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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
image projection screen.
2. Description of the Related Art In a conventional video projection type screen of this type, as
shown in FIG. 6, the screen 1 is a dedicated device for projecting an image, and the speaker 10 is
a dedicated device for producing a sound. As, each role was shared.
However, since the screen 1 and the speaker 10 are separated from each other and the positional
relationship between the image and the sound is not identical, in addition to requiring a large
space for installing both of them, Since the sound from the speakers is masked by the screen, the
sound quality is not good, and as a result, the projected image often lacks a sense of presence
that is rich in nature, and the setting is not easy.
The present invention has been made to solve the problems of the prior art as described above,
and provides a video projection type screen in which the positional relationship between video
and sound matches by providing the screen itself with a function of producing sound. The
purpose is to
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, a screen having a voice coil fixed on the back side and a magnetic circuit set on the
back side of the screen is used. Make the vibrating surface of the flat diaphragm of the speaker.
According to the above configuration, the screen itself emits a sound like the vibrating surface of
the speaker, and brings a natural rich presence to the image to be projected.
Embodiments of the present invention will now be described in detail with reference to the
The same reference numerals are used for the components common to the conventional one.
FIG. 1 is a rear view of an image projection type screen according to the present invention with a
conventional stereo sound source, FIG. 2 is a transverse sectional view of the main part thereof, 1
is a screen, 2 is a voice coil, 3 is a yoke, Is a magnet.
The voice coil 2 is fixed to the back surface of the screen 1 by an adhesive or the like, and a
magnetic circuit, that is, a yoke 3 having a plurality of magnets 4 arranged on the back surface
side of the screen 1 has a space to the screen Is set.
The yoke 3 is supported by support legs 11 installed on the floor.
The fixed position of the voice coil 2 is selected on the left and right sides of the screen 1 as
shown in FIG. 3, and the vertical transmission lines (right channel 20 and left channel 21) are
speakers at both left and right sides respectively. The terminal 5 is formed to have a lower side.
Further, in the case of the sound source for Dolby Pro Logic (DP), the fixed positions of the voice
coil 2 are respectively selected at three locations of left, center, and right as shown in FIG. A
directional zigzag transmission path (right channel 22, center channel 23, left channel 24) is
formed to have the speaker terminal 5 at the lower side.
Further, when the voice coil 2 is fixed by the sound source for the digital sound field processor
(DSP), as shown in FIG. 5, there are five fixed positions: upper left, upper right, center, lower left,
lower right. Each of the sections is selected to form a vertical transmission line (front right effect
channel 25 front effect left channel 26 center channel 27 right channel 28 left channel 29) at
each location, among which the front right effect The channel 25 and the front left effect channel
26 each have a speaker terminal 5 at the upper side, and the other right channel 28, the center
channel 27 and the left channel 29 each have the speaker terminal 5 at the lower side.
As shown in FIGS. 1 and 2, the plurality of magnets 4 disposed in the yoke 3 are permanent
magnets fixed on the front side of the yoke 3 at a fixed distance, and between the adjacent
magnets 4 The magnetic field is assembled so that each may be formed.
The spacing d between the adjacent magnets 4 is equal to the pitch spacing d of the longitudinal
portions 2a, 2b... Of the voice coil 2, as shown in FIG.
The support structure for the screen 1 of the yoke 3 is not shown in the figure, as shown in FIG.
1, around the periphery of each holding part, that is, the part to which the voice coil 2 is placed
and fixed in the large screen 1. A connecting portion 6 connecting the screen 1 and the yoke 3
via a material is provided, and in the inside of the part, as shown in FIG. Each is set to cross.
Reference numeral 7 is a hole communicating with the front and back of the yoke 3. In FIG. 1,
reference numeral 8 is an amplifier connected to the speaker terminals 5 of the left and right
channels 20 and 21, respectively.
9 is a leg which supports the entire magnetic circuit.
Next, the operation of the embodiment configured as described above will be described.
In FIG. 1, with the amplifiers 8 connected to the terminals 5 of the left and right channels 20 and
21, an image is projected onto the video projection type screen 1 from a projector (not shown).
At this time, a voice signal is input to the voice coil 2.
Since the voice signal is an alternating current, an alternating current flows in the voice coil 2
and the direction of the magnetic force changes.
At that time, according to the principle of Fleming's left hand, the screen 1 is vibrated by the
force in the vertical direction in FIG.
This vibration differs in amplitude according to the size of the sound, and generates a sound
giving a rich natural presence to the image projected on the screen 1
The arrangement of the voice coil and the magnet on the back surface side of the screen is not
limited to that of the embodiment described above, but various modifications are possible.
As described above, according to the present invention, the screen comprises the screen on
which the voice coil is fixed on the back and the magnetic circuit set on the back of the screen,
and the screen itself is a flat surface of the speaker. It is characterized by the fact that it makes
the vibrating surface of the diaphragm, so unlike the conventional one where the speaker is
behind the screen, the sound is reproduced as clear sound on the screen without being masked
by the screen and the sound from the screen itself Because it comes out, the positional
relationship between the image and the sound matches, and a very natural atmosphere with a
sense of presence comes out.
In addition, since the screen is integrated with the sound generation device, the installation space
can be small and the setting is easy.
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