited more than the apparent reluctance of
2J * a11 & <not less than K) and the magnetic resistance thereof by 8 only. For this reason,
according to this study, the magnetic flux I of the magnetic air gap is as shown in C of Army 6 in
FIG. It can be increased by one degree. In the above I'll example, it is a good book if it is a V7shaped #I in part of the FiS 魯 耀 surface, or if it is a gutter-shaped groove instead of a 7-shaped.
According to the present invention, the following effects can be obtained according to the
present invention. 0) Since the magnetic flux density in the magnetic field can be made uniform,
a uniform driving force can be applied to the peristaltic force 11! It is possible to flatten the awave # characteristics and to improve the harmonic distortion characteristics. A thin film-type
acoustic transducer with good performance can be obtained because the effective area tm of the
mlimb film can be reduced without increasing the density t tt. Simple tii of the 210 plane. FIG. 2
is a cross-sectional view of the magnetic circuit of a conventional thin-film-type acoustic
transducer, and 31% of 11 is a cross-sectional view of the magnetic circuit of a 荀 -bon-type
acoustic transformer in this embodiment lf! g- 雛 4 Fig. A, Id is a diagram showing the magnetic
flux distribution of the magnetic gap of the magnetic circuit of the conventional and the present
invention, respectively ! FIG. 1 is a diagram showing rabbit I bundle IFN. マ グ ネ ッ ト · · · ·
Magnet, 2 · · · 11-iron, 3, 3 '· · · magnetic pole, 4 · · ·-during the magnetic m + 7 · · · · vibrating film,
10 ° 1 α, 11, i' · · · Tilt @ fi-42, 12'- groove. FIG. 646 ・.
□ 22 'FIG. 2 646' □ · 93 Figure '411 "6'176's · 5/1212" +033 · 10'2N82 "/ · 3 Ryo 9351
attorney's name deadline Attorney earth Toshio Nakao 11 / l\1 Gen. 4 74 ° 匍 鴛 (/ 1) 5313
near 111 □ (B) 55 373 'Fig. 5 j □ 50 reef-pole 楊 space 379 35 name of agent agent Inventors
and agents (1) Inventor's address, Osaka Prefecture Kadoma city Ogata Kadoma 1006 Matsushita
Electric Industrial Co., Ltd. Onoma-t · Le Name Ohno-An Ascology Center the same place Thioiha
& 4! Yoshitaka A A Place-Place Parargia! Mr. Toru 4 茨 カ カ カ ジ 寸 ■ k ■ No. m m m 谷
Masahiro (2) Agent address Osaka Prefecture Kadoma city Oda Kadoma 1006 Address
Matsushita Electric Industrial Co., Ltd. Name (6152) Patent attorney Shigeno Shigeno ""- Pe '3' -5