PATENT DOCUMENT

Publication Number: US-9661420-B2
Application Number: US-201414463467-A
Country: US
Kind Code: B2

Title: Moving coil motor arrangement with a sound outlet for reducing magnetic particle ingress in transducers

Abstract:
An electromechanical transducer including a magnetic circuit having a magnet configured to generate a magnetic field and a magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having a primary flux component and a secondary flux component. The transducer further including a housing positioned around the magnetic circuit, the housing having an acoustic spout whose sound outlet opening is positioned outside of a portion of the magnetic field that is dominated by the primary flux component. A transducer including an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout extending from the top wall or the bottom wall, a diaphragm, a voice coil and a magnet assembly having a ring magnet and a gap within which the voice coil is positioned.

Claims:
What is claimed is: 
     
       1. An electromechanical transducer comprising:
 a magnetic circuit having a magnet configured to generate a magnetic field and an annularly shaped magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having a primary flux component and a secondary flux component; and 
 a housing positioned around the magnetic circuit, the housing having an acoustic spout that forms a sound outlet opening for outputting sound from the housing, and wherein the acoustic spout is positioned outside of a portion of the magnetic field that is dominated by the primary flux component such that a strength of the magnetic field at the acoustic spout is 10 mT to 30 mT less than a strength of the magnetic field over the magnet and the acoustic spout extends from an outer surface of the housing a distance sufficient to deflect a particle traveling in a direction that is off-axis with respect to an axis of the acoustic spout and toward the acoustic spout, away from the sound outlet opening. 
 
     
     
       2. The transducer of  claim 1  wherein the portion of the magnetic field dominated by the primary flux component has a higher magnetic flux density than a portion of the magnetic field dominated by the secondary flux component. 
     
     
       3. The transducer of  claim 1  wherein the acoustic spout is positioned within a portion of the magnetic field dominated by a radial component of the secondary flux component. 
     
     
       4. The transducer of  claim 1  wherein the magnet is a continuous ring magnet or a set of discrete magnets around an outside of the coil and the acoustic spout is positioned such that it is axially aligned with an open center of the magnet. 
     
     
       5. The transducer of  claim 1  wherein the magnet is a center magnet and the acoustic spout is positioned such that it is axially offset with respect to the center magnet. 
     
     
       6. The transducer of  claim 1  wherein the diaphragm is positioned between the acoustic spout and the magnet. 
     
     
       7. The transducer of  claim 1  wherein the magnet is positioned between the acoustic spout and the diaphragm. 
     
     
       8. The transducer of  claim 1  further comprising:
 a yoke having a base portion positioned along a bottom side or a top side of the magnet and an arm portion positioned within an open center portion of the magnet such that the annularly shaped magnetic gap is formed between the magnet and the arm portion. 
 
     
     
       9. The transducer of  claim 1  wherein the acoustic spout extends in a direction from the outer surface of the housing that is parallel to an axis of the housing. 
     
     
       10. The transducer of  claim 1  wherein the electromechanical transducer is a microspeaker. 
     
     
       11. An electromechanical transducer comprising:
 an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout extending from an outer surface of the top wall, and the acoustic spout defines an acoustic opening through the enclosure, and the acoustic opening provides the only acoustic pathway for sound outlet from the enclosure; 
 a diaphragm positioned within the enclosure; 
 a voice coil positioned along a face of the diaphragm; and 
 a magnet assembly positioned along the bottom wall of the enclosure, the magnet assembly having a ring magnet and a yoke, the yoke having a base portion positioned along a surface of the ring magnet facing the top wall of the enclosure and an arm portion that extends from the base portion into an opening of the ring magnet, and gap is formed within the opening of the ring magnet by the arm portion and a side of the ring magnet forming the opening, wherein a portion of the voice coil is positioned within the gap and the acoustic spout is positioned over the opening. 
 
     
     
       12. The transducer of  claim 11  wherein the ring magnet is positioned only around an outer surface of the voice coil. 
     
     
       13. The transducer of  claim 11  wherein the acoustic spout is positioned entirely outside of a magnetic field generated by the magnet assembly. 
     
     
       14. The transducer of  claim 11  wherein the diaphragm is positioned between the acoustic spout and the ring magnet. 
     
     
       15. The transducer of  claim 11  wherein the ring magnet is positioned between the acoustic spout and the diaphragm. 
     
     
       16. The transducer of  claim 11  wherein the acoustic spout comprises a z-height dimension operable to control particle ingress into the enclosure. 
     
     
       17. The transducer of  claim 11  wherein a strength of the magnetic field at the acoustic spout is 10 mT to 30 mT less than a strength of a magnetic filed over the ring magnet. 
     
     
       18. An electromechanical transducer comprising:
 an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout; 
 a diaphragm positioned within the enclosure; 
 a voice coil positioned along a face of the diaphragm; and 
 a magnet assembly positioned on the bottom wall and forming a gap within which a portion of the voice coil is positioned, the magnet assembly having a magnet and a frame positioned along a side of the magnet, and wherein the frame is positioned on the bottom wall a distance from the at least one sidewall such that a space is formed between the frame and the at least one side wall, the acoustic spout extends from the top wall and is between the frame and the at least one sidewall such that an acoustic pathway formed by the acoustic spout is aligned with the space formed between the frame and the at least one sidewall, and wherein at least one wall of the acoustic spout is within a same plane as the at least one sidewall and the acoustic pathway is perpendicular to a surface of the top wall. 
 
     
     
       19. The transducer of  claim 18  wherein the magnet comprises a center magnet void of any openings.

Description:
FIELD 
     An embodiment of the invention is directed to a magnetic motor structure arranged with respect to a sound outlet to reduce magnetic particle ingress within the transducer. Other embodiments are also described and claimed. 
     BACKGROUND 
     In modern consumer electronics, audio capability is playing an increasingly larger role as improvements in digital audio signal processing and audio content delivery continue to happen. In this aspect, there is a wide range of consumer electronics devices that can benefit from improved audio performance. For instance, smart phones include, for example, electro-acoustic transducers such as speakerphone loudspeakers and earpiece receivers that can benefit from improved audio performance. Smart phones, however, do not have sufficient space to house much larger high fidelity sound output devices. This is also true for some portable personal computers such as laptop, notebook, and tablet computers, and, to a lesser extent, desktop personal computers with built-in speakers. Many of these devices use what are commonly referred to as “microspeakers.” Microspeakers are a miniaturized version of a loudspeaker which use a moving coil motor to drive sound output. In compact designs such as smart phones, the moving coil motor, which may be interpreted as including a diaphragm, a voice coil and a magnet assembly, is positioned in close proximity to the device sound output port. Such close proximity, however, may leave the moving coil motor, and its components, vulnerable to damage and/or acoustic distortion due to magnetic particle ingress through the sound output port if the product is exposed to a hostile environment which contains ferritic dust or other small ferrous particles. 
     SUMMARY 
     An embodiment of the invention is directed to a magnetic motor structure for a transducer arranged with respect to a sound outlet port such that the orientation of the magnetic field at, or near, the sound outlet (which may be a path for particle ingress) is opposed to the ingress direction in comparison to a transducer without the arrangement disclosed herein. In one embodiment, the invention is directed to an electromechanical transducer including a magnetic circuit having a magnet configured to generate a magnetic field and a magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having circulating magnetic flux lines that may include a primary flux component and a secondary flux component. The primary flux component drives movement of the voice coil while the secondary flux component is a stray component of the primary component. At some spatial locations, the magnetic flux lines are dominated by a component (e.g. flux lines) aligned with the outlet axis (axially aligned) and at others dominated by a component (e.g. flux lines) perpendicular to the outlet axis (e.g. radially aligned). The transducer further includes a housing positioned around the magnetic circuit, the housing having an acoustic spout extending outward so that its sound outlet opening (or port) is positioned outside of a portion of the magnetic field dominated by the primary flux component, so that the chance of particle (e.g. metallic or magnetic particle) ingress through the sound outlet opening is reduced. 
     Another embodiment of the invention is directed to an electromechanical transducer including an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout formed along one of the top wall, the bottom wall and the at least one side wall. A diaphragm is positioned within the enclosure. A voice coil is positioned along a face of the diaphragm. The transducer further includes a magnet assembly having a ring magnet and a yoke that form a gap within an opening of the ring magnet in which magnetic flux is concentrated, and a portion of the voice coil is positioned within the gap and the acoustic spout is positioned over the opening. 
     Another embodiment of the invention is directed to an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout extending from the top wall. A diaphragm is positioned within the enclosure. A voice coil is positioned along a face of the diaphragm. A magnet assembly is also positioned within the enclosure and forms a gap within which a portion of the voice coil is positioned. The acoustic spout extends from a portion of the top wall that is between the magnet assembly and at least one sidewall such that it is outside of a portion of the magnetic field dominated by the axially aligned magnetic flux lines. 
     The above summary does not include an exhaustive list of all aspects of the present invention. It is contemplated that the invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those disclosed in the Detailed Description below and particularly pointed out in the claims filed with the application. Such combinations have particular advantages not specifically recited in the above summary. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and they mean at least one. 
         FIG. 1A  illustrates a cross-sectional side view of one embodiment of a magnetic motor arrangement in a transducer. 
         FIG. 1B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 1A . 
         FIG. 2A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. 
         FIG. 2B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 2A . 
         FIG. 3A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. 
         FIG. 3B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 3A . 
         FIG. 4A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. 
         FIG. 4B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 4A . 
         FIG. 5  illustrates one embodiment of a simplified schematic view of one embodiment of an electronic device in which an embodiment of the invention may be implemented. 
         FIG. 6  illustrates a block diagram of some of the constituent components of an embodiment of an electronic device in which an embodiment of the invention may be implemented. 
     
    
    
     DETAILED DESCRIPTION 
     In this section we shall explain several preferred embodiments of this invention with reference to the appended drawings. Whenever the shapes, relative positions and other aspects of the parts described in the embodiments are not clearly defined, the scope of the invention is not limited only to the parts shown, which are meant merely for the purpose of illustration. Also, while numerous details are set forth, it is understood that some embodiments of the invention may be practiced without these details. In other instances, well-known structures and techniques have not been shown in detail so as not to obscure the understanding of this description. 
       FIG. 1A  illustrates a cross-sectional side view of one embodiment of a magnetic motor arrangement in a transducer. Transducer  100  may be, for example, an electro-acoustic transducer that converts electrical signals into audible signals that can be output from a device within which transducer  100  is integrated. For example, transducer  100  may be a microspeaker such as a speakerphone speaker or an earpiece receiver found within a smart phone, or other similar compact electronic device such as a laptop, notebook, or tablet computer. Transducer  100  may be enclosed within a housing or enclosure  102  having a top wall  104 , a bottom wall  106  and one or more sidewalls  108  connecting top wall  104  to bottom wall  106 . Enclosure  102  may further include an acoustic spout  112  extending outward from one of top wall  104 , bottom wall  106  or sidewalls  108 . Acoustic spout  112  defines an acoustic opening or port  110  that provides a sound outlet opening, for example a primary outlet opening, through which sound generated by transducer  100  can be output to the ambient environment. In some embodiments, the opening or port  110  formed by spout  112  provides the only pathway for sound outlet from the enclosure  102 . In addition, the enclosure may vent through small openings in bottom wall  106 . In the illustrated embodiment of  FIG. 1A , acoustic spout  112  is formed on top wall  104 , in other words, above or over a diaphragm  116  having a sound radiating surface (SRS). In this aspect, transducer  100  may be considered a front-ported device. Acoustic spout  112  may, however, be formed on another wall of enclosure  102 , for example, bottom wall  106  such that transducer  100  is considered a back or bottom-ported device. 
     In one embodiment, acoustic spout  112  may have a z-height dimension extending from an outer surface of enclosure  102 . For example, acoustic spout  112  may form a lip like projection having acoustic port  110  at its end, through which sound generated by transducer  100  can travel to the ambient environment. Spout  112  may be designed to limit the area that particles can directly ingress through acoustic port  110  and/or limit the direction that particles can ingress. In this aspect, spout  112  helps to control, or reduce, particle ingress into transducer  100 , as compared to a transducer having an opening through the wall without any sort of projection or spout  112 . For example, spout  112  may have a z-height dimension that extends far enough from the surface of the enclosure wall such that off-axis particles traveling towards acoustic spout  112  (i.e. particles traveling at an angle with respect to device axis  114 ) are blocked from entering acoustic port  110  by spout  112  and therefore ingress into enclosure  102  is reduced. In addition, because of the z-height of spout  112 , particles traveling along the top wall  104  of enclosure  102  (e.g. parallel to top wall  104 ) may be deflected up and away from acoustic port  110  by the sides of spout  112 . Further, spout  112  may contain, or be adjacent to, a particle ingress protection mesh which can impede particles that are not aligned axially with spout  112 . Spout  112 , and in turn acoustic port  110 , may in one embodiment, be formed on the top wall  104  of enclosure  102 . 
     Diaphragm  116  may be suspended from a frame  118 , which is mounted within enclosure  102  by a suspension member  120 . Diaphragm  116  may include a sound radiating surface and be any type of diaphragm or sound radiating surface capable of vibrating in response to an acoustic signal to produce acoustic or sound waves. Transducer  100  may also include a voice coil  122  positioned along a face of diaphragm  116  and within a gap  126  formed by magnet assembly  124  which serves to concentrate the flux lines to improve the motor efficiency. In one embodiment, voice coil  122  may be positioned along a bottom face of diaphragm  116  (i.e. a side of diaphragm  116  facing bottom wall  106 ) and magnet assembly  124  may, in turn, be positioned below the bottom face of diaphragm  116  (i.e. between diaphragm  116  and bottom wall  106 ). 
     Magnet assembly  124  may include a magnet  128  (e.g. a NdFeB magnet) having a top plate  160  and a yoke  130  to form a magnetic circuit for the flux generated by magnet  128 . Magnet assembly  124 , including magnet  128 , top plate  160  and yoke  130 , may be positioned below diaphragm  116 , in other words, magnet assembly  124  is positioned between diaphragm  116  and bottom wall  106 . Said another way, diaphragm  116  is between magnet assembly  124  and spout  112 . Gap  126 , within which voice coil  122  is positioned, may be formed between yoke  130  and magnet  128 . Representatively, in one embodiment, magnet  128  may be a ring magnet, such as a continuous ring magnet, having an open center portion  136  inside which the coil  122  may be positioned. Alternatively, magnet  128  may be a collection of discrete magnets arranged to form a ring around a perimeter of coil  122 . In this aspect, magnet  128  may be positioned entirely outside of coil  122  (i.e. coil  122  is entirely within the open center portion  136  of magnet  128 ). 
     Yoke  130  may include a substantially flat base portion  132  positioned along the bottom surface of magnet  128  and an arm portion  134  that extends upward from base portion  132 , e.g. perpendicular to the base portion  132  such that that yoke  130  has an “L” shaped profile as shown in  FIG. 1A  and  FIG. 1B . The arm portion  134  of yoke  130  may be positioned within open center portion  136  of magnet  128 . Gap  126  for coil  122  is formed between arm portion  134  and the inner side of magnet  128  facing arm portion  134  in order to concentrate flux lines through the coil. In this aspect, the magnetic field produced by the magnetic circuit of magnet assembly  124  can be used to drive movement of coil  122 , which in turn, vibrates diaphragm  116  in a manner sufficient to produce the desired acoustic output from transducer  100 . 
     As previously discussed, acoustic port  110 , and in turn spout  112 , provide an opening to transducer  100  through which, in some cases, ferrous particles may ingress into a housing in which transducer  100  is located. Therefore, in one aspect of the invention, acoustic spout  112  and magnet assembly  124  of transducer  100  are arranged to reduce ferrous particle ingress through acoustic port  110 . Representatively, in one embodiment, acoustic spout  112  reduces the pathway for particle ingress as compared to an acoustic port that does not include a spout as previously discussed. In addition, spout  112  is arranged with respect to magnet assembly  124  such that acoustic port  110  is outside of the magnetic field, or a portion of the magnetic field that would draw ferrous particles (e.g. iron filings), into acoustic port  110 . Such arrangement is illustrated in  FIG. 1B . 
       FIG. 1B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 1A . As can be seen from  FIG. 1B , magnet assembly  124  produces a magnetic field having magnetic field or flux lines  140  and  142  between magnet  128  and yoke  130 . As can be seen from  FIG. 1B , flux lines  140  and  142  follow a substantially elliptical path between magnet  128  and yoke  130 . In this aspect, portions of flux lines  140  and  142  can be considered aligned with a vertical axis  114  of magnet  128 , in other words they are axially aligned flux lines, while other portions can be considered aligned with a radial dimension  150  of magnet  128 , in other words they are radially aligned flux lines. In addition, flux lines  140  and  142  may be characterized as having a primary or main flux component  152 A,  154 A (illustrated in solid lines) and a secondary or stray flux component  152 B,  154 B (illustrated in dashed lines). The main flux component  152 A,  154 A is concentrated in the coil gap  126  and is designed to drive movement of coil  122 . The stray flux component  152 B,  154 B is an unintended flux which extends outside of the main flux component  152 A,  154 A, respectively. In this aspect, the main flux component  152 A,  154 A may be understood to have a higher magnetic flux density than the stray flux component  152 B,  154 B. For example, the magnetic flux density near or within the main flux component  152 A,  154 A (e.g. over magnet  128 ) may be considered to be approximately twice that near or within the stray flux component  152 B,  154 B (e.g. the opening between magnet  128 ). 
     In general, particles in the presence of the stray flux component  152 B,  154 B will align themselves with the magnetic flux lines and experience a force along these flux lines (in either a positive or negative direction) that minimizes the gap between the magnet and the particle, the magnitude of this force being a function of the magnetic flux density within the particle. This flux density is, in turn, dependent on the position of the particle in the magnetic field and on the magnetic permeability of the particle itself. Particles in closer proximity to the magnet  128 , and in turn the main flux component  152 A,  154 A will in general experience a higher attractive force toward the magnet  128 , than those in closer proximity to the stray flux component  152 B,  154 B. Because of the general field lines for a magnet (e.g. magnet  128 ), particles situated directly in front of the pole faces will be attracted to the poles with a force with the dominant component aligned along the axis of the magnet&#39;s polarization which coincides with the axis of an associated acoustic opening. However, other particles that are situated in the direction of magnet&#39;s axis but offset in a direction perpendicular to the magnet&#39;s axis will experience a force that not only includes an axial component but a significant “radial” (radial here means perpendicular to the magnet/opening axis) component. 
     Moreover, particles in such a field will not only align with the magnetic flux lines, but, because of the self-magnetization, will by magnetic attraction form high-aspect structures along the field lines. If the axial field lines align with the axis of the acoustic opening, these structures are more easily able to transverse the acoustic opening (and any associated mesh) resulting in particle ingress. However, when a radial field component of the magnetic field is present across the acoustic opening, these structures no longer align in a direction normal to the opening (and any associated mesh) and thus are not aligned in a manner such that they may easily transverse the opening (and any associated mesh). Additionally the force acting on these particles is no longer parallel to the normal direction of the acoustic opening axis, or an associated mesh. 
     Thus, in order to reduce particle ingress due to the magnetic attraction, acoustic port  110 , and in turn spout  112 , is positioned such that it is within an area of reduced magnetic flux density. In other words, spout  112  is positioned outside of the area of the magnetic field  140 ,  142  dominated by the main flux component  152 A,  154 A, respectively. Said another way, spout  112  is positioned such that it is not aligned with the purely downward magnetic pull created over magnet  128  by the main flux component  152 A,  154 A. In other words, acoustic port  110 , and in turn spout  112 , is positioned over the opening  136  of magnet  128  such that it is not directly above magnet  128 . Representatively, spout  112  may be positioned entirely outside of the magnetic field such that the strength of the magnetic field associated with the flux lines at or near spout  112  is significantly reduced (as compared to a spout positioned within the magnetic field), or spout  112  may be within the magnetic field, but outside of the area over magnet  128  (i.e. the area of highest flux density) such that the magnetic flux density (also referred to as the magnetic field strength) near spout  112  is reduced. For example, the magnetic flux density at the spout  112  may be reduced by about 10 mT, 20 mT, or 30 mT, as compared to a strength of the magnetic field not at or near spout  112  (e.g. directly over magnet  128 ). Thus, in some embodiments, spout  112  is positioned directly above an open center portion  136  of magnet  128  such that it is outside of an area of the magnetic field with the highest magnitude of flux density, particularly an axial component of the main flux component  152 A,  154 A. Said another way, spout  112  may be axially aligned with the center opening  136  of magnet  128 . For example, spout  112  may be aligned with axis  114 , or slightly offset with respect to axis  114 , while still remaining over the open center portion  136  of magnet  128 . It has been found that the spout  112  configuration and spout arrangement with respect to magnet assembly  124  as disclosed herein work synergistically to provide several advantages including, but not limited to, (1) limiting the area that particles can directly ingress, (2) limiting the direction that particles can ingress, and (3) reducing particle ingress due to the magnetic field. 
     In addition, it has been found that positioning spout  112  within the radially aligned flux lines (i.e. lines aligned with the radial dimension or axis  150 ), or a region of the magnetic field dominated by the radial flux lines (i.e. more radial flux lines than axial flux lines) may actually further reduce metallic or magnetic particle ingress through spout  112  because, for example, the radial flux lines may induce magnetic clumping and align and pull the particles across spout  112  rather than into spout  112 . 
       FIG. 2A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. Transducer  200  may be similar to transducer  100 , for example, an electro-acoustic transducer that converts electrical signals into audible signals that can be output from a device within which transducer  200  is integrated. For example, transducer  200  may be a microspeaker such as a speakerphone speaker or an earpiece receiver found within a smart phone, or other similar relatively compact electronic device such as a laptop, notebook, or tablet computer. Transducer  200  may be enclosed within a housing or enclosure  202  having a top wall  204 , a bottom wall  206  and one or more sidewalls  208  connecting top wall  204  to bottom wall  206 . Enclosure  202  may further include an acoustic spout  212  formed through one of top wall  204 , bottom wall  206  or sidewalls  208 . Acoustic spout  212  defines an acoustic port  210  that provides a sound outlet port through which sound generated by transducer  200  can be output to the ambient environment. In the illustrated embodiment of  FIG. 2A , acoustic spout  212  is formed through top wall  204 , in other words, above or over diaphragm  216 . In this aspect, transducer  200  may be considered a front-ported device. Acoustic spout  212  may, however, be formed through another wall of enclosure  202 , for example, bottom wall  206  such that transducer  200  is considered a back or bottom-ported device. 
     Acoustic spout  212  may be substantially similar to acoustic spout  112  described in reference to  FIG. 1A . In this aspect, acoustic spout  212  may have a z-height dimension extending from an outer surface of enclosure  202 . Said another way, acoustic spout  212  may form a lip like projection through which sound generated by transducer  200  can travel to the ambient environment. Spout  212  may be designed to limit the area that particles can directly ingress through acoustic port  210  and/or limit the direction that particles can ingress. In this aspect, spout  212  helps to reduce particle ingress into transducer  200 , as compared to a transducer having an opening through the wall without any sort of projection or spout  212 . For example, spout  212  may have a z-height dimension that extends far enough from the surface of the enclosure wall such that off-axis particles traveling towards acoustic spout  212  (i.e. particles traveling at an angle with respect to device axis  214 ) are blocked from entering acoustic port  210  by spout  212 . In addition, because of the z-height of spout  212 , particles traveling along the outer wall of enclosure  202  may be deflected up and away from acoustic port  210  by the walls of spout  212 . 
     Diaphragm  216  may be suspended from a frame  218  mounted within enclosure  202  by a suspension member  220 . Diaphragm  216  may include a sound radiating surface and be any type of diaphragm or sound radiating surface capable of vibrating in response to an acoustic signal to produce acoustic or sound waves. Voice coil  222  may be positioned along a face of diaphragm  216  and within a gap  226  formed by magnet assembly  224 . In this embodiment, voice coil  222  may be positioned along a top face of diaphragm  216  (i.e. a side of diaphragm  216  facing top wall  204 ) and magnet assembly  224  may, in turn, be positioned above or over the top face of diaphragm  216  (i.e. between diaphragm  216  and top wall  204 ) such that the diaphragm  216 , voice coil  222  and magnet assembly  224  arrangement in  FIG. 2A  is reversed, or flipped, in comparison to that of  FIG. 1A . In this arrangement the magnetic yoke  224  acts as a magnetic shield, reducing stray flux on the spout-side of the transducer. 
     Magnet assembly  224  may include a magnet  228  (e.g. a NdFeB magnet), an outer plate  260  and a yoke  230  for guiding a magnetic circuit generated by magnet  228 . Magnet assembly  224 , including magnet  228 , outer plate  260  and yoke  230 , may be positioned above diaphragm  216 , in other words, in this embodiment, magnet assembly  224  is between diaphragm  216  and spout  212 . Similar to  FIG. 1A , gap  226 , within which voice coil  222  is positioned, may be formed between yoke  230  and magnet  228 . Representatively, in one embodiment, magnet  228  may be a ring magnet having an open center portion  236  that is positioned around coil  222 . In this aspect, magnet  228  may be positioned entirely outside of coil  222  (i.e. coil  222  is entirely within the open center portion of magnet  228 ). Yoke  230  may include a substantially flat base portion  232  positioned along the top surface of magnet  228  and an arm portion  234  that extends from base portion  232  in a substantially perpendicular direction such that yoke  230  has a substantially “L” shaped profile. The arm portion  234  of yoke  230  may be positioned within open center portion  236  of magnet  228 . Gap  226  for coil  222  is formed between arm portion  234  and the inner side of magnet  228  facing arm portion  234 . In this aspect, the magnetic field produced by the magnetic circuit of magnet assembly  224  can be used to drive movement of coil  222 , which in turn, vibrates diaphragm  216  in a manner sufficient to produce the desired acoustic output from transducer  200 . 
     Similar to the acoustic spout described in reference to  FIG. 1A , acoustic spout  112  is dimensioned (e.g. has a z-height dimension) to reduce the pathway for particle ingress as compared to an acoustic port that does not include a spout as previously discussed. In addition, spout  212  is arranged with respect to magnet assembly  224  such that acoustic port  210  (and spout  212 ) is outside of the magnetic field, or a portion of the magnetic field that would draw particles, for example metallic or magnetic particles (e.g. iron filings), into acoustic port  210 . Such arrangement is illustrated in  FIG. 2B . 
     In this arrangement, yoke  230  not only contributes to the motor efficiency, but also shields the magnet from leaking stray flux to the spout side. 
       FIG. 2B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 2A . As can be seen from  FIG. 2B , magnet assembly  224  produces a magnetic field having magnetic field or flux lines  240  and  242  between magnet  228  and yoke  230 . As can be seen from  FIG. 2B , flux lines  240  and  242  follow a substantially elliptical path between magnet  228  and yoke  230 . In this aspect, portions of flux lines  240  and  242  can be considered aligned with a vertical axis  214  of magnet  228 , in other words they are axially aligned flux lines, while other portions can be considered aligned with a radial dimension  250  of magnet  228 , in other words they are radially aligned flux lines. In addition, flux lines  240  and  242  may be characterized as having a main flux component  252 A,  254 A (illustrated in solid lines) and a stray flux component  252 B,  254 B (illustrated in dashed lines). The main flux component  252 A,  254 A is concentrated in the coil gap  226  and is designed to drive movement of coil  222 . The stray flux component  252 B,  254 B is an unintended leakage in flux which extends outside of the main flux component  252 A,  254 A. In this aspect, the main flux component  252 A,  254 A may be understood to have a higher magnetic flux density than the stray flux component  252 B,  254 B. For example, the magnetic flux density near the main flux component  252 A,  254 A (e.g. over magnet  228 ) may be considered to be approximately twice that near the stray flux component  252 B,  254 B (e.g. over opening  236  of magnet  228 ). 
     Acoustic port  210 , and in turn spout  212 , is positioned such that it is outside of an area of higher magnetic flux density created by magnet assembly  224  such that particle ingress through spout  212  is reduced. In other words, spout  212  is positioned outside of the area of the magnetic field dominated by the main flux component  252 A,  254 A, particularly the axially aligned portions of the main flux component  252 A,  254 A. Said another way, spout  212  is positioned such that it is not aligned with axially aligned flux lines of the main flux component  252 A,  254 A. In this aspect, spout  212  may be positioned entirely outside of the magnetic field or within the magnetic field, but within an area where the strength of the magnetic field is reduced, for example, an area of reduced magnetic flux density. Said another way, spout  212  is offset with respect to the axis  214  of magnet  228 . Thus, in some embodiments, spout  212  is positioned directly above an open center portion  236  of magnet  228 , and not vertically aligned with magnet  228  such that it is outside of the area of highest flux density. Said another way, spout  212  may be axially aligned with the center opening  236  of magnet  228 . It has been found that this combination of the spout  212  configuration and spout arrangement with respect to magnet assembly  224  provides several advantages including (1) limiting the area that particles can directly ingress, (2) limiting the direction that particles can ingress, and (3) reducing particle ingress due to the magnetic field. 
     It is further noted that in this embodiment, yoke  230  is between magnet assembly  224  and spout  212 . For example, yoke  230  covers an area of magnet assembly  224  which would otherwise be exposed to spout  212 . Since yoke  230  is not magnetic, it may provide a magnetic barrier or shield between magnet assembly  224  and spout  212  which acts to further reduce a magnetic field near spout  212  which could otherwise contribute to particle ingress through spout  212 . 
       FIG. 3A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. Transducer  300  may be similar to transducer  100  described in reference to  FIG. 1A , for example, an electro-acoustic transducer that converts electrical signals into audible signals that can be output from a device within which transducer  300  is integrated. For example, transducer  300  may be a loudspeaker such as a microspeaker or earpiece found within a smart phone, or other similar relatively compact electronic device such as a laptop, notebook, or tablet computer. Transducer  300  may be enclosed within a housing or enclosure  302  having a top wall  304 , a bottom wall  306  and one or more sidewalls  308  connecting top wall  304  to bottom wall  306 . Enclosure  302  may further include an acoustic spout  312  extending from one of top wall  304 , bottom wall  306  or sidewalls  308 . Acoustic spout  312  defines an acoustic port  310  that provides a sound outlet port through which sound generated by transducer  300  can be output to the ambient environment. In the illustrated embodiment of  FIG. 3A , acoustic spout  312  is formed on top wall  304 , in other words, above diaphragm  316 . In this aspect, transducer  300  may be considered a front-ported device. Acoustic spout  312  may, however, be formed through another wall of enclosure  302 , for example, bottom wall  306  such that transducer  300  is considered a back or bottom-ported device. 
     Acoustic spout  312  may be substantially similar to acoustic spout  112  described in reference to  FIG. 1A . In this aspect, acoustic spout  312  may form a lip like projection through which sound generated by transducer  300  can travel to the ambient environment. Spout  312  may be designed to limit the area that particles can directly ingress through acoustic port  310  and/or limit the direction that particles can ingress. In this aspect, spout  312  helps to reduce particle ingress into transducer  300 , as compared to a transducer having an opening through the wall without any sort of projection or spout  312 . For example, spout  312  may have a z-height dimension that extends far enough from the surface of the enclosure wall such that off-axis particles traveling towards acoustic port  310  (i.e. particles traveling at an angle with respect to device axis  314 ) are blocked from entering acoustic port  310  by spout  312 . In addition, because of the z-height of spout  312 , particles traveling along the outer wall of enclosure  302  may be deflected up and away from acoustic port  310  by the walls of spout  312 . 
     Diaphragm  316  may be suspended from a frame  318  mounted within enclosure  302  by a suspension member  320 . Diaphragm  316  may include a sound radiating surface and be any type of diaphragm or sound radiating surface capable of vibrating in response to an acoustic signal to produce acoustic or sound waves. Voice coil  322  may be positioned along a face of diaphragm  316  and within a gap  326  formed by magnet assembly  324 . In this embodiment, voice coil  322  may be positioned along a bottom face of diaphragm  316  (i.e. a side of diaphragm  316  facing bottom wall  306 ) and magnet assembly  324  may, in turn, be positioned below or under the bottom face of diaphragm  316  (i.e. between diaphragm  316  and bottom wall  306 ). 
     Magnet assembly  324  may include a magnet  328  (e.g. a NdFeB magnet), an outer plate  360  and a yoke  330  for guiding a magnetic circuit generated by magnet  328 . Magnet assembly  324 , including magnet  328 , outer plate  360  and yoke  330 , may be positioned below or under diaphragm  316 , in other words, in this embodiment, magnet assembly  324  is between diaphragm  316  and bottom wall  306 . Gap  326 , within which voice coil  322  is positioned, may be formed between yoke  330  and magnet  328 . Representatively, in one embodiment, magnet  328  may be a center magnet that is positioned within coil  322 , both of which are surrounded by the yoke  330 . The center magnet may be void of any openings, in other words solid without any hollow regions or openings. Yoke  330  may include a substantially flat base portion  332  positioned along the bottom surface of magnet  328  and arm portions  334 A and  334 B that extend from base portion  332  in a substantially perpendicular direction such that yoke  330  has a substantially “U” shaped profile. The arm portions  334 A,  334 B of yoke  330  may be positioned around the outer edges of magnet  328 . Gap  326  for coil  322  is formed between arm portions  334 A,  334 B and the outer side of magnet  328  facing arm portions  334 A,  334 B. In this aspect, the magnetic field produced by the magnetic circuit of magnet assembly  324  can be used to drive movement of coil  322 , which in turn, vibrates diaphragm  316  in a manner sufficient to produce the desired acoustic output from transducer  300 . 
     Similar to the acoustic spout described in reference to  FIG. 1A , acoustic spout  312  has a z-height dimension that helps to reduce the pathway for particle ingress as compared to an acoustic opening that does not include a spout as previously discussed. In addition, spout  312  is arranged with respect to magnet assembly  324  such that spout  312  and acoustic port  310  are outside of the magnetic field, within a region of reduced magnetic field or a portion of the magnetic field that would otherwise draw particles, for example metallic or magnetic particles (e.g. iron filings), into acoustic port  310 . Such arrangement is illustrated in  FIG. 3B . For example, where magnet  328  is a center magnet, the acoustic spout  312  is positioned such that it is axially offset with respect to the center magnet (i.e. to a side of the center magnet and not directly over the center magnet). 
       FIG. 3B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 3A . As can be seen from  FIG. 3B , magnet assembly  324  produces a magnetic field having a main flux component  342  concentrated between magnet  328  and yoke  330  and a stray flux component  340 . As can be seen from  FIG. 3B , the stray flux component  340  follows a substantially elliptical path between magnet  328  and yoke  330 . In this aspect, portions of the stray flux component  340  can be considered aligned with a vertical axis  314  of magnet  328 , in other words they are axially aligned flux lines, while other portions can be considered aligned with a radial dimension  350  of magnet  328 , in other words they are radially aligned flux lines. The axially aligned flux lines of the stray flux component  340  are considered to be those lines within the dashed region  352 A shown in  FIG. 3B . The radially aligned flux lines of stray flux component  340  are considered to be those lines within the dashed region  352 B shown in  FIG. 3B . In other words, region  352 A is considered the area of the magnetic field dominated by the axial flux lines because it has more flux lines in the axial direction than the radial direction, in other words, more axial flux lines than radial flux lines. The region  352 B is, in turn, considered the areas of magnetic field dominated by the radial flux lines because it has more flux lines in the radial direction than the axial direction, in other words, more radial flux lines than axial flux lines. 
     Acoustic port  310 , and in turn spout  312 , is positioned such that it is outside of region  352 A such that the axially aligned flux lines generated by magnet assembly  324  are not aligned with the acoustic opening  310  and spout  312  and therefore not be able to affect particles near spout  312 . In other words, spout  312  is positioned outside of the area of the magnetic field dominated by the axial flux lines. Said another way, spout  312  is positioned such that it is not aligned with the magnetic field dominated by the axial component. To accomplish this, spout  312  could be positioned entirely outside of the magnetic field and thus an area of reduced magnetic field, or within the magnetic field, but within an area where the strength of the magnetic field is reduced, for example, outside of the area dominated by the axial flux lines (i.e. the area where there are more axial flux lines than radial flux lines). Said another way, spout  312  is offset with respect to the axis  314  of magnet  328  or not directly above magnet  328 , and in turn, the axially aligned flux lines. Thus, in some embodiments, spout  312  is positioned entirely outside of a footprint of magnet  328  such that it is outside of an area of the magnetic field dominated by the axial flux lines. Said another way, spout  312  may be off to the side of magnet  328 , for example, extending from a portion of top wall  304  between magnet assembly  324  and sidewall  308 , and within a portion of the magnetic field dominated by the radial flux lines (i.e. within region  352 B). As can be seen from the arrows indicating the direction of magnetic pull generated by the radial flux lines within region  352 B the radially aligned flux lines have a radially outward magnetic pull. Since the magnetic pull is outward or radial, the radial flux lines do not pull particles in through spout  312  and therefore do not contribute to particle ingress through spout  312 . Rather, it has been found that positioning spout  112  within the radial flux lines, or a region of the magnetic field dominated by the radial flux lines (i.e. more radial flux lines than axial flux lines) may actually further reduce metallic or magnetic particle ingress through spout  312  because, for example, the radial flux lines may pull the particles across spout  312  rather than into spout  312 . 
       FIG. 4A  illustrates a cross-sectional side view of another embodiment of a magnetic motor arrangement in a transducer. Transducer  400  may be similar to transducer  100  described in reference to  FIG. 1A , for example, an electro-acoustic transducer that converts electrical signals into audible signals that can be output from a device within which transducer  400  is integrated. For example, transducer  400  may be a loudspeaker such as a microspeaker or earpiece found within a smart phone, or other similar relatively compact electronic device such as a laptop, notebook, or tablet computer. Transducer  400  may be enclosed within a housing or enclosure  402  having a top wall  404 , a bottom wall  406  and one or more sidewalls  408  connecting top wall  404  to bottom wall  406 . Enclosure  402  may further include an acoustic spout  412  extending from one of top wall  404 , bottom wall  406  or sidewalls  408 . Acoustic spout  412  may define an acoustic port  410  that provides a sound outlet port through which sound generated by transducer  400  can be output to the ambient environment. In the illustrated embodiment of  FIG. 4A , acoustic spout  412 , and in turn acoustic port  410 , is formed on top wall  404 , in other words, above diaphragm  416 . In this aspect, transducer  400  may be considered a front-ported device. Acoustic spout  412  may, however, be formed through another wall of enclosure  402 , for example, bottom wall  406  such that transducer  400  is considered a back or bottom-ported device. 
     Acoustic spout  412  may be substantially similar to acoustic spout  112  described in reference to  FIG. 1A . In this aspect, acoustic spout  412  may form a lip like projection through which sound generated by transducer  400  can travel to the ambient environment. Spout  412  may be designed to limit the area that particles can directly ingress through acoustic port  410  and/or limit the direction that particles can ingress. In this aspect, spout  412  helps to reduce particle ingress into transducer  400 , as compared to a transducer having an opening through the wall without any sort of projection or spout  412 . For example, spout  412  may have a z-height dimension that extends far enough from the surface of the enclosure wall such that off-axis particles traveling towards acoustic port  410  (i.e. particles traveling at an angle with respect to device axis  414 ) are blocked from entering acoustic port  410  by spout  412 . In addition, because of the z-height of spout  412 , particles traveling along the outer wall of enclosure  402  may be deflected up and away from acoustic port  410  by the walls of spout  412 . 
     Diaphragm  416  is suspended from a frame  418  mounted within enclosure  402  by a suspension member  420 . Diaphragm  416  may include a sound radiating surface and be any type of diaphragm or sound radiating surface capable of vibrating in response to an acoustic signal to produce acoustic or sound waves. Transducer  400  may also include a voice coil  422 . Voice coil  422  may be positioned along a face of diaphragm  416  and within a gap  426  formed by magnet assembly  424 . In this embodiment, voice coil  422  may be positioned along a bottom face of diaphragm  416  (i.e. a side of diaphragm  416  facing bottom wall  406 ) and magnet assembly  424  may, in turn, be positioned below or under the bottom face of diaphragm  416  (i.e. between diaphragm  416  and bottom wall  406 ). 
     Magnet assembly  424  may include a center or inner magnet  428 A and an outer magnet  428 B (e.g. a NdFeB magnet), an inner top plate  432 A over inner magnet  428 A, an outer top plate  432 B over outer magnet  428 B and a bottom or back plate  430  for guiding a magnetic circuit generated by inner magnet  428 A and outer magnet  428 B. In one embodiment, inner magnet  428 A may be void of any openings, in other words solid without any hollow regions. Magnet assembly  424  may be positioned below diaphragm  416 , in other words, in this embodiment, magnet assembly  424  is between diaphragm  416  and bottom wall  406 . Gap  426 , within which voice coil  422  is positioned, may be formed between inner magnet  428 A and outer magnet  428 B. Representatively, in one embodiment, inner magnet  428 A may be center magnet that is positioned within coil  422  and outer magnet  428 B may be positioned around coil  422  such that coil  422  is between inner magnet  428 A and outer magnet  428 B. In this aspect, the magnetic field produced by the magnetic circuit of magnet assembly  424  can be used to drive movement of coil  422 , which in turn, vibrates diaphragm  416  in a manner sufficient to produce the desired acoustic output from transducer  400 . 
     Similar to the acoustic spout described in reference to  FIG. 1A , acoustic spout  412  has a z-height dimension sufficient to reduce the pathway for particle ingress as compared to an acoustic opening that does not include a spout as previously discussed. In addition, spout  412  is arranged with respect to magnet assembly  424  such that it is outside of the magnetic field, or a portion of the magnetic field that would draw particles, for example metallic or magnetic particles (e.g. iron filings), into acoustic port  410 . Such arrangement is illustrated in  FIG. 4B . 
       FIG. 4B  illustrates a magnetic field of the magnetic motor arrangement of  FIG. 4A . As can be seen from  FIG. 4B , magnet assembly  424  produces a magnetic field having a stray flux component  440  (illustrated by dashed lines) and a main flux component  442  (illustrated by solid lines). The main flux component  442  is concentrated between inner magnet  428 A and outer magnet  428 B. The main flux component  442  is designed to drive movement of the coil  422 . As can be seen from  FIG. 4B , the stray flux component  440  and the main flux component  442  follow a substantially elliptical path. In this aspect, portions of the stray flux component  440  and the main flux component  442  can be considered aligned with a vertical axis  414  of magnet assembly  424 , in other words they are axially aligned flux lines, while other portions can be considered aligned with a radial dimension  450  of magnet assembly  424 , in other words they are radially aligned flux lines. 
     In general, the axially aligned flux lines can have a vertically aligned magnetic pull. In addition, the radially aligned flux lines can have a radially aligned pull. Acoustic port  410 , and in turn spout  412 , is positioned such that the axially aligned component is not aligned with the acoustic opening  410  and spout  412  and therefore not be able to pull particles in through spout  412 . In other words, spout  412  is positioned outside of the area of the magnetic field dominated by the axial flux lines. Said another way, spout  412  is positioned such that it is not aligned with the magnetic pull created by the axial flux lines. To accomplish this, spout  412  could be positioned entirely outside of the magnetic field or within the magnetic field, but within an area where the strength of the magnetic field is reduced, for example, outside of the area dominated by the axial flux lines (i.e. the area where there are more axial flux lines than radial flux lines) or the main flux component  442 . Said another way, spout  412  is offset with respect to the axis  414  of magnet  428  and, in turn, the axially aligned flux lines. Thus, in some embodiments, spout  412  is positioned entirely outside of a footprint of magnet  428  such that it is outside of an area of the magnetic field dominated by the axial flux lines. Said another way, spout  412  may be off to the side of magnet  428  and frame  418 . For example, in one embodiment, spout  412  may extend from a portion of top wall  404  that is between magnet assembly  424  and sidewall  408  (i.e. over the area between magnet assembly  424  and sidewall  408 ), for example, formed by a portion of sidewall  408  such that it is adjacent to sidewall  408 , and entirely outside of the magnetic field. 
       FIG. 5  illustrates one embodiment of a simplified schematic view of one embodiment of an electronic device in which a transducer, such as that described herein, may be implemented. As seen in  FIG. 5 , the transducer may be integrated within a consumer electronic device  502  such as a smart phone with which a user can conduct a call with a far-end user of a communications device  504  over a wireless communications network; in another example, the transducer may be integrated within the housing of a tablet computer. These are just two examples of where the transducer described herein may be used, it is contemplated, however, that the transducer may be used with any type of electronic device in which a transducer, for example, a loudspeaker or receiver, is desired, for example, a tablet computer, a desk top computing device or other display device. 
       FIG. 6  illustrates a block diagram of some of the constituent components of an embodiment of an electronic device in which an embodiment of the invention may be implemented. Device  600  may be any one of several different types of consumer electronic devices. For example, the device  600  may be any transducer-equipped mobile device, such as a cellular phone, a smart phone, a media player, or a tablet-like portable computer. 
     In this aspect, electronic device  600  includes a processor  612  that interacts with camera circuitry  606 , motion sensor  604 , storage  608 , memory  614 , display  622 , and user input interface  624 . Main processor  612  may also interact with communications circuitry  602 , primary power source  610 , speaker  618 , and microphone  620 . Speaker  618  may be a microspeaker such as that described in reference to  FIG. 1A . The various components of the electronic device  600  may be digitally interconnected and used or managed by a software stack being executed by the processor  612 . Many of the components shown or described here may be implemented as one or more dedicated hardware units and/or a programmed processor (software being executed by a processor, e.g., the processor  612 ). 
     The processor  612  controls the overall operation of the device  600  by performing some or all of the operations of one or more applications or operating system programs implemented on the device  600 , by executing instructions for it (software code and data) that may be found in the storage  608 . The processor  612  may, for example, drive the display  622  and receive user inputs through the user input interface  624  (which may be integrated with the display  622  as part of a single, touch sensitive display panel). In addition, processor  612  may send an audio signal to speaker  618  to facilitate operation of speaker  618 . 
     Storage  608  provides a relatively large amount of “permanent” data storage, using nonvolatile solid state memory (e.g., flash storage) and/or a kinetic nonvolatile storage device (e.g., rotating magnetic disk drive). Storage  608  may include both local storage and storage space on a remote server. Storage  608  may store data as well as software components that control and manage, at a higher level, the different functions of the device  600 . 
     In addition to storage  608 , there may be memory  614 , also referred to as main memory or program memory, which provides relatively fast access to stored code and data that is being executed by the processor  612 . Memory  614  may include solid state random access memory (RAM), e.g., static RAM or dynamic RAM. There may be one or more processors, e.g., processor  612 , that run or execute various software programs, modules, or sets of instructions (e.g., applications) that, while stored permanently in the storage  608 , have been transferred to the memory  614  for execution, to perform the various functions described above. 
     The device  600  may include communications circuitry  602 . Communications circuitry  602  may include components used for wired or wireless communications, such as two-way conversations and data transfers. For example, communications circuitry  602  may include RF communications circuitry that is coupled to an antenna, so that the user of the device  600  can place or receive a call through a wireless communications network. The RF communications circuitry may include a RF transceiver and a cellular baseband processor to enable the call through a cellular network. For example, communications circuitry  602  may include Wi-Fi communications circuitry so that the user of the device  600  may place or initiate a call using voice over Internet Protocol (VOIP) connection, transfer data through a wireless local area network. 
     The device may include a microphone  620 . Microphone  620  may be an acoustic-to-electric transducer or sensor that converts sound in air into an electrical signal. The microphone circuitry may be electrically connected to processor  612  and power source  610  to facilitate the microphone operation (e.g. tilting). 
     The device  600  may include a motion sensor  604 , also referred to as an inertial sensor, that may be used to detect movement of the device  600 . The motion sensor  604  may include a position, orientation, or movement (POM) sensor, such as an accelerometer, a gyroscope, a light sensor, an infrared (IR) sensor, a proximity sensor, a capacitive proximity sensor, an acoustic sensor, a sonic or sonar sensor, a radar sensor, an image sensor, a video sensor, a global positioning (GPS) detector, an RF or acoustic doppler detector, a compass, a magnetometer, or other like sensor. For example, the motion sensor  604  may be a light sensor that detects movement or absence of movement of the device  600 , by detecting the intensity of ambient light or a sudden change in the intensity of ambient light. The motion sensor  604  generates a signal based on at least one of a position, orientation, and movement of the device  600 . The signal may include the character of the motion, such as acceleration, velocity, direction, directional change, duration, amplitude, frequency, or any other characterization of movement. The processor  612  receives the sensor signal and controls one or more operations of the device  600  based in part on the sensor signal. 
     The device  600  also includes camera circuitry  606  that implements the digital camera functionality of the device  600 . One or more solid state image sensors are built into the device  600 , and each may be located at a focal plane of an optical system that includes a respective lens. An optical image of a scene within the camera&#39;s field of view is formed on the image sensor, and the sensor responds by capturing the scene in the form of a digital image or picture consisting of pixels that may then be stored in storage  608 . The camera circuitry  606  may also be used to capture video images of a scene. 
     Device  600  also includes primary power source  610 , such as a built in battery, as a primary power supply. 
     While certain embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that the invention is not limited to the specific constructions and arrangements shown and described, since various other modifications may occur to those of ordinary skill in the art. For example, the devices and processing steps disclosed herein may correspond to any type of transducer that could benefit from reduced magnetic particle ingress, for example, an acoustic-to-electric transducer such as a microphone. The description is thus to be regarded as illustrative instead of limiting.

Metadata:
Filing Date: 20140819
Publication Date: 20170523
Grant Date: 20170523
Priority Date: 20140819
Inventors: PORTER SCOTT P.
DAVE RUCHIR M.
WILK CHRISTOPHER R.
Assignee: APPLE INC
CPC Classifications: [{"code": "H04R2499/11", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R2209/022", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R1/023", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R2209/024", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R9/025", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04R9/046", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R9/025", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04R2499/11", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R9/046", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R1/023", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R2209/022", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R2209/024", "inventive": false, "first": false, "tree": "[]"}]
Family ID: 55349468