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JP2005086490

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DESCRIPTION JP2005086490
The present invention provides a deep bass speaker capable of being mounted on a display
device by effectively utilizing a limited space on the display device. SOLUTION: A deep bass
speaker (2) for a display device according to the present invention is disposed on the back of the
display panel (11) of the display device (1) or on a pedestal (14) or a column (13) supporting the
display panel. Use of the display panel or the decorative plate (15) or cover (12) of the base or
support as the diaphragm (22) And generating a deep bass. [Selected figure] Figure 1
Heavy tone speaker for display
[0001]
The present invention relates to a deep bass speaker attached to and used in a display device
such as a personal computer, and more particularly to a deep bass speaker for a display device
suitable for a thin display device such as a liquid crystal display device or a plasma display
device.
[0002]
Recently, high quality sound has come to be required also for speakers for information
processing devices such as personal computers.
As part of the advancement of such sound quality, there is a tendency to add heavy bass speakers
(woofers and subwoofers) to conventional treble and midrange speakers. Since such a low-
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pitched speaker is difficult to miniaturize even if it is for small output, it is often added as a
separate body from a stationary PC or display device, etc., and is often arranged on a desk, etc. It
is necessary to devise to incorporate it into a display device or the like.
[0003]
The applicant filed a patent application for a panel-type speaker that uses a protective cover
configured of a light-transmissive flat plate as a diaphragm for a display surface of a thin display
device (Patent Document 1). In this panel type speaker, the tip end surface of the bobbin of the
movable wire ring type exciter is fixed to a flat plate (panel) such as a protective cover of a thin
display, and high-quality flexural vibration is excited on the flat plate by back and forth
movement of the bobbin It has become. Japanese Patent Application No. 2003-163314 (FIGS. 2
to 4)
[0004]
The panel type speaker disclosed in the above-mentioned patent document 1 is used as a speaker
with higher priority in the middle-high range. For this reason, there is a problem that
components such as a protective cover on the front surface of a thin display device optimal as a
diaphragm of a panel type speaker, and a space on the front side can not be allocated to a deep
bass speaker. Therefore, one of the problems to be solved by the present invention is a heavyduty display device that can be mounted on a personal computer or the like by effectively using
the limited space and limited components on the display device. To provide a bass speaker.
[0005]
The deep bass speaker for a display device according to the present invention, which solves the
problems of the prior art, is disposed on the back of the display panel of the display device or on
a pedestal or a support for supporting the display panel It is characterized in that it is a panel
type speaker of an excitation type, the display panel of this display device, a base, a decorative
plate or a cover of a support, or a diaphragm is used as a diaphragm, and generation of deep
bass.
[0006]
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The heavy bass speaker for display devices according to the present invention is a speaker for
middle to high tone by utilizing the property of sound wave that the position of the sound source
hardly matters from the viewpoint of directivity for long wavelength sound such as heavy bass. It
is installed on the back of a display device or a pedestal or a post not suitable for the installation
place of.
Therefore, it becomes easy to secure a limited free space, and mounting on a display device
becomes possible.
[0007]
According to the preferred embodiment of the present invention, the bass speaker using the
decorative plate as the diaphragm is detachably attached to the display panel, the pedestal or the
column together with the decorative plate.
[0008]
1 and 2 are a side view (shown by a partial sectional view) and a rear view showing a deep bass
speaker for a display device according to an embodiment of the present invention together with a
liquid crystal display device to be mounted.
The liquid crystal display device 1 to be mounted is a stationary type that includes a liquid
crystal display panel 11, a back cover 12 of the liquid crystal display panel, a support 13, a
pedestal 14, and a decorative plate 15. The deep bass speaker 2 is mounted on the back of the
liquid crystal display panel 11.
[0009]
The exciter 21 of the bass speaker 2 is disposed between the back cover 12 of the liquid crystal
display panel and the decorative plate 15. The diaphragm 22 excited by the exciter 21 uses the
decorative plate 15 on the back of the liquid crystal display panel 11. The exciter 21 is formed of
a movable wire ring type element, and is wound by an electromagnetic force generated when an
AC electric signal flows through a voice coil disposed in a gap of a magnetic circuit including a
permanent magnet. Drive the bobbin back and forth. The rear side surface portion of the exciter
21 is fixed to the back cover 12 of the liquid crystal panel via a soft cushion material 24 such as
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soft rubber. The tip end surface of the bobbin of the exciter 21 is adhesively fixed in the vicinity
of the central portion of the rectangular diaphragm 22 using the decorative plate 15 on the back
surface of the liquid crystal display panel. The peripheral portion of the diaphragm 22 is fixed to
the four corners of the back cover 12 of the liquid crystal display panel with a cushion material
23 such as soft rubber interposed.
[0010]
Due to the back and forth movement of the exciter 21 excited in the vicinity of the central
portion of the diaphragm 22, flexural vibration of a high-quality bass region is excited on the
diaphragm 21. The frequency of this vibration is in the deep bass range of about several
hundreds Hz or less, so the directivity is hardly a problem. That is, the deep bass emitted toward
the back of the display 1 from the bass speaker mounted on the back of the display 1 is reflected
by various reflective objects present behind the display 1. Propagating forward. As a result, a
large number of reflected waves that are out of phase with each other are transmitted through
various propagation paths (multipaths) having different lengths according to the distances from
the display device 1 to various reflective objects present behind the display device 1 Propagating
forward. As a result, the audio signal in which the multiple reflected waves are combined is heard
by the user in front of the display device 1.
[0011]
Assuming that the audio signal that reaches the user's ear through such a process is not a deep
bass, but a mid-high frequency audio signal, a large number of reflected waves passed through
multipaths because the wavelength is shorter than the deep bass. The phase shift between them
is a large value. As a result, the synthesized voice signal becomes an unclear sound with a dull
waveform, which makes listening difficult. However, in the case of a deep bass, since the
wavelength is long, the phase shift of the voice signals passing through the multipaths is small,
and the waveform of the voice signal combined with these is clear with hardly any distortion.
[0012]
In addition, the user can not sense the position of the sound source because the deep bass
reaching the user's left and right ears has a small phase difference between each other.
Therefore, the user does not feel uncomfortable that the deep bass is a sound emitted from
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behind the display device. Thus, this deep bass speaker for a display device uses the property of
the sound wave that the phase shift of each component is small and the position of the sound
source is hardly a problem for a long wavelength sound such as a deep bass. , It becomes
possible to mount a speaker using the space of the back of a display.
[0013]
FIG. 3 is a cross-sectional view showing an enlarged portion of the mounting location of the deep
bass speaker 2 of FIG. The rear side surface portion of the exciter 21 is attached to the back
cover 12 of the liquid crystal display panel via an annular cushion 24. The four corners of the
rectangular decorative plate 12 used as the diaphragm 22 of the panel type speaker are fixed to
the back cover 12 via a soft columnar elastic material 23 made of soft rubber, polyurethane or
the like. ing.
[0014]
FIG. 4 is a cross-sectional view showing the configuration of a deep bass speaker for a display
device according to another embodiment of the present invention. In FIG. 4, components having
the same reference numerals as those in FIGS. 1 to 3 are the same components as those
described above with reference to the respective drawings. In this embodiment, the exciter 21 is
fixed to the decorative plate 15 in a suspended state by adhesively fixing the tip end surface of
its bobbin to the diaphragm 22 using the decorative plate 15.
[0015]
That is, the rear portion of the exciter 21 is inserted into the opening formed in the back cover
12 of the liquid crystal display panel while forming a gap with the inner wall surface. A cushion
23 'of a cylindrical soft elastic material is fixed by an adhesive in a circular recess formed in the
back cover 12 of the liquid crystal display panel, and a rectangular diaphragm is formed in the
cushion 23'. Cylindrical mounting pins 22 'formed at four corners of 22 are inserted. Thereby,
the speaker which makes this decorative board 15 a diaphragm is detachably attached to a liquid
crystal display panel.
[0016]
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Even if the exciter 21 is statically suspended, it is dynamically close to rest because of the large
inertial force resulting from the product of its weight and acceleration. That is, the exciter 21 is
dynamically in the same state as if the rear part was fixed to something, and flexural vibration is
excited on the diaphragm 22 using the decorative plate 15 based on the back and forth
movement of the bobbin.
[0017]
FIG. 5 is a plan view (A) showing a configuration of a deep bass speaker for a display device of
another embodiment of the present invention together with a display device to be mounted, and
a sectional view taken along the line A-A '. In FIG. 5, the components denoted by the same
reference numerals as those in FIGS. 1 to 4 are the same components as those described above
with reference to the respective drawings. In this embodiment, the exciter 21 of the panel type
speaker constituting the deep bass speaker 2 is installed between the cover of the pedestal 14 on
the back of the display device 1 and the decorative plate 16 attached to the pedestal 14, The
decorative plate 16 is used as the diaphragm 22. Similar to the structure of FIG. 3 described
above, the rear side of the exciter 21 is attached to the cover of the pedestal 14 via the annular
cushion 24.
[0018]
FIG. 6 is a rear view (A) showing a configuration of a deep bass speaker for a display device
according to still another embodiment of the present invention together with a display device to
be mounted, and a sectional view taken along the line A-A '. In this embodiment, the tip end
surface of the bobbin of the exciter 21 of the panel type speaker is adhesively fixed to the back
cover 12 used as the diaphragm 12, so that the exciter 21 is suspended and fixed to the back
cover 12 . The four corners of the back cover 12 are fixed to the four corners of the frame 17
fixed to the peripheral portion of the liquid crystal display panel 11 with the cushions 23 ′
interposed.
[0019]
FIG. 7 is a plan view (A) showing a configuration of a deep bass speaker for a display device
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according to still another embodiment of the present invention together with a display device to
be mounted, and a sectional view taken along the line A-A '. In this embodiment, the tip end
surface of the bobbin of the exciter 21 of the panel type speaker is adhesively fixed to the upper
cover of the pedestal 14 used as the diaphragm 22 so that the exciter 21 hangs in the upper
cover of the pedestal 14 It is fixed in the state. The mounting pins 22 'formed at the four corners
of the upper cover of the pedestal 14 are inserted into and screwed into the interior of a
cylindrical cushion 23' adhesively fixed to the four corners of the cover on the bottom surface of
the pedestal 14, The cover on the bottom is fixed while maintaining a gentle elasticity. Due to the
back and forth movement of the bobbin of the exciter 21, flexural vibration is excited on the
diaphragm 22 using the cover of the upper part of the pedestal 14.
[0020]
In the above, the structure which attached the panel type speaker to the back surface of the
liquid crystal panel of a display apparatus, and the decorative board and cover of a base, and
utilized these decorative boards and covers as a diaphragm was illustrated. However, a panel
type speaker may be attached to a decorative plate or a cover of a column of a display device,
and the decorative plate or the cover may be used as a diaphragm.
[0021]
Moreover, the structure attached to the display-type display apparatus of the heavy-duty speaker
for display apparatuses of this invention was illustrated. However, it may be configured to be
attached to the back surface or the like of the liquid crystal display portion of the notebook
computer for display device of the present invention or the like and the portable terminal device.
[0022]
FIG. 1 is a side view (shown by a partial sectional view) showing a deep bass speaker for a display
device according to an embodiment of the present invention together with a liquid crystal display
device to be mounted. FIG. 7 is a rear view showing the display low-frequency loudspeaker of the
above embodiment together with a liquid crystal display to be mounted. FIG. 2 is an enlarged
cross-sectional view of a portion where the heavy bass speaker 2 of FIG. 1 is attached. FIG. 7 is a
cross-sectional view showing the configuration of a deep bass speaker for a display device
according to another embodiment of the present invention. It is the top view (A) and its A-A
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'sectional drawing (B) which show the structure of the display apparatus for display apparatuses
of the other Example of this invention with the display apparatus of mounting object. It is a rear
view (A) and its A-A 'sectional drawing (B) which show the structure of the display apparatus for
mounting with a display apparatus for the display apparatus of further another Example of this
invention. It is the top view (A) and its A-A 'sectional drawing (B) which show the structure of the
display apparatus of mounting object with a display apparatus for display apparatuses of the
further another Example of this invention.
Explanation of sign
[0023]
1 Display device 11 liquid crystal display panel 12 back cover of liquid crystal display panel 13
post 14 base double bass speaker 21 exciter 22 diaphragm 22 'mounting pin 23, 23' cushion 24
cushion
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