JP2015084522A - Thin loudspeaker converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker converter that can be built in an audio product of smaller or thinner form, while achieving a desired acoustic output and high fidelity.SOLUTION: A thin loudspeaker converter 10a includes a frame 11, which is coupled with a T yoke 12 to form a ventilation pole piece opening 22. A diaphragm 18 has a convex dome in the frame 11 via a surround suspension 16, coupled with a voice coil former 21 via a coupler 20, and the coupler 20 is connected between the diaphragm 18 and voice coil former 21. The diaphragm 18 is attached to a spider suspension 17 that is attached to a top plate 14 and also suspended by the spider suspension 17, and arranged in a plane above the surround suspension 16, so as to attain the stability for minimizing the oscillation of a voice coil 19.

Description

Cross-reference of related applications

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

  The present invention is in the category of electroacoustic transducers, and more specifically, the present invention is in the category of transducers utilized in loudspeaker systems.

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

  The modern consumer electronics market is all packaged in a compact structure with more and more functions (eg, wireless connection chipset; larger user interface; audio signal processing module; amplification; rechargeable battery, etc.) What is needed is a loudspeaker that is integrated into a manufactured audio product. These constraints generally result in an increase in the size of the associated electronics and a decrease in the size of the package size dedicated to the loudspeaker housing volume. There are also many other applications in which a cabinet structure without depth is incorporated, such as a cabinet structure in a very thin television screen where a significant reduction in effective cabinet depth and volume can compromise the performance of the transducer. .

  Miniature transducers are generally selected as a solution for such systems. This is because these transducers require a smaller acoustic volume than conventional size speakers. Nevertheless, the miniature transducer has low efficiency and limited output when reproducing low frequencies at high levels as a result of impaired parameters including limited diaphragm surface area and volume displacement. Is well known to give.

  There is a need for improved transducers 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 diaphragm surface area and displacement of conventional size transducers while significantly reducing the transducer height profile. In a preferred embodiment, the low-profile loudspeaker transducer incorporates an inverse relationship between the surround suspension and the spider suspension, where the spider suspension is positioned above the surround suspension and housed within the volume of the protruding dome diaphragm or the reverse diaphragm. However, it allows for a structure without further depth while maintaining the stability of the voice coil in the voice coil gap during diaphragm excursion and reducing the swing 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 forms and advantages will become apparent from the specification disclosed hereinafter.

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

It is a cutaway view of a first example of a loudspeaker converter of the present invention. It is sectional drawing of the other example of the loudspeaker converter of this invention. It is an expanded cutaway view of the 1st example of the loudspeaker converter of this invention. It is a cutaway view of a second example of the loudspeaker converter of the present invention. It is an expanded cutaway view of the 2nd example of the loudspeaker converter of this invention. It is a cutaway view of a third example of the loudspeaker converter of the present invention. It is an expanded cutaway view of the 3rd example of the loudspeaker converter of this invention. It is a cutaway view of the 4th example of the loudspeaker converter of the present invention. It is a cutaway view of a fifth example of the loudspeaker converter of the present invention. It is an expanded cutaway view of the 5th example of the loudspeaker converter of this invention. It is a cutaway view of a sixth example of the loudspeaker converter of the present invention. It is an expanded cutaway figure of the 6th example of the loudspeaker converter of this invention. It is a cutaway view of a seventh example of the loudspeaker converter of the present invention. It is an expanded cutaway view of the 7th example of the loudspeaker converter of this invention. It is a cutaway view of an eighth example of the loudspeaker converter of the present invention. It is a cutaway view of a ninth example of the loudspeaker converter of the present invention. It is an expanded cutaway view of the 9th example of the loudspeaker converter of this invention. It is a cutaway view of a tenth example of the loudspeaker converter of the present invention. It is sectional drawing of the 11th example of the loudspeaker converter of this invention. It is a figure of the diaphragm component of the 11th example of the loudspeaker converter of this invention. It is sectional drawing of the 12th example of the loudspeaker converter of this invention. It is sectional drawing of the 13th example of the loudspeaker converter of this invention. It is sectional drawing of the 14th example of the loudspeaker converter of this invention. It is sectional drawing of the 15th example of the loudspeaker converter of this invention. It is sectional drawing of the 16th example of the loudspeaker converter of this invention. It is sectional drawing of the 17th example of the loudspeaker converter of this invention. It is a cutaway view of the 18th example of the loudspeaker converter of this 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 is considered to be system packaging properties, desired frequency response, output capability, and / or desirable. Many forms may be formed depending on factors such as the level of linearity to be achieved. The target price of a particular magnetic transducer of the present invention is also a factor associated with increased frequency response, maximum power capability, and linearity generally associated with increased cost.

  Accordingly, in the following, a number of different examples of the invention will be described. In the following discussion, elements that are common 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 thin 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 ferrous material, in this example shown to form a vent pole piece opening 22. It is. This and other embodiments may be configured with or without a vent opening in the Y yoke. A connecting spacer 11a may be used as an intermediate coupling plate that forms the 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. 1B with one ring magnet and may be made of ceramic or ferrite material, but any of a wide variety of magnet materials commonly utilized in the field of loudspeaker transducers May be incorporated.

  Preferably, an iron top plate 14 is coupled to the upper end of a magnet structure 13 that forms a magnetic circuit, preferably with an iron T-yoke 12 and a back plate 12a. In this embodiment of FIGS. 1A and 1B, the diaphragm 18 is a seamless convex shape that is connected to the frame 11 via a flexible surround suspension 16 in a concave or convex configuration (reverse configuration and non-reverse configuration, respectively). Shown as a dome. The present invention does not limit the surround shape in this way, and can consider any surround form traditionally implemented with an acoustic transducer such as a multi-roll surround form, a double surround form, or a 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. Further 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 cross-sectional shape with a convex or concave curve 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 a linear aspect and a curved aspect. 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 shape 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 in a 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 attached to a spider suspension 17 attached to the top plate 14 and is also suspended by the spider suspension 17. The diaphragm 18 minimizes the swing of the voice coil 19 during the dynamic displacement of the diaphragm 18. In order to give stability to the diaphragm 18 to be limited, it is arranged in a plane above the surround suspension 16. FIG. 1B shows a ring separator 25 that connects the inner periphery of the spider suspension 17 to the top plate 14. This ring separator serves to control the spider suspension anchor point for both the diaphragm 18 and the magnetic motor structure. In the exemplary embodiment shown, the ring separator 25 is disposed on the top plate 14 and extends in a ring around the voice coil former 21 and the conductive voice coil 19. The ring separator has a substantially 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 that forms a curvilinear manner and / or a linear manner. The ring separator 25 may extend on the top plate 14 in an annular form as shown, or in any other desired geometric form, such as a pentagon, hexagon, ellipse, diamond shape. Good.

  The input terminal 15 is adapted to receive an audio input signal, and a conductive wiring (not shown) connects the input terminal 15 to the audio coil 19.

  FIG. 2 is an enlarged cut-away view of the same basic apparatus of FIG. 1 showing an enlarged example of the coupler 20 in detail and how the coupler connects to the voice coil former 21. For illustrative purposes, the diaphragm 18 is spaced from the coupler 20. When the coupler 20 has a larger surface area than the top of the voice coil former 21, so that when coupled to the diaphragm, the coupler 20 has greater diaphragm / coupler integrity, less diaphragm breakdown, and greater bandwidth. 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 directly connected to the diaphragm 21 or can be coupled via a flexible or damping interface material. The coupler 20 may have different regular or irregular geometric shapes with respect to the outer edge thereof, and cannot be formed in a simple circle, but may have a pentagonal shape, a hexagonal shape, or the like.

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

  FIG. 4 shows a cutaway view depicting a third example thin loudspeaker transducer device 10c, and FIG. 4A shows an enlarged view. The third example 10c is substantially the same as the apparatus of FIG. 1, but the surround suspension 16a is shown as a non-reverse convex configuration. Throughout various examples, reverse concave surround suspensions and non-reverse convex surround suspensions may be used interchangeably. The device 10c is optimized for use as a woofer or subwoofer application for reproducing low frequencies that may require greater deflection of the diaphragm 18, so that it attaches to the outer portion of the diaphragm 18 and the top plate 14. By applying the dual spider suspensions 17a and 17b attached to the ring separator 25, a larger linear deviation can be realized. 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 a spider suspension 17a mounted on the upper side of the separator 25 and the other suspension 17b 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 suspensions 17a, 17b act as a more stable centering device, thereby maintaining the position of the voice coil 19 and rubbing the voice coil against the top plate 14 during large signal low frequency excursions. Do not leave.

  FIG. 5 shows a cutaway view depicting a fourth example thin loudspeaker transducer device 10d. The fourth example 10d is substantially the same as the apparatus of FIG. 1, but the surround suspension 16a is shown as a non-inverted convex form, and the magnet structure 13 includes two ring magnets 13a and 13b, in which case The ring magnet 13b has a larger outer diameter, a larger amount of magnet material, and a larger magnetic energy so 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 spider suspension 17 with respect to the top plate 14 and upper magnet 13b.

  FIG. 6 shows a cutaway view 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 geometry, and the diaphragm 18b is a surround suspension 16a relative to the diaphragm 18b. And has an extended outer diameter 18c extending beyond the attachment point. In addition, the loudspeaker converter 10e advantageously uses a diaphragm extension portion having a larger diameter by disposing the attachment portion of the stabilizing spider suspension 17c to the diaphragm extension portion 18c below the attachment portion 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, in approximately 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 arranged well below the surround suspension 16 and even at the bottom of the converter behind the back plate 12b.

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

  FIG. 8 shows a cutaway view depicting a seventh example thin loudspeaker transducer device 10g, and FIG. 8A shows an enlarged view. The seventh example 10g is similar to the device of FIG. 6, but is configured as a thin coaxial converter in which a high frequency tweeter converter 27 is mounted in a notch in the opening 28 of the diaphragm 18a. The tweeter 27 may be mounted on the T yoke 12 in the ventilation pole piece opening 22 so as to be separated 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 view depicting an eighth example thin loudspeaker transducer device 10h. The eighth example 10h is similar to the apparatus 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 satisfactorily receive the magnet structure 13 c, the U yoke structure 12 c is disposed outside the magnet structure 13 c and the voice coil former 21, and the top plate 14 a 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 a ventilation opening 22a between the U yoke 12c and the magnet structure 13c. Alternatively, the magnet structure 13c of the embodiment 10h may be composed of one or more disk magnets without a hole at the center.

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

  FIG. 11 shows an enlarged view depicting a tenth example thin loudspeaker transducer 10j similar to the device of FIG. 10, but the coupler 20c is fitted over the top of the voice coil former 21 and the diaphragm 18 is fitted. A top cup that attaches 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 frustoconical inverted convex conical structure 18c (shown in FIG. 12A) having an upper central opening 28 and has the same basic structure as the basic structure of FIG. Sectional drawing which draws the thin loudspeaker converter 10k of the 11th example is shown. The diaphragm 18 c is connected to the coupler 20, and a 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 is somewhat curved in a convex or concave configuration.

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

  FIG. 14 is a cross-sectional view illustrating a thirteenth example thin loudspeaker converter 10m having the same basic structure as that of FIG. 13, in which the concave dust cap 24b and the diaphragm 18b of FIG. The inverted conical diaphragm is replaced by a conical diaphragm, and 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 18b attached to the coupler 20.

  15 is replaced by a rounded convex dust cap 24c of FIG. 13 in which the concave dust cap 24c having the straight surface of FIG. 13 is attached to one or both of the voice coil former 21 and the diaphragm 18b. Sectional drawing which draws the thin loudspeaker converter 10n of the 14th example of the same basic structure as the basic structure is shown. The diaphragm 18b 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 The voice coil former 21 and the coupler 20 may be attached.

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

  FIG. 17 is a sixteenth embodiment similar to the embodiment of FIG. 12, except that the standard coupler 20 of FIG. 12 is replaced with a flexible coupler 29 attached to the upper end dust cap 24a and the voice coil former 21. Sectional drawing which draws the thin loudspeaker converter 10p of the example of is shown. The dust cap 24a is attached to the diaphragm 18b. The flexible coupler 29 can be configured as an open structure with flexible sidewalls 30 or can be a closed / sealed structure with air contained within the flexible coupler 29 for additional rigidity. Also, resistance loss 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 where 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 thin loudspeaker transducer 10q that is the same as the apparatus of FIG. 2 with the addition of a rear suspension 31, with the rear suspension 31 under the back plate 12b. At the same time, the rear suspension 31 is attached to a coupling rod 32 that protrudes through the opening 22 of the t-yoke and couples the rear suspension 31 to the diaphragm 18. In this case, the rear suspension 31 Add additional stability to minimize rocking or twisting. In another embodiment, a coupling structure that replaces 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 technique with a small-diameter magnet structure. 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 a number of materials including a wide variety of materials known in the art for aluminum, woven titanium, paper pulp, and loudspeaker transducer materials.

  In various disclosed embodiments, the present invention utilizes the space provided by the geometry of the protruding dome diaphragm or the inverted conical diaphragm 18 to move the magnet structure 13 into the concave inner cavity of the diaphragm 18. Pull up, thereby reducing the overall height of the transducer. Due to the short distance requirement between the diaphragm and the motor, the spider 17 is configured in the disclosed form. The structure of the spider 17 whose inner periphery is fixedly coupled to the motor / chassis top plate 14 and whose outer periphery is attached to the dome diaphragm 18 is an indispensable element in the converter of the present invention.

  The dome-shaped diaphragm or the inverted conical diaphragm 18 embodies the features of the present invention that a diaphragm structure having a geometry with height and internal cavity volume is preferred. From the viewpoint of showing the maximum height at the center of the geometrical form at a certain point above the voice coil former 21, a dome-shaped, inverted conical or pyramidal diaphragm form can be realized.

  As previously mentioned, the shape of the diaphragm is not limited to a dome shape, but any other geometric form that provides sufficient height between its center and a fixed point relative to the surround to capture the magnetic motor structure, For example, a straight diaphragm (from the surround connection to the conical tip), a flat top on the former, an inverted conical geometry, and other generally convex configurations may be useful.

  The particular discontinuous surface diaphragm 18 configuration can also result in 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 disk 24 of the diaphragm 18a and the outer part of the diaphragm structure 18a. The joining between these two parts can be made by the coupler 20. The connection between the inner disk 24 and the coupler 20 is preferably as strong as possible, while the outer disk 18a is attached using a soft or vibration-damping adhesive. This configuration acts as an attenuator for vibrations transmitted to the outer disk 18a that are beneficial for smooth peaks caused by the breakdown phenomenon at high frequencies, or, alternatively, the effective diaphragm diameter gradually decreases with increasing frequency at high frequencies. A low pass filter can be formed.

  The coupler 20 is particularly advantageous in that the rigidity of the diaphragm 18 is increased in that the coupler device 20 increases the rigidity of the central area of the radiating surface of the diaphragm 18 (an extension of the piston radiating area), which has a beneficial effect on the frequency response of the driver 10. The acoustic and mechanical capabilities of the transducer 10 can be improved in that the coupler 20 increases rigidity at the high end of the diaphragm's operating frequency range where the increase helps to control the amplitude of its vibration mode. .

  In addition to increasing the rigidity of the central region of the radiation surface of the diaphragm 18, the coupler 20 also strengthens the upper end of the neck portion of the voice coil former 21, thereby ensuring a strong and reliable connection to the diaphragm 18, Improves frequency response and provides a stronger connection for greater mechanical force manipulation.

  The coupler device 20 can be configured such that it has a plurality of connection points from the voice coil former 21 to the diaphragm 18, thereby balancing the forces provided by the voice coil 19. In addition, this configuration further contributes to strengthening control of the vibration mode of the diaphragm 18.

  Depending on the material forming the hard coupler 20 or flexible coupler 30, the damping of the connection system can be changed to suit the desired characteristics. Therefore, the flexible coupler 30 shown as an example in FIG. 17 can operate as a low-pass filter, a damper, or a resonance system.

  Also, a ring or small cone 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 a coupler 20. The structurally more fragile butt joint formed by connecting only the voice coil former 21 directly to the diaphragm 18 is avoided.

  One of the possible diaphragm geometries that meet the aforementioned requirements also accommodates the speaker's magnetic motor structure and its body edge is folded upwards to form an outer conical second. Also included is a radiating surface formed to form a first dome-shaped geometry (18) that forms the 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 to or coupled to the first geometry, the inner diameter of which is It is substantially larger than the magnetic motor structure housed by the dome. Below this double geometric form diaphragm structure and at the fold point or fold area or groove point or groove area or near it (where the two geometries "see" each other), the outer circumference of the spider suspension 17 Are connected or coupled (unlike the rest of the embodiment, the spider element is not attached to or near the end of the emitting surface body). This folded dome helps to address the disadvantage of having a dynamic coil loudspeaker with a relatively large thin dome diaphragm whose stiffness is similar to that provided by the flat geometry.

  The groove region or fold region is intended to improve the loudspeaker behavior in the breakdown frequency region by adding either a reinforcing element or damping element, such as a specific type of adhesive, on the groove surface (34). Can be processed. With the same purpose (controlling the smoothness of the sound pressure level curve), a reinforcing or damping element such as an adhesive or a rubber mass can be placed / attached to the back of the second geometry (35) In this case, the amount and position of these elements depends on the desired effect on the driver's performance, which helps to destroy the diaphragm vibration mode at a certain frequency, and thus to reduce their energy Distribute over a wide area of the 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 for the motor that holds the motor firmly in place and connects the motor to the basket.

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

In another preferred configuration, the fixture that positions the voice coil in its predetermined configuration 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 so, the T-yoke 12 comprises two parts: a regular T-yoke 12 and an additional back plate 11a (shown in FIG. 1). This additional back plate 11a is disposed between the magnet structure 13 and the bottom of the normal T yoke 12 or the back plate 12a. Both the basket frame 11 and the motor (in this case only including the magnet 13 and the top plate 14) are placed on the back plate 12b, so that the T-yoke 12 is easily removed from the structure of the converter 10. be able to. This operation is performed after successful assembly of diaphragm 18 and spider 17 in the system without compromising the effectiveness of the assembly or manufacturing process of transducer 10. By removing the T-yoke 12, the fixtures disposed on the pole piece 12a can be accessed. When the fixture is disassembled, the T yoke 12 is returned to its original position and bonded / screwed onto 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 (adhesive is not used).
2. Magnet (13), top plate (14), and aluminum ring are (continuously) attached to the back plate.
3. The basket frame 11 and the back plate 12b are attached to each other using adhesives, screws, or both.
4). The inner periphery of the spider 17 is fixed on the aluminum ring.
5. A flat surface is used to attach the coupler 20 (protruding part) to the former and align the upper ends of these elements (if the coupler is formed from two parts, the process remains unchanged and the former A second part of the coupler 20 that looks like a dust cup approaching is attached after the first element).
6). The fixing tool is placed on the magnetic pole piece 12a, and the voice coil 19 is set in the motor gap in the optimal arrangement.
7). The voice coil former 19 is fitted into the fixture between the top plate 14 and the magnetic pole piece 12a.
8). The dome diaphragm 18 is attached to the voice coil former 21 using the coupler 20.
9. Glue the lead wire to the surround under the dome.
10. The dome diaphragm 18 is fixed to the spider 17 and the basket 11.
11. The T yoke 12 is removed from the structure and the fixture is removed from the pole piece 12a.
12 The T yoke 12 is placed at its original position, and the T yoke is fixed 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 fixture from the back of the transducer 10 in the last step of assembly. means. The basket / frame 11 structure of the present invention facilitates extraction of the motors (U yoke 12c, neodymium magnet 13 and top plate 14a) that allow 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 will now be apparent that those skilled in the art may use many of the specific devices and techniques disclosed herein to make departures from these devices and techniques without departing from the inventive concept. It is. As a result, the present invention should be construed to include any and all novel features disclosed herein and novel combinations of these features, and the present invention disclosed herein. These examples are illustrative of the scope of the present invention and are not intended to limit the scope of the invention.

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

10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j, 10k, 10l, 10m, 10n, 10o, 10p, 10q Thin 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 Voice coil 20, 20a, 20b, 20c, 20d Coupler 21 Voice coil former 22 Venting pole piece openings 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 (10)

A thin loudspeaker converter,
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 an outer edge of the diaphragm to a frame of the thin loudspeaker transducer;
A thin loudspeaker converter comprising:   The thin loudspeaker transducer of claim 1, wherein the magnet and the top plate form a magnetic motor that is at least partially disposed within a volume formed by a 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. 2. The thin loudspeaker converter according to 1.   The first suspension includes a spider suspension having a corrugated cross-sectional shape, a second end of the spider suspension is attached to a ring separator mounted on the top plate, and the ring separator is the top plate The thin loudspeaker transducer of claim 1, extending above the voice coil former.   The first suspension comprises two spider suspensions, one spider suspension being disposed on the other spider suspension and a second end of both spider suspensions being attached to the ring separator. Item 5. The thin loudspeaker converter according to item 4.   The thin loudspeaker converter 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 thin loudspeaker converter 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 one end attached to the voice coil former and a coupling surface configured to be attached to the diaphragm at an opposite end, wherein the coupling surface of the coupler is formed by the voice coil former. The thin loudspeaker transducer of claim 1, wherein the thin loudspeaker transducer is larger than a given coupling surface.   9. A thin loudspeaker transducer according to claim 8, 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 thin loudspeaker transducer of 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.

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