close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2000333282

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 JP2000333282
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a multi-functional sounding body which responds to a plurality of frequency bands
and outputs sound frequency or lower frequency vibration.
[0002]
2. Description of the Related Art A vibration (vibration) which can be sensed in response to an
electrical input at an acoustic frequency of, for example, several hundreds to several kilohertz,
and also to an electrical input at a low frequency of around 10 to 100 Hz. A multi-function
sounding body that also outputs is known. Since this is a single acoustic transducer and can
generate a plurality of types of signals, it is highly effective as a means for downsizing and cost
reduction of devices such as mobile phones. FIG. 4 schematically shows the structure of the
conventional multi-function sounding body.
[0003]
FIG. 4 is a schematic cross-sectional view of a conventional multi-function sounding body in
which the main part has a substantially cylindrical shape, and 1 is a case made of a synthetic
resin and has a substantially cylindrical shape. A diaphragm 2 is for sound output, and the drive
coil 3 is integrated. Reference numeral 4 denotes a magnetic circuit. The yoke 4a, the permanent
17-04-2019
1
magnet 4b, and the pole piece 4c generate a driving magnetic field in the magnetic gap 4d. The
magnetic circuit 4 is coupled to the housing 1 by a support spring 5. An additional mass 4e acts
as a weight for sufficiently lowering the natural frequency, and is included in the mass of the
magnetic circuit 4 to increase the sensitivity of low frequency vibration under the audible range.
The natural frequency of the magnetic circuit is about 10 to 100 Hz. The lower surface of the
housing 1 is fixed to the outer wall or circuit board (not shown) of the small-sized electroacoustic
apparatus.
[0004]
With such a configuration, when a drive current is input to the drive coil 3 from an external
circuit (not shown), an electromagnetic force is generated relative to the magnetic circuit 4. If the
drive current is an acoustic or audio frequency, the magnetic circuit 4 does not respond because
its natural frequency is much lower, and only the diaphragm 2 vibrates to output an acoustic.
However, if the drive current is a low frequency close to the natural frequency of the magnetic
circuit 4, the diaphragm 3 hardly responds, and the magnetic circuit 4 resonates and vibrates in
the axial direction with a large amplitude. Then, in an environment that dislikes sound, or
conversely, in an environment where noise is large and the sound signal is inappropriate, a signal
is generated due to silent and sensational vibration.
[0005]
There has been a single-function sounding body as a speaker or a buzzer which can generate
only an acoustic output and can not generate low-frequency, sensational vibrations, which is an
older technology. In these sound-producing bodies, the magnetic circuit was fixed to the case, but
in the above-mentioned conventional example, since the magnetic circuit is movable to also serve
as the vibrating mass, multi-functionalization is possible. However, a new problem arose for that.
That is, since a magnetic circuit with a large mass is supported by a relatively soft support spring,
when an impact due to a drop or the like is applied to the electronic device equipped with the
sounding body, the heavy magnetic circuit is largely displaced. It causes deformation or breakage
of the housing, the support spring, the coil, the diaphragm, or other parts close to each other. An
object of the present invention is to provide a multi-functional sound generator having impact
resistance.
[0006]
17-04-2019
2
SUMMARY OF THE INVENTION In order to solve this problem, the structure of the multi-function
sounding body of the present invention has the following feature (1). In addition, (2) the
following features may be provided simultaneously.
[0007]
(1) A housing, a diaphragm supported by the housing and vibrating by receiving an
electromagnetic force of an acoustic frequency, and elastically supported by the housing to
constitute a vibration system of relatively low frequency, the diaphragm And a permanent
magnet including a magnetic field for generating the electromagnetic force, and comprising a
relatively large mass magnetic circuit, wherein the diaphragm or the magnetic circuit is mainly
adapted to the electric input of a plurality of frequency bands. In the multi-function sounding
body that vibrates in response to the above, the case and the magnetic circuit are provided with a
motion limiting member that contacts when the relative displacement between the both exceeds
a predetermined value.
[0008]
(2) The motion limiting member provided on the housing side protrudes in the inner
circumferential direction, and the motion limiting member provided on the magnetic circuit side
protrudes in the outer circumferential direction, and any one of them projects the other in the
thickness direction Keeping a gap and being configured to sandwich.
[0009]
(3) The diaphragm and at least a part of the movement limiting member overlap each other.
[0010]
(4) At least one of the movement limiting members is provided with a hole or a notch serving as
an air passage.
[0011]
(5) The casing is composed of two parts overlapping in the thickness direction, and each of the
casings sandwiches the movement limiting member of the magnetic circuit in the thickness
direction as the movement limiting member on the casing side.
[0012]
17-04-2019
3
(6) The movement limiting members on the housing side are arranged in two steps in the
thickness direction and intermittently at angular intervals in the circumferential direction so as
not to overlap each other, and the movement limitation on the magnetic circuit side The
members are also intermittently provided in the circumferential direction with angular intervals,
and are made to overlap each other at different places with the two-stage movement limiting
member on the housing side.
[0013]
(7) The motion limiting members on the magnetic circuit side are arranged in two steps in the
thickness direction and intermittently at angular intervals in the circumferential direction so as
not to overlap each other, and motion limitation on the housing side The members are also
intermittently provided in the circumferential direction with angular intervals, and are made to
overlap each other at different places with the two-stage movement limiting members on the
magnetic circuit side.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of
a multi-function type sounding body which is an example of an embodiment of the present
invention.
Parts that are substantially the same in form and function as those already described with
reference to FIG. 4 are given the same symbols and names, and redundant explanations are
omitted, and different parts will be described.
An upper case 1a and a lower case 1b are stacked and fixed to a housing 1 made of resin, and
each has motion limiting members 1c and 1d projecting inward of a cylindrical main body.
A ring-shaped space having a U-shaped cross-section is formed in the middle of both movement
limiting members.
[0015]
17-04-2019
4
The yoke 4a is integrally formed of a soft magnetic metal material, and has an outwardly
projecting motion limiting member 4f on the outer peripheral portion.
The yoke 4a is not fixed to the housing 1, and is supported by the flat support spring 5 so as not
to touch the housing 1, and can vibrate in the vertical direction (central axis direction).
The periphery of the support spring 5 is fixed to the housing 1.
[0016]
FIG. 3 shows the planar shape.
The support spring 5 is flat, and the inner ring-like portion is welded to the upper surface of the
yoke 4a (not shown), and there are four flexible arms on the outside, and the outer end of each
arm is the housing 1 The upper case 1a is insert molded and fixed.
As a result, the magnetic circuit 4 has a structure in which the housing 1 is caught by a spring.
Further, the outer wall of the yoke 4a has a sufficient radial thickness to increase the mass, so
that the additional mass (conventional example 4e) is omitted.
[0017]
The natural frequency of the magnetic circuit 4 in the vertical direction is substantially
determined mainly by the mass of the magnetic circuit 4 consisting of the sum of the yoke 4a,
the permanent magnet 4b and the pole piece 4c and the spring property of the arm of the
support spring 5. . Therefore, when a low frequency current input close to this natural frequency
is given to the drive coil 3, the magnetic circuit 4 resonates and vibrates with a large amplitude,
and outputs a low frequency vibration that can be felt by the human body.
[0018]
17-04-2019
5
A motion limiting member 4 f on the outer periphery of the yoke 4 a is fitted into the inside of
the ring-shaped space formed in the housing 1. However, in the amplitude which gives a
prescribed vibration output, the interval which does not touch the inner wall is set. However, if
shock or the like is applied and the magnetic circuit 4 is displaced excessively in either direction
with respect to the housing 1, the motion limiting member 4f contacts the motion limiting
member 1c or 1d on the housing side, and the maximum amount of displacement Limited When
the displacement direction of the outermost peripheral part of the U-shaped cross-sectional space
and the cylindrical surface of the root of the movement limiting member 4f are also substantially
cylindrical and the radial direction (lateral direction) of the sounding body is the movement
limitation function Can fulfill.
[0019]
FIG. 2 shows the planar shape of the movement limiting member of the present invention,
wherein (a) is a plan view showing a part of one embodiment cut away and (b) is a plan view of
another embodiment. Each plan view shows only the housing 1 and the yoke 4a, and the other
parts are not shown. In addition, since the motion limiting member of the present invention has a
structure in which the motion limiting members are intricately connected to each other, (1) when
the magnetic circuit produces a vibration output, the air inside the U-shaped cross-sectional
space is the motion limiting member 4f. It is necessary to move around the outer narrow flow
path, causing fluid resistance to the vibration of the yoke, resulting in a problem that the
vibration amplitude is insufficient. (2) There is a problem in assembling the housing and the
yoke. The solution in each Example with respect to these problems is demonstrated below.
[0020]
In the first embodiment shown in FIG. 2 (a), a large number of small holes 4g are opened in the
movement limiting member 4f as a countermeasure for the above (1), and the flow path of air is
increased to avoid an increase in fluid resistance. There is. Although the small holes are provided
only on the yoke side in the drawing, holes may be provided on the facing movement limiting
member on the opposing housing side to further reduce the resistance if air is released to the
outside. The position and shape of the small hole are free, and a large number of notches may be
provided instead of the hole. Further, as a countermeasure of the above (2) for providing the
motion limiting member seamlessly in the entire collection, as already described in the
explanation of FIG. 1, the case is made into a two-body structure of case 1 and case 2 while
sandwiching yoke 4a. I am trying to assemble.
17-04-2019
6
[0021]
Further, in the second embodiment shown in FIG. 2 (b), each motion limiting member is not
provided on the entire circumference but divided by large notches, and the space region where
air is confined is divided into a plurality of sectors. Only the upper part and the lower part were
greatly reduced, and the above (1) was taken as a countermeasure. Of course, small holes may be
further provided on each sector. Further, since the movement restricting members 1c and 1d are
provided so as not to overlap each other, the case 1 is not separated, thereby facilitating integral
injection molding. When the yoke 4a is assembled, the movement limiting member 4f is rotated
by about 22.5 ° (in the case of four sectors) from the position overlapping the movement
limiting member 1d, so that the movement members 1c and 1d overlap in half. After that, the
yoke 4a and a support spring (not shown) are fixed by welding or the like, and the above (2)
measures are taken. Alternatively, the yoke and the support spring may be fixed first, and the
structure may be fitted from the back side of the housing, and then the periphery of the support
spring and the housing may be fixed.
[0022]
Although the embodiments of the present invention have been described above, the present
invention is not limited to the embodiments already described. Various other embodiments can
be obtained by variously changing the basic structure of the sounding body to which the present
invention is applied, the shape structure of the movement limiting member, the shape of the
support spring, etc., or mixing the feature of the components. Is also possible. For example, the
motion limiting members may be provided at different positions or on other members, or at least
one of the motion limiting members may be made of soft material or coated. Further, in the
illustrated embodiment, two motion limiting members are provided on the housing side and one
on the yoke side. However, it is obvious that substantially equivalent configuration and effects
can be obtained even if the number relationship is reversed.
[0023]
(1) In the present invention, since the motion limiting member (stopper) for preventing excessive
displacement of the magnetic circuit is provided, the multi-function sounding body itself may be
damaged at the time of impact, etc. The risk of hurting other parts has decreased dramatically.
[0024]
17-04-2019
7
(2) Further, by providing the motion limiting member on the outer peripheral portion of the
magnetic circuit, thinning is realized.
[0025]
(3) Further, by overlapping with the diaphragm, it was possible to miniaturize without reducing
the sound generation area.
[0026]
(4) By providing holes and notches in the motion limiting member, it was possible to reduce the
air resistance that would disturb the vibration output.
[0027]
(5) In addition, in the configuration in which the other side motion restriction member is
sandwiched between the two housings, there is an effect of facilitating the assembly.
[0028]
(6) Further, in the arrangement in which the two movement limiting members on the housing
side are not overlapped, the housing can be integrally formed.
(7) There is also an effect that the housing can be integrally formed even if the motion limiting
member on the housing side is one sheet and the motion limiting member on the magnetic circuit
side is not overlapped.
17-04-2019
8
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
description, jp2000333282
1/--страниц
Пожаловаться на содержимое документа