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Technical Field of the Invention The present invention is an electroacoustic transducer, in
particular, linearity for axial vibration of a diaphragm? The present invention relates to an
electro-acoustic transducer which has an edge portion which is improved as well as an abnormal
imaging motion is less likely to occur. [Prior Art] FIG. 1 is a cross-sectional view showing a typical
speaker as an electro-acoustic transducer, in which (1) is a moving plate, and (2) is a sheet of
cotton cloth or Vl form. , The edge of the diaphragm (1) supported on the frame 4i frame (3), (4)
is a subcone, (5) is a voice coil bobbin, (6) is a damper, (7) is a voice coil, (8) is The top plate, (9)
is a pole piece, (a fence ham magnet. In the case of the upper blue speaker, the edge (2)
supporting the peripheral edge of the moving plate (1) has a great influence on the low FfR
characteristic and high frequency characteristic of the speaker. Therefore, the performance
required for the edge includes good linearity with respect to the axial movement of the
diaphragm (1) and that no division vibration or abnormal resonance occurs. However, since the
shape of the conventional edge (2) is generally asymmetrical in the vertical direction as shown in
FIG. 1, when an alternating current signal is applied to the speaker, the movement of the
diaphragm to the upper side Asymmetry tends to occur in movement. Since the edge (2) also acts
as a diaphragm that radiates sound, if the edge (2) produces split vibration / abnormal
resonance, peak or dip in the response characteristics of the speaker Although the conventional
edge (2) is formed into a sheet-like roll or wave form such as cotton-type or lantern form and is
k-shaped, it is structurally abnormal and easy to generate. The As described above, there is a
problem in the material, shape and structure of the supporting edge fA of the peripheral edge of
the conventional speaker, and the linearity is obtained against the axial movement of the
diaphragm. It has a drawback in that it is difficult to produce the vibration, the division and the
abnormal resonance easily occur, and the response characteristic of the speaker is deteriorated.
SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving
the above-mentioned problems, and the m ′ ′ J) + plate is supported on the frame at its upper
and lower parts with respect to the edge diaphragm. Linearity to axial vibration of the diaphragm
by forming a symmetrical shape of the hollow vibrator with the diaphragm-side elastic body in
the diaphragm side? Improve and cause abnormal vibration to occur (< ll-Captured nausea
acoustic transducer as proposed. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a
cross-sectional view showing a speaker according to an embodiment of the present invention. In
FIG. V, (4) to (00) are the same as the above-mentioned conventional speaker.
エツジ! 21) is an elastic body sound material and is a hollow 'vibrator having a hollow cross
section, a diaphragm (]) and a fleece! It is introverted in a symmetrical structure in the vertical
direction with respect to the junction with the /-(:) I). さらに、エツジ11.! ] The part joined
to the contact plate (1) of l has a notched structure, and the edge (21) of the peripheral edge of
the diaphragm (1)? The structure is such that the diaphragm (1) is supported easily and reliably.
-1: The inner peripheral end of the frame (31) is also easy to join with the edge (21), and the four
parts are shaped [iy] so that the convex part of the outer peripheral part of the edge (21) can be
held completely. There is. Next, the action of the edge according to the present invention will be
described. When an alternating current signal is applied to the speaker in FIG. 2, the diaphragm
(1) is generated in the vertical direction by the driving force generated in the voice coil (7), but
the edge which is a supporting member of the diaphragm (1) Since (21) has a vertically
symmetrical structure as well as a hollow pipe shape in cross section, the state of deformation in
the downward direction with respect to the vibration of the diaphragm (1) is symmetrical, and
the diaphragm (1) is The followability becomes good. Furthermore, the edge (the part to be
connected to the cutting plate (1) for cutting is notched, and the peripheral end of 4 辰
@provisional (1) is held and supported by the vibrating plate (1)) Also, the followability to the
large amplitude in the vertical direction of the diaphragm (1) is improved, and slippage and
twisting do not occur between the diaphragm and the edge, and compliance in the vertical
direction is sufficiently high. it can. For the horizontal movement of the diaphragm (1), the
linearity for vibration with large amplitude in the axial direction of the diaphragm (1) is greatly
improved because it has a very large stiffness. It will turn. In addition, since the cross-sectional
shape of the edge (21) has a ring-shaped three-dimensional structure and is made of an elastic
material as a whole, it is difficult to cause division (osculation or resonance phenomenon) in the
edge portion (21). In addition to good performance of the speaker and the response
characteristics of the 15 because of the force performance as follows, distortion is also
significantly reduced. FIG. 3 shows another embodiment of the present invention, and is a
sectional view of only the edge portion? It shows. In this embodiment, the edge (22) can be fully
utilized at the portion where the frame (3'll) is joined, and at the same time, the inner peripheral
end face of the frame joined with the edge I2 thirst can be provided with all the projections. . The
operation of the vibrating yarn is substantially the same as that of the above embodiment, but
the edge (22) is more easily and reliably retained in the frame.
FIG. 4 shows still another embodiment of the present invention, and is a sectional view of only
the edge portion? It shows. In this' J embodiment, the lower surface of the notch of the edge (23)
joined to the peripheral end of the diaphragm (1) is bent to the inside of the hollow pipe to form
a bent portion (-1 this bent portion and 1 It is made to join all the gutters of l + ld + tyu (1). The
operation of the image pickup system ((7) is substantially the same as in the first embodiment,
but the diaphragm (1) is more reliably and stably supported by the edge (23). In each of the
above-described embodiments, the cross-sectional shape of the edge is generally circular, but the
effect is 1- even if it is round or rhombus. Although the edges of the flat plate speaker are
illustrated in each of the above-described examples, it is not said that the same can be applied to
a cone-shaped or dome-shaped speaker as well. According to the present invention, as described
above, the material of the edge of the electro-acoustic transducer is made of an elastic material,
and the structure thereof is a pair of hollow pipes of vibration temporary (---heat symmetrical
outer shape; As a result, the 1α glandularity with respect to the axial movement of the scanning
plate is significantly improved, and an abnormal differential is less likely to occur, and the
electroacoustic transducer is used because it is sandwiched by the diaphragm edge. There is an
effect that the followability of the
Brief description of the drawings
FIG. 1 is a sectional view showing a conventional speaker, FIG. 2 is a sectional view showing an
embodiment of the present invention, and FIG. 6 is a partial sectional view showing a part of a
second field case of the present invention, FIG. FIG. 8 is a partial cross-sectional view showing a
part of a third embodiment of the present invention.
(1)-· · diaphragm, (2), (2 + 1. tl,! 2+, CJ □□□ ··· Edge, (3), (31), L3 Force, (33) ··· V- Frame, (4) ···
Subcone, (5)-··· Voice coil bobbin, (6) ... Damper, (7) ... Voice coil, () 11 ... Top plate, (9) ... Hall
piece, (10 ... Magnet. In the drawings, the same reference numerals indicate the same or
corresponding parts. Agent Patent Attorney Shiro Kimura