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JP2004200761

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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
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DESCRIPTION JP2004200761
An image viewing apparatus capable of obtaining a high degree of immersion also in sound is
realized. SOLUTION: A curved screen S is vibrated by vibration transducers T1 to T4 for
converting an acoustic signal into vibration, whereby a sound wave is emitted from the screen
using the screen as an acoustic diaphragm. [Selected figure] Figure 1
Video viewing device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
projection-type image viewing apparatus having a curved screen, and more particularly to an
image viewing apparatus having features in an audio device. 2. Description of the Related Art In
contrast to a conventional movie apparatus for projecting an image on a flat screen, a spherical
screen having a projection surface obtained by cutting a part of a sphere or a curved screen as
having a curved screen. An image viewing apparatus for projecting an image on an arched screen
having a projection surface is known. A typical example of an image viewing apparatus having a
spherical screen is a planetarium, and as a known example of an image viewing apparatus that
projects an image on an arched screen, for example, a curved surface with an arched cross
section that surrounds the viewer with the screen being horizontally long. The invention
described in Japanese Patent Application Laid-Open No. 6-165875 in the form of a shape can be
mentioned. On the other hand, with regard to a video viewing apparatus having a spherical
screen, for example, the applicant of the present invention has first applied for projecting an
image in place of the conventional photo explanation in a commercial facility such as an event
hall, a museum or a showroom. A small image viewing apparatus as shown in FIG. 10 is invented
as Japanese Patent Application No. 2001-318008. [0004] The above-mentioned video viewing
device is intended to have the effect of being able to obtain high immersive feeling in the
spectator even in an exposed state without being in a dark room state where the space is divided,
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and part of the sphere of the screen S was cut off The spherical screen has a projection surface,
and the spherical screen is disposed so that the upper and lower centers are in contact with a
large circle parallel to the floor surface F, and the projector P is disposed at a position eccentric
to the spherical center of the spherical surface. It is characterized by FIG. 9 is a view showing
how to cut and arrange the above-mentioned spherical screen, where the spherical screen S is a
pair of parallel small circles SC1 and SC2 located above and below the great circle GC1 parallel to
the floor surface F. While being enclosed, it is set as the shape which cut off the sphere in the
area | region enclosed by a pair of great circles GC2 and GC3 perpendicular | vertical to a floor
surface. Conventionally, as an audio device in an image viewing apparatus for projecting an
image on a screen, as shown in FIG. 11, a plurality of speakers SP are disposed on the upper and
lower or side away from the screen S It was common to let the audience hear the sound. In
addition, the screen is made of a material that allows sound waves to pass through, such as
punching metal or vinyl having pores, and the speaker is disposed on the back side so that the
sound of the speaker installed on the back side of the screen comes out of the image. Attempts
have also been made to produce pseudo effects.
SUMMARY OF THE INVENTION In the above-mentioned prior art in an image viewing apparatus
having a curved screen, the screen is arranged so as to surround the spectator, so the spectator is
highly immersive with respect to the image. I was able to get it. However, as for the sound device,
when the one shown in FIG. 11 described above is adopted, the sound field of the sound obtained
from the sound source does not match the image on the screen, or the immersive feeling is
impaired. There was a problem that the sound from the sound source interfered with the sound
reflected on the screen, and a clear sound quality could not be obtained. Also, in the
configuration in which the speaker is disposed on the back side of the screen, the screen must be
provided with pores for passing sound waves, which reduces the visual effect and limits selection
of the screen. there were. Furthermore, as a common problem with these, since the sound source
using a conventional speaker is a point sound source, the acoustic energy decreases in
proportion to the square of the distance, and sufficient sound pressure is obtained at a position
away from the screen In order to achieve this, there was a problem that a high-power sound
system was required. In particular, in the image viewing apparatus shown in FIG. 8 and FIG. 9
described above, since the space where the image is projected is not in the dark room state which
is divided up but in the exposed state, the sound source and the audience can In order to prevent
the sound pressure from being attenuated even if the distance changes, the output must be
increased, causing a problem that the sound is too loud for the audience close to the sound
source. Further, in the case of a spherical screen, it is desirable to place a point sound source
toward the core to obtain integrity with the image, but in such a case, it is unexpected when
viewing in a place other than the core. The acoustic characteristics of the above-mentioned are
problematic, and the viewing position is limited. SUMMARY OF THE INVENTION An image
viewing apparatus according to the present invention is created in view of the problems of the
prior art described above, and is curved by a vibration converter that converts an acoustic signal
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into vibration. By vibrating the screen, the screen is used as an acoustic diaphragm to emit sound
waves from the screen. BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments
of the present invention will be described below with reference to the attached drawings. FIG. 1
is a perspective view showing an entire embodiment of a viewing apparatus according to the
present invention. Here, as an image viewing apparatus having a curved screen, the image
viewing apparatus shown in FIG. 10 is taken as an example. In the figure, reference numeral 1
denotes a casing which constitutes the main body of the apparatus, which constitutes a spherical
screen S having a projection surface in which a part of the sphere is cut off on the inner side,
Configured as
6 and 7 show an example of the specification of the screen S. As shown in FIG. Here, the
spherical screen is surrounded by a pair of parallel small circles SC2 and SC1 located in the
range of 40 degrees above and 50 degrees below the great circle GC1 parallel to the floor surface
(see FIG. 7) and perpendicular to the floor surface The sphere G is cut out in a region surrounded
by a pair of great circles GC2 and GC3 located in the range of 120 degrees to the left and right,
and specific dimensions are assumed to be 346 cm wide and 282 cm high. The above 120 °
wide and 90 ° high area exactly matches the view of human eyes, which makes it possible to
obtain maximum immersion feeling at a minimum angle. In addition, in order to obtain the best
effect of the present invention, it is desirable to configure the screen within a range of ± 20
degrees vertically and ± 20 degrees horizontally with respect to the above angle. In this
embodiment, the housing 1 is divided into three in the width direction by the division pieces 1A,
1B, and 1C in consideration of formability and portability. Each divided piece has the same shape,
and this is illustrated in FIG. 5 by taking the divided piece 1C as an example. The divided pieces
here are formed in a hollow shape in which the top wall 5, the bottom wall 6, and the side walls 4
and 4 protrude from the back surface of the screen S and the back surface is covered by the back
wall 7. Combine by appropriate coupling means. Although the coupling means is exemplified
here to be coupled by a bolt and a nut, it goes without saying that it may be by other means.
Further, here, reinforcing ribs 3 in the vertical and horizontal directions are provided on the back
surface of the screen S for reinforcement. In addition, it is desirable that the material of the
divided piece is hard to a certain extent in consideration of using it as an acoustic diaphragm,
and in consideration of its formability, FRP or hard plastic, or molded wood or compressed pulp
is preferable. Etc. are suitable. The interior of the housing 1 is coated with a screen paint to
function as a screen S for obtaining a clear projection image. On the other hand, the outer side
may be used as a display surface of characters and patterns for use as a medium for advertising.
A bracket 2 is detachably mounted on the upper portion of the housing 1 having the above
configuration toward the rear (the front with respect to the screen) and has a fish-eye projection
lens at the bracket end. Projectors P, and other devices such as audio devices required for
projection are supported. Reference symbols T1 to T4 in the figure denote vibration transducers
which convert an acoustic signal into vibration. This converter itself is a conventionally known
one configured to transmit vibration obtained by energizing an acoustic signal (signal current) to
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a voice coil disposed in a magnetic gap to a substance such as a plate attached with the
converter. There are some known examples (for example, U.S. Pat. No. 3,366,749, Japanese
Examined Patent Publication No. 52-21050, Japanese Examined Patent Publication 7-28791,
etc.).
In this embodiment, the vibration transducer is attached to the back of the screen as well as to
the reinforcing ribs of the screen. Specifically, the vibration transducer T2 for the left channel is
attached to the back of the screen of the left divided piece 1A, and the vibration transducer T1 is
similarly attached to the reinforcing rib of the left divided piece 1A, and the vibration for the
right channel The transducer T4 is attached to the back of the screen of the right divided piece
1C, and the vibration transducer T3 is similarly attached to the reinforcing rib of the right
divided piece 1C (see FIGS. 2 and 3). FIG. 8 is a block diagram showing an electric circuit of the
video image appreciation apparatus according to the present invention. In the figure, reference
numeral 10 denotes a video / audio output device such as a DVD player, a hard disk recorder, a
video tape recorder, a personal computer, etc. The video signal is output to the video projector P,
and the audio signal is distributed to the left and right channels After being adjusted, the signal is
amplified by the main amplifier 12 and output to the vibration converters T1 to T4. The present
invention can also be applied to a hemispheric dome surface for a planetarium, in which case one
or more vibration transducers are provided on the back side of the dome made of, for example,
FRP. The present invention having the above-described structure has the following unique
effects.
(1)
Since the curved screen itself emits a sound wave as an acoustic diaphragm, it becomes a plane
sound source and it becomes difficult for the audience to specify the sound source. In this case,
the screen is positioned so as to envelop the spectator, so that the spectator can have an
immersive feeling of being entrapped in the sound. On the other hand, as a characteristic of a
curved screen, it provides the audience with a visual field that is enveloped in the image, so that
the visual attention and the auditory attention will be in the same direction. It is possible to give
spectators a high sense of immersion that surpasses their use.
(2)
For the same reason, when the screen itself becomes a plane sound source, it becomes difficult to
generate a narrow area having the acoustic characteristic specifically exhibited when viewing at a
place other than the core as in the case of using a point sound source. There is no restriction on
the position, and space can be used effectively. This is a device that allows a spectator to walk
around in the device, especially when the device allows the spectator to freely move in and out of
the device without having a specific seat, as in the image viewing device of the embodiment. It is
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useful because it is not.
(3)
For the same reason, sound pressure attenuation due to distance is small because of plane sound
source, rich acoustic effects are obtained even at a distance from the screen, and spectators close
to the sound source (screen surface) and distant spectators simultaneously have less stress It
becomes possible to appreciate it.
(4)
As it does not require a speaker system other than the screen, it has a clean appearance and a
sophisticated design. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an
embodiment of an image viewing apparatus according to the present invention. [Figure 2] Same
as above, front view. FIG. 3 is a partially cutaway plan view of the same. FIG. 4 is a partially
cutaway side view showing the same as in use. FIG. 5 is a perspective view of the same divided
piece. FIG. 6 is a conceptual view showing the configuration of the screen. FIG. 7 is a conceptual
view showing the configuration of the screen. FIG. 8 is a block diagram of the electric circuit. FIG.
9 is a conceptual view showing the configuration of the screen. FIG. 10 is a conceptual view
showing the configuration of the screen of the same. FIG. 11 is a front view of the prior art.
[Description of the code] 1 Frame S screen T1 to T4 Vibration converter P Projector
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