JPH0125016Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker system, and more particularly to a speaker system comprising a spherical sealed enclosure made of transparent glass.

Conventionally, with the aim of improving the performance of speaker systems, numerous improvements have been made to enclosures in terms of method and form in order to maximize the various characteristics of the speaker unit. As is well known, this enclosure is used to isolate the sound waves emitted from the rear of the speaker so that they do not interfere with the sound waves emitted from the front of the speaker.The enclosure is made of a dense fibrous material. Wood, metal, synthetic resin, etc. are generally used, and various shapes are known from a decorative point of view, such as a box shape, a box-like elf shape, and a spherical shape.Also, from a functional standpoint, there are various shapes such as a full board, an open back shape, and a sealed shape. Types such as shape, phase inversion, etc. are classified.

By the way, the role of the enclosure is to ensure that the frequency characteristics of the speaker system are even over a wide frequency band.
The purpose is to faithfully reproduce the original sound by changing the combination of various materials, shapes, methods, and the relationship between the diameter of the speaker unit and the volume of the enclosure, but the basic requirements for the enclosure are as follows: The enclosure must not vibrate due to the sound waves generated from the speaker unit. To achieve this, it is best to use heavy, hard, and thick materials, but depending on the size of the speaker system, the relationship between the diameter of the speaker unit and the volume of the enclosure, the ease of obtaining materials, and the economical efficiency of processing, etc. Limited. Furthermore, among these materials, materials with good damping vibration characteristics are suitable. It has also been found that the shape of the enclosure influences the sound diffraction effect, with a spherical enclosure providing the smoothest characteristic curve. Therefore, a spherical enclosure is optimal, but
Due to the difficulty of machining and other conditions, box-shaped enclosures with a tapered shape on the full surface account for most of the market.

By the way, the present inventor has repeatedly studied the above-mentioned speaker system, especially from the perspective of its usage, and has found that due to the diversification of lifestyles, audio equipment for hearing is becoming more and more popular. We have come to understand that the decorative meaning from a visual perspective is also becoming more important, and from this point of view, we have decided on the material and structure that should be selected for the enclosure, which is one of the audio equipment. We explored the difficulty of molding.

As a result, when colorless or colored transparent glass is used as a material, it is convenient for manufacturing spherical enclosures that have less influence on sound diffraction effects and have excellent various properties, and the material is hard and light. Therefore, it has been found that if a material with a certain thickness is used, vibrations of the enclosure itself can be sufficiently suppressed, and since it is made of transparent glass, it is also possible to obtain decorative effects not found in conventional products.

However, even the spherical enclosure made of transparent glass having the above-mentioned characteristics still has some problems that make it difficult to put it on the market as it is.
One of the problems is that since the spherical enclosure is a closed type, it has the disadvantage that the reproduction of low-frequency sounds tends to be insufficient if left as is.
Although this problem may be solved by increasing the spatial volume of the enclosure, it is generally difficult to manufacture a glass sphere that is too large and is therefore impractical. Furthermore, as has already been proposed for general spherical enclosures, in order to enhance the reproduction of low-frequency sounds, a single or multiple layer of sound-absorbing material is pasted on the inner surface of the enclosure, and the diaphragm of the speaker unit is In addition to attenuating the effects of standing waves caused by sound waves emitted from the back of the speaker system, it is also possible to lower the lowest resonant frequency of the speaker system and extend its characteristics to the bass range. It requires a considerable amount of time and experience to affix the inside of a spherical enclosure, reduces the space volume of the enclosure, and has the disadvantage of increasing variations in sound characteristics. The disadvantage is that the decorative meaning of the enclosure is completely lost.

The present invention solves these problems and simplifies the loading work of sound-absorbing materials while ensuring a stable sound-absorbing effect without reducing the sound-absorbing effect of the spherical enclosure, which is advantageous for faithfully reproducing the original sound. By making the enclosure made of transparent spherical glass, the vibrations generated by the sound waves of the speaker unit are reduced compared to wooden enclosures, and it has the same rigidity as metal at about one-third the weight of metal. Furthermore, it is an object of the present invention to provide a speaker system comprising a closed enclosure that also has a decorative effect in which, for example, decorations, light emitters, etc. inserted therein can be seen through from the outside.

The gist of the present invention is to attach a speaker unit to a cutout opening of a spherical enclosure made of transparent glass, and to attach a speaker unit to at least the center of the spherical enclosure with the inner peripheral surface of most of the enclosure. The present invention relates to a speaker system consisting of a sealed enclosure characterized by having a sound absorbing material fixed thereto while maintaining a space between the enclosures. It goes without saying that the glass of the enclosure base material may be colorless and transparent or colored and transparent as long as the above-mentioned effects can be obtained. Preferable examples of the sound absorbing material include a spherical material located at the center of the enclosure, or a columnar material extending from the back of the speaker unit to the inner surface of the enclosure opposite thereto.

The reason why the sound absorbing material is fixed at a position that includes the center of the spherical enclosure in this invention is that the sound waves radiated from the back of the speaker's diaphragm are reflected by the inner surface of the spherical enclosure and before returning to the back of the speaker. This is based on the fact that the part passes through the center of the spherical enclosure. Therefore, from this point of view, it will be understood that the size of the sound absorbing material can be made as small as possible as long as it satisfies the sound absorbing effect to increase the decorative or lighting effect.

The present invention will be explained below based on embodiments shown in the drawings. FIG. 1 is a sectional view of an embodiment in which the sound absorbing material is cylindrical. It is a spherical enclosure made of colorless and transparent glass, and the speaker unit 2 is assembled into an opening with a portion cut out. Then, a cylindrical sound absorbing material 3 made of glass wool is fixed so as to include the center C of the enclosure 1. 4 is speaker unit 2
It is an input conductor of the cylindrical sound absorbing material 3 and is passed through the cylindrical sound absorbing material 3. Note that the enclosure 1 is configured as a closed type, and the speaker system is placed and held on a cylindrical glass base 5 that is open at the top.

When the speaker system configured as described above is operated by connecting it to a known amplifier, and on the other hand, a glass wool sound absorbing material of the same mass is pasted to an approximately average thickness on the inner surface of a similar glass spherical enclosure 1. When compared with the previous model, a sufficient sound absorption effect was observed without any deterioration in sound quality.

Here, the relationship between the wall thickness of the glass spherical enclosure in the above-described embodiment and vibrations that affect sound quality will be considered.

Enclosure vibrations include vibrations transmitted by the part where the speaker unit is in direct contact with the enclosure, and vibrations due to the sound pressure emitted by the speaker unit. The former is transmitted to the enclosure when the same speaker unit is attached, regardless of the shape or material of the enclosure, but generally the influence of the former is very small. Next, let us consider the latter problem, vibration. FIG. 2 is a schematic diagram showing the movement of the speaker unit, and the solid line shows the state where no sound is produced. When it comes to producing mid- and high-frequency sounds, there is actually no big difference from the solid line. However, when producing low-frequency sounds, the shape shown by the broken line is used.
This change in the shape of the speaker unit will affect the sound pressure.

By the way, in general, in an enclosure with a volume of V, if we consider the case where a volume change of dV occurs in the shape of the speaker unit, the following formula: P×V=Px×(V-dV) Px=P×V/(V-dV ) The enclosure internal pressure P is as follows.
The internal pressure changes to Px, and this pressure change causes the enclosure to vibrate. Therefore, in the spherical enclosure shown in Fig. 1, the cone diameter of the circular speaker is a = 100mm, the same height H = 30mm, and the electroacoustic transducer ( Coil part) b = 60 mm, the same thickness dH = 5 mm, and as shown in Figure 3, the dimensions of the spherical enclosure are radius r = 125 mm, opening diameter a = 100 mm, and depth h = 240 mm. Maximum 5 in the coil section under typical usage conditions
If vibration of mm occurs, Px = 1.00127Kg/cm ²
becomes. Here, the stress σ experienced by a sphere of radius R and thickness t that is subjected to internal pressure P is σ = PR / 2.t Also, the strain δ is δ = σ / E, so the vibration due to the internal pressure of a spherical enclosure can be approximated as a true sphere. Considering this, the thickness t and the amount of strain δ
It is possible to find the relationship between

On the other hand, a general box-shaped enclosure as shown in Fig. 4 has the same internal volume as the spherical enclosure (c≒170 mm, d≒189 mm, e≒
Considering the maximum strain when subjected to the same internal pressure with a plate (254 mm, plate thickness ≒ 15 mm), this is calculated to be approximately 1.0 × 10 ^-7 cm.

Therefore, if the spherical enclosure is made of glass, the Young's modulus of the glass is E=7.14×
Since it is 10 ⁵ Kg/cm ² , the glass thickness t should be set to 1 mm or more in order to obtain the same or less strain at the same internal pressure. Of course, it is preferable for such a glass enclosure to have a predetermined thickness, for example, about 5 mm or more, from the viewpoint of ease of manufacturing and prevention of damage during handling. If constraints based on conditions other than vibration are satisfied, the requirement to reduce vibrations that affect sound quality is naturally satisfied.

Therefore, when implementing the present invention, it is possible to manufacture an enclosure that is extremely desirable in terms of sound quality by simply considering its durability and other aspects.

As mentioned above, according to this implementation, the sound quality is good, and since the enclosure is formed as a sphere made of transparent glass, the inside can be seen from the outside, and it has a decorative effect that has not been seen before. The benefit was that it became possible to generate In the present invention, other embodiments can be considered in which such decorative effects are further enhanced.

FIG. 5 is a sectional view of one such embodiment in which the sound absorbing material is spherical. 1' is a spherical enclosure made of light blue transparent glass, and 2 is a speaker unit. 3' is a spherical sound absorbing material made of glass wool, and enclosure 1'
It is held and fixed by a support rod 6 at a position that includes the center C'. Reference numeral 4 denotes an input conductor of the speaker unit 2, which is led out to the outside of the enclosure 1 along the support rod 6. This enclosure 1'
is constructed in a sealed manner. 5 is a cylindrical glass base on which the speaker system is mounted and held. When the speaker system of the example having such a configuration was also operated with a known amplifier, the desired sound absorption effect was obtained, and satisfactory characteristics as a speaker system were obtained.

FIG. 6 is a sectional view of an embodiment in which a light emitter that emits light in response to an audio signal from an amplifier is embedded in a cylindrical sound absorbing material. 1" is a spherical enclosure made of colorless and transparent glass; 2 is a speaker unit; 3" is a cylindrical sound absorbing material made of glass wool;
It is fixed at a position that includes the center C'' of the enclosure 1''. Further, a plurality of light sources connected to an AC cord 7 are embedded in the cylindrical sound absorbing material 3''. Reference numeral 4 designates an input conductor for the speaker unit 2, which is passed through the cylindrical sound absorbing material 3''. The enclosure 1 is constructed as a closed type. This speaker system is mounted and held on a cylindrical glass base 5 with an open top.

To explain the operation of the embodiment having such a configuration, FIG. 7 is a wiring diagram of the embodiment shown in FIG. The input signal is sent to a speaker unit 11 and a bandpass filter 12. The input signal is separated into high frequency, medium frequency, and low frequency by the bandpass filter 12, and each frequency is sent to an independent amplifier 13, where each frequency is amplified. The amplified low frequency signal changes the illuminance of the red light source, the medium frequency signal changes the illuminance of the green light source, and the high frequency signal changes the illuminance of the blue light source. A bandpass filter 12, an amplifier 13, and a color light source 14 are contained in a cylindrical sound absorbing material 3''.
It is buried so as not to be visible from the outside of the enclosure 1, and is connected to the power supply section. In addition, sound absorbing material 3″
Since the is made of glass wool, the light from the colored light source embedded therein passes through the sound absorbing material 3'' and is seen as colored light outside the enclosure.In other words, in the embodiment shown in FIG. Changes in the audio signal from the amplifier are expressed as changes in volume and timbre as well as changes in the intensity of light, making the decorative effect even more noticeable.

In addition, especially when the purpose is to create a decorative effect of light, a light emitting source such as a light emitting diode is pasted on the inner surface of a transparent glass enclosure, and a sound absorbing material is provided inside the enclosure on the entire inner surface and/or near the center. You can do it like this.

The glass spherical enclosure of the present invention described above is resistant to vibration even though it is thin, but its thickness is determined in consideration of damage prevention during handling such as transportation.
It is preferable to set it to about 5 mm or more. Further, in each embodiment, the speaker unit is placed on a cylindrical stand, but other methods such as hanging it in a bag-like net or fixing it in a wooden box are also possible. The shape of the sound absorbing material is not limited to columnar or spherical, but can be changed as appropriate within a range that does not interfere with the sound absorbing effect.

As described above, the present invention makes the enclosure made of transparent glass and has a spherical shape, and the sound absorbing material loaded therein is columnar or spherical, and the volume of the sound absorbing material is made as small as possible so that the enclosure behind the speaker unit By fixing the enclosure in a position that includes the center, it is possible to reduce the use of sound-absorbing materials and reduce costs without reducing the sound-absorbing effect, and the inner volume of the enclosure is increased to improve low sound quality. In addition, since the enclosure is transparent, it is possible to make it possible to see from the outside the decorations and the light source whose illuminance changes in response to the audio signals from the external amplifier, so it is possible to make it possible to see from the outside the light source that changes the illuminance in response to the audio signals from the external amplifier. This is a speaker system that also has a decorative effect.
Its practical advantages are enormous.

[Brief explanation of the drawing]

The drawings are for explaining the present invention; Fig. 1 is a longitudinal cross-sectional view of an embodiment in which the sound absorbing material is cylindrical, Fig. 2 is a schematic diagram showing the movement of the speaker unit, and Fig. 3 is a spherical sound absorbing material. A schematic cross-sectional view of the enclosure; Figure 4 is a perspective view of the box-shaped enclosure; Figure 5 is a schematic cross-sectional view of the enclosure;
The figure is a longitudinal sectional view of another embodiment in which the sound absorbing material is spherical, FIG. 6 is a longitudinal sectional view of yet another embodiment in which a lighting device is embedded in the sound absorbing material, and FIG. FIG. 3 is a wiring diagram of the embodiment shown in the figure. 1, 1', 1''...Glass spherical enclosure, 2...Speaker unit, 3...Cylindrical sound absorbing material, 3'...Spherical sound absorbing material, 3"...Cylindrical sound absorbing material, 4...Input Conductor, 5...stand, 6...support rod,
7...AC cord, 10...Speaker system side terminal, 11...Speaker unit, 12...
Bandpass filter, 13...Amplifier, 14...
...color light source.

Claims (1)

[Claims for Utility Model Registration] 1. A speaker unit is installed in a cutout opening of a spherical enclosure made of transparent glass, and a speaker unit is installed at least in the center of the spherical enclosure and between the inner circumferential surface of the majority of the enclosure. A speaker system consisting of a sealed enclosure characterized by holding space and fixing sound absorbing material. 2. The speaker system according to claim 1, wherein the sound absorbing material is spherical and located at the center of a spherical enclosure. 3. The speaker system according to claim 1, wherein the sound absorbing material is in the form of a column extending from the back of the speaker unit to the inner surface of the enclosure facing the speaker unit. .