JP6521606B2 - Low-profile loudspeaker converter - Google Patents

Description

Cross-reference to related applications

  This application is related to U.S. Provisional Application No. 61 / 895,653, filed October 25, 2013, and claims the benefit of said provisional application, the contents of which are incorporated by reference in their entirety. Is incorporated herein by reference.

  The invention is in the category of electro-acoustic transducers, and more particularly, the invention is in the category of transducers used in loudspeaker systems.

  In the audio field, it is desirable for loudspeakers to be configured for use with smaller thin form factor products while maintaining fidelity.

  The modern consumer electronics market is packaged in an all-compact structure with more and more features (eg, wireless connection chipset; larger user interface; audio signal processing module; amplification; rechargeable battery etc) Require loudspeakers to be integrated within the These limitations generally lead to an increase in the size of the associated electronics and a reduction in the size of the package size dedicated to the loudspeaker enclosure volume. There are also many other applications that incorporate a non-depth cabinet structure, such as a cabinet structure in a very thin TV screen, where significant reductions in effective cabinet depth and volume may impair converter performance. .

  Miniature transducers are generally chosen as a solution for such systems. This is because these transducers require a smaller acoustic volume than conventional sized speakers. Nevertheless, small transducers have low efficiency and limited output when reproducing low frequencies at high levels as a result of impaired parameters including limited diaphragm surface area and cubic volume displacement. It is well known to give.

  There is a need for an improved transducer that can be incorporated into smaller or thinner forms of audio products while achieving the desired sound output and high fidelity.

  The present invention provides a simple and effective transducer that can maintain the diaphragm surface area and the displacement of a transducer of conventional size while significantly reducing the height profile of the transducer. In a preferred embodiment, the low-profile loudspeaker transducer incorporates the inverse relationship between the surround suspension and the spider suspension where the spider suspension is disposed above the surround suspension and housed within the volume of the projecting dome diaphragm or the counter diaphragm. This allows for a more depthless structure while maintaining the stability of the voice coil in the voice coil gap during diaphragm deflection to reduce the rocking of the voice coil. In many preferred embodiments, the coupling member acts as an intermediate connector between the voice coil former and the diaphragm, thereby providing attachment and support with increased contact surface area to the diaphragm. These and other aspects and advantages will be apparent from the specification disclosed hereinafter.

  The figures depict a preferred embodiment of the present invention for illustrative purposes only. Those skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be used without departing from the principles of the described invention.

FIG. 1 is a cutaway view of a first example loudspeaker transducer of the present invention. FIG. 6 is a cross-sectional view of another example loudspeaker transducer of the present invention. FIG. 1 is an enlarged cutaway view of a first example loudspeaker transducer of the present invention. FIG. 6 is a cutaway view of a second example loudspeaker transducer of the present invention. FIG. 6 is an enlarged cut-away view of a second example loudspeaker transducer of the present invention. FIG. 7 is a cutaway view of a third example loudspeaker transducer of the present invention. FIG. 7 is an enlarged cut-away view of a third example loudspeaker transducer of the invention; FIG. 7 is a cutaway view of a fourth example loudspeaker transducer of the present invention. FIG. 7 is a cutaway view of a fifth example loudspeaker transducer of the invention; FIG. 10 is an enlarged cutaway view of a fifth example loudspeaker transducer of the invention; FIG. 6 is a cutaway view of a sixth example loudspeaker transducer of the invention; FIG. 6 is an enlarged cutaway view of a sixth example loudspeaker transducer of the invention; Figure 7 is a cutaway view of a seventh example loudspeaker transducer of the invention; Figure 7 is an enlarged cutaway view of a seventh example loudspeaker transducer of the invention; FIG. 10 is a cutaway view of a eighth example loudspeaker transducer of the invention; Figure 10 is a cutaway view of a ninth example loudspeaker transducer of the invention; FIG. 10 is an enlarged cutaway view of a ninth example loudspeaker transducer of the invention; Figure 10 is a cutaway view of a tenth example loudspeaker transducer of the invention; Figure 11 is a cross-sectional view of an eleventh example loudspeaker transducer of the invention; FIG. 16 is a diagram of a diaphragm component of an eleventh example of a loudspeaker converter of the invention. Figure 12 is a cross-sectional view of a twelfth example loudspeaker transducer of the invention; Figure 14 is a cross section of a thirteenth example of a loudspeaker converter according to the invention; Figure 14 is a cross-sectional view of a fourteenth example of a loudspeaker converter according to the invention; Figure 15 is a cross section of a fifteenth example loudspeaker transducer of the invention; Figure 16 is a cross sectional view of a sixteenth example loudspeaker transducer of the invention; Figure 17 is a cross-sectional view of a seventeenth example loudspeaker transducer of the invention; Figure 18 is a cutaway view of an eighteenth example loudspeaker transducer of the invention;

  The mechanical and magnetic structure of a loudspeaker transducer constructed in accordance with the principles of the present invention and embodying the principles of the present invention may be considered as the nature of the system packaging, the desired frequency response, output capability, and / or desirable. Many forms may be made depending on factors such as the level of linearity being evaluated. The target price of a particular magnetic transducer of the present invention is also a factor with increased frequency response, maximum power capability, and increased linearity generally associated with increased cost.

  Thus, in the following, a number of different examples of the invention will be described. In the following discussion, elements that may or may be common between the various examples may be assigned the same reference characters.

  Referring initially to FIGS. 1A and 1B, these figures depict a first example of a preferred embodiment of the low-profile loudspeaker transducer 10a of the present invention. The first example transducer 10a comprises a frame 11, which is shown coupled to a T-yoke 12 preferably made of an iron material, in this example to form a venting pole piece opening 22. Be This and other embodiments may be configured with or without vent openings in the Y yoke. The connection spacer 11a may be used as an intermediate coupling plate which forms an interface between the back plate 12a of the T-yoke 12 and the magnet structure 13, which in FIG. 1A is accompanied by two stacked ring magnets. Although shown with a single ring magnet in FIG. 1B and may be of ceramic or ferrite material, any of a wide variety of magnet materials commonly used in the field of loudspeaker transducers May be incorporated.

  Preferably, an iron top plate 14 is coupled to the upper end of the magnet structure 13 which forms a magnetic circuit, preferably with the iron T yoke 12 and the back plate 12a. In this embodiment of FIGS. 1A and 1B, the seamless convex shape in which the diaphragm 18 is connected to the frame 11 via the flexible surround suspension 16 in concave or convex form (inverse and non-inverted forms respectively) Shown as a dome. The invention does not limit the shape of the surround in this way, but can take into account any surround form traditionally implemented with acoustic transducers such as multi-roll surround form, double surround form or single surround form. That is, FIGS. 1A and 1B show a single surround 16. However, in other embodiments of the present invention, the transducer 10A may include one or more additional surround suspensions disposed radially outward of the illustrated surround 16 and / or radially inward of the surround. Additional surround suspensions may be formed similar to or different from the surround suspension 16. Also, the surround suspension 16 and / or any further surround suspension can have any desired shape. For example, the surround suspension may have a convex or concave curved cross-sectional shape as shown in FIGS. 1A and 1B respectively, or alternatively, the surround suspension may have a linear cross-sectional shape or It may have a cross-sectional shape having both straight and curved aspects. Although surround surround 16 is shown here with ribs 16b in FIGS. 1A and 1B, the surround suspension may be configured with or without ribs, and surround suspension 16 is shown in FIG. It may be configured as a non-reverse convex form as shown as 16a.

  The diaphragm 18 is coupled to the voice coil former 21 via the coupler 20, and the coupler 20 is connected between the diaphragm 18 and the voice coil former 21. In this preferred embodiment, the voice coil former 21 is not directly connected to the diaphragm 18. A conductive voice coil 19 is attached to the voice coil former 21 and suspended within the magnetic field gap between the top plate 14 and the upper end of the T yoke 12 without contacting the T yoke 12 and the top plate 14.

  The diaphragm 18 is also attached to the spider suspension 17 attached to the top plate 14 and suspended by the spider suspension 17, and the diaphragm 18 minimizes oscillation of the voice coil 19 during dynamic deflection of the diaphragm 18. It is placed in the upper plane of the surround suspension 16 to provide stability to the diaphragm 18 to limit. FIG. 1B shows a ring separator 25 connecting the inner periphery of the spider suspension 17 to the top plate 14. This ring separator serves to control the spider suspension attachment point to both the diaphragm 18 and the magnetic motor structure. In the illustrated exemplary embodiment, the ring separator 25 is disposed on the top plate 14 and extends annularly around the voice coil former 21 and the conductive voice coil 19. The ring separator has a generally square cross-sectional shape and may include a sheet on its upper surface for receiving and holding the end of the spider suspension 17. The ring separator 25 may extend continuously or discontinuously around the voice coil former 21, and the ring separator may have a cross-sectional shape forming a curvilinear aspect and / or a linear aspect. The ring separator 25 may extend in an annular form as shown, or any other desired geometric form, for example pentagonal, hexagonal, elliptical, diamond shaped on the top plate 14 Good.

  An input terminal 15 is adapted to receive a voice input signal, and a conductive wire (not shown) connects the input terminal 15 to the voice coil 19.

  FIG. 2 is an enlarged cut-away view of the same basic device of FIG. 1 showing an example of coupler 20 in greater detail and in detail showing how the coupler is connected to voice coil former 21. Diaphragm 18 is spaced apart from coupler 20 for illustrative purposes. When the coupler 20 has a larger surface area than the top end of the voice coil former 21 so that it is coupled to the diaphragm, the coupler 20 has greater diaphragm / coupler integrity, less diaphragm breakage, and a larger band It can be seen that it forms a larger connection interface with more piston-like diaphragm mobility across the width. The coupler 20 can be connected directly to the diaphragm 21 or can be coupled via a flexible or damping interface material. Also, the coupler 20 can have different regular or irregular geometric forms with respect to its outer edge, and can not be formed simply in a circle, but can form a pentagon, a hexagon, or the like.

  FIG. 3 shows a cutaway drawing depicting a second example thin loudspeaker transducer arrangement 10b, and FIG. 3A shows an enlarged drawing. A second example 10b is similar to the device in FIG. 1, but the surround 16a is shown as a non-recumbent form and the dome diaphragm 18a also has a central dust cap cover 24 to complete the diaphragm 18a. A two-piece diaphragm including an associated central notch opening 28, with the diaphragm 18 a attached to the coupler 20 and a convex central dust cap 24 attached to one or both of the coupler 20 and the voice coil former 21.

  FIG. 4 shows a cutaway drawing depicting a third example thin loudspeaker transducer arrangement 10c, and FIG. 4A shows a magnified view. A third example 10c is substantially the same as the device of FIG. 1, but the surround suspension 16a is shown as a non-reversal convex form. A reverse concave surround suspension and a non reverse convex surround suspension may be used interchangeably throughout the various examples. The device 10 c is optimized for use as a woofer or subwoofer application to reproduce low frequencies which may require a larger deflection of the diaphragm 18, so that it is attached to the outer portion of the diaphragm 18 and the top plate 14 An even greater linear deflection can be achieved by the application of dual spider suspensions 17a, 17b attached to the ring separator 25 being made. Here, the top plate 14 may include a sheet for receiving and holding the ring separator 25. In the illustrated embodiment, the ring separator 25 has a substantially linear cross-sectional shape having one of the spider suspension 17 a mounted on the upper side of the separator 25 and the other suspension 17 b mounted on the lower side of the separator 25. It is an accompanying ring-shaped member. As discussed in connection with FIG. 1B, the ring separator 25 can include any desired cross-sectional shape, and in any desired form to provide continuous or discontinuous attachment of the spider suspension. Cross the top plate 14. The dual spider suspension 17a, 17b acts as a more stable centering device, thereby maintaining the position of the voice coil 19 and rubbing it against the top plate 14 during large signal low frequency excursions. I will try to avoid it.

  FIG. 5 shows a cutaway diagram depicting a fourth example thin loudspeaker transducer device 10d. The fourth example 10d is substantially the same as the device of FIG. 1, but the surround suspension 16a is shown as a non-reversal convex form and the magnet structure 13 comprises two ring magnets 13a, 13b, in that case The ring magnet 13b has a larger outer diameter, a larger amount of magnet material, and more magnetic energy, such that the magnet structure 13 has a larger total magnetic energy. This may be used to increase the total magnetic energy or to create a larger clearance for greater deflection of the diaphragm 18 and the spider suspension 17 with respect to the top plate 14 and the upper magnet 13b.

  FIG. 6 shows a cut-away drawing depicting a fifth example thin loudspeaker transducer device 10e, and FIG. 6A shows an enlarged view. Referring to the apparatus of FIG. 1, the fifth example 10e incorporates differences with respect to the surround suspension 16a shown as a non-inverted convex geometric arrangement, and the diaphragm 18b comprises the surround suspension 16a for the diaphragm 18b. And have an extended outer diameter 18c extending beyond the attachment point of. Also, the loudspeaker transducer 10e advantageously utilizes a larger diameter diaphragm extension by locating the attachment of the stabilized spider suspension 17c to the diaphragm extension 18c below the attachment of the surround suspension 16a. .

  In various preferred embodiments of the present invention, the spider suspension 17c may be mounted or positioned above or below the plane of the surround suspension 16a and, in certain embodiments, approximately in the same plane as the surround suspension 16a. May be attached or positioned. As can be seen from FIG. 18, the spider suspension 31 may be located well below the surround suspension 16 or even at the bottom of the transducer behind the back plate 12b.

  FIG. 7 shows a cut away view depicting a sixth example thin loudspeaker transducer arrangement 10f, and FIG. 7A shows an enlarged view. A sixth example 10f is similar to the device of FIG. 1, but the surround 16a is shown as a non-recumbent form, and the convex dome diaphragm 18a is a central flat dust to complete the diaphragm 18a. It includes a central cutout opening 28 in which the cap cover 24 is mounted. The diaphragm 18a may be attached to the coupler 20 and the flat central dust cap 24 may be attached to one or both of the diaphragm 18a and the voice coil former 21.

  FIG. 8 shows a cut-away view depicting a seventh example thin loudspeaker transducer device 10g, and FIG. 8A shows an enlarged view. A seventh example 10g is similar to the device of FIG. 6, but configured as a thin coaxial transducer in which the high frequency tweeter transducer 27 is mounted within the notch of the opening 28 of the diaphragm 18a. The tweeter 27 may be mounted on the T-yoke 12 within the venting pole piece opening 22, spaced from the inner surface of the voice coil former 21. The diaphragm 18 a is attached to the coupler 20, and the coupler 20 is attached to the voice coil former 21.

  FIG. 9 shows a cutaway drawing depicting an eighth example thin loudspeaker transducer device 10 h. The eighth example 10h is similar to the device of FIG. 1, but the main difference is that the magnet structure 13c is mounted inside the voice coil former 21. In this embodiment, the magnet structure 13c preferably uses at least one high energy magnet 13d, such as neodymium or samarium cobalt. In order to well receive the magnet structure 13c, the U-yoke structure 12c is disposed outside the magnet structure 13c and the voice coil former 21, and the top plate 14a is disposed inside the voice coil former 21. In this embodiment, the opening 22 of the T yoke 12 of another example is replaced with the ventilation opening 22a of the U yoke 12c and the magnet structure 13c. Alternatively, the magnet structure 13c of this embodiment 10h may consist of one or more disc magnets without holes in the center.

  FIG. 10 shows a cut-away drawing depicting a ninth example thin loudspeaker transducer device 10i, and FIG. 10A shows a magnified view. In the ninth example 10i, in this embodiment, the coupler 20b has a top cover 23 across the top of the voice coil former 21 forming a very wide surface contact area between the coupler 20b and the diaphragm 18, Thus, it is essentially the same as the device of FIG. 1 except that it increases stiffness across the center of the diaphragm 18 to control the diaphragm failure mode and improve the frequency response of the transducer 10i.

  11 shows an enlarged view depicting a tenth example thin loudspeaker transducer 10j similar to the apparatus of FIG. 10, but with the coupler 20c fitted over the upper end of the voice coil former 21 and of the diaphragm 18. It is an upper end cup that mounts over a wide surface area, which improves the structural integrity of the diaphragm 18.

  12 replaces the convex dome diaphragm 18 of FIG. 2 with a frusto-conical, reverse convex conical structure 18c (shown in FIG. 12A) having a top central opening 28 of the same basic structure as the basic structure of FIG. FIG. 16 shows a cross-sectional view depicting a thin loudspeaker transducer 10k of an eleventh example. The diaphragm 18 c is connected to the coupler 20, and the flat dust cap 24 a is attached to the opening 28 and one of the voice coil former 21 and the second coupler 20 d attached to the inner periphery of the voice coil former 21. Or attached to both. The side surface 18d of the conical diaphragm 18c may be straight or be somewhat curved in a convex or concave form.

  FIG. 13 shows a cross-sectional view depicting a thin loudspeaker transducer 10l of a twelfth example of the same basic structure as the basic structure of FIG. 12, where the flat top dust cap 24a of FIG. The concave dust cap 24 b is attached to the opening 28 and to one or both of the voice coil former 21 and the diaphragm 18 b attached to the coupler 20.

  14 shows a cross-sectional view depicting a thin loudspeaker transducer 10m of a thirteenth example of the same basic structure as the basic structure of FIG. 13, where the concave dust cap 24b and diaphragm 18b of FIG. The inverted conical diaphragm is coupled to the voice coil former 21 via the coupler 20 and to one or both of the voice coil former 21 and the diaphragm 18 b attached to the coupler 20.

  FIG. 15 is replaced with a rounded convex dust cap 24 c attached to one or both of the voice coil former 21 and the diaphragm 18 b in FIG. Figure 14 shows a cross-sectional view depicting a thin loudspeaker converter 10n of a fourteenth example of the same basic structure as the basic structure. The diaphragm 18 b is attached to the coupler 20 and to the voice coil former 21.

  In various embodiments, it is generally preferred to attach the diaphragm 18 to the coupler 20, but optionally the diaphragm may be attached directly to the voice coil former 21 without the coupler 20, or the diaphragm 18 may be , And may be attached to both the voice coil former 21 and the coupler 20.

  16 shows a cross-sectional view depicting a thin loudspeaker transducer 10o of a fifteenth example of the same basic structure as the basic structure of FIG. 15, where the rounded convex dust cap 24c of FIG. Inverted to concave form. Diaphragm 18b is shown attached to coupler 20 and, in this example, dust cap 24d is attached to diaphragm 18b.

  FIG. 17 is similar to the embodiment of FIG. 12 except that the standard coupler 20 of FIG. 12 is replaced by a flexible coupler 29 attached thereto between the top dust cap 24a and the voice coil former 21. Fig. 6 shows a cross-sectional view depicting an example thin loudspeaker converter 10p. The dust cap 24a is attached to the diaphragm 18b. The flexible coupler 29 can be configured as an open structure with a flexible sidewall 30, or it can be a closed / sealed structure in which air is contained inside the flexible coupler 29 with additional rigidity. Also, resistive losses can be incorporated into the flexible coupler 29. The flexible coupler 29 can be used as a mechanical low pass filter by gradually separating the voice coil former 21 from the dust cap 24a and the diaphragm 18b to essentially form a bandpass system. Alternatively, the flexible coupler 29 can be configured as a mechanical resonator that forms a resonance in which the flexibility of the coupler and the moving mass of the diaphragm 18b can be used to adjust the high frequency amplitude response of the loudspeaker transducer 10p. .

  FIG. 18 shows a cross-sectional view depicting a seventeenth example low profile loudspeaker transducer 10 q that is the same as the device of FIG. 2 with the addition of a rear suspension 31, the rear suspension 31 being on the underside of the back plate 12 b Mounted and attached to the connecting rod 32 projecting through the opening 22 of the t-yoke to couple the rear suspension 31 to the diaphragm 18, in this case the rear suspension 31 is of the voice coil former 21 during a large deflection of the diaphragm 18. Add more stability to minimize rocking or twisting. In another embodiment, the coupling structure replacing the coupling rod 32 can be placed outside the magnet structure with another rear spider having a large outer diameter, such as the neodymium structure shown in FIG. This can be a particularly useful approach with small diameter magnet structures. With the application of the spider suspension 31, the spider suspension 17 may be removed from the transducer or may be used in conjunction with the suspension spider 31.

  In various embodiments, the diaphragm 18 can be formed from many materials including aluminum, woven titanium, paper pulp, and a wide variety of materials known in the art for loudspeaker transducer materials.

  In the various embodiments disclosed, the present invention takes advantage of the space provided by the geometry of the projecting dome diaphragm or inverted conical diaphragm 18 to introduce the magnet structure 13 into the concave inner cavity of the diaphragm 18. By pulling it up, it can reduce the overall height of the transducer. Due to the short distance requirement between the diaphragm and the motor, the spider 17 is configured into the disclosed form. The structure of the spider 17 whose inner periphery is fixedly coupled to the top plate 14 of the motor / chassis and whose outer periphery is attached to the dome diaphragm 18 is an integral element of the transducer of the present invention.

  The dome shaped diaphragm or inverted conical shaped diaphragm 18 embodies the inventive feature that a diaphragm structure having a geometric configuration with height and internal cavity volume is preferred. This can embody a dome-like, inverted conical or pyramid-like diaphragm form in terms of showing its maximum height at the center of the geometrical form at a point above the voice coil former 21.

  As mentioned above, the shape of the diaphragm is not limited to a dome shape, but any other geometric form which provides a height sufficient to incorporate the magnetic motor structure between its central portion and a fixed point for the surround, For example, linear diaphragms (from surround connections to the tip of a conical shape), flat tops on a former, inverted conical geometry and other generally convex configurations may be effective.

  Also, the particular non-continuous surface diaphragm 18 configuration can also provide improved acoustic performance of the transducer. This can attenuate the mode appearing at the center of the diaphragm by increasing the stiffness of this region.

  Different materials may be applied to each part of the two-part diaphragm 18a (as shown in FIG. 3), ie the inner disc 24 of the diaphragm 18a and the outer part of the diaphragm structure 18a. The bonding between these two parts may be performed by the coupler 20. The connection between the inner disc 24 and the coupler 20 is desirably as strong as possible, while the outer disc 18a is attached using a soft or damp adhesive. This form acts as an attenuator of the vibrations transmitted to the outer disc 18a which is beneficial for the smooth peaks caused by the breaking phenomenon at high frequencies, or alternatively, the effective diaphragm diameter decreases gradually with increasing frequency at high frequencies. To form a low pass filter.

  Coupler 20 is particularly rigid in that diaphragm device 20 increases the stiffness of the central region (the extension of the piston radiation area) of the radial surface of diaphragm 18 which has a beneficial effect on the frequency response of driver 10. The acoustic and mechanical capabilities of the transducer 10 can be improved in that the coupler 20 stiffens at the high end of the operating frequency range of the diaphragm whose increase serves to control the amplitude of its vibration mode .

  The coupler 20, in addition to stiffening the central region of the radiating surface of the diaphragm 18, also strengthens the upper end of the neck of the voice coil former 21, thereby ensuring a strong and reliable connection to the diaphragm 18, Along with improving the frequency response, it provides a more powerful connection for greater mechanical power operation.

  The coupler apparatus 20 can be configured such that it has multiple connection points from the voice coil former 21 to the diaphragm 18 so that the forces provided by the voice coil 19 are balanced. Also, this form further contributes to the enhancement of the control of the vibration mode of the diaphragm 18.

  Depending on the material forming the rigid coupler 20 or the flexible coupler 30, the damping of the connection system can be varied to suit the desired properties. Therefore, the flexible coupler 30 shown as one example in FIG. 17 can operate as a low pass filter, as a damper, or as a resonant system.

  Also, a ring or frusto-conical shaped part having an L-shaped cross section for joining the voice coil former 21 to the surface of the diaphragm 18 allows the use of the surface of the continuous diaphragm 18 and is usually accompanied by the coupler 20. Rather, the structurally more fragile butt joint formed by connecting only the voice coil former 21 directly to the diaphragm 18 is avoided.

  Also, one of the possible diaphragm geometries which fulfill the aforementioned requirements is to accommodate the magnetic motor structure of the loudspeaker and its body edge is bent upwards to form an outer conical second one. It also includes an emitting surface that is formed to form a first dome shaped geometry (18) that forms geometry (18e) (FIG. 19). The second geometry body meets the surround (16) at the end of the structure. The outer cone can be formed from the same part as the central dome, or it can be a second separate part attached or coupled to the first geometry, the inner diameter of which is the central It is substantially larger than the magnetic motor structure housed by the dome. The outer periphery of the spider suspension 17 below and in the fold point or fold area or groove point or groove area of this dual geometry diaphragm structure (where the two geometrical forms "meet" each other) Are connected or coupled (unlike the rest of the embodiment, the spider element is not attached at or near the end of the radiating surface body). This folded dome serves to address the disadvantage of having a dynamic coil loudspeaker with a relatively large thin sided dome diaphragm whose stiffness is similar to that given by the flat geometry.

  The groove area or fold area improves the behavior of the loudspeaker in the breakdown frequency area by adding either a reinforcing or damping element such as a specific type of adhesive on the groove surface (34) Can be processed. Placing / attaching a reinforcing or damping element, such as an adhesive or a rubber mass, to the back of the second geometry (35) with the same purpose (controlling the smoothness of the sound pressure level curve) In this case, the quantity and position of those elements depend on the desired effect on the performance of the driver, which serves to destroy the vibration modes of the diaphragm at a particular frequency, so that their energy Distribute over a wide range of audible spectrum.

  A plastic ring or brushing (33) is arranged as a coupling element between the magnetic motor structure and the basket. This element provides a mating envelope of the motor which holds the motor rigidly in place and connects the motor to the basket.

  The manufacturing method can center voice coil former 21 within the gap by utilizing fasteners that are removed from the front of the transducer once spider 17 and conical diaphragm 18 are properly adhered to the basket and former. This method takes advantage of the central hole 28 (shown in FIG. 12A) of the geometric form of the conical conical diaphragm 18c to access the fixture. Closing the hole 28, covering the voice coil former 21 or assembling the dust cup 24 a on the voice coil former 21 completes the process.

As another preferred method of construction, the fixture which positions the voice coil in its predetermined position must be removed from the back of the transducer. This is because the dome diaphragm has no opening for accessing the centering device. To do that, the T-yoke 12 comprises two parts: a conventional T-yoke 12 and an additional backplate 11a (shown in FIG. 1). This additional backplate 11a is arranged between the magnet structure 13 and the bottom of the conventional T-yoke 12 or the backplate 12a. Both the basket frame 11 and the motor (in this case comprising only the magnet 13 and the top plate 14) are mounted on the back plate 12b, whereby the T-yoke 12 is easily removed from the structure of the transducer 10 be able to. This operation takes place after good assembly of the diaphragm 18 and the spider 17 in the system without losing the effectiveness of the assembly or manufacturing process of the transducer 10. By removing the T-yoke 12, it is possible to access the fixture located on the pole piece 12a. When the fixture is disassembled, the T-yoke 12 is returned to its original position and glued / engaged to the back plate 12b. The proposed assembly method is described step by step as follows.
1. The back plate 12b and the T-yoke 12 are assembled (no adhesive is used).
2. Attach the magnet 13, the top plate 14 and the aluminum ring (continuously) to the back plate.
3. The basket frame 11 and the back plate 12b are attached to each other using an adhesive, screws, or both.
4. The inner circumference of the spider 17 is fixed on the aluminum ring.
5. Attach the couplers 20 (protruded parts) to the former using a flat surface and align the top portions of these elements (if the coupler is formed from two parts, the process does not change, the former The second part of the coupler 20, which looks like a dust cup approaching (a) is attached after the first element).
6. The fixture is placed on the pole piece 12a, and the voice coil 19 is set in its motor gap in its optimal arrangement.
7. The voice coil former 19 is fitted into the fixture between the top plate 14 and the pole piece 12a.
8. The dome diaphragm 18 is attached to the voice coil former 21 using the coupler 20.
9. Bond the lead wires to the surround under the dome.
10. The dome diaphragm 18 is secured to the spider 17 and the basket 11.
11. While removing the T-yoke 12 from the structure, the fixture is removed from the pole piece 12a.
12. With the T-yoke 12 in its original position, fix the T-yoke at that position.

  Similar to the ferrite magnet version as shown in FIG. 1, this method applied to the neodymium magnet version (shown in FIG. 9) removes the fastener from the back of the transducer 10 in the last step of assembly means. The structure of the basket / frame 11 of the present invention facilitates the removal of the motor (U-yoke 12c, neodymium magnet 13, and top plate 14a) which allows access to the fixture. None of the moving parts are attached directly to the magnetic motor, but instead the moving parts are attached to the basket. In this version there is no aluminum ring.

  It is obvious that those skilled in the art may now make use of numerous of the specific devices and techniques disclosed herein without departing from the inventive concept. It is. As a result, the invention should be construed to encompass any and all novel features disclosed herein and novel combinations of these features, as well as the invention disclosed herein. Is an illustration of the scope of the present invention and is not intended to limit the scope of the present invention.

  Finally, the language used herein has been selected primarily for readability and instructional purposes and not to delineate or limit the subject matter of the invention. It should be noted that there are cases. Accordingly, the disclosure of the present invention is illustrative of the scope of the present invention and is not intended to limit the scope of the present invention.

10a, 10b, 10c, 10d, 10e, 10f, 10h, 10i, 10j, 10k, 10l, 10m, 10n, 10o, 10p, 10q Low-profile loudspeaker converter 11 Frame 12 T yoke 12a, 12b Back plate 13, 13a, 13c Magnet structure 14 Top plate 15 Input terminal 16, 16a Surround suspension 16b Rib 17 Spider suspension 17a, 17b Dual spider suspension 18, 18a Diaphragm 18c Outer diameter 18d Side 19 Speech coil 20, 20a, 20b, 20c, 20d coupler Reference Signs List 21 voice coil former 22 ventilation pole piece opening 24, 24a, 24b, 24c, 24d dust cap 25 ring separator 28 center notch opening 29 flexible coupler 30 flexible side wall 31 Ida suspension 32 coupling rod 33 plastic ring or brushing 34 groove surface 35 second geometry

Claims (9)

A low-profile loudspeaker converter,
With a magnet,
A top plate disposed on the magnet;
A voice coil former having a first end terminating above the top plate;
A diaphragm extending over the top plate;
A coupler connecting the diaphragm to the first end of the voice coil former;
A first suspension disposed below the diaphragm and having one end attached to the diaphragm and a second end attached to the top plate;
A second suspension extending from the outer edge of the diaphragm to the frame of the thin loudspeaker transducer;
Equipped with
The first suspension comprises a spider suspension having a corrugated cross-sectional shape, the second end of the spider suspension being attached to a ring separator mounted on the top plate, the ring separator being the top plate thin loudspeaker transducer Ru extending around the voice coil former above.   The low-profile loudspeaker transducer according to claim 1, wherein the magnet and the top plate form a magnetic motor disposed at least partially in a volume formed by the diaphragm. The diaphragm extends over the voice coil former, or
The diaphragm terminates at the first end of the voice coil former, and the thin loudspeaker transducer further comprises a top cover extending from an edge of the diaphragm and extending over the voice coil former. Low-profile loudspeaker converter according to 1. The first suspension comprises two of the spider suspensions, one of the spider suspensions being disposed on the other of the spider suspensions, the second ends of both of the spider suspensions being attached to the ring separator The thin loudspeaker converter of claim 3 .   The low-profile loudspeaker transducer according to claim 1, wherein the second suspension is a surround suspension having a concave cross-sectional shape and disposed below the first suspension.   The low-profile loudspeaker transducer according to claim 1, wherein the second suspension is a surround suspension having a convex cross-sectional shape and disposed above the first suspension.   The coupler includes a coupling surface at one end that is attached to the voice coil former and configured to be attached to the diaphragm at the opposite end, the coupling surface of the coupler being by the voice coil former The low-profile loudspeaker transducer according to claim 1, which is larger than the coupling surface provided. 8. The low-profile loudspeaker transducer of claim 7 , wherein the coupler comprises a top cap extending over the voice coil former, the top cap serving as a coupling surface for attaching the diaphragm to the coupler. .   The low-profile loudspeaker transducer according to claim 1, wherein the diaphragm has a cross-sectional shape that is a cone, a truncated cone, a curve, a straight line, a triangle, or a combination thereof.

Images