CN204559875U - A loudspeaker structure - Google Patents

Abstract

The utility model relates to a kind of loadspeaker structure, comprising: vibration component (31), magnetic circuit system (32) and shell (1).Described shell (1), for carrying described vibration component (31) and magnetic circuit system (32), has the back cavity relative with the back side of described vibration component (31) in described shell (1).Especially, described shell (1) has the type that the extends out leak holes (21) and adduction type leak holes (22) that are communicated with space outerpace by described back cavity, described in extend out the quantity of type leak holes (21) and adduction type leak holes (22) equal.A technical problem to be solved in the utility model is the turnover of the smooth air made in loud speaker back cavity, thus the loud speaker tonequality preventing vibration component both sides air pressure imbalance from causing declines.

Description

A loudspeaker structure

technical field

The utility model belongs to the technical field of acoustic-electric transduction, more specifically, the utility model relates to the design and structural features of a micro-speaker.

Background technique

Micro speakers are an indispensable device in modern electronic equipment. With the continuous development of portable electronic equipment such as mobile phones and tablet computers, people have higher requirements for the sound effects of these electronic equipment. In order to meet the needs of consumers, those skilled in the art continue to improve the structural features of micro-speaker modules and micro-speaker monomers to obtain speaker devices with smaller volume and better sound quality.

Improving the rated operating voltage of the loudspeaker is one of the research focuses of those skilled in the art. However, the higher the operating voltage of the speaker, the more heat it will generate during operation. Since the diaphragm of the speaker basically seals the interior of the speaker, when the temperature inside the speaker rises and the air pressure rises, the diaphragm is affected by the air pressure and cannot freely vibrate symmetrically.

As shown in Figure 1, in order to balance the air pressure inside and outside the speaker and maintain the symmetry of the amplitude, those skilled in the art usually open a leakage hole 01 on the speaker shell opposite to the back of the diaphragm, so that the air inside the speaker can communicate with the outside. In some cases, in order to make the air out of the leakage hole more smooth, the structure of the leakage hole 01 will be designed as a hole structure with a wide inside and a narrow outside or a narrow inside and a wide outside, as shown in Figure 2. The symmetry of the membrane amplitude is affected, resulting in the phenomenon of sound distortion. Taking the leak hole with a wide inside and a narrow outside as an example, it is easier for the airflow to flow from the inside to the outside than from the outside to the inside, which causes the air resistance of the diaphragm to be different during the vibration process, the symmetry of the amplitude is affected, and the vibration of the diaphragm is destroyed. The initial balance position makes speaker distortion louder.

Therefore, it is necessary to design a new type of leakage hole, which can make the air on the back of the diaphragm smoothly enter or flow out of the speaker without affecting the balanced vibration of the diaphragm.

Utility model content

One purpose of the utility model is to provide a loudspeaker structure that can allow air to flow in and out of the rear cavity smoothly, and balance the air pressure at the front and back of the diaphragm.

According to one aspect of the present utility model, a loudspeaker structure is provided, including:

vibration components;

magnetic circuit system;

A casing for carrying the vibrating assembly and the magnetic circuit system, the casing has a rear cavity opposite to the back of the vibrating assembly;

The housing has an outwardly expanding leakage hole and an inwardly retracting leakage hole connecting the rear cavity with the external space, and the outwardly expanding type leakage hole and the retracting type leakage hole communicate with each other.

Preferably, the housing may have an outwardly expanding leak hole and an inwardly retracting leak hole, and the outwardly expanding leak hole and the inwardly retracting leak hole are arranged side by side on the rear cavity.

Alternatively, the housing may have an outwardly expanding leak hole and an inwardly retracting leak hole, and the outwardly expanding leak hole and the retracting leak hole are respectively arranged at different positions of the rear chamber.

The shell may also have a plurality of outwardly expanding leakage holes and retracting type leakage holes.

The diameter of the inner opening of the expanding leak hole is smaller than the diameter of the outer opening, and the diameter of the inner opening of the retracting leak hole is larger than the diameter of the outer opening. The outward expansion type leakage hole and the inward type leakage hole may have a stepped structure, or the outward expansion type leakage hole and the inward type leakage hole may have a tapered structure.

Preferably, the outward expansion leakage hole and the retraction leakage hole have a tapered structure, the inner diameter of the outward expansion leakage hole is smaller than the outer diameter, and the inner diameter of the retraction leakage hole is larger than the outer diameter. mouth aperture.

Alternatively, the outward expansion leakage hole and the retraction leakage hole have a stepped structure, the inner diameter of the outward expansion leakage hole is smaller than the outer diameter, and the inner diameter of the retraction leakage hole is larger than the outer diameter. aperture.

In addition, a damping sheet may be attached to the inner or outer opening of the outwardly expanding leakage hole, and similarly, a damping sheet may also be attached to the inner or outer opening of the retracting type leakage hole.

Specifically, the housing may include a first housing and a second housing, the first housing may include a speaker slot for accommodating the vibrating assembly and the magnetic circuit system, the second housing is mounted on the first housing Above, the second shell and the first shell form the rear cavity. The outward-expanding leakage hole and the retraction-type leakage hole may be disposed on the first shell and/or the second shell.

The vibrating assembly may include a diaphragm and a voice coil, the diaphragm is mounted on the housing, and the back of the diaphragm is opposite to the rear cavity.

The speaker device may further include a shrapnel for transmitting sound signals, and the shrapnel is installed on the housing and connected with the vibrating component.

A technical effect of the utility model is that the retracted leakage hole and the outwardly expanded leakage hole can make the air in the rear cavity smoothly enter and exit, and the gas expansion caused by the temperature rise inside the housing will not affect the vibration state of the diaphragm. influence, so as to avoid loudspeaker distortion.

Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a structural schematic diagram of a loudspeaker housing and a leakage hole in the prior art;

Fig. 2 is a side sectional view of a leakage hole in the prior art;

Fig. 3 is a bottom view of the shell described in the specific embodiment of the utility model;

Fig. 4 is an enlarged view of the outwardly expanding leakage hole and the retracting type leakage hole described in the specific embodiment of the present invention;

Fig. 5 is a side sectional view of the housing described in a specific embodiment of the present invention;

Fig. 6 is a side cross-sectional view of the outwardly expanding leakage hole and the retracting type leakage hole in the specific embodiment of the present invention;

Fig. 7 is an exploded view of parts of the loudspeaker structure in the specific embodiment of the present invention.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature, and in no way serves as any limitation of the invention and its application or use.

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The utility model provides a loudspeaker structure, which comprises a vibrating assembly, a magnetic circuit system and a casing. The shell is used to carry the vibrating component and the magnetic circuit system, and the shell has a rear cavity opposite to the back of the vibrating component. When the vibrating component is installed in the housing, the rear cavity forms a substantially enclosed space together with the vibrating component at the back of the vibrating component. Specifically, the vibrating component may include a vibrating membrane, and the vibrating membrane is installed on the housing. The vibrating membrane basically seals the space inside the housing opposite to its back, and the space opposite to the back of the vibrating membrane is the rear cavity. In particular, on the housing that constitutes the rear chamber, there are provided an outwardly expanding leakage hole and an inward type leakage hole that communicate the rear chamber with the external space, and the outwardly expanding type leakage hole and the inward type leakage hole The utility model does not limit the number of leakage holes on the rear cavity.

In a specific embodiment, as shown in Figures 3 and 4, the housing 1 may have an outwardly expanding leak hole 21 and an inwardly retracting leak hole 22, and the outwardly expanding leak hole 21 and the retracting Type leakage holes 22 are arranged side by side on the casing 1 constituting the rear chamber. The rear cavity communicates with the external space through a pair of outwardly expanding leak holes 21 and inwardly retracting leak holes 22 . When the diaphragm vibrates and compresses the space of the rear cavity, the air in the rear cavity can be smoothly discharged from the outward expansion leakage hole 21, and when the diaphragm expands the space of the rear cavity, the The rear cavity can smoothly inhale the air in the external space from the retracted leakage hole 22 . When the outward-expanding leakage hole 21 and the retraction-type leakage hole 22 are arranged side by side, the air exchange between the rear cavity and the external space is carried out at a relatively concentrated position, and those skilled in the art can According to the characteristics and the distribution characteristics of the vibrating components, it is selected whether to set a pair of outwardly expanding leakage holes 21 and retracting type leakage holes 22 together so that the operation of the vibrating components will not be affected by the internal and external air pressure.

In other embodiments, the housing 1 is the same as the above-mentioned embodiment, having an outward expansion type leakage hole 21 and an inward type leakage hole 22, but the two leakage holes can be arranged at different positions of the rear cavity, for example, respectively Set on both sides of the rear cavity. According to possible special working characteristics of the loudspeaker, for example, the diaphragm may not be parallel to the ground when working, but perpendicular to the ground. Due to the influence of gravity and the structural characteristics of the diaphragm itself, the vibration of the diaphragm may produce a certain inclination. Those skilled in the art can set the inward leaking hole 22 and the outward expansion leaking hole 21 at positions away from the ground and close to the ground respectively, and adjust the attitude of the diaphragm through the effect of air pressure.

In particular, when considering the working condition of the vibrating assembly and the structural features of the rear cavity, the casing 1 may also have a plurality of outward-expanding leakage holes 21 and retraction-type leakage holes 22 . The outwardly expanding leakage holes 21 and the retracting type leakage holes 22 may be arranged in a line and spaced apart from each other on the housing 1 of the rear chamber. Or they can also be interspersed and arranged in a rectangular array to be evenly distributed on the casing 1 of the rear chamber. For example, when the rear chamber has a relatively large space and faces the back of the vibrating assembly, if there are only a pair of outwardly expanding leakage holes 21 and retracting type leakage holes 22 centrally arranged on the shell 1 of the rear chamber, then due to The air inlet and outlet positions are too concentrated, which may cause uneven air pressure distribution in the rear cavity. The vibration of the vibrating assembly is still affected by air pressure. In this case, those skilled in the art can arrange a plurality of evenly distributed outward expansion leakage holes 21 and retraction leakage holes 22 on the rear chamber, so that the air can be evenly exchanged between the rear chamber and the external space, To achieve the effect of balanced air pressure.

Preferably, the leakage hole may have a tapered structure or a stepped structure, and Figs. 5 and 6 show the structural features of the tapered leakage hole. The internal structure of the tapered leakage hole is conical tube-shaped, and the diameter of the opening of the external expansion type leakage hole located on the inside of the shell 1 is smaller than the aperture of the opening located on the outside of the shell 1; The aperture of the inner opening is larger than the aperture of the opening located on the outer side of the housing 1 .

In other embodiments, the leakage hole may also have a stepped structure, and the opening diameters at both ends of the leakage hole are different, and the diameter of the leakage hole expands or shrinks through the internal steps. The diameter of the inner opening of the expanding leakage hole 21 is smaller than that of the outer opening; the diameter of the inner opening of the retracting leakage hole 22 is larger than the diameter of the outer opening.

In addition, as shown in FIG. 7 , a damping sheet 4 can be mounted on the leakage hole to provide buffer for air in and out and absorb vibration in the air. On the other hand, the damping sheet 4 can also prevent foreign matter from entering the inside of the speaker from the leakage hole. The damping sheet 4 can be mounted on the inner or outer openings of the outwardly expanding leakage hole 21 and the retracting type leakage hole 22. The utility model does not restrict the damping sheet 4 to be mounted on the inside or outside of the shell 1. This invention Those skilled in the art can select the mounting position of the damping sheet 4 according to the actual situation.

In the loudspeaker structure of the present invention, as shown in FIG. 7, the housing 1 may include a first housing 11 and a second housing 12, and the first housing 11 may include a And the speaker groove 111 of the magnetic circuit system 32, the vibration assembly 31 may also include a voice coil. The diaphragm is installed in the speaker groove 111, and the speaker groove 111 on both sides of itself and the shell 1 are divided into two parts. The magnetic circuit system 32 is installed in the speaker groove 111 on the back of the diaphragm. The voice coil is installed on the back of the diaphragm, and the voice coil is suspended in the magnetic circuit system 32 through the diaphragm. The second housing 12 is installed on the first housing 11 from the direction of the back of the diaphragm, and seals the back of the first housing 11 . The second shell 12 forms the rear chamber with the first shell 11 . The outwardly expanding leakage hole 21 and the retracting type leakage hole 22 communicate the rear cavity with the external space. The utility model does not limit that the leakage hole must be arranged on the first shell 11 or the second shell 12, and those skilled in the art can set the outward expansion type leakage hole 21 and the retraction type leakage hole 22 on the second shell according to the actual situation. on the first housing 11 and/or the second housing 12 .

Furthermore, as shown in FIG. 7 , the loudspeaker structure of the present invention may also include a shrapnel 5 for transmitting sound signals, and the shrapnel 5 is installed on the housing 1 and is electrically connected to the vibrating assembly 31 . Connected, the sound signal can be transmitted from the external device to the vibrating component 31.

The magnetic circuit system 32 may include a central magnet, side magnets and magnetic conductive plates. The central magnet can be arranged on the magnetic conductive plate, the side magnets are located around the central magnet and also arranged on the magnetic conductive plate, and there is a magnetic gap between the side magnets and the central magnet. The magnetic guide plate can be fixedly installed in the speaker groove 111, the voice coil is suspended in the magnetic gap, and the voice coil with the sound signal can vibrate in the magnetic gap, thereby driving the diaphragm to emit sound .

Although some specific embodiments of the present utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present utility model. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A loudspeaker structure, characterized in that, comprising: Vibration assembly (31); magnetic circuit system (32); A casing (1) for carrying the vibration assembly (31) and a magnetic circuit system (32), the casing (1) having a rear cavity opposite to the back of the vibration assembly (31); The shell (1) has an outwardly expanding type leakage hole (21) and an inward type leakage hole (22) connecting the rear cavity with the external space, and the outwardly expanding type leakage hole (21) and the inward type leakage hole (22) The leakage holes (22) communicate with each other. 2. The loudspeaker structure according to claim 1, characterized in that, the housing (1) has an outwardly expanding leak hole (21) and an inwardly retracting leak hole (22), and the outwardly expanding leak hole (21) and the retractable leakage hole (22) are arranged side by side on the rear cavity. 3. The loudspeaker structure according to claim 1, characterized in that, the housing (1) has an outwardly expanding leak hole (21) and an inwardly retracting leak hole (22), and the outwardly expanding leak hole (21) and retractable leakage holes (22) are respectively arranged in different positions of the rear cavity. 4. The loudspeaker structure according to claim 1, characterized in that, the housing (1) has a plurality of outwardly expanding leakage holes (21) and retracting type leakage holes (22). 5. The loudspeaker structure according to claim 1, characterized in that, the inner diameter of the outwardly expanding leak hole (21) is smaller than the outer diameter, and the inner diameter of the retractable leak hole (22) is larger than Outer aperture. 6. The loudspeaker structure according to claim 1, characterized in that: The outwardly expanding leakage hole (21) and the retracting type leakage hole (22) have a tapered structure; or The outward expansion type leakage hole (21) and the retraction type leakage hole (22) have a stepped structure. 7. The loudspeaker structure according to any one of claims 1-6, characterized in that: A damping sheet (4) is pasted on the inner or outer opening of the outward expansion leakage hole (21); A damping sheet (4) is pasted on the inner opening or the outer opening of the retracting leakage hole (22). 8. The loudspeaker structure according to claim 1, characterized in that, the housing (1) comprises a first housing (11) and a second housing (12), and the first housing (11) includes a housing for accommodating the The speaker groove (111) of the vibration assembly (31) and the magnetic circuit system (32), the second shell (12) is installed on the first shell (11), and the second shell (12) is connected with the first shell A housing (11) constitutes the rear chamber; The outward expansion type leakage hole (21) and the retraction type leakage hole (22) are arranged on the first casing (11) and/or the second casing (12). 9. The loudspeaker structure according to claim 1, characterized in that, the vibrating assembly (31) comprises a diaphragm and a voice coil, the diaphragm is installed on the housing (1), and the back of the diaphragm is in contact with the The posterior cavity is opposite. 10. The loudspeaker structure according to claim 1, characterized in that, the loudspeaker device comprises a shrapnel (5) for transmitting sound signals, and the shrapnel (5) is installed on the casing (1) to be connected with the The vibration assembly (31) is connected.