KR20200054139A - Speaker Unit - Google Patents

Abstract

The present invention relates to a speaker unit. The objective of the present invention is to provide a technique for appropriately controlling a distortion phenomenon of sound signal reproduction by reducing a variation in impedance. A damping member is provided between an armature and a coil to reduce sudden variations of unintended impedance in a specific high-frequency band, thereby relatively flattening an impedance peak of a high-frequency band and thus appropriately controlling the distortion phenomenon of sound signal reproduction, such that clean and fresh sound can be reproduced in a high-frequency band. When the speaker unit receives an external impact, the damping member can absorb the impact, thereby preventing deformation of the armature.

Description

Speaker Unit {Speaker Unit}

The present invention relates to a speaker unit.

In recent years, as information and communication technologies and electronic devices have developed, video calls and voice calls are possible, and the use of mobile communication terminals such as smartphones including audio functions and camera functions has become common. Accordingly, technologies related to speakers used in various earphone devices have been developed.

These speakers can be broadly classified into dynamic and armature speakers. The dynamic type speaker (dynamic speaker) is also called a moving coil type and basically consists of a permanent magnet, a central coil, and a vibration plate that vibrates according to the movement of the central coil. When an electric current flows through the central coil, the central coil moves by interaction with the magnetic field formed by the permanent magnet. At this time, as the central coil moves, the vibration plate vibrates to generate sound.

However, dynamic speakers have limitations in miniaturization. Recently, attempts have been made to apply balanced armature (BA) speakers, which are convenient for miniaturization, as kernel-type earphone speakers. The balanced armature speaker generates sound by vibrating the diaphragm through the vibration of the armature, which is a medium that converts electrical energy into kinetic energy.

The balanced armature speaker has a high resolution of reproduction sound, so it can reproduce clear and delicate sound, and the amateur's transient response is good, so the reproduction sound is delicate. Especially, it is easy to reproduce high-quality sound in the mid / high range. have. However, there was a problem in that it was difficult to control the pressure inside the case (housing) generated by the vibration of the diaphragm.

In this regard, Korean Patent Registration No. 10-1821579 (hereinafter referred to as 'prior art') has been known. The prior art proposed an amateur speaker unit including a damper to adjust the pressure inside the case.

Recently, even in small earphones, products with balanced armature speaker units have been diversified according to consumption trends that require delicate sound reproduction at high frequencies. However, the balanced armature speaker unit realizes a characteristic expressed as a sharp peak in a narrow band as it goes beyond a certain high-pitched tone band, and due to the phenomenon that the variability of unit impedance due to the resonance of the armature is strong, distortion of sound signal reproduction occurs. It was necessary to provide a smoother and more stable sound quality due to the problem of making a very hard and sharp sound.

The present invention is to solve the above-described problem, and provides a technique for appropriately controlling distortion of acoustic signal reproduction by reducing impedance variability.

Speaker unit according to the present invention for achieving the above object is a solenoid coil that generates a magnetic field by receiving an acoustic signal; A substrate electrically connected to the solenoid coil to apply an acoustic signal; A magnet that forms a fixed magnetic field that interferes with the magnetic field generated by the solenoid coil; An armature vibrating due to an interaction between the magnetic field of the solenoid coil and the fixed magnetic field of the magnet; A vibration plate on one side of which is combined with the armature and vibrates in conjunction with the vibration of the armature; The solenoid coil, a casing in which the magnet and the armature are accommodated; and the armature includes a vibration part penetrating the inner side of the solenoid coil and being spaced apart between the magnets and vibrating due to the vibration of the armature; And a fixing part positioned between the solenoid coil and the diaphragm, one end being bent in a direction in which the fixing part is formed; And a connecting portion formed extending from the other end of the vibrating portion and formed in a vertical direction to connect the vibrating portion and the fixing portion.

The damping member may be characterized in that elastic deformation and restoration are possible.

The damping member may be disposed between the vibrating part and the solenoid coil, one end coupled to the fixing part, and the other end coupled to the inside of the solenoid coil.

The damping member may be disposed between the connection part and the solenoid coil, and one end may be coupled to the connection part and the other end may be coupled to the solenoid coil.

The damping member may be disposed between the fixing part and the solenoid coil, one end coupled to the fixing part, and the other end coupled to the outside of the solenoid coil.

The damping member may be disposed between the vibration unit and the substrate, and one end may be coupled to the vibration unit and the other end may be coupled to the substrate.

The damping member may be disposed between the connection part and the casing, and one end may be coupled to the connection part and the other end may be coupled to the inside of the casing.

The speaker unit according to the present invention is provided with a damping member between the armature and the coil to reduce the sudden fluctuation of the unintended impedance in a specific band of the high frequency band, thereby making the impedance peak of the high frequency band relatively flat and properly distorting the sound signal reproduction. By controlling, it is possible to provide a clean and cool sound reproduction in a high-pitched tone range. In addition, when the speaker unit receives an external shock, it is possible to absorb the shock to prevent deformation such as an amateur.

1 is an exploded perspective view showing components of a speaker unit according to an embodiment of the present invention.
2 is a cross-sectional view of a speaker unit according to an embodiment of the present invention.
3 is a rear view of a speaker unit according to an embodiment of the present invention.
4 is a graph showing an impedance value of sound generated in a speaker unit according to an embodiment of the present invention.

The preferred embodiments of the present invention will be described in more detail, but

Technical parts that are missing will be omitted or compressed for the sake of brevity.

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

<Description of the speaker unit>

The speaker unit 100 according to an embodiment of the present invention will be described with reference to FIG. 1.

The speaker unit 100 according to an embodiment of the present invention includes a solenoid coil 110, a substrate 180, a magnet, an armature 120, a drive rod 130, a diaphragm 160, a casing 170, a damper 190 It includes.

The solenoid coil 110 may receive a sound signal from the outside to generate a magnetic field. As the acoustic signal is variable, the direction or intensity of the magnetic field generated by the solenoid coil 110 may also be variable.

The substrate 180 is configured to apply an acoustic signal to the solenoid coil 110, as shown in FIG. 1, according to the first embodiment of the present invention, electrically connected to the solenoid coil 110 inside the casing and external It is also electrically connected to connect to receive sound signals. The substrate 180 is a printed circuit board (PCB) and may be a flexible PCB (FPCB).

A substrate hole (not shown) for exposing a portion of the substrate 180 to the casing 170 may be formed through. That is, the inside of the casing 170 is formed to be extended to the outside through a substrate hole (not shown) to be exposed to the outside to receive an external acoustic signal.

The magnet 140 is fixed to generate a magnetic field, it may be preferably provided in more than one pair.

As shown in FIGS. 2 to 3, the rest of the armature 120 may be disposed between the magnets 140 while a part of the armature 120 is disposed inside the solenoid coil 110. The armature 120 vibrates according to the interaction between the magnetic field of the solenoid coil 110 and the magnetic field of the magnet 140, and thus the drive rod 130, which will be described later, also vibrates.

The armature 120 according to an embodiment of the present invention specifically includes a vibration part 121, a protrusion part 122, a fixing part 123, and a connection part 124.

The vibration part 121 penetrates the inner side of the solenoid coil 110 and is spaced apart between the magnets 140 and is coupled to one side of the drive rod 130. It is a part that transmits vibration to the drive rod 130 while vibrating according to the acoustic signal.

The fixing part 123 is formed to extend from the other end of the vibration part 121 and is located between the solenoid coil 110 and the vibration plate 160, and one end is formed while being bent in a direction in which the vibration part 121 is formed. A part of the fixing part 123 is fixed to a coil or the like.

The drive rod 130 may be provided integrally with the armature 120 as one side is configured to be vertically coupled to the armature 120.

The core 150 may be provided in a configuration that accommodates the magnet 140.

The diaphragm 160 is attached to the other side of the drive rod 130 and may generate sound while vibrating as the drive rod 130 vibrates. The diaphragm 160 may be preferably provided in the form of a thin film made of a non-magnetic metal material.

The casing 170 is configured to protect each of the above-described components, solenoid coil 110, armature 120, and core 150 are accommodated, and an acoustic hole (not shown) is formed on one side, so that the diaphragm 160 is provided. It plays a role of outputting the generated sound to the outside.

As shown in FIG. 1, the damper 190 is configured to be coupled to a damping hole P formed in a casing to control damping, and the damping hole P has one side of the second casing 170b so that sound can pass therethrough. It is preferably formed on the other side of the casing facing the acoustic hole formed in.

Therefore, the damper 190 can effectively control the internal pressure generated through the vibration of the diaphragm 160 in the casing 170 without additional configuration by the position where the damping hole P is formed.

<Description of the damping member 111 of the present invention>

The damping member 111 of the present invention will be described in more detail with reference to FIGS. 1 to 3.

2 and 3, the damping member 111 for damping is provided with an edge of the vibration part 121 facing the inside of the solenoid coil 110 to bind the solenoid coil 110 and the armature 120. It may be provided on the side of the solenoid coil 110.

However, as shown in FIGS. 5 to 8, the damping member 111 may be bound to a configuration adjacent to the armature 120 while the other end is bound to the armature 120. For example, as shown in Figure 2, the damping member 111 is disposed between the vibration unit 121 and the solenoid coil 110, one side can be coupled to the other side of the vibration unit 121 of the armature 120, , As shown in FIG. 5, disposed between the connecting portion 124 and the solenoid coil 110, one side is coupled to the connecting portion 124 and the other end can be coupled to the solenoid coil 110.

In addition, as shown in Figure 6 is disposed between the fixing portion 123 and the solenoid coil 110, one end is coupled to the fixing portion 123 and the other end can be coupled to the outside of the solenoid coil. As shown in FIG. 7, the damping member 111 is disposed between the vibration unit 121 and the substrate 180, one end of which is coupled to the vibration unit 121 and the other end of the damping member 111 may be coupled to the substrate 180. And, as shown in Figure 8, the damping member 111 is disposed between the connecting portion 123 and the casing 170, one end is coupled to the connecting portion 123 and the other end can be coupled to the inside of the casing.

In addition to the above-described example, the damping member 111 may be coupled to one end of the armature and the other end to be configured to adjust the vibration of the armature, and may be provided in at least one of the positions described above.

In general, in reproducing the sound provided by a speaker, an impedance value is a factor that determines sound quality in a corresponding sound band. As the impedance value is kept constant in all audible ranges, the sound characteristics are stable, so that a comfortable hearing can be provided to the user.

However, in the balanced armature speaker unit, the impedance may suddenly rise and fall in a narrow range corresponding to a resonance frequency band of approximately 6K to 7K Hertz, which may provide a sharp and distorted sound to the user.

The Q (Quality factor) value of the impedance indicates how much the speaker unit's suspension system can withstand the resonance frequency inside the speaker, and the lower the value, the better the suspension system's ability to brake resonance. . The damping factor is a numerical value related to the ability to brake this Q value, and the higher the damping factor, the better the braking force as a suspension.

For example, looking at the graph of FIG. 4, in the absence of the damping member 111, there was a large variation in width due to the rapid rise and fall of the impedance at about 2.5K hertz and about 6K hertz. It can be confirmed that such fluctuations were alleviated when existed. That is, the damping member 111 increases the damping factor to lower the rapid variability of the impedance as described above, thereby lowering the Q value, thereby reducing sound distortion and providing a soft sound to the user.

Specifically, as described above, the damping member 111 may be provided between the armature 120 and the solenoid coil 110, which is a damping member between both components to connect the armature 120 and the solenoid coil 110 ( It may mean that 111) is filled.

The damping member 111 according to an embodiment of the present invention is preferably made of a material capable of elastic deformation and restoration. As a result, the ability to brake a sudden change in the vibration width of an amateur on a specific resonance frequency in a high-frequency band is further improved. That is, when the armature or the solenoid coil or the like has a rapidly changing movement, the damping member 111 made of the above material can hold the upper movement by the elastic force of the damping member 111. In the damping factor, which can lower the fluctuation of the impedance, the excellent suspension role can be further improved.

In addition, since the damping member 111 according to an embodiment of the present invention has elastic force, the above-described braking ability can be exerted in the low-end range where the drop of vibration width change, such as an armature, to which the damping member 111 is deformed is not large. Since the damping member 111 does not significantly affect the normal movement of an amateur or the like, it is possible to prevent unintended separate sound quality distortion.

In addition, the damping member 111 according to an embodiment of the present invention absorbs the shock of an amateur 120, etc., which can be applied when the product to which the present invention speaker unit is applied receives an external shock, thereby preventing additional deformation. It can also serve as a shock absorbing member.

As described above, although the detailed description of the present invention has been made by examples, it is understood that the present invention is limited only to the above-described embodiments, since the above-described embodiments are merely described as preferred examples of the present invention. It should be understood that the scope of the present invention is to be understood by the following claims and equivalent concepts.

100: speaker unit
110: solenoid coil
111: damping member
120: amateur
121: vibrating unit
122: protrusion
123: fixing part
124: connection
130: drive load
140: magnet
150: core
160: diaphragm
170: casing
170a: first casing
T: Open hole
P: Damping hole
170b: second casing
180: substrate
190: damper

Claims (6)

A solenoid coil that generates an magnetic field by receiving an acoustic signal;
A substrate electrically connected to the solenoid coil to apply an acoustic signal;
A magnet that forms a fixed magnetic field that interferes with the magnetic field generated by the solenoid coil;
An armature vibrating due to an interaction between the magnetic field of the solenoid coil and the fixed magnetic field of the magnet;
A vibration plate on one side of which is combined with the armature and vibrates in conjunction with the vibration of the armature;
A casing in which the solenoid coil, magnet and armature are stored; And
A shock absorbing member that binds the armature to any one of the solenoid coil, the substrate, and the casing, and is provided with a material that is elastically deformable and restorable to absorb the shock of the armature and prevent deformation when subjected to external shock ; Containing
Speaker unit. According to claim 1,
A damper for adjusting the internal pressure generated through vibration of the diaphragm in the casing; Containing more
Speaker unit. According to claim 1,
The amateur,
A vibration unit penetrating the inner side of the solenoid coil and being spaced apart between the magnets and vibrating by the vibration of the armature;
A fixing part located between the solenoid coil and the diaphragm; And
It is formed extending from one end of the vibration portion connected to the vibration portion and the fixing portion formed in a vertical direction; includes,
The shock absorbing member is disposed between the vibrating part and the solenoid coil, and one end is coupled to the vibrating part and the other end is coupled inside the solenoid coil.
Speaker unit. According to claim 1,
The amateur,
A vibration unit penetrating the inner side of the solenoid coil and being spaced apart between the magnets and vibrating by the vibration of the armature; And
A fixing part located between the solenoid coil and the diaphragm; And
It is formed extending from one end of the vibration portion connected to the vibration portion and the fixing portion formed in a vertical direction; includes,
The vibration absorbing member
It is disposed between the fixing part and the solenoid coil, characterized in that one end is coupled to the fixing part and the other end is coupled to the outside of the solenoid coil.
Speaker unit. According to claim 1,
The amateur,
A vibration unit penetrating the inner side of the solenoid coil and being spaced apart between the magnets and vibrating by the vibration of the armature;
A fixing part located between the solenoid coil and the diaphragm; And
It is formed extending from one end of the vibration portion connected to the vibration portion and the fixing portion formed in a vertical direction; includes,
The vibration absorbing member is disposed between the vibrating part and the substrate, one end being coupled to the vibrating part and the other end being coupled to the substrate.
Speaker unit. According to claim 1,
The amateur,
A vibration unit penetrating the inner side of the solenoid coil and being spaced apart between the magnets and vibrating by the vibration of the armature;
A fixing part located between the solenoid coil and the diaphragm; And
It is formed extending from one end of the vibration portion connected to the vibration portion and the fixing portion formed in a vertical direction; includes,
The vibration absorbing member is disposed between the connecting portion and the casing, characterized in that one end is coupled to the connecting portion and the other end is coupled to the inside of the casing.
Speaker unit.

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