close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2004015574

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2004015574
An electro-acoustic transducer capable of obtaining sufficient characteristics even when shared
between a receiver and a speaker. A yoke (2) fixed to a frame (1) has a cylindrical portion (2a)
integrally formed on a disc-shaped bottom plate, and has a substantially convex half-section. The
ring-shaped first magnet 3 is joined to the outer peripheral portion of the yoke 2 and the discshaped second magnet 4 is joined to the central portion, the first top plate 5 is formed on the
upper surface of the first magnet 3 and the upper surface of the second magnet 4 The second
top plate 6 is joined. A first magnetic circuit passing from the first magnet 3 to the first top plate
5 → the first magnetic gap g1 → the cylindrical portion 2a → the first magnet 3 is formed by the
second magnet 4 and the second top plate 6 → the second magnet. A second magnetic circuit
passing from the gap g2 to the cylindrical portion 2a to the second magnet 4 is formed. The first
coil 8 and the second coil 9 are bonded and fixed to the lower surface of the diaphragm 7, and
the winding terminals 8a and 9a are joined by solder 12 on the terminal pattern 11a of the lower
surface through the side of the frame 1 There is. [Selected figure] Figure 1
Electro-acoustic transducer
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer used for a speaker or receiver of a mobile phone or the like. 2.
Description of the Related Art In recent years, as an electroacoustic transducer of a mobile
communication device such as a portable telephone, there are one for a receiver used by pressing
against the ear and one for a speaker used away from the ear. . In the case of a mobile phone,
there are cases where one electro-acoustic transducer is shared and one dedicated electroacoustic transducer is separately used to fulfill these two functions. And, in any case, a thin
speaker with good performance is required. An example of such a conventional electroacoustic
transducer will be described based on the drawings. Fig. 3 (b) is a bottom view of the
12-04-2019
1
conventional electrodynamic speaker, and Fig. 3 (a) is a cross-sectional view taken along the line
B-B in Fig. 3 (b). First, the configuration of this speaker will be described. In FIG. 3, reference
numeral 51 denotes an annular case of a resin molded product, which has an inner
circumferential step portion 51a and an intermediate step portion 51b. Reference numeral 52
denotes a pot-shaped yoke made of a magnetic material embedded in the inner periphery of the
case 51. 53 is a disk-shaped permanent magnet fixed at the center of the inner surface of the
yoke 52 and magnetized in the vertical direction, and 54 is a disk-shaped top plate fixed to the
upper surface of the permanent magnet 53. A permanent magnet 53 forms a magnetic circuit
through a magnetic gap which is a gap between the upper end of the yoke 52 and the outer
periphery of the top plate 54. Reference numeral 55 denotes a substantially spherical diaphragm
integrally formed of a plastic material having a flat portion 55a near the periphery and a curved
portion following the flat portion, and the periphery is flat and the middle of the frame 51 is flat.
It is adhesively fixed to the step 51b. 56 is a voice coil which is a cylindrical air core coil formed
by aligning and winding a coil winding which is an enamel coated copper wire in a rectangular
cross section, and its upper surface is adhered to the lower surface of the flat portion 55 a of the
diaphragm 55 It is fixed. The voice coil 56 is inserted into the magnetic gap to a depth
approximately half the coil length. Denoted at 57 is a protector made of a light metal or the like
for protecting the diaphragm 55, and its peripheral portion is fixed on the diaphragm 55 of the
intermediate step portion 51b of the frame 51. The frame 1 and the protector 57 are each
provided with a plurality of sound output holes. Reference numeral 58 denotes a glass-containing
epoxy resin substrate or the like disposed on the lower surface of the case 51, and is provided
with a pair of V-shaped terminal patterns 58a. The reference numeral 59 denotes solder that
joins the winding end 56a of the voice coil 56 guided along the lower surface of the diaphragm
55 through the groove provided on the side surface of the frame 51 to one branch of the
terminal pattern 58a. .
The other branch is a connection terminal when the speaker is incorporated into the device.
When an audio signal is applied to the voice coil 56 of this speaker, the voice coil 56 is driven by
interaction with the magnetic circuit according to Fleming's left-hand rule, and the diaphragm 55
vibrates up and down to generate sound. Emits Incidentally, although a special speaker for mania
that reproduces a complicated vibration mode by fixing a plurality of voice coils to a single
diaphragm and using a plurality of magnets has conventionally been present, a plurality of coils
There was nothing to switch the input signal to. Further, Japanese Patent Application Laid-Open
No. 11-252683 discloses that one diaphragm is provided with two voice coils for one magnetic
circuit. SUMMARY OF THE INVENTION However, in the conventional speaker having such a
configuration, since one diaphragm and one voice coil are used, the speaker and the speaker are
shared. In the case where each of the required characteristics is different, either one of the
characteristics must be emphasized, or both of the characteristics must be compromised, and in
either case sufficient characteristics have not been obtained. . That is, when emphasis is placed
on the characteristics of the receiver (resonance frequency 300 to 500 Hz), a thin diaphragm
12-04-2019
2
(approximately 10 μm thick) will be used, so it can not withstand the input power when used for
a speaker, and the bass range An abnormal sound is generated in this case. In this case, in order
to prevent abnormal noise, it is necessary to cut off a signal in a lower band from a certain
frequency in a circuit. In addition, when emphasis is placed on a speaker (resonant frequency
600 to 800 Hz), since the resonant frequency is relatively high, the circuit does not conform to
the receiver standard, so it has been necessary to perform circuit correction. In addition, when
two diaphragms are used, it is difficult to make the electroacoustic transducer thin. The present
invention has been made to solve such conventional problems, and an object thereof is to provide
an electroacoustic transducer which can obtain sufficient characteristics even if it is shared by a
receiver and a speaker. is there. The means of the present invention for achieving the above
object comprises a permanent magnet, a yoke fixed to one of the magnetic poles of the magnet,
and a top plate fixed to the other magnetic pole. In the electro-acoustic transducer in which a
magnetic circuit is formed and the diaphragm is driven by the interaction between the magnetic
circuit and a voice coil fixed to the diaphragm, one voice coil is used as the voice coil. The first
coil is fixed on the outer side, the second coil is fixed on the inner side, and a pair of terminal
patterns connecting each winding end of the coils are provided, and a signal current is selectively
applied to the coils. It is characterized by being able to do it.
Further, the half cross section of the yoke has a substantially convex shape, and the permanent
magnet is a ring-shaped first magnet joined to the outside of the protrusion of the yoke, and a
disk-like joined to the center of the yoke. And an annular first top plate on the first magnet, and a
disc-like second top plate on the second magnet, and the convex of the yoke It is characterized in
that the first coil is made to face the first magnetic gap formed outside the part, and the second
coil is made to face the second magnetic gap formed inside the convex part of the yoke. Further,
a half cross section of the yoke has a substantially concave shape, and it is formed between the
yoke and an annular top plate joined on a ring-shaped magnet disposed in the concave groove of
the yoke. It is characterized in that the first coil and the second coil are respectively exposed to
the first magnetic gap outside and the second magnetic gap inside. BEST MODE FOR CARRYING
OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in
detail based on the drawings. FIG. 1 is a bottom view of an electroacoustic transducer according
to a first embodiment of the present invention, and FIG. 1A is a cross-sectional view taken along
the line A-A of FIG. FIG. 2 is a cross-sectional view of an electroacoustic transducer according to a
second embodiment of the present invention. First, the configuration of an electroacoustic
transducer according to an embodiment of the present invention will be described. In FIG. 1,
reference numeral 1 denotes a frame which is an annular resin molded product, and a yoke
described later is embedded in a central hole. A stepped portion 1a is formed on the outer
periphery of the frame 1, and a plurality of sound emission holes are formed on the inner side
thereof. A magnetic yoke 2 is embedded in the frame 1, and a cylindrical portion 2a to be a
convex portion is integrally formed on a circular bottom plate, and a half cross section (half of a
cross section passing through the center) has a substantially convex shape. It is The first magnet
12-04-2019
3
3 is a ring-shaped permanent magnet magnetized in the vertical direction, and is joined to the
yoke 2 outside the cylindrical portion 2a. A second magnet 4 is a disk-like permanent magnet
magnetized in the vertical direction, and is joined to the center of the yoke 2. Reference numeral
5 is a first top plate of an annular magnetic body adhered to the upper surface of the first
magnet 3, and 6 is a second top plate of a disk-shaped magnetic body joined to the upper surface
of the second magnet 4. . The first magnetic circuit passing from the first top plate 5 → the
cylindrical portion 2a → the bottom surface of the yoke 2 → the first magnet 3 by the first
magnet 3 and the second magnet 4 by the second magnet 4 the second top plate 6 → the
cylindrical portion 2a → yoke A second magnetic circuit passing from the second bottom surface
to the second magnet 4 is formed.
A first magnetic gap g1 and a second magnetic gap g2 are formed between the cylindrical
portion 2a and the first top plate 5, and between the cylindrical portion 2a and the second top
plate 6. Reference numeral 7 denotes a diaphragm of a resin molded product whose outer
peripheral edge is adhered and fixed to the stepped portion 1a of the frame 1, and annular flat
portions 7a and 7b at positions of the first magnetic gap g1 and the second magnetic gap g2. Is
formed. The first and second coils of the voice coil, which are cylindrical air-core coils, are
formed by aligning and winding a coil winding, which is an enamel coated copper wire, in a
rectangular shape in cross section and solidifying it with a paint. The first coil 8 is adhered and
fixed to the lower surface of the plane portion 7a, and the second coil 9 is fixed to the lower
surface of the plane portion 7b. The winding terminals 8 a and 9 a of the first coil 8 and the
second coil 9 are the outer periphery of the frame 1 along the lower and upper surfaces of the
diaphragm 7 from the upper end of the first coil 8 and the second coil 9 respectively. Are drawn
towards. Reference numeral 10 denotes a protector made of a light metal or the like with a sound
output hole for preventing damage to the diaphragm 7 adhesively fixed to the diaphragm 7 of
the stepped portion 1a of the frame 1. 11 is a pair of fan-shaped substrates on which the
terminal patterns 11a are formed. The winding terminals 8a and 9a of the first coil 8 and the
second coil 9 are guided to the lower surface of the frame 1 through the groove portions on the
side surface of the frame 1, and fixed with solder 12 on each pair of terminal patterns 11a. Next,
the operation and effect of the embodiment of the present invention will be described. The
electro-acoustic transducer is provided with two voice coils and terminal patterns corresponding
thereto, and the signal current is applied to the terminal pattern 11a of the second coil 9 on the
inner side for the receiver or for voice such as hands free. The signal current is applied to the
terminal patterns 11 of the outer first coil 8 or the voice coil of both the first coil 8 and the
second coil 9 for a speaker such as melody. By selectively driving the two coils in this manner, in
the case of a receiver, the area of the diaphragm 7 outside the second coil 9 can be increased, so
that the rigidity of the diaphragm is softened and the resonance frequency is reduced. It can be
lowered. On the other hand, in the case of a speaker such as a melody, the first coil 8 with a large
diameter of the voice coil on the outside can be used, and the sound pressure becomes large. This
is because the driving force F to the diaphragm 7 is proportional to the effective wire length L of
12-04-2019
4
the coil (driving force F = magnetic force B · coil effective wire length L · current I). Therefore,
even if one electroacoustic transducer is shared, it is possible to exhibit sufficiently good
characteristics in each application by selectively driving the two coils.
Generally, the receiver is mainly φ10 mm in Japan (voice coil diameter: about φ5 mm) and φ13
mm overseas (voice coil diameter: about φ6.5 mm). The characteristics can be secured without
losing the performance. Further, in the present structure, since the resonance frequency can be
lowered without using a thin diaphragm, the thickness of the diaphragm can be selected with
emphasis on the speaker, so that abnormal sound in the low frequency range can be avoided.
Next, a second embodiment of the present invention will be described. FIG. 2 is a cross-sectional
view of an electroacoustic transducer according to a second embodiment of the present
invention. The bottom view is omitted because it is the same as that of the first embodiment
shown in FIG. In FIG. 2, the electro-acoustic transducer of the first embodiment is different from
the electro-acoustic transducer of the first embodiment only in the configuration of the magnetic
circuit unit. Explain only. Reference numeral 12 denotes a yoke, which has a disk shape having a
ring-shaped recessed groove between the central portion 12a and the outer wall portion 12b.
That is, the half cross section is substantially concave. Reference numeral 14 is a ring-shaped
permanent magnet joined to the center of the recessed groove. An annular top plate 16 is bonded
onto the magnet 14. Top surfaces of the top plate 16 and the yoke 12 are at substantially the
same height, and a first magnetic gap g1 and a second magnetic gap g2 are formed between the
top plate 16 and the outer wall 12b and the central portion 12a of the yoke 12, respectively. ing.
The first magnetic circuit passing through the top plate 16 → the first magnetic gap g 1 → the
outer wall 12 b → the magnet 14 by one magnet 14 and the top plate 16 → the second magnetic
gap g 2 → the first passing the central portion 12 a → the magnet 14 Two magnetic circuits are
formed. The first coil 8 and the second coil 9 are disposed to face the two magnetic gaps g1 and
g2, respectively. Next, the operation and effect of the second embodiment will be described. The
two voice coils of the first coil 8 and the second coil 9 are fixed to one diaphragm 7, and each
winding terminal is connected to an independent terminal pattern. Signal current can be
selectively supplied to the coil or both coils to vibrate the diaphragm 7 in different modes. Since
only one magnet and one top plate are used, the number of parts is small and the cost can be
reduced. Other effects similar to those obtained in the first embodiment can be obtained.
As described above, according to the present invention, according to the present invention, a
permanent magnet, a yoke fixed to one magnetic pole side of the permanent magnet, a top plate
fixed to the other magnetic pole side, and In an electroacoustic transducer comprising a frame in
which a yoke is embedded, a diaphragm fixed to the frame, and a voice coil fixed to the
diaphragm, two voice coils are fixed to one diaphragm. Since the winding terminals of the voice
coil are connected to terminal patterns provided independently of each other to selectively drive
the voice coils, one electro-acoustic transducer is used for a receiver or a speaker Even if it is
12-04-2019
5
shared, it can exhibit sufficiently good characteristics in each application. BRIEF DESCRIPTION
OF THE DRAWINGS FIG. 1A is a cross-sectional view of an electroacoustic transducer according
to a first embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view of an
electroacoustic transducer according to a second embodiment of the present invention. 3A is a
cross-sectional view of a conventional electroacoustic transducer, and FIG. 3B is a bottom view
thereof. [Description of the code] 1 frame 2 yoke 2a cylindrical portion (convex portion) 3 first
magnet 4 second magnet 5 first top plate 6 second top plate 7 diaphragm 8 first coil 9 second
coil 8a, 9a winding Terminal 11a terminal pattern g1 first gap g2 second magnetic gap 12a
central part 12b outer wall part 14 magnet 16 top plate
12-04-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
description, jp2004015574
1/--страниц
Пожаловаться на содержимое документа