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DESCRIPTION JP2001078285

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DESCRIPTION JP2001078285
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device for faithfully reproducing low frequency complex waveforms such as musical
tones.
[0002]
2. Description of the Related Art In the conventional speaker device, in order to prevent vibration,
the housing of the speaker device is made of a hard and heavy material and made robust, and the
speaker unit is firmly fixed to the speaker housing. However, with this method, the speaker
housing can not completely suppress mechanical vibration generated by the speaker unit, and as
a result, the housing of the speaker vibrates to generate an irregular sound wave, for example, it
is emitted from the diaphragm. Sound is superimposed on the sound, resulting in the result of
disturbing the waveform.
[0003]
Furthermore, most of the conventional speaker housings have a box-like shape, and furthermore,
since the shapes of the baffles and side plates are flat, the displacement of the material due to
vibration becomes large, and the radiation area of the sound waves becomes large. Because it is
wide, it generates a considerable amount of noise. As a result, the relative time relationship of the
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component waveforms constituting the original waveform is greatly disturbed, and the faithful
reproducibility of the original waveform is impaired.
[0004]
SUMMARY OF THE INVENTION The above-mentioned disturbance in time relation (hereinafter
referred to as time distortion). ) Can not be solved by the concept of conventional speaker
technology, and while reproduction of sine waves realizes wide band low distortion rate,
reproduction of sounds existing in the natural world and musical tones can not obtain true
fidelity There was a problem of that.
[0005]
In the conventional speaker fixing method as described above, the magnetic circuit can not be
completely stopped in terms of vibration, and the vibration is transmitted to the speaker housing
through the frame, and the vibration of the speaker housing (mainly The sound wave from the
baffle surface mixes with the reproduced sound to disrupt the waveform of the reproduced
sound, and the vibration of the speaker housing itself becomes noise, which has been a major
impediment to high fidelity reproduction.
[0006]
Also, the vibration transmitted to the speaker housing is transmitted to the speaker unit again
through the frame to generate unnecessary vibration in the entire speaker unit, and the
transmitted vibration results in the original vibration of the diaphragm. It was superimposed on
the vibration, further degrading the sound quality of the speaker.
[0007]
In addition, since the speaker housing is generally box-shaped, flat plate vibration is likely to
occur, and the vibration is reflected by a corner surface that folds around 90 degrees to generate
a complicated vibration mode, resulting in a waveform. Problem of promoting the disorder of the
[0008]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above
problems and to provide a speaker apparatus capable of reproducing a waveform faithful to the
original waveform with less time distortion compared to the prior art.
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[0009]
A speaker device according to the present invention includes a magnet, a frame, and a
diaphragm, and the electromechanical conversion of the low frequency signal is performed in
response to the low frequency signal. A speaker device comprising a speaker unit for vibrating a
diaphragm to generate and emit sound waves from the front surface of the diaphragm, wherein
the speaker unit is fixed to the speaker unit via a first buffer member, and the front surface of the
diaphragm is excluded. Speaker housing having a structure substantially covering the speaker
unit and having a hollow housing shape closed in a plane including a continuous curved surface,
and fixed at the center of gravity of the back surface of the magnet of the speaker unit and
extending in the rear direction A support member which penetrates a portion of the existing rodlike member and is fixed to the speaker casing through a second buffer member and supports the
rod-like member on a support plane Characterized by comprising a.
[0010]
In the above speaker device, preferably, the rod-like member penetrates a portion of the speaker
housing and is fixed to the speaker housing via a third buffer member.
[0011]
Furthermore, in the above speaker device, preferably, the rod-shaped member is fixed to a rodshaped member to which the speaker unit and the speaker housing are fixed, and a supporting
point for supporting the rod-shaped member. It further comprises a weight for holding in a target
equilibrium state.
[0012]
Still further, in the above-mentioned speaker device, preferably, the material of the speaker
casing is polystyrene foam, balsa, or scissors.
[0013]
In the above speaker device, preferably, the frame of the speaker unit is attached to the speaker
casing in a smooth shape without unevenness.
[0014]
Furthermore, in the above-mentioned speaker device, preferably, the above-mentioned housing
shape is a spherical shape, an elliptical shape, a spherical deformed shape, or an egg shape.
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[0015]
Still further, in the above-mentioned speaker device, preferably, a baffle portion which is a part of
the speaker casing located outside the speaker unit can be seen when the speaker device is
viewed from the front of the speaker unit. The shape is characterized in that the shape of the
casing reduces the area of the baffle portion substantially to zero.
[0016]
Further, in the above speaker device, preferably, at least one of the rod-like member and the
support member is interposed with a buffer member for damping longitudinal wave vibration by
changing mechanical impedance. It is characterized by
[0017]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0018]
<Embodiment> FIG. 1 is a side view of a longitudinal section showing the structure of a speaker
apparatus according to an embodiment of the present invention, and FIG. 2 is a view around the
speaker unit 1 of the speaker apparatus of FIG. It is a side view of the longitudinal section
showing detailed structure.
[0019]
The speaker apparatus of this embodiment, as shown in FIG. 1, includes a magnet 2, a frame 3
and a diaphragm 4, and vibrates by electro-mechanically converting a low frequency signal in
response to a low frequency signal. A speaker device comprising a speaker unit 1 which vibrates
the plate 4 to generate and radiate a sound wave from the front surface of the diaphragm 4 and
is characterized by having a structure for reducing the above-mentioned time distortion as much
as possible. .
Specifically, the speaker housing 11 is fixed to the frame 3 of the speaker unit 1 via the buffer
member 5 and has a structure that substantially covers the speaker unit 1 except for the front
surface of the diaphragm 4, and the flat portion is It has a so-called egg shape which is a hollow
cylindrical shape closed by a surface including a continuous curved surface substantially free of
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the light.
Here, one end of the rod-like member 6 for supporting the speaker unit 1 is fixed to the center of
gravity 2a of the back surface of the magnet 2 of the speaker unit 1 and extends in the rear
direction, and the other end is the speaker housing 11 It passes through a part of the rear
housing 12 located at the rear and is fixed to the speaker housing 11 via a buffer member 16.
[0020]
In this specification, the front direction (the direction toward the left in the figure) of the
diaphragm 4 of the speaker unit 1 is taken as the front direction of the speaker apparatus, and
the direction from the rear of the magnet 2 of the speaker unit 1 to the right in the figure The
direction is referred to as the rear direction of the speaker device.
Then, the rod-like member 6 is vertically supported by the support member including the
support rod attachment member 10, the support rod 15, and the fixing base 20, where the
support rod 15 penetrates a part of the lower portion of the speaker housing 11 and It is fixed
via the buffer member 18 and supports the rod member 6 on the support plane.
In addition, the weight 7 is fixed to the rod-like member 6 to which the speaker unit 1 and the
speaker housing 11 are fixed, and the rod-like member 6 is a support member supporting the
rod-like member 6. Is provided to hold in static equilibrium.
[0021]
Hereinafter, the structure of the speaker device of the present embodiment will be described in
detail with reference to FIGS. 1 and 2. FIG.
[0022]
The speaker unit 1 includes a magnet 2, a frame 3 and a diaphragm 4, and vibrates the
diaphragm 4 by electro-mechanically converting a low frequency signal in response to the low
frequency signal. Sound waves are emitted from the front side.
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A voice coil not shown in FIG. 1 is disposed in the gap between the yoke and the plate, and when
a low frequency signal is applied to the voice coil, the magnetic flux of the gap causes the voice
coil to vibrate according to the low frequency signal.
The voice coil is mechanically connected to the diaphragm, and the diaphragm 4 vibrates
according to the vibration of the voice coil, and the sound wave corresponding to the low
frequency signal mainly radiates from the front of the diaphragm 4 to the left in the figure. Be
done.
[0023]
One end of a cylindrical rod member 6 is joined and fixed to the center of gravity point 2a of the
back surface of the magnet 2 of the speaker unit 1, while the rod member 6 extends in the
horizontal direction toward the rear surface of the speaker device The other end of the rodshaped member 6 penetrates a part of the rear housing 12 of the speaker housing 11 and is
fixed to the rear housing 12 of the speaker housing 11 via the buffer member 16.
Here, a screw groove 17a is formed at the other end of the rod-like member 6, and the rod 17 is
fitted with the nut 17 via the buffer member 16 by rotating the nut 17 by fitting the nut 17 into
the screw groove 17a. It is fixed to the rear 12.
A support rod attachment member 10 is attached to a substantially central portion of the rodshaped member 6 so as to cover the outer periphery of the rod-shaped member 6 so as to be
connected and fixed with the rod-shaped member 6. One end of a support bar 15 for supporting
in a direction is connected.
The other end of the support rod 15 is connected to a fixed base 20 mounted on a flat ground G,
and the support rod 15 penetrates a part of the speaker housing 11 and is buffered at its
generally central portion. It is fixed via the member 18.
[0024]
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Further, between the position of the support rod attaching member 6 in the rod member 6 and
the position passing through the rear part 12 of the rod, a screw groove 8 is formed on the outer
periphery of the rod member 6 over a predetermined length.
The screw portion of the weight 7 is fitted in the screw groove 8 and the horizontal position of
the weight 7 is made movable by rotating the weight 7 around the rod-like member 6.
Then, the weight 7 is moved to be fixed to the rod-like member 6 to which the speaker unit 1 and
the speaker housing 11 are fixed, and the support point of the support rod attaching member 10
which is a support member supporting the rod-like member 6 is the center. Balance is
maintained by holding the rod 6 in a static equilibrium state.
After the balance is taken, the weight 7 can be fixed to the rod-like member 6 by screwing the
screw 9 penetrating the weight 7 in the direction of the rod-like member 6.
With the above configuration, the support rod 15 and the fixing base 20 support the rod-like
member 6 connected via the support rod attachment member 10 in a substantially horizontal
direction.
[0025]
The method of joining the center of gravity 2a on the back of the magnet 2 to the rod member 6,
joining the rod member 6 to the support rod mounting member 10, and joining the support rod
mounting member 10 to the support rod 15 are as follows. There are no particular limitations as
long as various methods such as fixation with screws, press fit, adhesion, welding, etc. can be
used, and any method can be used for firm bonding.
[0026]
Since it is necessary to hold the rod member 6 in a static equilibrium state with the speaker unit
1 and the speaker housing 11 etc. joined, the rod member 6 and the weight 7 for balance should
be joined. It is desirable to use a method such as bonding with the upper screw 8 or bonding with
the screw 9 for the balance weight 7 or a combination of both.
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However, in the case of mass-produced products, it is also possible to fix them unless there is a
design change, that is, when the balance position of the weights 7 is known beforehand by
design, fix the weights 7 to the rod-like member 6, or You may form integrally.
[0027]
The method of joining the support rod 15 and the fixing base 20 may be any of various methods
such as screwing, press fitting, bonding, welding, etc., but it is not particularly limited as long as
it can be strongly joined.
However, removable methods such as screwing are desirable for movement, transportation, etc.
[0028]
Furthermore, the mechanical impedance is suddenly changed by interposing a buffer 19 different
in size, weight, or material etc. on a part of the support rod 15, and the vibration transmitted
from the upper part of the support rod 15 to the fixed base 20. Can be damped and suppressed,
and vibrations that can not be absorbed by the fixed base 20 and the ground G can be damped
and suppressed.
[0029]
Next, the material of the speaker housing 11 is preferably not polystyrene used in the prior art,
but polystyrene foam, balsa or straw which is a lightweight material compared to wood.
The speaker housing 11 has a hollow so-called egg shape and is joined by a screw 13 via the
buffer member 5 at the front of the frame 3 of the speaker unit 1 and further at the lower
portion of the speaker housing 11 with the support rod 15 and the buffer It is held in contact via
18.
Further, the rear end of the rod member 6 is held by using the nut 17 via the buffer member 16.
However, depending on the size and shape of the speaker, bonding at this portion may be
omitted.
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[0030]
Further, in consideration of the ease of attaching the speaker unit 1, the rod 6, the weight 7 and
the like, the rear part 12 of the case is separated and separable, and is fastened to the speaker
case 11 using the screw 14. It is preferable to fix it.
[0031]
In the speaker apparatus configured as described above, the speaker unit 1 is not screwed to the
speaker housing 11 as in the prior art speaker system, but the center of gravity of the back
surface of the magnet 2 of the speaker unit 1 One end of the rod member 6 is fixed to the point
2a, and the support rod 6 is fixed to the support rod 6 by the support rod mounting member 10
fixed to the center of gravity on the rod member 6 Installed on Grand G.
[0032]
The mechanical vibration generated in the speaker unit 1 is transmitted to the support rod 15
through the support rod attaching member 10 in a state where static equilibrium is maintained
by the rod member 6 and the weight 7, and the ground G is passed through the fixing base 20.
Absorbed by
The front portion of the speaker housing 11 is softly fixed by the mounting screw 13 of the front
frame 3 of the speaker unit 1 via the buffer member 5, and the bottom portion of the speaker
housing 11 is connected to the support rod 15 via the buffer member 18. It is held in a state of
soft contact.
[0033]
When the size and weight of the speaker housing 11 are large, as shown in FIG. 1, the rear
portion of the speaker housing 11 is cushioned to one end of the rod-like member 6 in order to
maintain the strength of the structure. It is desirable to soften and hold by means of the nut 17
via the member 16.
[0034]
Furthermore, it is preferable that the frame 3 of the speaker unit 1 be attached to the speaker
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housing 11 in a smooth shape without unevenness.
Thereby, the reflection of the sound wave emitted from the speaker unit 1 can be significantly
reduced, and high-quality reproduced sound can be obtained.
[0035]
Furthermore, it is preferable that the housing shape consisting of the speaker housing 11 and the
housing rear portion 12 be a hollow housing shape closed with a continuous curved surface
substantially free of flat portions, specifically, as shown in FIG. Thus, although it is egg-shaped,
the present invention is not limited to egg-shaped, and may be spherical, elliptical, or spherical
deformed.
In addition, it may be in the form of a hollow casing closed by a surface including a continuous
curved surface. Furthermore, the baffle portion which is a portion of the speaker housing located
outside the speaker unit, which can be seen when the speaker device is viewed from the front of
the speaker unit 1, has a curved shape, and the housing shape is the area of the baffle portion
Preferably, the shape is reduced to substantially approach zero. Thereby, the noise radiated from
the front surface of the speaker housing 11 can be significantly reduced, and the fidelity of the
reproduced sound generated by the diaphragm 4 can be enhanced.
[0036]
That is, the physical rigidity can be obtained by forming the housing shape into a hollow casing
shape closed by a surface including a continuous curved surface or, more preferably, by a
continuous curved surface without a flat portion substantially. It can be enhanced and the
occurrence of vibration can be suppressed. For example, by making the housing shape into an
egg shape that is a rod shape that is closed by a continuous curved surface substantially free of
flat portions, the distance between the inner surfaces that affects the vibration of sound waves
inside the speaker housing 11 is not constant. The opposing surfaces of the same distance can be
reduced, and the occurrence of standing waves inside the housing can be significantly reduced.
In particular, by forming the case of the closed shape with a continuous curved surface,
simplification of the vibration mode by the reflection of the vibration wave, mainly the
longitudinal wave on the surface of the case can be realized. And the noise-like sound wave
emitted from the case surface by the simplification of the vibration mode can greatly reduce the
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radiation amount as compared with the sound wave emitted from the general box-like case
Higher order components of the sound wave are also suppressed, and deterioration in the quality
of the reproduced sound can be suppressed.
[0037]
The shape of the housing consisting of the speaker housing 11 and the rear housing 12
according to this embodiment is a shape that closes with a smooth continuous curved surface
having no flat surface regardless of whether it is a spherical shape or an egg shape. preferable.
Although this is to prevent the vibration mainly composed of longitudinal waves from being
reflected by the abrupt change of the shape, even at high frequencies, even small changes on the
surface can not be ignored. For this reason, it is desirable that the outer surface and the inner
surface of the speaker housing 11 and the rear housing 12 have a smooth surface free from the
presence of extremely small irregularities.
[0038]
<Effects of the Embodiment> As described above, according to the speaker device of the present
embodiment, mechanical vibration generated in the speaker unit 1 is transmitted from the rod
member 6 to the support rod 15 through the support rod attachment member 10. And is
absorbed to the ground G through the fixed base 20. Therefore, the transmission of mechanical
vibration generated by the speaker unit 1 to the speaker housing 11 is attenuated and
suppressed, and the mechanical vibration transmitted from the housing 11 to the speaker unit 1
vibrated by the back surface sound pressure of the speaker unit 1 is also Attenuation can be
suppressed. In addition, the speaker unit 1 is fixed to the speaker housing 11 via the buffer
member 5, while the support rod 15 is fixed to the housing rear portion 12 via the buffer
member 18, so the airtightness inside the housing can be improved. As a result, the increase in
sound pressure of the resonant bass portion is suppressed, and high-quality reproduced sound
can be obtained.
[0039]
Further, since the rod-like member 6 is fixed to the rear part 12 of the housing via the buffer
member 16, the air tightness inside the housing can be enhanced, and as a result, the increase in
sound pressure of the resonant bass portion is suppressed. You can get high quality playback
sound.
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[0040]
Furthermore, the weight 7 is fixed to the rod-like member 6 to which the speaker unit 1 and the
speaker housing 11 are fixed, and the supporting point of the support rod attaching member 10
which is a supporting member for supporting the rod-like member 6 is the center. The speaker
unit 1 and the speaker housing 11 can be stably held and supported in the static equilibrium
state because they are provided to hold the rod-like member 6 in the static equilibrium state.
[0041]
Furthermore, since a lightweight material such as expanded polystyrene is used as the material
of the speaker housing 11 and the rear part 12 of the housing, the damping speed of vibration
inside the housing can be increased, and acoustic noise is reduced. Superior characteristics can
be obtained.
[0042]
Further, by attaching the frame 3 of the speaker unit 1 to the speaker housing 11 in a smooth
shape without unevenness, the reflection of the sound wave emitted from the speaker unit 1 can
be greatly reduced, so that high quality can be achieved. You can get the playback sound.
[0043]
Furthermore, the housing shape of the speaker housing 11 and the rear part 12 of the housing is
a hollow closed with a surface including a continuous curved surface substantially free of flat
portions such as, for example, a spherical shape, an elliptical shape, a spherical deformation
shape or an egg shape. Because of its box shape, displacement vibration such as plate vibration
can be reduced, and rigidity due to the shape is high, so light and thin materials can be used, and
vibration damping speed can be increased. Characteristics can be obtained.
In addition, the generation of standing waves can be reduced compared to a box shape, and in
particular, since there are few opposing surfaces of the same distance in the shape of an egg, the
generation of standing waves can be suppressed to a very low level. Performance can be
obtained.
[0044]
Furthermore, in addition to the curved surface of the baffle portion which is the front surface of
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the housing joined to the front surface portion of the speaker unit 1 with the screw 13, the
housing shape of the speaker housing 11 substantially corresponds to the area of the baffle
portion. Because the area is small so that the area is small, noise radiated from the front of the
case can be reduced, and the fidelity of the reproduced sound generated by the diaphragm 4 can
be enhanced. .
[0045]
Furthermore, the mechanical impedance can be suddenly changed by interposing buffer
members 19 different in size, weight, or material, etc., on a part of the support rod 15, so that
longitudinal wave vibration can be attenuated. Quality can be improved.
[0046]
<Modifications> As shown in FIG. 1, the speaker apparatus according to the present embodiment
uses the fixing base 20 on the ground G which is a horizontal ground plane, and is mounted on a
wall surface or ceiling structurally. It is also possible to use.
Therefore, it is desirable that the fixing base 20 be configured to be able to be screwed or the
like.
Further, it is desirable that the length of the support bar 15 be changed so that the position of
the speaker device at the time of horizontal installation or wall mounting can be freely adjusted.
[0047]
Further, a buffer member (a member similar to the buffer member 19) different in size, weight, or
material may be interposed in a part of the rod-like member 6.
As a result, the mechanical impedance can be suddenly changed, longitudinal wave vibration can
be attenuated, and the quality of the reproduced sound can be improved.
[0048]
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As described above, according to the speaker device of the present invention, the speaker device
according to the present invention includes the magnet, the frame, and the diaphragm, and the
electromechanical conversion of the low frequency signal in response to the low frequency
signal. A speaker unit including a speaker unit that vibrates the diaphragm to generate and emit
sound waves from the front surface of the diaphragm, and is fixed to the speaker unit via the first
buffer member, the diaphragm A speaker housing having a structure substantially covering the
speaker unit except the front surface of the speaker unit and having a hollow housing shape
closed with a surface including a continuous curved surface, and fixed to the center of gravity of
the back surface of the magnet of the speaker unit; A rod-shaped member extending in the rear
direction, and a part of the speaker casing are penetrated and fixed via the second buffer
member, and the rod-shaped member is supported on a support plane And a support member.
Therefore, according to the present invention, the transmission of the mechanical vibration
generated by the speaker unit to the speaker housing is attenuated and suppressed, and the
machine transmitted from the speaker housing to the speaker unit vibrated by the back surface
sound pressure of the speaker unit Vibration can also be damped and suppressed.
In addition, while the speaker unit is fixed to the speaker housing via the first buffer member, the
support rod is fixed to the speaker housing via the second buffer member, so the airtightness
inside the housing can be improved. As a result, the increase in sound pressure of the resonant
bass portion is suppressed, and high-quality reproduced sound can be obtained.
[0049]
In the above speaker device, preferably, the rod-like member penetrates a portion of the speaker
housing and is fixed to the speaker housing via a third buffer member. Therefore, the air
tightness inside the housing can be enhanced, and as a result, the increase in sound pressure of
the resonant bass portion can be suppressed, and high-quality reproduced sound can be
obtained.
[0050]
Furthermore, in the above speaker device, preferably, the rod-shaped member is fixed to the rod-
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shaped member to which the speaker unit and the speaker housing are fixed, and the supporting
point of the supporting member for supporting the rod-shaped member. It further comprises a
weight for holding in a dynamic equilibrium state. Accordingly, the speaker unit and the speaker
housing can be stably held and supported in a static equilibrium state.
[0051]
Still further, in the above speaker device, preferably, the material of the speaker casing is
expanded polystyrene, balsa, or scissors. Therefore, the damping speed of the vibration inside the
housing can be increased, and acoustically excellent characteristics with less vibration noise can
be obtained.
[0052]
Further, in the above speaker device, preferably, the frame of the speaker unit is attached to the
speaker casing in a smooth shape without unevenness. Therefore, the reflection of the sound
wave emitted from the speaker unit can be significantly reduced, and high-quality reproduced
sound can be obtained.
[0053]
Furthermore, in the above-mentioned speaker device, preferably, the above-mentioned casing
shape is a spherical shape, an oval sphere shape, a spherical deformed shape, or an egg shape.
Therefore, it is possible to reduce the displacement vibration such as plate vibration, and to
obtain an acoustically superior property such as the ability to use a light and thin material
because the rigidity due to the shape is high, and the damping speed of the vibration can be
increased. Can. In addition, the generation of standing waves can be reduced compared to a box
shape, and in particular, since there are few opposing surfaces of the same distance in the shape
of an egg, the generation of standing waves can be suppressed to a very low level. Performance
can be obtained.
[0054]
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Still further, in the above-mentioned speaker device, preferably, a baffle portion which is a part of
the speaker casing located outside the speaker unit can be seen when the speaker device is
viewed from the front of the speaker unit. The shape is such that the shape of the casing reduces
the area of the baffle portion to substantially zero. Therefore, noise radiated from the front of the
case can be reduced, and the fidelity of the reproduced sound generated by the diaphragm can
be enhanced.
[0055]
Furthermore, in the above speaker device, preferably, at least one of the rod-like member and the
support member is provided with a buffer member for attenuating longitudinal wave vibration by
changing the mechanical impedance. Therefore, the mechanical impedance can be suddenly
changed, longitudinal wave vibration can be attenuated, and the quality of reproduced sound can
be improved.
[0056]
Brief description of the drawings
[0057]
FIG. 1 is a side view of a longitudinal cross section showing a structure of a speaker device
according to an embodiment of the present invention.
[0058]
FIG. 2 is a side view of a longitudinal cross section showing a detailed structure around a speaker
unit 1 of the speaker device of FIG. 1;
[0059]
Explanation of sign
[0060]
DESCRIPTION OF SYMBOLS 1 ... Speaker unit, 2 ... Magnet, 2 m ... Center-of-gravity point of
magnet back, 3 ... Frame, 4 ... Diaphragm, 5 ... Buffer member, 6 ... Rod member, 7 ... Weight, 8 ...
Thread groove, 9 ... Screw, DESCRIPTION OF SYMBOLS 11 ... Speaker housing, 12 ... Housing
rear, 13, 14 ... Screw, 15 ... Support rod, 16 ... Buffering member, 17 ... Nut, 17 ... Thread groove,
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18, 19 ... Buffering member, 20 ... Fixing base, G ... Grand ground .
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