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JPS5529875

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DESCRIPTION JPS5529875
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a
conventional cone type speaker. FIG. 2 is a view showing a typical frequency-time example of a
conventional speaker and a frequency characteristic example of the speaker of the present
invention. FIG. 3 is a longitudinal sectional view showing an embodiment of the speaker
according to the present invention, FIGS. 4A and 4B are sectional views showing an equalizer
used in the present invention, and FIG. 5 is another embodiment of the present invention It is a
longitudinal cross-sectional view which shows. 20 ...... speaker, 21.43 ...... magnets, 22.40 ...... pole
pieces, 24.38 ...... magnetic circuit, 32 ... · · · · · Speaker body portion 31 · · · · · · · · dome dome
diaphragm, 34. 42 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · inside the through hole Circumference,
22a. 21a, 23a, 40a, 43a, 44a ..... vents.
DETAILED DESCRIPTION OF THE INVENTION The present invention proposes a speaker
provided with a dome-shaped diaphragm in the speaker main body, in particular, a speaker
intended to improve the frequency characteristics of the speaker. It is a futuristic thing. In
general, for example, as shown in FIG. 1, for example, a cone-shaped speaker has a magnetic
circuit portion 4 composed of a magnet 1, a pole piece 2 and a yoke 3 for producing a radial
uniform and strong magnetic field in an annular canon. A voice coil 5 which is cast in the air gap
of the circuit unit 4 and generates a force proportional to the audio current, and a cone-shaped
diaphragm 6 for transmitting the mechanical image pickup action of the whistling coil 5 by air
current. Guggbuff 7 for holding the voice coil 5 at the center of the gap, vibration part parts,
magnetic circuit and pond parts -i mounting frame 8, cask oto 9, enone 10 and in the frame 8, L ·
· The speaker main body 12 and the like are composed of a dome-shaped diaphragm 11 called a
center cannog mounted on the speaker. By the way, although the dome-shaped diaphragm 11
used for the speaker which has such a structure also has the function of dustproof etc. in one, the
cone-shaped diaphragm 6 vibrates according to the audio | voice current Then, along with the
vibration, the dome-shaped diaphragm 11 is also moved. Therefore, in the cavity 13 surrounded
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by the 2-dome diaphragm 11 and the Heus coil 5 and the pole piece 2 of the magnetic circuit
unit 4, the vibration of the dome-shaped moving plate 11 itself causes the inside of the cavity 13
to Air is shrunk and air column resonance occurs. Alternatively, since the volume of the L-shaped
cavity portion 11 is relatively small, the inside thereof becomes a very high sounding king, and
this causes the phenomenon of radiation of sound from the dome-shaped diaphragm 11 and
hence the front surface of the speaker The sound was also emitted in the direction of the club,
which caused the deterioration of the sound quality and the deterioration of the number
characteristic. Therefore, conventionally, as shown in FIG. 1, air holes 2a, 1a and 3d are formed
in the central portions of the magnetic circuit portion 40 hole piece 2, the magnet 1 and the yaw
3, and Loudspeakers have been proposed in which the sound pressure is communicated with the
atmosphere to reduce the sound pressure as much as possible. However, even in such a speaker,
there is no sufficient effect to prevent air column resonance in the unoccupied cavity 13 and an
adverse effect due to the back use of the dome-shaped diaphragm 11, and furthermore, in the
cavity 13. Since the generated sound pressure is rapidly supplied into the aeration [12a, 1a, 3a
having a relatively small open 3-mouth portion, a sound discontinuity occurs, so that part of the
sound wave is conversely dome-shaped diaphragm 11 May be emitted to the side.
Therefore, there is a drawback that at some frequencies their reflections strengthen each other,
or at other frequencies% W +,->-C, fi, i42 啜 ゎ, ゎ よ 山 山Huh. Recently, in order to eliminate
such a defect, a speaker has been proposed in which the sound absorbing material 14 is filled in
the sound recording cavity 13 to remove the adverse effect from the back pressure of the domeshaped vibrating reed 11. However, a speaker has been proposed to remove the adverse effect
from the back pressure in the cavity 13. However, the absorbing material 14 itself vibrates under
the influence of the back pressure in the cavity 13, and as a result, the sound absorbing material
At 14 the load mass was in the form of increased and therefore acoustically inadequate. This
invention is more than this work! It has been developed and proposed to eliminate the following
disadvantages. Hereinafter, an embodiment of the present invention will be described based on
the drawings. = 1 = Figure 3 shows a preferred embodiment of the cone type loudspeaker
according to the present invention. In the figure, reference numeral 20 denotes a cone type
speaker, and this speaker 20 is a magnetic circuit unit consisting of a magnet 21, a pole piece 22
and a yoke 23 for producing a radial uniform and strong magnetic field in an annular gear knob.
And a voice coil 25 disposed in the air gap of the circuit section 24 and generating a force
proportional to the voice current; and a Kono-like diaphragm 26 for transmitting mechanical
vibration due to the voice current of the voice coil 25 to air. And, in order to hold the voice coil
25 at the center of the gear knob ○ Damper 27 and parts of the vibration part, frame 28 for
attaching the magnetic circuit and other parts, casknot 29, edge 30 and the center of the frame
100 The speaker main body 32 and the like are composed of a dome-shaped diaphragm 31
mounted on the main body. In each of the central portions of the pole piece 22 for forming
magnetic poles and for guiding the magnetic flux generated from the magnet 21 to the gear knob
(magnetic air gap) among the magnetic circuit portion 24 L, 5-domes are provided at each
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central portion. Air holes 22a, 21a and 23a are formed for releasing compressed and compressed
air generated in the hollow portion 32 surrounded by the diaphragm 31, voice coil 25 and pole
piece 22 into the atmosphere. Each air vent 22a, 21a and 23a is filled with a damping material
(sound absorbing material) such as urethane so that the entire control of the acoustic load can be
performed. In this example, the damping material 33 is filled in the air hole 23a formed in the
central portion of the yaw 23. Next, in the figure, 34 denotes an equalizer formed of a material
such as glass, felt, urethane, metal, etc. to form the pole piece 22 constituting the magnetic
circuit portion 24, the voice coil 25 and the speaker main portion 32. The diaphragm 31 is
disposed in a quadruple cavity 32.
The equalizer 34 is generally formed in a generally toroidal shape, and is provided with a
cylindrical through hole 35 at a central portion. The inner peripheral diameter of one end portion
of the through hole 35 on the pole piece 22 side is formed to have substantially the same size as
the inner peripheral diameter of the vent hole 22 a of the pole piece 22. Accordingly, the inner
circumferential surface 36 of the through hole 35 and the inner circumferential surface of the
vent hole 22a are continuous with each other. Inner circumferential diameter of the other end
portion of the dome shaped diaphragm 31 side of the through hole 35 formed in the sharp
equalizer 34! , Is larger than the inner circumferential diameter of the vent hole 22a of the hole
piece 22 and indicated by the broken line, the outer circumferential diameter of the equalizer No.
3! It is formed smaller than or equal to 3. Then, from the one end portion on the side of the pole
piece 22 having the above inner circumferential diameter j1 よ う, the inner circumferential
diameter! . The shape of the inner circumferential surface 36 of the through hole 35 of the
equalizer 34 is formed so as to gradually expand as the direction of the other end portion on the
diaphragm 31 side having the angle of 1 is directed. That is, the inner circumferential surface 36
of the through hole 35 of the equalizer 34 has a ho / shape. Therefore, the space formed in the
through hole 35 from the other end of the equalizer 34 on the side of the diaphragm 31
gradually narrows the space as it goes to the pole piece 22 side. The equalizer 34 is fixed to the L
surface of the pole piece 22 by an adhesive or the like. Therefore, the equalizer 34 itself is not
moved by the sound pressure in the 7-cavity 32. 4A-B show another modification of the
equalizer, and FIG. 4A is an equalizer formed so that the shape of the inner peripheral surface
36a of the through hole 35a does not greatly expand as it goes to the upper end portion. FIG. 4B
shows an equalizer 34b in which the shape of the inner peripheral surface 36b of the through
hole 35b is formed so that the end portion of the through hole 35b opens sharply and sharply.
As described above, although the loudspeaker of the present invention is configured, since the
equalizer 34 is thus inserted and disposed in the hollow portion 32, the volume of air in the
equalizer 340 volume integral hollow portion 32 is reduced. Thus, it is possible to prevent air
column pregnancy occurring in the cavity 32. Further, the inner circumferential diameter of the
other end of the diaphragm 31 side of the equalizer 340 through hole 35 disposed in the hollow
portion 32! Since the diaphragm 31 is formed so as to have a large opening, the air I shrunk in
the cavity 32 by the diaphragm 31, in particular, the pressure node and the air trapped near the
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top of the diaphragm 31 can be easily penetrated through 358-T can be distributed deep inside.
Further, the shape of the inner peripheral surface 36 of the through hole 35 of the equalizer 34
is formed so as to gradually narrow as it goes to the pole piece 22 side, and the inner peripheral
surface 36 of the through hole 35 and the pole piece 22 Since it is formed to be continuous with
the inner peripheral surface of the vent hole 22a, the back pressure of the diaphragm 31 can be
continuously and smoothly released to the atmosphere, and hence the resonance phenomenon
occurring in the empty J11 portion 32 It can be extremely reduced. Therefore, as shown by the
solid line a in FIG. 2 showing the frequency characteristic when the conventional speaker is used,
a sharp peak and valley is produced on the frequency characteristic, and a good reproduction
frequency characteristic as shown by the broken line in the same figure. It can be secured.
Further, since the shape of the through hole 35 of the equalizer 34 is formed so as to gradually
decrease toward the pole piece 22 side, the magnet 21 is provided at the position of the pole
piece 22 位置 1 as shown in FIG. Loudspeaker employing a so-called internal magnetic type
magnetic circuit unit, a loudspeaker employing a so-called external magnetic type magnetic
circuit unit in which a center pole is disposed at the center -9-center and magnets are disposed at
the left and right ends thereof It is also possible to apply to Next, FIG. 5 shows another
embodiment of the present invention and shows an example in which the present invention is
used for a dome-shaped speaker. That is, in the hollow portion 41 surrounded by the three
members of the dome-shaped diaphragm 37 and the voice coil 39 and the pole piece 40
constituting the magnetic circuit portion 38, the equalizer 42 having the same shape as the
equalizer 34 described above is The air holes 40a, 43a and 44ai are formed in the central portion
of the interposing arrangement h, the pole piece 40 ° magnet 43, and the yaw 44. In the figure,
45 is a sound absorbing material. Even with the dome-shaped speaker having the abovedescribed configuration, the resonance phenomenon generated in the cavity 41 can be minimized
as in the above embodiment, and the sound pressure generated in the cavity 41 can be
transmitted without difficulty. It can be released to the atmosphere through the pores 40a, 43.1
and 44a. As is apparent from the above description, according to the present invention, the
equalizer is provided in the hollow portion surrounded by the dome-shaped diaphragm and the
voice coil and the pole piece constituting the magnetic circuit portion, so that it occurs in the
inside. The air column resonance can be prevented, and the shape of the through hole of the
equalizer is formed so as to gradually narrow as the pole piece 1111 V is directed, while the pole
piece is dispelled by the inner circumferential surface of this through hole And so on, so that the
sound pressure generated in the empty jll · 1 part can be released smoothly into the atmosphere
without unreasonableness, thus a good reproduction frequency characteristic with little
distortion Have the effect of obtaining
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