close

Вход

Забыли?

вход по аккаунту

JP2002320919

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 JP2002320919
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer with a vibration function and a method of manufacturing the same.
[0002]
2. Description of the Related Art A conventional electroacoustic transducer with a vibration
function will be described with reference to FIG. 5 (a) is a top view, and FIG. 5 (b) is a crosssectional view.
[0003]
According to the figure, 10 is a diaphragm, 10a is a voice coil fixed to the diaphragm 10, 11 is a
magnetic circuit, and a magnetic circuit body 11a for generating a driving force when current
flows through the voice coil 10a and The weight portion 11b is integrally coupled to the
magnetic circuit main body 11a, and is added to touch the vibration of the vibration portion 13
described later, which is not substantially a magnetic circuit. The weight portion 11b may not be
added if vibration can be sufficiently obtained.
[0004]
13-05-2019
1
Reference numeral 12 denotes a suspension for supporting the magnetic circuit body 11 a and
the weight portion 11 b on the frame 16.
Reference numeral 13 denotes a vibration unit constituted by the above-described magnetic
circuit 11 and the suspension 12. The diaphragm 10 and the voice coil 10a constitute a
mechanical resonance circuit of an acoustic unit. The magnetic circuit 11 and the suspension 12
constitute a mechanical resonance circuit of the vibration unit 13.
[0005]
The weight portion 11 b is a resin molded product in which tantalum powder is mixed, and the
suspension 12 and the magnetic circuit main body 11 a are also integrated by insert molding.
[0006]
Reference numeral 17 denotes a baffle attached to the frame 16 as well as adhesively bonding
the peripheral edge of the diaphragm 10.
[0007]
The operation of the vibration function-equipped electro-acoustic transducer configured as
described above will be described.
[0008]
Since the voice coil 10a is disposed in the magnetic gap A of the magnetic circuit body 11a, when
an alternating current flows through the voice coil 10a, a driving force corresponding to the
current is generated in the vertical direction of the voice coil 10a.
Although this driving force acts between the voice coil 10a and the magnetic circuit body 11a,
since the voice coil 10a is designed to be very light compared to the magnetic circuit 11, the
magnetic circuit 11 does not vibrate at most frequencies. The voice coil 10a vibrates.
For this reason, the diaphragm 10 vibrates and generates sound by vibrating the voice coil 10a at
most frequencies.
13-05-2019
2
[0009]
The mechanical resonance frequency of the vibration unit 13 is set to a lower frequency than the
mechanical resonance frequency of the acoustic unit because it senses driving by vibration, and
the vibration unit 13 has a minimum mechanical impedance at the mechanical resonance
frequency and is small. Even a driving force can generate a vibration that the human body
senses.
The vibration force in this case is determined by the product of the weight of the vibrating
portion 13 (approximately the weight of the magnetic circuit 11) and the acceleration of the
vibrating portion 13.
[0010]
SUMMARY OF THE INVENTION In the conventional electroacoustic transducer with vibration
function that operates according to the above principle, the mechanical resonance circuit has a
high sharpness of resonance Q because the vibration unit 13 with a large mass is vibrated. Due
to variations in weight of the vibrating section 13, variations in material thickness, width,
Young's modulus, etc. of the suspension 12, variations in supporting position of the suspension
12, etc., the vibrating section from the outside input to the voice coil 10a. The problem is that the
mechanical resonance frequency of the vibration unit 13 varies with respect to the signal of the
resonance frequency for vibrating 13 and appears as a large variation of the vibration force.
[0011]
The present invention solves the above-mentioned problems, and provides an electro-acoustic
transducer with a vibration function that can reduce variations in vibration force by adjusting the
mechanical resonance frequency of the vibration part at low cost, and a method of
manufacturing the same. It is.
[0012]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 of the present invention is a diaphragm having at least an outer periphery
fixed to a frame, and a voice coil attached to the diaphragm. An electro-acoustic transducer with
a vibrating function, comprising: a magnetic circuit provided with a magnetic gap into which the
voice coil is fitted; and a vibration unit having a suspension for supporting the magnetic circuit
vertically movable on the frame, A weight for resonance frequency adjustment is mounted on the
13-05-2019
3
vibration unit, and the weight for resonance frequency adjustment can be adjusted so that the
mechanical resonance circuit of the vibration unit has a predetermined resonance frequency.
[0013]
The invention according to claim 2 of the present invention is the resonance frequency adjusting
weight according to claim 1 in such a position that the center of gravity of the mechanical
resonance circuit does not move in the planar direction of the suspension before and after the
resonance frequency adjusting weight is attached. It is mounted and stable vibration without
rolling and the like can be obtained.
[0014]
According to a third aspect of the present invention, there is provided a method of measuring a
resonant frequency of a mechanical resonance circuit of the vibration unit after assembling the
vibration unit having at least a magnetic circuit and a suspension to a frame. Manufacturing an
electro-acoustic transducer with a vibration function provided with a step of determining a
weight for resonance frequency adjustment to be added from the determined resonance
frequency and a predetermined resonance frequency, and a step of mounting the weight for
resonance frequency adjustment on the vibrating portion The method is to suppress the variation
of the resonant frequency generated due to the variation of the used members by attaching the
selected weight for adjusting the resonant frequency to the vibrating part, and the resonant
frequency of the vibrating side of the electroacoustic transducer with a vibrating function It is
possible to provide a stable vibration-function-capable electroacoustic transducer by suppressing
individual variations of
[0015]
According to a fourth aspect of the present invention, in the method of manufacturing an electroacoustic transducer with a vibrating function according to the third aspect, the weight of the
vibrator after at least the assembling of the vibrator to the frame is performed. The resonance
frequency of the mechanical resonance circuit is set to be a resonance frequency higher than a
predetermined resonance frequency. By setting the resonance frequency of the mechanical
resonance circuit to be higher than the predetermined frequency in advance, the mounted
resonance frequency adjustment The tolerance of the weight can be extended to facilitate the
manufacture of the electro-acoustic transducer with vibration function.
[0016]
According to a fifth aspect of the present invention, there is provided a diaphragm having at least
an outer periphery fixed to a frame, a voice coil attached to the diaphragm, a magnetic circuit
13-05-2019
4
provided with a magnetic gap into which the voice coil is fitted, and An electro-acoustic
transducer with a vibrating function, comprising: a vibrating portion having a suspension that
supports a magnetic circuit vertically movable on the frame, wherein the frame and the
suspension and / or the fixed portion of the magnetic circuit and the suspension Is an area where
the fixed position can be selected, and by appropriately selecting the fixed position, a mechanical
resonance circuit of a vibrating portion comprising the magnetic circuit and the suspension that
supports the magnetic circuit vertically movable on the frame. It is easy to select the resonance
frequency to a predetermined one.
[0017]
The invention according to claim 6 of the present invention is that in which the fixed portions of
the frame and the suspension and / or the magnetic circuit and the suspension according to
claim 5 are made of weldable metal, they are efficiently produced by welding. It is possible to
provide a possible vibrating electroacoustic transducer.
[0018]
The invention according to claim 7 of the present invention is characterized in that the step of
measuring the resonant frequency of the mechanical resonant circuit of the vibrating portion
after integrating the vibrating portion having at least the frame, the suspension and the magnetic
circuit, and the measured resonant frequency Redetermining the fixed positions of the frame and
the suspension and / or the magnetic circuit and the suspension at a predetermined resonance
frequency; and the redetermined fixed position of the frame and the suspension and / or the
magnetic circuit and the suspension. The step of welding and fixing is performed, and after
integrating the frame and the vibrating portion, the resonance frequency of the mechanical
resonance circuit of the vibrating portion consisting of the actual suspension and the magnetic
circuit is measured, and the difference with the predetermined resonance frequency Frame and
the suspension for obtaining a predetermined resonance frequency from the And / or the
welding fixing position of the magnetic circuit and the suspension is determined to perform
welding again, and an efficient manufacturing method of an electro-acoustic transducer with
vibration function having a highly accurate mechanical resonance circuit of a resonance
frequency Can be provided.
[0019]
According to an eighth aspect of the present invention, in the method of manufacturing an
electro-acoustic transducer with a vibrating function according to the seventh aspect, the
vibrating portion having the frame, the magnetic circuit and the suspension is integrated. After
the step of measuring the resonance frequency of the mechanical resonance circuit, the frame
and the suspension are fixed by welding at a position where the predetermined resonance
13-05-2019
5
frequency can be obtained, and the frame and the welding are used to obtain the predetermined
resonance frequency. As it is performed between the suspensions, the frame is easy to be fixed
for welding because the frame is an exterior case, and welding can be performed more easily and
efficiently than those performed between the magnetic circuit and the suspension. It is.
[0020]
The invention according to claim 9 of the present invention is the method of manufacturing an
electro-acoustic transducer with a vibration function according to claim 7, wherein at least a
frame, a suspension and a magnetic circuit are integrated. The frame, the suspension, and the
magnetic circuit are integrated at a position where the resonance frequency is lower than the
resonance frequency, and the tolerance of the setting of the welding position when welding and
fixing again so as to become a predetermined resonance frequency is expanded. It is possible to
provide a manufacturing method capable of efficient welding and fixing.
[0021]
The invention according to claim 10 of the present invention is the frame and the suspension and
/ or the aforementioned at least one set of sampled when it is necessary to change at least the
welding conditions for fixing the magnetic circuit or the suspension or the frame. Welding and
fixing the magnetic circuit and the suspension at a predetermined position; measuring the
resonance frequency of a mechanical resonance circuit of a vibration unit including the magnetic
circuit and the suspension at the predetermined welding position; The vibration according to
claim 6, further comprising the step of determining the welding fixing position of the frame, the
suspension and / or the magnetic circuit and the suspension from the difference between the
resonance frequency obtained in the step and a predetermined resonance frequency. It is a
manufacturing method of an electroacoustic transducer with a function, and said magnetic circuit
or said suspension The frame and the suspension are adopted when the frame or the frame can
be supplied in a very stable state, and can be extremely mass-produced, and the frame and the
suspension for obtaining a predetermined resonance frequency of the machine resonant circuit
And / or the welding fixation position of the magnetic circuit and the suspension is determined in
advance by sampling the sampling, the magnetic circuit and the suspension, and welding fixation
is performed on a production line. Welding when there is a factor in setting a predetermined
resonance frequency such as surface condition, material thickness or surface condition of frame,
surface condition of magnetic circuit or weight variation, etc. or variation factor of welding
conditions (so-called production lot variation etc.)・ Simplify the process by redetermining the
fixed position and welding / fixed conditions, and improve the productivity. It is intended.
[0022]
The invention according to claim 11 of the present invention is a step of sampling at least one
13-05-2019
6
vibration unit and fixing it to a frame at least when there is a factor to change the weight for
resonance frequency adjustment attached to the vibration unit. And the step of measuring the
resonance frequency of the mechanical resonance circuit of the vibration unit, and the weight of
the weight for resonance frequency adjustment to be added is determined from the difference
between the resonance frequency obtained in the step and the predetermined mechanical
resonance frequency. Based on the process and this determination, the electroacoustic
transducer with vibration function is manufactured on the production line, and when the factor
for changing the resonance frequency adjustment weight occurs, the weight of the resonance
frequency adjustment weight is redetermined By doing this, the process is simplified and the
productivity is improved.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electro-acoustic
transducer with a vibrating function according to the present invention will be described below
with reference to FIGS.
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0024]
(First Embodiment) FIG. 1 is a top view of a vibration portion which is a main portion of an
electro-acoustic transducer with a vibration function according to a first embodiment of the
present invention, which mainly describes Claims 1 to 4. is there.
[0025]
The main difference from the prior art shown in FIG. 5 is that a resonance frequency adjusting
weight is attached to the weight portion to constitute an electro-acoustic transducer with a
vibrating function.
[0026]
According to the figure, reference numeral 11c denotes a magnetic circuit, which is composed of
a magnetic circuit main body 11d and a weight portion 11e which does not substantially
constitute a magnetic circuit, and the magnetic circuit 11c and a suspension 12 (hatched portion)
form a vibrating portion 13a. ing.
13-05-2019
7
[0027]
The reference numeral 15 denotes a fixing portion between the frame 16 and the suspension 12,
which is provided at four symmetrical positions, and is generally performed by bonding, but may
be another known method (crimping, welding).
The suspension 12 and the magnetic circuit main body 11d are integrated by molding when the
weight portion 11e is formed.
[0028]
Resonant frequency adjustment weights 14 for adjusting the mechanical resonance frequency of
the vibrating portion 13a are attached to the weight portion 11e at two places.
The weight 14 for resonance frequency adjustment of the mechanical resonance frequency is
provided on the diagonal of the position of the center of gravity formed by the magnetic circuit
main body 11d and the weight portion 11e, and even if the weight 14 for resonance frequency
adjustment is mounted Does not move in the planar direction of the suspension 12 and does not
change its position.
[0029]
The resonance frequency adjusting weight 14 is mounted at two positions in FIG. 1 as long as the
position of the center of gravity is not changed, but may be one or more than one.
[0030]
In addition, when the weight 14 for resonance frequency adjustment is provided at a position at
which the above-described gravity center position moves before and after the mounting, the
vibration is easily caused when the vibrating portion 13a vibrates.
[0031]
13-05-2019
8
The magnetic circuit 11c is fixed to the frame 16 via the suspension 12 to form the vibrating
portion 13a.
In this state, for example, the voice coil 10a attached to the dummy diaphragm 10 is inserted into
the magnetic gap of the magnetic circuit main body 11d, and a dummy current is supplied to the
voice coil 10a. The mechanical resonance frequency of the vibrating portion 13a is measured by
applying the frequency.
[0032]
The machine resonance frequency is calculated by the following (Equation 1).
[0033]
Machine resonance frequency Fo
[0034]
By previously measuring the mass (weight) m of the vibrating portion from the above (Equation
1), the weight of the weight 14 for resonance frequency adjustment to be added in order to
generate a predetermined resonant frequency in the vibrating portion calculate.
The weight of the weight 14 for resonance frequency adjustment to be added is divided by the
number of mounting points (2 in this embodiment), and the weight is attached to each mounting
point by bonding or the like.
[0035]
Thereafter, the diaphragm 10 with an actual voice coil 10a is fitted into the magnetic gap of the
magnetic circuit 11c by fitting the voice coil 10a into the magnetic gap of the magnetic circuit
11c and mounted on the frame 16, whereby the electroacoustic transducer with a vibration
function is manufactured.
[0036]
The above-mentioned manufacturing process can be incorporated into a production line and can
13-05-2019
9
be automated, and enables the manufacture of an electroacoustic transducer with a vibration
function of the resonance frequency of the vibration part 13a set extremely efficiently and stably.
is there.
[0037]
Further, in the first embodiment, the weight before resonance of the weight 14 for resonance
frequency adjustment is slightly lightened in advance (therefore, in order to adjust the
mechanical resonance frequency of the vibrating portion 13a by additionally mounting the
weight 14 for resonance frequency adjustment) The machine resonance frequency needs to be
set higher than a predetermined machine resonance frequency.
This makes it possible to set relatively easily within the tolerance of a given mechanical
resonance frequency during production.
[0038]
In the first embodiment, the mechanical resonance frequency at the initial stage is measured
during the manufacture of the electroacoustic transducer with the vibration function, and the
weight 14 for resonance frequency adjustment is mounted according to the measured
mechanical resonance frequency. However, instead of mounting the weight 14 for resonance
frequency adjustment on the upper surface of the weight portion 11e as shown in FIG. 1, an
opening is provided in the frame 16 on the back surface side of the weight portion 11e, and the
weight 14 for resonance frequency adjustment is If attached, it becomes possible to adjust the
predetermined resonance frequency even after the completion of the electroacoustic transducer
with a vibration function without using a dummy diaphragm and to improve productivity as well.
It is.
[0039]
(Second Embodiment) FIG. 2 is a top view of a vibrating portion which is a main part of an
electro-acoustic transducer with a vibrating function according to a second embodiment of the
present invention. FIG. 3 is a welded portion of the vibrating portion which is the same. FIG. 4 is
a top view of the welding portion of the vibrating portion which is the same main portion of the
same developed example.
13-05-2019
10
The fifth to eleventh aspects of the present invention will be mainly described according to the
second embodiment.
[0040]
Referring to FIG. 2, only differences from the prior art will be described. 12a is a suspension, and
the joint with the frame 16 is weld joint, and the possible range of this welding is 4 as a weldable
portion 17a in the longitudinal direction of the suspension 12a. It is a point secured for a long
time.
[0041]
Also in the second embodiment, as in the first embodiment, the mechanical resonance circuit of
the vibrating portion 13b is completed in the state of a semifinished product in which the
diaphragm 10 is not attached, and the mechanical resonance frequency can be measured. is
there.
Therefore, as in the first embodiment, the manufacturing process for obtaining a predetermined
mechanical resonance frequency from the difference between the mechanical resonance
frequency measured by mounting the dummy diaphragm 10 with the voice coil 10a and the
predetermined mechanical resonance frequency is performed. In the first embodiment, the
weight 14 for resonance frequency adjustment is added to the weight portion 11e. However, in
the second embodiment, the welding fixing position of the suspension 12a and the frame 16 is
obtained to obtain a predetermined mechanical resonance frequency. The mechanical resonance
frequency is made to be a predetermined one by fixing the position again by welding and fixing
the suspension 12a and the frame 16 by welding and changing the length of the suspension 12a
that substantially supports the vibrating portion 13b. .
[0042]
In order to adjust the machine resonance frequency to a predetermined one by adding the
welding position of the suspension 12a and the frame 16, the first welding fixing position is
lower than the predetermined machine resonance frequency in advance (so that the suspension
12a is extended) After measurement of the machine resonance frequency, it is important to reweld in order to obtain a predetermined machine resonance frequency.
13-05-2019
11
This makes it possible to set relatively easily within the tolerance of a given mechanical
resonance frequency during production.
[0043]
In the second embodiment, the final welding and fixing of the suspension 12a and the frame 16
are performed in a semifinished product in which the vibrating portion 13b is completed.
However, the opening is formed on the frame 16 side by welding and fixing the suspension 12a
and the frame 16. By setting it to the specified mechanical resonance frequency even in the
completed state after the diaphragm 10 is attached by welding and fixing from this opening, the
process of desorption of the dummy diaphragm can be eliminated to achieve more efficiency. It is
also possible to make it possible to
[0044]
FIG. 4 shows a developed example of the second embodiment, and the weldable portion 17a is
extended in the longitudinal direction of the suspension 12a in the second embodiment, whereas
this weldable portion is obtained in the deployed example. 17b is further widened in the width
direction.
[0045]
This is, for example, when the welding position for setting to a predetermined mechanical
resonance frequency by welding is approximate to the initial position, for example, when the
product is 20 mm square and the mechanical resonance frequency is about 120 Hz, the
resonance frequency is In order to change 2 Hz, a delicate adjustment of about 0.2 to 0.4 mm is
required, there is a possibility of welding repeatedly, and a change in welding conditions can be
considered, so as to obtain stable welding conditions. By making the width of the suspension of
the weldable part 17b larger than the width of the other parts, the influence of the weldable part
17b on the overall compliance of the suspension 12b is reduced, and the change of the welding
position is made. A large amount can be set to prevent overlapping welding and fixing.
[0046]
In the above-described second embodiment, the suspension 12a is described as being integrated
with resin molding on the side of the weight portion 11b, and only the frame 16 and the
suspension 12a are welded and fixed. It may be formed of a weldable metal, and may be fixed by
welding to the suspension 12a, in which case setting to a predetermined mechanical resonance
frequency can be performed between the suspension 12a and the weight portion 11b. From the
13-05-2019
12
viewpoint of quality, it is more efficient to weld and fix between the frame 16 and the suspension
12a which are easy to fix.
[0047]
In each of the above-described embodiments, the mechanical resonance frequency of the
vibrating portion is measured after completion of assembling each vibrating portion to the frame
of each of the electroacoustic transducers with the vibration function, and The additional
attachment of the weight for resonance frequency adjustment or the re-welding fixation between
the frame and the suspension or between the suspension and the weight part is performed to
obtain a predetermined mechanical resonance frequency from the difference. When it is possible
to supply the frame in an extremely stable state, the vibration part in which the weight part and
the suspension are integrated in advance can be extremely stably supplied to the magnetic
circuit. The predetermined resonance circumference such as the change of the weight for
frequency adjustment or the thickness of the suspension material or the weight variation of the
magnetic circuit main body When it is in a very stable state other than fluctuation factors of
resonance frequency (so-called production lot fluctuation etc.) when manufacturing a number of
electroacoustic transducers with vibration function, extract samples of one or more vibration
parts, and As in each embodiment, the vibration part of this sample is incorporated in the frame
to determine the weight for resonance frequency adjustment and the change of the welding
fixing position, and the vibration function is added based on the above determination until the
next occurrence of the fluctuation factor. It is also possible to produce an electroacoustic
transducer.
[0048]
As a result, measurement for setting a predetermined mechanical resonance frequency,
determination of a resonance frequency adjustment weight for setting a mechanical resonance
frequency, and determination of a welding position, which have been performed in the
manufacturing process of the individual electroacoustic transducer with vibration function, are
performed. It can be omitted to improve productivity.
[0049]
As described above, the electro-acoustic transducer with a vibration function according to the
present invention is an electro-acoustic transducer with a vibration function that can perform
adjustment of the mechanical resonance frequency of the vibrating portion in the manufacturing
process with extremely high accuracy and efficiency. It is possible to provide the manufacturing
method.
13-05-2019
13
[0050]
Brief description of the drawings
[0051]
1 is a top view of the vibration portion (before the attachment of the diaphragm) which is an
essential part of an embodiment of the electroacoustic transducer with a vibration function of the
present invention
[0052]
2 is a top view of the vibration portion (before the attachment of the diaphragm) which is the
same as the main portion of the other embodiment
[0053]
Fig. 3 Cross section of the same weld
[0054]
4 is a top view of the welding portion which is the same as the main portion of the other
embodiment
[0055]
Fig. 5 (a) Top view of the conventional electroacoustic transducer with vibration function
[0056]
Explanation of sign
[0057]
Reference Signs List 10 diaphragm 10a voice coil 11, 11c magnetic circuit 11a, 11d magnetic
circuit body 12, 12a, 12b suspension 13a, 13b vibrating portion 14 weight for resonance
frequency adjustment 16 frame 17a, 17b weldable portion
13-05-2019
14
1/--страниц
Пожаловаться на содержимое документа