PATENT DOCUMENT

Publication Number: US-11797057-B2
Application Number: US-202217805835-A
Country: US
Kind Code: B2

Title: Electronic device having sealed button biometric sensing system

Abstract:
A biometric button assembly may be disposed in an opening of an enclosure of an electronic device. The biometric button assembly may include an input member that forms an exterior surface of the button housing and is configured to receive inputs, for example from a user of the electronic device. The biometric button assembly may further include a biometric sensor for detecting the received inputs and transmitting a signal to a processor of the electronic device. The signal may correspond to a biometric characteristic, such as a fingerprint. A flexible conduit may transmit the signal to the processor. A portion of the flexible conduit and a seal may be positioned between the button assembly and the enclosure that prevents contaminants from entering the button housing and the enclosure.

Claims:
What is claimed is: 
     
       1. An input assembly for an electronic device, the input assembly comprising:
 an enclosure defining an enclosed volume, an external surface, a shelf, and an opening between the external surface and the enclosed volume, the shelf laterally extending into the opening; 
 an input member; 
 a compressible layer positioned between the shelf and the input member; and 
 a seal laterally external to the input member; 
 wherein the input member is positioned on the compressible layer, and 
 wherein the compressible layer is compressible to permit displacement of the input member relative to the shelf. 
 
     
     
       2. The input assembly of  claim 1 , further comprising:
 a biometric sensor positioned internal to the input member and configured to produce an output signal in response to a touch on an input surface of the input member; 
 a processing device in electronic communication with the biometric sensor; 
 a memory device in electronic communication with the processing device; 
 a display providing an input surface; 
 at least one touch sensing device configured to receive touch input at the input surface of the input member. 
 
     
     
       3. The input assembly of  claim 1 , further comprising a biometric sensor positioned internal to the input member and configured to produce an output signal in response to a touch on an input surface of the input member. 
     
     
       4. The input assembly of  claim 3 , further comprising a processing device and a memory device in electronic communication with the biometric sensor. 
     
     
       5. The input assembly of  claim 3 , further comprising a flexible conduit in electronic communication with the biometric sensor and extending through the opening. 
     
     
       6. The input assembly of  claim 1 , further comprising a position sensor to output a signal in response to displacement of the input member relative to the shelf. 
     
     
       7. The input assembly of  claim 1 , further comprising a button housing including a shelf portion attached to the enclosure via at least one fastener positioned on an opposite side of the shelf relative to the input member. 
     
     
       8. The input assembly of  claim 1 , wherein the compressible layer comprises silicon. 
     
     
       9. The input assembly of  claim 1 , wherein the input member at least partially protrudes from the external surface. 
     
     
       10. An input assembly for an electronic device, the input assembly comprising:
 an enclosure wall having an external surface, an opening defined in the external surface, and a shelf positioned in the opening; and 
 a button housing at least partially positioned in the opening and defining an input surface, at least a portion of the button housing being displaceable relative to the shelf; and 
 a gasket contacting the shelf and the button housing and sealing a gap between the shelf and the button housing. 
 
     
     
       11. The input assembly of  claim 10 , wherein the button housing includes an input member and a lower end portion having a housing wall extending around the input member. 
     
     
       12. The input assembly of  claim 11 , wherein the gasket contacts an inward-facing surface of the lower end portion of the button housing. 
     
     
       13. The input assembly of  claim 10 , wherein the button housing defines a second shelf and includes an input member having an inward-facing surface, the second shelf extending between the inward-facing surface and the shelf of the enclosure wall. 
     
     
       14. The input assembly of  claim 10 , wherein the button housing is at least partially deflectable toward the shelf. 
     
     
       15. An electronic watch comprising:
 an enclosure defining an enclosed volume and an opening formed in a sidewall; 
 a processor disposed in the enclosed volume; 
 a display positioned within the enclosure and operably coupled to the processor; 
 a watchband attached to the enclosure and configured to couple the electronic watch to a user; and 
 a button assembly disposed within the opening of the enclosure and including:
 a button housing having a longitudinally-inward-facing surface facing a longitudinally-outward-facing surface of the opening; 
 a seal positioned between and contacting the longitudinally-inward-facing surface and the longitudinally-outward-facing surface; and 
 a sensor configured to output a signal in response to a force applied to the button housing deflecting at least a portion of the button housing toward the longitudinally-outward-facing surface. 
 
 
     
     
       16. The electronic watch of  claim 15 , further comprising a biometric sensor positioned longitudinally inward relative to an outer surface of the button housing and in electronic communication with the processor, the biometric sensor being capable of sensing a biometric characteristic of the user applying the force to the button housing. 
     
     
       17. The electronic watch of  claim 16 , wherein the biometric characteristic includes a fingerprint. 
     
     
       18. The electronic watch of  claim 15 , wherein the seal is configured to prevent contaminants from passing through the opening. 
     
     
       19. The electronic watch of  claim 15 , wherein the seal comprises an elastomeric material. 
     
     
       20. The electronic watch of  claim 15 , wherein:
 the button housing further comprises an input member at an outer surface; 
 the input member having an input surface; and 
 the input member is configured to deflect in response to the force applied to the input surface.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of U.S. patent application Ser. No. 17/094,992, filed 11 Nov. 2020, and entitled “ELECTRONIC DEVICE HAVING SEALED BUTTON BIOMETRIC SENSING SYSTEM,” which is a continuation of U.S. patent application Ser. No. 15/627,336, filed 19 Jun. 2017, entitled “ELECTRONIC DEVICE HAVING SEALED BUTTON BIOMETRIC SENSING SYSTEM,” now U.S. Pat. No. 10,866,618, issued 15 Dec. 2020, the disclosures of which are hereby incorporated by reference herein in their entireties. 
    
    
     FIELD 
     The described embodiments relate generally to electronic devices. More particularly, this disclosure relates to a biometric sensing system in an electronic device. Still more particularly, the present invention relates to a fingerprint sensing system integrated with a button. 
     BACKGROUND 
     Many traditional electronics include buttons, keys, or other types of components. Many traditional buttons merely function as switches and are not able to sense a biometric characteristic. Additionally, some traditional buttons may be difficult to seal and may allow for ingress of liquid and other contaminants. The systems and devices described herein are directed to biometric sensing systems that may address these and other issues that are associated with some traditional buttons. 
     SUMMARY 
     In one aspect, an electronic device is disclosed, the electronic device comprising: an enclosure having an enclosed volume and an opening formed in a sidewall; a processor positioned in the enclosed volume; a button assembly within the opening, the button assembly comprising: an input member having an input surface; and a biometric sensor positioned below the input member and configured to produce an output signal in response to a touch on the input surface, the output signal corresponding to a biometric characteristic; a seal positioned between a sealing surface of the button assembly and the enclosure; and a flexible conduit coupled to the biometric sensor and configured to transmit the output signal to the processor; wherein: a portion of the flexible conduit is disposed between the sealing surface and the enclosure. 
     In another aspect, the button assembly further comprises: a tactile dome switch configured to compress in response to a press on the input surface; a plunger positioned below the biometric sensor and above the tactile dome switch, the plunger displacing and compressing the tactile dome switch in response to the press on the input surface; and a retainer defining an aperture housing the plunger; wherein the retainer defines the sealing surface of the button assembly. In another aspect, the seal includes a gasket and a pressure sensitive adhesive (PSA) layer; and the portion of the flexible conduit is positioned between the gasket and the sealing surface of the button assembly. In another aspect, the seal is overmolded around the portion of the flexible conduit. In another aspect, the flexible conduit passes through an aperture in the seal. In another aspect, the electronic device further comprises a passage extending from the opening to the enclosed volume, wherein the flexible conduit passes through the passage. In another aspect, an enclosure shelf is defined at the bottom of the opening; the passage is formed in the enclosure shelf; and the seal encircles the passage. In another aspect, the portion of the flexible conduit encircles the passage. In another aspect, the biometric sensor is a fingerprint sensor and the biometric characteristic is a fingerprint. In another aspect, the biometric sensor comprises an array of capacitive sensing elements that are configured to detect either or both of the ridges and grooves of a user&#39;s finger. 
     In another aspect, a fingerprint sensing system for a wearable device is disclosed, the fingerprint sensing system comprising: an enclosure defining an enclosed volume and an opening along an exterior surface; a processor disposed in the enclosed volume; a button assembly positioned in the opening and defining an input surface, the button assembly comprising: a fingerprint sensor positioned inward from the input surface; and a retainer positioned inward from the input surface and defining a sealing surface; a seal disposed between the sealing surface of the retainer and a surface of the opening; a passage extending from the opening to the enclosed volume; and a flexible conduit electrically connecting the fingerprint sensor to the processor; wherein: a portion of the flexible conduit is disposed between the sealing surface of the retainer and the surface of the opening. 
     In another aspect, the flexible conduit extends through the passage. In another aspect, the flexible conduit is coupled to a second flexible conduit that extends through the passage. In another aspect, the fingerprint sensor is further configured to detect a touch. In another aspect, the button assembly further comprises a tactile dome switch disposed inward from the retainer; and the tactile dome switch compresses in response to a press on the input surface. 
     In one aspect, a watch is disclosed, the watch comprising: an enclosure defining an enclosed volume and an opening formed in a sidewall; a processor disposed in the enclosed volume; a display positioned within the disclosure and operably coupled to the processor; a watchband attached to the enclosure and configured to couple the watch to a user; and a button assembly disposed within the opening, the button assembly comprising: a button housing; an input member with an input surface; a fingerprint sensor positioned below the input member and configured to produce an output signal in response to a touch on the input surface, the output signal corresponding to a fingerprint; and a touch sensor configured to detect the touch. 
     In another aspect, the watch further comprises a flexible conduit electrically coupled to the fingerprint sensor and configured to transmit the output signal to the processor; and a passage extending from the opening to the enclosed volume; wherein the flexible conduit extends from the opening to the enclosed volume through the passage. In another aspect, the watch further comprises a seal positioned between the button housing and a surface of the opening, and a fastener attaching the button housing to the enclosure and placing the seal in compression. In another aspect, the watch further comprises a compressible layer disposed below the fingerprint sensor, the compressible layer compressing to receive a displacement or a deflection of the input member upon receipt of a user force to the input surface. In another aspect, the watch further comprises an electrical isolation sheet disposed between the button housing and the enclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like elements. The elements of the drawings are not necessarily to scale relative to each other. Identical reference numerals have been used, where possible, to designate identical features that are common to the figures. 
         FIG.  1    illustrates a view of one example of an electronic device with a biometric sensing system and button assembly according to various embodiments; 
         FIG.  2 A  is a cross-section view of the electronic device of  FIG.  1   , taken along section A-A in  FIG.  1    and showing one embodiment of a biometric sensing system with button assembly in a first or undepressed state; 
         FIG.  2 B  is a cross-section view of the electronic device of  FIG.  2 A  with button assembly in a second or depressed state; 
         FIG.  3 A  is a cross-section view of the electronic device of  FIG.  1   , taken along section A-A in  FIG.  1    and showing another embodiment of a biometric sensing system; 
         FIG.  3 B  is an exploded view of portions of the embodiment of a biometric sensing system of  FIG.  3 A ; 
         FIG.  3 C  is another view of portions of the embodiment of a biometric sensing system of  FIG.  3 A ; 
         FIG.  3 D  is a cross-section view of the electronic device of  FIG.  1   , taken along section A-A in  FIG.  1    and showing another embodiment of a biometric sensing system; 
         FIG.  4 A  is a cross-section view of the electronic device of  FIG.  1   , taken along section B-B in  FIG.  1    and showing another embodiment of a biometric sensing system; 
         FIG.  4 B  is a cross-section view of the electronic device of  FIG.  1   , taken along section B-B in  FIG.  1   ; 
         FIG.  4 C  is an exploded view of portions of the embodiment of a biometric sensing system of  FIG.  4 B ; 
         FIG.  4 D  is an exploded view of portions of the embodiment of a biometric sensing system of  FIG.  4 C ; 
         FIG.  4 E  is a cross-section view of the electronic device of  FIG.  1   , taken along section B-B in  FIG.  1    and showing another embodiment of a biometric sensing system  401 ; and 
         FIG.  5    is an illustrative block diagram of an electronic device such as described herein. 
     
    
    
     The use of cross-hatching or shading in the accompanying figures is generally provided to clarify the boundaries between adjacent elements and also to facilitate legibility of the figures. Accordingly, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, element proportions, element dimensions, commonalities of similarly illustrated elements, or any other characteristic, attribute, or property for any element illustrated in the accompanying figures. 
     Additionally, it should be understood that the proportions and dimensions (either relative or absolute) of the various features and elements (and collections and groupings thereof) and the boundaries, separations, and positional relationships presented there between, are provided in the accompanying figures merely to facilitate an understanding of the various embodiments described herein and, accordingly, may not necessarily be presented or illustrated to scale, and are not intended to indicate any preference or requirement for an illustrated embodiment to the exclusion of embodiments described with reference thereto. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following descriptions are not intended to limit the embodiments to one preferred implementation. To the contrary, the described embodiments are intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the disclosure and as defined by the appended claims. 
     The embodiments disclosed herein are directed to a button with a biometric sensor. For example, the biometric sensor may be a fingerprint sensor. The biometric sensor produces an output signal in response to a user input to the button, such as a user touch. The output signal provides data associated with a biometric characteristic of the user, such as a fingerprint. The output signal is processed by a processor positioned inside the electronic device. A flexible conduit transmits the output signal of the biometric button to the processor of the electronic device. The processor, and other electronic components inside the electronic device, are sensitive to contaminants, such as dust, debris, and liquid. The interface between the button and the electronic device may provide a pathway for entry of contaminants. The routing of the electrical connection between the sensor and the processor may introduce an additional entry path for contaminants into the electronic device. To address these design challenges, a flexible conduit cooperates with a seal fitted between a button of the electronic device. The combined seal and flexible conduit restrict contaminants from entering the electronic device while providing an electrical connection between the biometric sensor and the processor. 
     Two principal embodiments of a button with a biometric sensor are disclosed. In the first embodiment, a button of an electronic device is movable and includes a biometric sensor and a tactile switch. As the button moves, a tactile switch is compressed and produces a tactile output. The biometric sensor produces an output signal in response to a user touch and corresponds to a biometric characteristic of a user (e.g., a fingerprint). A flexible conduit transmits the sensor data to a processor positioned inside the electronic device. The flexible conduit also cooperates with a seal to restrict ingress of contaminants into the electronic device. 
     In the second embodiment, a button of an electronic device is stationary and includes both a touch sensor to detect a user input and a biometric sensor. Similar to the first embodiment, the biometric sensor produces an output signal in response to a user touch. A flexible conduit transmits the sensor data to a processor positioned inside the electronic device. A capacitive touch sensor is configured to detect an input to the button input member. The button is sealed by a seal positioned between a button housing and an enclosure of the electronic device. 
     These and other embodiments are discussed below with reference to  FIGS.  1 - 5   . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes only and should not be construed as limiting. 
       FIG.  1    illustrates an example electronic device  100  that may incorporate a biometric sensing system  101 , as described herein. The electronic device  100  includes an enclosure  120  and a biometric button assembly  110  disposed in an opening of the enclosure  120 . The biometric button assembly  110  may displace into the enclosure  120  and may include an input member  112  and a biometric sensor. 
     The biometric sensor may sense a biometric characteristic of the user. The biometric sensor may be implemented in any of several configurations including, for example, a capacitive sensor that can be used to identify a fingerprint. “Biometric sensor,” as used herein, may be used to refer to a sensor that can identify or determine a human physical characteristic. The sensed human physical characteristic may vary widely, but may include fingerprint, palm veins, DNA, heart rate, and blood pressure. A capacitive biometric sensor may sense fingerprint characteristics of a user touch that may be used to provide a fingerprint identification of the user. In addition to providing an output that corresponds to a biometric characteristic, the output of the biometric sensor may indicate whether an input (e.g., a touch, a press, or the like) occurs, an approximate location where an input occurs, and/or a measure of the input, e.g., a measurement of absolute capacitance or capacitance change. 
     The biometric characteristic sensed by the biometric sensor may be used by the device in a number of different ways. For example, the biometric characteristic may be used to identify a user and, thus, may provide a biometric identification for a process or a transaction. The biometric identification may be used to, for example, unlock an electronic device, authorize a transaction, send an alert, and/or enable applications running on the electronic device. A “biometric characteristic” or a “biometric identifier,” as used herein, may refer to a human characteristic that is so distinctive and measureable that a particular human individual may be identified. Fingerprints and DNA are example biometric characteristics. 
     The biometric sensing system  101  may be configured as a button, as depicted in  FIG.  1   . Other configurations are possible, such as a key of a keyboard or a joystick of a gaming device. The input member  112  of the biometric sensing system  101  may be touched, pressed, or otherwise interacted with by a user. The input member  112  may translate, deflect, bend, or otherwise move a relatively small distance in response to user input. 
     The biometric sensor produces an output signal in response to a user input to the button, such as a user touch. The output signal provides data associated with a biometric characteristic of the user, such as a fingerprint. The output signal typically requires processing to determine a biometric characteristic, such as a user fingerprint. The processing of the output signal is performed by a processor disposed within the enclosure  120  of the electronic device  100 . An electrical connector couples the biometric sensor and the processor to transmit the output signal from the biometric sensor to the processor positioned in the enclosure  120 . 
     It is desirable to seal the enclosure  120  from contaminants to protect internal components that may be sensitive to contaminants. “Contaminants,” as used herein, may be used to refer to solids, liquids, and other foreign matter that are not suitable or may be harmful to internal components of the electronic device. Example contaminants include liquids, such as water, and solid matter, such as lint, dust, and food particles. As described herein, the biometric sensing system  101  may be configured to reduce or prevent the ingress of contaminates. In some cases, a seal including for example a gasket and/or adhesive, may be fitted between the biometric sensing system  101  and the opening of the enclosure  120  to restrict the ingress of contaminants into the enclosure  120 . To “seal,” as used herein, may be used to refer to closing off an opening or a connection. When referenced to a part or component, the term “seal,” as used herein, may be used to refer to an element or a group of elements that blocks or inhibits the ingress or entry of foreign debris or contaminants. 
     The routing of the electrical connection between the sensor and the processor may also be configured to reduce or prevent the ingress of contaminants into the device enclosure. As described herein, a flexible conduit or flexible connector that transmits an output signal from the biometric sensor to the processor may form part of a seal that blocks or inhibits the ingress or entry of foreign debris or contaminants into the enclosure  120 . 
     In the illustrated embodiment, the electronic device  100  is implemented as a wearable computing device (e.g., an electronic watch). The electronic device  100  is depicted as a watch with watchband  104 , display  103 , and crown  102 . The display  103  is positioned at least partially within the enclosure  120  and may be covered with a cover sheet or other transparent protective cover. The watch crown  102  and the biometric button assembly are at least partially positioned within respective openings in the enclosure  120 . 
     The enclosure  120  provides a device structure, defines an internal volume of the electronic device  100 , and houses device components. In various embodiments, the enclosure  120  may be constructed from any suitable material, including metals (e.g., aluminum, steel, titanium), polymers, ceramics (e.g., zirconia, glass, sapphire), and the like. In one embodiment, the enclosure  120  is constructed from multiple materials. The enclosure  120  can form an outer surface or partial outer surface and protective case for the internal components of the electronic device  100 , and may at least partially surround the display  103 . The enclosure  120  can be formed of one or more components operably connected together, such as a front piece and a back piece. Alternatively, the enclosure  120  can be formed of a single piece operably connected to the display  103 . 
     In one embodiment, the enclosure  120  defines an enclosed volume, and may include a passage between the enclosed volume and the opening such that the biometric button assembly  110  and additional components of the electronic device  100  may be physically coupled, for example, by an electrical connector. In contrast to conventional buttons, the biometric button assembly  110  includes a biometric sensor and a flexible conduit to transmit biometric sensor data to a processor of the electronic device  100 . In one embodiment, a flexible conduit may pass through the passage. In one embodiment, the flexible conduit cooperates with a seal to restrict the ingress of contaminants through the passage. 
     The biometric button assembly  110  is positioned or set in an opening of the electronic device  100 . The button assembly  110  may be disposed on any of several locations of the electronic device  100 . For example, the button assembly  110  may be positioned along a sidewall of an enclosure  120  of an electronic device  100 , as depicted in  FIG.  1   , in which the button assembly  110  is positioned on a sidewall of a watch. 
     Elements of the button assembly  110  may be integrated with other components of an electronic device. For example, a biometric sensor may be integrated with the rotatable watch crown  102  of a watch. In such an embodiment, a surface of the watch crown may provide an input surface for a biometric sensor of the button assembly, while the watch crown  102  maintains an ability to rotate. In some embodiments, the button assembly  110  may be positioned on a different portion of an electronic device  100 , such as on an upper face of an electronic device  100 . For example, the button assembly  110  may be disposed adjacent the keyboard of a laptop computer. 
     The button assembly  110  includes an input member  112  that may be touched, pressed, or otherwise interacted with by a user. The input member  112  may translate, deflect, bend, or otherwise move a relatively small distance in response to user input. The input member  112  may comprise one or more layers. In one embodiment, an outer layer is a cap formed of a durable material such as sapphire. In one embodiment, the button assembly  110  is a sealed button assembly with a biometric sensing capability. Such embodiments are discussed in greater detail below with respect to  FIGS.  2 - 5   . 
     The button assembly  110  may be positioned to extend from the electronic device  100 , as depicted in  FIG.  1   . Other configurations of the mounting of the button assembly  110  are possible. For example, the exterior of the button assembly  110  may be conformal with an adjacent input surface of an electronic device  100 , or may be depressed or recessed with respect to an adjacent exterior of an electronic device  100 . Furthermore, an exterior upper surface of the button assembly  110  may be planar or non-planar. For example, the exterior upper surface of the button assembly may form a generally convex or concave cross-sectional shape. In one embodiment, the exterior upper surface is splined, meaning, for example, that the input surface extends beyond an active sensor area. Such a spline may be formed for cosmetic or aesthetic reasons. In embodiments in which the button assembly  110  extends from the electronic device  100 , the button assembly  110  may present a first geometry for a portion extending from the electronic device, and a second geometry for another portion contained within the enclosure  120  of the electronic device  100 . 
     In embodiments in which the button assembly extends from the electronic device  100 , such as shown in  FIG.  1   , the button assembly  110  may present a first geometry for a portion extending from the electronic device, and a second geometry for another portion contained within the electronic device  100 . For example, the button assembly  110  depicted in  FIG.  1    presents an oblong or oval geometry for the portion extending from the watch device, yet may have a rectangular geometry, an oblong geometry of reduced dimension, and/or an other-than-oblong geometry within the watch device. The button assembly  110  may be shaped in any of several geometries. For example, the button assembly may be circular, oblong, or rectangular. 
     As shown in  FIG.  1   , the electronic device  100  also includes a crown  102  that receives inputs from a user. In one embodiment, the watch crown  102  is configured to rotate about an axis and translate along the axis in response to manipulation. The watch crown  102  may further include a switch such as a dome switch to provide a tactile response to translation of the watch crown. As mentioned previously, elements or components of the biometric button assembly may be integrated with the watch crown  102  such that the watch crown has some or all of the characteristics of the biometric button assemblies described herein. For example, a biometric sensor, such as a fingerprint sensor, may produce an output signal in response to a user touch to a surface of the watch crown, the output signal corresponding to a fingerprint. 
     As shown in  FIG.  1   , the electronic device  100  also includes a display  103  that can be implemented with any suitable technology, including, but not limited to liquid crystal display (LCD) technology, light emitting diode (LED) technology, organic light-emitting display (OLED) technology, organic electroluminescence (OEL) technology, or another type of display technology. The display  103  provides a graphical output, for example associated with an operating system, user interface, and/or applications of the electronic device  100 . In one embodiment, the display  103  includes one or more sensors and is configured as a touch-sensitive (e.g., single-touch, multi-touch) and/or force-sensitive display to receive inputs from a user. The display  103  is operably coupled to a processor of the electronic device  100  and in various embodiments, a graphical output of the display  103  is responsive to inputs provided to the biometric button assembly. 
     The wearable electronic device  100  can be permanently or removably attached to the watchband  104 . The watchband  104  is configured to couple or attach the watch to a user. The watchband can be made of any suitable material, including, but not limited to, leather, metal, polymer, fabric, and composites of multiple materials. In the illustrated embodiment, the watchband is a wristband that wraps around the user&#39;s wrist. The wristband can include an attachment mechanism, such as a bracelet clasp, and magnetic connectors. In other embodiments, the watchband can be elastic or stretchable such that it fits over the hand of the user and does not include an attachment mechanism. 
     The electronic device  100  can also include one or more internal components (not shown) typical of a computing or electronic device, such as, for example, one or more processors, memory components, network interfaces, and so on. Example device components are discussed in more detail below with respect to  FIG.  5   . Although a watch is shown in  FIG.  1   , it should be appreciated that any number of electronic devices may incorporate a biometric button assembly, including (but not limited to): computers, personal digital assistants, media players, laptops, other wearable devices, touch-sensitive devices, keypads, keyboards, and so on. 
       FIGS.  2 A-B  are cross-sections of a biometric button assembly disposed in an opening of an electronic device taken along section A-A of  FIG.  1   . The biometric button assembly  210  is disposed in an opening of an enclosure  120  of an electronic device  100 . In  FIG.  2 A , the biometric button assembly  210  is depicted in a first, undepressed state. In  FIG.  2 B , the biometric button assembly  210  is depicted in a second, depressed state. Alternate embodiments of the biometric sensing system  201  of  FIGS.  2 A-B  are provided in  FIGS.  3 A-D , discussed below. 
     The biometric button assembly  210  is configured to move or displace in response to an input to the input surface  212 , e.g. a user touch to the input surface. A button housing  203  of the biometric button assembly  210  displaces into the opening  222  of the enclosure  120  to activate tactile switch  250 . The tactile switch  250  provides the user with tactile feedback as to switch operation; for example, whether the switch has been activated. The tactile switch  250  collapses when activated (as depicted in  FIG.  2 B ), and thus provides a tactile response or feedback along the button or other external surface that the switch has been activated. 
     In the present embodiment, a plunger  202  is used to actuate the tactile switch  250 . As shown in  FIGS.  2 A and  2 B , the plunger  202  is positioned below the input surface  212  and translates or displaces with displacement of the input surface  212 . The plunger  202  is positioned above the tactile switch  250 . The tactile switch  250  receives a force with movement of the plunger  202 . Once the plunger  202  displaces to a threshold distance, the tactile switch  250  collapses (compare  FIGS.  2 A and  2 B , where the tactile switch  250  has collapsed in  FIG.  2 B  from un-collapsed configuration in  FIG.  2 A .) 
     The tactile switch  250  may produce an electrical signal that may be used to activate or as user input for one of many aspects of the electronic device. For example, activation of the tactical switch  250  may modify a graphical output of the electronic device produced or displayed on the display of the electronic device. That is, the display may provide graphical output that is responsive to the switch  250 . For example, the switch  250  may be used to select or accept an option or item, change or adjust a setting, transition a user interface, and/or zoom in or out of the display. As another example, the activation of the switch  250  may be used to control a process (e.g., turn off an alarm), control hardware (e.g., change the brightness or other aspect of a display), or otherwise provide user input to the device  100 . 
     As shown in  FIGS.  2 A- 2 B , a biometric sensor  230  is positioned below the input surface  212 . Stated another way, the biometric sensor  230  is located inwards from the input surface  212 , such that the sensor  230  is positioned within the button assembly and offset inward with respect to the input surface  212 . The biometric sensor  230  senses a biometric characteristic of a user, based on user interaction with the input surface  212 . For example, the biometric sensor  230  may be a fingerprint sensor of an array of capacitive sensing elements. Upon a user touch to the input surface  212 , the biometric sensor  230  senses a change in capacitance or a value of capacitance of the array of capacitive sensing elements. The biometric sensor  230  produces an output signal that includes the sensor measurements. The output signal corresponds to a fingerprint of the user. The output signal may be processed to determine the user fingerprint. The output signal is processed by a processor positioned in an enclosed volume  221  of the electronic device. 
     A flexible conduit  240  receives the output signal of the biometric sensor  230  and provides the output signal to the processor of the electronic device  100 . The flexible conduit  240  may pass through passage  227  between the enclosed volume  221  of the electronic device  100  and interior volume  216  within the button housing  203 . 
     A seal  262  is positioned between a sealing surface  225  of the button assembly  210  and an enclosure shelf  223  of the enclosure  120  of the electronic device  100 . The seal  262  restricts ingress of contaminants from entering the enclosed volume  221  by way of the passage  227 . The flexible conduit  240  cooperates with the seal  262  to restrict ingress of contaminants from entering the enclosed volume  221  by way of the passage  227 . The seal  262  may encircle the passage  227 . 
     In the embodiment of  FIGS.  2 A-B , the flexible conduit  240  and the seal  262  form a stack that may be referred to as a seal region  209 . The flexible conduit  240  includes a portion that is disposed above or on top of the seal  262 , the seal  262  disposed or on top of the enclosure shelf  223 . The flexible conduit  240  portion stacked on top of the seal  262  is disposed below a sealing surface  225  of the button assembly  210 . In the embodiment of  FIGS.  2 A-B , a lower surface of the retainer  224  is the sealing surface  225  of the button assembly  210 . In the present example, both the seal  262  and a portion of the flexible conduit  240  encircle or surround the passage  227 . Also, in the present example, the flexible conduit  240  is stacked over the entire seal  262  and the relevant portion of the flexible conduit  240  covers or overlaps substantially all of a sealing surface of the seal  262 . This is evident from  FIGS.  2 A-B , depicting the flexible conduit  240  disposed above the seal  262  on both the left side of the plunger  202  and the right side of the plunger  202 . (Also, see  FIGS.  3 B-C  and associated discussion.) 
     Other configurations of the seal region  209  are possible. For example, a portion of the flexible conduit  240  may be positioned below the seal  262 , such that a stack is formed of seal  262  then flexible conduit  240 . In such a configuration, the seal  262  would be disposed below the lower surface of the retainer  224 . In one embodiment, the seal region  209  is a stack of a first seal, a portion of flexible conduit  240 , and then a second seal. In another embodiment, the seal  262  is overmolded about all or a portion of the flexible conduit  240  in contact with the seal  262 . In one embodiment, one or more components of the seal region  209  may be under compression when fitted below the sealing surface  225  of the button assembly  210 . 
     The biometric sensor  230  detects inputs received at the input surface  212  and provides an output signal associated with the detected input, for example, to a processor of the electronic device  100 . The biometric sensor  230  may include a set of sensing elements. The biometric sensor  230  may be partially or entirely disposed in the interior volume  216  and/or disposed on or near a surface of the button housing  203 , such as the input surface  212 . In the embodiment depicted in  FIGS.  2 A-B , the biometric sensor  230  is positioned below the input surface  212 . 
     The biometric sensor  230  may be any type of biometric sensor that provides a signal associated with a biometric characteristic of a user based on user interaction with the input surface  212 . For example, the sensor  230  may be a sensor that detects or can be used to identify a fingerprint biometric. The fingerprint biometric may be obtained by any means known in the art, to include, without limitation, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor, and an optical fingerprint sensor. In one embodiment, the biometric sensor  230  is a capacitive system which detects differences in capacitance between portions of a user&#39;s finger. A capacitor sensing area may sense or measure such a change in capacitance and output an electrical output signal. 
     The biometric characteristic, such as a fingerprint, may be used for any of several purposes, such as to provide a user authentication. A user authentication may be used in any of several ways. For example, the user authentication may be used to unlock the electronic device, to authorize a transaction, or to send an alert. A biometric button assembly may be configured, for example, as a power button, a key of a keyboard, a control button (e.g., volume control), a home button, a watch crown, and so on. 
     The biometric sensor  230  provides or outputs an output signal or a sensor measurement associated with user interaction with the button assembly  210 . The output signal may be an electrical output signal. More specifically, the sensor  230  provides or outputs a signal that is triggered or prompted by user interaction with the input surface  212 . The input surface  212  may be an input surface configured to receive a user input which may be sensed by the sensor  230 , which outputs a signal associated with a biometric of a user. For example, if the force sensor  230  is a capacitive-based sensor, measurements of voltage, capacitance and the like may be sensed by the sensor  230  and output as an electrical output signal. 
     In one embodiment, the biometric sensor is a capacitive-based sensor array of a set or group of capacitors. In one embodiment, the biometric sensor is a capacitive-based sensor of an array of capacitive sensing elements. In one embodiment, the array, or matrix, of capacitive-based sensors is fine enough to decipher the ridges and grooves of a human fingerprint. Each capacitive sensor element of the array of capacitive sensing elements measures the capacitance between the sensor element and a portion of a user finger near or touching the input surface. The differences in distance to the ridges and channels between ridges of a fingerprint may be used to produce a fingerprint. 
     The sensor  230  and at least a portion of the flexible conduit  240  are disposed within the interior volume  216 . The flexible conduit  240  is engaged with the sensor  230  such that the flexible conduit  240  receives an electrical output signal provided or output by the sensor  230 . Stated another way, the flexible conduit  240  is configured to receive the electrical output signal output or transmitted by the sensor  230 . The flexible conduit  240  transmits the electrical output signal to a processor of the electronic device  100 , the processor of the electronic device  100  disposed within the enclosed volume  221 . 
     The flexible conduit  240  receives the output signal of the biometric sensor  230  and provides the output signal to the processor of the electronic device  100 . The flexible conduit  240  may pass through passage  227  between the enclosed volume  221  of the electronic device  100  an interior volume  216  within the button housing  203 . 
     The flexible conduit  240  is configured to receive the electrical output signal output or transmitted by the sensor  230 . The flexible conduit  240  transmits the electrical output signal to a processor of the electronic device  100 . The processor of the electronic device  100  is disposed within the enclosed volume  221 . A proximal or first end of the flexible conduit  240  is disposed below the sensor  230  and within the interior volume  216 . A second or distal end of the flexible conduit  240  is disposed below the button assembly  210  and within the enclosed volume  221 . A portion of the flexible conduit  240  may pass through a seal region  209  while not compromising the integrity of the seal region  209 . Stated another way, the ability of the seal region  209  to prevent or restrict the entry of contaminants into the enclosed volume  221  and/or the interior volume  216  is not degraded or reduced because the flexible conduit  240  passes through, or forms part of, the seal region  219  by way of the passage  227 . 
     A seal  262  is positioned between a sealing surface  225  of the button assembly  210  and an enclosure shelf  223  of the opening  222  of the electronic device  100 . The seal restricts ingress of contaminants from entering the enclosed volume  221  by way of the passage  227 . The flexible conduit  240  may cooperate with the seal  262  to restrict ingress of contaminants from entering the enclosed volume  221  by way of the passage  227 . A portion of the flexible conduit  240  may form a stack with the seal  262 . In one embodiment, the seal  262  is disposed on the enclosure shelf  223 . In one embodiment, the seal  262  is disposed below the sealing surface  225  of the button assembly  210 . In one embodiment, a portion of the flexible conduit  240  is disposed between the seal  262  and the sealing surface  225 . In one embodiment, a portion of the flexible conduit  240  is disposed between the seal  262  and the enclosure shelf  223 . 
     The seal  262  may be of a substantially uniform material or a composite of more than one material, and may be manufactured of any known material that may form a water-tight seal. The one or more materials of the seal  262  may comprise any of several materials used to form a seal, including pressure-sensitive adhesives (PSA), heat activated (HAF) substances, or films including HAF silicon, polyimides (PI), rubber, and elastomeric materials. The seal  262  may form, in part or in entirety, a gasket seal, such as a compressible gasket seal. 
     The flexible conduit  240  extends from the biometric sensor  230  through the seal region  209  and to the processor disposed in the opening  222  by way of the passage  227 . The flexible conduit  240  may pass through the seal region  209  in any of several ways, such as entry from a first lateral or first side portion and exiting from a second lateral or second side portion, as depicted in  FIGS.  2 A-B . In another embodiment, the portion of the flexible conduit that passes through the seal region  209  substantially forms a plane within the seal  262 , the plane substantially parallel with the enclosure shelf  223  and/or the input surface  212 . Stated another way, a portion of the flexible conduit  240  may form a stacked configuration with the seal  262  to form a seal region  209 . In another embodiment, a first flexible conduit  240  terminates within the seal, and a second flexible conduit  240  extends from the seal to the processor, the two flexible connectors  240  in electrical communication. 
     The flexible conduit  240  may be any conduit configured to carry an electrical current or signals while remaining conformable or flexible upon bending and/or twisting. For example, the flexible conduit may be one or more electrical wires encased in plastic or silicon. The flexible conduit  240  may include a portion that conforms to a geometry of one or more components of the button assembly  210 . For example, a portion of the flexible conduit  240  may conform to the interior geometry of the button housing (e.g., see  FIG.  3 C  and associated discussion). The flexible conduit  240  may present a flat although flexible geometry that includes a conductive portion or element that is configured to transfer or communicate electrical signals. 
     The flexible conduit  240  may be formed from a flexible circuit, flexible flat cable (FFC), or other similar component or assembly. For example, the flexible conduit  240  may be formed from a flexible circuit having conductive traces formed on a flexible substrate. The flexible substrate may be manufactured from a sheet of flexible material include, but not limited to, polyimide, polyether ether ketone (PEEK), and other similar materials. A conductive film or layer may be printed, formed, or otherwise disposed on the substrate and may be patterned to define a conductive path or line. The flexible conduit  240  typically includes multiple conductive paths or lines, each configured to conduct or communicate a separate electrical signal. The flexible conduit  240  may include a terminal or connector that facilitates electrical and structural connection with another component or element. 
     In some embodiments, the flexible conduit may perform some processing of the data output from the biometric sensor  230  prior to outputting or transmitting the data to the processor of the electronic device  100 . For example, the flexible conduit may filter the received data from the biometric sensor  230  such that only activated sensor elements of a multi-sensor biometric sensor  230  are transferred. Such a scenario occurs when the biometric sensor  230  is a matrix of capacitive sensor elements, in which only a fraction of the capacitive sensor elements are activated by a user touch. By only transmitting data associated with activated sensor elements, communication bandwidth is reduced. Also, the processor of the electronic device receives reduced data to process, thereby reducing computation time for fingerprint identification. As described above, the processor may apply the biometric identification for any of several purposes; for example, user identification, device unlocking, and application authorization. In some embodiments, the processor may also instruct the biometric sensor  230  to capture a biometric datum from the user. 
     The button housing  203  of the biometric button assembly  210  displaces into the opening  222  of the enclosure  120  to activate the tactile switch  250 . The enclosure  120  has a sidewall partially defining an enclosed volume  221 , an opening  222  formed in the sidewall of the enclosure  120 , an enclosure shelf  223  formed at a lower or distal portion of the opening  222 , and a passage  227  extending from the opening to the enclosed volume  221 . 
     The passage  227  may be configured to receive or pass a portion of the flexible conduit  240  from the opening  222  to the enclosed volume  221 . Any of several components may be positioned in the enclosed volume  221  to include a processor. The passage  227  between the enclosed volume  221  and the opening of the enclosure  120  is configured so that the sensor  230  and components of the electronic device  100  (e.g., a processor) may be operably coupled to facilitate communication or user interaction. For example, a display of the electronic device may be operably coupled to the processor. In the example of  FIGS.  2 A-B , the flexible conduit  240  is coupled to the biometric sensor  230  and extends through the passage  227  and into the enclosed volume  221 . The flexible conduit  240  is illustrated as a flex cable. 
     The biometric button assembly  210  includes a button housing  203  that forms an exterior structure of the biometric button assembly  210 . The button housing  203  defines an interior volume  216 . The exterior structure of the biometric button assembly  210  includes input surface  212  and housing wall  234 . The input surface  212  extends to a perimeter edge of the biometric button assembly  210 . The housing wall  234  extends from the perimeter edge of the biometric button assembly  210  into the opening  222  of the electronic device  100 . The input surface  212  and the housing wall  234  define an interior volume  216  of the button assembly  210 . The interior volume  216  is adapted to receive any of several other components, to include a sensor  230  and a flexible conduit  240 . 
     As described above, the plunger  202 , positioned below the input surface  212 , displaces with displacement of the input surface  212 . The plunger  202  is positioned above the tactile switch  250  and may actuate the tactile switch  250  when the input surface  212  is displaced. As shown in  FIGS.  2 A- 2 B . 
     The plunger  202  is configured to engage a retainer  224  within an axial aperture of a central portion of retainer  224 . The retainer  224  is axially aligned with the plunger  202 . The retainer  224  is at least partially disposed in the interior volume  216  of the button housing  203 . The retainer  224  holds the plunger  202  in a stable vertical position and allows an axial displacement of the plunger  202  such that a tactile dome switch  250  may be activated. The retainer  224  may be manufactured of any rigid or semi-rigid material, to include metals and hardened plastics. A plunger O-ring  204  is fitted around a central portion of the plunger  202 . The plunger  202  displaces upon a user input to the input surface  212 , as shown by comparing  FIG.  2 A , in which the plunger is not displaced, and  FIG.  2 B , in which the plunger is displaced. 
     In the embodiment of  FIGS.  2 A-B , the retainer  224  includes a lower surface that forms a sealing surface  225  of the button assembly  210 . Specifically, a lower surface of the retainer  224  may form a sealing surface  225  of the button assembly  210 , the sealing surface  225  engaged with or contacting either the seal  262  or a portion of the flexible conduit  240 . 
     The button housing  203  may translate or displace within the opening  222  by slightly displacing the plunger  202  against the tactile switch  250 . For example, with respect to  FIGS.  2 A-B , the button housing  203  translates or displaces to the left-right against the plunger  202  in response to a user input. Tactile dome switch  250  activates upon movement or displacement of the plunger  202 . Once the plunger  202  displaces to a threshold distance, the tactile switch  250  collapses.  FIG.  2 A  depicts the tactile switch  250  in an unactivated or uncollapsed state.  FIG.  2 B  depicts the tactile switch  250  in an activated or collapsed state. 
     The opening  222  extends to an enclosure shelf  223  adapted to receive the button housing  203  and the switch  250 . The switch  250  may be incorporated or assembled to a printed circuit board (PCB) that is affixed to the enclosure shelf  223  by an adhesive or fastener. The PCB may include electrical terminals and electrical routing elements for electrically coupling the switch  250  with other elements or components of the device. 
     The tactile dome switch  250  may be any type of switch known to those skilled in the art, to include a metal or rubber dome switch. A tactile dome switch compresses in response to an applied force. Upon reaching a threshold level of compression, the tactile dome switch  250  buckles and makes an electrical contact. The electrical contact closes the switch, which may be transmitted as an electrical signal or detected as an electrical activation. An electrical connector is connected to the tactile dome switch  250  to receive and transfer the output from the tactile dome switch  250 . As previously discussed, components of the electronic device  100 , such as the display, may respond to an activation of the tactile dome switch  250 . 
     In one embodiment, the biometric sensing system  201  may be configured to activate in response to an input force to an input member of the biometric button assembly  210  which is of negligible magnitude or to the near proximity of a user. Such an operational mode may be enabled by any of several types of proximity sensors located on or adjacent to the input member of the button assembly  210 . For example, when an object, e.g., a user finger, approaches the input surface  212  of the button assembly  210 , the object may be detected by a proximity sensor, resulting in a signal used to activate the biometric sensing system  201 . In one embodiment, the sensor  230  may nominally remain off until the proximity sensor is activated. Such a configuration allows power to be conserved, for example, in that the sensor  230  is only activated when a user is adjacent the proximity sensor and/or adjacent the button assembly  210 . Sample proximity sensors include capacitive sensors, optical sensors, Hall Effect sensors, ultrasonic sensors, and so on. In some embodiments, the proximity sensor may be a touch sensor. 
     In some embodiments, the proximity sensor may be fitted to or incorporated into the housing wall  234 , to include a housing wall  234  configured as a trim surface. In one embodiment, the housing wall  234  is a conductive material. In one embodiment, the proximity sensor is disposed within the interior volume  216  and/or is embedded in the input surface  212 . The button assembly  210  is at least partially disposed in an opening  222  of an electronic device  100 . As shown in  FIGS.  2 A-B , the button assembly  210  may be positioned to protrude from a surface of the enclosure  220 . 
     The physical profile of the button assembly  210  may be of any of several configurations, to include substantially planar or flat, convex, and concave. In one embodiment, the input surface is an input member, such as a touch screen. The input surface  212  extends to a perimeter edge of the button assembly  210 . A housing wall  234  extends from the perimeter edge of the button assembly  210  into the opening  222 . Although the housing wall  234  is shown in  FIGS.  2 A-B  as a straight cross-section, other geometries are possible. For example, the housing wall  234  may form a straight cross-section with a cut-out to retain an O-ring seal. In one embodiment, the housing wall  234  is a trim surface that is matched to the look and/or feel of the enclosure  220 . For example, the housing wall  234  may be manufactured of the same material (e.g., a metal alloy) as the enclosure  220 , present the same color as the enclosure  220 , and/or present the same texture (e.g. roughness) as the enclosure  220 . In some embodiments, the housing wall  234  may be manufactured of a complementary material to the enclosure  220 , or manufactured of a material not the same as the enclosure  220 . 
       FIG.  3 A  is a cross-section of a biometric button assembly disposed in an opening of an electronic device taken along section A-A of  FIG.  1   . The biometric button assembly  310  is disposed in an opening of an enclosure  120  of an electronic device  100 . The biometric button assembly  310  is depicted in a first, undepressed state. The biometric button assembly  310  may operate in a second, depressed state (not shown). The embodiment of the biometric button assembly  310  of  FIG.  3 A  is an alternative design of the embodiment of the biometric button assembly  210  of  FIGS.  2 A-B . 
     Generally, the biometric button assembly  310  is configured to move or displace in response to an input to the input surface  212 , e.g. a user touch to the input surface. A button housing  303  of the biometric button assembly  310  displaces into the opening  222  of the enclosure  120  to activate tactile switch  350 . The tactile switch  350  provides the user with tactile feedback as to switch operation; for example, whether the switch has activated. The tactile switch  350  collapses when activated, and thus provides a tactile response or a sense of touch to the user that the switch has been activated. 
     The biometric button assembly  310  defines an input surface  212  on the exterior of the biometric button assembly  310  for receiving inputs, such as inputs from users (e.g., touches, presses, and the like). Inputs may include presses, touches, or other interactions between a user and the input surface  212 . The button assembly  310  includes a cover glass  316 , such as sapphire. The cover glass  316  may be an input member with input surface  212 , as discussed previously with respect to the embodiment of  FIGS.  2 A-B . A biometric sensor  330  is positioned below the input surface  212 . Stated another way, the biometric sensor  330  is located inwards from the input surface  212 , such that the sensor  330  is positioned within the button assembly and offset inward with respect to the input surface  212 . The biometric sensor  330  detects inputs received on the input surface  212 . A flexible conduit  340  receives an output signal from the sensor  330  and transmits the output signal to a processor of the electronic device  100 . 
     The upper portion of the button assembly  310  includes a stack of several components. The stack of components will be described from the exterior of the button assembly  310  inward. An input surface  212  defines an upper input surface of the button assembly  310 . The input surface  212  is formed on the upper surface of the cover glass  316 . Biometric sensor  330  is disposed below cover glass  316 . Biometric sensor  330  is disposed within an upper portion of encapsulant  333 . The encapsulant  333  is disposed above an upper stiffener  314 . Lastly, the upper stiffener  314  is disposed above and is connected to the plunger  202 . In one embodiment, the encapsulant is overmolded around the sensor die  311 . 
     Biometric sensor  330  is depicted in  FIG.  3 A  to highlight the sensor  330  component elements of sensing elements  308  and sensor die  311 . The sensor  330  may include one or more of the biometric sensor types discussed above, to include capacitive, optical, and ultrasonic. The sensing elements  308  are the active sensing components of a particular biometric sensor  330 . For example, if the biometric sensor  330  is a multi-capacitor sensor, the sensing elements  308  are the capacitive plate elements that, together, form a matrix of capacitive sensing elements. The sensor die  311  is shaped or configured to snuggly fit or securely retain the sensing elements  308 . In one embodiment, the sensor die  311  forms an interference fit with the sensing elements  308 . 
     The sensor die  311  retains the sensing elements  308  in a substantially planar configuration such that sensing of a user input may be performed. For example, if the sensor  330  was a self-capacitive system, upon a user touch to the input surface  212 , a change in capacitance between one or more of the sensing elements  308  and the user finger would occur. One or more of the sensing elements  308  would sense or measure such a change in capacitance and output an electrical output signal, as discussed above. The measure of capacitance varies with the distance between the sensing area and the user finger. If a fine array of capacitive sensors were positioned within the sensor die to form the sensing elements  308 , the differences in distance to a ridge of a fingerprint and channels between ridges of a fingerprint could be detected. A collection of such capacitance measures allows a fingerprint to be constructed. 
     Sensor die  311  is disposed within encapsulant  333 . The encapsulant  333  encloses and protects the sensor die  311  and the sensing elements  308 . A perimeter of the encapsulant  333  may engage a lower surface of the cover glass  316 , thereby enclosing or sealing the sensor  330 . The encapsulant  333  may protect the sensor  330  from, among other things, humidity, temperature changes, vibration, and mechanical shock such as caused by dropping of the electronic device  100 . The encapsulant  333  may be any encapsulant or electrical potting compound known to those skilled in the art, to include polyurethanes, epoxies, silicones, and other polymers. 
     Upper stiffener  314  is disposed between the encapsulant  312  and the plunger  202 . Stated another way, the upper stiffener is disposed below a lower surface of the encapsulant  333  and disposed above an upper surface of the plunger  202 . The upper stiffener  314  is formed of a rigid material, such as metal or hardened plastic. The upper stiffener  314  helps to distribute the contact force and/or contact load applied to the sensor  330  during operation of the plunger  202 . 
     The flexible conduit  340  receives the output signal from the biometric sensor  330  and transmits the output signal to a processor within the electronic device. A first or proximal end of the flexible conduit  340  is engaged with at least a portion of the encapsulant  333 . In the embodiment of  FIG.  3 A , the proximal end of the flexible conduit  340  is disposed within a lower portion of the encapsulant  333 . In such a configuration, the proximal end of the flexible conduit  340  remains fixed and in a predictable distance and orientation with respect to the sensor  330 . 
     The flexible conduit  340  receives an electrical output signal generated and output by the sensor  330  and transmits the electrical output signal to a processor of the electronic device  100 . The flexible conduit  340  runs from below the sensor  330 , along an edge of the button assembly  310 , to below the button housing  303 . At the distal end of the flexible conduit  340 , an electrical connection connects the flexible conduit  340  with a system connector  306 . The system connector  306  receives data or electrical output signals from the system connector  306  and outputs the electrical output signals to a processor of the electronic device  100 . 
     The second or distal end of the flexible conduit  340  connects with the system connector  306  through a hot bar connector  322 . The hot bar connector  322  provides an electrical connection between the flexible conduit  340  and the system connector  306 . The phrase “hot bar” means a connection obtained through a pulsed heat thermode soldering technique resulting in a permanent electro-mechanical connection. The hot bar connector  322  may be a hot bar connection or any other connection known to those skilled in the art that provides a reliable electrical connection. 
     In the embodiment of  FIG.  3 A , the retainer  224  is of stepped design, with a lowest step providing a stop to displacement of the button housing  303 . Other configurations of the retainer  224  are possible, to include a sloped design (such as that of  FIGS.  2 A-B .) The retainer  224  lower surface forms a sealing surface  225  for the button assembly  310 . 
     The retainer  224  is disposed on a portion of the flexible conduit  340 . Stated another way, the sealing surface  225  of the retainer  224  is disposed on a portion of the flexible conduit  340 . A portion of the flexible conduit  340  disposed below the sealing surface  225  of the retainer is disposed on a face seal  318 . The face seal  318  is in turn disposed on a static seal  320 . In some embodiments, only one of face seal  318  and static seal  320  are provided. For example, the sealing surface  225  of the retainer is disposed on a portion of the flexible conduit  340 , a portion of the flexible conduit  340  in turn disposed or either the face seal  318  or the static seal. In another embodiment, the stack of seals and flexible conduit are in a different sequence. For example, from sealing surface  225  of the retainer  224  toward the enclosed volume, the stack may be face seal  318 , flexible conduit  340 , then static seal  320 . 
     Alternatively, the stacked sequence may be face seal  318 , static seal  320 , then flexible conduit  340 , or any sequence combination of face seal  318 , static seal  320 , and flexible conduit  340 . Additionally, one or more adhesives may be used to bond the above layers together. For example, an adhesive may be fitted between face seal  318  and static seal  320  or between other combinations of layers. In one embodiment, the face seal  318  is a gasket seal. The face seal  318  may be a pressure-sensitive adhesive (PSA). In one embodiment, the static seal  320  is a gasket seal. The static seal  320  may be a pressure-sensitive adhesive (PSA). 
     In the present example, the face seal  318 , static seal  320 , and a portion of the flexible conduit  340  encircle or surround the passage  327 . Also, in the present example, the flexible conduit  340  is stacked over the face seal  318  and the static seal  320 , and the relevant portion of the flexible conduit  340  covers or overlaps substantially all of a sealing surface of the face seal  318  and the static seal  320 . 
     In one embodiment, a portion of the flexible conduit  340  is fitted within a layer of seals and/or PSA to form a seal region  309 . For example, PSA may be applied to both an upper and a lower surface of the distal end of the flexible conduit  340 , such that the upper PSA portion connects with the sealing surface  225  of the retainer  224  and the lower PSA portion connects with the enclosure shelf of the opening  222 . In another example, a gasket seal (such as face seal  318 ) may further be applied below the lower PSA portion, such that a sandwich, from outside the button assembly inwards, is formed of PSA, flexible conduit  340 , PSA, and then the gasket seal. In one embodiment, one or more seals are insert molded around the flexible conduit  340 . In one embodiment, one or more seals are face sealed against the flexible conduit  340 . In one embodiment, one or more seals are adhered to the flexible conduit  340  using pressure-sensitive adhesives. In one embodiment, all or part of the seal region is overmolded around all or part of the flexible conduit  340  that passes into or through the seal region. 
     In one embodiment, the one or more parts fitted between the sealing surface  225  of the button assembly  310 , such as the lower surface of the retainer  224 , and the enclosure shelf may be termed a seal region  309 . The seal region restricts entry or ingress of contaminants into the enclosed volume  221  by way of passage  327 . The components which form the seal region  309  may be a substantially parallel stack of components, as described above. In other embodiments, the seal region may be any one or more components that restrict entry or ingress of contaminants into the enclosed volume  221 . As shown in  FIGS.  3 A and  3 D , the seal region  309 , including the face seal  318 , static seal  320 , and relevant portion of the flexible conduit  340 , encircles or surrounds the passage  327  to prevent or reduce the ingress of contaminants into the enclosed volume  221  of the enclosure  120 . The seal region  309  including the various components also surrounds the tactile dome  350  and other electronic or electrical components of the switch, which may protect those components from contaminants, as well. 
     The button assembly  310  includes a plunger  202 , the plunger  202  in turn connected to a switch  350 . The plunger  202  is axially aligned within the button assembly  310 . With movement of the button assembly  310 , the plunger  202  translates or displaces, resulting in activation of the switch  350 . The plunger is fitted in a central groove to receive a plunger O-ring  204 . The plunger O-ring  204  is configured to engage with a retainer  224 , discussed with regard to  FIGS.  2 A-B . An upper portion of the plunger  202  may be attached to a lower portion of the upper stiffener  314 . In one embodiment, the upper portion of the plunger  202  is attached to the lower portion of the upper stiffener  314  with an adhesive or other attachment device or mechanism. 
     The switch  350  is disposed on a printed circuit board (PCB)  325 , which is in turn disposed on a bracket  324 . The bracket  324  is a rigid component that provides structural support to the PCB  325  and to the switch  350 . The PCB  325  includes electrical connections to receive electrical activation signals from the switch  350 , and may hold other electrical components. The bracket  324  may be disposed on a shelf within the opening  222  of the electronic device  100 . 
       FIG.  3 B  is an exploded view of portions of the embodiment of a biometric sensing system  301  of  FIG.  3 A .  FIG.  3 C  is a close-up of two components of  FIG.  3 B  fitted together. In  FIG.  3 B , nine portions of the biometric sensing system  301  are shown. Generally, the components of the biometric sensing system  301  interlock. The stack of components will be described in a descending direction from the exterior of the button assembly downward, and from left to right in  FIG.  3 B . 
     The cover glass  316  fits with or is conformal with an assembly of the encapsulated sensor die, sensor elements, and the flexible conduit  340 . The encapsulated sensor die and the sensing elements are depicted as assembled to the partially encapsulated flexible conduit  340 , and not depicted separately. Note that the portion of the flexible conduit  340  that is not encapsulated is the portion that runs along an outer portion of the button housing  303  and connects with the system connector  306 . A system connector  306  may include another separate flexible circuit or conduit that is electrically coupled to the flexible conduit. The system interconnect  306  may include a set of interconnects, such as circular interconnects or linear interconnects and may provide an electrical connection between the flexible conduit  340  and the system connector  306 . For example, the system interconnect may be an electrical connector, such as an encased wire. The system interconnect  306  may replace or supplement the hot bar connector  322 . The assembly of encapsulated sensor die, sensing elements, and flexible conduit  340  fit within button housing  303  and rest on a shelf of the button housing  303 , as shown in  FIGS.  3 A-B . 
       FIG.  3 C  depicts an assembly of the flexible conduit  340  fitted to the button housing  303 . The flexible conduit  340  may include an upper portion  339  that is connected to the sensor  330 . (See  FIG.  3 A .) A second or sealing portion  341  of the flexible conduit  340  is coupled to the first portion  339  by a folded portion  343 . The sealing portion  341  may be generally flat and may interface with the seal to form a seal region, as described above with respect to  FIG.  3 A . One or more openings or apertures formed in the sealing portion  341  may be configured to encircle the plunger, the passage, or other feature or element of the button assembly or device. As described previously, by encircling or surrounding the passage or various components, the flexible conduit  340 , specifically the sealing portion  341 , may prevent or reduce ingress of contaminates for those components or regions of the device. A folded conduit portion  343  connects first conduit end  339  and second conduit end  341  and may be configured to bend, flex, or fold in accordance with the operation of the switch. The folded conduit portion  343  may be of smaller width then the width of one or both of first conduit end  339  and second conduit end  341 . The folded conduit portion  343  may be configured with multiple folds, so as to form an accordion configuration, as depicted in  FIG.  3 C . 
     Returning to  FIG.  3 B , plunger  202 , with plunger O-ring seal  204 , fit within a central aperture of retainer  224 . After folding the flexible conduit  340  such that second conduit end  341  is aligned and fitted below lower surface of retainer  224 , face seal  318  fits below second conduit end  341 . Static seal  320  is depicted already attached to face seal  318 . Retainer  224  is depicted with a central hole to allow passage of plunger  202  and switch  350 . Lastly, bracket  324  is shown to form a lower component of the biometric sensing system  301 . Note further that lower bracket  324  is depicted with two fasteners that engage with two outer holes in retainer  224 . 
       FIG.  3 D  is a sample cross-section view of the electronic device  100  of  FIG.  1   , taken along section A-A in  FIG.  1    and showing another embodiment of a biometric sensing system  301 . The embodiment of  FIG.  3 D  is similar to the embodiment of  FIGS.  3 A-B  except that the configurations of some components are different. Specifically, the flexible conduit  340  and associated connections, the configuration of the stiffener  314 , and the seal region  309  are different. 
     Stiffener  314  is shown with additional thickness at outer areas. The additional structural thickness will increase the rigidity of the stiffener, such that a relatively less degree of rotational movement may occur during vertical displacement of the button housing  310 . 
     The upper positioning of the flexible conduit  340  is extended in the embodiment of  FIG.  3 D  relative to that of  FIGS.  3 A-B . The first or proximal end of the flexible conduit  340  extends across substantially the entire horizontal portion of the encapsulant  333 . This configuration provides more overlapping between the flexible conduit  340  and the sensor  330 . Such increased overlapping area may allow additional electrical output signal processing to occur at the proximal end of the flexible conduit  340 , and/or allow increased robustness in electrical output signal transfer between the flexible conduit  340  and the sensor  330 . 
     The lower positioning of the flexible conduit  340  is outside of the opening  222  of the electronic device  100  in the embodiment of  FIG.  3 D . The flexible conduit  340  runs from below the sensor  330 , along an edge of the button assembly  310 , to below the retainer  224 . 
     The second or distal end of the flexible conduit  340  forms a portion of seal region  309 . The distal end of the flexible conduit  340  is disposed below both the static seal  320  and the face seal  318 . The distal end of the flexible conduit  340  connects with the system connector  306  through the hot bar connector  322 . A seal region  309  is formed by a stack of seals and the distal end of the flexible connector  340 . More specifically, a stack is formed of face seal  318 , static seal  320 , and flexible conduit  340 . The hot bar connector  322  connects the distal end of the flexible conduit  340  and the system connector  306 . 
       FIGS.  4 A-B  are cross-sections of a biometric button assembly disposed in an opening of an electronic device taken along section B-B of  FIG.  1   . The biometric button assembly  410  is disposed in an opening of an enclosure  120  of an electronic device  100 . In the embodiment of  FIG.  4 A , the button assembly  410  is stationary and includes a biometric sensor  430 . The biometric sensor  430  produces an output signal in response to a user touch to a button input surface  212 . The output signal corresponds to a biometric characteristic of a user, such as a fingerprint. A flexible conduit  440  transmits the sensor data to a processor positioned inside the electronic device. The button assembly  410  also includes a touch sensor configured to detect an input to the button input surface  212 . The touch sensor includes a lower capacitive plate  420  which produces a signal indicating a user touch to the input surface  212 . The button is sealed by an O-ring seal  414  positioned between the button housing  403  and an enclosure  120  of the electronic device. 
     The button housing  403  of the biometric button assembly  410  includes a biometric sensor  430  configured to detect a biometric characteristic of a user. The biometric sensor  430  is coupled to an input surface  212  disposed on a button housing  403  of the button assembly  410 . A flexible conduit  440  is operable to couple the sensor  430  to a processor of the electronic device by transmitting signals from the sensor to the processor. The processor is positioned in an enclosed volume  421  of the enclosure  120  of the electronic device. The flexible conduit  440  passes from an interior volume  424  of the button housing  403  to the enclosed volume  421  of the enclosure  120  by way of passage  427 . 
     The biometric sensor  430  is similar to the sensors  230  and  330  discussed with respect to  FIGS.  2 - 3   . An input surface  212  is positioned above the biometric sensor  430 . The biometric sensor  430  senses a biometric characteristic of a user, based on user interaction with the input surface  212 . In various embodiments, the biometric button assembly may be used to determine a biometric characteristic. 
     The biometric sensor  430  detects inputs received at the input surface  212  and provides an output signal associated with the detected input, for example, to a processor of the electronic device  100 . More specifically, the sensor  430  provides or outputs a signal that is triggered or prompted by user interaction with the input surface  212 . For example, the input surface  212  may be an input surface configured to receive a user input which may be sensed by the sensor  430 , the sensor  430  sensing or outputting a signal associated with a biometric of a user. 
     The sensor  430  may be any type of biometric sensor that provides a signal associated with a biometric of a user. For example, the sensor  430  may be a sensor that provides a fingerprint biometric. The fingerprint biometric may be obtained by any means known in the art, to include, without limitation, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor, and an optical fingerprint sensor. For example, the sensor  430  may be a self-capacitive fingerprint sensor made of an array of capacitive sensing elements. Each of the sensing elements measure the capacitance between the sensing element and a particular portion of a user finger touching the input surface  212 . The array, or matrix, of capacitive-based sensors may be fine enough to decipher the ridges and grooves of a human fingerprint. The differences in capacitance to the ridges and grooves of a fingerprint may be used to produce a fingerprint. 
     A flexible conduit  440  receives the output signal of the biometric sensor  430  and provides the output signal to the processor of the electronic device  100 . The flexible conduit  440  may pass through passage  427  between the enclosed volume  421  of the electronic device  100  and the interior volume  424  within the button housing  403 . A proximal or first end of the flexible conduit  440  is disposed below the sensor  430  and within the interior volume  424 . A second or distal end of the flexible conduit  440  is disposed below the button assembly  410  and within the enclosed volume  421 . 
     The button assembly  410  also includes a touch sensor configured to detect an input to the button input surface  212 . The touch sensor includes a lower capacitive plate  420 , which produces a signal indicating a user touch to the input surface  212 . The touch sensor and lower capacitive plate  420  may be configured in any of several ways to detect a touch. Generally, the touch sensor may operate independently from the biometric sensor  430  or in cooperation with the biometric sensor  430 . 
     The touch sensor may operate independently from the biometric sensor  430  by using the lower capacitive plate  420  to detect a change in capacitance with a capacitive element positioned above the lower capacitive plate  420 . The lower capacitive plate  420  may detect a capacitive virtual ground effect caused by a user touch (or near touch) to the input surface  212 . The measured change in capacitance is identified by the lower capacitive plate  420 , producing an output signal from the lower capacitive plate  420 . The lower capacitive plate  420  output signal is transmitted to the processor of the electronic device by flexible conduit  440 ′ as will be described in more detail with respect to  FIG.  4 B , the input surface  212  may displace and/or deflect relative to the lower capacitive plate  420 . Such a change in relative distance causes a change in capacitance between the user finger and the lower capacitive plate  420 , which may be equated to a touch on the input surface  212 . 
     The touch sensor may operate in cooperation with the biometric sensor  430 . For example, if the biometric sensor  430  is a capacitive-based sensor, then a capacitor of the biometric sensor  430  and the lower capacitive plate  420  may form a two plate capacitive gap sensor. The capacitor of the biometric sensor  430  and the lower capacitive plate  420  may also cooperate to form a mutual capacitance system. A change in capacitance will occur when the distance between the biometric sensor  430  and the lower capacitive plate  420  changes, either due to movement or deflection of the input surface  212 . 
     The output of the lower capacitive plate  420  of the touch sensor is provided to flexible conduit  440 ′. Flexible conduit  440 ′ receives the output signal of the lower capacitive plate  420  of the touch sensor and provides the output signal to the processor of the electronic device  100 . The flexible conduit  440 ′ passes through passage  427  between the interior volume  424  of the button housing  403  and the enclosed volume  421  of the electronic device  100 . A proximal or first end of the flexible conduit  440 ′ is disposed below the lower capacitive plate  420  and within the interior volume  424 . A second or distal end of the flexible conduit  440 ′ is disposed below the button assembly  410  and within the enclosed volume  421 . 
     Both the lower capacitive plate  420  and the flexible conduit  440 ′ are mounted to shelf  422 . The shelf  422  may be attached to the button housing  423  by a laser weld or other joining technique. The shelf  422  may be separated from the enclosure  120  by a gap and/or may be separated by the isolation sheet  415 . 
     An electrical isolation sheet  415  is positioned against a housing shelf of the button housing  403  such that when the button assembly  410  is installed in an electronic device, the button assembly  410  is electrically isolated from the electronic device. In one embodiment, the electrical isolation sheet  415  additionally or alternatively functions as a seal to inhibit the entry of contaminants into the electronic device and/or the button housing. For example, the electrical isolation sheet  415  may be a gasket made of rubber, plastic, or another suitable material. 
     The button assembly  410  engages an opening of an electronic device  100 . The electronic device  100  includes an enclosure  120  which defines an enclosed volume  421 . An opening  222  may be connected to the enclosed volume  421  by way of passage  427 . The enclosed volume  421  of the electronic device  100  may include components such as a processor, data storage memory, and the like. An O-ring seal  414  is fitted between the button assembly  410  and the opening  222  in order to prevent or restrict the entry of contaminants into the enclosed volume  421  and/or the opening  222 . 
     The button assembly  410  further includes a housing wall  423  extending from a perimeter edge of the input surface  212 . The input surface  212 , housing wall  423 , and housing shelf  405  define the button housing  403 . The housing shelf defines a lower end of the button assembly. The housing wall  423  may comprise a trim portion. The trim portion may be configured with characteristics similar to that of the adjacent portion of the electronic device  100 . For example, the trim portion may be of the same color, texture, and/or material composition as the adjacent portion of the electronic device  100 . The housing wall  423  is configured with a perimeter channel to receive the O-ring seal  414 . 
     The O-ring seal  414  contacts the housing wall  423  of the biometric button assembly  410  and the opening  222  of the enclosure  120  such that contaminants are inhibited from entering the enclosure  120  and the interior volume  424  of the button housing  403 . The O-ring seal  414  is disposed between the housing wall  423  and the opening  222 . The O-ring seal  414  restricts and/or prevents contaminants from entering the enclosed volume of the electronic device  100  by way of passage  427 . The O-ring seal also restricts and/or prevents contaminants from entering the interior volume of the button assembly  410 . More specifically, the O-ring seal restricts and/or prevents contaminants that may enter a gap between the housing wall  423  and opening  222  and thus enter one or both of the enclosed volume  421  of the electronic device  100  and the interior volume  424  of the button assembly  410 . 
     The O-ring seal  414  may be manufactured of any known sealing material. For example, the O-ring seal  414  may be formed of materials such as rubber and elastomeric materials. In one embodiment, the O-ring seal  414  forms a water-tight seal. “Water-tight seal,” as used herein, may be used to refer to a seal that prevents water entering an area of interest. 
     Button housing  403  is attached to electronic device  100  by way of fasteners  402 . In the embodiment depicted, the fasteners  402  are screws. Other retaining means are possible, to include press fits, clamps, and adhesives. The fasteners  402  are fixed to the electronic device  100  such that a portion of each fastener extends into the button housing  403 . More specifically, the fastener engages the housing shelf  405  of the button housing  403 . In one embodiment, fasteners  402  are made of a non-conductive material, such as a resin or a plastic. In another embodiment, the fasteners  402  are of a metallic material. 
     In one embodiment, a seal is positioned between the button housing and a surface of the opening of the enclosure. The seal inhibits the entry of contaminants into the electronic device. In such an embodiment, the fasteners  402  attaching the button housing  403  to the enclosure place the seal in compression. In one embodiment, the seal is the electrical isolation sheet  415 . 
     With attention to  FIG.  4 B , more detail of the biometric sensing assembly  410  is provided. The biometric sensor  430  is depicted with components of sensing elements  408  and sensor die  411 . The sensing elements  408  are the active sensing components of a particular biometric sensor  430 . For example, as discussed with respect to  FIGS.  3 A-B , if the biometric sensor  430  is a multi-capacitor sensor, the sensing elements  408  are the capacitive plate elements that, together, form a matrix of capacitive sensing elements. The sensor die  411  is shaped or configured to snuggly fit or securely retain the sensing elements  408 . In one embodiment, the sensor die  411  forms an interference fit with the sensing elements  408 . 
     The sensor die  411  retains the sensing elements  408  in a substantially planar configuration. Sensor overmold  433  is disposed below sensor die  411 . In some embodiments, sensor overmold  433  may at least partially hold or encircle sensor die  411 . 
     An input member  412  may be disposed above biometric sensor  430  and extend across the top surface of the button housing  403 . The input member  412  may be capable of deflecting, or otherwise moving, relative to the lower capacitive plate  420 . The input member  412  may move or deflect in response to a user touching or pressing on the input surface  212 . In one embodiment, the input member  412  is a cover glass, such as sapphire. 
     In one embodiment, the input member  412  includes a first or upper layer that matches the housing wall  423 . For example, the upper layer of the input member  412  may be of the same material, or appear to be of the same material, as the housing wall  423 . In one embodiment, the input member  412  includes a second layer positioned below the first layer, the first layer being a cover glass, such as a sapphire cover glass. 
     System interconnects  426  are disposed below the sensor overmold  433 . The system interconnects  426  electrically connect the signals output from the sensing elements  408  to the flexible conduit  440 . The flexible conduit  440  bends downward into the interior volume by way of passage  427 , ultimately connecting to a processor of the electronic device  100 . 
     The system interconnects  426  and the flexible conduit  440  are positioned within or in contact with a compressible layer  404 . The compressible layer  404  compresses to allow slight deflection and/or displacement of the input member  412 . Stated another way, the compressible layer  404  is compressible, thereby enabling the input member  412  to slightly displace or bend toward the interior volume  424 . 
     In one embodiment, the compressible layer  404  is a heat activated (HAF) silicon sandwich. The HAF silicon sandwich is a stack of the following five elements: heat activated film, polyimide (PI), silicon, heat activated film and the flexible conduit  440 . Other configurations of the aforementioned elements are possible in other embodiments, to include, for example, heat activated film, PI, then flexible conduit, and any other combination or sequence of the elements. In other embodiments, the compressible layer  404  is made of any combination of the above materials. System interconnects  426  may be positioned within all or a portion of the compressible layer  404 . 
       FIG.  4 C  is a sample assembly drawing of portions of the embodiment of a biometric sensing system  401  of  FIG.  4 B . The stack of components will be described in a descending direction from the exterior of the button assembly downward, and from right to left in  FIG.  4 C . Generally, the components of the biometric sensing system  401  interconnect. 
     Input member  412 , which may be a sapphire cover glass, fits over sensing elements  408  as fitted to sensor die  411 . The assembly of sensor die  411  and sensing elements  408  then fit to sensor overmold  433 . Sensor overmold  433  is in turn disposed on compressible layer  404 , which in turn fits to a housing shelf of button housing  403 . O-ring seal  414  fits around a perimeter of button housing  403 . Lower capacitive plate  420 , with a portion of flexible conduit  440 ′, fits below the button housing  403 . Next, electrical isolation sheet  415  engages a lower portion of the button housing  403 . Lastly, fasteners  402  secure the button housing  403  to the enclosure  120  of the electronic device  100 . 
       FIG.  4 D  is another sample assembly drawing of the completed button assembly  410  fitted to the electronic device  100  by way of fasteners  402 . The fasteners  402  pass through the enclosure  120  to secure the button assembly  410  to the enclosure  120 . Other configurations of securing the button assembly  410  to the enclosure  120  are possible, to include use of other attachment devices, such as adhesives. In one embodiment, the button assembly is secured to the enclosure  120  by an interference fit. 
       FIG.  4 E  is a sample cross-section view of the electronic device  100  of  FIG.  1   , taken along section B-B in  FIG.  1    and showing another embodiment of a biometric sensing system  401 . The embodiment of  FIG.  4 E  is similar to the embodiment of  FIG.  4 B , except that the configuration of the flexible conduit  440  is altered. Specifically, the flexible conduit  440  travels in a serpentine manner from below the sensor overmold  433  (the same starting configuration as the flexible conduit  440  of  FIG.  4 B ), to below the lower capacitive plate  420  (the same location as flexible conduit  440 ′ of  FIG.  4 B ), then bending downward into the interior volume  42 , ultimately connecting to a processor of the electronic device  100 . 
       FIG.  5    is an illustrative block diagram  550  of an electronic device  100  as described herein. The electronic device can include a display  516 , one or more processing units  500 , memory  502 , one or more input/output (I/O) devices  504 , one or more button assemblies  506 , a power source  508 , and a network communications interface  510 . 
     The display  516  may provide an image or graphical output (e.g., computer-generated image data) for the electronic device. The display may also provide an input surface for one or more input devices, such as, for example, a touch sensing device and/or a fingerprint sensor. The display  516  may be substantially any size and may be positioned substantially anywhere on the electronic device. 
     The processing unit  500  can control some or all of the operations of the electronic device. The processing unit  500  can communicate, either directly or indirectly, with substantially all of the components of the electronic device. For example, a system bus or signal line  512  or other communication mechanisms (e.g., electronic connectors) can provide communication between the processing unit(s)  500 , the memory  502 , the I/O device(s)  504 , the button assemblies  506 , the power source  508 , and/or the network communications interface  510 . The one or more processing units  500  can be implemented as any electronic device capable of processing, receiving, or transmitting data or instructions. For example, the processing unit(s)  500  can each be a microprocessor, a central processing unit, an application-specific integrated circuit, a field-programmable gate array, a digital signal processor, an analog circuit, a digital circuit, or a combination of such devices. The processor may be a single-thread or multi-thread processor. The processor may be a single-core or multi-core processor. 
     Accordingly, as described herein, the phrase “processing unit” or, more generally, “processor” refers to a hardware-implemented data processing unit or circuit physically structured to execute specific transformations of data, including data operations represented as code and/or instructions included in a program that can be stored within and accessed from a memory. The term is meant to encompass a single processor or processing unit, multiple processors, multiple processing units, analog or digital circuits, or other suitably configured computing element or combination of elements. 
     The memory  502  can store electronic data that can be used by the electronic device. For example, a memory can store electrical data or content such as, for example, audio and video files, documents and applications, device settings and user preferences, timing signals, signals received from the one or more sensors, one or more pattern recognition algorithms, data structures or databases, and so on. The memory  502  can be configured as any type of memory. By way of example only, the memory can be implemented as random access memory, read-only memory, flash memory, removable memory, or other types of storage elements, or combinations of such devices. 
     The one or more I/O devices  504  can transmit and/or receive data to and from a user or another electronic device. The I/O device(s)  504  can include a display, a touch or force sensing input surface such as a trackpad, one or more buttons, one or more microphones or speakers, one or more ports such as a microphone port, one or more accelerometers for tap sensing, one or more optical sensors for proximity sensing, and/or a keyboard. 
     The electronic device may also include one or more button assemblies  506  positioned substantially anywhere on the electronic device and configured to receive inputs and transmit input signals to the electronic device, as described above with respect to  FIGS.  1 - 4   . In various embodiments, the button assembly may be used to control various functions and components of the electronic device, such as a graphical output of a display  516 , an audio output of the audio I/O device  514 , powering the electronic device on and off, and the like. A button assembly  506  may be configured, for example, as a power button, a key of a keyboard, a control button (e.g., volume control), a home button, a watch crown, or the like. In one embodiment, a graphical output of the display  516  is responsive to the input provided to the button assembly. 
     The power source  508  can be implemented with any device capable of providing energy to the electronic device. For example, the power source  508  can be one or more batteries or rechargeable batteries, or a connection cable that connects the remote control device to another power source such as a wall outlet. 
     The network communication interface  510  can facilitate transmission of data to or from other electronic devices. For example, a network communication interface can transmit electronic signals via a wireless and/or wired network connection. Examples of wireless and wired network connections include, but are not limited to, cellular, Wi-Fi, Bluetooth, IR, and Ethernet. 
     It should be noted that  FIG.  5    is for illustrative purposes only. In other examples, an electronic device may include fewer or more components than those shown in  FIG.  5   . Additionally or alternatively, the electronic device can be included in a system and one or more components shown in  FIG.  5    are separate from the electronic device but included in the system. For example, an electronic device may be operatively connected to, or in communication with a separate display. As another example, one or more applications can be stored in a memory separate from the wearable electronic device. The processing unit in the electronic device can be operatively connected to and in communication with the separate display and/or memory. 
     One may appreciate that although many embodiments are disclosed above, that the operations and steps presented with respect to methods and techniques described herein are meant as exemplary and accordingly are not exhaustive. One may further appreciate that alternate step order or fewer or additional operations may be required or desired for particular embodiments. 
     The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings. 
     The present disclosure recognizes that personal information data, including biometric data, in the present technology, can be used to the benefit of users. For example, the use of biometric authentication data can be used for convenient access to device features without the use of passwords. In other examples, user biometric data is collected for providing users with feedback about their health or fitness levels. Further, other uses for personal information data, including biometric data, that benefit the user are also contemplated by the present disclosure. 
     The present disclosure further contemplates that the entities responsible for the collection, analysis, disclosure, transfer, storage, or other use of such personal information data will comply with well-established privacy policies and/or privacy practices. In particular, such entities should implement and consistently use privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining personal information data private and secure, including the use of data encryption and security methods that meets or exceeds industry or government standards. For example, personal information from users should be collected for legitimate and reasonable uses of the entity and not shared or sold outside of those legitimate uses. Further, such collection should occur only after receiving the informed consent of the users. Additionally, such entities would take any needed steps for safeguarding and securing access to such personal information data and ensuring that others with access to the personal information data adhere to their privacy policies and procedures. Further, such entities can subject themselves to evaluation by third parties to certify their adherence to widely accepted privacy policies and practices. 
     Despite the foregoing, the present disclosure also contemplates embodiments in which users selectively block the use of, or access to, personal information data, including biometric data. That is, the present disclosure contemplates that hardware and/or software elements can be provided to prevent or block access to such personal information data. For example, in the case of biometric authentication methods, the present technology can be configured to allow users to optionally bypass biometric authentication steps by providing secure information such as passwords, personal identification numbers (PINs), touch gestures, or other authentication methods, alone or in combination, known to those of skill in the art. In another example, users can select to remove, disable, or restrict access to certain health-related applications collecting users&#39; personal health or fitness data.

Metadata:
Filing Date: 20220607
Publication Date: 20231024
Grant Date: 20231024
Priority Date: 20170619
Inventors: BUSHNELL, TYLER S.
HORIUCHI, JAMES G.
MCCORD, MICHAEL K.
NESS, TREVOR J.
Assignee: APPLE INC
CPC Classifications: [{"code": "G06F1/1656", "inventive": true, "first": true, "tree": "[]"}, {"code": "G04B3/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "G04G21/08", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/169", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/03547", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/044", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1306", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1359", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F1/1656", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F1/169", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1656", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0362", "inventive": true, "first": false, "tree": "[]"}, {"code": "G04G21/08", "inventive": true, "first": false, "tree": "[]"}, {"code": "G04G21/025", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0338", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F2203/011", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/011", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1306", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/169", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/03547", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F3/044", "inventive": true, "first": false, "tree": "[]"}, {"code": "G04G21/08", "inventive": true, "first": false, "tree": "[]"}, {"code": "G04B3/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1306", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06V40/1359", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 73746886