Speakers and electronic equipment

Abstract

The present invention provides a speaker and electronic device that make it difficult for the diaphragm to come into contact with other structures. [Solution] The speaker includes a diaphragm 210 on which a first wiring pattern and a second wiring pattern are formed, and which vibrates in response to an electromagnetic force in a first direction generated when a first signal flows through the first wiring pattern, and magnets 242 and 244. At least a portion of the second wiring pattern is positioned in the magnetic field in the first direction formed by the magnets 242 and 244. When a second signal flows through the second wiring pattern, the diaphragm 210 receives an electromagnetic force outward from the diaphragm, which is an electromagnetic force in a second direction perpendicular to the first direction, generated by the second signal and the magnets 242 and 244.

Description

Technical Field

[0001] This disclosure relates to speakers and electronic devices.

Background Art

[0002] A planar speaker that emits sound by vibrating a diaphragm is known. For example, the planar speaker described in Patent Document 1 emits sound by vibrating the diaphragm back and forth by the electromagnetic force in the direction of the diaphragm surface generated when an electric current is applied to a coil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, if the diaphragm is distorted due to deflection caused by its own weight or aging, the clearance between the diaphragm and other structures (such as magnets and housings) may become narrow. In this case, when the diaphragm is vibrated, the diaphragm is likely to contact other structures and generate abnormal sounds.

[0005] In view of the above circumstances, an embodiment of this disclosure aims to provide a speaker and an electronic device that make it difficult for a diaphragm to contact other structures.

Means for Solving the Problems

[0006] A speaker according to one embodiment of the present disclosure includes a diaphragm on which a first wiring pattern and a second wiring pattern are formed, the diaphragm vibrates in response to an electromagnetic force in a first direction generated when a first signal flows through the first wiring pattern, and at least one magnet. At least a portion of the second wiring pattern is positioned in a magnetic field in a first direction formed by the magnet. When a second signal flows through the second wiring pattern, the diaphragm receives an electromagnetic force in a second direction perpendicular to the first direction, generated by the second signal and the magnet, which is an electromagnetic force directed outward from the diaphragm. [Effects of the Invention]

[0007] According to one embodiment of the present disclosure, a speaker and electronic equipment are provided that make it difficult for the diaphragm to come into contact with other structures. [Brief explanation of the drawing]

[0008] [Figure 1] This is a block diagram showing a speaker system (electronic device) according to one embodiment of the present disclosure. [Figure 2] This is an exploded perspective view showing the schematic configuration of a speaker according to one embodiment of the present disclosure. [Figure 3] This is a cross-sectional view showing the schematic configuration of a speaker according to one embodiment of the present disclosure. [Figure 4] This figure shows the tension acting on the diaphragm in one embodiment of the present disclosure. [Figure 5] This is a cross-sectional view showing the schematic configuration of a speaker according to one embodiment of the present disclosure. [Figure 6] This figure shows the signal supplied to the diaphragm in one embodiment of the present disclosure. [Figure 7] This figure shows the tension acting on the diaphragm in another embodiment of the present disclosure. [Modes for carrying out the invention]

[0009] The following description relates to a speaker and speaker system (electronic device) according to one embodiment of the present disclosure. Common or corresponding elements are denoted by the same or similar reference numerals, and redundant descriptions are omitted or simplified as appropriate. In each figure, the configuration may be enlarged, reduced, or omitted as appropriate for the sake of explanation. In order to improve the visibility of the drawings, elements in the figures may be shown with lines other than solid lines (such as dashed lines or dotted lines) as necessary.

[0010] In the following explanation, two mutually orthogonal directions are referred to as the x-direction and the y-direction. The direction perpendicular to both the x-direction and the y-direction is referred to as the z-direction. That is, the x, y, and z directions are mutually orthogonal. For convenience, the axes extending in the x, y, and z directions may be referred to as the x-axis, y-axis, and z-axis, respectively. The x-direction may also be called the front-back direction. The y-direction may also be called the left-right direction. The z-direction may also be called the up-down direction. Note that these directional designations are used for convenience to explain the relative positional relationships of the components and do not indicate absolute directions. For example, depending on the orientation of the device, the y-direction may not necessarily be the left-right direction, but may be the front-back direction.

[0011] As shown in Figure 1, speaker system 1 includes a driver 100 and a speaker 200. "Speaker system 1" may be replaced with "electronic device 1". Electronic device 1 includes various forms of devices that incorporate speakers, such as headphones, audio equipment, tablet terminals, and smartphones. Driver 100 is an example of a circuit connected to speaker 200 and is a speaker driver for operating speaker 200. Driver 100 includes a drive signal conversion circuit 102, a D / A converter 104, an amplifier 106, and a drive signal conversion circuit 108.

[0012] The drive signal conversion circuit 102 converts the audio signal Sa input from a sound source (not shown) into a digital drive signal suitable for the speaker 200. The converted drive signal is then converted to an analog signal by the D / A converter 104 and amplified by the amplifier 106. The amplified audio signal S1 (an example of the first signal) is output to the speaker 200. As a result, sound corresponding to the audio signal S1 is emitted from the speaker 200. For convenience, in Figure 1, the audio signal S1 is shown as a simple sine wave.

[0013] Furthermore, any reference to elements using designations such as “First,” “Second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations are used for convenience to distinguish between two or more elements. Therefore, references to the First and Second elements do not imply, for example, that only two elements are adopted, or that the First element must precede the Second element.

[0014] The signal Sb generated by a signal generator (not shown) is input to the drive signal conversion circuit 108. The drive signal conversion circuit 108 converts the signal Sb input from the signal generator into an auxiliary signal S2 (an example of a second signal) and outputs it to the speaker 200. As a result, tension acts on the diaphragm 210 inside the speaker 200, as will be described in more detail later. Even in cases where the diaphragm 210 bends due to its own weight, deforms when subjected to load, or distorts in the shape of the diaphragm 210 due to aging, the tension acts on the diaphragm 210, keeping it taut and stretched flat. Therefore, clearance can be ensured between the diaphragm 210 and other structures. This prevents accidental contact between the diaphragm 210 and other structures when the diaphragm 210 is vibrated.

[0015] Speaker 200 is an example of a planar speaker. As shown in Figure 2, speaker 200 includes a diaphragm 210, magnets 222, 224, housing 230, magnets 242, 244, and yokes 252, 254. Housing 230 includes an upper case 232 and a lower case 234. For example, the upper case 232 has a fitting claw and the lower case 234 has a fitting groove. The upper case 232 and the lower case 234 are fitted together by the fitting claw and the fitting groove. The various parts of speaker 200 (diaphragm 210, magnets 222, 224, 242, 244, yokes 252, 254) are installed in the space defined by the upper case 232 and the lower case 234.

[0016] The diaphragm 210 is, for example, an FPC (Flexible Printed Circuits). As shown in Figure 4, a bellows-shaped voice coil pattern P1 (an example of a first wiring pattern) is formed on the diaphragm 210. The voice coil pattern P1 is electrically connected to the driver 100, for example, via lead wires soldered to its ends (lands). The audio signal S1 supplied from the driver 100 flows through the voice coil pattern P1.

[0017] Magnets 222 and 224 are sheet-shaped magnets with alternating north and south poles magnetized in a striped pattern, as shown in the partially enlarged view of Figure 3. Magnet 222 is fixed to the inner wall surface of the upper case 232 by screws or the like, and is positioned above the diaphragm 210 and parallel to the diaphragm 210. Magnet 224 is fixed to the inner wall surface of the lower case 234 by screws or the like, and is positioned below the diaphragm 210 and parallel to the diaphragm 210. In this way, magnets 222 and 224 are positioned opposite each other with the diaphragm 210 in between.

[0018] The voice coil pattern P1 is arranged in the left - right magnetic field formed by the magnets 222 and 224 (that is, the magnetic field along the plate surface direction of the diaphragm 210). Therefore, when the audio signal S1 flows through the voice coil pattern P1, according to Fleming's left - hand rule, an electromagnetic force in the plate thickness direction (an example of the first direction, for example, the z - direction) acts on the diaphragm 210. That is, when the audio signal S1 (an example of the first signal) flows through the voice coil pattern P1 (an example of the first wiring pattern), the diaphragm 210 receives the electromagnetic force in the plate thickness direction generated at this time, vibrates at an amplitude and frequency corresponding to the audio signal S1, and emits a sound corresponding to the audio signal S1.

[0019] As shown in FIG. 4, a pair of through - holes 212 are formed in the diaphragm 210. Also, as shown in FIG. 5, a pair of receiving seats 236 are formed in the lower case 234. Each receiving seat 236 has a threaded hole formed at a position corresponding to each through - hole 212. By passing a screw 238 through each through - hole 212 and fastening it to the threaded hole, as shown in FIG. 5, the diaphragm 210 is fixed to the housing 230.

[0020] In a state where the diaphragm 210 is taut, the height of the receiving seat 236 is set so that the diaphragm 210 is arranged at the central position in the z - direction between the magnet 222 and the magnet 224. In other words, in a state where the diaphragm 210 is taut, the height of the receiving seat 236 is set so that the clearance in the z - direction between the diaphragm 210 and the magnet 222 is equal to the clearance in the z - direction between the diaphragm 210 and the magnet 224. Since the clearance between the diaphragm 210 and the magnet 222 is ensured, inadvertent contact between the diaphragm 210 and the magnet 222 is avoided. At the same time, since the clearance between the diaphragm 210 and the magnet 224 is also ensured, inadvertent contact between the diaphragm 210 and the magnet 224 is avoided.

[0021] The vibration of the diaphragm 210 is suppressed when it is fixed to the support seat 236. Therefore, in this embodiment, as shown in Figure 4, a slit 214 is formed between the central region of the diaphragm 210 where the voice coil pattern P1 is formed and the peripheral region of the diaphragm 210 where the through hole 212 is formed. Exemplarily, the slit 214 is formed along the second side of the diaphragm 210 (for example, the side along the y direction in Figure 4) where the yokes 252 and 254 are not located. The central region and the peripheral region of the diaphragm 210 are connected only at the sides of the slit 214. Because the central region and the peripheral region of the diaphragm 210 are physically largely separated by the slit 214, the effect of fixing the diaphragm 210 to the support seat 236 on suppressing the vibration of the diaphragm 210 is reduced.

[0022] Figure 5 shows how the diaphragm 210 vibrates when an audio signal S1 is passed through the voice coil pattern P1. In speaker 200, as the bass volume is increased, the vibration amplitude of the diaphragm 210 increases, making it easier for the diaphragm 210 to come into contact with magnets 222 and 224, thus generating abnormal noise. In this embodiment, tension is applied to the diaphragm 210 to prevent such a deterioration in sound quality due to contact, even when the volume is increased.

[0023] Specifically, as shown in Figure 4, an auxiliary pattern P2 (an example of a second wiring pattern) is formed on the diaphragm 210. The auxiliary pattern P2 is formed along at least two opposing sides 210A and 210B of the diaphragm 210. Sides 210A and 210B are examples of the first side. In the example in Figure 4, the auxiliary pattern P2 is formed to surround the voice coil pattern P1. In Figure 4, the reference numeral P21 indicates the portion of the auxiliary pattern P2 formed along one of the two opposing sides (side 210A). The reference numeral P22 indicates the portion of the auxiliary pattern P2 formed along the other of the two opposing sides (side 210B). For convenience, the former is denoted as "pattern portion P21". The latter is denoted as "pattern portion P22".

[0024] The auxiliary pattern P2 is electrically connected to the driver 100, for example, via lead wires soldered to its ends (lands). An auxiliary signal S2 (an example of a second signal) supplied from the drive signal conversion circuit 108 flows through the auxiliary pattern P2. The auxiliary signal S2 (in other words, current I) flows along the auxiliary pattern P2 in a clockwise direction in the plan view of Figure 4. As shown in Figure 4, in pattern section P21, the current I flows in the x-positive direction. In pattern section P22, the current I flows in the x-negative direction.

[0025] As shown in Figure 3, magnet 242 is positioned below the pattern portion P21, which sandwiches the diaphragm 210. Magnet 244 is positioned below the pattern portion P22, which sandwiches the diaphragm 210. Magnet 242 is formed in a rod shape and extends in the x-direction corresponding to the pattern portion 21. Magnet 244 is similarly formed in a rod shape and extends in the x-direction corresponding to the pattern portion 22. In addition, magnets 242 and 244 are positioned along sides 210A and 210B, respectively. Magnets 242 and 244 are examples of a pair of magnets. Magnets 242 and 244 are, for example, ferrite magnets, neodymium magnets, samarium cobalt magnets, or alnico magnets.

[0026] Yokes 252 and 254 are positioned corresponding to magnets 242 and 244, respectively. Yokes 252 and 254 are made of a soft magnetic material. Yoke 252 has a U-shaped yz cross-section and extends in the x-direction corresponding to the pattern portion 21 and magnet 242. Yoke 254 also has a U-shaped yz cross-section and extends in the x-direction corresponding to the pattern portion 22 and magnet 244.

[0027] As shown in Figure 3, the U-shaped yoke 252 covers the top, sides, and bottom of side 210A (an example of the first side) of the diaphragm 210. For convenience, the portion of the yoke 252 that covers the top of side 210A is referred to as "part 252a". The portion of the yoke 252 that covers the bottom of side 210A is referred to as "part 252b". The portion of the yoke 252 that covers the sides of side 210A is referred to as "part 252c". The magnet 242 is fixed to part 252b by adhesive or the like.

[0028] The yoke 252, together with the magnet 242, constitutes a magnetic circuit. In this magnetic circuit, the magnetic flux circulates through a path consisting of the magnet 242 and parts 252b, 252c, and 252a of the yoke 252. That is, as shown in Figure 3, a magnetic flux B flows downward (in the negative z direction) around the pattern portion 21 of the auxiliary pattern P2. In other words, the pattern portion 21 is positioned in a magnetic field in the downward direction (an example in the plate thickness direction, and also an example in the first direction). Furthermore, the yoke 252, together with the magnet 242, constitutes a magnetic circuit that generates a magnetic field in the downward direction (an example in the plate thickness direction).

[0029] When a current I flows forward (positive x direction) through the pattern section 21, which is positioned in a downward (negative z direction) magnetic field, an electromagnetic force F1 acts on the diaphragm 210 in the rightward (positive y direction) direction, according to Fleming's left-hand rule, as shown in Figures 3 and 4.

[0030] As shown in Figure 3, the U-shaped yoke 254 covers the top, sides, and bottom of side 210B (an example of the first side) of the diaphragm 210. For convenience, the portion of the yoke 254 that covers the top of side 210B is referred to as "part 254a". The portion of the yoke 254 that covers the bottom of side 210B is referred to as "part 254b". The portion of the yoke 254 that covers the sides of side 210B is referred to as "part 254c". The magnet 244 is fixed to part 254b by adhesive or the like.

[0031] The yoke 254, together with the magnet 244, constitutes a magnetic circuit. In this magnetic circuit, the magnetic flux circulates through a path consisting of the magnet 244 and parts 254b, 254c, and 254a of the yoke 254. That is, a magnetic flux B flows downward (in the negative z direction) around the pattern portion 22 of the auxiliary pattern P2, as shown in Figure 3. In other words, the pattern portion 22 is positioned in a magnetic field in the downward direction (an example in the plate thickness direction, and also an example in the first direction). Furthermore, the yoke 254, together with the magnet 244, constitutes a magnetic circuit that generates a magnetic field in the downward direction (an example in the plate thickness direction).

[0032] When a current I flows backward (in the negative x direction) through the pattern section 22, which is positioned in a magnetic field downward (in the negative z direction), an electromagnetic force F2 acts on the diaphragm 210 in the leftward (negative y direction) direction, according to Fleming's left-hand rule, as shown in Figures 3 and 4.

[0033] Thus, when the auxiliary signal S2 flows to the auxiliary pattern P2, the diaphragm 210 is pulled to the right (positive y-direction) by the electromagnetic force F1 and simultaneously pulled to the left (negative y-direction) by the electromagnetic force F2. In other words, the diaphragm 210 is subjected to tension pulling it left and right (y-direction). Even in cases where the diaphragm 210 deflects due to its own weight, deforms when subjected to load, or distorts its shape due to aging, the tension acts on the diaphragm 210, causing it to be stretched flat and taut. This state of the diaphragm 210 being stretched flat ensures clearance between the diaphragm 210 and other structures (e.g., magnets 222, 224) across almost its entire surface. Because clearance is ensured between the diaphragm 210 and other structures, for example, when the volume of bass is increased, the diaphragm 210 is less likely to come into contact with other structures unintentionally. Furthermore, by using electromagnetic forces F1 and F2 to apply tension to the diaphragm 210, it becomes unnecessary to attach the diaphragm 210 to the frame or to form corrugations on the diaphragm 210. Therefore, the problem of reduced bass response caused by attaching the diaphragm 210 to the frame can be avoided, and the manufacturing difficulty can be reduced because corrugations are unnecessary.

[0034] Electromagnetic force F1 is an electromagnetic force generated by a second signal (e.g., auxiliary signal S2) and one magnet (e.g., magnet 242) in a direction perpendicular to the plate thickness direction (an example of a second direction), and is an example of a first outward electromagnetic force of the diaphragm 210 (e.g., an electromagnetic force in the positive y direction away from the diaphragm 210). Electromagnetic force F2 is an electromagnetic force generated by a second signal (e.g., auxiliary signal S2) and the other magnet (e.g., magnet 244) in a direction perpendicular to the plate thickness direction (an example of a second direction), and is an example of a second outward electromagnetic force opposite to the first outward force (e.g., an electromagnetic force in the negative y direction away from the diaphragm 210).

[0035] Electromagnetic forces F1 and F2 act in opposite directions but have the same magnitude. However, the magnitudes of electromagnetic forces F1 and F2 are not necessarily the same. As long as the diaphragm 210 can be stretched flat and stably, the magnitudes of electromagnetic forces F1 and F2 may be different.

[0036] The auxiliary signal S2 is a square wave, for example, as shown in Figure 1. When the direction of the current reverses, the directions of the electromagnetic forces F1 and F2 also reverse. In this case, the tension acting on the diaphragm 210 becomes unstable, making it difficult to keep the diaphragm 210 flat. Therefore, the auxiliary signal S2 is always a value greater than or equal to 0 and never a negative value. Furthermore, the current I and magnetic flux B (in other words, electromagnetic forces F1 and F2) are set so that the tension acting on the diaphragm 210 is kept to a minimum. Specifically, the current I and magnetic flux B (for example, the level of the auxiliary signal S2, the materials of magnets 242 and 244, yokes 252 and 254, etc.) are set so that the tension acting on the diaphragm 210 does not hinder the vibration of the diaphragm 210 in response to the audio signal S1.

[0037] The driver 100 may generate an auxiliary signal S2 based on the audio signal S1. For example, as shown in Figure 6, the driver 100 may generate a half-wave rectified wave of the audio signal S1 and output the generated half-wave rectified wave as the auxiliary signal S2. In this case, a signal generator for the auxiliary signal S2 is not required. Because it is a half-wave rectified wave, the sign does not invert to negative, and the directions of the electromagnetic forces F1 and F2 do not reverse. Therefore, tension acts stably on the diaphragm 210 while the auxiliary signal S2 is flowing.

[0038] The driver 100 continues to output the auxiliary signal S2 to the speaker 200 while power is supplied, for example, from a power supply circuit (not shown). Therefore, tension acts on the diaphragm 210 while power is supplied to the driver 100. The driver 100 may also continue to output the auxiliary signal S2 to the speaker 200 only during the period when it is outputting the audio signal S1 to the speaker 200. By limiting the output period of the auxiliary signal S2, the power consumption of the driver 100 can be reduced.

[0039] The above is a description of exemplary embodiments of the present disclosure. Embodiments of the present disclosure are not limited to those described above, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. For example, embodiments of the present application include combinations of embodiments explicitly shown in the specification or obvious embodiments as appropriate.

[0040] In the above embodiment, an electromagnetic force F1 is generated in one of the pair of magnetic circuits, and an electromagnetic force F2 in the opposite direction to the electromagnetic force F1 is generated in the other of the pair of magnetic circuits, thereby acting tension in the left-right direction (y-direction) on the diaphragm 210. In another embodiment of the present disclosure, tension may be acted on the diaphragm 210 in only one direction (for example, positive y-direction, negative y-direction, positive x-direction, negative x-direction).

[0041] Figure 2 illustrates an example configuration that omits the magnetic circuit consisting of magnet 244 and yoke 254. In this case, the speaker 200 is equipped with one magnetic circuit (a magnetic circuit consisting of magnet 242 and yoke 252). Side 210B of the diaphragm 210 is fixed to the housing 230, for example. When the auxiliary signal S2 flows through the auxiliary pattern P2, the diaphragm 210 is pulled to the right (positive y direction) by the electromagnetic force F1. That is, with one end (side 210B) of the diaphragm 210 fixed to the housing 230, the other end (side 210A) is pulled outward (i.e., to the right (positive y direction)). As a result, tension acts on the diaphragm 210, causing it to be stretched flat. Therefore, clearance can be secured between the diaphragm 210 and other structures. This configuration prevents accidental contact between the diaphragm 210 and other structures when the diaphragm 210 is vibrated. Furthermore, in the above embodiment (a configuration in which both sides 210A and 210B are not fixed), since both ends of the diaphragm 210 are not fixed, it is easier to secure a larger vibration amplitude (in other words, good sound quality). That is, in the above embodiment, it is possible to secure a more favorable vibration amplitude while applying tension to the diaphragm 210.

[0042] Thus, the speaker 200 may be configured such that when an auxiliary signal S2 (an example of a second signal) flows through the auxiliary pattern P2 (an example of a second wiring pattern), the speaker 200 receives an electromagnetic force in the thickness direction (an example of a first direction) generated by the auxiliary signal S2 and the magnet 242, which vibrates in response to the electromagnetic force in the thickness direction (an example of a first direction) generated when an audio signal S1 (an example of a first signal) flows through the voice coil pattern P1, and a magnet 242 (an example of at least one magnet), and at least a part of the auxiliary pattern P2 (an example of a second wiring pattern) is placed in the thickness direction magnetic field formed by the magnet 242, and the speaker 200 receives an electromagnetic force (e.g., electromagnetic force F1) outward from the speaker 210, which is an electromagnetic force in a direction perpendicular to the thickness direction (an example of a second direction) generated by the auxiliary signal S2 (an example of a second signal) and the magnet 242.

[0043] In yet another embodiment of this disclosure, tension may be applied to the diaphragm 210 in the front-to-back direction (x direction) in addition to the left-to-right direction (y direction).

[0044] As shown in Figure 7, in another embodiment of the present disclosure, in addition to the pair of magnetic circuits (a magnetic circuit consisting of magnet 242 and yoke 252, and a magnetic circuit consisting of magnet 244 and yoke 254), another pair of magnetic circuits are provided. Specifically, magnetic circuits are installed for each of the other opposing pair of sides 210C and 210D. For side 210C, a magnetic circuit similar to that in the above embodiment, consisting of magnet 246 and yoke 256, is installed. For side 210D, a magnetic circuit similar to that in the above embodiment, consisting of magnet 248 and yoke 258, is installed.

[0045] In the example shown in Figure 7, the auxiliary pattern P2 is formed along each side of the diaphragm 210 so as to surround the voice coil pattern P1. In Figure 7, the reference numeral P23 indicates the portion of the auxiliary pattern P2 formed along side 210C. The reference numeral P24 indicates the portion of the auxiliary pattern P2 formed along side 210D. For convenience, the former is referred to as "pattern portion P23," and the latter as "pattern portion P24." Similar to the embodiment described above, a magnetic flux B flows downward (in the negative z direction) around the pattern portions 23 and 24 by the magnetic circuit.

[0046] When a current I flows to the right (positive y direction) through the pattern section 23 positioned in a downward (negative z direction) magnetic field, an electromagnetic force F3 acts on the diaphragm 210 in the backward (negative x direction) direction according to Fleming's left-hand rule, as shown in Figure 7. When a current I flows to the left (negative y direction) through the pattern section 24 positioned in a downward (negative z direction) magnetic field, an electromagnetic force F4 acts on the diaphragm 210 in the forward (positive x direction) direction according to Fleming's left-hand rule, as shown in Figure 7. Therefore, the diaphragm 210 is subjected to tension pulling it from side to side (y direction) as well as tension pulling it from front to back (x direction). As a result, the diaphragm 210 becomes even more stable and stretched flat. Because clearance is ensured between the diaphragm 210 and other structures, for example, even when the volume of bass is increased, the diaphragm 210 is less likely to come into contact with other structures unintentionally. [Explanation of Symbols]

[0047] 1: Speaker system, 100: Driver, 200: Speaker, 210: Diaphragm, 242, 244: Magnet, P1: Voice coil pattern, P2: Auxiliary pattern

Claims

1. A diaphragm having a first wiring pattern and a second wiring pattern formed on it, the diaphragm vibrates in response to an electromagnetic force in a first direction generated when a first signal flows through the first wiring pattern, Including at least one magnet, At least a portion of the second wiring pattern is positioned in the magnetic field in the first direction formed by the magnet, When the second signal flows through the second wiring pattern, the diaphragm receives an electromagnetic force in a second direction perpendicular to the first direction, generated by the second signal and the magnet, which is an electromagnetic force directed outward from the diaphragm. Speaker.

2. The second wiring pattern is formed along at least one first side of the diaphragm, The magnet is arranged along the first side together with the second wiring pattern. The speaker according to claim 1.

3. The system further comprises a yoke positioned in correspondence with the aforementioned magnet, The yoke, together with the magnet, constitutes a magnetic circuit that generates a magnetic field in the first direction. The speaker according to claim 1.

4. The yoke, together with the second wiring pattern and the magnet, is positioned along at least one first side of the diaphragm and is formed to cover the top, side and bottom of the first side. The speaker according to claim 3.

5. The diaphragm has a slit formed along the second side of the diaphragm where the yoke is not located. The speaker according to claim 4.

6. The second signal is a square wave. The speaker according to claim 1.

7. The first signal is an audio signal, The second signal is a half-wave rectified version of the audio signal. The speaker according to claim 1.

8. The second wiring pattern is formed to surround the first wiring pattern. The speaker according to claim 1.

9. Including a pair of the aforementioned magnets, When the second signal flows through the second wiring pattern, the diaphragm receives an electromagnetic force in a second direction perpendicular to the first direction, generated by the second signal and one of the magnets, which is a first outward electromagnetic force on the diaphragm, and an electromagnetic force in a second direction perpendicular to the first direction, generated by the second signal and the other magnet, which is a second outward electromagnetic force opposite to the first outward force. The speaker according to claim 1.

10. A speaker according to any one of claims 1 to 9, The circuit includes the speaker connected to the speaker, The circuit continues to output the second signal to the speaker during the period in which the first signal is output to the speaker. electronic equipment.

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