Acoustic device

One embodiment of the invention discloses an acoustic device having a housing with a sound hole formed thereon and a speaker unit accommodated in the housing. The speaker unit has a central part, an edge part surrounding the central part and a first strength means formed on the central part for reinforcing rigidity thereof. The first strength means has a first section away from the sound hole and a second section close to the sound hole, and a rigidity of the first section is less than that of the second section.

FIELD OF THE INVENTION

One embodiment of the invention is related to an acoustic device, and more particularly to a speaker box with high audio performance.

DESCRIPTION OF RELATED ART

In modern consumer electronics, audio capability is playing an increasingly larger role as improvements in digital audio signal processing and audio content delivery continue to happen. There is a range of consumer electronics devices that are not dedicated or specialized audio playback devices, yet can benefit from improved audio performance. For instance, smart phones are ubiquitous.

In a typical acoustic device, such as a speaker or a speaker box, a sound radiation surface is provided for generating sound. Generally, the sound radiation surface is a membrane or a diaphragm which is activated by an electrified voice coil. While activated, the sound radiation surface vibrates and produces audible sounds. Recently, the speaker box often defines a sound hole on the sidewall of the speaker box. When operates the speaker box and the voice coil vibrates, a sound resistance in an area close to the sound hole is less than that in an area away from the sound hole. Thus, an unbalance vibration occurred while the voice coil vibrating, which results in a distortion of the sound generated from the speaker box, and some other defaults in the speaker box.

Therefore, an improved acoustic device is provided in the embodiment of the present disclosure to solve the problem mentioned above.

Many aspects of the embodiment can be better understood with reference to the drawings mentioned above. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT

Reference will now be made to describe an exemplary embodiment of the present invention in detail. In this section we shall explain several exemplary embodiments of this invention with reference to the appended drawings. Whenever the shapes, relative positions and other aspects of the parts described in the embodiment are not clearly defined, the scope of the invention is not limited only to the parts shown, which are meant merely for the purpose of illustration. Also, while numerous details are set forth, it is understood that some embodiments of the invention may be practiced without these details. In other instances, well-known structures and techniques have not been shown in detail so as not to obscure the understanding of this description.

Referring toFIG. 1andFIG. 2, an acoustic device100according to an exemplary embodiment includes a housing1having a cover11and a mounting plate12assembled with the cover11for forming a receiving space10, a speaker unit2received in the receiving space10and an electric terminal3electrically connected with the speaker unit2and extends out of the receiving space10for connecting to outer circuit.

The cover11has a rectangular box shape, and includes a rectangular top wall111defining a length direction L, a pair of first sidewalls112extending substantially perpendicular to the top wall111in the length direction L and a pair of second sidewalls113extending substantially perpendicular to the top wall111in a direction perpendicular to the length direction L. A through window110for transmitting sound generated by the speaker unit2to outside is formed in one of the first sidewalls112or one of the second sidewalls113. The through window110has a slit shape and communicates with the receiving space10. In this embodiment, the through window110is formed in the first sidewall112in the length direction L. The first sidewalls112and second sidewalls113are provided with depressions114that are recessed in a direction toward the top wall111.

The mounting plate12has a rectangular shape with a dimension substantially equal to the top wall111. The mounting plate12has a ring shaped projection121protruding toward the top wall111of the cover11for accommodating into the depressions114to assemble with the cover11. The mounting plate12further defines a cut-out portion122in one side thereof, via which the electronic terminal3leads out of the cover11.

The speaker unit2includes a vibration unit, a magnetic circuit unit and a frame4for containing the magnetic circuit unit. The vibration unit comprises a diaphragm21and a voice coil22connected with the diaphragm21for driving the diaphragm21to vibrate. Optionally, the voice coil22may be connected to the diaphragm21via a medium which is directly connected with the diaphragm21. In other words, the voice coil22may be connected to the diaphragm21directly or indirectly. Therefore, the term “connect” here means to connect something to another via a medium or to connect something to another directly without any medium.

The magnetic circuit unit comprises a base board23, a first magnetic conduction member24disposed on a center portion of the base board23, a second magnetic conduction member25disposed on a periphery portion of the base board23for forming a magnetic gap26together with the first magnetic conduction member24. The base board23is made of magnetic conduction materials for effectively conducting magnetic fluxes. At least one of the first and second magnetic conduction members24,25is a permanent magnet. In this embodiment, both the first and second magnetic conduction members24,25are permanent magnets. In an alternative embodiment, the first magnetic conduction member is a permanent magnet and the second magnetic conduction member is made of magnetic conduction materials for effectively conducting magnetic fluxes. Furthermore, the second magnetic conduction member and the base board are formed an integral unit. On the contrary, the first magnetic conduction member is made of magnetic conduction materials for effectively conducting magnetic fluxes and the second magnetic conduction member is a permanent magnet. The first magnetic conduction member and the base board are formed an integral unit.

As shown inFIGS. 2-4, the diaphragm21has a rectangular shape, is parallel to the top wall111of the cover11, and includes a dome211and a suspension212surrounding the dome211. The suspension212includes a flat portion2121for supporting the dome211, an edge portion2122for fixing on the frame4and a connecting portion2123connected between the flat portion2121and the edge portion2122. The dome211is attached onto the flat portion2121by normal means, such as gluing, adhesive and so on. Alternatively, the dome211and the flat portion2121may be integrally formed as one unit. The connecting portion2123protrudes out of the flat portion2121and the edge portion2122. A plurality of corrugations2124are formed on four corners of the connecting portion2123, respectively. In this embodiment, the number of the corrugations2124in each corner equals to each other.

The dome211has a rectangular shape and is parallel to the top wall111of the cover11. The dome211includes an upper surface2111facing the top wall111of the cover11and a lower surface2115opposite to the upper surface2111. The dome211includes a pair of length sides extending in the length direction L of the top wall111of the cover11and a pair of shorter sides2112extending in a direction perpendicular to the length direction L. The length sides are divided into a first length side2113away from the through window110of the cover11and a second length side2114opposite to the first length side2112.

The diaphragm21further comprises a first strength member213attached on the upper surface2111of the dome211. The first strength member213and the dome211may be integrally formed as one unit. Alternatively, the first strength member213and the dome211may be separated part, which are connected with each other by normal means, such as gluing, adhesive, and so on.

In this embodiment, the first strength member213includes four first strength parts2131disposed on the upper surface2111of the dome211, juxtaposed with each other in the length direction L and spaced from each other. Each of the first strength parts2131protrudes toward the top wall111from the upper surface2111and extends from the second length side2114toward the first length side2113. Alternatively, the first strength part2131may be a recess that is recessed in a direction away from the top wall111. Each of the first strength parts2131has a first portion2132close to the first length side2113and a second portion2133opposite to the first portion2132. A rigidity of the second portion2133is higher than that of the first portion2132. A length L1of the second portion2133in the length direction L is higher than a length L2of the first portion2132. Optionally, the length of each first strength part2131in the length direction L is gradually reducing from the second portion2133to the first portion2132. In this embodiment, the first strength parts may have the same shape. Alternatively, the first strength parts may have different shapes. The number of the first strength part is not limited to this, and it may be variable as long as the rigidity of the second portion is higher than that of the first portion.

In this embodiment, the diaphragm21further comprises a plurality of second strength members214, disposed between two adjacent first strength parts2131and close to the first side2113. Specifically, the second strength members214are disposed between the first sections2132of two adjacent first strength parts2131. Each second strength members214has a hemispheric shape and protrudes toward the top wall111of the cover11from the upper surface2111of the dome211. The number of the second strength members214disposed between two adjacent first strength parts2131is variable according to the requirement of the rigidity of the dome211. With the construction of the second strength members, the rigidity of the dome can be adjusted according to the actual requirement. Furthermore, the rigidity of the area close to the through window of the cover and the area away from the through window can be adjusted according to the actual requirement.

While the present disclosure has been described with reference to the specific embodiment, the description of the disclosure is illustrative and is not to be construed as limiting the disclosure. Various of modifications to the present disclosure can be made to the exemplary embodiment by those skilled in the art without departing from the true spirit and scope of the disclosure as defined by the appended claims.