JP2007184795A - Screen speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a viewer to listen to audio output from a screen as a well-balanced audio. <P>SOLUTION: A screen speaker system 10 has a screen 12 on which a projector projects video and driving elements 50 for driving the screen 12, and outputs a sound from the screen 12, wherein at least two driving elements 50 are arranged in a vertical direction of the screen 12 and have variable resistors 88 for varying outputs of sound signals input to the driving elements 50 arranged in the vertical direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen speaker system that emits sound from a screen that displays an image projected from the outside.

  Conventionally, a direct drive type that emits sound from the front of the screen by adding a signal for the center speaker to the voice coil arranged in the center of the screen and adding a signal for the left and right channels to the voice coil arranged on the left and right There is a screen speaker system. As such a type of screen speaker system, for example, the one disclosed in Patent Document 1 is known.

Japanese Patent Laying-Open No. 2005-64932 (FIGS. 21 to 23)

  In recent years, in order to provide more powerful video and sound, home theater systems have been required to increase the size of the screen for projecting the video, and the above-described direct drive screen speaker system has further increased screen size. Is required.

  However, in the case of the screen speaker system described in Patent Document 1, the enlargement of the screen is restricted by the outer dimensions of the aluminum thin plate that is the material of the screen. For example, the maximum dimension of the outer shape of an aluminum plate currently on the market is 2500 mm (length) × 1250 mm (width). Therefore, the structure of the screen speaker system described in Patent Document 1 cannot be expected to exceed the above-mentioned outer dimensions.

  In order to solve such a problem, the present inventor prepared a plurality of screen speakers described in Patent Document 1 and joined them to manufacture a screen speaker system having a larger screen.

  However, when sound is emitted from the entire screen of a screen speaker having such a large screen, it is required that the sound pressure balance between the top and bottom of the screen be improved with respect to the viewer facing the screen. .

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide a screen speaker system that enables a viewer to hear the sound emitted from the screen as a more balanced sound. Is.

  In order to solve the above-mentioned problems, the present invention includes a screen for projecting an image by a projector and a driving body that drives the screen, and in the screen speaker system that emits sound from the screen, the driving body includes: At least two or more are arranged in the vertical direction of the screen, and an output volume for changing the output of the acoustic signal input to the drive body arranged in the vertical direction is provided.

  In addition to the above-mentioned invention, in another invention, the screen speaker system further comprises a screen speaker constituted by a screen and a part of the drive unit as one unit, and a plurality of the screen speakers are joined. It is configured.

  According to another invention, in addition to the above-described invention, the screen is further provided with a divided area that is divided into a plurality of areas, and a channel is assigned to each divided area and an acoustic signal is provided for each channel. A preamplifier for amplifying the signal and a power amplifier for amplifying the acoustic signal for each channel output from the preamplifier are provided, and the output of the acoustic signal after output from the preamplifier is changed.

  Further, according to another invention, in addition to the above-mentioned invention, the screen is further provided with a divided area which is divided into a plurality of areas, and a channel is assigned to each divided area and an acoustic signal is provided for each channel. A preamplifier for amplifying the signal and a power amplifier for amplifying the acoustic signal for each channel output from the preamplifier are provided, and the output volume changes the output of the acoustic signal before being input to the power amplifier.

  According to the present invention, the viewer can hear the sound emitted from the screen as a more balanced sound.

  Hereinafter, a screen speaker system 10 according to an embodiment of the present invention will be described with reference to the drawings. The screen speaker system 10 is configured by joining four screen speakers 11 as one unit. First, the configuration of the screen speaker 11 will be described.

  FIG. 1 is a perspective view showing the screen speaker 11, and FIG. 2 is a perspective view showing a state where the screen 12 is removed from the screen speaker 11. In the following description, in FIGS. 1 and 2, one end side indicates the arrow X1 direction, and the other end side indicates the arrow X2 direction. In the present embodiment, a drive body having a magnetic circuit 30 and a voice coil (not shown) is employed as an example of a drive body for driving the screen 12, and a magnetic circuit is used as the housing. A magnetic circuit housing 40 for holding 30 is employed.

  The screen speaker 11 is a direct drive type screen speaker. As shown in FIGS. 1 and 2, a screen 12 that projects an image from the outside, a housing 14 that holds the screen 12, and a drive that vibrates the screen 12. The body is mainly composed of.

  As shown in FIG. 2, the housing 14 includes three back plates 15 divided into three regions and a frame body 16 that surrounds the three back plates 15. The back plate 15 is a plate-shaped member having a rectangular shape, which is a 4 mm thick plywood in which lauan is used as a core material and a china is superimposed on the surface thereof. The board is glued. The frame body 16 includes a side frame 17 that is a rectangular frame member, and two middle rails 18 that are arranged inside the side frame 17 along the short direction of the rectangle. . The side frame 17 and the middle rail 18 are made of plywood obtained by cutting out ash material to an arbitrary thickness and stacking three pieces. The back plate 15 is attached by screwing to a plurality of locations of the frame body 16.

  As described above, the two intermediate bars 18 are arranged inside the side frame 17 in the short direction, and the area inside the side frame 17 is divided into three at equal intervals along the longitudinal direction. Further, both end faces in the longitudinal direction of the intermediate rail 18 are joined to the inner side surface of the longitudinal side frame 17 by an adhesive, and serve to improve the strength of the frame body 16 (see FIG. 2). . The screen 12 is attached so as to close the casing 14 from above the casing 14.

  Further, as shown in FIG. 2, the magnetic circuit 30 is disposed in each of the divided portions 14 a divided into three equal volumes by the two middle rails 18 in the housing 14, and the magnetic circuit 30 is held. A magnetic circuit housing 40 is arranged. The magnetic circuit 30 is arranged inside the magnetic circuit housing 40 through a hole (not shown) provided in the center of the back plate 15 from the back side of the magnetic circuit housing 40. Further, three voice coils (not shown) are arranged on the back surface of the screen 12 so as to correspond to the position of the magnetic circuit housing 40. The voice coil (not shown) constitutes a part of a driving body that drives the screen 12, and is formed by winding a coil wire around a coil bobbin having a predetermined size.

  Further, in FIG. 2, in the vicinity of the upper end face of each back plate 15, the back plate 15 passes through the centers of the one end side and the other end side direction and is symmetrical with respect to the center line in the short direction. Two terminal holes 15q are provided. The terminal hole 15q is a hole for placing an input terminal substrate (not shown) for applying a voltage to a voice coil (not shown).

  Also, an input terminal board is mounted (not shown) in each of the two terminal holes 15q formed in the back plate 15, and input to a voice coil (not shown) attached to the back surface 12a of the screen 12. An input signal lead wire (not shown) is attached to the surface of the back plate 15. One end of each lead wire (not shown) is connected to a voice coil (not shown), and the other end of each lead wire (not shown) is connected to an input terminal substrate (not shown).

  Next, the configuration of the screen speaker system 10 will be described. FIG. 3 is a diagram showing the basic unit 70 of the screen speaker system.

  As shown in FIG. 3, the screen speaker system 10 is configured by joining four directly-driven screen speakers 11 that form one unit. The external dimensions of the screen speaker 11 are a width of 168.09 mm, a height of 896.5 mm, and a depth of 35 mm, which is a 75-inch direct drive screen speaker. In addition, the external dimension of the screen speaker 11 is not restricted to this, It is good also as another external dimension.

  In FIG. 3, the screen speaker 11 arranged at the lower left is the screen speaker 11a, the screen speaker 11 arranged at the upper left is the screen speaker 11b, the screen speaker 11 arranged at the lower right is the screen speaker 11c, and the upper right. The screen speaker 11 disposed in the screen is referred to as a screen speaker 11d. Each side frame 17 of the screen speakers 11a to 11d is provided with a through hole (not shown). Therefore, as shown in FIG. 3, the screen speakers 11a to 11d are arranged on the top, bottom, left, and right, a bolt is inserted through a through hole (not shown) in the adjacent side frame 17, and the bolt is fastened with a nut. The screen speakers 11a to 11d arranged vertically and horizontally can be fixed. By joining the screen speakers 11a to 11d as described above, the basic unit 70 of the screen speaker system 10 having an outer dimension of 150 inches is completed.

  The screen unit 73 of the basic unit 70 includes a joint 71a between the screen speaker 11a and the screen speaker 11b, a joint 71b between the screen speaker 11c and the screen speaker 11d, a joint 71c between the screen speaker 11a and the screen speaker 11c, and the screen speaker 11b. A joint 71d of the screen speaker 11d is formed. If no means is applied, the four joint portions 71a, 71b, 71c, 71d appear on the surface of the screen portion 73 in a cross shape from the center portion of the screen portion 73. In addition, a gap, a step, or the like is generated in each of the joint portions 71a, 71b, 71c, and 71d in the state. Therefore, if no means is applied, when the image from the projector is projected onto the screen unit 73 of the basic unit 70, the screen unit 73 has the joints 71a, 71b, 71c, 71d (hereinafter referred to as the joints 71a, 71d). When collectively referring to 71b, 71c, 71d, they are simply referred to as a joint 71.) A cross-shaped black line clearly appears.

  Accordingly, the joint portion 71 is flush with the surface of the screen portion 73 by filling the gap portion or the step portion generated in the joint portion 71 with the putty and polishing the portion filled with the putty with the abrasive. Thereafter, when the paint is uniformly applied to the entire surface of the screen portion 73, the gaps or steps in the joint portion 71 disappear completely from the screen portion 73. Therefore, after painting, the screen speaker system 10 having the screen portion 73 that looks like a single large screen is completed.

  Next, wiring connection in the screen speaker system 10 will be described.

  FIG. 4 is a diagram illustrating a wiring configuration in the screen speaker system 10. L, R, and C shown in FIG. 4 mean the left channel, the right channel, and the center channel, respectively.

  FIG. 4 shows a wiring configuration when the screen speaker system 10 is viewed from the back side of the basic unit 70. In the screen speaker system 10, the twelve divided portions 14a formed in the basic unit 70 are divided into left and right channel regions 75 and 77, which are divided regions corresponding to the respective channels that are largely divided into the left, right, and center. A central channel region 79 is formed. Each of the four drivers 50 arranged in the left channel region 75, the right channel region 77, and the central channel region 79 includes a sound signal and a sound pressure signal (hereinafter referred to as a sound signal and a sound pressure signal) for the left channel, the right channel, and the center channel. , When referring to the audio signal and the sound pressure signal collectively, they are simply referred to as acoustic signals). Furthermore, each of the left channel region 75, the right channel region 77, and the central channel region 79 includes an upper left channel region 75a, an upper right channel region 77a, and a middle upper channel region 79a that are upper regions in the regions 75, 77, and 79, respectively. Each of the regions 75, 77, 79 is divided into a lower left channel region 75b, a lower right channel region 77b, and a middle lower channel region 79b, which are lower regions.

  As shown in FIG. 4, the preamplifier 80 includes a left channel preamplifier 80a that outputs an acoustic signal to the left channel, a right channel preamplifier 80b that outputs an acoustic signal to the right channel, and a center that outputs an acoustic signal to the center channel. A channel preamplifier 80c. Preamplifier 80 functions such as tone control to adjust sound quality, volume control to control volume control, balance control to adjust left and right volume balance, selector to select input source and select desired acoustic signal It has. An acoustic signal that has already undergone signal processing is input to each of the left channel preamplifier 80a, the right channel preamplifier 80b, and the center channel preamplifier 80c.

  In the screen speaker system 10, six power amplifiers 85a, 85b, 86a, 86b, 87a, 87b are arranged. Each of the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b is provided with an output volume 88 for changing the output. Therefore, the signals input to the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b can be amplified by the output volume 88 with different amplification factors.

  The output side of the left channel preamplifier 80a and the input side of the power amplifiers 85a and 85b, the output side of the right channel preamplifier 80b, the input side of the power amplifiers 86a and 86b, and the output side of the central channel preamplifier 80c and the power amplifiers 87a and 87b. Are connected by wires 90, 91 and 92, respectively. Specifically, the wiring 90 connected to the output side of the left channel preamplifier 80a is branched into two wirings at a branch point A, and one of the branched wirings is connected to the input side of the power amplifier 85a. Yes. The other branched line is connected to the input side of the power amplifier 85b. Similarly, the wiring 91 connected to the output side of the right channel preamplifier 80b is branched into two wirings at a branch point B, and one of the branched wirings is branched to the input side of the power amplifier 86a. This wiring is connected to the input side of the power amplifier 86b. Further, the wiring 92 connected to the output side of the central channel preamplifier 80c is branched into two wirings at a branch point C, and one of the branched wirings is connected to the other side branched to the input side of the power amplifier 87a. The wiring is connected to the input side of the power amplifier 87b.

  The two driving bodies 50 arranged in the output side of the power amplifier 85 a and the upper left channel region 75 a are connected by a wiring 93. Further, the two driving bodies 50 arranged in the output side of the power amplifier 85 b and the lower left channel region 75 b are connected by a wiring 94. Similarly, the two drive bodies 50 arranged in the output side of the power amplifier 86a and the upper right channel region 77a are connected by the wiring 95, and are arranged in the output side of the power amplifier 86b and the lower right channel region 77b. The two driving bodies 50 are connected by a wiring 96. Similarly, the two driving bodies 50 arranged in the output side of the power amplifier 87a and the middle upper channel region 79a are connected by the wiring 97, and are connected to the output side of the power amplifier 87b and the middle lower channel region 79b. The two arranged driving bodies 50 are connected by a wiring 98.

  Specifically, the wiring 93 connected to the output side of the power amplifier 85a is branched into two wirings at the branch point D, and is connected to the two driving bodies 50 arranged in the upper left channel region 75a. The wiring 94 connected to the output side of the power amplifier 85b is branched into two wirings at a branch point E, and is connected to two driving bodies 50 arranged in the lower left channel region 75b. Similarly, in the case of the right channel and the center channel, the wirings 95, 96, 97, 98 connected to the output sides of the preamplifiers 86a, 86b, 87a, 87b are respectively at branch points F, G, H, I. The wiring branched into two wirings and branched at the respective branch points F, G, H, and I are respectively connected to the upper right channel region 77a, the lower right channel region 77b, the middle upper channel region 79a, and the middle lower channel region 79b. The two driving bodies 50 are connected.

  FIG. 5 is a diagram illustrating a situation after the volume adjustment is performed in the screen speaker system 10. L, R, and C shown in FIG. 5 mean the left channel, the right channel, and the center channel, respectively.

  The amplification factors of the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b are set to values suitable for the respective reference values by the output volume 88. Therefore, each driver 50 is driven by the signals output from the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b so as to provide balanced audio to the viewer.

  Next, the background of signal transmission input to the preamplifier 80 will be described.

  When an acoustic signal subjected to signal processing in advance is input to each of the left channel preamplifier 80a, the right channel preamplifier 80b, and the center channel preamplifier 80c, the acoustic signal controlled or selected by each of the preamplifiers 80a, 80b, and 80c. Are output from the preamplifiers 80a, 80b, and 80c.

  The acoustic signal output from the left channel preamplifier 80a is branched at a branch point A of the wiring 90 and input to each of the power amplifier 85a and the power amplifier 85b. The sound pressure signals input to the power amplifier 85a and the power amplifier 85b are amplified to appropriate sound pressure levels by output volumes 88 provided in the power amplifiers 85a and 85b, respectively. Thereafter, the acoustic signal output from the power amplifier 85a is branched at the branch point D of the wiring 93 and input to each of the two driving bodies 50 disposed in the upper left channel region 75a. Then, the two driving bodies 50 are driven based on those acoustic signals. On the other hand, the acoustic signal output from the power amplifier 85b is branched at the branch point E of the wiring 94 and input to each of the two driving bodies 50 disposed in the lower left channel region 75b. Then, the two driving bodies 50 are driven based on those acoustic signals.

  The acoustic signal output from the right channel preamplifier 80b is branched at the branch point B of the wiring 91 and input to each of the power amplifier 86a and the power amplifier 86b. The sound pressure signal input to each of the power amplifier 86a and the power amplifier 86b is amplified to an appropriate sound pressure level by the output volume 88 provided in each of the power amplifiers 86a and 86b. Thereafter, the signal output from the power amplifier 86a is branched at the branch point F of the wiring 95 and input to each of the two driving bodies 50 disposed in the upper right channel region 77a. Then, the two driving bodies 50 are driven based on those acoustic signals. On the other hand, the acoustic signal output from the power amplifier 86b is branched at the branch point G of the wiring 96 and input to each of the two driving bodies 50 disposed in the lower right channel region 77b. Then, the two driving bodies 50 are driven based on those acoustic signals.

  Furthermore, the acoustic signal output from the central channel preamplifier 80c is branched at a branch point C of the wiring 92 and input to each of the power amplifier 87a and the power amplifier 87b. The sound pressure signals input to the power amplifier 87a and the power amplifier 87b are amplified to appropriate sound pressure levels by output volumes 88 provided in the power amplifiers 87a and 87b, respectively. Thereafter, the acoustic signal output from the power amplifier 87a is branched at the branch point H of the wiring 97 and input to each of the two driving bodies 50 disposed in the middle and upper channel region 79a. Then, the two driving bodies 50 are driven based on those acoustic signals. On the other hand, the acoustic signal output from the power amplifier 87b is branched at a branch point I of the wiring 98 and input to each of the two driving bodies 50 arranged in the middle / lower channel region 79b. Then, the two driving bodies 50 are driven based on those acoustic signals.

  In the screen speaker system 10 configured as described above, the upper left channel region 75a, the lower left channel region 75b, the upper right channel region 77a, the lower right channel region 77b, the middle upper channel region 79a, and the middle lower channel region 77b are arranged. It is possible to drive the two driving bodies 50 as different units at different sound pressure levels. Therefore, different sound pressure distributions can be obtained in both the vertical direction and the horizontal direction of the basic unit 70. Therefore, for example, when the sound pressure level of the lower channel regions 75b, 77b, and 79b in the screen unit 73 is large, the output of the power amplifiers 85a, 86a, and 87a corresponding to the upper channel regions 75a, 77a, and 79a. By making the volume 88 larger than the reference value and making the output smaller than the reference value by the output volume 88 of the power amplifiers 85b, 86b, 87b corresponding to the channel regions 75b, 77b, 79b on the lower side, the screen unit 73 The sound pressure level from can be lowered. Therefore, the balance of the sound reaching the viewer from the screen unit 73 becomes better.

  Further, in the screen speaker system 10, after the signal output from the preamplifier 80 for each channel is branched at the branch points A, B, C, the signals are provided in the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b. The sound pressure level is adjusted by the output volume 88. For this reason, it is possible to easily adjust the sound pressure. Therefore, even when the indoor environment where the screen speaker system 10 is arranged changes, the sound pressure level can be adjusted quickly and easily.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be implemented in various modifications.

  In the above-described embodiment, after the acoustic signal is output for each channel by the preamplifier 80, the sound pressure level of the acoustic signal is output to the output volume 88 provided in the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b. However, the present invention is not limited to this. An output volume 88 is provided in the preamplifier 80, and after adjusting the sound pressure level of the acoustic signal upstream of the power amplifiers 85a, 85b, 86a, 86b, 87a, 87b, the acoustic signal is sent to each driver 50. May be output.

  In the above-described embodiment, the output volume 88 is individually adjusted. However, the present invention is not limited to this, and the upper channel regions 75a, 77a, 79a and the lower channels are not limited thereto. You may employ | adopt the structure which can adjust each six drive bodies 50 arrange | positioned at each of channel area | region 75b, 77b, 79b to the same output.

  In the above-described embodiment, six power amplifiers 85a, 85b, 86a, 86b, 87a, 87b are provided, but the present invention is not limited to this. For example, four power amplifiers may be provided, and the sound pressure levels of the three driving bodies 50 may be adjusted by each power amplifier. One power amplifier may be provided for each driver 50.

  In each of the above-described embodiments, the screen speaker system 10 is configured by joining four screen speakers 11. However, the present invention is not limited to this, and the number of screen speakers 11 may be five or more. And it is good also as three or less. Further, the size of the screen speaker 11 is not limited to 75 inches, and may be further increased or decreased. Further, the screen speaker system 10 may be configured by combining a plurality of screen speakers 11 having different sizes.

  In the above-described embodiments, the number of channels is three, that is, the left channel, the right channel, and the center channel. However, the number of channels is not limited to this, and may be two or less, or may be four or more.

  Further, in each of the above-described embodiments, three division portions 14a are provided inside the housing 14, but the number is not limited to this, and may be two or four or more. Furthermore, it is not necessary to divide. Alternatively, a plurality of middle rails 18 may be arranged in the lateral direction and the longitudinal direction of the side frame 17, and a portion surrounded only by the middle rails 18 may be used as the divided portion 14a. Accordingly, the number of driving bodies 50 arranged in the screen speaker system 10 may be 13 or more, or 11 or less.

  The screen speaker of the present invention can be used in an acoustic conversion device such as a speaker that emits sound from the entire surface of the screen.

It is a perspective view which shows the structure of the screen speaker which concerns on one embodiment of this invention. It is a perspective view which shows the state which removed the screen from the screen speaker which concerns on one embodiment of this invention. It is a figure which shows the structure of the basic unit of the screen speaker system which concerns on one embodiment of this invention. It is a figure which shows the structure of the wiring in the screen speaker system which concerns on one embodiment of this invention. It is a figure which shows the condition which performed volume adjustment in the screen speaker system which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Screen speaker system 12 ... Screen 50 ... Driver 80 ... Preamplifier 85a, 85b, 86a, 86b, 87a, 87b ... Power amplifier 88 ... Output volume

Claims (4)

In a screen speaker system having a screen for projecting an image by a projector and a driving body for driving the screen, and emitting sound from the screen,
At least two of the driving bodies are arranged in the vertical direction of the screen, and the driving body includes an output volume that changes an output of an acoustic signal inputted to the driving body arranged in the vertical direction. Screen speaker system.   2. The screen speaker system according to claim 1, wherein the screen and a screen speaker constituted by a part of the driver are used as one unit, and a plurality of the screen speakers are joined. The screen speaker system described.   The screen is formed with a divided region that is divided into a plurality of regions. A channel is assigned to each divided region, and a preamplifier that amplifies the acoustic signal for each channel and the preamplifier are output from the preamplifier. 3. The screen speaker system according to claim 1, further comprising: a power amplifier that amplifies the acoustic signal for each channel, wherein the output of the acoustic signal after the output from the preamplifier is changed.   The screen is formed with a divided region that is divided into a plurality of regions. A channel is assigned to each divided region, and a preamplifier that amplifies the acoustic signal for each channel and the preamplifier are output from the preamplifier. 3. A power amplifier that amplifies the acoustic signal for each of the channels, wherein the output volume changes an output of the acoustic signal before being input to the power amplifier. 4. Screen speaker system.

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