Patent Application
20130287244
1. Technical Field
The disclosure generally relates to electroacoustic transducers, and more particularly to a loudspeaker with a strong frame that can improve the sound quality of the loudspeaker.
2. Description of Related Art
With the continuing development of audio and sound technology, loudspeakers have been widely used in electronic devices such as mobile phones, computers, televisions and other devices providing audio capabilities.
A typical loudspeaker includes a frame, a diaphragm connected with the frame, a voice coil joined to the diaphragm, and a magnet provided inside the frame. The magnet compels the voice coil to oscillate, and the oscillating voice coil drives the diaphragm to push ambient air and thereby generate sound. However, the frame of the loudspeaker is thin and easily damaged during assembly of the loudspeaker. Furthermore, the frame is liable to oscillate with the voice coil and generate a noise, thereby reducing the sound quality of the loudspeaker.
What is needed, therefore, is a loudspeaker which can overcome the described limitations.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
Referring also to
The yoke 200 includes a circular bottom plate 210, and a side plate 220 extending upwardly from the bottom plate 210. The bottom plate 210 and the side plate 220 cooperatively define a receiving space 230 therebetween. An outer diameter of the yoke 200 is substantially equal to an inner diameter of the annular connecting portion 122. The yoke 200 is engaged in the annular connecting portion 122, with a top surface of the side plate 220 of the yoke 200 abutting against the annular blocking wall 126 of the annular connecting portion 122.
The magnet 300 is received in the receiving space 230 of the yoke 200 and secured to the bottom plate 210 of the yoke 200. The washer 400 is fixed on the magnet 300 to shield a magnetic field generated by the magnet 300 within the yoke 200. Therefore, the magnetic field generated by the magnet 300 is limited between the washer 400 and the bottom plate 210 of the yoke 200, to strengthen an intensity of the magnetic field.
The diaphragm 500 is attached to an upper surface of the annular flange 110. The diaphragm 500 includes a central area 510 in a center thereof, and an annular joint area 520 surrounding but spaced from the central area 510. The central area 510 is dome-shaped. The joint area 520 is curved upwardly to have a shape resembling the shape of half a doughnut (or half a torus). The joint area 520 has an arch-shaped (or arc-shaped) transverse cross-section. A plurality of grooves 530 are defined in the joint area 520. The grooves 530 include a first group of grooves 531 extending from an inner circular side of the joint area 520 adjacent to the central area 510 to a top portion of the joint area 520, and a second group of grooves 532 extending from an outer circumferential side of the joint area 520 to the top portion of the joint area 520. The first group of grooves 531 and the second group of grooves 532 are spaced from one another, and are arranged alternately to increase a rigidity of the diaphragm 500.
The voice coil 600 is an annular electrically conductive coil. One terminal of the voice coil 600 is secured to a joint portion of the diaphragm 500 located between the central area 510 and the joint area 520. Another terminal of the voice coil 600 is inserted into a gap between the side plate 220 of the yoke 200 and the magnet 300.
In operation of the loudspeaker 10, when a driving current is applied to the voice coil 600, the voice coil 600 generates a magnetic field. The magnetic field generated by the voice coil 600 and the magnetic field generated by the magnet 300 interact and compel the voice coil 600 to oscillate. The oscillating of the voice coil 600 drives the diaphragm 500 to push ambient air and thereby generate sound. Because the frame 100 includes the annular flange 110 and the supporting bracket 120, and the supporting bracket 120 includes the two mounting portions 121 mounted on the two opposite sides of the annular flange 110, the mounting portions 121 can increase the intensity of the annular flange 110 and help ensure that the frame 100 does not easily oscillate with the diaphragm 500. Therefore, noise generate by oscillating of the frame 100 is reduced or even eliminated, and the sound quality of the loudspeaker 10 is improved. In addition, with the supporting bracket 120, the frame 100 is not easily damaged in assembly of the loudspeaker 10.
It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210127733.2 | Apr 2012 | CN | national |
