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 JP2007088608
PROBLEM TO BE SOLVED: To provide a speaker device capable of detecting the vibration of a
voice coil body with high accuracy and reproducing it with high fidelity. SOLUTION: Even if the
reflection member 13 is connected to the voice coil body 8, since the reflection member 13 and
the optical sensor 12 are disposed on the central axis C of the voice coil body 8, the center of the
voice coil body 8 is obtained. The occurrence of deviation in weight distribution of the voice coil
body 8 with respect to the axis C is suppressed. Therefore, the occurrence of rolling is
suppressed to deteriorate the sound quality, and the amplitude operation of the original voice
coil body is detected with high accuracy. Therefore, high fidelity is reproduced. [Selected figure]
Figure 1
Speaker device
[0001]
In particular, the present invention relates to a speaker device capable of detecting the vibration
of a voice coil body with high accuracy and reproducing it with high fidelity.
[0002]
Conventionally, the speaker device is provided with a detection means for detecting the vibration
displacement of the vibration system consisting of a voice coil body, a diaphragm and a dust cap,
and the detection result by the detection means is negatively fed back to the input signal High
fidelity reproduction is realized by taking the difference and canceling the error in the vibration
system with respect to the input signal.
13-05-2019
1
[0003]
Regarding this detection means, for example, in the following Patent Document 1, a reflecting
member is fixed to the inner surface of the dust cap, an optical sensor is disposed at a position
facing the reflecting member, and the displacement of the dust cap is optically detected. A
technique for detecting displacement of a vibration system is disclosed.
[0004]
Further, as another example related to the detection means, in Patent Document 2 below, the
reflection member is fixed not to the inner surface of the dust cap but to the lower end of the
voice coil body, and an optical sensor is disposed immediately below the reflection member. A
technique is disclosed for detecting displacement of a vibration system by optically detecting
displacement of a coil body.
Japanese Utility Model Application Publication No. 63-16789 (FIG. 1) Patent No. 2940587
(Paragraph 35, FIG. 1, etc.)
[0005]
However, as disclosed in the above-mentioned Patent Document 1, when the reflective member is
fixed to the inner surface of the dust cap, mechanical deflection or resonance occurs in the dust
cap, and the displacement of the vibration system is highly accurate due to that effect. The
problem is that it can not be detected.
[0006]
In addition, as disclosed in Patent Document 2 described above, when the reflective member is
fixed to the lower end portion of the voice coil body, there are the following problems.
[0007]
First, the weight distribution of the voice coil body with respect to the central axis of the voice
coil body is biased, and the amplitude operation of the original voice coil body (piston motion:
the voice coil body is parallel in amplitude along the central axis of the voice coil body However,
vibration (rolling) occurs with an inclination from the central axis of the voice coil body, and
there is a problem that the original amplitude operation of the voice coil body can not be
13-05-2019
2
detected with high accuracy.
In addition, there is a problem that the ideal vibration can not be generated by rolling and the
sound quality is deteriorated.
[0008]
Second, since the voice coil serving as a heat source is wound around the voice coil body, the
reflection member connected to the voice coil body needs to be made of a heat resistant material.
Therefore, it is considered that the reflection member is made of metal having excellent heat
resistance, but since the metal is heavy, the weight of the voice coil body is increased, which
adversely affects the amplitude operation of the original voice coil body. The
[0009]
On the other hand, in order to suppress the increase in weight of the voice coil body, it may be
considered to constitute the reflection member with a resin lighter than metal, but in
consideration of heat resistance, usable resins have excellent heat resistance. Since the resin
which is limited to (for example, engineering plastic) and which is excellent in heat resistance is
expensive, there is a problem that the manufacturing cost of the device is increased.
[0010]
Third, due to the limitation of the size of the device, the light sensor disposed immediately below
the reflecting member must be disposed in the vicinity of the voice coil body, and the heat
generated from the voice coil body causes the characteristics of the light sensor to There has
been a problem that it changes, and in some cases, the light sensor is broken.
[0011]
The present invention has been made to solve the above-described problems, and in particular, it
is an object of the present invention to provide a speaker device capable of detecting the
vibration of a voice coil body with high accuracy and reproducing it with high fidelity. There is.
13-05-2019
3
[0012]
In order to achieve this object, the speaker device according to claim 1 comprises a magnetic
circuit, a cylindrical voice coil body vibratably disposed in the magnetic circuit, and a conical
shape from an outer peripheral surface of the voice coil body. And a dust cap covering the
opening surface of the voice coil body connected to the diaphragm and surrounded by the
diaphragm, and connected to the voice coil body. A connecting member extending toward the
central axis of the coil body, a first component fixed to the connecting member and located on
the central axis of the voice coil body and closer to the voice coil body than the dust cap, and And
a second component disposed opposite to the first component independently of the voice coil
body so as to sandwich the first component between the first component and the dust cap. And a
detection unit that detects vibration of the voice coil body optically with light traveling between
the forming element and the second component.
[0013]
The speaker device according to claim 2 is the speaker device according to claim 1, wherein the
connecting member radially extends from the first component toward the voice coil body and the
first component and the voice coil body And are connected.
[0014]
The speaker device according to claim 3 is the speaker device according to claim 1 or 2, wherein
a communication space communicating with the outside is formed around the second
component.
[0015]
The speaker apparatus according to claim 4 is the speaker apparatus according to any one of
claims 1 to 3, wherein a radiation fin extending radially from the periphery of the magnetic
circuit and a direction from the second component toward the radiation fin And a connecting
arm extending radially to connect the second component and the heat dissipating fin.
[0016]
The speaker device according to claim 5 is the speaker device according to any one of claims 1 to
4, wherein the first component is a light emitting element for emitting light, and the light
emitting element arranged side by side with the light emitting element The second component is
configured by any one of an optical sensor body having a light receiving element for receiving
the irradiated light and a reflecting member for reflecting the light emitted from the light
emitting element toward the light receiving element. Is constituted by the other of the light
sensor body and the reflecting member.
13-05-2019
4
[0017]
The speaker device according to claim 6 is the speaker device according to claim 5, wherein the
reflection member is made of resin integrally molded with the connection member, and at least a
portion facing the light sensor body is mirror plated. Is configured.
[0018]
The speaker device according to claim 7 is the speaker device according to any one of claims 1 to
4, wherein the first component is irradiated with a light emitting element body having a light
emitting element for emitting light, and the light emitting element The second component is
constituted by the other of the light emitting element body and the light receiving element body.
[0019]
According to the speaker device of the first aspect, since the first component is connected to the
voice coil body via the connecting member, the first component vibrates integrally with the voice
coil body.
On the other hand, since the second component is arranged opposite to the first component
independently of the voice coil body, the light traveling between the first component and the
second component Vibration of the voice coil body can be detected without being affected by
mechanical bending or resonance.
[0020]
Further, even if the first component is connected to the voice coil body, the first component and
the second component are disposed on the central axis of the voice coil body, so that the voice
relative to the central axis of the voice coil body The occurrence of bias in weight distribution of
the coil body is suppressed.
Therefore, it is possible to suppress the occurrence of rolling and the deterioration of the sound
quality, and to detect the piston motion which is the amplitude operation of the voice coil body
with high accuracy.
13-05-2019
5
[0021]
Thus, when detecting the vibration displacement of the vibration system comprising the voice
coil body, the diaphragm and the dust cap, the vibration of the voice coil body serving as the
vibration source of the vibration system can be detected with high accuracy. There is an effect
that high fidelity reproduction can be realized.
[0022]
According to the speaker device of the second aspect, in addition to the effect of the speaker
device of the first aspect, the first component and the voice coil body are connected by the
radially extending connection member, so that the voice coil There is an effect that the weight
distribution of the voice coil body with respect to the central axis of the body can be further
suppressed from being biased.
In addition, the air gap around the first component is secured by the gap formed by the
connecting members, and the design that the heat resistance of the first component to the heat
emitted from the voice coil body must be taken into consideration. There is an effect that the
burden can be eliminated.
Furthermore, since the weight of the connecting member can be reduced, it is possible to
suppress the change in the acoustic characteristic due to the change in the amplitude operation
of the voice coil body depending on the weight of the connecting member.
[0023]
According to the speaker device of the third aspect, in addition to the effect of the speaker device
of the first aspect or the second aspect, the communication space communicating with the
outside is formed around the second component. The air permeability around the two
components is secured, and the design burden of having to take into consideration the heat
resistance of the second component to the heat emitted from the voice coil body can be reduced.
[0024]
According to the speaker device of the fourth aspect, in addition to the effect of the speaker
device according to any one of the first to third aspects, the second component and the radiation
13-05-2019
6
fin are connected by the radially extending connection arm. Since the second component is fixed
at a predetermined position (a position facing the first component) in a state independent of the
voice coil body, the voice coil body The effect is that the heat generated can be dissipated.
[0025]
Further, in the heat dissipating fin, since the heat generated from the voice coil body is being
dissipated, it is possible to suppress the transfer of the heat generated from the voice coil body to
the second component via the heat dissipating fin and the connecting arm. It has the effect of
being able to
[0026]
According to the speaker device of the fifth aspect, in addition to the effects of the speaker device
according to any of the first to fourth aspects, for example, the light receiving element is
connected to the voice coil body instead of the reflection member, The light receiving element
may be configured to receive the irradiated light directly, but when the reflecting member and
the light receiving element are compared, generally the reflecting member is lighter than the
light receiving element. .
Therefore, by connecting the reflection member to the voice coil body, it is possible to suppress
the change in the acoustic characteristic due to the change in the amplitude operation of the
original voice coil body depending on the weight of the reflection member.
[0027]
Moreover, since the air permeability is secured around the reflective member as the first
component, the requirement on the heat resistance of the reflective member is relaxed.
Therefore, it is not necessary to constitute the reflecting member with a metal which is excellent
in heat resistance but has a heavy weight, an expensive functional resin (for example,
engineering plastic), etc., and a lightweight and inexpensive general-purpose thermoplastic resin
For example, the reflective member can be made of ABS (acrylonitrile-butadiene-styrene) or the
like.
13-05-2019
7
Therefore, it is possible to suppress the change in the amplitude operation of the voice coil body
by using a heavy material, and to suppress the increase in the manufacturing cost of the device
by using an expensive material.
[0028]
In addition, since the air permeability is secured around the light sensor body as the second
component, the heat emitted from the voice coil body changes the characteristics of the light
sensor body, and in some cases, the light sensor body is broken. It has the effect of being able to
prevent the occurrence of the harmful effect of being
[0029]
Furthermore, since the photosensor body having the light emitting element and the light
receiving element can be detached from the device as a single body, maintenance can be
improved as compared with the case where the light emitting element and the light receiving
element are separately disposed. There is an effect that the wiring distance required for the light
emitting element and the light receiving element can be shortened.
[0030]
According to the speaker device of the sixth aspect, in addition to the effect of the speaker device
of the fifth aspect, the reflecting member is made of resin integrally molded with the connecting
member, and at least a portion facing the light sensor body The reflection member is reduced in
weight, and the weight operation of the reflection member changes the amplitude operation of
the original voice coil body, thereby suppressing the change in acoustic characteristics. is there.
In addition, the number of parts can be reduced, and the manufacturing cost can be reduced.
[0031]
According to the speaker device of the seventh aspect, in addition to the effects of the speaker
device according to any of the first to fourth aspects, the light emitted from the light emitting
element is directly received by the light receiving element. As compared with the case where the
light irradiated from the element is received by the light receiving element through the reflection
13-05-2019
8
member, the light path length is shortened, so that the light receiving output can be increased
and the influence of the disturbance light can be suppressed.
Therefore, there is an effect that the vibration detection accuracy of the voice coil body can be
further improved.
[0032]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the attached drawings.
First, with reference to FIG. 1 and FIG. 2, a first embodiment relating to the speaker device of the
present invention will be described.
FIG. 1 is a cross-sectional view of the speaker device 1 according to the first embodiment, and
FIG.
[0033]
The speaker device 1 is particularly a device capable of detecting the vibration of the voice coil
body 8 with high accuracy and reproducing it with high fidelity.
As shown in FIG. 1, the speaker device 1 mainly includes a frame 2, a cone 3, a dust cap 4, a
magnetic circuit 5, a voice coil body 8, a radiation fin 9, and a detection unit 10. ing.
[0034]
The frame 2 supports the cone 3 and the like, and is formed in a substantially conical shape (see
FIG. 2) which is expanded in diameter toward the front (upper in FIG. 1, the same applies
hereinafter), and the body frame 2 a And a second flange 2c projecting inward from a rear end of
the main body frame 2a on the opposite side to the first flange 2b.
13-05-2019
9
[0035]
The cone 3 functions as a vibrating plate that vibrates air and radiates sound waves, and is
substantially paper cone-like, which is made of paper and has a predetermined gap with the main
body frame 2a and is expanded forwardly. See FIG. 2).
The front end of the cone 3 is connected to the first flange 2 b of the frame 2, and the rear end of
the cone 3 is connected to the outer peripheral surface of the voice bobbin 8 a constituting the
voice coil body 8. It is connected to the main body frame 2a via the same.
[0036]
The dust cap 4 functions as a diaphragm that radiates a sound wave as the cone 3 does, and
prevents dust, dirt and the like from entering the voice coil body 8 from the outside.
The dust cap 4 has a substantially hemispherical shape, and is connected to the outer surface of
the cone 3 so as to cover the opening surface of the voice coil body 8 exposed to the outside
from the central portion of the cone 3.
[0037]
The magnetic circuit 5 forms a magnetic field for vibrating the voice coil body 8 and includes a
yoke 6 and a magnet 7.
The yoke 6 is made of a ferromagnetic material, and has a cylindrical center yoke 6a coaxially
arranged with the central axis C of the voice coil body 8, and a bottom yoke extending outward
from the rear end of the center yoke 6a. 6b, a side yoke 6c erected to surround the voice coil
body 8 from the end of the bottom yoke 6b, and a top yoke 6d extending outward from the front
end of the side yoke 6c.
The top yoke 6 d is connected to the second flange 2 c of the frame 2, and the yoke 6 is
supported by the frame 2.
13-05-2019
10
[0038]
The magnet 7 is formed in a ring shape surrounding the center yoke 6a between the center yoke
6a and the voice bobbin 8a, and is supported by the bottom yoke 6b.
That is, the speaker device 1 is a so-called internal magnet type speaker device in which the
magnet 7 is disposed inside the voice coil body 8 (voice bobbin 8a). However, the speaker device
1 is the voice coil body 8 (voice bobbin It may be a so-called external magnet type speaker device
disposed outside 8a).
[0039]
The voice coil body 8 vibrates the cone 3 (dust cap 4), and includes a cylindrical voice bobbin 8a
and a voice coil 8b wound around the outer peripheral surface of the voice bobbin 8a.
In the drawing, the detailed illustration of the voice coil 8b is omitted.
The voice bobbin 8a is disposed between the magnet 7 and the side yoke 6c so as to be capable
of reciprocating oscillation in the front-rear direction (vertical direction in FIG. 1). The voice coil
8b is wound at a position facing the magnet 7 on the outer peripheral surface of the voice bobbin
8a, and one end side thereof is connected to an amplifier (not shown).
[0040]
When a current is supplied to the voice coil 8b by the power supplied from the amplifier, an
electromagnetic force (Lorentz force) is generated under the influence of the magnetic field
formed by the magnetic circuit 5, and the voice coil body 8 is longitudinally moved by this
electromagnetic force. Vibrate. Thus, when the voice coil body 3 vibrates, the cone 3 connected
to the voice coil body 8 and the dust cap 4 connected to the cone 3 vibrate with the vibration,
and the air vibrates due to the vibration. Sound waves are emitted.
13-05-2019
11
[0041]
The heat dissipating fins 9 radiate the heat generated from the voice coil 8b, and are composed
of a plurality of fins extending radially from the periphery of the side yoke 6c. Therefore, when a
current is supplied to the voice coil 8b, the voice coil 8b generates heat, but the heat is dissipated
to the outside through the radiation fin 9.
[0042]
The detection unit 10 detects the displacement of the vibration system consisting of the cone 3,
the dust cap 4 and the voice coil body 8 by optically detecting the vibration of the voice coil body
8, and the center of the voice coil body 8 The light sensor body 12 is disposed on the axis C at a
predetermined interval, and the reflecting member 13 is provided.
[0043]
The detection result of the detection unit 10 is negatively fed back and the difference with the
input signal is taken, and the error of the vibration system with respect to the input signal is
canceled.
Therefore, high fidelity reproduction can be performed by detecting the displacement
(displacement of the vibration system) of the voice coil body 8 with high accuracy.
[0044]
The light sensor body 12 includes a light emitting element (light emitting diode) 12a as a light
source for emitting light, a light receiving element (phototransistor) 12b arranged side by side
with the light emitting element 12a and receiving light emitted from the light emitting element
12a A holder 12c for supporting the element 12a and the light receiving element 12b, and a
support base 12d for supporting the holder 12c.
[0045]
The support base 12d is disposed rearward of the bottom yoke 6b such that a communication
13-05-2019
12
space K communicating with the outside is formed around the light emitting element 12a and the
light receiving element 12b.
Further, the support base 12c is supported by the heat dissipating fins 9 via the three first
connection arms 14 (see FIG. 2) which extend radially from the support base 12d and are
connected to the rear end of the heat dissipating fins 9 There is.
[0046]
Therefore, the light sensor body 12 can be fixed on the central axis C of the voice coil body 8 (a
position facing the reflecting member 13) independently of the voice coil body 8. Further, the
heat generated from the voice coil 8 b is dissipated to the outside through the gap formed
between the first connection arms 14 before being transmitted to the light sensor body 12.
Therefore, the heat emitted from the voice coil 8b is transmitted to the optical sensor 12, and the
adverse effect of the heat, such as a change or destruction of the characteristics of the optical
sensor 12, is suppressed. Can. Furthermore, since the heat generated from the voice coil 8b is
being dissipated in the heat dissipating fin 9, the heat generated from the voice coil 8b is
transmitted through the heat dissipating fin 9, the first connection arm 14 and the support base
12d to the light emitting element 12a. Can be suppressed.
[0047]
The reflection member 13 is formed in a substantially circular plate shape that is disposed to
face the light sensor body 12, and is configured by mirror-plating the surface that faces the light
sensor body 12. Further, the reflection member 13 is connected to the voice coil body 8 via the
three second connection arms 15 (see FIG. 2) radially extending from the reflection member 13
toward the voice coil body 8.
[0048]
The three second connection arms 15 are arranged at substantially equal intervals, and the other
end side opposite to the one end side connected to the reflecting member 13 is a voice which is a
heat source of the voice coil body 8 It is connected to the part (the front end of the voice bobbin
8a) farthest from the coil 8b. Further, the three second connection arms 15 and the substantially
13-05-2019
13
circular plate-like portion that constitutes the reflection member 13 are integrally molded of
resin. Specifically, a general purpose thermoplastic resin such as ABS (acrylonitrile-butadienestyrene) can be used.
[0049]
Thus, reflection is achieved by arranging the reflecting member 13 on the central axis C of the
voice coil body 8 and connecting the reflecting member 13 with the voice coil body 8 via the
second connection arm 15 configured radially. Even when the member 13 is connected to the
voice coil body 8, it is possible to suppress the occurrence of deviation in weight distribution of
the voice coil body 8 with respect to the central axis C of the voice coil body 8.
[0050]
In addition, since a gap is formed between the three second connection arms 15 and air
permeability around the reflecting member 13 is secured by the gap, the requirement on the heat
resistance of the reflecting member 13 is relaxed.
Therefore, it is not necessary to form the reflecting member 13 with a metal having excellent
heat resistance but having a heavy weight, an expensive functional resin (for example,
engineering plastic), etc., and a lightweight and inexpensive general-purpose thermoplastic resin
For example, the reflecting member 13 can be made of ABS (acrylonitrile-butadiene-styrene) or
the like. Therefore, it is possible to suppress the change in the amplitude operation of the voice
coil unit 8 by using a heavy material, and the increase in the manufacturing cost of the device by
using an expensive material.
[0051]
Furthermore, since the reflection member 13 is made of resin integrally molded with the second
connection arm 15 and configured by mirror-plating a portion facing the light sensor body 12,
the weight of the reflection member 13 is reduced, Due to the weight of the reflecting member
13, the amplitude operation of the original voice coil body is changed, and the change of the
acoustic characteristic can be suppressed. In addition, the number of parts can be reduced, and
the manufacturing cost can be reduced.
13-05-2019
14
[0052]
According to the detection unit 10 configured as described above, since the reflecting member
13 is connected to the voice coil body 8 via the second connecting arm 15, the reflecting
member 13 is vibrated as the voice coil body 8 vibrates. Also, the distance between the reflecting
member 13 and the light sensor body 12 changes. By detecting the change in the distance based
on the light received from the light emitting element 12a to the light receiving element 12b via
the reflecting member 13, the vibration displacement of the voice coil body 8 and hence the
vibration system including the cone 3 and the dust cap 4 are obtained. Vibration is detected.
[0053]
As described above, according to the speaker device 1 of the first embodiment, since the
reflecting member 13 is connected to the voice coil body 8 via the second connecting arm 15,
the reflecting member 13 is a voice coil body. It will vibrate integrally with 8. On the other hand,
since the light sensor body 12 is disposed to face the reflecting member 13 independently of the
voice coil body 8, the machine of the dust cap 4 is driven by the light traveling between the
reflecting member 13 and the light sensor 12. It is possible to detect the vibration of the voice
coil body 8 without being affected by the typical bending or resonance.
[0054]
Further, even if the reflecting member 13 is connected to the voice coil body, the reflecting
member 13 and the optical sensor 12 are disposed on the central axis C of the voice coil body 8,
so the central axis C of the voice coil body 8 is The occurrence of bias in the weight distribution
of the voice coil body 8 is suppressed. Therefore, it is possible to detect the piston motion which
is the amplitude operation of the voice coil body 8 which is originally intended with high
accuracy.
[0055]
Thus, when detecting the vibration displacement of the vibration system consisting of the voice
coil body 8, the cone 3, and the dust cap 4, the vibration of the voice coil body 8 as the vibration
source of the vibration system is detected with high accuracy. Since it is possible, high fidelity
reproduction can be realized.
13-05-2019
15
[0056]
Also, for example, as described later, the light receiving element 12b is connected to the voice
coil body 8 instead of the reflecting member 13, and the detection unit 19 is made to directly
receive the light emitted from the light emitting element 12a. Although it is possible to configure,
when comparing the reflection member 13 and the light receiving element 12b, generally, the
reflection member 13 is lighter in weight than the light reception element 12b.
Therefore, by connecting the reflecting member 13 to the voice coil body 8, it is possible to
suppress the change in the acoustic characteristic due to the change in the original vibration of
the voice coil body 8 depending on the weight of the reflecting member 13.
[0057]
Furthermore, since the light emitting element 12a, the light receiving element 12b, and the
holder 12c can be separately attached to and detached from the speaker device 1, maintenance is
improved compared to the case where the light emitting element 12a and the light receiving
element 12b are separately provided. Thus, the wiring distance required for the light emitting
element 12a and the light receiving element 12b can be shortened.
[0058]
Next, a speaker device 100 according to a second embodiment will be described with reference
to FIG.
FIG. 3 is a cross-sectional view of the speaker device 100 according to the second embodiment.
About the speaker device 100 of this 2nd example, the same numerals are attached about the
same composition as the speaker 1 of 1st example, and the explanation is omitted.
[0059]
The speaker device 1 according to the first embodiment described above includes the reflection
member 13 as a component of the detection unit 10, whereas the speaker device 100 according
13-05-2019
16
to the second embodiment does not include the reflection member 13 and detects the same. The
unit 19 is configured. That is, the speaker device 100 according to the second embodiment
includes, as the detection unit 19, the light emitting element 20 disposed at a predetermined
interval on the central axis C of the voice coil body 8, and the light receiving element 21. .
[0060]
The light emitting element body 20 includes a light emitting element (light emitting diode) 20a
as a light source for emitting light, a holder 21b for supporting the light emitting element 20a,
and a support base 20c for supporting the holder 21b. The support base 20 c is supported by the
first connection arm 14.
[0061]
The light receiving element body 21 includes a light receiving element (phototransistor) 21a that
receives the light emitted from the light emitting element 20a, and a holder 21b that supports
the light receiving element 21a. The light receiving element 21 radially extends from the holder
21 b toward the voice bobbin 8 a and is supported by a third connecting arm 23 that connects
the holder 21 b and the voice bobbin 8 a.
[0062]
According to this detection unit 19, since the light receiving element body 21 is connected to the
voice coil body 8 through the third connecting arm 23, the light receiving element body 21 also
vibrates as the voice coil body 8 vibrates. The distance between the light receiving element 21
and the light emitting element 20 changes. The change in the distance is detected by the light
emitted from the light emitting element 20a and received by the light receiving element 21a,
whereby the vibration displacement of the voice coil body 8 and hence the vibration of the
vibration system including the cone 3 and the dust cap 4 are detected. Ru.
[0063]
As described above, according to the speaker device 100 of the second embodiment, the light
13-05-2019
17
receiving element 21 is connected to the voice coil body 8 through the third connecting arm 23.
It will vibrate integrally with it. On the other hand, since the light emitting element body 20 is
disposed opposite to the light receiving element body 20 independently of the voice coil body 8,
the dust cap is generated by the light traveling between the light emitting element body 20 and
the light receiving element body 21. The vibration of the voice coil body 8 can be detected
without being influenced by the mechanical deflection or resonance of 4.
[0064]
Further, even if the light receiving element 21 is connected to the voice coil body 8, the light
emitting element 20 and the light receiving element 21 are disposed on the central axis C of the
voice coil body 8. The occurrence of deviation in weight distribution of the voice coil body 8 with
respect to the central axis C is suppressed. Therefore, the original amplitude operation of the
voice coil body 8 can be detected with high accuracy.
[0065]
Thus, when detecting the vibration displacement of the vibration system consisting of the voice
coil body 8, the cone 3, and the dust cap 4, the vibration of the voice coil body 8 as the vibration
source of the vibration system is detected with high accuracy. Since it is possible, high fidelity
reproduction can be realized.
[0066]
Further, since the light emitted from the light emitting element 20a is directly received by the
light receiving element 21a, for example, as described in the first embodiment, the light emitted
from the light emitting element 12a is received via the reflecting member 13 As compared with
the case where light is received by 12b, as a result of shortening the optical path length, the light
reception output can be increased and the influence of disturbance light can be suppressed.
Therefore, the vibration detection accuracy of the voice coil body 8 can be further improved.
[0067]
Although the present invention has been described above based on the embodiment, the present
invention is not limited to the above embodiment, and various improvements and modifications
13-05-2019
18
can be made without departing from the scope of the present invention. It can be easily guessed.
[0068]
For example, in the speaker device 1, although the case where the reflecting member 13 is
formed in a substantially circular plate shape has been described, instead of this, the reflecting
member 13 is formed in a substantially hemispherical shape projecting to the dust cap 4 side
The portion facing the light sensor body 12 may be configured by mirror plating.
In such a case, the light collection performance can be improved, and the detection accuracy of
the detection unit 10 can be improved.
[0069]
Further, in the speaker device 1, the case where the reflection member 13 is connected to the
voice coil body 8 has been described, but the reflection member 13 and the light sensor body 12
may be arranged in reverse. Although the case where the light receiving element body 21 is
connected to the voice coil body 8 has been described, the light emitting element body 20 and
the light receiving element body 21 may be disposed in reverse. Even in such a case, the same
effects as described above can be obtained.
[0070]
It is sectional drawing of the speaker apparatus of 1st Example. It is an external appearance
perspective view of a speaker apparatus, and is a figure which cuts and shows a part of it. It is
sectional drawing of the speaker apparatus of 2nd Example.
Explanation of sign
[0071]
1, 100 speaker device 3 cone (diaphragm) 4 dust cap 5 magnetic circuit 6 yoke (part of magnetic
circuit) 7 magnet (part of magnetic circuit) 8 voice coil body 8 a voice bobbin (part of voice coil
13-05-2019
19
body) 8b Voice coil (part of voice coil body) 9 Heat radiation fin 10, 19 Detection unit (detection
unit) 12 Optical sensor body (part of detection unit, first component, second component) 12a
Light emitting element (optical sensor) Part of body 12b Light receiving element (part of light
sensor body) 12c Holder (part of light sensor body) 12d Support base (part of light sensor body)
13 Reflective member (part of detection unit, first configuration Element, second component 14
first connection arm (connection arm) 15 second connection arm (connection member) 20 light
emitting element body (part of detection unit, first component, second Component 20a Light
emitting element (part of light emitting element) 20b Holder (part of light emitting element) 20c
Support base (part of light emitting element) 21 Light receiving element (part of detection unit,
first component) , 2nd component) 21a light receiving element (part of light receiving element
body) 21b holder (part of light receiving element body)
13-05-2019
20

JP2002271890

JP2001119792

Document 1001845

JP2000175291

JP2003158792

JP2003244790

JP2003009493

JP2000184487

JP2000295687

JP2002176692