close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP4580025

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP4580025
Abstract: A bone conduction speaker with good acoustic characteristics and quality is provided. A
frame having a vibration transmission plate, a pot-shaped yoke fixed to the inner wall of the
frame by a movable support, a magnet fixed to the bottom of the yoke, and at least one side of
the magnet A coil surrounding a part and a coil whose other end is fixed to the vibration
transmission plate. The bone conduction speaker is used by bringing the vibration transmission
plate into contact with human skin. [Selected figure] Figure 1
Bone conduction transducer
[0001]
The present invention relates to a bone conduction transducer and to a bone conduction headset
etc. provided with the bone conduction transducer.
[0002]
As a bone conduction system, a piezoelectric element system, a giant magnetostrictive element
system, and a coil element system are generally known.
Among these, the coil element system is expected to be applied to various applications because it
can be used by being directly connected to the earphone terminal. Conventionally, bone
conduction transducers have been mainly used for hearing aids, but in recent years the demand
for audio applications has increased, and development of bone conduction transducers having
12-04-2019
1
good acoustic characteristics and quality is demanded from various fields. There is. For example,
Patent Document 1 discloses a bone conduction earphone that fixes a coil on the inner surface of
the upper wall of a frame, vibrates magnets arranged inside and outside the coil, and transmits
the vibration through a vibration transmission cushion. It is done.
[0003]
JP 2008-131470 A
[0004]
However, in the case of the method disclosed in Patent Document 1, in which the coil side is fixed
to the frame and the magnet side is vibrated, and the vibration transmitting portion provided on
the magnet side is in contact with the human body, There was a problem.
That is, there is a problem that when the vibration transmitting portion provided on the magnet
side is pressed firmly against the human body in order to increase the sensational volume, the
vibrational motion of the magnet is suppressed and the sensational volume is lowered. In order
to solve this problem, it is possible to adopt a structure in which an appropriate space is provided
between the magnet and the human body to make the magnet vibrate freely, but in the case of
such a structure, unnecessary resonance and airway noise are obtained. There was a bad effect
that would occur.
[0005]
The present invention was made in view of the problems as described above, and it is an object of
the present invention to provide a bone conduction transducer with good acoustic characteristics
and quality.
[0006]
Another object of the present invention is to provide a bone conduction head set and the like
provided with the bone conduction transducer.
[0007]
12-04-2019
2
The bone conduction transducer according to the present invention comprises a frame and a
vibration transmission plate made of a material different from the frame and fixed so as to
contact the head together with the frame on the side of the frame that is directed to the head
when in use. And a bottomed cylindrical yoke fixed to the inner wall of the frame by a movable
support, a magnet fixed to the bottom of the yoke, and one end surrounding at least a part of the
side surface of the magnet and the other end And a coil fixed to the vibration transmission plate.
When the bone conduction transducer is used, the vibration transmission plate and the
surrounding frame are brought into contact with human skin.
[0008]
The bone conduction transducer may further include a weight attached to the magnet.
Further, the weight may be a magnetic body. Further, the height of the side wall of the yoke may
be larger than the sum of the thickness of the magnet and the thickness of the weight.
[0009]
The bone conduction transducer according to the present invention can provide a bone
conduction transducer with good acoustic characteristics and quality.
[0010]
1 is a cross-sectional view representing a cross-section of a bone conduction transducer
according to the present invention.
FIG. 5 is a cross-sectional view showing each part of a bone conduction transducer according to
the present invention. (A) is a schematic perspective view of a headset provided with the bone
conduction transducer shown in FIG. (B) is a schematic view when a person wears the headset
shown in (a).
[0011]
12-04-2019
3
Hereinafter, embodiments of the present invention will be described in detail with reference to
the attached drawings.
[0012]
FIG. 1 is a cross sectional view showing a cross section of a bone conduction transducer 100
according to the present invention.
FIG. 2 is a cross-sectional view showing each part of the bone conduction transducer 100. As
shown in FIG. As shown in FIGS. 1 and 2, the bone conduction transducer 100 is vibrated by the
upper frame 101, the movable support 102, the yoke 103, the magnet 104, the weight 105, the
coil 106, the lower frame 107, and the like. And a transmission plate 108.
[0013]
The upper frame 101 is, for example, a dish-like shape, and is a case member made of a material
such as plastic having a space to be coupled with the lower frame 107 to accommodate the
magnet 104 and other members. At the center of the upper frame 101, an opening 101a for
restricting the movement of the magnet 104 to some extent is provided. By providing the
opening 101a, the same effect as the air duct of the speaker box can be obtained, and the sound
quality can be improved. Further, on the upper frame 101, a plurality of mounting portions 101b
for fixing the movable support 102 are provided, for example, along the outer periphery of the
upper frame 101 at equal intervals.
[0014]
The lower frame 107 is also shaped like a dish, and is a case member made of a material such as
plastic and having a space for receiving the magnet 104 and other members in combination with
the upper frame 101. An opening 107a is provided at the center of the lower frame 107, and a
ring-shaped protrusion 107b is provided to surround the opening 107a. The vibration
transmission plate 108 is fitted inside the projection 101 b to close the opening 107 a of the
lower frame 107.
12-04-2019
4
[0015]
Hereinafter, the entire frame in which the upper frame 101 and the lower frame 107 are coupled
by a mechanical mechanism such as an adhesive or a fitting mechanism is simply referred to as a
frame 109. The lower frame 107 is curved from its opening 107a to a plate-shaped edge 107c.
The curved outer shape of the lower frame 107 enables stable contact with any head shape. The
thickness of the frame 109 is not limited and may be set appropriately according to product
specifications. Also, a decoration or other structure may be provided appropriately on the outside
of the frame 109.
[0016]
The movable support 102 is a support for connecting and fixing the yoke 103 to the upper frame
101, and is, for example, a damper formed by punching a metal plate such as copper by a press.
The movable support 102 has, for example, an annular structure that allows the yoke 103 to be
fitted in the central portion thereof, and further, a plurality of fixed portions 102 a are provided
at positions extending outward from the annular structure. Are provided at equal intervals, for
example. Each of the fixing portions 102 a is fixed to the mounting portion 101 b of the upper
frame 101 by fixing pins or screws 110. The yoke 103 fixed to the movable support 102 can
move up and down in the direction of the upper frame 101 or the lower frame 107 by the
deflection of the movable support 102. In particular, by providing the fixing portion 102 a at a
position extending outward from the annular structure of the movable support 102 and fixing it
to the mounting portion 101 b of the upper frame 101, acoustic characteristics can be improved.
[0017]
The yoke 103 is a bottomed cylindrical shape (so-called pot type) made of a magnetic metal
material such as soft iron, for example, and is a movable support 102 with its bottom portion
103b facing the upper frame 101 side. Is supported within the space of the frame 109 by being
fitted into the annular portion of the frame. A ring-shaped protrusion 103 a is provided on the
side surface of the yoke 103, and the protrusion 103 a is bonded and fixed to the movable
support 102. There is no restriction on the position of the protrusion 103 a on the side surface
of the yoke 103, and it can be appropriately set according to the shape of the frame 109 and the
like. The bottom portion 103 b of the yoke 103 is flat so that the magnet 104 can be attached.
12-04-2019
5
[0018]
The magnet 104 is a cylindrical permanent magnet having a predetermined magnetism. One
surface of the magnet 104 is fixed to substantially the center of the bottom 103 b of the yoke
103 by an adhesive. The diameter of the magnet 104 is smaller than the diameter of the bottom
portion 103 b of the yoke 103, and a ring-shaped space exists between the side surface of the
fixed magnet 104 and the side wall of the yoke 103. The surface fixed to the bottom portion 103
b of the yoke 103 may be either the S pole side or the N pole side of the magnet 104. For
example, the surface of the magnet 104 on the S pole side is fixed to the bottom portion 103 b of
the yoke 103.
[0019]
The weight 105 is a cylindrical weight having substantially the same diameter as the diameter of
the magnet 104, and one surface of the weight 105 is bonded to the other surface of the magnet
104 with an adhesive. The weight 105 is, for example, a magnetic substance such as iron oxide,
chromium oxide, cobalt or ferrite. Usually, the diameter of the weight 105 is the same as the
diameter of the magnet 104, but may be relatively large or small as needed.
[0020]
By changing the size (or mass) of the weight 105, the substantial mass of the magnet 104 can be
changed. For example, the mass can be changed by increasing or decreasing the thickness in the
cylinder axis direction of the weight 105. If the substantial mass of the magnet 104 is changed,
the frequency characteristic and the sound quality of the vibration are changed. That is, the
frequency characteristic and the sound quality can be easily changed by changing the size (or
mass) of the weight 105 for each product type. Note that the mass may be changed by further
affixing at least one other weight to the weight 105.
[0021]
The coil 106 is, for example, a so-called voice coil in a cylindrical shape whose one end
surrounds at least a part of the side surface of the magnet 104 and the weight 105 and the other
12-04-2019
6
end is fixed to the vibration transmission plate 108 as shown in FIG. The coil 106 is obtained by
winding an electric wire such as a copper wire by a predetermined number of turns around at
least a part of a cylindrical bobbin 106b made of a material such as plastic or aluminum in order
to obtain a predetermined inductance. Hereinafter, the part is referred to as a winding unit 106 a.
It should be noted that the electric wire wound around the bobbin may be appropriately
embedded in resin and fixed.
[0022]
For example, as shown in FIGS. 1 and 2, the winding portion 106 a is located at the end of the
bobbin 106 b on the magnet 104 side, and at least a portion thereof is between the side surfaces
of the magnet 104 and the weight 105 and the side wall of the yoke 103. It is located along the
formed ring-shaped space. Further, an end (hereinafter, referred to as a fixing portion 106 c) on
the opposite side of the winding portion 106 a is fixed to the vibration transmission plate 108.
The fixing portion 106c is fixed to the vibration transmitting plate 108 by a mechanical
mechanism (not shown) such as a fitting mechanism or a meshing mechanism provided on each
of the fixing portion 106c and the vibration transmitting plate 108.
[0023]
The thicknesses of the magnet 104 and the weight 105 in the direction of the cylinder axis are
appropriately adjusted to obtain desired frequency characteristics and sound quality, so that the
winding portion 106 a is positioned so as to surround only a part of the side surface of the
weight 105. There are also cases where it is positioned so as to surround at least a part of the
side surface of the magnet 104 and all the side surfaces of the weight 105. From the viewpoint of
effectively obtaining the action of the magnetic field, the height h1 of the side wall of the yoke
103 is larger than the sum of the thickness d1 of the magnet 104 in the cylinder axis direction
and the thickness d2 of the weight 105 in the cylinder axis direction. It is preferable to do.
[0024]
A wire cord (not shown) is connected to the coil 106 through, for example, a through hole (not
shown) provided in the upper frame 101, and when power is supplied to the coil 106 through
the wire cord, the magnet 104 The magnet 104 and the coil 106 vibrate at a predetermined
frequency by the action of the magnetic field generated between the and the coil 106.
12-04-2019
7
[0025]
The vibration transfer plate 108 is a diaphragm made of a material such as, for example, a
circular plastic or aluminum having a diameter slightly larger than the diameter of the cylindrical
coil 106, and surrounds the opening 107 a of the lower frame 107. It is fitted into the inside of
the ring-shaped protrusion 101b.
The winding portion 106a of the coil 106 is fixed to one surface of the vibration transmission
plate 108, and transmits the vibration of the coil 106 to the skull via human skin brought into
contact with the other surface of the vibration transmission plate 108. Take a role. The thickness
of the vibration transfer plate 108 is appropriately determined according to the conditions such
as the material.
[0026]
The operation of the bone conduction transducer 100 will be described below.
[0027]
First, the vibration transfer plate 108 of the bone conduction transducer 100 is brought into
contact with, for example, the temple portion of the human head.
At this time, the curved surface from the opening 107a to the edge 107c of the lower frame 107
may be appropriately brought into contact according to the shape of the human head. For
example, a current for generating a vibration corresponding to a sound such as music is supplied
to the coil 106 from a wiring cord (not shown).
[0028]
When current is supplied to coil 106, magnet 104 and coil 106 have a frequency according to
the amount of current and the total mass of magnet 104 and weight 105 by the action of a
magnetic field generated between magnet 104 and coil 106. Vibrates. The magnet 104 fixed to
the bottom portion 103 b of the yoke 103 vibrates mainly along the axial direction of the
cylinder due to the deflection of the foot portion 102 b of the movable support 102. The coil 106
12-04-2019
8
mainly vibrates in the direction of its cylinder axis, and the vibration is transmitted to the
vibration transmission plate 108 fixed to the coil 106 by the fixing portion 106 c.
[0029]
Vibrations of relatively high frequency components are mainly transmitted from the coil 106 to
the vibration transfer plate 108. On the other hand, vibrations of relatively low frequency
components are transmitted to the frame 109 through the movable support 102 mainly by the
vibrations of the magnet 104. These vibrations are transmitted to the skull by the vibration
transmission plate 108 and the frame 109 brought into contact with human skin. The vibration is
transmitted to the skull through human skin, so even a person with a normal auditory nerve can
recognize the sound even if the person is deaf.
[0030]
As described above, in the bone conduction transducer according to the present invention, the
diaphragm is provided on the coil side, and the coil side is in contact with the human head to
transmit the vibration to the skull. In the case of the conventional structure in which an
appropriate space is provided between the magnet and the human body and the magnet is
automatically vibrated, the space generates unnecessary airway sound and as a result, the sound
quality is degraded. On the other hand, by transmitting the vibration to the skull through the
diaphragm coupled to the coil, unnecessary airway noise is not generated, and the pressing
strength of the bone conduction transducer against human skin is also obtained. It is possible to
obtain stable sound quality regardless of whether or not good acoustic characteristics and quality
can be obtained.
[0031]
Further, by adopting the structure of the present invention, the weight can be attached to one
side of the magnet (the side on which the coil is disposed). By changing the size and mass of the
weight for each product type, it is possible to change the substantial mass of the magnet and
easily adjust the desired frequency characteristics and sound quality required for the product. A
cylindrical weight is affixed to one side of the magnet so as to fit within the space inside the
cylindrical coil, and the substantial mass of the magnet can be easily changed by changing the
height of the cylinder of the weight. be able to. Conventionally, in order to change the frequency
12-04-2019
9
characteristics and sound quality, it has been necessary to change the structure and material of
the bone conduction transducer, but according to the present invention, these can be easily
adjusted by changing the size and mass of the weight. Cost savings can be realized. Since the
same purpose of changing frequency characteristics and sound quality can be achieved by
changing the shape and thickness of an inexpensive weight instead of changing the shape and
thickness of a relatively expensive magnet, the cost is further increased. It can be reduced.
[0032]
Further, with the structure of the present invention, the relationship between the height of the
side wall of the pot-shaped yoke and the thickness of the cylindrical magnet and the weight
attached thereto can be freely set. From the viewpoint of effectively obtaining the action of the
magnetic field, it is desirable that the height of the side wall of the yoke be larger than the sum of
the thickness of the magnet and the thickness of the weight.
[0033]
Moreover, by adopting the structure of the present invention, it becomes possible to curve the
outer shape of the frame to be brought into contact with human skin. In the case of a
conventional bone conduction transducer in which the magnet side is brought into contact with
human skin, the shape of the magnet is generally flat, and the contact surface to human skin
must also be flat, and the outer shape of the frame is curved. I could not On the other hand,
according to the bone conduction transducer of the present invention, since the cylindrical coil
side is in contact with human skin, the freedom of formation of the frame on the side to be in
contact can be increased. By curving the outer shape of the frame as in the present invention, it is
possible to make stable contact with any human head shape, and to transmit the vibration
efficiently.
[0034]
FIG. 3 (a) is a schematic perspective view of a headset 200 with the bone conduction transducer
100 shown in FIG. FIG. 3 (b) is a schematic view when a person wears the headset 200. The
headset 200 includes one bone conduction transducer 100 for each of the left and right, which
are connected by a connecting member 210 made of a material such as plastic, for example. The
connecting member 210 is provided with a through hole (not shown) for passing a cord (not
12-04-2019
10
shown) for supplying current, and the cord passes through the through hole and the space of the
connecting member 210 to form a coil. Connected to 106. A current is supplied to the coil 106
by connecting a power supply terminal (not shown) provided at one end of the cord to a power
supply source. As shown in FIG. 3 (b), the headset 200 is usually mounted so that a part of the
connection member 210 is hooked to the ear 300 and the vibration transfer plates 108 of the
left and right bone conduction transducers 100 contact the temples respectively. Ru.
[0035]
In the above embodiment, although the bone conduction transducer 100 is in contact with the
temple portion of the human head, the site to which the bone conduction transducer 100 is in
contact is not limited to the temple portion. That is, any site may be brought into contact as long
as the site is capable of bone conduction.
[0036]
The bone conduction transducer 100 can also be used, for example, in bone conduction
headphones, bone conduction cell phones, bone conduction hearing aids or earphones, bone
conduction transceivers, bone conduction intercoms.
[0037]
Reference Signs List 100 bone conduction transducer 101 upper frame 102 movable support
103 yoke 104 magnet 105 weight 106 coil 107 lower frame 108 vibration transmission plate
109 frame 110 fixing pin (fixing screw) 200 headset 210 connecting member 220 cord 230
power terminal
12-04-2019
11
Документ
Категория
Без категории
Просмотров
0
Размер файла
21 Кб
Теги
description, jp4580025
1/--страниц
Пожаловаться на содержимое документа