This application claims the priority benefit of Chinese patent Application Filing Serial Number CN 201520073415.1, filed on Feb. 2, 2015, the disclosure of which is herein incorporated by reference in its entirely.
The present disclosure relates to the art of speakers and, particularly to a speaker box with improved the acoustic performances.
In modern consumer electronics, audio capability is playing an increasingly greater 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 general, the conventional speaker box includes a micro-speaker, and a case for receiving the micro-speaker. To achieve a better audio performance, the case is usually provided with a large inner cavity, as well as an acoustic emission passage for sound generated by the micro-speaker to pass through.
Typically, the magnitude of the sound is expressed in dB and represented as a sound pressure level (SPL) or efficiency in a speaker box. This means ‘the average magnitude of the sound that can be heard 1 m from the micro-speaker, when an output of 1 w is transferred from an amplifier to the micro-speaker’. Therefore, the greater the sound pressure is, the greater the reproduced sound is with the same output of the amplifier.
Generally, the acoustic emission passage ends at a lateral surface of the case by an emitting opening which is defined at a position deviating from the micro-speaker's center. As a line for emitting sounds gets narrower, a sound pressure in low frequencies becomes lower. Specifically, in low frequencies having relatively large amplitudes, an amount of pushing the air increases. As the air passes through such a narrow line, the acoustic resistivity of the one portion of the diaphragm close to the emitting opening is greater than that of the other portion of the diaphragm far away from the opening. Consequently, the sound pressure imposed on the surface of the diaphragm becomes unbalanced, which degrades low sound characteristics.
In view of the above described situation, there exists a need for an improved speaker box which can substantially avoid the above-identified problems.
Many aspects of the embodiments 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.
A speaker box in accordance with an exemplary embodiment of the present disclosure is used for converting audio electrical signals to audible sounds. In general, the speaker box includes a cabinet, and a speaker unit mounted in the cabinet. The cabinet has an acoustic opening provided in one sidewall of cabinet for emitting sounds. The speaker unit has a magnetic circuit, a vibrating unit corresponding to the magnetic circuit, and a PCB board electrically connecting with the vibrating unit for conducting electrical signals to the vibrating unit.
Referring to
In the present embodiment, the case 11 which is composed of an injection-molded product, includes a bottom wall 110 in shape of rectangle, a sidewall 111 extending upwardly and perpendicularly from the bottom wall 110, and an acoustic window 112 formed in the sidewall 111 by injection molding technology for communicating with the speaker unit 13 for emitting sounds. Hereby, while the speaker unit 13 is configured in the receiving space 100 and faced the bottom wall 110 of the case 11 so as to provide an acoustic device with side acoustic emission structure. The shape of the cabinet 1 is not restricted to rectangle as described in the embodiment. In another embodiment, the case 11 may be configured to be like a bowel and has a chamber for accommodating the speaker unit 13.
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Because the first end 136a is lower than the second end 136b along the vibrating direction Y-Y, the second end 136b is more easily to vibrate, and the second end 136b can achieve a better mechanical compliance than the first end 136a, and thus the diaphragm can perform a balanced vibration. The problem of unbalanced sound pressure imposed on the surface of the diaphragm is solved.
While the present disclosure has been described with reference to the specific embodiments, the description of the disclosure is illustrative and is not to be construed as limiting the disclosure. Various modifications to the present disclosure can be made to the exemplary embodiments by those skilled in the art without departing from the true spirit and scope of the disclosure as defined by the appended claims.
Number | Date | Country | Kind |
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2015 2 0073415 U | Feb 2015 | CN | national |
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Number | Date | Country | |
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20160227305 A1 | Aug 2016 | US |