JP2004248203A - Sound tone illumination speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound tone illumination speaker which can be miniaturized and lightened and is improved in a visual effect and an acoustic effect. <P>SOLUTION: An acoustic signal generated in a sound source is outputted from a plane speaker 21 that is a piezoelectric ceramic speaker. The light emitting state of an LED 22 provided around the plane speaker 21 is controlled on the basis of the acoustic signal. Light emitted from the LED 22 is guided by a light guide plate 23 and reflected on a reflection plane 23a, and the direction wherein a user is located, is irradiated therewith. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tone illuminated speaker that changes a light emitting state of a light source such as an LED (light emitting diode) in conjunction with output sound.
[0002]
[Prior art]
Various devices using a musical effect or a visual effect may be used in order to attract publicity or interest of people. Further, a sound illumination device in which sound and light are linked has been developed aiming at a synergistic effect of these effects. For example, a neon tube or an LED is used as a light emitting device, and the light emitting state of the light emitting device is changed according to a change in output sound. The sound illumination device described in Patent Literature 1 has LEDs arranged in a matrix and a light emission control circuit that controls light emission of the LEDs in conjunction with an acoustic signal of an audio device, and corresponds to the volume and frequency of the acoustic signal. When the number and color of the LEDs that emit light are changed, or when the volume and frequency reach predetermined values, the LEDs emit light so as to form a predetermined planar geometric shape. This makes it possible to perform various kinds of illuminations having a correlation with the flowing music, and to maximize the synergistic effect of the musical effect and the visual effect.
[0003]
[Patent Document 1]
JP 2000-285709 A
[Problems to be solved by the invention]
2. Description of the Related Art Conventionally, a device for linking sound and light (hereinafter, referred to as a "tone illuminated speaker"), such as a conventional sound illumination device, may be configured such that a speaker for outputting sound and a light emitting device including a light source are separate bodies. Many require a large installation area. In some places, the light emitting device can be seen, but sound from the speaker is hard to hear or vice versa. For example, even if they are integrated as shown in FIG. 2 of Patent Document 1, the whole sound-tone illumination speaker becomes very large.
[0005]
Further, if the size of the light emitting device is increased in order to enhance the visual effect, it is necessary to increase the size of a member such as a wiring board for arranging the light sources, which increases costs.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a tone illuminated speaker which can be reduced in size and weight and has improved visual and acoustic effects.
[0007]
[Means for Solving the Problems]
The present invention provides a planar speaker that outputs an acoustic signal generated by a sound source,
A light source provided around the planar speaker;
A light guide plate that guides light emitted from the light source and irradiates the light in a predetermined direction,
A control unit that controls a light emitting state of the light source based on the acoustic signal.
[0008]
Further, the invention is characterized in that the flat speaker is a piezoelectric ceramic speaker.
[0009]
Further, in the invention, it is preferable that the light source includes light emitting diodes of a plurality of colors.
[0010]
According to the present invention, an acoustic signal generated by a sound source is output from a planar speaker that is a piezoelectric ceramic speaker, and a light emitting state of a light source provided around the planar speaker is controlled by a control unit based on the acoustic signal. You. Light emitted from the light source is guided by the light guide plate and emitted in a predetermined direction, for example, a direction where a user is present.
[0011]
A planar speaker typified by a piezoelectric ceramic speaker can be smaller and thinner than a conventional coil-type speaker, and also has an improved acoustic effect. By arranging the light source around the small and thin planar speaker, the area occupied by the speaker and the light source can be made very small, and the weight can be reduced. When the size of the light source is reduced, members such as a wiring board can be reduced, so that the cost can be reduced. However, since the visual effect is reduced when the light source is small, the present invention guides the light from the light source by providing the light guide plate and irradiates the light in a predetermined direction. A visual effect equivalent to using a conventional light emitting device of a size can be obtained.
[0012]
Further, in the present invention, the control unit has a filter for separating the acoustic signal into a plurality of frequency regions,
The filter and the light emitting diode are connected so that a light emitting diode of one color corresponds to one frequency region.
[0013]
According to the present invention, the control unit has a filter for separating the acoustic signal into a plurality of frequency regions, and the filter and the light emitting diode are arranged such that one color light emitting diode corresponds to one frequency region. It is connected.
[0014]
Thereby, the color of the light emitted changes according to the acoustic signal, and the visual effect is improved.
[0015]
Further, according to the present invention, the flat speaker has a disk-shaped vibrating portion,
The light source is provided in a ring shape near the outer periphery of the vibrating portion,
The light guide plate has a disk shape, is provided at a substantially central portion, is opened in a central axis direction, and has an area for accommodating the planar speaker and the light source, and an outer peripheral portion thereof has a predetermined shape for light emitted from the light source. Is formed.
[0016]
According to the present invention, the flat speaker has a disk-shaped vibrating portion containing a thin piezoelectric ceramic, and the light source is provided in a ring shape near the outer periphery of the vibrating portion.
[0017]
The light guide plate has a disk shape, is located substantially at the center, and accommodates a planar speaker and a light source in a region opened in the central axis direction. The light emitted from the light source is guided to the outer periphery of the light guide plate, and is reflected and emitted by a reflecting surface forming a predetermined angle with respect to the traveling direction of the light.
[0018]
By storing the flat speaker and the light source in the light guide plate, the waterproof and dustproof effects are improved. Further, by forming the reflection surface on the light guide plate, light emitted from the light source can be easily irradiated in a predetermined direction.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a configuration of a tone-tuned illuminated speaker 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the speaker unit 2 of the tone illuminated speaker 1. The tone illuminated speaker 1 has a speaker unit 2 and a circuit unit 3 as a control unit. The speaker unit 2 has a disk shape, houses a planar speaker 21 and an LED 22 as a light source in the center, and includes a light guide plate 23 around these. The circuit unit 3 includes a receiving circuit 31, a piezo amplifier 32, a constant level circuit 33, a filter 34, a driver 35, and a power supply 36.
[0020]
A transmission circuit for wirelessly transmitting an acoustic signal to the sound source is connected, and the transmitted acoustic signal is received by the receiving circuit 31. The received acoustic signal is sent to the piezo amplifier 32 and the level fixing circuit 33, respectively. The acoustic signal is amplified by the piezo amplifier 32 and applied to the planar speaker 21. The sound source may be any device that generates an acoustic signal, such as an existing CD (Compact Disk) player or radio. As the transmission circuit and the reception circuit 31, a communication circuit conforming to each wireless communication standard such as IEEE 802.11b or the Bluetooth standard is used.
[0021]
Here, the planar speaker 21 will be described in detail. The planar speaker 21 is a so-called piezo speaker, and utilizes the piezoelectric effect of a piezo element that is a piezoelectric ceramic element. FIG. 3 is a sectional view of the planar speaker 21. A thin disk-shaped piezoelectric ceramic element 21a, 21b having a diameter of about 50 mm and a thickness of about 0.125 mm sandwiches a brass electrode plate 21c having a diameter of 50 mm and a thickness of about 0.125 mm, and the circumference of the brass electrode plate 21c. A vibrating section is formed by providing a damper weight 21d made of an elastomer in the section. A vibration transmission shaft 22e is provided at the center of the piezoelectric ceramic elements 21a and 21b and the brass electrode plate 21c, and an attachment stud 22f is provided at an end of the vibration transmission shaft 22e. The attachment stud 22f and the diaphragm 22g are attached with an adhesive tape. As the vibration plate 22g, a flat plate-shaped plate which is often hit by hand and produces a good sound is used. For example, a styrofoam board, cardboard paper, decorative plywood, an acrylic board, or the like can be used.
[0022]
When the acoustic signal amplified by the piezo amplifier 32 is applied to the piezoelectric ceramic elements 21a and 21b, the piezoelectric ceramic elements 21a and 21b expand and contract according to the acoustic signal and vibrate in the axial direction of the vibration transmission shaft 22e. This vibration is transmitted to the vibration plate 22g via the vibration transmission shaft 22e and the attachment stud 22f, and the vibration plate vibrates air to output sound. The sound output direction is mainly the direction indicated by arrow A in FIG. 2 (hereinafter referred to as “front direction”).
[0023]
As shown in FIG. 2, a planar speaker 21 is provided substantially at the center of the speaker unit 2, and a ring-shaped LED 22 is provided therearound. The LED 22 is composed of a plurality of LEDs having different colors and a printed board for mounting the LEDs and supplying power via the driver 35 and the like. The color of each mounted LED corresponds to the frequency of the acoustic signal. I have. The acoustic signal sent from the receiving circuit 31 is always adjusted to a constant voltage level by the constant level circuit 33, and is input to the filter 34. The filter 34 includes a high sound filter 34a, a medium sound filter 34b, and a low sound filter 34c. A signal output from each filter is input to a driver 45, and an LED corresponding to each filter emits light. For example, the high frequency filter 34a corresponds to the green LEDg, the medium frequency filter 34b corresponds to the blue LEDb, and the low frequency filter 34c corresponds to the red LEDr. The treble filter 34a passes signals in the frequency domain of 4 kHz to 10 kHz, the middle filter 34b passes signals in the frequency domain of 600 Hz to 4 kHz, and the bass filter 34c passes signals in the frequency domain of 80 Hz to 600 Hz. Let it. Therefore, when a high tone is included in the acoustic signal, the green LEDg emits light, when a middle tone is included, the blue LEDb emits light, and when a low tone is included, the red LEDr emits light. . The driver 35 is realized by an AGC (Auto Gain Control) circuit or the like, and by slowing the rise and fall of the current supplied to each LED, the light emission and extinction of the LED is delayed so-called visual effect. Has been improved.
[0024]
The light emitted from each LED travels radially outward in the light guide plate 23, is provided on the outermost periphery of the light guide plate 23, and is reflected in the front direction by a reflection surface 23a that forms an angle of about 45 degrees with respect to the light traveling direction. I do. The light guide plate 23 may be any material having a light transmitting property, and for example, an acrylic plate or the like is used. In the figure, the reflection surface 23a is provided on the outermost periphery of the light guide plate 23. However, the invention is not limited thereto, and a plurality of reflection surfaces may be provided circumferentially at different radial positions. The processing of the reflection surface of the acrylic plate can be realized by existing laser processing or the like. In the above description, the angle of the reflecting surface 23a is set to about 45 degrees with respect to the traveling direction of light. However, the angle is not limited thereto, and it is sufficient that a user in the front direction, such as 30 degrees or 60 degrees, can observe light. . When a plurality of reflecting surfaces are provided, each reflecting surface may have the same angle or different angles. By appropriately setting the reflection surface angle and the reflection surface position, the visual effect can be improved.
[0025]
By integrating the vibration plate 22g and the light guide plate 23 with, for example, an acrylic plate, the confidentiality of the installation portion of the flat speaker 21 and the LED 22 is improved, and the waterproof and dustproofness is excellent. Even when reliable. In addition, various sensors can be provided in the speaker unit 2 due to improvement in confidentiality. For example, a human sensor using infrared rays or an illuminance sensor using a light receiving element can be incorporated. Thus, the operation can be performed when a person is detected or when the surroundings become dark, such as at night, and the visual effect and the sound effect can be improved by adapting to the surrounding environment.
[0026]
Further, a design panel 24 for displaying a product photograph, a logo mark, or the like may be provided on a side facing the diaphragm 22g. The design panel 24 can be visually recognized even when the surroundings are dark due to the light of the lit LED, by performing printing such that light is transmitted or engraving a logo mark.
[0027]
Further, the thickness of the speaker unit 2 can be substantially equal to the size of the flat speaker 21 plus the diaphragm 22g, so that, for example, a thickness of about 15 mm can be realized. By reducing the thickness, the weight can be reduced, and the installation position can be not only stationary but also wall-mounted, and can be used in various variations.
[0028]
In the above description, the LED is used as the light source. However, the present invention is not limited to this, and the same effect can be obtained by using an EL (Electro Luminescence) element, a strobe, or the like. Further, the shape of the speaker unit 2 is not limited to a disk shape, but may be a polygonal plate shape such as a square or a hexagon. Further, in the above description, the acoustic signal generated by the sound source is wirelessly transmitted to the receiving circuit 31, but an interface for connecting to the sound source by wire may be provided instead of the receiving circuit 31.
[0029]
【The invention's effect】
As described above, according to the present invention, the area occupied by the speaker and the light source can be made very small, and the weight can be reduced. Further, by providing the light guide plate, a visual effect equivalent to using a conventional light emitting device can be obtained.
[0030]
Further, according to the present invention, the color of the emitted light changes according to the acoustic signal, so that the visual effect is improved.
[0031]
Further, according to the present invention, the flat speaker and the light source are housed in the light guide plate, so that the waterproof and dustproof effects are improved. Further, by forming the reflection surface on the light guide plate, light emitted from the light source can be easily irradiated in a predetermined direction.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a tone-illuminated illuminated speaker 1 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the speaker unit 2 of the tone-lit electric speaker 1;
FIG. 3 is a cross-sectional view of the planar speaker 21.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tone illumination speaker 2 Speaker unit 3 Circuit unit 21 Flat speaker 22 LED22
23 Light guide plate 31 Receiving circuit 32 Piezo amplifier 33 Level constant circuit 34 Filter 35 Driver 36 Power supply

Claims (5)

A planar speaker that outputs an acoustic signal generated by the sound source;
A light source provided around the planar speaker;
A light guide plate that guides light emitted from the light source and irradiates the light in a predetermined direction,
A control unit for controlling a light emitting state of the light source based on the acoustic signal. The speaker according to claim 1, wherein the flat speaker is a piezoelectric ceramic speaker. The speaker according to claim 1, wherein the light source includes light-emitting diodes of a plurality of colors. The control unit has a filter that separates the acoustic signal into a plurality of frequency domains,
The tone illuminated speaker according to claim 3, wherein the filter and the light emitting diode are connected so that one color light emitting diode corresponds to one frequency region. The flat speaker has a disk-shaped vibrating portion,
The light source is provided in a ring shape near the outer periphery of the vibrating portion,
The light guide plate has a disk shape, is provided at a substantially central portion, is opened in a central axis direction, and has an area for accommodating the planar speaker and the light source, and an outer peripheral portion thereof has a predetermined shape for light emitted from the light source. The tone illuminated speaker according to any one of claims 1 to 4, wherein a reflection surface having an angle of?

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