JP2005184100

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DESCRIPTION JP2005184100
PROBLEM TO BE SOLVED: Different from the case where rotational vibration can be used as it is,
it may be said that it is industrially advantageous to convert it into linear vibration. Acoustic
speakers are one of the typical ones. In particular, the industrial structure itself is configured on
the basis of the linear motion for a large-amplitude bass. An object of the present invention is to
convert the reciprocating motion of a rotational vibration source into linear vibration in order to
make use of available portions of the conventional industrial paradigm and to reproduce highquality bass. SOLUTION: The present invention is characterized in that rotational vibration is
converted to linear movement of a rigid member by using a pulley and a flexible member. As a
result, in place of the voice coil, sound reproduction, particularly high-quality sound reproduction
of bass, can be provided at a competitive cost. [Selected figure] Figure 1
Rotational vibration linear conversion system and manufacturing method thereof, vibration
transmitting device, speaker device, speaker system, and manufacturing method of speaker
device
[0001]
The present invention relates to a mechanism for accurately transmitting a force from a
rotational movement to a rigid body performing a linear movement. In particular, the invention
relates to an application that reproduces a large amplitude without distortion in a reciprocating,
separately even a speaker for sound reproduction.
[0002]
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The present invention relates to a mechanism that converts rotational vibration into linear
vibration in a system that generates vibration by a rotary vibration generator. In particular, the
present invention relates to a vibration transfer device in a speaker device / system, a rotational
motion linear conversion system, and a method of manufacturing the same.
[0003]
Currently, commonly used speakers reproduce voice signals by a mechanism called a voice coil.
The principle is the same as a general electromagnetic motor and is a kind of hollow (coreless)
type. However, the operation is different, but the voice coil moves in a straight line while the
normal motor generates rotational force. This is based on a long history in the sound industry
and has become a well established paradigm. As a result, most of the speakers go straight and
have an industrial structure to play audio signals.
[0004]
These speakers are called dynamic type, and according to Fleming's law, force is generated when
voice current flows in the voice coil in the magnetic field. The force is reciprocating, and is
directly transmitted to a diaphragm called a cone to cause reciprocating. Also, in order to keep
the voice coil in the magnetic field, it is held so as to have only freedom in rectilinear movement
by a zero point holding called a spider and by the damper mechanism and the edge material of
the cone. As mentioned earlier, this system has become the de facto standard at the world level,
and the speaker is dominated by the established concept of moving objects in a straight line.
[0005]
However, for sound reproduction, there is no restriction that it has to go straight. In fact,
speakers that reproduce sound as they are in rotational motion are also sometimes found, and for
example, rotary speakers of US Cyclone, etc. can sufficiently fulfill this task (see, for example,
Patent Document 1). However, when constructing a system with practicality such as cost
competitiveness, it is important whether or not the existing industrial structure can be utilized. In
other words, a large number of diversion parts are directly linked to the cost. Therefore, even if
the original vibration is generated by the rotational movement, the technology of converting
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straight to straight without any restriction on the characteristics becomes extremely important
practically. In particular, a speaker that reproduces a bass needs to put in and out a large amount
of air, and the amount is directly related to the output of the speaker. Specifically, the amount of
air is determined by the aperture (area) of the diaphragm and the movement distance, and the
movement amount may be small if the diameter is large, but a movement amount of 10-30 mm is
required if the diameter is small. Therefore, the distortion removal accompanying the straight
advance becomes indispensable.
[0006]
However, the prior art is limited and in each case there are performance limitations. The
rotational movement is directly converted to reciprocating movement by the arm (see, for
example, Patent Document 2). Furthermore, an example is also shown in which the rotational
movement is converted into the linear movement by the belt. On the other hand, Servo Drive Co.,
Ltd. drives two speakers simultaneously with a belt drive to minimize the influence of couple.
Although this idea is shared in the inventor's prior patent, placing several speakers on the front
and back simultaneously requires some contrivance for practical use (see, for example, Patent
Document 3). ).
[0007]
On the other hand, in the pulley method, in order to hold the drive shaft, a holding member is
disposed up to the front of the speaker (see, for example, Patent Document 4). Naturally, it is a
structure not found in the conventional paradigm. Furthermore, the following description is given
in this prior example. That is, "The motor 3U uses a microminiature DC motor, and the axis of
this motor 3U is said to be fitted with a pulley 4U having a large diameter so as to move the
diaphragm 2 up and down with as little rotation as possible." . However, according to the findings
of the present inventors, the microminiature DC motor is suitable for high-speed rotation but has
small torque and can not obtain a force for driving a very large diameter pulley.
[0008]
The necessity of the couple processing in the above depends on the size of the drive diameter
and the amount of rotation. By the way, what is described as the couple processing is the
prevention of deviation of couple moments generated from the transmission mechanism of the
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rotational force. If the deviation can not be neglected, as a result, a nonparallel force is applied to
the rotation axis, which leads to the generation of abnormal noise and the shortening of the life.
In the case of the prior art, the electromagnetic motor, which is the drive source, has high speed
and low torque, and in order to obtain a sufficient output, the drive diameter is necessarily small
and the amount of rotation is large. As a result, the couple moment is small, and the points of
force are dispersed in the circumferential direction, and as a result, the couple processing
becomes unnecessary.
[0009]
That is, even in the prior art, there is a technology for converting rotational vibration into linear
vibration, but in any case, distortion is inherently inherent, or it is difficult to apply the present
paradigm even if distortion is not inherent. Do. Under this condition, the technical substrate of
the straight-ahead type speaker accumulated for more than half a century can not be used,
resulting in a high price and unnecessary characteristic deterioration. Japanese Patent
Publication No. 5-79000 U.S. Pat. No. 4,564,727 Japanese Patent Laid-Open No. 2000-225377
Japanese Patent Laid-Open No. 2000-152392
[0010]
The object of the present invention is to remedy the drawbacks of the prior art. Specifically, the
technical idea will be clarified here, though it is left to the embodiment described later. First of
all, the aim of the present technology is to minimize the performance deterioration due to the
straight movement. The second is to facilitate the incorporation of the prior art by selecting a
means for straightening. Thirdly, the present invention aims to integrate or remove functions that
can not be achieved by the prior art.
[0011]
First of all, to minimize the performance degradation due to straight ahead. Generally, by
converting rotational motion into straight movement, it is possible to join the conventional
paradigm, but usually the following characteristic deterioration occurs. For example, in Japanese
Patent Application Laid-Open No. 8-79896, although a direct connection is made by a plate
spring, the distortion increases at an accelerating rate as the amplitude increases. In particular,
the increase in harmonic distortion is remarkable, which causes a hearing problem in the
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speaker. On the other hand, when the above distortion is avoided and transmitted by a gear, play
and gear noise occur, which also causes another type of distortion. It should be noted that the
pulleys and belts that do not have this type of distortion are premised on special configurations,
and as a result, they also generate a paradigm mismatch.
[0012]
Then, when the purpose and conditions of going straight ahead are examined again, an approach
that has conventionally been overlooked can be seen. That is, simultaneously achieving the
elimination of non-linearity, the elimination of play, and the elimination of special configurations
involved in transformation. By the way, if the above three methods are evaluated from this
viewpoint, the leaf spring is intrinsically non-linear strain, and the gear is intrinsically strain due
to play. On the other hand, the aforementioned pulleys and belts are strain-less but produce
paradigm mismatches.
[0013]
The above analysis gave a clear guide to the present invention. That is, basically, the mechanism
underlying distortion does not use it regardless of how good it is on the other side. The
remaining method is how to match strainless means such as pulleys and belts to the present
paradigm.
[0014]
The present invention is based on tension-based linear translational conversion of a flexible
material used in pulleys / belts, and is a novel translational linear translational mechanism
having a configuration integrated with a rigid body in order to match the current paradigm. First,
the flexible member is driven without play by a pulley directly connected to the rotating body. Up
to this point, it is equivalent to the prior art. A feature of the present invention is to integrate
both ends of the flexible member with a rigid member such as a rod. As a result, the
reciprocating vibration of the rotating body is converted to the rectilinear reciprocating motion
of the rigid member. With this configuration, the system conforms to the conventional paradigm,
that is, the industrial structure, and manufacture is easy. Therefore, it is advantageous in cost and
the practicability is enhanced.
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[0015]
Further description will be continued regarding the couple processing in the present invention.
As mentioned above, couple processing is essential for noise reduction and life extension. In the
present invention, as in the case of the above-mentioned Japanese Patent Application Laid-Open
No. 2000-225377, the low speed and high torque rotational drive source and the ultrasonic
motor are firstly considered. Inevitably, the amount of rotation is limited and as a result, the
pulley also becomes large and the couple moment is large. Moreover, the reciprocation within a
limited angle localizes the force point around the circumference near the open point. Therefore,
in order to apply tension to the flexible member, and as a result, to disperse the force points,
tension addition and action points are provided at symmetrical positions of the action points.
Moreover, by controlling the coefficient of friction between the pulley and the flexible member,
as a result, the couple of forces around the rotation axis is balanced, and becomes a practical
range.
[0016]
As described above, the present invention eliminates the disadvantages of the prior art and yet
provides a mechanism that is consistent with the current paradigm. As already described in
Japanese Patent Application Laid-Open No. 2000-225377, the ultrasonic motor has excellent
low-pitch characteristics not found in the conventional products, but since it is a rotational drive,
simple replacement is impossible. According to the present invention, even a rotary drive source
can be replaced with a conventional straight drive without any deterioration. In the case of cars,
for example, the chassis was the same, and it became possible to replace only the engine with a
more sophisticated one.
[0017]
The present invention can solve the above-mentioned problems by providing the following
configuration.
[0018]
(1) In a system for converting rotational vibration from a rotational drive source into
corresponding linear movement, a pulley driven by a rotating portion, a flexible member partially
wound around the pulley, and a main body of linear movement A rotary vibration linear
conversion system comprising: a rigid member; and a joint for operating the flexible member and
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the rigid member integrally.
[0019]
(2) The rotational vibration linear conversion system according to (1), characterized in that, in
the system, a spring member which always applies tension to the flexible member is
simultaneously involved.
[0020]
(3) In the above-mentioned system, a couple of points such as a drive point, an action point, a
springiness imparting point, etc. are subjected to a couple process so as to suppress the
generation of an unbalanced couple moment between the flexible member and the rotor. The
rotational vibration linear conversion system according to (2).
[0021]
(4) In the above system, the rotational vibration linear conversion according to any one of (1) to
(3), wherein a plurality of rotational drive sources are simultaneously used for one rigid member
to obtain a larger output. system.
[0022]
(5) In the above system, when a plurality of rotational drive sources are arranged on the rigid
member, the rotational drive sources are arranged symmetrically on the axis of the rigid member.
Rotational vibration straight conversion system as described.
[0023]
(6) The rotational vibration linear conversion system according to any one of (1) to (5), wherein
in the system, the acoustic speaker is driven by the rigid member.
[0024]
(7) The speaker system for sound according to (6), which is the system, wherein a plurality of
rotational vibration linear conversion systems are simultaneously used.
[0025]
(8) In the system described above, when a plurality of rotational vibration linear conversion
systems are simultaneously used, the arrangement thereof is arranged symmetrically with
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respect to the center of the speaker. Speaker system.
[0026]
(9) The rotational vibration linear conversion system according to any one of (1) to (5), wherein
an ultrasonic motor is used as the rotational drive source.
[0027]
(10) The rotational vibration linear conversion system according to any one of (1) to (5), wherein
a metallic member such as a piano wire or a metal stranded wire is used as the flexible member.
[0028]
(11) The rotational vibration linear conversion system according to any one of (1) to (5), wherein
a damping property member, a hollow metal pipe or the like is used as the rigid member.
[0029]
(12) In the above-mentioned system, an ultrasonic motor is used as a rotational drive source, and
a pulley is directly attached to the rotor thereof.
[0030]
(13) In the above-mentioned system, when attaching a pulley, a vibration damping property is
imparted.
[0031]
(14) The method of manufacturing a rotational vibration linear conversion system according to
the above (12), characterized in that, in the system described above, vibration damping property
is imparted when attaching a pulley.
[0032]
(15) When attaching the rotary vibration linear conversion system described in any one of the
above (9) to (14) to a diaphragm, a means for reducing harmonic distortion is provided.
Loudspeaker manufacturing method.
[0033]
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(16) A speaker manufacturing method characterized in that vibration damping property is
imparted when the rotary vibration linear conversion system described in any one of the above
(10) to (15) is attached to a casing. .
[0034]
According to the present invention, the rotational vibration of the rotational drive source is
converted into the linear movement of the rigid member without distortion.
As a result, the rotational vibration force from the rotational drive source, which could not be
achieved by the prior art, can be used as a linear vibration source directly linked to the paradigm
of the conventional acoustic device.
Moreover, the spiders conventionally required are no longer needed.
As a result, it has become possible to provide audio equipment at a competitive cost that greatly
improves the disadvantages of the conventional voice coil type bass speaker.
[0035]
Moreover, in order to obtain a larger output according to the present invention, it is also possible
to dispose a plurality of rotational drive sources for one (straight forward) rigid member.
That is, the rotational drive source is disposed at a symmetrical position with respect to the axis
of the rigid member.
In FIG. 3, there are shown two cases in which two rigid members are arranged axisymmetrically
and four cases.
[0036]
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Furthermore, according to the present invention, by simultaneously using a plurality of the same
drive sources, which was difficult in the conventional voice coil type, it is possible to easily
perform multipoint drive of the large area diaphragm.
Conventionally, large-sized voice coils have been developed for large-area drive.
Naturally, a large magnetic circuit was required, and the weight and the cost increased in series.
However, according to the present invention, by arranging a plurality of small drive sources on
the large-area diaphragm, the weight and the cost only increase in proportion to the number.
[0037]
By combining the method of arranging a plurality of rotational drive sources in one rigid member
and the case of arranging a plurality of linear drive sources to the diaphragm in this way, many
variations from a single rotational drive source are possible. Drive power is rich.
This is what has never been possible with conventional voice coil speakers.
Thus, the frequent use of common parts contributes to further cost reduction.
This is a ground-breaking advantage not seen in the conventional paradigm.
[0038]
It is also useful to further reduce unnecessary harmonic distortion when the driven rigid member
is joined to the speaker diaphragm by the rotational motion linear conversion system as
described above.
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Various damping adhesives and bonding methods can be used.
[0039]
The present invention will be specifically described below.
[0040]
FIG. 1 is a diagram showing the principle of a pulley / rod-type rotary rectilinear conversion
mechanism.
(1) is a rotary drive source, (2) is a pulley and a flexible member, and the latter is wound around
the former.
(3) is a rigid member, and (4) connects the flexible member free end of (2) and the rigid member
of (3) at both ends.
In this configuration, the rotational drive source of (1) is necessarily fixed to a housing (not
shown in the figure).
In addition, at the time of attachment of rotation drive source itself, unnecessary vibration is
removed by providing damping property.
In addition, the rigid member of (3) is directly connected to a diaphragm (not shown in this
figure).
Furthermore, the rigid member of (3) is a support member which is also omitted, and the
freedom of only linear movement is guaranteed. With such a configuration, the rotational
movement is converted without distortion into the linear movement of the rigid member. As a
result, the rotational vibration corresponding to the sound signal produced by the rotational
drive source is precisely converted to the reciprocating vibration of the loudspeaker diaphragm
through the rigid member. The present invention eliminates so-called spiders. The spider has
three functions: 1) hold the central axis, 2) limit the vibration range, and 3) hold the zero point.
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Naturally, it causes an inevitable distortion in the vibration. In the present invention, the
functions 1) and 3) of the spider are handled by the support member and the drive signal control
portion, and as a result, the 2) mechanical damper function which is the source of distortion can
be excluded.
[0041]
The basic principle has been described above with reference to FIG. Here, the description of the
embodiment will be made with reference to FIG. (1) is a rotational drive source. (2) is a drive
point directly connected to the rotational drive source, and is an action point for transmitting
rotational vibration to the flexible member of (3). This (2) drive point is disposed at the point
symmetrical position of the rigid member to suppress the generation of unnecessary couples.
The springy fulcrum of (4) applies the necessary tension to the flexible member. This serves to
maintain the necessary tension so that the flexible member can accurately convert rotational
vibration into linear movement when converting rotational movement into linear movement. (5)
is a rotary support, and (1) transmits force at pinpoint, while supporting the flexible member at a
wide range of area extending about 120 degrees. (6) The coupling portion and (7) the rigid
member are equivalent to the above-described principle diagram 1.
[0042]
Each member arranged as described above works as follows. First, the rotational drive source in
(1) assumes an ultrasonic motor. The rotational driving point of (2) is an operating point
provided on the rotor or pulley, and functions to transmit the rotational movement reliably to the
flexible member. As mentioned above, it is located at the opposite pole of the rigid member to
take account of couple processing. As a result, the flexible member of (3) performs linear
movement corresponding to the rotational movement, but can not transmit to the rigid member
as it is. The reason is that the flexible member often creeps when it is repeatedly stressed.
Therefore, even if it is coupled to the rigid member as it is, slack will eventually occur, and as a
result, accurate vibration transmission will not be possible.
[0043]
Therefore, in order to always keep the flexible member slack. The spring-loaded fulcrum of (4) is
arranged. The spring force must be much greater than the rotational drive force. Otherwise, the
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springy fulcrum reacts with each rotational vibration, and the original driving force transmission
can not be performed. In other words, it plays the role of taking up slack and keeping the
necessary tension at all times like a reel used in fishing. To that end, the rotary support of (5) is
not just part of the pulley. The rotary support is set to have a suitable coefficient of friction with
the flexible member. This is to indirectly transmit the function of the springy fulcrum of (4) to the
rigid member. Further, the positional relationship with the springy support portion of (4) is
disposed at a position symmetrical to the end portion of the rotation support portion (5) to
prevent the generation of an unnecessary couple. These considerations are to prevent generation
of unnecessary couples with respect to the rotational center as much as possible when the
rotational drive source is viewed realistically. All are based on the above-mentioned couple
processing. As apparent from the present structure, the present invention considers that the
required amount of rotation is at most 1/3 or less. In the case of the amount of rotation more
than this, it can respond by a prior art.
[0044]
Further, in practicing the present invention, representative examples of each member are shown.
First, the rotational drive source of (1) uses an ultrasonic motor. When attaching a pulley, it is
also effective in providing unnecessary vibration control to give damping property. Further, it is
also useful to reduce unnecessary high frequency distortion by directly connecting the pulley to
the rotor to prevent unnecessary twisting. Of course, various electromagnetic motors can also be
used, but as described above, torque is insufficient for high rotational speeds, and in this case, it
is necessary to relatively reduce the diameter of the pulleys. The driving point of (2) may be an
ordinary metal or the like, and the flexible member of (3) is preferably a piano wire, a metal
stranded wire, a high tension fiber such as nylon (registered trademark), a polyimide, a carbon
fiber or the like. It is a major premise that the springy fulcrum point of (4) can apply much higher
tension than the force generated from the torque by the rotational drive source. Various ordinary
spring materials can be used as the material. The rotation support portion of (5) is originally a
part of the pulley. Moreover, in order to always distribute the aforementioned tension all over, it
requires moderate sliding friction. Although it depends on the balance with the flexible member
of (3), bearing members such as various metals and Delrin can be used. The joint portion of (6)
only needs to be able to fix (3) and (7) firmly. The rigid member (7) must first bear the tension of
the flexible member of (3) and have a light weight function to transmit the linear vibration to the
speaker diaphragm. Various metal pipe materials can be used. Furthermore, it is also desirable
that the rigid member has a function of absorbing unnecessary vibration from the drive source,
and utilization of various damping members is also useful.
[0045]
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Pulley / rod type rotary motion straight line conversion mechanism principle diagram example
explanation example explanation figure explanation concerning multiple rotary drive source
arrangement to the rigid member
Explanation of sign
[0046]
DESCRIPTION OF SYMBOLS 1 rotation drive source 2 drive point 3 flexible member 4 springy
fulcrum 5 rotation support part 6 coupling part 7 rigid member
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