close

Вход

Забыли?

вход по аккаунту

?

JP2007318605

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 JP2007318605
An object of the present invention is to increase the degree of freedom in designing a circuit
board to which a speaker is attached. A diaphragm having a voice coil to be inserted into a
magnetic circuit of a magnetic circuit unit is covered on a frame 2 in which a yoke 9 of the
magnetic circuit unit 1 is fitted in a central through hole. From above, a cap 6 having a sound
emission hole is placed. A terminal 8 electrically connected to the voice coil is provided on the
opposite side of the frame to the cap. The insulator 13 is attached to the exposed portion of the
yoke opposite to the cap, and a back pressure adjusting hole 14 for the diaphragm is formed in
the exposed portion, and the terminal is provided immersible in the back pressure adjusting hole.
Be The speaker can be attached even if the conduction pattern of the circuit board exists
immediately below the yoke. [Selected figure] Figure 2
スピーカ
[0001]
The present application belongs to the technical field of a speaker used, for example, in a small
electronic product.
[0002]
A speaker used in a small electronic device includes a frame holding a magnetic circuit portion in
the center, a diaphragm having a voice coil entering the magnetic circuit of the magnetic circuit
portion, and a cap having a sound output hole. The diaphragm and the cap are sequentially
covered from above the frame and connected to the frame (for example, see Patent Documents 1
and 2).
13-05-2019
1
[0003]
Further, in this type of speaker, the yoke of the magnetic circuit portion is fitted in the central
through hole of the frame, and a terminal electrically connected to the voice coil is provided on
the opposite side of the cap of the frame (for example, See Patent Document 2).
[0004]
In addition, this type of speaker is mounted on the circuit board so that the bottom plate of the
yoke faces the circuit board, and the above-mentioned terminals are applied to a conduction
pattern which is an electrical transmission portion of the circuit board.
When an audio current flows through the conduction pattern of the circuit board and the
terminals to the voice coil of the magnetic circuit unit, the sound from the sound emission hole of
the cap comes out of the cap by vibrating the location from the voice coil to the diaphragm See
Patent Document 2).
[0005]
The yoke and the terminal may be molded separately from the frame and then attached to the
frame, or may be embedded in a resin that forms the frame when the frame is molded and
integrated with the frame (for example, See Patent Document 2).
[0006]
Patent Document 1: Japanese Patent Application Publication No. 2003-134585 Patent Document
2: Japanese Patent Application Publication No. 2004-266424 Utility model registration No.
3119006
[0007]
In the conventional speaker, since the terminal is disposed at a position separated from the yoke
so as not to contact the yoke (see, for example, Patent Documents 1 and 2), the conduction
pattern which is the electrical transmission portion of the circuit board is also below the yoke.
There is no choice but to limit the degree of freedom in circuit board design.
13-05-2019
2
Also, on the other hand, the speaker can not be attached to a circuit board whose conduction
pattern is below the yoke.
[0008]
An example of the subject matter of the present application is to ease the constraints imposed on
the arrangement of the speaker on the circuit board and to increase the degree of freedom in the
design of the circuit board.
In addition, another example of the problem of the present application is to make the terminal
compact under the yoke, to make the speaker compact and to reduce the installation space.
[0009]
In order to solve the above problems, the invention according to claim 1 is a vibration in which a
voice coil entering a magnetic circuit of the magnetic circuit unit is provided in a frame in which
a yoke of the magnetic circuit unit is fitted in a central through hole. A speaker is provided with a
plate, a cap having a sound emission hole from the top of the diaphragm on the frame, and a
terminal electrically connected to the voice coil on the opposite side of the cap from the frame ,
An insulator is attached to the exposed portion of the yoke on the opposite side to the cap, and a
hole for back pressure adjustment to the diaphragm is formed in the exposed portion, and the
hole is formed in the back pressure adjustment hole so as to be immersible. A terminal is
provided.
[0010]
An embodiment of a speaker according to the present application will be described based on the
drawings.
[0011]
Embodiment 1 As shown in FIGS. 1 to 5, this speaker has a vibration having a frame 2 holding
the magnetic circuit unit 1 at the center and a voice coil 3 entering the magnetic circuit of the
magnetic circuit unit 1. It comprises a plate 4 and a cap 6 with a sound release hole 5.
13-05-2019
3
The speaker is assembled by, for example, covering the diaphragm 2 and the cap 6 sequentially
from the top of the frame 2, and the periphery is closed by the peripheral wall.
[0012]
The peripheral wall is formed by an overlapping wall of a standing wall 2a around the frame 2
and a rim wall 6a around a cap 6 covering the standing wall 2a from the outside.
The cap 6 is fixed to the frame 2 by connecting the rim wall 6a to the upstanding wall 2a by an
appropriate connecting means such as adhesion, caulking, or fitting with an adhesive or a
double-sided adhesive tape.
[0013]
The frame 2 is formed, for example, by injection molding of a synthetic resin into a plate having a
substantially rectangular outline.
Of course, the outline of the frame 2 is not limited to a rectangle, but may be a desired shape
such as a circle, an ellipse, or a square.
The upright wall 2a rises from around the frame 2, and a through hole 7 extending in the
longitudinal direction of the frame 2 and penetrating the frame 2 in the thickness direction is
formed at the central portion of the frame 2. Although the through hole 7 is formed in a
substantially elliptical shape in the illustrated example, it may be any other desired shape such as
a circle, a rectangle, or a square.
[0014]
A protrusion 2 b is provided on the back surface of the frame 2, and a pair of terminals 8 made
of a spring material is fixed to the back surface of the frame 2 using the protrusions 2 b. Further,
on the side surface of the standing wall 2a along the long side of the frame 2, a recessed groove
13-05-2019
4
2c for passing a conductive wire described later is formed to correspond to each of the pair of
terminals 8.
[0015]
The pair of terminals 8 is fixed to the back surface of the frame 2 by the respective elongated
base portions 8a being applied to the back surface of the frame 2 along the long side of the
frame 2 and fitted into the protrusions 2b. The pair of terminals 8 project downward from the
base portions 8 a to the lower side of the back surface of the frame 2.
[0016]
The magnetic circuit unit 1 includes a yoke 9, a magnet 10 and a plate 11, and is assembled by
sequentially superposing the magnet 10 and the plate 11 on the yoke 9. Then, the yoke 9 is
inserted into the through hole 7 of the frame 2 from the back surface side of the frame 2 so that
the magnetic circuit unit 1 is assembled and fixed in the frame 2.
[0017]
The yoke 9 comprises a bottom plate 9b applied to the through hole 7 of the frame 2 from the
opposite side of the cap 6, and a convex wall 9a projecting from the periphery of the bottom
plate 9b and inserted and fixed in the through hole 7 of the frame 2. Do. The peripheral edge of
the plate 11 is opposed to the convex wall 9a with a groove. As a result, a magnetic circuit is
constituted by the magnet 10, the yoke 9 and the plate 11, and the lines of magnetic force cross
the groove between the convex wall 9b of the yoke 9 and the periphery of the plate 11.
[0018]
The bottom plate 9 b of the yoke 9 is exposed to the outside of the through hole 7 from the side
opposite to the cap 6, and the insulator 13 is attached to the exposed portion. The insulator 13
can be formed as an insulating film by sticking an insulating film made of, for example, a
synthetic resin on the surface of the bottom plate 9 b or applying an insulating paint.
13-05-2019
5
[0019]
The diaphragm 4 is formed of a resin film or the like in a thin film shape and is covered from
above the frame 2 so as to cover the magnetic circuit portion 1 and fixed by an adhesive or the
like so that the peripheral portion is along the inside of the standing wall 2a of the frame 2 Be
done. Further, a narrow groove is formed in the central portion of the diaphragm 4 so as to enter
the groove of the magnetic circuit unit 1, and the voice coil 3 is embedded in the narrow groove.
Thus, the voice coil 3 is held in the magnetic circuit of the magnetic circuit unit 1. Although not
shown, two wires are drawn out from the voice coil 3 and each wire is electrically connected to
the base 8 a of each terminal 8 on the back surface of the frame 2 through the recessed groove 2
c of the frame 2. When an audio current is supplied to the voice coil 3 from the two conductors,
the diaphragm 4 vibrates on the frame 2 to emit a sound.
[0020]
The cap 6 is formed in a plate shape having a rectangular contour similar to that of the frame 2
by, for example, press forming of a thin metal plate. From around the cap 6, the rim wall 6a
hangs down. Further, at the central portion of the cap 6, the sound release holes 5 of the cap 6
are provided over a plurality of places. Of course, the sound release hole 5 may be provided only
at one place. The rim wall 6 a and the sound release hole 5 are desirably formed simultaneously
with the press forming of the cap 6. The cap 6 is placed on the frame 2 from above the
diaphragm 4 and positioned by the edge of the upright wall 2 a of the frame 2 abutting on the
inner surface of the cap 6. The cap 6 and the frame 2 are fixed so as not to be separated by an
appropriate connecting means such as a double-sided adhesive tape.
[0021]
As shown in FIGS. 5 and 6, in this speaker, a back pressure adjusting hole 14 for the diaphragm 4
is formed in the yoke 9. The back pressure adjusting hole 14 may be provided anywhere on the
yoke 9 as long as the back of the diaphragm 4 can be ventilated to the outside of the frame 2, but
preferably the bottom plate 9b exposed to the outside from the frame 2 Is formed. By providing
the back pressure adjusting hole 14, the back of the diaphragm 4 is conducted to the atmosphere
outside the frame 2 through the back pressure adjusting hole 14, and the diaphragm 4 vibrates
properly.
13-05-2019
6
[0022]
Further, as shown in FIG. 2 and FIG. 3, the back pressure adjusting hole 14 is formed on the short
diameter side of the yoke 9 desirably having an oblong outline. As a result, the magnetic flux is
made uniform over the entire circumference of the magnetic circuit in the magnetic circuit unit
1, and the diaphragm 4 vibrates properly.
[0023]
Further, as shown in FIG. 6, the back pressure adjustment hole 14 is formed so as to straddle the
bottom plate 9 b of the yoke 9 and the convex wall 9 a. Further, as shown in FIG. 7 and FIG. 8,
the terminal 8 is provided immersible in the back pressure adjusting hole 14. Thereby, as shown
in FIG. 5, when the speaker in which the terminal 8 is in the released state is fixed on the circuit
board 15 of the small electronic device as shown in FIG. The terminal 8 is elastically deformed
and the terminal 8 is inserted into the back pressure adjusting hole 14. At this time, the bottom
plate 9 b of the yoke 9 is in contact with the circuit board 15 via the insulator 13.
[0024]
That is, in the conventional speaker, since the terminal is disposed at a position deviated from the
yoke so as not to contact the yoke, the circuit board 15 does not come under the yoke. Therefore,
the place where the conductive pattern 15a is to be arranged is limited to the place shown by the
hatched part other than the corresponding place of the yoke 9 shown by the white part in FIG.
10 (B). On the other hand, in the speaker according to the first embodiment, a notch-shaped back
pressure adjusting hole in which the insulator 13 is attached to the bottom plate 9b of the yoke 9
and the terminals 8 are provided from the bottom plate 9b to the convex wall 9a of the yoke 9 As
shown by hatching in FIG. 10A, the conductive pattern 15a can be disposed at a desired position
over substantially the entire surface of the circuit board 15, and the design freedom of the circuit
board 15 is remarkably enhanced. improves.
[0025]
Next, the operation of the speaker having the above configuration will be described. As shown in
13-05-2019
7
FIG. 7 to FIG. 9, this speaker is disposed and fixed on the circuit board 15 so that its terminal 8
corresponds to the conduction pattern 15a of the circuit board 15. . At this time, the terminal 8
of the speaker is elastically bent and deformed, and is inserted into the back pressure adjusting
hole 14. That is, the terminal 8 of the speaker can also be in contact with the conduction pattern
15 a provided immediately below the yoke 9.
[0026]
After the speaker is incorporated into the circuit board 15, when an audio current is supplied to
the voice coil 3 from the circuit board 15 through the terminal 8, the diaphragm 4 vibrates on
the magnetic circuit portion 1 and the audio is emitted from the cap 6. It is emitted from 5 to the
outside.
[0027]
Second Embodiment As shown in FIGS. 11 to 13, in the speaker according to the second
embodiment, the frame 2 is formed of an injection resin as in the first embodiment. Unlike in this
case, this frame 2 is made by insert molding, with the yoke 9 and the terminals 8 being
integrated with the frame simultaneously with the molding.
This makes it possible to reduce the number of assembling steps of the speaker.
[0028]
The tip end of the terminal 8 is inserted into the back pressure adjusting hole 14 of the yoke 9,
and the injection resin of the frame 2 is removed from the periphery thereof. Thus, the tip of the
terminal 8 can be in close contact with the conductive pattern 15 a of the circuit board 15 by the
elastic force of the terminal 8. If the contact between the terminal 8 and the conductive pattern
15a is insufficient, the conductive pattern 15a side of the circuit board 15 can be formed of a
terminal made of a spring material, if necessary.
[0029]
In addition, in the second embodiment, the same parts as those in the first embodiment are
indicated by the same reference numerals, and duplicate explanations are omitted.
13-05-2019
8
[0030]
Third Embodiment As shown in FIGS. 14 to 18, in the speaker according to the third
embodiment, unlike the case of the first embodiment, the yoke 9 is divided into two, and the gap
provided between the divided pieces is provided. A back pressure adjusting hole 14 is formed.
By dividing the yoke 9 in this manner, the size, shape, and position of the back pressure adjusting
hole 14 can be freely adjusted or adjusted, and the size, shape, and arrangement of the terminal
8 can be appropriately changed. It is. Also, processing of the yoke can be easily performed.
[0031]
In addition, in the third embodiment, the same parts as those in the first embodiment are
indicated by the same reference numerals, and the redundant description will be omitted.
[0032]
The present invention is not limited to the first, second, and third embodiments, and various
modifications can be made within the scope of the present invention.
[0033]
It is the perspective view which looked at the speaker concerning Embodiment 1 of this
application from the cap side.
It is the perspective view which looked at the speaker shown in FIG. 1 from the yoke side.
It is a bottom view of the speaker shown in FIG.1 and FIG.2. It is IV-IV arrow sectional drawing in
FIG. In FIG. 3, it is a V-V arrow arrow sectional drawing. FIG. 6 is an enlarged view of a VI part in
FIG. It is sectional drawing which shows the state which attached the speaker which concerns on
Embodiment 1 of this application to a circuit board corresponding to FIG. FIG. 8 is an enlarged
view of a portion VIII. It is a figure which shows the positional relationship of the speaker and
circuit board which concern on Embodiment 1 of this application. It is a figure which shows the
positional relationship of the yoke of a speaker, and a circuit board, (A) respond | corresponds to
13-05-2019
9
this application, (B) respond | corresponds to a prior art example. It is the perspective view which
looked at the speaker concerning Embodiment 2 of this application from the yoke side. It is a XIIXII arrow directional cross-sectional view in FIG. FIG. 13 is an enlarged view of a part XIII in FIG.
It is the perspective view which looked at the speaker which concerns on Embodiment 3 of this
application from the yoke side. It is a bottom view of the speaker shown in FIG. 15 is a crosssectional view taken along line XVI-XVI in FIG. FIG. 16 is a cross-sectional view taken along line
XVII-XVII in FIG. FIG. 18 is an enlarged view of a portion XVIII in FIG.
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 1 ... Magnetic circuit part 2 ... Frame 3 ... Voice coil 4 ... Diaphragm 5
... Sound emission hole 6 ... Cap 7 ... Through hole 8 ... Terminal 9 ... Yoke 9a ... Convex wall 9b ...
Bottom plate 13 ... Insulator 14 ... Back pressure adjustment Hole for
13-05-2019
10
Документ
Категория
Без категории
Просмотров
0
Размер файла
19 Кб
Теги
jp2007318605
1/--страниц
Пожаловаться на содержимое документа