JP2006235156A - Projector installation stand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector installation stand by which an acoustic system ensuring excellent acoustic effects can be easily organized in a small installation space. <P>SOLUTION: The projector installation stand 1 incorporates: a loudspeaker 9 that produces sounds of low-pitched areas; and an amplifier 10 for amplifying a sound signal supplied to a loudspeaker 9. The projector 30 installed on the stand 1 incorporates a DVD unit for playing DVD, and loudspeakers 46 and 47 for reproducing stereophonic sound. The sound signal outputted from the DVD unit of the projector 30 is inputted to an input terminal 14 via a sound cable 71 and supplied to the amplifier 10. Thus, an acoustic system of 2.1 channel is organized by the loudspeaker 9 of the stand 1 and the loudspeakers 46 and 47 of the projector 30 installed on the stand 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector installation stand that projects an image.

  FIG. 6 is a diagram illustrating one aspect of a situation in which the projector projects an image on the screen SC using a conventional projector installation stand. A projector 51 is installed on the top surface of the stand 50, and a DVD (Digital Versatile Disk) player 52 is installed in the middle stage, for example. The DVD player 52 is a video signal supply device that supplies a video signal representing video to the projector 51 via the cable 53. The projector 51 and the DVD player 52 are connected to an external power source 70 by connecting respective power cables 58 and 59 to conduct power.

  For example, when watching a movie recorded on a DVD using the projector 51, in order to reproduce a realistic sound, a separate stereo-compatible speaker 54, 55 and a subwoofer 56 are used for 2.1 channels. The sound system 60 was constructed. Connected to the speakers 54 and 55 and the subwoofer 56 are wirings 57 for transmitting an audio signal defining a sound from the DVD player 52. The subwoofer 56 has a built-in amplifier and a large-diameter speaker in order to obtain a large and high-quality sound in the low frequency range, and has a heavy and robust structure with an installation area equivalent to that of the stand 50.

  Patent Document 1 discloses a liquid crystal display for a personal computer provided with a small stereo-compatible speaker in front of the stand portion. This is to make it easier to hear the sound by providing a speaker on the surface facing the user of the personal computer.

Utility Model Registration No. 3043628

  However, since the acoustic system 60 in the conventional projector 51 requires separate speakers 54 and 55 and a subwoofer 56 corresponding to the stereo in addition to the stand 50 on which the projector 51 and the DVD player 52 are installed, there are many components. In addition to being difficult to transport, there was a problem that a large installation space was required. In particular, the subwoofer 56 is heavy and large, so it is difficult to transport and occupies most of the installation space. Furthermore, since the speakers 54 and 55 and the subwoofer 56 are all separate bodies, it is necessary to route the wiring 57 over a wide range, and installation is troublesome.

  Further, as a means for reducing the installation area of the acoustic system 60, for example, as in the configuration of the liquid crystal display of Patent Document 1, a stereo-compatible speaker is built in the main body of the projector 51, and a separate unit shown in FIG. It is conceivable to eliminate the stereo-compatible speakers 54 and 55. However, it has been difficult to incorporate the subwoofer in the main body of the projector 51. This is because there is not enough space to provide a large-diameter speaker in the main body of the projector 51, and even if it is forcibly built in, a problem such as a projection image blurring due to low-frequency vibrations occurs. It was from.

  In order to solve the above problems, an object of the present invention is to provide an installation stand for a projector that can easily construct an acoustic system having an excellent acoustic effect in a small installation space.

  In order to achieve the above object, an installation stand for a projector according to the present invention is a stand for installing a projector that projects an image, an installation plate for installing the projector, a main body that supports the installation plate, And a plurality of casters provided at the bottom of the main body, and the main body includes a speaker that emits a low frequency sound.

According to this configuration, since the speaker that emits low-frequency sound is built in the main body, a separate subwoofer having an installation area equivalent to that of the stand is required to construct a 2.1-channel acoustic system. Unlike the conventional stand, the projector installation stand alone has a subwoofer function. This eliminates the need for a separate subwoofer, thereby reducing the installation space.
Furthermore, by adding a stereo-compatible speaker to the installation stand, a 2.1 channel sound system can be easily constructed.
Therefore, it is possible to provide an installation stand for a projector that can easily construct an acoustic system having an excellent acoustic effect in a small installation space.

  The projector installation stand according to the present invention further includes a support column that supports the installation plate and is connected to the main body, and the support column is preferably provided so that the protruding length from the main body can be changed.

According to this configuration, since the column is provided so that the protruding length from the main body can be changed, the position of the installation plate supported by the column depends on the protruding length of the column from the main body. It becomes high. Therefore, the projector installed on the installation plate projects an image at a position corresponding to the height of the installation plate.
Therefore, it is possible to provide a projector installation stand that can project an image at a desired height.

  According to the projector installation stand according to the present invention, the installation board has a shelf between the installation plate and the support column on which an electronic device having the same size as the projector can be installed. It is preferable to provide a tilt mechanism for providing a tilt with respect to the main body as a fulcrum.

According to this configuration, since the installation shelf of the electronic device is provided between the installation plate and the support column, the video signal supply device, which is an electronic device that supplies a video signal or the like to the projector, can be installed on the shelf. it can. The stand on which the projector and the video signal supply device are installed can be easily moved by a caster.
Further, since the shelf includes a tilt mechanism for tilting the installation plate, the projector installed on the installation plate projects an image in a direction along the inclination of the installation plate.
Therefore, it is possible to provide a projector installation stand that can easily move a video projection system including a video signal supply device and a projector as a unit, and can project an image in a desired direction at the moved location.

  According to the projector installation stand according to the present invention, the installation plate further includes an elastic member, and the elastic member is preferably provided in a wider range than the installation range of the installation plate on which the projector is installed.

According to this configuration, since the elastic member is provided in a range wider than the installation range in which the projector on the installation plate is installed, the projector is installed on the elastic member. Since the elastic member has high elasticity, it has a large friction coefficient and absorbs vibration.
Therefore, the projector installed on the elastic member is securely installed on the installation plate so as not to slip. In addition, vibrations such as low-frequency vibrations caused by low-frequency sounds emitted from the main body are absorbed by the elastic member and are not transmitted to the projector, so that the image projected by the projector is not blurred.

  According to the projector installation stand according to the present invention, the main body includes a power cable for drawing in power from the outside, a plurality of outlets for distributing power supplied from the power cable, and an external electronic device including the projector. It is preferable to further include an input terminal unit that inputs an audio signal representing a sound supplied from the device, and an amplifier unit that amplifies the audio signal by the power supplied from the power cable and generates a sound from the speaker.

According to this configuration, since the main body unit has the plurality of outlets for distributing the power supplied from the power cable, the power can be supplied from the outlet to the projector and the video signal supply device installed on the stand. it can.
In addition, since an amplifier unit that amplifies an audio signal and generates a sound from a speaker is provided, a loud sound can be generated.
Therefore, it is possible to provide a projector installation stand in which the power cable can be easily wired, fits comfortably, and can obtain a large volume.

  According to the projector installation stand according to the present invention, the main body includes a resonance space for inverting the phase of the sound emitted from the back surface of the speaker, and an opening that emits a sound whose phase is inverted by the resonance space; It is preferable to further comprise.

According to this configuration, the main body unit is a bass reflex type (phase inversion type) speaker configured by a resonance space for inverting the phase of the sound and an opening for emitting the sound with the phase inverted. Because it is a box, the sound emitted from the main unit is superimposed on the sound emitted from the front of the speaker by superimposing the sound from the opening whose phase is reversed and in phase with the sound emitted from the front of the speaker. Becomes richer.
Therefore, it is possible to provide an installation stand for a projector that can construct an acoustic system with an excellent acoustic effect.

  According to the projector installation stand according to the present invention, the amplifier unit includes a low-pass filter circuit that allows only a frequency component equal to or lower than a predetermined frequency in the audio signal, a volume adjustment circuit for adjusting the amplification degree of the audio signal, The low pass filter circuit includes a bus adjustment switch for adjusting a set value of a predetermined frequency, and the volume adjustment circuit includes a volume adjustment switch for adjusting the volume of the volume adjustment circuit. Is preferred.

According to this configuration, the amplifier unit includes the bus adjustment switch for adjusting the set value of the predetermined frequency of the low-pass filter circuit, and the volume adjustment switch for adjusting the volume of the volume adjustment circuit. The amplifier unit amplifies a low-frequency sound signal having a frequency equal to or lower than the set frequency so as to obtain an adjusted sound volume, and supplies the amplified sound signal to the speaker.
Accordingly, it is possible to provide a projector installation stand that can obtain a low frequency in a desired frequency band at a desired volume.

  According to the projector installation stand according to the present invention, at least the bus adjustment switch and the volume adjustment switch are provided on the surface of the main body opposite to the direction in which the image is projected with the projector installed on the installation plate. Preferably it is.

According to this configuration, at least the bus adjustment switch and the volume adjustment switch are provided on the surface of the main body portion opposite to the direction in which the image is projected in a state where the projector is installed on the installation plate. The operator operates the bus adjustment switch and the volume adjustment switch with the front of the body facing in the direction of the projected image of the projector.
Therefore, it is possible to provide a projector installation stand capable of adjusting sound quality and volume while watching a projected image.

  According to the projector installation stand according to the present invention, it is preferable that the main unit further includes a speaker storage unit that stores a plurality of external speakers for constructing an acoustic system by being combined with the speaker.

According to this configuration, the main body unit further includes a speaker storage unit that stores a plurality of external speakers for constructing an acoustic system by being combined with the speakers, so that the plurality of external speakers are carried together with the main body unit. In addition, it is possible to construct an acoustic system in combination with a speaker in a transported place.
Therefore, it is possible to provide an installation stand for a projector that can easily construct an acoustic system having an excellent acoustic effect.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment)
<Outline of stand>
FIG. 1 is a perspective view from the front side of a projector installation stand according to an embodiment of the present invention. FIG. 2 is a perspective view from the back side of the projector installation stand. Here, an outline of a projector installation stand will be described with reference to FIGS. 1 and 2.
A stand 1 as a projector installation stand includes a top plate 2 as an installation plate, a shelf 3 as an installation shelf for an electronic device, a main body 4, a support column 25, a plurality of casters 11, and the like. .

The top plate 2 is a rectangular flat plate for installing a projector, and includes a pipe 5 and a vibration absorbing member 6.
The pipe 5 is, for example, a metallic pipe and is a stopper that limits the movable range of the projector in the side surface direction of the stand 1 so that the installed projector does not fall.
The vibration absorbing member 6 as an elastic member is installed in a wider range than the installation range in which the projector on the top surface of the top plate 2 is installed. The vibration absorbing member 6 is made of an elastic member such as silicone rubber having high elasticity and a large friction coefficient, and absorbs low-frequency vibration transmitted from the main body 4 or the like.

The shelf 3 includes a tilt knob 7 for adjusting the tilt mechanism and an installation space 8 for containing an electronic device.
The top plate 2 is provided with a hinge 26 on the side opposite to the opening of the installation space 8 and can be tilted by a tilt mechanism including the tilt knob 7 with the side as a fulcrum. In the tilt mechanism, when the tilt knob 7 is rotated, the pinion interlocked with the tilt knob 7 is rotated, and the rotational movement of the pinion is converted into a linear motion by a rack (none of which is shown) connected to the top plate 2. Thus, the top plate 2 is inclined. The projector is installed such that a projection lens that projects an image comes to the opening side of the installation space 8.
The installation space 8 has a capacity that can accommodate an electronic device having the same size as the projector.

The main body unit 4 includes a speaker 9, an amplifier unit 10, a storage shelf 12, a power cable 13, an input terminal unit 14, an opening unit 15, an outlet unit 16, an output terminal unit 17, a speaker storage unit 27, and the like.
The speaker 9 is a speaker that can efficiently generate low-frequency sounds. The speaker 9 is a speaker having a large diameter of, for example, 15 cm or more, and is fixed to the back surface of the main body 4 made of a robust material such as a gutter. An opening 15 is provided below the speaker 9.

The amplifier unit 10 includes a bass amplifying unit and an external output amplifying unit (both not shown). The low-frequency amplifier generates a low-frequency sound signal to be supplied to the speaker 9 that functions as a subwoofer in the acoustic system. The bass amplifying unit includes a power switch 18 for turning on / off the power of the amplifier unit 10, a low-pass filter circuit including a resistor and a capacitor for allowing only a frequency component equal to or lower than a predetermined frequency in the audio signal defining the sound, A volume adjustment circuit (not shown) including an operational amplifier for adjusting the amplification degree is included. The power switch 18 has a built-in LED that indicates whether the power is on or off by turning on and off.
The low-pass filter circuit includes a bus adjustment switch 19. The bus adjustment switch 19 is a rotary frequency changeover switch, and uses a predetermined frequency as an upper limit frequency that can pass through the low-pass filter circuit selected by the rotation as a set value of the low-pass filter circuit.
The volume adjustment circuit includes a volume adjustment switch 20. The volume adjustment switch 20 is a rotary volume adjustment switch, and sets the amplification degree of the amplifier corresponding to the position selected by the rotation to the amplification degree of the amplifier unit 10.

The audio signal is supplied to the amplifier unit 10 through the input terminal 14 from, for example, a DVD player installed on the shelf unit 3. The audio signal input to the amplifier unit 10 is converted into a low-frequency component audio signal along the set value of the bus adjustment switch 19 by the low-pass filter circuit, and the amplification adjusted by the volume adjustment switch 20 is amplified. It is supplied to the speaker 9.
The external output amplification unit uses the speaker 9 as a subwoofer and generates an audio signal to be supplied to the external speaker when the acoustic system is constructed by combining with the external speaker, and outputs the audio signal from the output terminal unit 17. The external output amplification unit includes an output volume adjustment circuit (not shown), a channel changeover switch 28, a volume adjustment switch unit 29, and the like.
The output volume adjustment circuit is an amplifier circuit including an operational amplifier, for example, amplifies and distributes a surround-compatible audio signal input from the input terminal unit 14 and outputs the amplified audio signal to the output terminal unit 17.

The channel changeover switch 28 is a changeover switch of an audio signal output to the output terminal unit 17. The audio signal can be switched in output corresponding to a 2.1 channel or 5.1 channel acoustic system.
An LED indicating which channel is selected is attached in the vicinity of the channel changeover switch 28, and the channel selection status can be identified.
The volume adjustment switch unit 29 is a switch for adjusting the amplification degree of the output volume adjustment circuit. The volume adjustment switch unit 29 is provided with at least two adjustment switches.
For example, when 5.1 channel is selected by the channel selector switch 28, one adjusts the volume of the front and rear speakers in the 5.1 channel sound system, and the other one is for the center speaker. Adjust the volume. Alternatively, in the case of a configuration with only front and rear speakers, the volume adjustment for the front and rear is performed.

The storage shelf 12 is a drawer-type shelf that can be stored in the main body 4. For example, when a presentation is performed using a notebook personal computer, the personal computer is placed on the storage shelf 12. In addition, a small storage shelf may be installed on the opposing surface of the main body 4. Thereby, a stereo-compatible speaker can be installed on each shelf.
The power cable 13 has an inlet at the tip. By inserting the inlet of the power cable 13 into an outlet to which a commercial power source is led, power is supplied to the amplifier section 10 and the plurality of outlet sections 16.
The input terminal unit 14 includes a plurality of input terminals for inputting audio signals from an audio signal supply device such as a DVD player installed on the shelf 3. The plurality of input terminals are 2RCA type pin jacks, stereo mini jacks, optical terminals corresponding to digital audio signals represented by S / PDIF (Sony / Philips Digital Interface Format) standards, and the like. The audio signal input from the input terminal unit 14 is sent to the amplifier unit 10.
The outlet section 16 includes at least three outlets as a plurality of outlets.

The output terminal unit 17 is an output terminal for outputting an audio signal from the external output amplification unit of the amplifier unit 10 to an external speaker. The output terminal unit 17 includes at least five output terminals. For example, in the case of constructing a 5.1 channel sound system, two outputs for front speakers, two outputs for rear speakers, and one for center speakers. Output terminals are assigned as output. When a 2.1 channel acoustic system is constructed, a stereo-compatible audio signal is output using two output terminals. Similarly to the input terminal unit 14, the output terminal unit 17 includes a 2RCA type pin jack, a stereo mini jack, an optical terminal, and the like.
The speaker storage unit 27 is a storage unit for storing external speakers. The speaker storage unit 27 stores two front speakers, two rear speakers, and one center speaker necessary for constructing a 5.1 channel sound system. Further, cables for connecting speakers, a small notebook personal computer, or the like may be accommodated.

  The support column 25 connects the top plate 2 and the shelf portion 3 to the main body portion 4, and further adjusts the height of the top plate 2 and the shelf portion 3 by changing the protruding length from the main body portion 4. The protruding length of the support column 25 is adjusted by rotating the crank 62. When the crank 62 is rotated, the interlocking pinion 64 provided inside the support column 25 rotates, and the protruding length of the support column 25 is adjusted by the rack 63 that converts the rotational motion of the pinion 64 into linear motion.

There are four casters 11, and each caster 11 is provided in the vicinity of each vertex on the bottom surface of the main body 4 having a substantially rectangular shape. The caster 11 is made of a robust material including metal, hard resin, and the like, and has a strength necessary to support the weight of the stand 1 and the projector installed on the stand 1.
Out of the four casters 11, the two casters 11 installed below the front surface on which the speaker 9 is installed are provided with stoppers 21 for stopping the rotation of the casters 11. When the stopper 21 is set in the stop direction, the caster 11 cannot rotate.

FIG. 3 is a side sectional view of the speaker 9 and the opening 15 of the main body 4. The audio signal amplified by the amplifier unit 10 is input to the speaker 9 via the cable 22.
A resonance space 23 for inverting the phase of sound emitted from the back surface of the speaker 9 is provided on the back surface of the speaker 9. The opening 15 emits a sound whose phase is inverted by the resonance space 23.
Thus, the main body 4 is a bass reflex type (phase inversion type) speaker box constituted by the resonance space 23 and the opening 15. In addition, since the low frequency sound emitted from the speaker 9 has poor directivity, the speaker box including the speaker 9 may be installed anywhere inside the main body unit 4.

<< One aspect of the usage status of the stand >>
FIG. 4 is a diagram illustrating an aspect of a situation in which the projector is projecting an image on the screen SC using the stand of the present invention. FIG. 5 is a schematic configuration diagram of the projector.
An aspect of the usage state of the stand 1 will be described with reference to FIGS. 4 and 5.

In FIG. 4, a projector 30 is installed on the top plate 2 of the stand 1. The projector 30 is a projector including a DVD unit for reproducing a DVD and stereo-compatible speakers 46 and 47.
AC power is supplied to the stand 1 from an external commercial power supply 70 via the power cable 13. The projector 30 operates by receiving power supply from the outlet section 16.

<Projector overview>
Here, a schematic configuration of the projector 30 will be described with reference to FIG.
The projector 30 separates the light emitted from the lamp 31 as the light source into three primary color components of red light, blue light, and green light, and each separated color light is included in the optical unit 32 for each color light. This is a so-called “liquid crystal three-plate projector” in which a liquid crystal light valve for each color light, which is a light modulation element, modulates in accordance with a video signal from a built-in DVD unit 44, and is synthesized again and projected onto a screen SC. In addition, the projector 30 can project video and reproduce audio by using a video signal and an audio signal input from an external video signal supply device 33 such as a personal computer, for example.

The projector 30 includes a lamp 31, an optical unit 32, an operation unit 34, a remote controller 35, a video signal processing unit 36, a liquid crystal panel drive unit 37, an operation receiving unit 38, a power supply unit 39, a lamp drive unit 40, a control unit 41, and a storage unit. 42, an I / O bridge unit 43, a DVD unit 44, an audio processing unit 45, speakers 46 and 47, an output terminal 48, and the like.
The lamp 31 is, for example, a discharge lamp capable of obtaining high luminance such as a high-pressure mercury lamp, a metal halide lamp, and a halogen lamp.
The optical unit 32 includes an integrator optical system that converts white light emitted from the lamp 31 into substantially parallel light having a stable luminance distribution, and red, green, and blue colors that are three primary colors of light. A separation optical system that separates light components and supplies them to a liquid crystal light valve for each color light, and a combination optical system that re-synthesizes each color light modulated according to the video signal for each color light by the liquid crystal light valve (whichever (Not shown).
The optical unit 32 projects a full-color image on the screen SC by projection light magnified by a projection lens that incorporates full-color, substantially parallel modulated light emitted from the combining optical system.

The operation unit 34 includes a plurality of operation buttons including a power button for activation (not shown) provided on the top surface of the exterior of the projector 30. The projector 30 is operated by these operation buttons.
The remote controller 35 is a remote controller that transmits an infrared signal including a plurality of operation buttons similar to the operation unit 34. By operating the remote controller 35, the projector 30 is remotely operated.

The video signal processing unit 36 applies the video signal to the video signal so that various video signal processings described later can be performed on the analog video signal supplied from the DVD unit 44 or the like via the I / O bridge unit 43. A video converter (not shown) that performs an A / D conversion process for converting an analog signal into a digital signal is included.
The video signal processing unit 36 writes video data into a video memory (none of which is shown) in order to make the video signal converted into a digital signal suitable for display on the liquid crystal light valve, Video signal processing such as reading under conditions is performed and output as a digital video signal. For video signal processing, it is suitable for scaling processing to match the resolution of the liquid crystal light valve by enlarging and reducing the video represented by the video signal and displaying the gradation value of the video signal with the liquid crystal light valve Γ correction processing for converting to a gradation value is included.

The liquid crystal panel driving unit 37 supplies the video signal input from the video signal processing unit 36 to the liquid crystal light valve (not shown) of the optical unit 32, the driving voltage, and the like, and displays the video on the liquid crystal light valve.
When an operation to the operation unit such as the remote controller 35 is performed, the operation reception unit 38 receives the operation and sends an operation signal serving as a trigger for various operations to the control unit 41.
The power source 39 is stabilized by guiding AC power from the external power source 70 from a plug, and performing transformation, rectification, and smoothing in a built-in AC / DC converter (none of which is shown). A DC voltage is supplied to each part of the projector 30.
The lamp driving unit 40 is supplied with power from the power supply unit 39, generates an high voltage to turn on the lamp 31 which is a discharge lamp, and forms a discharge path, and a stable lighting state after lighting. Is provided with a ballast circuit (none of which is shown).

The control unit 41 is a CPU (Central Processing Unit), and exchanges signals with each unit via the bus line Bus.
The storage unit 42 is configured by, for example, a non-volatile memory capable of rewriting data, such as a flash memory, or a mask ROM (Read Only Memory). The storage unit 42 stores various programs and accompanying data for controlling the operation of the projector 30 such as a startup routine for starting the projector 30 and a program for playing a DVD by the DVD unit 44. It is remembered.

The I / O bridge unit 43 includes an input selector unit and a south bridge unit (both not shown). For example, a plurality of video signals from a video signal supply device 33 such as a personal computer or a video signal from the DVD unit 44 is input to the input selector unit. The input selector unit selects one video signal from the plurality of video signals and outputs it to the video signal processing unit 36.
The south bridge unit is a south bridge, and includes a device controller for controlling the DVD unit 44.
The DVD unit 44 is a DVD playback device, plays back a set DVD, and sends the played video and audio signals to the I / O bridge unit 43.

The audio processing unit 45 includes an amplifier circuit including an operational amplifier and a branch circuit (none of which is shown) for branching the input audio signal to the output terminal 48. The audio signal supplied from the DVD unit 44 or the like is input to the audio processing unit 45 via the bus line Bus, amplified by the amplifier circuit, and supplied to the speakers 46 and 47. Further, the data is branched by the branch circuit and output from the output terminal 48.
The speakers 46 and 47 are tweeters that emit sounds in a high temperature range to a mid range, or stereo-compatible speakers equivalent to a squawker. The speakers 46 and 47 are installed such that each sound emission port extends over the top and side surfaces of the projector 30.
The output terminal 48 is a terminal for outputting an audio signal, for example, an optical terminal corresponding to a digital audio signal.

<< Acoustic system >>
An acoustic system including the above-described stand 1 and projector 30 will be described with reference to FIG.
The projector 30 reproduces a movie DVD with the DVD unit 44 (FIG. 5), projects the image onto the screen SC, reproduces the audio signal read from the DVD with the stereo-compatible speakers 46 and 47, and outputs the optical signal. The sound is input to the input terminal portion 14 of the stand 1 through an audio cable 71 made of fiber.
The audio signal input to the input terminal unit 14 becomes a low-frequency component audio signal in accordance with the set value of the bus adjustment switch 19 in the amplifier unit 10 of the stand 1, and is further amplified by the amplification adjusted by the volume adjustment switch 20. Is supplied to the speaker 9.
In this manner, a 2.1-channel sound system is constructed by the speakers 46 and 47 of the projector 30 and the speaker 9 of the stand 1.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since a 2.1 channel acoustic system is constructed by the speaker 9 of the stand 1 and the speakers 46 and 47 of the projector 30 installed on the stand 1, in order to construct the acoustic system, It is sufficient if there is a small space for the stand 1. Moreover, since the caster 11 is installed in the stand 1, it can be moved easily.
Therefore, it is possible to easily construct a 2.1 channel sound system in which a deep sound can be enjoyed in a small installation space.

The speaker 9 of the stand 1 is a large-diameter speaker suitable for generating low-frequency sounds, and is further installed in a bass reflex type speaker box composed of a resonance space 23 and an opening 15. Therefore, it emits a heavy bass.
In addition, the speakers 46 and 47 of the projector 30 emit sound over a wide range because the sound outlets are installed so as to extend over the top and side surfaces of the projector 30.
Therefore, it is possible to construct a 2.1 channel acoustic system with excellent acoustic effect.
Further, if one of the speakers 46 and 47 of the projector 30 is a tweeter for a high temperature range and the other is a squawker for a mid range, the three are combined with a low range woofer by the speaker 9 of the stand 1. An acoustic system using way speakers can be constructed.
Therefore, it is possible to provide a projector installation stand 1 that can easily construct an acoustic system having an excellent acoustic effect in a small installation space.

(2) The position of the top plate 2 of the stand 1 is set at a height corresponding to the protruding length of the support column 25 from the main body 4 adjusted by the crank 62. Furthermore, since the top plate 2 has a desired tilt by adjusting the tilt mechanism including the tilt knob 7, the image by the projector 30 installed on the top plate 2 is at the height at which the top plate 2 is installed, and The image is projected in a direction along the inclination of the top 2.
In addition, since the stand 1 includes the caster 11, the projection direction of the image of the installed projector 30 can be adjusted in the horizontal direction by changing the direction of the stand 1.
Therefore, it is possible to provide the projector installation stand 1 that can easily move the image projection system including the stand 1 and the projector 30 as a unit and can project an image in a desired direction at the moved location.

(3) Since the shelf portion 3 is provided between the top plate 2 and the main body portion 4, a desired video signal supply device that supplies a video signal or the like to the projector is installed on the shelf portion 3. Can do. The stand on which the projector and the video signal supply device are installed can be easily moved by a caster.
Therefore, it is possible to provide a projector installation stand 1 that can easily move a video projection system including a video signal supply device and a projector as a unit, and can project an image in a desired direction at the moved location. .

(4) Since the vibration absorbing member 6 is provided in a range wider than the installation range in which the projector on the top surface of the top plate 2 is installed, the projector 30 is installed on the vibration absorbing member 6. Since the vibration absorbing member 6 has high elasticity, it has a property of absorbing vibration. Moreover, since the friction coefficient is large, the thing installed on it is hard to slip.
Therefore, the projector 30 placed on the vibration absorbing member 6 is firmly installed on the top board 2 so as not to slip. In addition, vibrations such as low-frequency vibration caused by low-frequency sounds emitted from the main body 4 are absorbed by the vibration absorbing member 6 and are not transmitted to the projector 30, so that the image projected by the projector 30 is not blurred.
Accordingly, it is possible to provide a projector installation stand 1 that can firmly install the projector and obtain a stable projected image.

(5) Since the main unit 4 includes a plurality of outlets 16 for distributing the power supplied from the power cable 13, the power is supplied from the outlet 16 to the projector 30 and the video signal supply device installed in the stand 1. be able to.
In addition, since the amplifier unit 10 that amplifies the sound signal and generates the sound from the speaker 9 is provided, a loud sound can be generated.
Therefore, it is possible to provide the projector installation stand 1 in which the wiring of the power cable is simple, the accommodation is good, and a large volume can be obtained.

(6) The main body 4 is a bass-reflex type speaker box including a resonance space 23 for reversing the phase of the sound and an opening 15 for emitting the sound whose phase is reversed. The sound emitted from the main body 4 is superimposed on the sound emitted from the front surface of the speaker 9 by the sound from the opening portion 15 whose phase is reversed and in phase with the sound emitted from the front surface of the speaker. Become rich.
Therefore, it is possible to provide a projector installation stand 1 that can construct an acoustic system with an excellent acoustic effect.

(7) The amplifier unit 10 includes a bus adjustment switch 19 for adjusting a set value of a predetermined frequency of the low-pass filter circuit, and a volume adjustment switch 20 for adjusting the volume of the volume adjustment circuit. The unit 10 amplifies a low-frequency sound signal having a frequency equal to or lower than the set frequency so as to obtain an adjusted sound volume and supplies the amplified sound signal to the speaker 9.
Also, since the audio signal supplied from the projector 30 to the amplifier unit 10 is supplied via the audio cable 71 made of an optical fiber that is not easily affected by noise, a clear sound close to the original sound can be obtained.
Therefore, it is possible to provide a projector installation stand 1 that can obtain a clear bass in a desired frequency band at a desired volume.

(8) The amplifier unit 10 including the bus adjustment switch 19 and the volume adjustment switch 20 is provided on the surface of the main body unit 4 opposite to the direction in which an image is projected with the projector 30 installed on the top 2. Therefore, when the operator of the stand 1 performs various operations including operations of the bus adjustment switch 19 and the volume adjustment switch 20, the operator performs various operations with the front of the body facing the direction of the projected image of the projector 30. It becomes.
Therefore, it is possible to provide the projector installation stand 1 that can adjust the sound quality and the volume while watching the projected image.

(9) The stand 1 has a channel switch 28 for switching whether the audio signal output to the output terminal unit 17 is compatible with the 2.1 channel or 5.1 channel sound system, two front speakers, and rear speakers. Two storage units 27 for storing one center speaker and the like are provided.
Therefore, by connecting these external speakers to the output terminal unit 17, a 2.1 channel or 5.1 channel acoustic system can be easily constructed.
Therefore, it is possible to provide a projector installation stand 1 that can easily construct an acoustic system having an excellent acoustic effect in a small installation space.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
This will be described with reference to FIG. In the above embodiment, the stereo-compatible speaker is described as being built in the projector 30, but the present invention is not limited to this. For example, a storage shelf similar to the storage shelf 12 is provided on a surface facing the surface of the main body 4 on which the storage shelf 12 is provided, and a speaker is provided on each of the storage shelves 12. A speaker may appear. In this case, audio signals to the two speakers are connected in advance from the output terminal unit 17 to each speaker by a connection cable.
According to this configuration, it is possible to provide a projector installation stand that can easily construct an acoustic system having an excellent acoustic effect even when the projector 30 does not include a speaker.

(Modification 2)
In the above embodiment, when a 2.1 channel or 5.1 channel sound system is constructed by the channel changeover switch 28 and the external speaker housed in the housing portion 27, the sound is input from the external electronic device 30 to the input terminal portion 14. The audio signal may be guided by the optical cable and the optical terminal, and the audio signal output from the output terminal unit 17 may be supplied to the external speaker by the optical cable and the optical terminal.
According to this configuration, it is possible to construct an acoustic system with excellent sound quality with little transmission loss and noise.

(Modification 3)
In the embodiment and the modification, the projector 30 has been described as a liquid crystal three-plate projection type projector using three liquid crystal light valves as light modulation elements, but is not limited thereto. For example, a light modulation element of a projector uses a single-plate liquid crystal light valve capable of emitting full-color modulated light with one sheet, in which red, blue, and green color filters are regularly arranged in a lattice pattern. It may be. Further, a configuration using a reflective liquid crystal display device or a tilt mirror device may be used. Even if it is these structures, the effect similar to the said embodiment and each modification can be acquired.

The perspective view from the front side of the stand in one Embodiment. The perspective view from the back side of a stand. The sectional side view of the speaker of a main-body part and opening part periphery. The figure which shows the one aspect | mode of the usage condition of a stand. 1 is a schematic configuration diagram of a projector. The figure which shows the one aspect | mode of the usage condition of the conventional stand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stand as installation stand of projector, 2 ... Top plate as installation plate, 3 ... Shelf part as shelf, 4 ... Main part, 5 ... Pipe, 6 ... Vibration absorbing member as elastic member, 7 ... Tilt mechanism Tilt knob as one component part, 8 ... Installation space of electronic equipment, 9 ... Speaker, 10 ... Amplifier part, 11 ... Multiple casters, 12 ... Storage shelf, 13 ... Power cable, 14 ... Input terminal part, 15 ... Opening portion, 16 ... multiple outlets, 17 ... output terminal portion, 19 ... bus adjustment switch for low-pass filter circuit, 20 ... volume adjustment switch for volume adjustment circuit, 25 ... support, 27 ... speaker housing, 30 ... projector, 62 ... Crank, SC ... Screen.

Claims (9)

A stand for installing a projector for projecting images,
An installation plate for installing the projector;
A main body for supporting the installation plate;
A plurality of casters that support the main body and are provided at the bottom of the main body;
A projector installation stand characterized in that a speaker that emits low-frequency sound is built in the main body. Furthermore, the support plate is supported, and a support column connected to the main body is provided.
The projector installation stand according to claim 1, wherein the support column is provided so that a protruding length from the main body can be changed.   Between the said installation board and the said support | pillar, it has a shelf which can install the electronic apparatus of the magnitude | size equivalent to the said projector, The said shelf uses the said installation board as one side of the said installation board as a fulcrum, and the said main-body part The projector installation stand according to claim 1, further comprising a tilt mechanism for tilting the projector.   The said installation board has an elastic member further, and the said elastic member is provided in the range wider than the installation range in which the said projector of the said installation board is installed. The projector installation stand according to the item.   The main body includes a power cable for drawing in power from the outside, a plurality of outlets for distributing power supplied from the power cable, and sound representing sound supplied from an external electronic device including the projector The input terminal unit for inputting a signal, and the amplifier unit for amplifying the audio signal by the power supplied from the power cable and generating a sound from the speaker, further comprising: An installation stand for the projector according to item 1.   The said main-body part is further provided with the resonance space for reversing the phase of the sound emitted from the back surface of the said speaker, and the opening part which discharge | releases the sound by which the phase was reversed by the said resonance space. Item 6. The projector installation stand according to any one of Items 1 to 5. The amplifier unit includes a low-pass filter circuit that passes only a frequency component equal to or lower than a predetermined frequency in the audio signal, and a volume adjustment circuit for adjusting the amplification degree of the audio signal,
The low-pass filter circuit includes a bus adjustment switch for adjusting a set value of the predetermined frequency, and the volume adjustment circuit includes a volume adjustment switch for adjusting the volume of the volume adjustment circuit. The projector installation stand according to any one of claims 1 to 6.   At least the bus adjustment switch and the volume adjustment switch are provided on a surface of the main body opposite to a direction in which the image is projected in a state where the projector is installed on the installation plate. The projector installation stand of any one of Claims 1-6. The projector according to claim 1, wherein the main body further includes a speaker storage unit that stores a plurality of external speakers for constructing an acoustic system by being combined with the speaker. Installation stand.

Images