Speaker device

Abstract

A loudspeaker device capable of high-fidelity playback with a simple structure is provided. The loudspeaker device includes: a loudspeaker unit (1) for outputting sound waves based on an input audio signal; a housing (2) having an opening (E1) and (E2) on one side and the other side; and a liquid container (3) containing a predetermined liquid L, wherein the loudspeaker unit (1) closes the opening (E1) on one side, such that its back side is exposed in the internal space (S) of the housing (2), and the opening (E2) on the other side is inserted into the liquid container (3), forming a gap (g) between the outer peripheral surface of the housing (2) and the inner peripheral surface of the liquid container (3), and the liquid (L) exists in the path from the internal space (S) of the housing (2) through the opening (E2) on the other side to the gap (g).

Description

Technical Field

[0001] This invention relates to a loudspeaker device. Background Technology

[0002] In the past, to achieve high-fidelity music playback, speaker devices that housed the speaker units in a housing were widely used.

[0003] When a speaker unit that is never housed in a housing plays sound, the inverted sound in the bass range with low vibration frequencies emitted from the back of the speaker unit bounces back to the front, interfering with and canceling out the inverted sound emitted from the front.

[0004] Therefore, the above-mentioned speaker units can only produce a weak playback sound with insufficient bass range and biased towards the high range.

[0005] To date, various housing designs have been developed to control the out-of-phase sound from the back of the speaker unit, and high-fidelity playback is constantly being attempted.

[0006] Currently, the main types of speaker enclosures on the market are sealed type and bass-reflex type.

[0007] A sealed type is a method of blocking out-of-phase sound that is harmful to the sound being played, by confining it within an acoustically sealed space.

[0008] A bass-reflex type is a type of speaker that uses a hollow tube formed in part of a sealed enclosure, called a bass-reflex port, to emit out-of-phase sound from the back of the speaker unit as if it were in phase with the front sound.

[0009] As mentioned above, speaker enclosure types have been developed and improved, primarily focusing on how to handle out-of-phase sound emanating from the back of the speaker unit without compromising the sound quality of the played sound.

[0010] For example, Patent Document 1 discloses a loudspeaker device that takes advantage of the difficulty of propagating sound waves in a depressurized space by depressurizing the air inside the housing to about one-tenth of the atmospheric pressure. Furthermore, by sealing the air inside the housing after depressurization, it eliminates in principle the cancellation and distortion vibrations caused by sound waves emitted inside the housing being reflected back to the vibrating plate by the inner wall of the housing and causing interference. It also plays with sufficient sound pressure and clear sound quality throughout the entire audible range.

[0011] Existing technical documents

[0012] Patent documents

[0013] Patent document 1: Japanese Patent Application Publication No. 2021-087187. Summary of the Invention

[0014] The problem that the invention aims to solve

[0015] However, sealed and bass-reflex speaker units have the following problems.

[0016] That is, in the sealed type, when the cone-shaped paper of the speaker unit housed in the shell vibrates to the front, the air pressure inside the shell becomes low pressure, and when the cone-shaped paper vibrates to the back, the air pressure inside the shell becomes high pressure.

[0017] As a result, the fluctuations in air pressure inside the casing act like an air spring on the conical paper, preventing it from faithfully following the signal current.

[0018] Increasing the size of the casing could mitigate this vibration interference to some extent, but the large size is a significant limitation in terms of practicality and cost.

[0019] Furthermore, in bass-reflex type, since the cone paper is directly connected to the voice coil, the direct playback sound emitted from the speaker unit is controlled by electromagnetic braking force to vibrate faithfully to the input waveform, but this electromagnetic braking force cannot be applied to the sound emitted from the bass-reflex port.

[0020] As a result, the bass-range sound emitted from the bass reflex port has a high sound pressure level, but poor transient response, and cannot be considered a high-fidelity playback sound.

[0021] Furthermore, in bass-reflex types, sounds outside the resonance point emitted from the bass reflex port (reflected sounds from complex reflections within the housing) interfere with positive-phase sounds from the front, thus impairing sound quality.

[0022] As mentioned above, sealed loudspeaker devices suffer from insufficient sound pressure in the low-frequency range and large size. While bass-reflex loudspeaker devices have solved the problem of insufficient low-frequency range in sealed loudspeakers to some extent, they suffer from sound quality degradation due to their specific structure.

[0023] In view of the above-mentioned actual situation, the purpose of the present invention is to provide a speaker device that can perform high-fidelity playback with a simple structure.

[0024] Technical solutions for solving technical problems

[0025] The present invention for solving the above problems includes: a speaker unit that outputs sound waves based on an input audio signal; a housing having openings on one side and the other side; and a liquid container for containing a predetermined liquid.

[0026] The speaker unit closes the opening on one side, leaving its back exposed inside the housing.

[0027] The open end on the other side is inserted into the liquid container.

[0028] A gap is formed between the outer peripheral surface of the shell and the inner peripheral surface of the liquid container, communicating with the outside of the liquid container.

[0029] The liquid exists in the path from the interior space of the shell through the opening on the other side to the outside.

[0030] According to the invention, the liquid exists in the path from the internal space of the housing through the open end on the other side to the gap, and the gas pressure in the internal space of the housing is connected to the external atmospheric pressure through the liquid.

[0031] Furthermore, the vibration of the speaker unit (conical paper) alters the air pressure inside the housing. This change in internal air pressure creates a pressure difference with atmospheric pressure, causing the liquid level inside the housing to rise or fall. As the liquid is pushed upwards or downwards, it flows in and out between the liquid containers, eliminating the pressure difference inside the housing until it eventually equalizes with atmospheric pressure.

[0032] This series of movements of the liquid inhibited the formation of the air spring.

[0033] That is, since the vibration energy of the conical paper is replaced by the potential energy of the liquid, the air spring is suppressed in the internal space of the shell, so the vibration of the conical paper is not affected.

[0034] Furthermore, the vibration of the cone-shaped paper in the speaker unit causes the liquid to vibrate from the internal space of the housing. However, since the acoustic impedance of the liquid is very different from that of the air, the phenomenon of sound energy in the housing being transmitted to the outside of the housing through the fluid can be ignored.

[0035] Therefore, the sound played from the speaker unit is not masked across the entire frequency range from bass to treble, has an excellent ability to play subtle signals, and produces a pure, delicate, and realistic sound.

[0036] Furthermore, as described above, according to the present invention, since the generation of air springs is suppressed, a large volume is not required, and the overall size of the housing can be miniaturized.

[0037] In a preferred embodiment of the invention, the open end on the other side is immersed in the liquid, and the liquid is exposed to the outside air through the gap.

[0038] By employing this structure, the sound emitted from the back of the cone-shaped paper is transmitted directly into the liquid, which enhances the effect of suppressing the air spring, thereby obtaining a more realistic sound quality.

[0039] In a preferred embodiment of the present invention, the liquid is a non-volatile liquid.

[0040] By adopting such a structure, the liquid can be used for a long time.

[0041] In a preferred embodiment of the present invention, a breathable filter element is provided in the gap.

[0042] By adopting such a structure, it is possible to suppress the mixing of impurities into the liquid.

[0043] In a preferred embodiment of the invention, the liquid container includes a switch valve for discharging the liquid.

[0044] By adopting such a structure, the movement and handling of the speaker unit becomes easy after the liquid is discharged.

[0045] In a preferred embodiment of the present invention, the housing includes a first housing having an opening on one side and a second housing having an opening on the other side, and the first housing and the second housing are detachably connected to each other.

[0046] By adopting such a structure, the first and second housings can be handled separately, thereby improving the convenience of movement / handling, storage, etc.

[0047] In a preferred embodiment of the invention, the liquid is sealed in a flexible bag, and the open end on the other side is closed by being placed on the bag.

[0048] By adopting such a structure, it is possible to reproduce sound with true-to-life quality using liquid, while also preventing liquid leakage.

[0049] Invention Effects

[0050] According to the present invention, a speaker device capable of high-fidelity playback with a simple structure can be provided. Attached Figure Description

[0051] Figure 1 This is a perspective view showing a loudspeaker device according to Embodiment 1 of the present invention.

[0052] Figure 2 This is a cross-sectional view of the PP wire of the loudspeaker device according to Embodiment 1 of the present invention.

[0053] Figure 3This is an explanatory diagram of the operation mode of the loudspeaker device according to Embodiment 1 of the present invention.

[0054] Figure 4 This is an explanatory diagram illustrating the usage of the loudspeaker device according to Embodiment 1 of the present invention.

[0055] Figure 5 This is a perspective view showing a loudspeaker device according to Embodiment 2 of the present invention.

[0056] Figure 6 This is a diagram showing a loudspeaker device according to Embodiment 2 of the present invention, wherein (a) is a plan view and (b) is a cross-sectional view along the QQ line.

[0057] Figure 7 This is a perspective view of the loudspeaker device according to Embodiment 3 of the present invention.

[0058] Figure 8 This is a cross-sectional view of the RR line of the loudspeaker device according to Embodiment 3 of the present invention.

[0059] Figure 9 This is an explanatory diagram illustrating the usage of the loudspeaker device according to Embodiment 3 of the present invention.

[0060] Figure 10 The figure shows a modified example of the loudspeaker device according to embodiments 1 and 2 of the present invention.

[0061] Figure 11 The figure shows a modified example of the loudspeaker device according to embodiments 1 and 2 of the present invention. Detailed Implementation

[0062] <Implementation Method 1>

[0063] The following will use Figures 1-4 The speaker device according to Embodiment 1 of the present invention will be described.

[0064] Note that the following embodiments are examples of the present invention, and the present invention is not limited to the following embodiments.

[0065] Furthermore, in these figures, the symbol W denotes a loudspeaker device according to this embodiment.

[0066] Note that the following embodiments are examples of the present invention, and the present invention is not limited to the following embodiments.

[0067] like Figure 1 as well as Figure 2 As shown, the loudspeaker device W includes: a loudspeaker unit 1 that outputs sound waves based on an input audio signal; a housing 2 that has open ends E1 and E2 on one side (above) and the other side (below); and a liquid container 3 that contains a predetermined liquid L.

[0068] Liquid L is preferably a non-volatile and chemically stable oil, and low-viscosity silicone oil is preferred.

[0069] In this embodiment, the speaker unit 1 has its opening end E1 closed, so that its back side is exposed to the internal space S of the housing 2.

[0070] In addition, the connection terminal j of the speaker unit 1 protrudes from the side of the housing 2.

[0071] Furthermore, as speaker unit 1, a cone speaker unit can be used, for example.

[0072] In this embodiment, the shell 2 is generally in the shape of an approximate cylinder extending in the vertical direction (in this embodiment, it is an approximate cylinder).

[0073] In addition, a plurality of spacers m are provided on the bottom surface of the shell 2, which are used to separate the bottom surface from the bottom surface of the liquid container 3 by a predetermined distance.

[0074] Furthermore, the width of the shell 2 in the left-right direction in the cross-sectional view is smaller than the width of the liquid container 3 in the left-right direction in the cross-sectional view.

[0075] Note that the spacer m can be pre-installed on the housing 2 or the liquid container 3, or it can be installed separately from them.

[0076] In this embodiment, the liquid container 3 is an upward-opening, bottom-filled, approximately cylindrical body, into which a certain amount of liquid L is injected.

[0077] Here, especially as Figure 2 As shown, the open end E2 is immersed in liquid L.

[0078] Specifically, the lower part of the shell 2, including the open end E2, is immersed in the liquid L, so that the liquid L enters the internal space S through the open end E2.

[0079] Furthermore, a gap g is formed throughout the entire circumference between the outer peripheral surface of the shell 2 and the inner peripheral surface of the liquid container 3, and a breathable filter element f is provided in the gap g.

[0080] Specifically, the filter element f, for example, is an approximately annular component formed of a sponge or the like, and is configured to fill the gap g while maintaining air permeability.

[0081] By configuring the speaker device W as described above, the liquid L exists in the path R from the internal space S through the opening end E2 to the gap g.

[0082] The following will refer to Figure 3 and Figure 4 Explain how to use the loudspeaker device W.

[0083] like Figure 3 As shown, when a predetermined audio device (not shown) is connected to the connection terminal j to play music, the liquid L in the internal space S flows out or in through the opening end E2 through the positive or negative pressure generated by the vibration of the conical paper, thereby suppressing the generation of the air spring.

[0084] Specifically, such as Figure 3 As shown in (a), when the conical paper vibrates in the direction of the internal space S, the air pressure in the internal space S rises. At this time, the liquid L that enters the internal space S is pushed down, and the pushed-down liquid L flows out through the opening end E2 to the liquid container 3, so that the air pressure in the internal space S is equal to the external air pressure.

[0085] In addition, such as Figure 3 As shown in (b), when the conical paper vibrates in the opposite direction to the internal space S, the air pressure in the internal space S decreases. At this time, the external air pressure pushes the liquid L directly below the gap g downwards and pushes the liquid L entering the internal space S upwards. The liquid L flows into the internal space S through the opening end E2, making the air pressure in the internal space S equal to the external air pressure.

[0086] As described above, since the liquid level of the liquid L in the internal space S moves up and down according to the vibration of the conical paper, the air pressure in the internal space S is kept equal to the external air pressure, and the generation of the air spring that hinders the vibration of the conical paper is suppressed.

[0087] Furthermore, the antiphase sound from the back of the cone-shaped paper is replaced by potential energy that causes the liquid L to move up and down, and therefore is not emitted to the outside as sound energy.

[0088] Furthermore, due to the significant difference in acoustic impedance between air and fluid, the sound from the back of the cone-shaped paper does not propagate to the outside through the liquid L.

[0089] Furthermore, when the speaker unit W is moved or transported, the user only needs to remove the filter component f( Figure 4 (a) and lift the shell 2 upwards. Figure 4 (b) is sufficient.

[0090] Therefore, the user can separate the housing 2 (and speaker unit 1) from the liquid container 3.

[0091] As described above, according to this embodiment, the liquid L suppresses the generation of the air spring, and the sound played is only the positive phase component from the front of the cone paper. It is not masked across the entire frequency band from bass to treble, and has an excellent ability to play small signals, resulting in a pure, delicate, and realistic sound quality.

[0092] Furthermore, as mentioned above, since the generation of the air spring is suppressed, the size of the entire housing 2 can be reduced.

[0093] Furthermore, since the open end E2 is immersed in the liquid L, and the liquid L is exposed to the outside air through the gap g, the sound pressure on the back of the cone paper acts directly on the liquid L, which can effectively suppress the air spring and obtain a playback sound with more realistic sound quality.

[0094] Furthermore, since liquid L is non-volatile, it can be used for a long time.

[0095] Furthermore, by providing a breathable filter element f in the gap g, it is possible to prevent impurities from entering the liquid L.

[0096] <Implementation Method 2>

[0097] The following will refer to Figure 5 and Figure 6 The speaker device according to Embodiment 2 of the present invention will be described.

[0098] Furthermore, in this embodiment, components that are substantially the same as those in the aforementioned embodiments are indicated by the same reference numerals to simplify the description.

[0099] Furthermore, in these figures, reference numeral X indicates the speaker device of this embodiment.

[0100] like Figure 5 and Figure 6 As shown, the loudspeaker device X includes a loudspeaker unit 1, a housing 2, and a liquid container 3 containing liquid L. The housing 2 has open ends E1 and E2 on one side (front) and the other side (bottom rear).

[0101] In this embodiment, the plate-shaped body forming the open end E1 in the housing 2 is used as a speaker baffle.

[0102] In addition, Figure 6 The shading of liquid L is omitted in the text, and... Figure 6 In (b), each support device n described later is indicated by shading.

[0103] In this embodiment, the connection terminal j of the speaker unit 1 protrudes from the back of the first housing 21, which will be described later.

[0104] In this embodiment, the housing 2 includes a first housing 21 with an open end E1 and a second housing 22 with an open end E2.

[0105] The first housing 21 is a box-shaped body that is approximately rectangular, and has a connecting hole p1 at its bottom except for the open end E1.

[0106] The second housing 22 has a stepped shape by connecting two approximately cuboid cylindrical bodies, and in addition to the open end E2, a connecting hole p2 is provided on its front surface.

[0107] Here, the first housing 21 and the second housing 22 are detachably connected to each other.

[0108] Specifically, when the connecting holes p1 and p2 are connected, that is, when the first housing 21 is placed on the stepped portion of the second housing 22, the first housing 21 and the second housing 22 are connected by four connecting devices t.

[0109] Each connecting device t is a screw member that extends from each side of the first housing 21 to each side of the second housing 22 that is inserted into the first housing 21.

[0110] Furthermore, there are no particular restrictions on the installation location and number of each connecting device t, and the construction of the connecting device t is not limited to the construction of this embodiment, as long as the method is known.

[0111] In addition, in order to improve the airtightness of the internal space S, filler or the like can be provided at the adjacent position between the first shell 21 and the second shell 22.

[0112] In addition, the second housing 22 is hollowly supported in the liquid container 3 by a plurality of support devices n.

[0113] Specifically, the support device n is a plate-shaped metal fitting, which is respectively set at the four corners inside the liquid container 3. Each support device n abuts against the bottom and corners of the liquid container 3, and is placed on the upper part of one end face, and is connected to the outer peripheral surface of the second shell 22.

[0114] In this embodiment, the liquid container 3 is an approximately cuboid container that opens upwards and is filled with a certain amount of liquid L.

[0115] By configuring the speaker device X as described above, the liquid L exists in the path R from the internal space S through the opening end E2 to the gap g.

[0116] Furthermore, the structure of the filter element f disposed in the gap g is the same as in Embodiment 1.

[0117] In the speaker device X of this embodiment, when music is played, based on the same principle as the speaker device W of embodiment 1, the liquid level of the liquid L in the internal space S moves up and down according to the vibration of the conical paper, thereby suppressing the generation of the air spring.

[0118] Furthermore, when changing the fluid L, moving / transferring the speaker device W, etc., the user can remove each screw t and move the first housing 21 and the second housing 22 upward together with each support device n.

[0119] Therefore, the user can separate the housing 2 (and speaker unit 1) from the liquid container 3.

[0120] As described above, according to this embodiment, in addition to achieving the same effect as in Embodiment 1, the speaker unit 1 can be configured to face forward like a normal speaker device, and the housing 2 and liquid container 3 can be handled separately, thereby improving the convenience of moving, setting up / carrying, and storing.

[0121] <Implementation Method 3>

[0122] The following will refer to Figures 7-9 The speaker device according to Embodiment 3 of the present invention will be described.

[0123] Furthermore, in this embodiment, components that are substantially the same as those in the aforementioned embodiments are indicated by the same reference numerals to simplify the description.

[0124] Furthermore, in these figures, reference numeral Y denotes the loudspeaker device of this embodiment.

[0125] like Figure 7 and Figure 8 As shown, the loudspeaker device Y includes a loudspeaker unit 1, a housing 2, and a liquid container 3 containing liquid L, wherein the housing 2 is provided with open ends E1 and E2 on one side (front) and the other side (bottom rear).

[0126] In this embodiment, the liquid L is slowly sealed within a flexible bag A. In other words, the amount of liquid L in the bag A is a predetermined amount that does not generate tension on the surface of the bag A.

[0127] Furthermore, bag A in a sealed state containing liquid L, especially as Figure 8 As shown, it is contained within the liquid container 3 in a state where it covers the entire bottom surface of the liquid container 3 and its outer circumference (side surface) is in contact with the inner circumference of the liquid container 3.

[0128] Furthermore, resin material is preferably used as the material for bag body A.

[0129] Similar to Embodiment 1, the shell 2 in this embodiment is an approximately cylindrical body.

[0130] In addition, the housing 2 has protruding portions h that project outward from its outer periphery in four directions.

[0131] Thus, by placing each protruding part h on the edge of the opening of the liquid container 3, the shell 2 is inserted into the liquid container 3 with the opening end E2 spaced a predetermined distance from the bottom surface of the liquid container 3.

[0132] Here, in this embodiment, since the bag A, which is sealed with liquid L, is contained in the liquid container 3, therefore, especially as Figure 8 As shown, the shell 2 is inserted into the liquid container 3 while the bag body A is being deformed by pressing it at its open end E2.

[0133] Therefore, when the shell 2 is placed on the bag body A, the opening on the open end E2 side is closed by the bag body A, and the internal space S becomes sealed.

[0134] Furthermore, as described above, since the liquid L is slowly sealed within the bag A, no tension caused by the liquid L is generated on the upper surface of the bag A, and as... Figure 8 As shown, except for the pressed and deformed part, the upper surface of the opening on the closed opening end E2 side is basically parallel to the bottom surface of the liquid container 3.

[0135] In addition, such as Figure 8 As shown, liquid L is sealed in bag A by filling the space between the open end E2 and the bottom surface of liquid container 3 through bag A. However, as long as the conical paper can maintain a sealed state even if it vibrates, the amount of liquid L can be less than this amount.

[0136] With the speaker device Y configured as described above, the liquid L and the bag body A exist in the path R from the internal space S through the opening end E2 to the gap g.

[0137] Furthermore, the structures of the speaker unit 1 and the liquid container 3 are the same as in Embodiment 1. Additionally, in this embodiment, the spacer m and the filter element f are not required.

[0138] Although not shown in the figure, in the speaker device Y of this embodiment, when music is played, according to the same principle as the speaker device W of embodiment 1, the liquid level of the liquid L in the bag A sealed in the internal space S moves up and down according to the vibration of the conical paper, thereby suppressing the generation of the air spring.

[0139] Furthermore, when replacing the bag body A, moving / transporting the speaker unit Y, etc., the user only needs to move the housing 2 (and speaker unit 1) upwards. Figure 9 ).

[0140] Therefore, the user can separate the housing 2 (and speaker unit 1) from the liquid container 3.

[0141] As described above, according to this embodiment, similar to Embodiment 1, the sound quality can be reproduced accurately by using liquid L, while preventing leakage of liquid L.

[0142] <Variation Example>

[0143] Furthermore, the shape, size, etc. of each component described in the above embodiments are merely examples and can be changed in various ways based on design requirements, etc.

[0144] For example, such as Figure 10 As shown, the liquid container 3 in the speaker device W and speaker device X may include a switching valve v for discharging liquid L.

[0145] As a result, the movement / transportation of liquid L becomes easier.

[0146] In addition, existing shell types, such as Kelton type and front-loaded horn type, have a portion of their structure consisting of a sealed shell.

[0147] By replacing the sealed housing portion of these models with the type of speaker unit X, the playback sound quality of these models has been improved.

[0148] In addition, the loudspeaker device W can be as follows Figure 11 The changes are shown.

[0149] That is, in the housing 2, a membrane u1 that is pleated (wrinkled), impermeable to liquid L but easily transmits air pressure can be disposed parallel to the speaker unit 1 in the internal space S between the speaker unit 1 and the liquid surface.

[0150] Similarly, a pleated (wrinkled) membrane u2 can be set in the gap g.

[0151] Furthermore, membranes u1 and u2 can be formed from resin, for example.

[0152] Therefore, the internal space S is divided into internal space S1 and internal space S2 by the membrane u1.

[0153] At this time, the internal space S1 is sealed by membrane u1 and is in a closed state. Similarly, the internal space S2 is also sealed by membrane u1 and is in a closed state.

[0154] Furthermore, since membrane u1 can transmit air pressure well, the internal spaces S1 and S2 operate as a whole to cope with changes in air pressure.

[0155] Furthermore, since the membrane u2 also allows for good propagation of air pressure, the liquid L between the outer peripheral surface of the shell 2 and the inner peripheral surface of the liquid container 3 is exposed to atmospheric pressure through the membrane u2.

[0156] Thus, by utilizing membranes u1 and u2 that are impermeable to liquid L but can transmit gas pressure well, through... Figure 1 Using the same principle as the speaker device W shown, the up-and-down movement of the liquid L can suppress the generation of the air spring, achieve true sound quality reproduction, and prevent the leakage of the liquid L.

[0157] Furthermore, in this variant, the filter component f is not required.

[0158] Furthermore, this variation can also be applied to loudspeaker device X.

[0159] Furthermore, by connecting speaker units W to Y to a low-pass filter and a power amplifier for bass reproduction, speaker units W to Y can be used as a so-called subwoofer.

[0160] Furthermore, in speaker devices W and X, as in speaker device Y, liquid L sealed in bag A can be used.

[0161] Furthermore, the term "approximately" in the application is a concept that includes indicating that the subsequent shape has been chamfered or rounded, and that the elements constituting the shape are permissible to be deformed or have their length changed to the extent that it does not impair the purpose of the shape.

[0162] <Supplementary Notes>

[0163] Here, the structure and operating mode for achieving excellent sound quality will be explained in detail below.

[0164] <<The Role of Liquids in the Path>>

[0165] By having liquid in the path, the vibrational energy of the cone paper in the speaker unit is replaced by the potential energy of the liquid, and the air spring is suppressed in the internal space of the housing, so it does not hinder the vibration of the cone paper.

[0166] Furthermore, although the vibration of the conical paper causes the liquid to vibrate from the internal space of the shell, the phenomenon of sound energy in the shell being transmitted to the outside of the shell through the fluid can be ignored because the acoustic impedance of the liquid is very different from that in the air.

[0167] Therefore, it is possible to obtain a playback sound with true-to-life sound quality, consisting only of the positive-phase sound in front of the cone paper.

[0168] <<The Role of Gap Formation>>

[0169] In this invention, a gap is formed over its entire circumference between the outer peripheral surface of the shell and the inner peripheral surface of the liquid container, thereby increasing the surface area of ​​the liquid exposed to the atmosphere.

[0170] Furthermore, although the generation of air springs in the housing caused by the vibration of the conical paper can be suppressed by the movement of the liquid, the rapid movement of the liquid can suppress the air springs better if the surface area of ​​the liquid exposed to the atmosphere is large enough.

[0171] <<The role of miniaturization and the surface area of ​​the liquid inside the casing>>

[0172] In this invention, since there is liquid in the path leading to the outside, the housing must be made as small in volume and miniaturized as possible in order to suppress the generation of air springs.

[0173] The force that moves a liquid is the product of the surface area of ​​the liquid inside the shell and the pressure per unit area on the liquid surface.

[0174] As the volume of the shell increases, the gas pressure per unit volume decreases inversely proportional to the volume, thus reducing the gas pressure per unit area acting on the liquid surface inside the shell.

[0175] Reducing the air pressure acting on the liquid cannot make the liquid move effectively in the same phase as the vibration of the conical paper, and the air spring cannot be sufficiently suppressed.

[0176] Furthermore, when the liquid surface area inside the shell is smaller than the vibrating area of ​​the conical paper, the force moving the liquid decreases proportionally to the reduction in liquid surface area. If the decrease in unit volume air pressure caused by the internal volume of the shell is ignored, then when the liquid surface area is equal to the surface area of ​​the conical paper, the liquid surface will experience the same air pressure as the vibrating conical paper.

[0177] When the shell is small and the surface area of ​​the liquid inside the shell is equal to the area of ​​the conical paper, the vibrational energy of the conical paper acts on the liquid surface without any surplus, causing the liquid to move rapidly at the same phase as the conical paper.

[0178] When the volume of the shell is not small enough, or the surface area of ​​the liquid in the shell is smaller than the area of ​​the conical paper, the liquid does not move in the same phase as the vibration of the conical paper.

[0179] When the liquid does not move in the same phase as the vibration of the conical paper, it not only fails to suppress the generation of the air spring, but also increases distortion and reduces sound quality.

[0180] When the internal volume of the shell is small enough and the surface area of ​​the liquid inside the shell is equal to the vibrating area of ​​the conical paper, the liquid surface is subjected to air pressure equal to the vibration energy of the conical paper, and moves along the path inside and outside the shell. The air pressure inside the shell is equal to the atmospheric pressure, and the air spring does not function.

[0181] In order for the liquid to move in the same phase as the vibration of the conical paper and to suppress the air spring, it is extremely important that the volume of the housing be small and the surface area of ​​the liquid in the housing be equal to the area of ​​the conical paper.

[0182] In this invention, the lower part of the shell is accommodated (inserted) in a liquid container, which can easily ensure sufficient surface area of ​​the liquid in the shell while miniaturizing it.

[0183] In this invention, by achieving the aforementioned miniaturization and ensuring compatibility with the liquid surface area in a shell equivalent to a conical paper, the generation of air springs can be more effectively suppressed by the rapid movement of liquid based on the above design.

[0184] <<Summary>>

[0185] As described above, the present invention focuses on using liquid to suppress the generation of air springs, and while achieving this appropriately, the various structures cooperate to enable the liquid to move rapidly, thereby not only improving the sound quality of the played sound, but also exhibiting a unique synergistic effect of miniaturization of the speaker device, which is not found in the referenced documents.

[0186] Especially in traditional loudspeaker devices, the following problems may occur.

[0187] Small, sealed loudspeakers have poor bass quality because the air springs suppress the movement of the cone-shaped paper, resulting in a muffled sound.

[0188] Large, sealed loudspeakers have reduced air springs, allowing them to reproduce rich bass, but they are difficult to install in most homes.

[0189] • Flat baffle speakers without a housing have no function of air springs. The sound is clear and crisp and will not be drowned out by other sounds, but there are problems such as interference from back-phase sound and inability to play bass.

[0190] In contrast, the invention of this application focuses on this point: as long as the air spring is not in use, even with a small housing, one can obtain a rich bass like that of a large speaker, as well as the clear, transparent sound quality characteristic of a flat baffle.

[0191] That is, in traditional large sealed loudspeaker devices, the pressure per unit volume is reduced by increasing its internal volume, and the change in pressure per unit volume is reduced to a negligible level equal to the strength of the air spring. Therefore, in order to improve sound quality, the size of the device is inevitably increased.

[0192] In contrast, this invention does not adhere to conventional wisdom but instead takes a different approach. It is a novel type of speaker device that achieves better sound quality by moving the liquid in the same phase as the vibration of a conical paper, thus becoming a sealed type, and by making the volume smaller.

[0193] Symbol Explanation

[0194] W~Y…… Loudspeaker assembly

[0195] 1………… Loudspeaker unit

[0196] 2………… Shell

[0197] E1, E2... Open end

[0198] 3………… Liquid containers

[0199] S………… Internal space

[0200] g………… gap

[0201] L………… Liquid

[0202] A………… Bag body.

Claims

1. A loudspeaker device, comprising: - A speaker unit that outputs sound waves based on the input audio signal; - A housing having open ends on one and the other sides; as well as - A liquid container that opens upwards and contains a predetermined liquid. The speaker unit has its opening on one side closed, leaving the back of the speaker unit exposed within the interior space of the housing. The open end on the other side is inserted into the liquid container. A gap communicating with the outside of the liquid container is formed between the outer peripheral surface of the shell and the inner peripheral surface of the liquid container. The liquid exists in the path from the interior space of the shell through the opening on the other side to the outside. By inserting the open end on the other side into the liquid container, the gap is formed throughout the entire circumference between the outer circumferential surface of the shell and the inner circumferential surface of the liquid container.

2. The loudspeaker device according to claim 1, wherein, The housing has a cylindrical shape extending in the vertical direction, and the width of the housing in the horizontal direction in a cross-sectional view is smaller than the width of the liquid container in the horizontal direction in a cross-sectional view.

3. The loudspeaker device according to claim 1, wherein, The shell and the liquid container are separable.

4. The loudspeaker device according to claim 1, wherein, The open end on the other side is immersed in the liquid. The liquid is exposed to outside air through the gap.

5. The loudspeaker device according to claim 4, wherein, The liquid is non-volatile.

6. The loudspeaker device according to claim 4, wherein, A breathable filter element is provided in the gap.

7. The loudspeaker device of claim 4, wherein the liquid container includes a switching valve for controlling the discharge of the liquid.

8. The loudspeaker device according to claim 1, wherein, The housing includes a first housing with an opening on one side and a second housing with an opening on the other side. The first housing and the second housing are detachably connected to each other.

9. The loudspeaker device according to claim 1, wherein, The liquid is sealed in a flexible bag. The opening on the other side is closed by being placed on the bag body.

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