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JPS62265897

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DESCRIPTION JPS62265897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetically shielded speaker used as various audio and visual devices. Prior Art A conventional
loudspeaker of the type described above was constructed as shown in FIG. ??????????
??? ??????? A magnetic circuit portion 4 constituted by the pole piece attached
plate 3 and a frame 11 for shielding the magnetic flux leaking from the magnetic circuit portion
4 to the outside are joined to the bottom portion of the magnetic circuit portion 4 to obtain a
damper 5. Voice coil 6, shooting plate 7. The edge 8, the dust proof 10 and the gasket 9 are
joined at predetermined positions. Problems to be Solved by the Invention In the above-described
conventional configuration, the outer peripheral portion of the magnetic circuit portion 4 is only
covered with the frame 11, so that the shielding effect of the leakage flux can not be sufficiently
satisfied. The shape and size of the damper 6 serving to maintain the center of the voice coil 6 is
limited, and the design freedom (the minimum resonance frequency Cf of the speaker) and the
'Vr pressure frequency characteristic ate' are limited. The reason is that, as illustrated in FIG. 3,
the size of the outer diameter of the damper 5 is determined by the outer diameter of the top
plate 1 to be joined. Means for Solving the Problems In order to solve the above problems, the
present invention connects the center of the bottom of the frame to the top of the magnetic
circuit, and the periphery of the center of the bottom of the frame The entire shield portion is
provided so as to cover the outer periphery and is projected downward, and the outer peripheral
portion of the shield portion is again raised upward to couple the peripheral portion of the
diaphragm. In the above configuration, the magnetic flux leaking from the outer periphery of the
magnetic circuit forms a closed magnetic path with a frame in which the magnetic flux is doubled
around the magnetic circuit, so that the magnetic leakage of the speaker can be reduced and the
attachment surface of the damper is also free. Can be designed. The embodiment of the present
invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the
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present invention, which comprises a ring-shaped top plate 12, a magnet 13 and a plate 14 with
a pole piece. The frame 16 molded in a shape for shielding the magnetic flux leaking from the
magnetic circuit unit 15 to the outside is joined to the magnetic circuit unit 15 to be formed. The
frame 16 has a bottom central portion 16 & connected by welding or the like to the top surface
of the magnetic circuit portion 15, that is, the top surface of the top plate 12 by a magnetic metal
plate such as an iron plate. A shield portion 161) protruding downward so as to cover the outer
periphery of the portion 15 with a predetermined interval is provided, and the shield portion 15i
is constituted by a rising portion 16G rising up.
A gasket 17 and a peripheral portion of an edge 19 of a diaphragm 18 are bonded to the
peripheral portion of the frame 16 by bonding or the like, and a voice coil 20 is coupled to a
central portion of the diaphragm 18. A damper 21 is connected to the frame 21 and the
peripheral edge of the damper 21 is attached to the bottom central portion 16 & of the frame 16.
The lower portion of the voice coil 2o held by the damper 21 in this manner is embedded in the
magnetic gap 22 of the magnetic circuit unit 15 without eccentricity, and the dustproof 23 is
attached to the upper surface of the central portion of the diaphragm 18 There is. With the
above configuration, the outer peripheral portion of the magnetic circuit portion 15 is doubly
covered by the shield portion 161) of the frame 16 and the rising portion 160 of the outer
periphery, and the magnetic flux of the magnetic circuit portion 15 is this shield portion 16b. A
closed magnetic circuit is formed by the rising portion 160 and the magnetic circuit portion 16
so that the magnetic leakage can be remarkably reduced. In another embodiment, as shown in
FIG. 2, the outer periphery of the bottom central portion 162L of the frame 16 is raised upward
to form a sticking portion 16d of the damper 21, and the peripheral portion of the sticking
portion 16d is downward. The shield portion 16b is provided with a rising portion 16G on the
outer periphery of the shield portion 16b, and the shield attaching portion 16d can be configured
to improve the shielding effect of the leakage flux on the upper portion of the magnetic circuit
portion 16 In the above two embodiments, the dimension of the damper 21 can be freely
designed by appropriately selecting the dimension of the bottom central portion 162L or the
diameter of the damper attaching portion 16d. Next, the effect in the Example of this invention is
shown in the following table. (Conditions) и Speaker diameter used: 160 и Magnet: Outer diameter
? 66 ░ thickness 10 t и Leakage magnetic flux measurement location: On the intersection point
of the line with a thickness of magnet 16 c1 n away from the center of the speaker и Leakage flux
shown in the above table Thus, the present invention can reduce the leakage flux by 0.2 G as
compared with the prior art structure, and is shown in FIG. 2 at the bottom central portion 16 &
of the frame 16 coupled to the top plate 12 shown in FIG. By making the damper attaching part
16d of the frame 16 large in the radial direction, the outer diameter of the damper 21 which has
conventionally been limited to the dog pitch of the top plate can be made large, so the degree of
freedom in speaker design can be increased. became. Effects of the Invention As described above,
the speaker of the present invention can make the diameter of the attachment portion of the
damper be dog-like by adding a device to the frame, and the degree of freedom of the speaker
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design can be increased, and further the magnetism The outer peripheral part of the circuit part
will be doubly shielded by the 7 ridges and the rising part of the frame, and the leakage flux from
the magnetic circuit part can be reduced. It is extremely effective as a speaker for the purpose,
and its industrial value is great.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker showing one embodiment of the present invention,
FIG. 2 is a cross-sectional view of another embodiment of the present invention, and FIG. 3 is a
cross-sectional view of a conventional speaker. и и и и Top plate, 13 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и Top plate, 13 и и и Mcnett, 14 и и и и и и и и plate with a pole piece, 15 и и и magnetic circuit portion,
16 и и и и и и и и и и и и и и и и и и и и и и и Bottom surface central portion, 16b иииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Dia. Damper, 22 и и и и magnetic gear tube, 23 и и и и и и и и и dust proof.
Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 2 Figure 3
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