close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2006303675

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 JP2006303675
An object of the present invention is to provide a sufficient rear air pressure so as to obtain
sufficient sound pressure while arranging a vibration motor. A piezoelectric ceramic speaker
portion is disposed between a front air chamber (6) having a sound emission hole and a rear air
chamber (7) having a volume larger than the front air chamber via an airtight elastic member (5).
The flat vibration motor M is attached to at least a portion of the thickness of the printed wiring
board 8 constituting the back air chamber, and the flat vibration motor is partially exposed in the
back air chamber by the printed wiring board. And a speaker drive circuit member. [Selected
figure] Figure 1
Piezoelectric ceramic speaker provided with vibration notification means
[0001]
The present invention relates to a piezoelectric ceramic speaker provided with vibration
notification means suitable for use with a portable device.
[0002]
In recent years, the spread of portable devices has been remarkable, and the speakers used in
these devices have also been changed to microspeakers (electromagnetic acoustic transducers)
that are generally called, and simple piezoelectric speakers have been adopted.
As silent notification means of these portable devices, DC motors are widely used, in which
13-04-2019
1
centrifugal vibration can be easily obtained by an eccentric rotor. The microspeaker
(electromagnetic type) has an advantage that the radial size can be made small, but there is a
problem in thinning because the longitudinal vibration is used. Recently, it has been proposed
that a flat vibration motor be combined as a central pole for receiving the magnetic force of the
excitation magnet of the micro speaker. This has the advantage of eliminating the need for a
space for arranging the vibration motor in the lateral direction of the speaker. (See Patent
Documents 1 and 2) However, since such a motor is a cored type motor, there is a limit to its
thinness, and in any case, the magnetic field of the excitation magnet of the speaker is disliked to
affect the motor side. Especially in the case of a brushless motor in which the magnet rotates,
this effect is large, and it is likely to cause a start-up problem. On the other hand, while a
piezoelectric speaker can be made thin, the radial size tends to be large in order to prevent the
output from dropping, the planar occupied area of the portable device is large, and a vibration
motor is used as a silent notification means. Since these two types of members are separately
provided, there is a limitation in the design of the portable device planarly. It has also been
proposed to mount the piezoelectric element on the case of a flat motor. (See Patent Document 3)
However, such a thing provided with a sound output hole in the motor case and utilizes the
vertical deflection vibration of the motor case, but there is little deflection due to the rigidity of
the case itself, and the front air chamber Is inside the motor, so it is difficult to generate sound
pressure outward. Generally, in order to increase the sound pressure, the piezoelectric speaker
has to be increased in radial size. At present, in order to obtain the sound pressure equivalent to
that of an electromagnetic speaker, it is necessary to configure so as not to hold down the metal
foil even if it attempts to increase the efficiency by thinning the element itself. The limit is about
20 mm in diameter. On the other hand, the vibration motor is designed to be small and thin to
the limit, and one having a diameter of 10 mm and a height of 2 mm can be easily realized while
securing the amount of vibration. [Patent Document 1] Japanese Patent Application Publication
No. 2002-219410 US Patent Application No. 6665416 B1 Japanese Patent Application
Publication No. 2000-70857
[0003]
Therefore, the present invention focuses on the thickness of the flat type vibration motor, and
arranges the vibration motor by devising the arrangement of the motor, so that the rear air
chamber can be sufficiently provided to obtain sufficient sound pressure. It is an object of the
present invention to provide a piezoelectric speaker with a motor.
[0004]
In order to solve the above problems, as shown in claim 1, a piezoelectric ceramic speaker
comprising a piezoelectric ceramic speaker portion disposed between a front air chamber having
13-04-2019
2
a sound emission hole and a rear air chamber via an airtight elastic member. The flat vibration
motor can be attached to the flat portion of the rear air chamber by using at least a part of the
thickness of the housing constituting the rear air chamber.
Specifically, as shown in claim 2, the front air chamber is sealed by an airtight elastic member
other than the sound emission hole, and the housing of the rear air chamber to which the flat
vibration motor is attached is partially formed of a printed wiring board Preferably, the flat
vibration motor is attached to the printed wiring board so that a part of the flat vibration motor
is exposed in the rear air chamber and a speaker drive circuit member is disposed. According to a
third aspect of the present invention, in the piezoelectric speaker portion, the feed terminal
portion may be led out to the side and may be input by a spring contact. Then, according to the
fourth aspect of the present invention, the flat vibration motor is provided with a mounting leg
on the side, is attached to the housing via an elastic body, and air flows in and out through the
flange type mounting leg. It is good to be configured.
[0005]
According to the first aspect of the present invention, since the thickness of the vibration motor
can be partially ignored, a thin piezoelectric speaker can be obtained while combining the
vibration motor. In the second aspect of the invention, the vibration motor and other electronic
components can be attached to the printed wiring board by reflow, so that the assembly becomes
easy. In the third aspect of the present invention, the lead wire is unnecessary and contact type
power feeding can be performed. According to the fourth aspect of the invention, the volume of
the rear air chamber can be substantially increased.
[0006]
A piezoelectric ceramic speaker comprising a piezoelectric ceramic speaker portion disposed
between a front air chamber having a sound emission hole and a rear air chamber having a
volume larger than that of the front air chamber, the piezoelectric ceramic speaker comprising
the rear air chamber The flat vibration motor is attached to the flat vibration motor by using at
least a part of the thickness of the housing constituting the rear air chamber, the front air
chamber is sealed by the airtight elastic member except for the sound output hole, and the flat
vibration is The housing of the rear air chamber to which the motor is attached is partially
formed of a printed wiring board, and the flat vibration motor is attached to the printed wiring
board so that a part is exposed in the rear air chamber and a speaker drive circuit member Is
13-04-2019
3
placed. FIG. 1 is a cross-sectional view of an essential part of a piezoelectric speaker according to
the present invention. Example 1 FIG. 2 is a cross-sectional view of an essential part of another
embodiment of the piezoelectric speaker according to the present invention. Example 2 FIG. 3 is
a cross-sectional view of an essential part of a third embodiment of a piezoelectric speaker
according to the present invention. (Example 3)
[0007]
In FIG. 1, the piezoelectric speaker according to the present invention is a speaker unit S in which
piezoelectric ceramic elements 2 and 3 respectively laminated thinly on both sides of a thin
nickel alloy foil 1 and having silver electrodes printed thereon are bonded. Further, copper foil
electrodes 2a and 3a are disposed on the surfaces of the piezoelectric ceramic elements 2 and 3,
respectively, and are pressed by the adhesive films 2b and 3b to be in contact with the silver
electrodes. By this, since the piezoelectric ceramic is not supplied with power by soldering,
thermal deterioration can be prevented. Here, the copper foil electrode may have a large number
of minute projections formed on the surface in order to avoid contact and damping. The thin
nickel alloy foil 1 is larger than the outer circumferences of the piezoelectric ceramic elements 2
and 3 so that the vibration is not killed, and the outer circumference is relatively extended
through a soft elastic adhesive R such as silicon rubber. It is held by a thick aluminum reinforcing
ring 23, forms the other electrode, and is led out laterally. The housing 4 of the portable device is
formed of a strong magnesium alloy or synthetic resin, and the sound emission hole 4a is
determined in size and number including the effect of preventing the entry of foreign matter and
the sound pressure effect, and this sound emission hole 4a It is desirable to make the portion as
thin as possible as shown in the figure in order to obtain an adequate sound pressure. The
speaker unit is disposed in the housing 4 via a rubber-like elastic body (product name: Polon) 5
having a double-sided pressure-sensitive adhesive member and a ring shape having an airtight
effect. A front air chamber 6 having a sound emission hole 4 a and a rear air chamber 7 having a
printed wiring board 8 on which a vibration motor M is disposed are formed with the speaker
portion S interposed therebetween.
[0008]
The printed wiring board 8 is provided with an attachment through hole 8a to which the
vibration motor M is attached, the electronic member D for driving a piezoelectric speaker, a
vibration motor, etc., and the vibration motor M through the cushion member 8b. It is inserted in
8a, and is mounted by reflow using the flange Ma. The printed wiring board 8 is held at the outer
edge by a bracket 9 constituting the housing 4 and the housing H. A ring-shaped support 8c is
13-04-2019
4
attached to the printed wiring board 8, and the speaker portion S has a ring-shaped rubber-like
elastic body having an airtight effect at the tip of the support via the rubber elastic member 8d. It
is held as if it hit the 5th. In the figure, a plurality of air vents 8e and 8f may be provided to
increase the volume of the rear air chamber compared to the front air chamber. As a result, the
vibrating air pressure generated from the speaker unit is not compressed in the rear air chamber
and is not killed, and a sufficient sound pressure can be obtained. Further, reference numeral 23e
denotes a feed lead for inputting to the piezoelectric elements 2 and 3. The illustration is made of
one of a pair, but is connected to the feed electrodes 2a and 3a. By mounting the vibration motor
M in this manner, the thickness direction can be prevented from being partially sacrificed.
Further, since the cushioning member 8b is interposed in the vibration motor, the centrifugal
vibration is not killed and the bodily sensation vibration is improved.
[0009]
The modification shown in FIG. 2 is a modification of the first embodiment, in which the nonsolder type contact electrode is used as the feeding means. The feed pattern 8g of the printed
wiring board 8 and the feed electrodes 2a and 3a of the speaker unit are both gold-plated and
connected by a coil spring 28 also gold-plated. Here, since the other members are equivalent to
those of the first embodiment, the same reference numerals are given and the description thereof
is omitted. In this way, assembly becomes easy on the device manufacturing side.
[0010]
The one shown in FIG. 3 is one in which the vibration motor is integrated with the speaker unit
via an elastic body for thinning, and the back air chamber mainly uses the side of the vibration
motor, and the electronic member is also It is arranged on the side. That is, although the
arrangement of the speaker unit S1 is the same as that of the first embodiment, since the
vibration motor M1 is about 10 mm having a half diameter with respect to the speaker unit S1
here, it is extended from the side The flange F1 is attached via the elastic member 8b as
described above. Here, it is not necessary to prepare the elastic member 8b all around in order to
secure the volume of the back air chamber B1, and there is no need for airtightness. Here, it is
preferable that the diaphragm constituting the speaker unit is not a metal foil, but a synthetic
resin film 11 with high acoustic effect be provided with wrinkles and undulations in a portion
where the piezoelectric ceramic element is not present. In this way, sufficient sound pressure can
be expected, and the diameter of the piezoelectric ceramic element can be reduced accordingly,
and the overall size can be reduced. Here, since the air vents are opened in the flange F1 and air
flows in and out to the side through the air vents 88e opened in the mounting post, the effective
13-04-2019
5
volume of the rear air chamber can be increased. Even if it is thin, it can secure a sufficient back
air room. The flexible substrates f1 and f2 are used to supply power to the motor M1 and the
piezoelectric speaker unit S1. The thickness direction of the vibration motor is partially cut into
the bracket 99, so the thickness is not sacrificed when the vibration motor is disposed.
[0011]
The vibration motor of the present invention only needs to be a flat type, and since there is no
magnetic field in the speaker portion, a brushless motor that is susceptible to the influence of an
external magnetic field like an electromagnetic speaker can be adopted. In the embodiments
described above, the outer case of the portable device is used as the case, but it may be
separately used as a piezoelectric speaker unit. You may attach such a thing to a mobile phone.
The present invention can take various other embodiments without departing from the technical
idea and features thereof. Therefore, the above embodiment is merely an example and should not
be interpreted in a limited manner. The technical scope of the present invention is shown by the
claims, and is not restricted by the description.
[0012]
It is principal part sectional drawing of the piezoelectric speaker of this invention. (Example 1)
FIG. 6 is a cross-sectional view of an essential part of another embodiment of the piezoelectric
speaker of the present invention. (Embodiment 2) FIG. 7 is a cross-sectional view of an essential
part of a third embodiment of a piezoelectric speaker according to the present invention.
(Example 3)
Explanation of sign
[0013]
S, S1 Speaker part 1 metal foil 11 synthetic resin foil 2, 3 piezoelectric ceramic element 4
housing 5 airtight elastic body 6 front air chamber 7 back air chamber 8 printed wiring board 8e,
8f, 88a, Fa air vent 9, 99 bracket M Vibration motor
13-04-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jp2006303675, description
1/--страниц
Пожаловаться на содержимое документа