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Japan Patent Office Secretary Katayama Ishibe 1, title of the invention 3, patent applicant ■
Japan Patent Office Open Patent Gazette ■ JP-A 51-106 060 published Japan JP 51. (1976)
9.21 Internal reference number 64 /; 555 specification 1, title of the invention 1, title of the
invention 7 open door
8. Detailed Description of the Invention The present invention relates to a loudspeaker. . %
[EndPage 1 loudspeakers of the type comprising an annular magnet having a pole plate formed
with holes in which the pole pieces are positioned so as to form an annular gap for movably
mounting the voice coil . In such a loudspeaker, is it as small as about 1% or less of the electrical
energy input to the voice coil? Only the energy of the lll is converted as useful -i myo energy.
This hoarse energy is transmitted to the cone attached to the voice-coil. The rest of the city
energy is consumed as heat in the voice coil. When heat is consumed by the voice coil, the
temperature of the voice coil rises and shrinks. The commercial energy that can be supplied to
the voice coil is virtually limited. The reason is that in order to maintain safety, the temperature
of the voice coil should not exceed 150 ° C. to 200 ° C. for K. It is not desirable for the
temperature of the voice coil to exceed the temperature range of 150 ° C. to 200 ° C. The
reason is that the resistance of nb copper wire usually used for voice coil has a high temperature
coefficient. For example, if the temperature of the voice coil using a steel wire rises by 150 ° C.,
it decreases by 2 dB. The object of the invention is to reduce the temperature rise of the
loudspeaker for a given power input level by improving the efficiency of heat removal from the
voice coil, where the peristaltic energy input level is very high. Even with the risk of the
loudspeaker becoming inoperable (the mouth 1 can use high input energy while ensuring safety.
It is to provide a loudspeaker. The operating temperature Iv of the voice coil of the loudspeaker
depends on the heat dissipation in the voice coil and the rate at which the heat is removed. Much
of the heat dissipated in the voice coil is removed through the narrow annular air gap formed
between the voice coil and the pole plates of the magnet assembly and between the pole pieces
and into the surrounding air. Dissipation 扛 ゐ. In this way, 1 @ C of the air gap in which the
voice coil is mounted, a large 1 for determining the rate of heat removal from the voice coil!
Element. When the size of the air gap is λ, the temperature difference between the coil and the
magnet assembly also becomes seven in actual shellfish. In accordance with the invention, the
thermal mass between the two surfaces is increased by increasing the effective lIo of the voice
coil's Table 1 button and the magnet assembly's surface orientation.
In the invention V, the voice coil is attached to the voice coil in the town 1, "· · · 法 (磁 (形成 片 片
片 片 片 片 片 片 片 片 片 片 ′ ′ f ' It is modeled from an annular magnet having a disastrous
plate, and at least one non-magnetic extension member having a thickness of the same order as
the thickness of the pole plate and an id in the front F magnetic 1 dumb 11 have been done. The
thickness of the pole plate is preferably smaller than the pressure of the voice coil. The voice-coil
is in fact often made larger than the thickness of the pole plate, especially in bass loudspeakers,
so that the whole bamboo basket transfer 1 of the cone mounted on the voice coil is 01 '. It has
been enlarged. In the nonmagnetic extension member, the magnetic polarity of the air gap is fully
packed 1-The transfer of the heat from the voice coil through the annular air gap to the outer
ring occurs in the seven turns in the table (2) the effective area of the dark Increase. Preferably,
the pole piece comprises a thermally conductive nonmagnetic extension member. On this nonextending extension member. A continuous annular gap is co-operated with the pole piece
extension member so that the total length of the annular gap is at least equal to the total length
of the voice coil or preferably greater than σ. The extension members are provided on both sides
of the pole plate as described above. You voice coil. In contact with the voice coil in good thermal
conductivity, the non-conductive foam non-magnetic wax, which is a thermally conductive nonmagnetic foam, is held by the element-like foamer having a material V-. This further increases the
effective area between the surfaces where heat transfer takes place via the annular gap. The
former and its former 5-f, members, are slit in the vCk direction "to prevent shorting roof
formation during remanent fields which are either acid resistant or f. The length of the former
extension is such that the former and the voice coil have the same overall thickness as the former
extension. Preferably, it is thicker than the thickness of 7 o'clock. EndPage: 2 this invention a, the
following explanation べ る Δ relative to refer to the drawing with a princess will clearly Kf, C.
Fig. 1 會 2) For example, fL-fi ゐ shaped like made of bent iron Barium! A loudspeaker with + is
shown partially. One for each f 永久 of the permanent magnet l! The base 2 made of f @ and the
pole plate 3 are attached. In the central portion of the magnetic pole piece 3, there is formed an
imaginary hole for coaxially receiving a circularly added central magnetic field 4 made of rattan.
The central magnetic pole 4 pole 2 (which has been attached and is formed between the pole
plate 3 and the central pole pole 4 by its nK, n-shaped hollow pIg, 5fr- A circuit is formed.
Voice coil 6 consisting of 9th grade or aluminum bowl is J-shaped! (2) The magnetically nontransfer injection former 7 which has a p% pupil coaxially with that of Chen 5 is used in a contact
state having a good thermal conductivity. The former 7 is made of aluminium, which is made of
aluminum, and the longitudinal direction is to prevent the formation of a loop substantially
outside the residual value of the n711Ii. There is a slit in the The former 7 is freely in the town
W1 in the axial direction within the nine slots 5. The former 7 is corn 8 VC wheat. FIG. 1 only
shows the proportion of coal / NdFA. When the electric signal for secret is supplied to the voice
coil 6 through the lead member (not shown), the coil moves in the axial direction VC # in the
clearance 5 and hence the cone 8 is displaced 1 and the sound is voiced. Occur. In order to
ensure that a portion of the coil 6 is always positioned in the space 5 with respect to the full t + 1
line of the cone 8, the mourning of the coil 6 is more than that of the thickness of the pole plate
3 surrounding rLf. It is getting bigger. In conventional loudspeakers, this limits the surface area
over which heat conduction through the shunt IJ, 5 occurs. In the loudspeaker according to the
present invention, the heat conduction through the gap 5 is enhanced by increasing the surface
area of the heat conductive image forming the gap 5 without completely changing the space of
the magnetic field in the gap 5. It is. That is, in the expansion PB device of the present invention,
the extension ω members 9 and 10 made of nonmagnetic and thermally conductive metal are
such that in this embodiment aluminum forms the void 1yIiiS. The thickness of the extensions y9
and 10 in this embodiment is substantially equal to 3% of the base plate in the case of this
embodiment, for example, an extension with the pole plate 3 of b85- In the P vessel, the
thickness of the eaves members 9 and 10 is 6 u each. The central magnetic pole 4 is provided
with a lamp, and a nonmagnetic gold plate 11 is provided with an extension 11 of aluminum, for
example, to increase the heat conduction surface for forming 4x5). On the other hand, it has a
former 7 carrying a voice roving coil 6 and an axially extending member 12 made of aluminum
or other heat conductive nonmagnetic material. The thickness of the extension aJ2 is greater
than that of the former 7 itself so that it is virtually equivalent to the thickness of the Holo 4
invading material 12 of the former 7 and the voice coil 6. It has become ^ ^. The length of the
former 7 and the thickness of the extension member 9 can be moved to light without being
connected to the cone 8 or the mounting member 9, and can be of a bx size which can be moved.
Pole plate 32 and extension member 9. The full thickness of the pole assembly consisting of lO,
the axial dimension of the voice coil 6 is greater. In this way, the heat conduction through all 1 fis
* is substantially increased, so that the final turn of the voice coil 6 squeezes the pole plate 3 /)
resulting in the conventional loudspeaker: J / J: J The excess force p heat of the final winding
part of il 6 is prevented. EndPage: 3 In FIG. 2, the characteristics of the modest rise to the input
power in the steady state of the voice coil 6 and the magnet assembly are shown. In the figure, A.
B, Cl7j respectively, the characteristic curves of the coils, a, b. Curves A and a respectively show
the characteristic distortions of the magnet constructions, and in the case of a loudspeaker
common to curves A and a Curves B and b are for a loudspeaker with extension members 9 and
10, and curves C and C are In the case of a loudspeaker with the extension members 9, 10 and
the extender material 11'li. The time constant of the temperature change of the voice coil 6 is
generally 2 to 20 seconds, but the time constant of the temperature change of the magnet
assembly is one hour or more. The temperature measurement at each point on the characteristic
curve is performed after a set time of one hour or more. As is apparent from the figure, as the
input coil increases to the temperature of the voice coil 6, as shown in the EIB stock A for a
general loudspeaker, a thick I! For expanders that rise at a constant rate and shoulder extension
members 9 and 10! Material 9 shown in AB. For a loudspeaker with IQ and extension piece 1, it
rises more slowly as shown in curve C. Curves a, b on the temperature rise of the loudspeaker
magnet assembly. As is apparent from C, the power rises linearly as human power increases, but
the curve is slower than the temperature rise of the voice coil 6. This is because the surface area
of the magnet assembly is very large compared to the surface area of the voice coil 60. The
magnet assembly requires that heat be dissipated by conduction and reflux to dissipate the air.
According to the invention, it is possible to reduce the temperature rise of the voice coil by 85
cycles and 45 cycles for a given increase of human power.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the thermal characteristics
of the loudspeaker according to the present invention [FIG. 1] and FIG. Reference Signs List 1
permanent magnet 2 substrate 3 magnetic plate 4 central magnetic pole 5 隋 6 voice coil 7
former 8 cone 8 9.10 ... Josho and the contents of the desk length group material 11 ... 妊長
transgressions material 12 ... former extension member for criminal charges 瑯人 Attorney
Suzuko Takemabayu drawings: 'No change) ladle JEndPage: 45, attachments List of (1) Power of
Attorney 1-1 side no electricity '(2) specification 1 (3) drawing 1 (4 application forms 1 copy t1)
Repair address f'm amount-M1 W1-Hini i +: ; Fi '¥ 6 before nc A group mass address other than
Tokyo, Minato-ku Shibishi Kubo Sakuragawacho 2 17 17 Mori Building 06 (□ ′ ′ “3) nu-h E
** C%,-buki i9 ;,' t ”G'FJr * M Katayama Ishibe: 3 people who make corrections. 5
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