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JPH0440797

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DESCRIPTION JPH0440797
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker system that is misplaced as
a rear projection video projection system. 2. Related Art In recent years, in audio visual
equipment, the screen size has been increased, the image quality has been improved, and the
sound quality has been improved. Above all, a rear projection type video projection system can
easily realize a large screen which can not be realized with a cathode ray tube. a + installation, no
need for mM. (3) Compared to the front projection type, a clear image can be obtained even if the
indoor side is bright. (4) A combination of reflecting mirrors enables compactification. It is
considered to be the mainstream in the future. By the way, the installation of the speaker in the
conventional rear projection type video projection system C (hereinafter referred to as rear type
vPS) is the same as that of the conventional CRT type television, and the feature of the rear type
vPS is not fully utilized. The Hereinafter, an example of a speaker system in a conventional rear
type vPS will be described with reference to the drawings. FIG. 4 is a view showing the internal
structure of a conventional rear type vPS. The image light emitted from the brown tube 1 passes
through the optical system 2 configured by a projection lens or the like, is reflected by the
reflection mirror 3, and is projected onto the transmissive screen 4 provided on the front of the
cabinet 5 of this rear type vPS. . The reflection mirror 3 is attached to the back of the cabinet 5,
and the speaker 6 is attached to the bottom of the front of the cabinet 5. A partition plate 7a
divides the cabinet 5 into upper and lower parts, so that a space including the speaker 6 has a
sealed structure. Problems to be Solved by the Invention However, in the configuration as
described above, the lowest resonance frequency (fo) for determining the low frequency
reproduction limit frequency of the 6 (1) speaker, which has the problems described below,
remains And it depends on the cabinet volume, and it is necessary to reproduce large bass with
sufficiently low distortion, a large diaphragm area and a large cabinet volume. However, in the
conventional example, the cabinet upper space is not effectively used as a speaker cabinet, and
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sufficient low frequency reproduction can not be performed. ζ 2) Since the cabinet volume of
the speaker is small, a small diaphragm must be used to reduce f, and not only the distortion
increases but also the force is poor. (3) The screen on which the image is projected is larger than
that of a general television, the distance between the speaker emitting the sound image and the
center of the screen is distant, and the image emitted from the screen itself does not coincide
with the filtered sound image Had the challenge of
The present invention solves the above-mentioned conventional problems, effectively utilizing
the space inside the cabinet and enabling sufficient low-frequency reproduction, and an image
projected on a screen surface and a sound image radiated from a speaker To match as much as
possible, and to provide a powerful video projection system. A rear projection type video
projection system according to claim 1 comprises a transmission type screen for image
projection and a speaker for sound image emission in the same cabinet, and vibration on the
back side of the transmission type screen. 4. The rear projection type video projection system
according to claim 2, characterized in that the transmission driver according to claim 2 is
characterized in that the transmission type screen according to claim 1 is curved. In video
projection, a transmission-type screen for image projection and a speaker for sound image
emission are housed in the same cabinet, and the inside of the cabinet is formed by a partition
plate in a large space on the transmission-type screen side and an opening formed in the front of
the cabinet Divided into small spaces on the side, and in the partition plate the speaker The rear
projection type video projection system according to claim 4, characterized in that the front side
of the speaker is attached to the side of the small space, the transmission projection screen for
image projection and the speaker for sound image emission are the same. The interior of the
cabinet is divided into a space on the transmission screen side and another space by a partition
plate together with a storage space in the cabinet, the transmission screen is formed of a flexible
material that transmits sound, and the partition plate The present invention is characterized in
that the speaker is mounted in such a manner that the rear surface of the speaker is on the side
of the other space, and the front surface of the speaker is on the side of the transmissive screen.
According to the construction of the first aspect of the invention, the vibration driver is attached
to the back surface of the transmission type screen for projecting an image, and the sound image
is emitted directly from the transmission type screen by the flat speaker structure. Therefore, the
large area of the diaphragm and the internal space of the cabinet can be effectively used as an
acoustic cabinet of the speaker. According to the configuration of the second aspect, since the
shape of the transmission type screen driven by the vibration driver is curved, the rigidity
becomes higher than that of the flat screen, and the frequency which can be reproduced as a
speaker by weight reduction of the component material The bandwidth can be broadened.
According to the configuration of claim 3, the cabinet is divided by the partition plate, and the
large space of the cabinet can be utilized as a speaker sealed box by attaching the speaker to the
partition plate.
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このためf。 The value of decreases. Further, compared to the case where the diaphragm and
the screen are shared, it is not necessary to make the screen larger than the image projection
range, the whole can be miniaturized, and the assembly becomes easy. According to the
configuration of M claim 4, the transmission type screen is formed of a flexible material having
sound transmission, and the sound image of the speaker is emitted outside the cabinet through
the transmission type screen for image projection. First Embodiment A first embodiment of the
present invention will be described with reference to the drawings. FIG. 1 is a view showing an
internal structure of the screen integrated speaker system. Those having the same function as in
FIG. 4 showing the prior art will be described with the same reference numerals. Similar to FIG. 4
of the conventional example, the image light emitted from the cathode ray tube 1 passes through
the optical system 2 composed of a projection lens and the like and is reflected by the reflection
mirror 3 and is transmitted onto the screen 4a of the transmission type provided on the front of
the cabinet 5. Projected Here, the screen 4 m not only projects the image from the cathode ray
tube 1 but also emits a sound as a diaphragm that emits a sound image. Specifically, the screen
4a is driven by a vibration driver 8 mounted on the rear surface of the flat diaphragm. The
vibration driver 8 is provided on the outer periphery of the screen 4 & so as not to block the
projected image. As described above, according to this embodiment, it is possible to reproduce
powerful bass from the diaphragm of a large area. Further, since the middle and high-pitched
sound reproducing speaker (not shown) does not require a large cabinet volume, it is provided at
the lower part of the screen as in the prior art. In the case where the flat screen remains rigid
and the reproduction zone is narrow, it is possible to widen the zone by using the curved screen
as a diaphragm. Next, a second embodiment of the present invention will be described with
reference to FIG. A partition plate 7b is provided in the upper part in the cabinet 5 in a range not
to interfere with the image light reflected by the mirror 3, the speaker 9a is attached to the
partition plate 7h I, and a sound image to be emitted is provided in the front of the cabinet 5 It
radiates from the opening 10. In this embodiment, a large space inside the cabinet can be
effectively used as a speaker cabinet, so that it is possible to lower the value by a factor of ヲ and
reproduce powerful bass. Further, compared to the case where the diaphragm and the screen are
shared, it is not necessary to make the screen larger than the image projection range, the whole
can be miniaturized, and the assembly can be facilitated. Next, a third embodiment of the present
invention will be described with reference to FIG. A screen 4c made of a flexible sheet is provided
on the front of the cabinet 5 to transmit low frequencies of about 500 Hx or less without loss.
The sound radiated from the speaker 9b into the cabinet passes through the screen 4e and is
emitted to the front. In this embodiment, the speaker can be mounted in a dead space in the
cabinet, so that the whole can be miniaturized, and the sound is emitted from the screen surface,
so that an AV system in which the image and the sound image coincide with each other is
obtained. However, although the screen 4c shown in FIG. 3 transmits low tones of 500 Hz or less,
a small closed box is provided at the lower part of the cabinet 5 as in the embodiment of FIG. It is
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sufficient to provide medium-to-high range specific spy sentences in the state of having, and to
emit a sound image of the middle to high range to the front of the cabinet 5. In the first
embodiment of the present invention, the screen 4a having a similar function to the diaphragm
of a flat speaker is formed into a flat plate shape or a curved shape, or the curvature is for
enhancing the rigidity of the nuclean 4a as a diaphragm. Note that the bending direction may be
the front direction or the back direction of the video system. Also, this video projection system
converges the image emitted from the cathode ray tube from the optical system 2 through the
reflection mirror 3 and screens 4m and 4b. Although the image is formed at 4 @, the present
invention can also be realized in a liquid crystal video projection system using a liquid crystal
panel instead of a Braun tube. As described above, according to the first aspect of the present
invention, since the vibration driver is attached to the back of the transmission screen, the screen
itself acting as a screen for image projection also acts as a diaphragm of a speaker for sound
image emission. Do. Therefore, the area of the diaphragm becomes extremely large as compared
with the diaphragm of a general speaker, so that the reproduction band of the bass can be
expanded, and powerful bass can be reproduced. In addition, since the sound is emitted from the
screen itself, there is an effect that the image and the sound image match. According to the
second aspect of the present invention, since the transmission type screen is curved, the rigidity
is higher than that of the flat screen, and when the diaphragm is excited by the driver, it is
formed inside the diaphragm as the screen. The division vibration is reduced, and the sound
conversion efficiency is improved. Furthermore, since the mass of the diaphragm can be reduced,
the reproduction band of the sound is expanded. As a result, specular reflection (specular
reflection) of unnecessary light incident from the outside of the cabinet is reduced, and there is
an effect that position restriction is not given to a viewer of the video projection system. Next,
according to the configuration of claim 3, one of the cabinet spaces including the partition plate
seen from the speaker is expanded, and most of the space of the video projector including the
cathode ray tube, the optical system, the reflection mirror and the screen, It can be used as an
acoustic enclosure.
このためf。 It becomes possible to play the deep bass without having to reduce the size of the
cabinet itself. Furthermore, since the screen is made of a rigid material, the vibration of the
screen itself at the time of bass reproduction is eliminated, and a sharp image can be viewed.
Further, according to the construction of claim 4, since the sound is transmitted through the
transmission type screen, the positional difference between the sound image from the speaker
and the image is eliminated and the video projection system can be made powerful.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a longitudinal sectional view of a cabinet of a video projection system according to a
third embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a cabinet of a
video projection system according to a second embodiment, and FIG. FIG. 4 is a longitudinal
sectional view of a cabinet of the video projection system of the embodiment, and FIG. 4 is a
longitudinal sectional view of the cabinet of the conventional video projection system.
1--Braun tube, 2-Optical system, 3-Reflective mirror 4m, 4b, 4g =-Screen, 5-Cabinet, 6--Speaker,
7.71.7b-Partition plate , 8: Vibration driver, 9 m, 9 b---Speaker. Second cause
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