Speaker

Information

  • Patent Grant
  • 6735323
  • Patent Number
    6,735,323
  • Date Filed
    Thursday, January 30, 2003
    21 years ago
  • Date Issued
    Tuesday, May 11, 2004
    20 years ago
Abstract
A speaker includes a T-shape iron, a ring magnet, a pole plate, a frame, a diaphragm, a coil core portion, a voice coil, a first annular corrugated plate, and at least one second annular corrugated plate. The second annular corrugated plate has is bonded to an inner side or an outer side of an outer section of the first annular corrugated plate and spaced from the coil core portion, thereby increasing a thickness and strength of an outer section of the first annular corrugated plate for bearing higher power such that the speaker generates clear sound and that an inner section of the first annular corrugated plate generates sufficient sound pressure when a power outputted by the speaker is low.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The present invention relates to a speaker that can produce excellent sound quality as well as sufficient sound pressure regardless of the power value by means of providing at least one additional annular corrugated plate.




2. Description of Related Art





FIGS. 1 and 2

of the drawings illustrate two typical conventional speakers. As illustrated in

FIG. 1

, the speaker includes a T-iron


10


, a ring magnet


11


mounted around a central protrusion


101


projecting from a central portion of the T-iron


10


, a pole plate


12


mounted on top of the ring magnet


11


and spaced from the central protrusion


101


of the T-iron


10


, a frame


13


mounted on top of the pole plate


12


, a diaphragm


15


supported by an edge


131


of the frame


13


, a coil core portion


14


surrounding the central protrusion


101


of the T-iron


10


, a voice coil


141


wound around the coil core portion


14


and spaced from the pole plate


12


, and an annular corrugated plate


16


which is mounted around and supports the coil core portion


14


. The voice coil


141


, when energized, generates vibration waves for causing the annular corrugated plate


16


and the diaphragm


15


to vibrate. The annular corrugated plate


16


is provided for showing the bass of the sound. The speaker of

FIG. 2

is similar to that of

FIG. 1

, except that an additional annular corrugated plate


16


is provided.




The damping strength of the annular corrugated plate


16


affects the restoration and the resonance frequency of the coil core portion


14


; namely, the effectiveness of oppressing inertial damping by annular corrugated plate


16


affects the power and sound pressure (volume) withstandable by the speaker. Thus, the number of the annular corrugated plates


16


for a speaker depends on the power. A speaker having only one annular corrugated plate


16


shown in

FIG. 1

may produce clear sound when the power is low, but the effectiveness of oppressing inertial damping by the annular corrugated plate


16


drops when the power is high, as the restoration force and strength of the annular corrugated plate


16


are insufficient. As a result, the annular corrugated plate


16


overvibrates and the sound quality is lost. On the other hand, a speaker having two annular corrugated plates


16


shown in

FIG. 2

solves the problems encountered in high power situation, but the restoration force and the damping are too large when the power is low, resulting in insufficient sound pressure (the volume is too low). The dilemma in sound quality for high power and lower power is a bottleneck to speakers.




OBJECTS OF THE INVENTION




An object of the present invention is to provide a speaker that can produce excellent sound quality as well as sufficient sound pressure regardless of the power value by means of providing at least one additional annular corrugated plate. The strength and the restoration force of the whole annular corrugated plate are increased such that the speaker may bear higher power and maintain the volume.




SUMMARY OF THE INVENTION




A speaker in accordance with the present invention includes a T-shape iron having a central protrusion on a central portion thereof, a ring magnet mounted around the central portion of the T-shape iron, a pole plate mounted on top of the ring magnet and spaced from the T-shape iron, a frame mounted above the pole plate, a diaphragm mounted to the frame, a coil core portion mounted around the central protrusion of the T-shape iron, a voice coil wound around the voice core portion, a first annular corrugated plate mounted around the voice core portion and spaced from the voice coil, the first annular corrugated plate having an inner section adjacent to the coil core portion and an outer section distal to the coil core portion, and at least one second annular corrugated plate. The second corrugated plate is bonded to an inner side or an outer side of the outer section of the first annular corrugated plate and spaced from the coil core portion, thereby increasing a thickness and strength of the outer section of the first annular corrugated plate for bearing higher power such that the speaker generates clear sound and that the inner section of the first annular corrugated plate generates sufficient sound pressure when a power outputted by the speaker is low. The second annular corrugated plate has an inner diameter greater than that of the first annular corrugated plate.




The diaphragm includes an outer periphery that is bonded to an edge of the frame, and a reinforcing plate is bonded to an outer side of the edge of the frame.




In an embodiment of the invention, a second annular corrugated plate and a third annular corrugated plate are bonded to the outer section of the first annular corrugated plate and spaced from the coil core portion, thereby increasing a thickness and strength of the outer section of the first annular corrugated plate for bearing higher power such that the speaker generates clear sound and that the inner section of the first annular corrugated plate generates sufficient sound pressure when a power outputted by the speaker is low.




Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a sectional view of a conventional speaker;





FIG. 2

is a sectional view of another conventional speaker;





FIG. 3

is a sectional view of a speaker in accordance with the present invention; and





FIG. 4

is a sectional view of another embodiment of the speaker in accordance with the present invention.











DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS




The present invention is now to be described hereinafter in detail, in which the same referential numerals are used for the same parts as those in the prior art.




Referring to

FIG. 3

, a speaker in accordance with the present invention includes a T-iron


10


, a ring magnet


11


mounted around a central protrusion


101


projecting from a central portion of the T-iron


10


, a pole plate


12


mounted on top of the ring magnet


11


and spaced from the central protrusion


101


of the T-iron


10


, a frame


13


mounted on top of the pole plate


12


, a diaphragm


15


supported by an edge


131


of the frame


13


, a coil core portion


14


surrounding the central protrusion


101


of the T-iron


10


, a voice coil


141


wound around the coil core portion


14


and spaced from the pole plate


12


, and a first annular corrugated plate


16


which is mounted around and supports the coil core portion


14


. The voice coil


141


, when energized, generates vibration waves for causing the first annular corrugated plate


16


and the diaphragm


15


to vibrate. The first annular corrugated plate


16


is provided for showing the bass of the sound and includes an inner periphery bonded to the coil core portion


14


and an outer periphery


161


bonded to the frame


13


. The first annular corrugated plate


16


includes an inner section adjacent to the coil core portion


14


and an outer section distal to the coil core portion


14


.




Of more importance, at least one second annular corrugated plate


17


is mounted to one of an inner side and an outer side of the first annular corrugated plate


16


. In the embodiment shown in

FIG. 3

, a second annular corrugated plate


17


having an inner diameter greater than that of the first annular corrugated plate


16


is bonded to the outer section of the outer side (upper side in

FIG. 3

) of the first annular corrugated plate


16


and spaced from the coil core portion


14


. Thus, the thickness and the strength of the first annular corrugated plate


16


are increased at the outer section thereof to which the second annular corrugated plate


17


is bonded. Namely, the inner section of the first annular corrugated plate


16


has a smaller restoration force and a lower effectiveness in oppressing inertial damping, and the outer section the first annular corrugated plate


16


has a larger restoration force and a greater effectiveness in oppressing inertial damping.




When the output power of the speaker is low, the inner section of the first annular corrugated plate


16


produces clear sound. The inner section of the first annular corrugated plate


16


receives the energy of the vibration waves generated by the voice coil


141


and generates resonance together with the diaphragm


15


, thereby generating sound waves having sufficient sound pressure.




On the other hand, when the output power of the speaker is high, the outer section of the first annular corrugated plate


16


produces clear sound with the help of the second annular corrugated plate


17


. More particularly, the excessive energy of the vibration waves that cannot be received by the inner section of the first annular corrugated plate


16


are received by the outer section of the first annular corrugated plate


16


and the second annular corrugated plate


17


bonded to the outer section of the first annular corrugated plate


16


, and the whole first annular corrugated plate


16


(including the second annular corrugated plate


17


) cooperates with the diaphragm


15


to provide resonance without sacrificing the quality. Thus, the speaker in accordance with the present invention may generate excellent sound quality and sufficient sound pressure regardless of the output power, which is a breakthrough in speakers.




The second annular corrugated plate


17


can be made from a material different from that for the first annular corrugated plate


16


, and the thicknesses of the first annular corrugated plate


16


and the second annular corrugated plate


17


can be altered.





FIG. 4

illustrates another embodiment of the speaker in accordance with the present invention, wherein the second annular corrugated plate


17


is bonded to an outer section of an inner side of the first annular corrugated plate


16


. Operation of the speaker is substantially the same as that of the first embodiment of FIG.


3


. Further, in order to increase the power-bearing capacity of the speaker and to maintain the sound pressure, an annular reinforcing plate


18


is securely attached to the edge


131


of the frame


13


. The annular reinforcing plate


18


is configured to have a shape and curvature substantially the same as those of an outer portion of the edge


131


, and the annular reinforcing plate


18


is bonded to the outer portion of the edge


131


, as shown in FIG.


4


. The annular reinforcing plate


18


increases the supporting strength for the speaker, thereby increasing the power-bearing capacity of the speaker (i.e., the speaker may output higher power) and maintaining the sound pressure at a sufficient level.




While the principles of this invention have been disclosed in connection with specific embodiments, it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention, and that any modification and variation without departing the spirit of the invention is intended to be covered by the scope of this invention defined only by the appended claims.



Claims
  • 1. A speaker comprising:a T-shape iron having a central protrusion on a central portion thereof; a ring magnet mounted around the central portion of the T-shape iron; a pole plate mounted on top of the ring magnet and spaced from the T-shape iron; a frame mounted above the pole plate; a diaphragm mounted to the frame; a coil core portion mounted around the central protrusion of the T-shape iron; a voice coil wound around the coil core portion; a first annular corrugated plate mounted around the coil core portion and spaced from the voice coil, the first annular corrugated plate having an inner section adjacent to the coil core portion and an outer section distal to the coil core portion; and at least one second annular corrugated plate bonded to one of an inner side and an outer side of the outer section of the first annular corrugated plate and spaced from the coil core portion, thereby increasing a thickness and strength of the outer section of the first annular corrugated plate for bearing higher power such that the speaker generates clear sound and that the inner section of the first annular corrugated plate generates sufficient sound pressure when a power outputted by the speaker is low, said at least one second annular corrugated plate having an inner diameter greater than that of the first annular corrugated plate.
  • 2. The speaker as claimed in claim 1, wherein said second annular corrugated plate is bonded to the outer side of the first annular corrugated plate.
  • 3. The speaker as claimed in claim 1, wherein said second annular corrugated plate is bonded to the inner side of the first annular corrugated plate.
  • 4. The speaker as claimed in claim 1, wherein the diaphragm includes an outer periphery that is bonded to an edge of the frame, further including a reinforcing plate bonded to the edge of the frame.
  • 5. The speaker as claimed in claim 4, wherein the reinforcing plate is bonded to an outer side of the edge of the frame.
US Referenced Citations (4)
Number Name Date Kind
2295483 Knowles Sep 1942 A
3767004 Liebscher Oct 1973 A
6031925 Shteyn Feb 2000 A
6173065 Lin Jan 2001 B1