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1. Title of the Invention Electro-acoustic transducer ■ Japanese Patent Application Laid-Open
No. 50-1sss @ 27 (1975) 12.18 specification 1, title of the invention 1, title of the invention
electroacoustic transducer 2, particularly a vibrating membrane provided with a conductor in the
range of R11 1 1 11 In the electroacoustic transducer that generates sound waves by 傾斜, it has
inclined afi't- and the sound path by the slit is short at a portion corresponding to the central
portion of the moving film and gradually toward the both ends. The electro-acoustic transducer is
characterized in that it is disposed close to the moving film on the pole piece block 1 formed to
be long and the magnetic pole is applied from the pole piece block to the conductor of the
vibrating film. vessel.
[Phase] Japan Patent Office
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer in which a vibrating membrane provided with a conductor is disposed in a magnetic
field and the number of sounds is generated by current 'kff' in the conductor. Conventionally, in
order to convert an electrical signal into an acoustic image, a horn speaker and a cone speaker
are mainly used conveniently, but all of the conditions as a converter are not satisfied. Dee-Baille
has developed a so-called electro-acoustic transducer of the so-called Bayle type 1 in which the
defect of the conventional transducer has been corrected. FIG. 1 is a top view showing the abovedescribed Bail speaker. An imaging film (7) in which the same magnetic field indicated by arrows
(5) and (8) generated from four 7-car 2-bit magnets (i) tz <button (4) is provided in the center of
this speaker ) And converts a voice current into acoustic vibration by passing a current through a
ribbon-like conductor (not shown in FIG. 1) deposited on the moving film (7). . EndPage: 1 in FIG.
1, (8) (9) shout (2) pole piece for forming a magnetic path, four (2) magnet supporting members,
(4) (b) A nonmagnetic spacer, a frame holding the vibrating film (γ) at (d)-is a cover. In FIG. 2,
the vibrating membrane (7) t-i is a detailed example of the vibrating membrane (.gamma.). Mu.
Plural folds (22 turns 2 #), a ribbon-shaped conductor .quadrature. □□ is applied so as to
extend between the upper and lower sides. In the electrical connection in the conductor, as is
apparent from FIG. 2, every other reverse current flows. That is, the direction of the current
changes alternately from the top to the F and from the bottom to the top. Therefore, now, when
the voice signal 'current is supplied to the conductor in the first direction, the imaging film is
placed at the back of the magnetic field, and according to the law of 7 Raming, as shown in FIG.
The head @ 2 moves in the direction of the arrow (goods), opens in the air layer and closes in the
air layer case, and so closes in the direction of the arrow @. Exhausted. On the other hand, if it is
supplied to the outside of the voice signal charge flLft conductor between the first and the
second ones opposite to each other, the fold @ moves between the arrow examples, and the air
layer fiH @ (311 closes and Layer · 261 (鵜) 鵜 opens, so that in the direction of the arrow μs, it
is drawn in between the
exhaust, the direction of the arrow (至). This generates air support or
sound waves. Due to the structure that the conductor of wide width and the moving film are
integrated and put on the back of the magnetic field to the speaker of the above-mentioned bail
system, it is uniformly photographed over a relatively wide frequency band, and the frequency
characteristic is It has the features of 7 ratts and the difficulty of sustaining divided vibration for
a lifetime, and the features of excellent transient characteristics, good rising of sound, and good
efficiency, etc., since the light-weight imaging film is driven on the entire surface. .
However, this type of format conversion a% has not yet reached full performance. Therefore, it is
an object of the present invention to further improve the electroacoustic transducer as described
above and transducers similar thereto.
[Phase] Japan Patent Office
The following is a detailed description of the invention. According to the present invention, an
electroacoustic displacing device is provided in which an oscillating film provided with a
conductor is disposed in a magnetic field and an acoustic wave is generated by applying an
electric current to the conductor, and has inclined slits. A pole piece block formed so that the
sound path is short at a portion corresponding to the middle-arrow of the vibrating membrane
and gradually lengthened toward the first film thereof is disposed close to the vibrating
membrane, and the pole piece block The invention relates to an electroacoustic transducer in
which a magnetic field is applied to the conductor of the vibrating membrane. For example, the
central part of the sound source (diaphragm) is narrow l! A plurality of plate-like magnetic pole
pieces having a shape such that the sound path consisting of J is shortened are stacked to form
the above-mentioned slit-like space for transmitting the acoustic wave between each one. The
present invention relates to an electro-acoustic transducer in which a sound 111-is formed and a
magnetic flux path is formed with respect to a radiation garo, and a magnetic field is applied to a
vibrating film. With such a constitution, it is possible to form a strong magnetic field gap and
apply the strong magnetic field to the imaging film, and to obtain an acoustic diffusion lens effect
by the pole piece. Therefore, it becomes an electro-acoustic transducer having a very
characteristic immersion. Next, an embodiment of the present invention will be described based
on the drawings. FIGS. 5 to 8a show the application of the present invention to the swing type
Endey of the bail system: 2 force, and FIG. 5 is a top view in the state where a part of the upper
part is removed, FIG. FIG. 7 is a cross-sectional view taken along the line 2--; FIG. 7 is a plan view
showing one pole piece and a spacer in FIG. 7; and FIG. 8 is a perspective view showing a state
during assembly. The speaker of this embodiment has the same configuration as the one
described in principle based on FIGS. 1 to 4 and has two seven-work double-it magnets (formed
on 40 to 2t 41 M). In the magnetic field, a conductor is provided and a diaphragm (4119) is
disposed. That is, as shown in FIG. 85, a vibrating membrane as shown in FIG. In this
embodiment, a supporting member rod is disposed at each bending portion of the vibrating
membrane rod. Nonmagnetic spacers Mt41 are separated between the magnetic poles I and (6)
and between the magnetic poles and the cheeks, and are joined in series by bringing the yoke
pieces f4 @ It into close contact with each other. Between the magnets (41) and (14) and between
the magnets (-) and (-), pole pieces are located, as is clearly shown in FIGS. In order to have both
the function as the pole piece '52'5alH ball ball and the function as the acoustic lens, the end
surface -A of -10,000 is straight, while the other end surface (e) is hyperbolic It is shaped like a
That is, the width is the narrowest at the center and gradually increases toward both ends. The
pole pieces f + 21591 are sequentially superposed as shown in FIGS. 6 and 8 via magnetic
spacers 1511 as shown in FIG. Further, as shown in FIG. 6 of the magnetic pole piece 54, the
main shaft, that is, the vertically extending vibrating film 2 is inclined downward by about .theta.
The two symmetrical pole piece blocks are tightened by thus arranged pole pieces, through holes
6η of と a 7 and between the through holes of the spacer 四 and the bolt 4 inserted between the
presser plate and the key plate. A cocoon has been formed. Father, since the spacer 1 is not
provided on the part of the pole piece '5' facing the vibrating film 2 ', the thickness of the spacer
wedge is equivalent to that of the pole piece and the pole piece on this part Slits are formed. In
the speaker configured as described above, a magnetic circuit comprising magnet 4 ', pole piece
1655, pole piece 5j, magnet (6) and yoke piece, magnet pole, pole piece 15 force, pole piece 631
2 based on the magnetic circuit consisting of magnet, magnet and yoke piece. l! A magnetic
field is applied to Ji-. If the width of the empty W # is 5 mm, the air gap can be approximately s,
ooo gaussian. If a voice current is applied to the conductor of the diaphragm (4) placed in such a
gap, the imaging / film '41 vibrates based on the principle described in FIGS. Sound is generated.
And f he is dissipated to the outside through a number of slits 1841 acting as a sound path. At
this time, when the sound wave passes through, the traveling direction of the sound wave is bent
downward by the inclination angle θ of the pole piece と き when passing through the inclined
sound wave, and the density of air molecules is increased. And, the pole piece '521 [4] which is
wider than the narrow central part of the two I! l!! In part 2, the molecular density is further
increased and the propagation speed of the sound wave is slightly reduced. That is, when
considering the phase of the sound flux '(d) in FIG. 5, the central portion advances, and both ends
are delayed by 2 and flows to the sound flux 1 (d) with a large width of the pole piece , The wave
front surface is in a state where it is approximated to a spherical surface. When the sound wave
travels through the inclined slit, the air molecules are compressed to the Fll of the pole piece and
the density is increased, and the upper side expands in the opposite direction to create a phase
difference, and the sound flux is reduced. \ EndPage: 3 upper blade is equal, 斤 he spread
between μ roughly horizontal. In this way, an acoustic diffusion lens is constituted by the pole
piece 52 關, ie, pole piece [email protected]@, which is laminated, so that the sound emitted from the
vibrating membrane · 412) h etc. It is distributed and has good acoustic characteristics. !
At ¥ F, due to dimensional constraints of the magnetic pole, a remarkable diffusion effect can be
obtained at a high frequency range of 5 KH2 or more. As apparent from the above, if the speaker
is configured as in the non-embodiment, the vibrating film portion exerts an acoustic lens effect,
so that acoustic conversion with good radiation efficiency can be achieved without providing a
special acoustic lens or diffuser. . Father, the vibrating film: The pole piece located closest to 41
acts as an acoustic lens, so the radiation efficiency is extremely good. Also, in this embodiment, a
vibrating membrane (a magnetic field that is strong over the entire area of the monk can be
applied to the vibration flhgXK. Further, in this embodiment, since the large supporting member
1 配 is disposed at the bending portion of the peristaltic membrane 4B, it is possible to remove
harmonics and remove abnormal noise, and high fidelity reproduction can be performed. .
Although the present invention has been described above based on the embodiments, noninventions are not limited to the above-described embodiments, and can be further modified1.
For example, the magnet f41) 42 or (祷- As shown in FIG. 9, it is possible to use a non-laminated
structure, for example, with the magnet 11 of ii or the aT function.
4. Brief description of the drawings. FIG. 1 is a top view of a conventional bail type 1 speaker,
FIG. 2 is a perspective view showing a part of a moving film, and 8g 3 and FIG. FIG. 5 to FIG. 8
show one embodiment of the invention, wherein FIG. 5 is a plan view of the speaker, and FIG. 6 is
a cross-sectional view of FIG. 2 is a cross-sectional view, FIG. 7 is a plan view of a pole piece and
a spacer, FIG. 8 is a perspective view, and FIG. 9 is a plan view showing a modified example.
41142.4 Reconnaissance ・ ・ ・ Magnet, 姻 ・ ・ ・ Vibrating film, 碕 ... Air gap, I4 ・ ・ ・ ...
Support! # Member, 4 pieces ... spacer, 52 pieces ... pole piece,-1 ... scene 1-... spacer, 61 + @ ...
pole piece block,-64 ... slit. Agent Takano deputy-1 1 Figure 2! Figure 2 Figure 3 EndPage: 4
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