Electronic device having sealed button biometric sensing system

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.

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'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.

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.

FIG. 1illustrates an example electronic device100that may incorporate a biometric sensing system101, as described herein. The electronic device100includes an enclosure120and a biometric button assembly110disposed in an opening of the enclosure120. The biometric button assembly110may displace into the enclosure120and may include an input member112and 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 system101may be configured as a button, as depicted inFIG. 1. Other configurations are possible, such as a key of a keyboard or a joystick of a gaming device. The input member112of the biometric sensing system101may be touched, pressed, or otherwise interacted with by a user. The input member112may 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 enclosure120of the electronic device100. 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 enclosure120.

It is desirable to seal the enclosure120from 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 system101may 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 system101and the opening of the enclosure120to restrict the ingress of contaminants into the enclosure120. 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 enclosure120.

In the illustrated embodiment, the electronic device100is implemented as a wearable computing device (e.g., an electronic watch). The electronic device100is depicted as a watch with watchband104, display103, and crown102. The display103is positioned at least partially within the enclosure120and may be covered with a cover sheet or other transparent protective cover. The watch crown102and the biometric button assembly are at least partially positioned within respective openings in the enclosure120.

The enclosure120provides a device structure, defines an internal volume of the electronic device100, and houses device components. In various embodiments, the enclosure120may 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 enclosure120is constructed from multiple materials. The enclosure120can form an outer surface or partial outer surface and protective case for the internal components of the electronic device100, and may at least partially surround the display103. The enclosure120can be formed of one or more components operably connected together, such as a front piece and a back piece. Alternatively, the enclosure120can be formed of a single piece operably connected to the display103.

In one embodiment, the enclosure120defines an enclosed volume, and may include a passage between the enclosed volume and the opening such that the biometric button assembly110and additional components of the electronic device100may be physically coupled, for example, by an electrical connector. In contrast to conventional buttons, the biometric button assembly110includes a biometric sensor and a flexible conduit to transmit biometric sensor data to a processor of the electronic device100. 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 assembly110is positioned or set in an opening of the electronic device100. The button assembly110may be disposed on any of several locations of the electronic device100. For example, the button assembly110may be positioned along a sidewall of an enclosure120of an electronic device100, as depicted inFIG. 1, in which the button assembly110is positioned on a sidewall of a watch.

Elements of the button assembly110may be integrated with other components of an electronic device. For example, a biometric sensor may be integrated with the rotatable watch crown102of 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 crown102maintains an ability to rotate. In some embodiments, the button assembly110may be positioned on a different portion of an electronic device100, such as on an upper face of an electronic device100. For example, the button assembly110may be disposed adjacent the keyboard of a laptop computer.

The button assembly110includes an input member112that may be touched, pressed, or otherwise interacted with by a user. The input member112may translate, deflect, bend, or otherwise move a relatively small distance in response to user input. The input member112may 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 assembly110is a sealed button assembly with a biometric sensing capability. Such embodiments are discussed in greater detail below with respect toFIGS. 2-5.

The button assembly110may be positioned to extend from the electronic device100, as depicted inFIG. 1. Other configurations of the mounting of the button assembly110are possible. For example, the exterior of the button assembly110may be conformal with an adjacent input surface of an electronic device100, or may be depressed or recessed with respect to an adjacent exterior of an electronic device100. Furthermore, an exterior upper surface of the button assembly110may 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 assembly110extends from the electronic device100, the button assembly110may present a first geometry for a portion extending from the electronic device, and a second geometry for another portion contained within the enclosure120of the electronic device100.

In embodiments in which the button assembly extends from the electronic device100, such as shown inFIG. 1, the button assembly110may present a first geometry for a portion extending from the electronic device, and a second geometry for another portion contained within the electronic device100. For example, the button assembly110depicted inFIG. 1presents 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 assembly110may be shaped in any of several geometries. For example, the button assembly may be circular, oblong, or rectangular.

As shown inFIG. 1, the electronic device100also includes a crown102that receives inputs from a user. In one embodiment, the watch crown102is configured to rotate about an axis and translate along the axis in response to manipulation. The watch crown102may 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 crown102such 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 inFIG. 1, the electronic device100also includes a display103that 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 display103provides a graphical output, for example associated with an operating system, user interface, and/or applications of the electronic device100. In one embodiment, the display103includes 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 display103is operably coupled to a processor of the electronic device100and in various embodiments, a graphical output of the display103is responsive to inputs provided to the biometric button assembly.

The wearable electronic device100can be permanently or removably attached to the watchband104. The watchband104is 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'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 device100can 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 toFIG. 5. Although a watch is shown inFIG. 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. 2A-Bare cross-sections of a biometric button assembly disposed in an opening of an electronic device taken along section A-A ofFIG. 1. The biometric button assembly210is disposed in an opening of an enclosure120of an electronic device100. InFIG. 2A, the biometric button assembly210is depicted in a first, undepressed state. InFIG. 2B, the biometric button assembly210is depicted in a second, depressed state. Alternate embodiments of the biometric sensing system201ofFIGS. 2A-Bare provided inFIGS. 3A-D, discussed below.

The biometric button assembly210is configured to move or displace in response to an input to the input surface212, e.g. a user touch to the input surface. A button housing203of the biometric button assembly210displaces into the opening222of the enclosure120to activate tactile switch250. The tactile switch250provides the user with tactile feedback as to switch operation; for example, whether the switch has been activated. The tactile switch250collapses when activated (as depicted inFIG. 2B), 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 plunger202is used to actuate the tactile switch250. As shown inFIGS. 2A and 2B, the plunger202is positioned below the input surface212and translates or displaces with displacement of the input surface212. The plunger202is positioned above the tactile switch250. The tactile switch250receives a force with movement of the plunger202. Once the plunger202displaces to a threshold distance, the tactile switch250collapses (compareFIGS. 2A and 2B, where the tactile switch250has collapsed inFIG. 2Bfrom un-collapsed configuration inFIG. 2A.)

The tactile switch250may 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 switch250may 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 switch250. For example, the switch250may 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 switch250may 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 device100.

As shown inFIGS. 2A-2B, a biometric sensor230is positioned below the input surface212. Stated another way, the biometric sensor230is located inwards from the input surface212, such that the sensor230is positioned within the button assembly and offset inward with respect to the input surface212. The biometric sensor230senses a biometric characteristic of a user, based on user interaction with the input surface212. For example, the biometric sensor230may be a fingerprint sensor of an array of capacitive sensing elements. Upon a user touch to the input surface212, the biometric sensor230senses a change in capacitance or a value of capacitance of the array of capacitive sensing elements. The biometric sensor230produces 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 volume221of the electronic device.

A flexible conduit240receives the output signal of the biometric sensor230and provides the output signal to the processor of the electronic device100. The flexible conduit240may pass through passage227between the enclosed volume221of the electronic device100and interior volume216within the button housing203.

A seal262is positioned between a sealing surface225of the button assembly210and an enclosure shelf223of the enclosure120of the electronic device100. The seal262restricts ingress of contaminants from entering the enclosed volume221by way of the passage227. The flexible conduit240cooperates with the seal262to restrict ingress of contaminants from entering the enclosed volume221by way of the passage227. The seal262may encircle the passage227.

In the embodiment ofFIGS. 2A-B, the flexible conduit240and the seal262form a stack that may be referred to as a seal region209. The flexible conduit240includes a portion that is disposed above or on top of the seal262, the seal262disposed or on top of the enclosure shelf223. The flexible conduit240portion stacked on top of the seal262is disposed below a sealing surface225of the button assembly210. In the embodiment ofFIGS. 2A-B, a lower surface of the retainer224is the sealing surface225of the button assembly210. In the present example, both the seal262and a portion of the flexible conduit240encircle or surround the passage227. Also, in the present example, the flexible conduit240is stacked over the entire seal262and the relevant portion of the flexible conduit240covers or overlaps substantially all of a sealing surface of the seal262. This is evident fromFIGS. 2A-B, depicting the flexible conduit240disposed above the seal262on both the left side of the plunger202and the right side of the plunger202. (Also, seeFIGS. 3B-Cand associated discussion.)

Other configurations of the seal region209are possible. For example, a portion of the flexible conduit240may be positioned below the seal262, such that a stack is formed of seal262then flexible conduit240. In such a configuration, the seal262would be disposed below the lower surface of the retainer224. In one embodiment, the seal region209is a stack of a first seal, a portion of flexible conduit240, and then a second seal. In another embodiment, the seal262is overmolded about all or a portion of the portion of the flexible conduit240in contact with the seal262. In one embodiment, one or more components of the seal region209may be under compression when fitted below the sealing surface225of the button assembly210.

The biometric sensor230detects inputs received at the input surface212and provides an output signal associated with the detected input, for example, to a processor of the electronic device100. The biometric sensor230may include a set of sensing elements. The biometric sensor230may be partially or entirely disposed in the interior volume216and/or disposed on or near a surface of the button housing203, such as the input surface212. In the embodiment depicted inFIGS. 2A-B, the biometric sensor230is positioned below the input surface212.

The biometric sensor230may 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 surface212. For example, the sensor230may 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 sensor230is a capacitive system which detects differences in capacitance between portions of a user'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 sensor230provides or outputs an output signal or a sensor measurement associated with user interaction with the button assembly210. The output signal may be an electrical output signal. More specifically, the sensor230provides or outputs a signal that is triggered or prompted by user interaction with the input surface212. The input surface212may be an input surface configured to receive a user input which may be sensed by the sensor230, which outputs a signal associated with a biometric of a user. For example, if the force sensor230is a capacitive-based sensor, measurements of voltage, capacitance and the like may be sensed by the sensor230and 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 sensor230and at least a portion of the flexible conduit240are disposed within the interior volume216. The flexible conduit240is engaged with the sensor230such that the flexible conduit240receives an electrical output signal provided or output by the sensor230. Stated another way, the flexible conduit240is configured to receive the electrical output signal output or transmitted by the sensor230. The flexible conduit240transmits the electrical output signal to a processor of the electronic device100, the processor of the electronic device100disposed within the enclosed volume221.

The flexible conduit240receives the output signal of the biometric sensor230and provides the output signal to the processor of the electronic device100. The flexible conduit240may pass through passage227between the enclosed volume221of the electronic device100an interior volume216within the button housing203.

The flexible conduit240is configured to receive the electrical output signal output or transmitted by the sensor230. The flexible conduit240transmits the electrical output signal to a processor of the electronic device100. The processor of the electronic device100is disposed within the enclosed volume221. A proximal or first end of the flexible conduit240is disposed below the sensor230and within the interior volume216. A second or distal end of the flexible conduit240is disposed below the button assembly210and within the enclosed volume221. A portion of the flexible conduit240may pass through a seal region209while not compromising the integrity of the seal region209. Stated another way, the ability of the seal region209to prevent or restrict the entry of contaminants into the enclosed volume221and/or the interior volume216is not degraded or reduced because the flexible conduit240passes through, or forms part of, the seal region219by way of the passage227.

A seal262is positioned between a sealing surface225of the button assembly210and an enclosure shelf223of the opening222of the electronic device100. The seal restricts ingress of contaminants from entering the enclosed volume221by way of the passage227. The flexible conduit240may cooperate with the seal262to restrict ingress of contaminants from entering the enclosed volume221by way of the passage227. A portion of the flexible conduit240may form a stack with the seal262. In one embodiment, the seal262is disposed on the enclosure shelf223. In one embodiment, the seal262is disposed below the sealing surface225of the button assembly210. In one embodiment, a portion of the flexible conduit240is disposed between the seal262and the sealing surface225. In one embodiment, a portion of the flexible conduit240is disposed between the seal262and the enclosure shelf223.

The seal262may 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 seal262may 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 seal262may form, in part or in entirety, a gasket seal, such as a compressible gasket seal.

The flexible conduit240extends from the biometric sensor230through the seal region209and to the processor disposed in the opening222by way of the passage227. The flexible conduit240may pass through the seal region209in 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 inFIGS. 2A-B. In another embodiment, the portion of the flexible conduit that passes through the seal region209substantially forms a plane within the seal262, the plane substantially parallel with the enclosure shelf223and/or the input surface212. Stated another way, a portion of the flexible conduit240may form a stacked configuration with the seal262to form a seal region209. In another embodiment, a first flexible conduit240terminates within the seal, and a second flexible conduit240extends from the seal to the processor, the two flexible connectors240in electrical communication.

The flexible conduit240may 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 conduit240may include a portion that conforms to a geometry of one or more components of the button assembly210. For example, a portion of the flexible conduit240may conform to the interior geometry of the button housing (e.g., seeFIG. 3Cand associated discussion). The flexible conduit240may present a flat although flexible geometry that includes a conductive portion or element that is configured to transfer or communicate electrical signals.

The flexible conduit240may be formed from a flexible circuit, flexible flat cable (FFC), or other similar component or assembly. For example, the flexible conduit240may 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 conduit240typically includes multiple conductive paths or lines, each configured to conduct or communicate a separate electrical signal. The flexible conduit240may 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 sensor230prior to outputting or transmitting the data to the processor of the electronic device100. For example, the flexible conduit may filter the received data from the biometric sensor230such that only activated sensor elements of a multi-sensor biometric sensor230are transferred. Such a scenario occurs when the biometric sensor230is 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 sensor230to capture a biometric datum from the user.

The button housing203of the biometric button assembly210displaces into the opening222of the enclosure120to activate the tactile switch250. The enclosure120has a sidewall partially defining an enclosed volume221, an opening222formed in the sidewall of the enclosure120, an enclosure shelf223formed at a lower or distal portion of the opening222, and a passage227extending from the opening to the enclosed volume221.

The passage227may be configured to receive or pass a portion of the flexible conduit240from the opening222to the enclosed volume221. Any of several components may be positioned in the enclosed volume221to include a processor. The passage227between the enclosed volume221and the opening of the enclosure120is configured so that the sensor230and components of the electronic device100(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 ofFIGS. 2A-B, the flexible conduit240is coupled to the biometric sensor230and extends through the passage227and into the enclosed volume221. The flexible conduit240is illustrated as a flex cable.

The biometric button assembly210includes a button housing203that forms an exterior structure of the biometric button assembly210. The button housing203defines an interior volume216. The exterior structure of the biometric button assembly210includes input surface212and housing wall234. The input surface212extends to a perimeter edge of the biometric button assembly210. The housing wall234extends from the perimeter edge of the biometric button assembly210into the opening222of the electronic device100. The input surface212and the housing wall234define an interior volume216of the button assembly210. The interior volume216is adapted to receive any of several other components, to include a sensor230and a flexible conduit240.

As described above, the plunger202, positioned below the input surface212, displaces with displacement of the input surface212. The plunger202is positioned above the tactile switch250and may actuate the tactile switch250when the input surface212is displaced. As shown inFIGS. 2A-2B.

The plunger202is configured to engage a retainer224within an axial aperture of a central portion of retainer224. The retainer224is axially aligned with the plunger202. The retainer224is at least partially disposed in the interior volume216of the button housing203. The retainer224holds the plunger202in a stable vertical position and allows an axial displacement of the plunger202such that a tactile dome switch250may be activated. The retainer224may be manufactured of any rigid or semi-rigid material, to include metals and hardened plastics. A plunger O-ring204is fitted around a central portion of the plunger202. The plunger202displaces upon a user input to the input surface212, as shown by comparingFIG. 2A, in which the plunger is not displaced, andFIG. 2B, in which the plunger is displaced.

In the embodiment ofFIGS. 2A-B, the retainer224includes a lower surface that forms a sealing surface225of the button assembly210. Specifically, a lower surface of the retainer224may form a sealing surface225of the button assembly210, the sealing surface225engaged with or contacting either the seal262or a portion of the flexible conduit240.

The button housing203may translate or displace within the opening222by slightly displacing the plunger202against the tactile switch250. For example, with respect toFIGS. 2A-B, the button housing203translates or displaces to the left-right against the plunger202in response to a user input. Tactile dome switch250activates upon movement or displacement of the plunger202. Once the plunger202displaces to a threshold distance, the tactile switch250collapses.FIG. 2Adepicts the tactile switch250in an unactivated or uncollapsed state.FIG. 2Bdepicts the tactile switch250in an activated or collapsed state.

The opening222extends to an enclosure shelf223adapted to receive the button housing203and the switch250. The switch250may be incorporated or assembled to a printed circuit board (PCB) that is affixed to the enclosure shelf223by an adhesive or fastener. The PCB may include electrical terminals and electrical routing elements for electrically coupling the switch250with other elements or components of the device.

The tactile dome switch250may 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 switch250buckles 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 switch250to receive and transfer the output from the tactile dome switch250. As previously discussed, components of the electronic device100, such as the display, may respond to an activation of the tactile dome switch250.

In one embodiment, the biometric sensing system201may be configured to activate in response to an input force to an input member of the biometric button assembly210which 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 assembly210. For example, when an object, e.g., a user finger, approaches the input surface212of the button assembly210, the object may be detected by a proximity sensor, resulting in a signal used to activate the biometric sensing system201. In one embodiment, the sensor230may nominally remain off until the proximity sensor is activated. Such a configuration allows power to be conserved, for example, in that the sensor230is only activated when a user is adjacent the proximity sensor and/or adjacent the button assembly210. 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 wall234, to include a housing wall234configured as a trim surface. In one embodiment, the housing wall234is a conductive material. In one embodiment, the proximity sensor is disposed within the interior volume216and/or is embedded in the input surface212. The button assembly210is at least partially disposed in an opening222of an electronic device100. As shown inFIGS. 2A-B, the button assembly210may be positioned to protrude from a surface of the enclosure220.

The physical profile of the button assembly210may 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 surface212extends to a perimeter edge of the button assembly210. A housing wall234extends from the perimeter edge of the button assembly210into the opening222. Although the housing wall234is shown inFIGS. 2A-Bas a straight cross-section, other geometries are possible. For example, the housing wall234may form a straight cross-section with a cut-out to retain an O-ring seal. In one embodiment, the housing wall234is a trim surface that is matched to the look and/or feel of the enclosure220. For example, the housing wall234may be manufactured of the same material (e.g., a metal alloy) as the enclosure220, present the same color as the enclosure220, and/or present the same texture (e.g. roughness) as the enclosure220. In some embodiments, the housing wall234may be manufactured of a complementary material to the enclosure220, or manufactured of a material not the same as the enclosure220.

FIG. 3Ais a cross-section of a biometric button assembly disposed in an opening of an electronic device taken along section A-A ofFIG. 1. The biometric button assembly310is disposed in an opening of an enclosure120of an electronic device100. The biometric button assembly310is depicted in a first, undepressed state. The biometric button assembly310may operate in a second, depressed state (not shown). The embodiment of the biometric button assembly310ofFIG. 3Ais an alternative design of the embodiment of the biometric button assembly210ofFIGS. 2A-B.

Generally, the biometric button assembly310is configured to move or displace in response to an input to the input surface212, e.g. a user touch to the input surface. A button housing303of the biometric button assembly310displaces into the opening222of the enclosure120to activate tactile switch350. The tactile switch350provides the user with tactile feedback as to switch operation; for example, whether the switch has activated. The tactile switch350collapses 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 assembly310defines an input surface212on the exterior of the biometric button assembly310for 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 surface212. The button assembly310includes a cover glass316, such as sapphire. The cover glass316may be an input member with input surface212, as discussed previously with respect to the embodiment ofFIGS. 2A-B. A biometric sensor330is positioned below the input surface212. Stated another way, the biometric sensor330is located inwards from the input surface212, such that the sensor330is positioned within the button assembly and offset inward with respect to the input surface212. The biometric sensor330detects inputs received on the input surface212. A flexible conduit340receives an output signal from the sensor330and transmits the output signal to a processor of the electronic device100.

The upper portion of the button assembly310includes a stack of several components. The stack of components will be described from the exterior of the button assembly310inward. An input surface212defines an upper input surface of the button assembly310. The input surface212is formed on the upper surface of the cover glass316. Biometric sensor330is disposed below cover glass316. Biometric sensor330is disposed within an upper portion of encapsulant333. The encapsulant333is disposed above an upper stiffener314. Lastly, the upper stiffener314is disposed above and is connected to the plunger202. In one embodiment, the encapsulant is overmolded around the sensor die311.

Biometric sensor330is depicted inFIG. 3Ato highlight the sensor330component elements of sensing elements308and sensor die311. The sensor330may include one or more of the biometric sensor types discussed above, to include capacitive, optical, and ultrasonic. The sensing elements308are the active sensing components of a particular biometric sensor330. For example, if the biometric sensor330is a multi-capacitor sensor, the sensing elements308are the capacitive plate elements that, together, form a matrix of capacitive sensing elements. The sensor die311is shaped or configured to snuggly fit or securely retain the sensing elements308. In one embodiment, the sensor die311forms an interference fit with the sensing elements308.

The sensor die311retains the sensing elements308in a substantially planar configuration such that sensing of a user input may be performed. For example, if the sensor330was a self-capacitive system, upon a user touch to the input surface212, a change in capacitance between one or more of the sensing elements308and the user finger would occur. One or more of the sensing elements308would 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 elements308, 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 die311is disposed within encapsulant333. The encapsulant333encloses and protects the sensor die311and the sensing elements308. A perimeter of the encapsulant333may engage a lower surface of the cover glass316, thereby enclosing or sealing the sensor330. The encapsulant333may protect the sensor330from, among other things, humidity, temperature changes, vibration, and mechanical shock such as caused by dropping of the electronic device100. The encapsulant333may be any encapsulant or electrical potting compound known to those skilled in the art, to include polyurethanes, epoxies, silicones, and other polymers.

Upper stiffener314is disposed between the encapsulant312and the plunger202. Stated another way, the upper stiffener is disposed below a lower surface of the encapsulant333and disposed above an upper surface of the plunger202. The upper stiffener314is formed of a rigid material, such as metal or hardened plastic. The upper stiffener314helps to distribute the contact force and/or contact load applied to the sensor330during operation of the plunger202.

The flexible conduit340receives the output signal from the biometric sensor330and transmits the output signal to a processor within the electronic device. A first or proximal end of the flexible conduit340is engaged with at least a portion of the encapsulant333. In the embodiment ofFIG. 3A, the proximal end of the flexible conduit340is disposed within a lower portion of the encapsulant333. In such a configuration, the proximal end of the flexible conduit340remains fixed and in a predictable distance and orientation with respect to the sensor330.

The flexible conduit340receives an electrical output signal generated and output by the sensor330and transmits the electrical output signal to a processor of the electronic device100. The flexible conduit340runs from below the sensor330, along an edge of the button assembly310, to below the button housing303. At the distal end of the flexible conduit340, an electrical connection connects the flexible conduit340with a system connector306. The system connector306receives data or electrical output signals from the system connector306and outputs the electrical output signals to a processor of the electronic device100.

The second or distal end of the flexible conduit340connects with the system connector306through a hot bar connector322. The hot bar connector322provides an electrical connection between the flexible conduit340and the system connector306. 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 connector322may 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 ofFIG. 3A, the retainer224is of stepped design, with a lowest step providing a stop to displacement of the button housing303. Other configurations of the retainer224are possible, to include a sloped design (such as that ofFIGS. 2A-B.) The retainer224lower surface forms a sealing surface225for the button assembly310.

The retainer224is disposed on a portion of the flexible conduit340. Stated another way, the sealing surface225of the retainer224is disposed on a portion of the flexible conduit340. A portion of the flexible conduit340disposed below the sealing surface225of the retainer is disposed on a face seal318. The face seal318is in turn disposed on a static seal320. In some embodiments, only one of face seal318and static seal320are provided. For example, the sealing surface225of the retainer is disposed on a portion of the flexible conduit340, a portion of the flexible conduit340in turn disposed or either the face seal318or the static seal. In another embodiment, the stack of seals and flexible conduit are in a different sequence. For example, from sealing surface225of the retainer224toward the enclosed volume, the stack may be face seal318, flexible conduit340, then static seal320.

Alternatively, the stacked sequence may be face seal318, static seal320, then flexible conduit340, or any sequence combination of face seal318, static seal320, and flexible conduit340. Additionally, one or more adhesives may be used to bond the above layers together. For example, an adhesive may be fitted between face seal318and static seal320or between other combinations of layers. In one embodiment, the face seal318is a gasket seal. The face seal318may be a pressure-sensitive adhesive (PSA). In one embodiment, the static seal320is a gasket seal. The static seal320may be a pressure-sensitive adhesive (PSA).

In the present example, the face seal318, static seal320, and a portion of the flexible conduit340encircle or surround the passage327. Also, in the present example, the flexible conduit340is stacked over the face seal318and the static seal320, and the relevant portion of the flexible conduit340covers or overlaps substantially all of a sealing surface of the face seal318and the static seal320.

In one embodiment, a portion of the flexible conduit340is fitted within a layer of seals and/or PSA to form a seal region309. For example, PSA may be applied to both an upper and a lower surface of the distal end of the flexible conduit340, such that the upper PSA portion connects with the sealing surface225of the retainer224and the lower PSA portion connects with the enclosure shelf of the opening222. In another example, a gasket seal (such as face seal318) may further be applied below the lower PSA portion, such that a sandwich, from outside the button assembly inwards, is formed of PSA, flexible conduit340, PSA, and then the gasket seal. In one embodiment, one or more seals are insert molded around the flexible conduit340. In one embodiment, one or more seals are face sealed against the flexible conduit340. In one embodiment, one or more seals are adhered to the flexible conduit340using pressure-sensitive adhesives. In one embodiment, all or part of the seal region is overmolded around all or part of the flexible conduit340that passes into or through the seal region.

In one embodiment, the one or more parts fitted between the sealing surface225of the button assembly310, such as the lower surface of the retainer224, and the enclosure shelf may be termed a seal region309. The seal region restricts entry or ingress of contaminants into the enclosed volume221by way of passage327. The components which form the seal region309may 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 volume221. As shown inFIGS. 3A and 3D, the seal region309, including the face seal318, static seal320, and relevant portion of the flexible conduit340, encircles or surrounds the passage327to prevent or reduce the ingress of contaminants into the enclosed volume221of the enclosure120. The seal region309including the various components also surrounds the tactile dome350and other electronic or electrical components of the switch, which may protect those components from contaminants, as well.

The button assembly310includes a plunger202, the plunger202in turn connected to a switch350. The plunger202is axially aligned within the button assembly310. With movement of the button assembly310, the plunger202translates or displaces, resulting in activation of the switch350. The plunger is fitted in a central groove to receive a plunger O-ring204. The plunger O-ring204is configured to engage with a retainer224, discussed with regard toFIGS. 2A-B. An upper portion of the plunger202may be attached to a lower portion of the upper stiffener314. In one embodiment, the upper portion of the plunger202is attached to the lower portion of the upper stiffener314with an adhesive or other attachment device or mechanism.

The switch350is disposed on a printed circuit board (PCB)325, which is in turn disposed on a bracket324. The bracket324is a rigid component that provides structural support to the PCB325and to the switch350. The PCB325includes electrical connections to receive electrical activation signals from the switch350, and may hold other electrical components. The bracket324may be disposed on a shelf within the opening222of the electronic device100.

FIG. 3Bis an exploded view of portions of the embodiment of a biometric sensing system301ofFIG. 3A.FIG. 3Cis a close-up of two components ofFIG. 3Bfitted together. InFIG. 3B, nine portions of the biometric sensing system301are shown. Generally, the components of the biometric sensing system301interlock. The stack of components will be described in a descending direction from the exterior of the button assembly downward, and from left to right inFIG. 3B.

The cover glass316fits with or is conformal with an assembly of the encapsulated sensor die, sensor elements, and the flexible conduit340. The encapsulated sensor die and the sensing elements are depicted as assembled to the partially encapsulated flexible conduit340, and not depicted separately. Note that the portion of the flexible conduit340that is not encapsulated is the portion that runs along an outer portion of the button housing303and connects with the system connector306. A system connector306may include another separate flexible circuit or conduit that is electrically coupled to the flexible conduit. The system interconnect306may include a set of interconnects, such as circular interconnects or linear interconnects and may provide an electrical connection between the flexible conduit340and the system connector306. For example, the system interconnect may be an electrical connector, such as an encased wire. The system interconnect306may replace or supplement the hot bar connector322. The assembly of encapsulated sensor die, sensing elements, and flexible conduit340fit within button housing303and rest on a shelf of the button housing303, as shown inFIGS. 3A-B.

FIG. 3Cdepicts an assembly of the flexible conduit340fitted to the button housing303. The flexible conduit340may include an upper portion339that is connected to the sensor330. (SeeFIG. 3A.) A second or sealing portion341of the flexible conduit340is coupled to the first portion339by a folded portion343. The sealing portion341may be generally flat and may interface with the seal to form a seal region, as described above with respect toFIG. 3A. One or more openings or apertures formed in the sealing portion341may 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 conduit340, specifically the sealing portion341, may prevent or reduce ingress of contaminates for those components or regions of the device. A folded conduit portion343connects first conduit end339and second conduit end341and may be configured to bend, flex, or fold in accordance with the operation of the switch. The folded conduit portion343may be of smaller width then the width of one or both of first conduit end339and second conduit end341. The folded conduit portion343may be configured with multiple folds, so as to form an accordion configuration, as depicted inFIG. 3C.

Returning toFIG. 3B, plunger202, with plunger O-ring seal204, fit within a central aperture of retainer224. After folding the flexible conduit340such that second conduit end341is aligned and fitted below lower surface of retainer224, face seal318fits below second conduit end341. Static seal320is depicted already attached to face seal318. Retainer224is depicted with a central hole to allow passage of plunger202and switch350. Lastly, bracket324is shown to form a lower component of the biometric sensing system301. Note further that lower bracket324is depicted with two fasteners that engage with two outer holes in retainer224.

FIG. 3Dis a sample cross-section view of the electronic device100ofFIG. 1, taken along section A-A inFIG. 1and showing another embodiment of a biometric sensing system301. The embodiment ofFIG. 3Dis similar to the embodiment ofFIGS. 3A-Bexcept that the configurations of some components are different. Specifically, the flexible conduit340and associated connections, the configuration of the stiffener314, and the seal region309are different.

Stiffener314is 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 housing310.

The upper positioning of the flexible conduit340is extended in the embodiment ofFIG. 3Drelative to that ofFIGS. 3A-B. The first or proximal end of the flexible conduit340extends across substantially the entire horizontal portion of the encapsulant333. This configuration provides more overlapping between the flexible conduit340and the sensor330. Such increased overlapping area may allow additional electrical output signal processing to occur at the proximal end of the flexible conduit340, and/or allow increased robustness in electrical output signal transfer between the flexible conduit340and the sensor330.

The lower positioning of the flexible conduit340is outside of the opening222of the electronic device100in the embodiment ofFIG. 3D. The flexible conduit340runs from below the sensor330, along an edge of the button assembly310, to below the retainer224.

The second or distal end of the flexible conduit340forms a portion of seal region309. The distal end of the flexible conduit340is disposed below both the static seal320and the face seal318. The distal end of the flexible conduit340connects with the system connector306through the hot bar connector322. A seal region309is formed by a stack of seals and the distal end of the flexible connector340. More specifically, a stack is formed of face seal318, static seal320, and flexible conduit340. The hot bar connector322connects the distal end of the flexible conduit340and the system connector306.

FIGS. 4A-Bare cross-sections of a biometric button assembly disposed in an opening of an electronic device taken along section B-B ofFIG. 1. The biometric button assembly410is disposed in an opening of an enclosure120of an electronic device100. In the embodiment ofFIG. 4A, the button assembly410is stationary and includes a biometric sensor430. The biometric sensor430produces an output signal in response to a user touch to a button input surface212. The output signal corresponds to a biometric characteristic of a user, such as a fingerprint. A flexible conduit440transmits the sensor data to a processor positioned inside the electronic device. The button assembly410also includes a touch sensor configured to detect an input to the button input surface212. The touch sensor includes a lower capacitive plate420which produces a signal indicating a user touch to the input surface212. The button is sealed by an O-ring seal414positioned between the button housing403and an enclosure120of the electronic device.

The button housing403of the biometric button assembly410includes a biometric sensor430configured to detect a biometric characteristic of a user. The biometric sensor430is coupled to an input surface212disposed on a button housing403of the button assembly410. A flexible conduit440is operable to couple the sensor430to a processor of the electronic device by transmitting signals from the sensor to the processor. The processor is positioned in an enclosed volume421of the enclosure120of the electronic device. The flexible conduit440passes from an interior volume424of the button housing403to the enclosed volume421of the enclosure120by way of passage427.

The biometric sensor430is similar to the sensors230and330discussed with respect toFIGS. 2-3. An input surface212is positioned above the biometric sensor430. The biometric sensor430senses a biometric characteristic of a user, based on user interaction with the input surface212. In various embodiments, the biometric button assembly may be used to determine a biometric characteristic.

The biometric sensor430detects inputs received at the input surface212and provides an output signal associated with the detected input, for example, to a processor of the electronic device100. More specifically, the sensor430provides or outputs a signal that is triggered or prompted by user interaction with the input surface212. For example, the input surface212may be an input surface configured to receive a user input which may be sensed by the sensor430, the sensor430sensing or outputting a signal associated with a biometric of a user.

The sensor430may be any type of biometric sensor that provides a signal associated with a biometric of a user. For example, the sensor430may 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 sensor430may 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 surface212. 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 conduit440receives the output signal of the biometric sensor430and provides the output signal to the processor of the electronic device100. The flexible conduit440may pass through passage427between the enclosed volume421of the electronic device100and the interior volume424within the button housing403. A proximal or first end of the flexible conduit440is disposed below the sensor430and within the interior volume424. A second or distal end of the flexible conduit440is disposed below the button assembly410and within the enclosed volume421.

The button assembly410also includes a touch sensor configured to detect an input to the button input surface212. The touch sensor includes a lower capacitive plate420, which produces a signal indicating a user touch to the input surface212. The touch sensor and lower capacitive plate420may be configured in any of several ways to detect a touch. Generally, the touch sensor may operate independently from the biometric sensor430or in cooperation with the biometric sensor430.

The touch sensor may operate independently from the biometric sensor430by using the lower capacitive plate420to detect a change in capacitance with a capacitive element positioned above the lower capacitive plate420. The lower capacitive plate420may detect a capacitive virtual ground effect caused by a user touch (or near touch) to the input surface212. The measured change in capacitance is identified by the lower capacitive plate420, producing an output signal from the lower capacitive plate420. The lower capacitive plate420output signal is transmitted to the processor of the electronic device by flexible conduit440′ as will be described in more detail with respect toFIG. 4B, the input surface212may displace and/or deflect relative to the lower capacitive plate420. Such a change in relative distance causes a change in capacitance between the user finger and the lower capacitive plate420, which may be equated to a touch on the input surface212.

The touch sensor may operate in cooperation with the biometric sensor430. For example, if the biometric sensor430is a capacitive-based sensor, then a capacitor of the biometric sensor430and the lower capacitive plate420may form a two plate capacitive gap sensor. The capacitor of the biometric sensor430and the lower capacitive plate420may also cooperate to form a mutual capacitance system. A change in capacitance will occur when the distance between the biometric sensor430and the lower capacitive plate420changes, either due to movement or deflection of the input surface212.

The output of the lower capacitive plate420of the touch sensor is provided to flexible conduit440′. Flexible conduit440′ receives the output signal of the lower capacitive plate420of the touch sensor and provides the output signal to the processor of the electronic device100. The flexible conduit440′ passes through passage427between the interior volume424of the button housing403and the enclosed volume421of the electronic device100. A proximal or first end of the flexible conduit440′ is disposed below the lower capacitive plate420and within the interior volume424. A second or distal end of the flexible conduit440′ is disposed below the button assembly410and within the enclosed volume421.

Both the lower capacitive plate420and the flexible conduit440′ are mounted to shelf422. The shelf422may be attached to the button housing423by a laser weld or other joining technique. The shelf422may be separated from the enclosure120by a gap and/or may be separated by the isolation sheet415.

An electrical isolation sheet415is positioned against a housing shelf of the button housing403such that when the button assembly410is installed in an electronic device, the button assembly410is electrically isolated from the electronic device. In one embodiment, the electrical isolation sheet415additionally 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 sheet415may be a gasket made of rubber, plastic, or another suitable material.

The button assembly410engages an opening of an electronic device100. The electronic device100includes an enclosure120which defines an enclosed volume421. An opening222may be connected to the enclosed volume421by way of passage427. The enclosed volume421of the electronic device100may include components such as a processor, data storage memory, and the like. An O-ring seal414is fitted between the button assembly410and the opening222in order to prevent or restrict the entry of contaminants into the enclosed volume421and/or the opening222.

The button assembly410further includes a housing wall423extending from a perimeter edge of the input surface212. The input surface212, housing wall423, and housing shelf405define the button housing403. The housing shelf defines a lower end of the button assembly. The housing wall423may comprise a trim portion. The trim portion may be configured with characteristics similar to that of the adjacent portion of the electronic device100. For example, the trim portion may be of the same color, texture, and/or material composition as the adjacent portion of the electronic device100. The housing wall423is configured with a perimeter channel to receive the O-ring seal414.

The O-ring seal414contacts the housing wall423of the biometric button assembly410and the opening222of the enclosure120such that contaminants are inhibited from entering the enclosure120and the interior volume424of the button housing403. The O-ring seal414is disposed between the housing wall423and the opening222. The O-ring seal414restricts and/or prevents contaminants from entering the enclosed volume of the electronic device100by way of passage427. The O-ring seal also restricts and/or prevents contaminants from entering the interior volume of the button assembly410. More specifically, the O-ring seal restricts and/or prevents contaminants that may enter a gap between the housing wall423and opening222and thus enter one or both of the enclosed volume421of the electronic device100and the interior volume424of the button assembly410.

The O-ring seal414may be manufactured of any known sealing material. For example, the O-ring seal414may be formed of materials such as rubber and elastomeric materials. In one embodiment, the O-ring seal414forms 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 housing403is attached to electronic device100by way of fasteners402. In the embodiment depicted, the fasteners402are screws. Other retaining means are possible, to include press fits, clamps, and adhesives. The fasteners402are fixed to the electronic device100such that a portion of each fastener extends into the button housing403. More specifically, the fastener engages the housing shelf405of the button housing403. In one embodiment, fasteners402are made of a non-conductive material, such as a resin or a plastic. In another embodiment, the fasteners402are 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 fasteners402attaching the button housing403to the enclosure place the seal in compression. In one embodiment, the seal is the electrical isolation sheet415.

With attention toFIG. 4B, more detail of the biometric sensing assembly410is provided. The biometric sensor430is depicted with components of sensing elements408and sensor die411. The sensing elements408are the active sensing components of a particular biometric sensor430. For example, as discussed with respect toFIGS. 3A-B, if the biometric sensor430is a multi-capacitor sensor, the sensing elements408are the capacitive plate elements that, together, form a matrix of capacitive sensing elements. The sensor die411is shaped or configured to snuggly fit or securely retain the sensing elements408. In one embodiment, the sensor die411forms an interference fit with the sensing elements408.

The sensor die411retains the sensing elements408in a substantially planar configuration. Sensor overmold433is disposed below sensor die411. In some embodiments, sensor overmold433may at least partially hold or encircle sensor die411.

An input member412may be disposed above biometric sensor430and extend across the top surface of the button housing403. The input member412may be capable of deflecting, or otherwise moving, relative to the lower capacitive plate420. The input member412may move or deflect in response to a user touching or pressing on the input surface212. In one embodiment, the input member412is a cover glass, such as sapphire.

In one embodiment, the input member412includes a first or upper layer that matches the housing wall423. For example, the upper layer of the input member412may be of the same material, or appear to be of the same material, as the housing wall423. In one embodiment, the input member412includes a second layer positioned below the first layer, the first layer being a cover glass, such as a sapphire cover glass.

System interconnects426are disposed below the sensor overmold433. The system interconnects426electrically connect the signals output from the sensing elements408to the flexible conduit440. The flexible conduit440bends downward into the interior volume by way of passage427, ultimately connecting to a processor of the electronic device100.

The system interconnects426and the flexible conduit440are positioned within or in contact with a compressible layer404. The compressible layer404compresses to allow slight deflection and/or displacement of the input member412. Stated another way, the compressible layer404is compressible, thereby enabling the input member412to slightly displace or bend toward the interior volume424.

In one embodiment, the compressible layer404is 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 conduit440. 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 layer404is made of any combination of the above materials. System interconnects426may be positioned within all or a portion of the compressible layer404.

FIG. 4Cis a sample assembly drawing of portions of the embodiment of a biometric sensing system401ofFIG. 4B. The stack of components will be described in a descending direction from the exterior of the button assembly downward, and from right to left inFIG. 4C. Generally, the components of the biometric sensing system401interconnect.

Input member412, which may be a sapphire cover glass, fits over sensing elements408as fitted to sensor die411. The assembly of sensor die411and sensing elements408then fit to sensor overmold433. Sensor overmold433is in turn disposed on compressible layer404, which in turn fits to a housing shelf of button housing403. O-ring seal414fits around a perimeter of button housing403. Lower capacitive plate420, with a portion of flexible conduit440′, fits below the button housing403. Next, electrical isolation sheet415engages a lower portion of the button housing403. Lastly, fasteners402secure the button housing403to the enclosure120of the electronic device100.

FIG. 4Dis another sample assembly drawing of the completed button assembly410fitted to the electronic device100by way of fasteners402. The fasteners402pass through the enclosure120to secure the button assembly410to the enclosure120. Other configurations of securing the button assembly410to the enclosure120are possible, to include use of other attachment devices, such as adhesives. In one embodiment, the button assembly is secured to the enclosure120by an interference fit.

FIG. 4Eis a sample cross-section view of the electronic device100ofFIG. 1, taken along section B-B inFIG. 1and showing another embodiment of a biometric sensing system401. The embodiment ofFIG. 4Eis similar to the embodiment ofFIG. 4B, except that the configuration of the flexible conduit440is altered. Specifically, the flexible conduit440travels in a serpentine manner from below the sensor overmold433(the same starting configuration as the flexible conduit440ofFIG. 4B), to below the lower capacitive plate420(the same location as flexible conduit440′ ofFIG. 4B), then bending downward into the interior volume42, ultimately connecting to a processor of the electronic device100.

FIG. 5is an illustrative block diagram550of an electronic device100as described herein. The electronic device can include a display516, one or more processing units500, memory502, one or more input/output (I/O) devices504, one or more button assemblies506, a power source508, and a network communications interface510.

The display516may 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 display516may be substantially any size and may be positioned substantially anywhere on the electronic device.

The processing unit500can control some or all of the operations of the electronic device. The processing unit500can communicate, either directly or indirectly, with substantially all of the components of the electronic device. For example, a system bus or signal line512or other communication mechanisms (e.g., electronic connectors) can provide communication between the processing unit(s)500, the memory502, the I/O device(s)504, the button assemblies506, the power source508, and/or the network communications interface510. The one or more processing units500can be implemented as any electronic device capable of processing, receiving, or transmitting data or instructions. For example, the processing unit(s)500can 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 memory502can 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 memory502can 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 devices504can transmit and/or receive data to and from a user or another electronic device. The I/O device(s)504can 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 assemblies506positioned substantially anywhere on the electronic device and configured to receive inputs and transmit input signals to the electronic device, as described above with respect toFIGS. 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 display516, an audio output of the audio I/O device514, powering the electronic device on and off, and the like. A button assembly506may 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 display516is responsive to the input provided to the button assembly.

The power source508can be implemented with any device capable of providing energy to the electronic device. For example, the power source508can 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 interface510can 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 thatFIG. 5is for illustrative purposes only. In other examples, an electronic device may include fewer or more components than those shown inFIG. 5. Additionally or alternatively, the electronic device can be included in a system and one or more components shown inFIG. 5are 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 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.

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' personal health or fitness data.