close

Вход

Забыли?

вход по аккаунту

?

JP2013085253

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 JP2013085253
Abstract: A transfer device comprising a magnet unit thermally coupled to a heat sink portion of
a device housing. The transfer apparatus includes a speaker driver including a magnet unit, a
housing having a heat sink portion made of a material having high thermal conductivity, and a
thermal component. The heat sink portion has its first side coupled to the speaker driver and the
second side exposed to the exterior of the transfer device. The thermal component couples the
speaker driver to the first surface of the heat sink portion to provide a cooling path from the
magnet unit to the exterior of the transfer device. Other embodiments are also described.
[Selected figure] Figure 3
Speaker magnet temperature control
[0001]
The present invention relates generally to a speaker driver in which a magnet unit is thermally
coupled to a thermally conductive portion of an outer housing of a mobile device in which the
speaker driver is integrated.
[0002]
Currently, a wide range of portable consumer electronic devices that are not dedicated to audio
playback are becoming increasingly important audio capabilities.
These portable consumer electronic devices include, for example, smart phones, laptops,
11-05-2019
1
notebooks, tablet computers, and personal digital media players. These portable consumer
electronics devices often have limitations in both x-y area and z height or thickness, and the
included speaker drivers satisfy the size constraints while providing adequate sound quality It
must be designed as
[0003]
Typically, the speaker drivers of portable consumer electronics devices, such as smart phones, of
course, except for the acoustic output port, include a coil and magnet unit completely surrounded
by a plastic housing called a speaker box. One disadvantage of this configuration is that the coil
generates heat when the audio is played and the plastic housing confines the generated heat to
the speaker driver. When the magnet unit exceeds a predetermined temperature, the magnet unit
is demagnetized, which results in thermal damage to the speaker driver. In order to address this
problem, the magnet unit of the conventional speaker driver is required to use a high
temperature grade magnet. However, high temperature grade magnets can not store as much
flux density as low temperature grade magnets, and conventional speakers using such high
temperature magnets remain insensitive.
[0004]
In one embodiment of the present invention, the speaker driver is housed in a speaker box, and
the speaker box is then installed in the outer housing of a consumer electronic audio device such
as, for example, a mobile telephone. The housing has a heat sink portion made of metal or other
material that appears to be "thermally conductive" than the material of the speaker box. The
speaker driver is coupled to the heat sink portion of the transfer device housing using a
thermally conductive component which is a thermally conductive grease, adhesive or paste. The
heat sink portion is coupled to the speaker driver on one side and exposed to the outside of the
device on the other side. In such a configuration, heat from the speaker magnet unit is
transferred using a cooling path formed from the magnet unit to the exterior of the device.
Therefore, the magnet unit is effectively cooled through the cooling path so that low temperature
grade magnet material can be used.
[0005]
In one embodiment, the speaker driver and the speaker box form a side firing speaker or a
11-05-2019
2
speaker with a side port. The speaker driver comprises a diaphragm, a voice coil coupled to the
diaphragm, and a yoke (also known as a basket or bottom plate). A portion of the back surface of
the yoke is exposed through the opening of the speaker box and coupled to a thermally
conductive portion (e.g., a heat sink portion) of the device housing through a thermal component.
[0006]
Another embodiment is a manufacturing method in which a speaker driver having a magnet unit
is first installed in the speaker box and partially enclosed, leaving a portion of the driver exposed
from the speaker box. The exposed portion of the speaker driver is then coupled to the thermally
conductive portion of the external housing of the consumer electronic audio device using a
thermal component.
[0007]
The above summary does not include an exhaustive list of all aspects of the invention. The
present invention is directed to all systems, apparatus and methods that can be implemented
from any suitable combination of the various aspects outlined above, as well as those disclosed in
the following detailed description and particularly pointed out in the claims. Is intended to
encompass. Such combinations can have certain effects not specifically indicated in the summary
above.
[0008]
Embodiments of the present invention are illustrated by way of example and not limitation in the
accompanying drawings in which like elements are indicated by the same reference numerals.
The “one” and “one” embodiments in the present disclosure are not necessarily the same
embodiments, and mean at least one.
[0009]
FIG. 7 illustrates an example of a portable consumer electronic device specifying a speaker driver
11-05-2019
3
that is limited in size and thickness and typically embodies embodiments of the present
invention. FIG. 5 is a top view of an embodiment of a speaker box and speaker driver. FIG. 1 is a
side view of an embodiment of a consumer electronic device. FIG. 6 is a flow chart illustrating a
method of manufacturing a mobile device with a speaker driver having a magnet unit thermally
coupled to a thermally conductive portion of the mobile device.
[0010]
In the following description, numerous specific details are set forth. However, it should be
understood that embodiments of the present invention may be practiced without these specific
details. In other respects, well-known circuits, structures and techniques are not shown so as not
to obscure the understanding of this description.
[0011]
FIG. 1 illustrates an example of a portable consumer electronic device (or “mobile device”) that
specifies a speaker driver that is limited in size and thickness and that typically embodies the
present invention. As shown in FIG. 1, the mobile device 1 is a mobile telephone communication
device or smart phone, such as an iPhone <TM> device available from Apple Inc. of Cupertino,
California. The mobile device 1 may also be a tablet computer such as an iPad <TM> device, a
personal digital media player such as an iPod <TM> device, or a notebook computer such as a
MacBookAir <TM> device, all of which It is available from Apple Inc. of Cupertino, California. The
device housing 2 (also referred to as the outer housing) encloses a plurality of electronic
components of the device 1. For example, the device 1 includes electronic components such as a
processor, a data storage device including an operating system and application software to be
executed by the processor, a display panel, and an audio codec for providing audio signals to a
speaker driver. As shown in FIG. 1, the rear surface of the device housing 2 has a heat sink
portion 4 made of a material having high thermal conductivity (eg, aluminum). The material of
the heat sink portion 4 appears to be more “thermally conductive” than the material of the
loudspeaker box integrated into the transfer device 1. The device housing 2 has a speaker port 3
(e.g. an acoustic port) located on the bottom side of the device 1. Although FIG. 1 shows mobile
device 1, embodiments of the present invention may be embodied in a non-mobile device such as
a compact desktop computer such as the iMac <TM> available from Apple Inc. of Cupertino,
California. .
[0012]
11-05-2019
4
FIG. 2 is a top view of one embodiment of a speaker box and a speaker driver. In this
embodiment, the speaker box 5 partially surrounds the speaker driver 6 formed in a disc shape
with an acoustic chamber including a speaker port (not shown). The speaker box 5 is made of a
low-conductivity or non-conductive material (eg, plastic) which is relatively inexpensive for
precise manufacturing. The speaker box 5 has an opening, and one side of the speaker driver 6 is
exposed from the opening. By partially surrounding the speaker driver 6, the heat generated
when the audio is reproduced is not captured by the speaker driver 6. Furthermore, when one
side of the speaker driver 6 is exposed, the thickness of the speaker box 5 and the weight of the
speaker box 5 are reduced. In one embodiment, the speaker box 5 and the speaker driver 6 form
a side firing speaker or a speaker with a side port. Therefore, the sound travels in a direction
perpendicular to the thickness of the speaker box 5 measured in the z direction shown in FIG.
[0013]
FIG. 3 is a side view of one embodiment of a transfer device. In this embodiment, the transfer
device 1 comprises a heat sink portion 4 of the housing 2 and a loudspeaker box 5 partially
surrounding the loudspeaker driver 6. The heat sink portion 4 is coupled to the speaker driver 6
on one side using the thermal component 11 and the other side is exposed to the exterior of the
transfer device 1 as shown in FIG. The thermal component 11 is, for example, a thermal grease, a
conductive adhesive or a conductive paste.
[0014]
As shown in FIG. 3, the speaker driver 6 includes a diaphragm 7, a voice coil 8 coupled to the
diaphragm 7, a magnet unit 9 and a yoke 10. A top plate may be included to enhance the
magnetic field of the air gap in which the voice coil 8 is located. The diaphragm 7 is attached at
its outer end to the frame or top plate of the speaker driver 6. The diaphragm 7 acoustically
divides the speaker driver 6 into front and rear volumes. When the audio is played back, the rear
volume communicates with one side of the diaphragm 7 and the other side of the diaphragm 7
directs the sound wave to the outside of the speaker port 3. Referring to FIG. 3, a yoke 10 made
of a magnetic material (for example, iron) is coupled to a magnet unit 9 including a permanent
magnet. Yoke 10 may be formed with any of the typical geometric shapes used. For example, the
yoke 10 is formed as a circle, a rectangle or a square. Since the speaker driver 6 is a mobile
device having a limited thickness, a combination of the speaker box 5 and the speaker 6 forms a
flat speaker such as a side firing speaker or a speaker with a side port, for example. Ru. In this
11-05-2019
5
type of speaker, both the diaphragm 7 and the voice coil 8 move in the z direction, and the sound
wave travels in the direction perpendicular to the z direction. Referring to FIG. 1, the sound wave
exits the mobile device 1 through the speaker port 3 located on the bottom side.
[0015]
As further shown in FIG. 3, the speaker box 5 partially encloses the speaker driver 6 and includes
an opening that exposes a portion of the speaker driver 6. As shown in FIG. 3, a part of the yoke
10 included in the speaker driver 6 is exposed through the opening of the speaker box 5. A
current is applied to the speaker driver 6 for the audio to be reproduced. This generates heat in
the voice coil 8, which is transferred to the magnetic unit 9 to which the voice coil 8 is coupled.
The amount of power applied to the speaker box 5 is limited by the resiliency of the magnet unit
9 to heat. If the magnet overheats, structural or mechanical damage to the magnet will lead to its
demagnetization. The magnet unit 9 is thermally coupled to the heat sink portion 4 of the device
housing 2 in order to reduce the heat of the magnet unit 9.
[0016]
In particular, a portion of the yoke 10 exposed through the opening of the speaker box 5 is
coupled to the heat sink portion 4 using a thermal component 11. The yoke 10 is coupled to the
magnet unit 9 so that the heat of the magnet unit 9 is transferred to the outside of the device 1
via the heat sink portion 4 of the housing 2, the yoke 10 and the thermal component 11. Thus, a
cooling path is formed between the magnet unit 9 and the outside of the device 1. Furthermore,
the thermal component 11 coupling the yoke 10 to the heat sink portion 4 forms a significant
thermal mass, which also reduces the temperature of the magnet unit 9.
[0017]
In this embodiment, the heat of the magnet unit 9 is reduced so that the magnet unit 9 can be
maintained at a lower temperature than a conventional magnet unit. Thus, the magnet unit 9
includes a low temperature grade magnet, and in contrast to the high temperature grade
magnets required to be used in a conventional magnet unit, this low temperature grade magnet
can store high magnetic flux density , Improve the overall sensitivity of the speaker driver 6.
11-05-2019
6
[0018]
The following embodiments of the present invention are generally described as processes
depicted as a flowchart, flow diagram, structure diagram or block diagram. Although the
flowchart describes operations as a sequential process, many operations can be performed in
parallel or simultaneously. Furthermore, the order of operations can be rearranged. The process
ends when its operation is complete. A process corresponds to a method, procedure, etc.
[0019]
FIG. 4 is a flow chart illustrating a method of manufacturing a mobile device with a speaker
driver having a magnet unit thermally coupled to a thermally conductive portion of the mobile
device's housing. The method 400 begins by partially surrounding a speaker driver that includes
a magnet unit in a speaker housing. The partially enclosed speaker driver is partially exposed
from the speaker box (block 401). The speaker box includes an opening that exposes a portion of
the speaker driver. At block 402, the partially enclosed exposed portion of the speaker driver is
coupled to the heat sink portion of the device housing using thermal components. Thus, a cooling
path is established between the loudspeaker driver and the exterior of the mobile device housing.
[0020]
While the invention has been described in terms of several embodiments, those skilled in the art
will appreciate that the invention is not limited to the embodiments described herein but can be
practiced with modification and alteration within the spirit and scope of the claims. It will be
clear. Accordingly, the above description should be regarded as illustrative rather than limiting.
There are numerous other variations to the different aspects of the invention described above,
but have not been described in detail in the interest of brevity. Accordingly, other embodiments
are within the scope of the following claims.
[0021]
1: Equipment 2: Equipment housing 3: Speaker port 4: Heat sink part 5: Speaker box 6: Speaker
driver 7: Diaphragm 8: Voice coil 9: Magnet unit 10: Yoke 11: Thermal component
11-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jp2013085253
1/--страниц
Пожаловаться на содержимое документа