Patent Description:
Conventional mechanical switches are used in numerous applications in electronic products. For example, many button and keyboard designs include mechanically based actuators that rely on relatively large movements to complete electrical circuits. Advantages of mechanical switches include their low cost and ability to provide audible and tactile response to a user. However, mechanical switches are relatively large in size and, therefore, are difficult to integrate into products that have very limited space. This can be a major obstacle for integrating into modern portable electronic products, which include a multitude of electronic components packed within small enclosures. Furthermore, mechanical switches can wear out quickly, and therefore may need frequent replacing. What are needed, therefore, are improved sensor and actuator designs for electronic devices.

<CIT> discloses a piezoelectric sensor that comprises at least one piezoelectric element arranged so that it is bendable to produce an electric signal, at least one drive unit configured to drive the at least one piezoelectric element to make it vibrate by changing a drive voltage over the piezoelectric element, and at least one microcontroller that is configured to read electric signals indicating bending of said at least one piezoelectric element, and also to operate the drive unit on said at least one piezoelectric element.

<CIT> discloses various structures and methods for packaging a biometric sensor, such as a capacitive biometric sensor. Embodiments incorporate various placements of the biometric sensor, structure surrounding a biometric sensor, connection structures (electrical, physical, or both), and techniques for enhanced sensor imaging, sensor retention, and guiding a user's finger to a proper location above a biometric sensor. For example, A biometric sensor assembly can include an aperture formed in a trim with a cap disposed in the aperture. A biometric sensor may be positioned below the cap and a switch positioned below the biometric sensor.

<CIT> discloses a displacement sensor comprising: a reference electrode; and a displacement element movably mounted relative to the reference electrode and comprising a substrate having first and second opposing surfaces with a first electrode arranged around a peripheral part of the first surface and a second electrode arranged around a peripheral part of the second surface, and wherein the reference electrode on the same side of the substrate as the second electrode and offset therefrom; and a controller element configured to measure a capacitance characteristic of the second electrode at different times and to determine whether there has been a displacement of the displacement element relative to the reference electrode based on whether there has been a change in the capacitance characteristic of the second electrode.

<CIT> discloses techniques for quick haptic feedback, without the use of a controller, which is local to individual, non-actuating keys, such as keys of a thin keyboard or keypad. The haptic feedback may be in the form of a simulated "key-click" feedback for an individual key that is pressed by a user such that the finger used to press the key feels the tactile sensation. The haptic feedback mimics the tactile sensation of a mechanical key (e.g., buckling spring, pop-dome key switch) to give a user the perception that they have actuated a mechanically movable key.

This paper describes various embodiments that relate to sensor assemblies for electronic devices. In particular embodiments, the sensor assemblies include solid-state sensors that require small deflections for activation and have small cross-section profiles.

The problem underlying the present invention is solved by independent claim <NUM>.

The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements.

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 embodiment. To the contrary, it is intended to cover alternatives, modifications, and equivalents as can be included within the scope of the described embodiments as defined by the appended claims.

Described herein are features of sensor assemblies that are well suited for consumer products, such as portable electronic devices. According to some embodiments, the sensor assemblies include solid-state sensors. Compared to conventional mechanical switches and buttons that depend on physical contact between contact pads, solid-state sensors utilize voltage or capacitive changes to switch between on and off modes. This aspect makes solid-state sensors less likely to wear out compared to mechanical switches. In addition, solid-state sensors are generally more compact than mechanical switches and buttons, making them well suited for integration within small form factor enclosures, such as those for portable electronic devices.

Furthermore, solid-state pressure sensor designs can require very small movements and forces in order to activate compared to mechanical switches and buttons. Since the sensor assemblies involve minimal or little movement (e.g., <NUM> micrometers or less, sometimes <NUM> micrometers or less), a user may not perceive movement of the sensor assembly (e.g., button) itself when pressed. Thus, the sensor assembly can be configured to provide tactile feedback (output) to the user in response to a user's touch input, which this gives the user the experience that the button has been depressed and activated, even if the sensor assembly barely moves. Examples of tactile feedback can include haptic (e.g., vibratory) feedback. In some instances, a signal to the user is in the form of acoustic or sonic feedback (i.e., makes a sound). In some cases, the sensor assembly is configured to provide a combination of tactile and acoustic feedback. These feedback features can mimic the experience of activating a mechanical switch or button, thereby providing a pleasing experience for a user. Furthermore, the sensor assembly can provide tactile feedback in response to a user's tactile input (e.g., user's touch), giving the user an engaging and satisfying sensation and experience with the electronic device.

The sensor assemblies described herein can include a number of features that enhance performance of the sensor assemblies when integrated within electronic devices. For example, a trim that surround a sensor cover or cap can prevent lateral movement of the sensor assembly and isolate movement of portions of the sensor assembly to a direction toward or away from a touch sensor.

The sensor assemblies described herein are well suited for integration into consumer products such as computers, portable phones, tablet devices, wearable electronic devices, and electronic device accessories, such as those manufactured by Apple Inc. , based in Cupertino, California.

<FIG> show consumer products than can include sensor assemblies such as those described herein. <FIG> shows portable phone <NUM>, and <FIG> shows tablet computer <NUM>, each of which includes sensor assemblies <NUM> configured to sense input from a user. Sensor assemblies <NUM> can be configured to activate one or more electrical circuits within respective devices <NUM> or <NUM>, and therefore may be referred to as button assemblies or switch assemblies. For example, sensor assemblies <NUM> may be configured to activate aspects of displays <NUM> of devices <NUM> and <NUM>, respectively. Sensor assemblies <NUM> can be designed to cosmetically enhance the appearance of enclosures <NUM> of devices <NUM> and <NUM>. In some cases, sensor assemblies <NUM> are integrated with display covers <NUM> of enclosures <NUM>.

Sensor assemblies <NUM> can include one or more sensors for detecting of input (e.g., touch, push, motion, light). In some cases, the sensors includes one or more capacitive, piezoelectric and piezoresistive sensors. In some cases, sensor assemblies <NUM> are configured to provide output to a user, such as haptic or acoustic feedback, to indicate that sensor assemblies <NUM> are activated in response to the input. In some embodiments, sensor assemblies <NUM> include fingerprint sensors that can detect and distinguish between fingerprints of different users. It should be noted that the sensor assemblies described herein can be integrated within any suitable electronic device and are not limited to devices <NUM> and <NUM> shown in <FIG>. For example, the sensor assemblies can be implemented in laptop computers or wearable electronic devices.

<FIG> shows an exploded view of a portion of an electronic device (e.g., portable phone <NUM>), showing how sensor assembly <NUM> is configured to fit within opening <NUM> of display cover <NUM>. Display cover <NUM> can correspond to a transparent or partially transparent material that covers and protects an underlying display assembly. Display cover <NUM> can be composed of glass (e.g., sapphire), plastic, ceramic, and/or other suitable material. In some cases, display cover <NUM> is coupled with another portion of an enclosure for the portable phone (e.g., a metal portion of the enclosure) using fastening features <NUM>. Bracket <NUM> can be used to secure sensor assembly <NUM> to display cover <NUM> via fasteners <NUM>. It should be noted that the sensor assembly <NUM> can be inserted within an opening of any suitable portion of an electronic device and is not limited to integration with a display cover. For example, sensor assembly <NUM> can be inserted within an opening of a non-transparent enclosure wall of an electronic device.

As shown, sensor assembly <NUM> can in a pre-assembled in modular form for ease of assembly into an electronic device. Sensor assembly <NUM> includes sensor portion <NUM> and cable portion <NUM>. Sensor portion <NUM> can include a sensor that is configured to detect input (e.g., touch, push, motion, light). In some cases the sensor is configured to detect touch or push input from a user's finger. In some instances the sensor includes one or more capacitive, piezoelectric and piezoresistive sensors. In some cases, sensor assembly <NUM> includes a fingerprint sensor configured to detect a users fingerprint. Cable portion <NUM> can include wiring that electrically connects sensor portion <NUM> to other electrical components within the electronic device. In some embodiments, cable portion <NUM> includes one or more flexible (flex) cables. Sensor cover <NUM> corresponds to a cosmetic cover having an exterior or outer surface configured to accept input. In some embodiments, sensor cover <NUM> is at least partially transparent such that an underlying fingerprint sensor can detect patterns of the user's fingerprint.

A perimeter of sensor cover <NUM> is encompassed by trim <NUM>, which can correspond to a rigid ring or frame having an aperture to accommodate sensor cover <NUM>. In some cases, an intermediate layer, such as an adhesive or polymer layer, is positioned between sensor cover <NUM> and display cover <NUM>. In other cases, trim <NUM> is configured to directly engage with sensor cover <NUM> and display cover <NUM> so as to provide a tight fit. In some embodiments, trim <NUM> is composed of a metal material, which can provide sufficient rigidity without being too brittle. However, in some cases trim is composed of other rigid materials such as polymer or ceramic materials. As described in detail below, trim <NUM> can limit motion of the sensor assembly <NUM> once assembled within display cover <NUM>. In addition, trim <NUM> is visible to a user, and therefore can enhance the appearance of sensor assembly <NUM>. Due to its multiple functions, trim <NUM> can be referred to as a bracket, brace, support, washer, ring, band or other suitable term.

Sensor assembly <NUM> can be configured for easy assembly and disassembly. For example, sensor assembly <NUM> can be assembled from the top side of opening <NUM>, and bracket <NUM> can be assembled from the bottom side of opening <NUM>, as shown in <FIG>. Bracket <NUM> can be composed of metal that is grounded to the enclosure of electronic device, and non-conductive portion <NUM> of bracket <NUM> electrically isolates the conductive portions of bracket <NUM> from sensor assembly <NUM>. Since cable portion <NUM> should be positioned beneath display cover <NUM>, cable portion <NUM> can be threaded through opening <NUM>, then trim <NUM> and sensor cover <NUM> can be adjusted to fit snugly within opening <NUM>. Fasteners <NUM> can then be used to secure bracket <NUM>, which supports sensor assembly <NUM>, to display cover <NUM>. In the embodiment of <FIG>, fasteners <NUM> are screws, but may alternatively or additionally include clips, press-fit fasteners, welds, or other suitable fasteners. In some cases, fastener 211a is aligned with a center of opening <NUM> and sensor cover <NUM>.

It should be noted that the shape of sensor assembly <NUM> could vary depending on design requirements. In particular, sensor cover <NUM> and trim <NUM> are not limited to round or circular forms as shown. For example, sensor cover <NUM> and trim <NUM> can have rectangular, triangular, oval or any other suitable shapes.

<FIG> show top views of a portion of electronic device <NUM> having sensor assembly <NUM>. <FIG> shows sensor assembly <NUM> with sensor cover <NUM>, and <FIG> shows sensor assembly <NUM> without sensor cover <NUM>. <FIG> shows that sensor component <NUM> is positioned beneath sensor cover <NUM>. In some embodiments, sensor component <NUM> is a fingerprint sensor or touch sensor. Surrounding sensor component <NUM> is compliant member <NUM>, which corresponds to one or more layers of compliant or resilient material, such a silicone or other polymer. In some cases, compliant member <NUM> includes separate pieces - in this case, four circle segment-shaped pieces to accommodate a rectangular-shaped sensor component <NUM>. It should be noted, however, that compliant member <NUM> can have any suitable shape and include any suitable number of pieces. <FIG> shows sensor assembly <NUM> fully assembled within electronic device <NUM>. As shown, sensor cover <NUM> is surrounded by trim <NUM>, both of which are exposed to a user of electronic device <NUM>. Sensor cover <NUM> also provides a contact surface for a user to contact and activate sensor assembly <NUM>.

<FIG> shows a cross-section view (A-A in <FIG>) of a portion of electronic device <NUM>, showing how sensor assembly <NUM> can be assembled within electronic device <NUM>, in accordance with some embodiments. Trim <NUM> is positioned between sensor cover <NUM> and display cover <NUM>, which is, in turn, coupled to enclosure portion <NUM>. As shown, sensor assembly <NUM> has a very thin cross-section, thereby making room for components such as component <NUM>. In one particular embodiment, component <NUM> is a driver as part of a display assembly. Trim <NUM> includes ledge <NUM>, which supports the backside of sensor cover <NUM>. Compliant member <NUM>, which has a thickness t, is positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. Compliant member <NUM> can be adhered to sensor cover <NUM> and ledge <NUM> by adhesive layers (not shown), such as layers of heat activated film, pressure sensitive adhesive, liquid adhesive, or other suitable adhesive material. In some embodiments, compliant member <NUM> includes holes or channels that accommodate overflow of the adhesive.

Inset <NUM> shows a detail cross-section view of a stack up of sensor assembly <NUM>. Beneath sensor cover <NUM> is fingerprint sensor <NUM>, which is configured to scan a fingerprint of a user through sensor cover <NUM>. In some cases, fingerprint sensor <NUM> is a silicon chip having an array of capacitors and that is in communication with software that can capture a user's fingerprint image and match it with stored fingerprint data. Fingerprint sensor <NUM> can be coupled to sensor cover <NUM> by adhesive <NUM>, which can be an optically transparent adhesive or other suitable adhesive.

Beneath fingerprint sensor <NUM> is touch sensor <NUM>, which in the embodiment of <FIG> is a capacitive touch sensor that includes first layer 402a and second layer 402b. Capacitor module <NUM> is associated with touch sensor <NUM>. In some embodiments, first layer 402a and second layer 402b each correspond to flat flexible materials that include a layer of conductive material (e.g., copper) or other suitable material (e.g., indium tin oxide (ITO)) that are capacitively coupled with respect to one another. First layer 402a is physically coupled to fingerprint sensor <NUM> by first adhesive layer <NUM>, and second layer 402b is physically coupled to stiffener <NUM> by second adhesive layer <NUM> - which can be different or the same types of adhesives. First layer 402a and second layer 402b are spaced apart by gap <NUM> having a distance d such that a change in distance d is detected by a voltage of capacitive change. Distance d can vary depending on design and manufacture of touch sensor <NUM>. Gap <NUM> can be filled with air or other a non-conductive material, such as a compliant gel. In some embodiments, air is found to provide better sensing capability than a gel.

When a user touches exterior surface <NUM> of sensor cover <NUM>, the force is transferred to first layer 402a in a direction <NUM> toward sensor <NUM> (referred to as a sensing direction) and into a pressed position. This, in turn, causes a corresponding reduction in distance d between capacitive layers 402a and 402b, thereby causing a change in voltage or capacitance in touch sensor <NUM>. Touch sensor <NUM> then generates a signal that activates one or more electrical circuits of electronic device <NUM>. Compliant member <NUM> is composed of a compliant material that provides a resistive force (opposite sensing direction <NUM>) that returns sensor cover <NUM>, and therefore also first layer 402a, back to its un-pressed position. Once sensor cover <NUM> is back in its un-pressed position, compliant member <NUM> returns to its full thickness t. Since there is very little space for compliant member <NUM>, thickness t should be very thin. In some cases, thickness is no more than about <NUM> micrometers - in some cases, ranging from about <NUM>-<NUM> micrometers.

The change in distance d sufficient to cause activation of touch sensor <NUM> will depend on the design of touch sensor <NUM>. In general, the required change in distance d will be very small. In some cases, the change in distance d is about <NUM>-<NUM> micrometers (corresponding to a compliance of about <NUM>-<NUM>/gram-force for touch sensor <NUM>). Ledge <NUM> of trim <NUM> acts as a hard stop that prevents the amount of movement of sensor cover <NUM> in sensing direction <NUM>. In particular, ledge prevents first layer 402a from contacting second layer 402b, or otherwise allowing first layer 402a to come too close to second layer 402b. In some cases, deflection in the material of sensor cover <NUM> when pressed by a user can also contribute to changes in distance d. However, this aspect can be factored into the design of sensor assembly <NUM>. In some embodiments, sensor cover <NUM> is composed of a rigid material, such as glass (e.g., sapphire), ceramic or rigid polymer, so as to reduce material deflection effects of sensor cover <NUM>. In some embodiments, sensor cover <NUM> moves from the un-pressed position to the pressed position by a distance of less than about <NUM> micrometers sensing direction <NUM>. In some cases, sensor cover <NUM> moves from the un-pressed position to the pressed position by a distance of less than about <NUM> micrometers. In a particular embodiment, sensor cover <NUM> moves from the un-pressed position to the pressed position by a distance of about <NUM> micrometers.

In addition to a capacitive touch sensor <NUM>, sensor assembly <NUM> can include a piezoelectric or piezoresistive sensor.

Compared to conventional mechanical switches and buttons, sensor assembly <NUM> requires very little physical movement with the assembly itself for activation. This allows for sensor assembly <NUM> to have a much more compact cross-section (z-stack) compared to mechanical switches and buttons, thereby providing more room for other components within electronic device <NUM>, such as component <NUM>. Furthermore, sensor assembly <NUM> may not depend on mechanical contact within touch sensor <NUM>. Instead, sensor <NUM> can utilize small voltage or capacitance changes brought about by a relatively small force input, which may be accomplished using a solid-state sensor. In general, solid-state sensors, such as capacitive touch, piezoelectric and piezoresistive sensors, can include electrical circuits built within solid material, such as semiconductor materials. The relatively non-mechanical aspect of solid-state sensors can make sensor assembly <NUM> less likely to wear out compared to conventional mechanical switches and buttons. Moreover, since sensor assembly <NUM> may require a small force for activation compared to mechanical switches and buttons, this can provide an easier input means for electronic device <NUM> and a better user experience. Furthermore, since the solid-state sensor can require less movement in the sensing direction <NUM> compared to mechanical switches, the cross-section of sensor assembly <NUM> can be smaller (thinner) than that of a mechanical switch assembly.

Other design considerations include features that isolate movement of sensor cover <NUM> when transitioning between the pressed and un-pressed positions. For example, tight engagement of trim <NUM> with display cover <NUM> and sensor cover <NUM> prevents lateral movement of sensor assembly <NUM> with respect to sensing direction <NUM>. Thus, trim <NUM> should have a size and shape in accordance with the size and shape of each of sensor cover <NUM> and the opening of display cover <NUM>. Furthermore, stiffener <NUM> provides rigid support for second layer 402b of touch sensor <NUM>. Stiffener <NUM> is coupled to trim <NUM> via fastening members <NUM>, which in some embodiments are weld spots. This is because in some cases welding is found to provide the strongest bond and provide the most reliable rigidity within the limited space provided for sensor assembly <NUM>. The combination of the above structural features and bracket <NUM> prevents sensor assembly <NUM> from encroaching into internal cavity <NUM> and making contact with component <NUM> during drop events and other large force events.

In the embodiment of <FIG>, trim <NUM> has a chamfered edge <NUM> that corresponds to a chamfered edge <NUM> of display cover <NUM>. This chamfered design creates a hard stop such that sensor assembly <NUM> is not able to intrude within internal cavity <NUM> of enclosure <NUM>. In particular, although bracket <NUM> and fastener 211a support and secure sensor assembly <NUM> to display cover <NUM>, the matching chamfered geometries of trim <NUM> and display cover <NUM> further prevent shifting of sensor assembly <NUM> and encroachment of sensor assembly <NUM> into internal cavity <NUM>. These chamfered geometries can have an advantage over a stepped geometry for manufacturing purposes. In particular, a stepped geometry is more difficult to polish than a chamfered geometry. Furthermore, the angled geometry allows for more flexibility with regard to stack up tolerance compared to stepped geometry. In some embodiments, chamfered edges <NUM> and <NUM> are each chamfered by about <NUM> degrees with respect to outer surface <NUM> of display cover <NUM>. In some embodiments, sensor assembly <NUM> is installed such that exterior surface <NUM> of sensor cover <NUM> is slightly recessed with respect to outer surface <NUM> of display cover <NUM> (in some cases, recessed by about <NUM> micrometers). This recessed configuration of sensor cover <NUM> can help prevent inadvertent activation (i.e., false triggers) of sensor assembly <NUM>.

In some embodiments, sensor assembly <NUM> is configured to provide feedback to a user. For example, sensor assembly <NUM> can be electrically coupled to haptic actuator <NUM> (which can be referred to as a haptic component) that causes electronic device <NUM> to vibrate. This type of haptic feedback is sometimes referred to as taptic feedback, and haptic actuator <NUM> can be referred to as a taptic engine. Additionally or alternatively, sensor assembly <NUM> can be electrically coupled to speaker <NUM> that provides acoustic feedback to the user. In some cases, the combination of both haptic feedback and acoustic feedback creates an experience for a user that mimics depression of a mechanical button or switch. In one embodiment, sensor assembly <NUM> causes speaker <NUM> to produce a very quiet, high pitch and crisp sound that mimics the sound of mechanical button being pressed, and causes haptic actuator <NUM> to produce a very brief vibration that mimics the feel of a mechanical button being pressed. In some cases, haptic actuator <NUM> is able to vibrate and also produce a sound without the addition of sound from speaker <NUM>.

Haptic actuator <NUM> and speaker <NUM> can be located in any suitable part of electronic device <NUM>. For example, haptic actuator <NUM> can positioned at a distal side (not shown) of electronic device <NUM> with respect to sensor assembly <NUM>, and can be activated by other electronic components of electronic device <NUM>. Likewise, speaker <NUM> can be positioned on a sidewall (not shown) of electronic device <NUM>, and can be used to provide other sounds (e.g., ring tones and alerts) to a user. That is, sensor assembly <NUM> can activate haptic actuator <NUM> and/or speaker <NUM>, which are already components of electronic device <NUM> for other purposes. In other embodiments, haptic actuator <NUM> and/or speaker <NUM> are dedicated feedback components for sensor assembly <NUM>. In these designs, it may be beneficial to position haptic actuator <NUM> and/or speaker <NUM> adjacent to sensor assembly <NUM>.

In some embodiments, one or more sealing features provide a moisture barrier from the external environment. For example, seal <NUM> positioned around an internal perimeter of trim <NUM> adjacent to compliant member <NUM> can prevent moisture from the external environment from entering between sensor cover <NUM> and trim <NUM> and contacting fingerprint sensor <NUM> or touch sensor <NUM>, or from entering internal cavity <NUM>. Since seal <NUM> is positioned adjacent to compliant member <NUM>, the material of seal <NUM> should be compliant enough to prevent interference with the compressing and decompressing of compliant member <NUM>. In some cases, seal <NUM> is composed of a very compliant polymer adhesive, such as a silicone-based adhesive.

Seal <NUM> can prevent moisture from entering internal cavity <NUM> between trim <NUM> and display cover <NUM>. In some cases, seal <NUM> is in the form of an O-ring that is positioned within groove <NUM> at an outer perimeter of trim <NUM>. If seal <NUM> is an O-ring, the diameter of the O-ring may need to be smaller than conventionally manufactured since space is so limited in and around sensor assembly <NUM>. In a particular embodiment, the diameter of the O-ring seal <NUM> is less than about <NUM> millimeters.

<FIG> shows a top view of a portion of device <NUM> indicating location of sensor assembly <NUM> in relation to haptic actuator <NUM> and speaker <NUM>, in accordance with some embodiments. As shown, haptic actuator <NUM> and speaker <NUM> can be separate electronic components housed within enclosure <NUM>. In some cases, haptic actuator <NUM> and speaker <NUM> are positioned proximate to and partially under sensor assembly <NUM>. In some instances, haptic actuator <NUM> and speaker <NUM> each serve functions other than solely dictated by sensor assembly <NUM>. For example, haptic actuator <NUM> can provide tactile feedback to a user (e.g., by vibrating enclosure <NUM>) in response to other types of input from a user, such as touch input from the user contacting display <NUM>, or any other suitable signal as dictated by device <NUM> (e.g., phone call, text messages, alarm, etc.). In some cases haptic actuator <NUM> makes a sound when vibrating, thereby also providing acoustic feedback to a user. Speaker <NUM> can be arranged to produce sound that is directed through one or more openings <NUM> within enclosure <NUM>. Speaker <NUM> can produce sound <NUM> in response any suitable signal as dictated by device <NUM> (e.g., user input, phone call, text messages, alarm, etc.). Thus, haptic actuator <NUM> and speaker <NUM> can each have multiple uses and are not solely dedicated to the service of sensor assembly <NUM>. In some embodiments, however, haptic actuator <NUM> and speaker <NUM> are fully dedicated to the responding to signals from sensor assembly <NUM>.

It should be noted that the locations of haptic actuator <NUM> and speaker <NUM> of device <NUM> can vary depending on design needs and are not limited to the locations depicted in <FIG>. In some designs it may be beneficial to have haptic actuator <NUM> and speaker <NUM> positioned proximate to sensor assembly <NUM> so that the user can more readily associate vibrations of haptic actuator <NUM> and noises of speaker <NUM> with pressing of sensor assembly <NUM>. However, in some cases, it may be beneficial to have haptic actuator <NUM> and speaker <NUM> positioned in different locations within device <NUM>. For example, in some designs one or both haptic actuator <NUM> and speaker <NUM> can be located at an opposing side of device <NUM> than the location of sensor assembly <NUM>. Furthermore, the number of haptic actuators <NUM> and speakers <NUM> can vary, depending on desired user experience and design requirements.

<FIG> shows a cross-section view of a portion of electronic device <NUM>, which includes sensor assembly <NUM>, in accordance with some embodiments. Sensor assembly <NUM> is assembled within an opening of enclosure portion <NUM>. In some embodiments, enclosure portion <NUM> corresponds to a display cover that covers a display assembly of electronic device <NUM>. Sensor assembly <NUM> includes fingerprint sensor <NUM> and touch sensor <NUM>. Fingerprint sensor <NUM> is configured to recognize fingerprint features of a user through sensor cover <NUM>. Touch sensor <NUM> is configured to detect input, such as from a user's finger touching exterior surface <NUM> of sensor cover <NUM>. Touch sensor <NUM> can be any suitable solid-state sensor capable of detecting a touch input. In some embodiments, touch sensor <NUM> includes one or more of a capacitive sensor, piezoelectric sensor and piezoresistive sensor. The small cross-section of sensor assembly <NUM> allows for more room within enclosure <NUM> for other components, such as electronic component <NUM>.

Trim <NUM> encompasses a perimeter of sensor cover <NUM> and isolates movement of the sensor cover <NUM> between a pressed position and an un-pressed position. In particular, trim <NUM> prevents lateral movement of sensor cover <NUM> so as to limit movement of sensor cover <NUM> to sensing direction <NUM> (toward touch sensor <NUM>) and a direction opposite sensing direction <NUM>(away from touch sensor <NUM>). Compliant member <NUM> is positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. Compliant member <NUM> can be in the form of a single piece or multiple pieces (e.g., see compliant member <NUM> in <FIG>). When a user applies a force on exterior surface <NUM> of sensor cover <NUM>, thickness t of compliant member <NUM> compresses accordingly. Compliant member <NUM> is configured to provide a return force that returns sensor cover <NUM> back to the un-pressed position from the pressed position.

Sensor cover <NUM> is coupled to first layer 522a of touch sensor <NUM>, and stiffener <NUM> is coupled to second layer 522a of touch sensor <NUM>. Stiffener <NUM> is rigidly coupled to enclosure portion <NUM> via trim <NUM>, thereby keeping second layer 522b stationary with respect to enclosure portion <NUM>. Thus, when sensor cover <NUM> moves in sensing direction <NUM> to a pressed position in response to a force, distance d of gap <NUM> between first layer 522a and second layer 522a is reduced, thereby causing a voltage or capacitance shift within touch sensor <NUM>. In some cases, this voltage or capacitance change causes touch sensor <NUM> to generate a signal that activates one or more components. When compliant member <NUM> returns sensor cover <NUM> to the un-pressed position, gap <NUM> returns to its original distance d, thereby returning the voltage or capacitance to the original voltage. In some cases, the voltage or capacitance change causes touch sensor <NUM> to generate a signal that deactivates the one or more components, and/or that activates one or more other components.

In some embodiments, sensor assembly <NUM> is electrically coupled to haptic actuator <NUM> and/or speaker <NUM>. This configuration allows a touch event from a user to be associated with haptic and/or acoustic feedback to the user. For example, sensor assembly <NUM> can cause speaker <NUM> to produce a clicking sound, and/or cause haptic actuator <NUM> to produce a very brief vibration that simulates pushing of a mechanical switch. Haptic actuator <NUM> and speaker <NUM> can be part of sensor assembly <NUM> itself, or be situated in a different region of electronic device <NUM>.

<FIG> shows a flowchart indicating a process for assembling a sensor assembly within an electronic device. At <NUM>, a trim is positioned around a perimeter of a sensor cover of a sensor assembly. The sensor cover can have a round, rectangular, triangular, oval or other suitable shape, with the trim having a correspondingly shaped aperture. At <NUM>, one or more moisture seals positioned around the trim. In one embodiment, moisture seal has an O-ring shape and is positioned within a groove at an outer perimeter of the trim. The moisture seal can be composed of a compliant material, such as silicon or other polymer material.

At <NUM>,the sensor assembly is positioned within an opening of an enclosure for an electronic device. The sensor assembly can be assembled within a wall of the enclosure, such as a transparent, glass display cover for the electronic device, or an opaque metal or plastic wall of the enclosure. The opening should have a shape corresponding to that of the outer perimeter of the trim such that a tight fit between the two is achieved. In some cases, the sensor assembly is assembled from a top side of the opening while a bracket is assembled from a bottom side of the opening <NUM>. In some cases, this involves bending and threading a cable portion of the sensor assembly within the opening before adjusting the trim and the sensor cover snugly within opening. In some cases, a top surface of the sensor cover is recessed with respect to a top surface of the enclosure.

At <NUM>, the sensor assembly is secured to the enclosure. In some embodiments, the bracket supports a bottom portion of the sensor assembly with respect to the enclosure. Fasteners, such as screws or welds, can be used to secure the bracket and the sensor assembly to the enclosure. In some cases, the fasteners are tightened in a manner such that chamfered interfaces between the trim and enclosure tightly engage with one another.

<FIG> show cross-section views of sensor assembly mounting configurations, in accordance with some embodiments. <FIG> shows sensor assembly <NUM>, which is assembled within electronic device <NUM>. Sensor assembly <NUM> includes sensor cover <NUM> having a perimeter that is encompassed by trim <NUM>. Trim <NUM> is positioned between and engages both sensor cover <NUM> and enclosure portion <NUM>. In some embodiments, enclosure portion <NUM> corresponds to a display cover that covers a display assembly of electronic device <NUM>. As show, trim <NUM> has a chamfered edge <NUM>, which engages with corresponding chamfered edge <NUM> of enclosure portion <NUM>. In some cases, the geometries of chamfered edges <NUM> and <NUM> are chosen such that exterior surface <NUM> of sensor cover <NUM> is recessed with respect to exterior surface <NUM> of enclosure portion <NUM>. The chamfered edge mounting configuration shown in <FIG> is similar to that of <FIG>, described above.

One of the advantages of the mounting configuration of <FIG> is chamfered edge <NUM> of trim <NUM> can secure sensor cover <NUM> around its full perimeter, thereby preventing a user from being able to push sensor assembly <NUM> into internal cavity <NUM> or putting pressure onto electronic component <NUM>. This can be of particular importance if electronic component <NUM> includes relatively fragile components, such as a silicon chip. In some embodiments, electronic component <NUM> includes a driver as part of a display assembly. Furthermore, chamfered edges <NUM> and <NUM> secures sensor assembly <NUM> so well that sensor assembly <NUM> does not encroach within cavity <NUM> or put significant pressure on electronic component <NUM> even when electronic device <NUM> experiences a drop event or other high impact events. Another advantage of the mounting configuration of <FIG> is that chamfered edges <NUM> and <NUM> can localize the pressure from a user's finger in a sensing direction <NUM>.

<FIG> shows sensor assembly <NUM> is assembled within electronic device <NUM>. Instead of a trim, sensor assembly <NUM> is supported by back plate <NUM>. Back plate <NUM> is coupled to both sensor cover <NUM> and enclosure portion <NUM>, and is positioned below sensors <NUM> and <NUM>. In some embodiments, sensor <NUM> corresponds to a portion of a touch sensor and sensor <NUM> corresponds to a portion of a fingerprint sensor. Back plate <NUM> can be coupled to enclosure portion <NUM> and/or sensor cover <NUM> by an adhesive or by engagement from an insert molding process. For example, back plate <NUM> can be composed of a plastic material that is molded onto enclosure portion <NUM>. In some embodiments, exterior surface <NUM> of sensor cover <NUM> is recessed with respect to exterior surface <NUM> of enclosure portion <NUM>.

One of the advantages of the mounting configuration of <FIG> is that back plate <NUM> can be not visible to a user, which may provide a cosmetic advantage in some applications. Furthermore, this configuration can localize the pressure from a user's finger to a sensing direction <NUM>. Moreover, because of its position, back plate <NUM> can provide strong support for sensor assembly <NUM> such that sensor assembly <NUM> does not encroach in internal cavity <NUM> or contact electronic component <NUM>. However, this configuration may provide less support at the top of sensor assembly <NUM> than those embodiments that include a trim. This factor may not be important, however, depending on the particular application and other design considerations of electronic device <NUM>.

<FIG> shows sensor assembly <NUM> is assembled within electronic device <NUM>. In this embodiment, enclosure portion <NUM> corresponds to a display cover that covers a display assembly of electronic device <NUM>. In a particular embodiment, at least part of enclosure portion <NUM> is at least partially transparent such that the underlying display is viewable through enclosure portion <NUM>. Instead of a separate sensor cover, enclosure portion <NUM> covers sensor assembly <NUM>. That is, part of enclosure portion <NUM> acts as a sensor cover. In some embodiments, the portion covering sensor assembly <NUM> is locally thinned so as to provide a recess <NUM> within enclosure portion <NUM>. Recess <NUM> may be detectable by a user when the user touches enclosure portion <NUM> (and in some cases visually detectable by a user) and act as a guide so that the user can locate sensor assembly <NUM>. In other embodiments, recess <NUM> is located within an interior surface of enclosure portion <NUM> (i.e., backside of enclosure portion <NUM> adjacent to sensor <NUM>.

One of the advantages of the mounting configuration of <FIG> is that enclosure portion <NUM> provides a continuous surface that covers the display and sensor assembly <NUM> of electronic device <NUM>. This can provide good protection to sensor assembly <NUM> from liquids or other agents without the use of seals. Furthermore, the continuous surface of enclosure portion <NUM> may be cosmetically appealing in some applications. However, this configuration may limit the movement of sensor assembly <NUM> in sensing direction <NUM>. In particular, since enclosure portion <NUM> cover sensor assembly <NUM>, movement of sensor assembly <NUM> in sensing direction <NUM> depends on deflection of the material of enclosure portion <NUM>, which can limit the amount of movement in sensing direction <NUM>. Depending on the material of enclosure portion <NUM>, this can make it more difficult for a user to depress sensor assembly <NUM> sufficiently for actuation. Furthermore, if the material of enclosure portion <NUM> is sufficiently flexible, a user's touch input may cause sensor assembly <NUM> to encroach into internal cavity <NUM> or touch electronic component <NUM>. These factors may not be important, however, depending on the particular application and other design considerations of electronic device <NUM>.

<FIG> show cross-section views of sensor assembly sealing configurations, in accordance with some embodiments. <FIG> shows sensor assembly <NUM> positioned within an opening of enclosure portion <NUM> of electronic device <NUM>. For simplicity, sensor assembly <NUM> and trim <NUM> are shown as a single block. Inset <NUM> shows a detailed view of an interface region between trim <NUM> and enclosure portion <NUM>, at which seal <NUM> is positioned. Seal <NUM> prevents moisture from entering between trim <NUM> and enclosure portion <NUM>. In some cases, seal <NUM> is in the form of an O-ring that is positioned within groove <NUM> at an outer perimeter of trim <NUM>. The embodiment shown in <FIG> has a similar sealing configuration as that of <FIG>.

<FIG> shows sensor assembly <NUM> positioned within an opening of enclosure portion <NUM> of electronic device <NUM>. For simplicity, sensor assembly <NUM> and trim <NUM> are shown as a single block. Inset <NUM> shows a detailed view of an interface region between trim <NUM> and enclosure portion <NUM>, at which adhesive <NUM> is positioned. Like seal <NUM> described above, adhesive <NUM> prevents moisture from entering between trim <NUM> and enclosure portion <NUM>. Adhesive <NUM> can be composed of any suitable adhesive, including one or more of heat activated film, pressure sensitive adhesive, liquid adhesive, or other suitable adhesive material. In some embodiments, trim <NUM> includes groove <NUM> that accommodates adhesive <NUM>.

<FIG> shows sensor assembly <NUM> positioned within an opening of enclosure portion <NUM> of electronic device <NUM>. For simplicity, sensor assembly <NUM> and trim <NUM> are shown as a single block. Inset <NUM> shows a detailed view of an interface region between trim <NUM> and enclosure portion <NUM>, at which adhesive <NUM> is positioned. Adhesive <NUM> prevents moisture from entering between trim <NUM> and enclosure portion <NUM>. Adhesive <NUM> can be composed of any suitable adhesive, including one or more of heat activated film, pressure sensitive adhesive, liquid adhesive, or other suitable adhesive material. In the embodiment of <FIG>, adhesive <NUM> is positioned within space <NUM> between trim <NUM> and enclosure portion <NUM>. The magnitude of space <NUM> depends on an offset of chamfer <NUM> of trim <NUM> and chamfer <NUM> of enclosure portion <NUM>. In one embodiment, chamfer <NUM> of trim <NUM> is larger than chamfer <NUM> of enclosure portion <NUM>.

<FIG> shows sensor assembly <NUM> positioned within an opening of enclosure portion <NUM> of electronic device <NUM>. For simplicity, sensor assembly <NUM> and trim <NUM> are shown as a single block. Inset <NUM> shows a detailed view of an interface region between trim <NUM> and enclosure portion <NUM>. Gasket <NUM> is positioned on interior surfaces of trim <NUM> and enclosure portion <NUM>, and is configured to prevent moisture from entering between trim <NUM> and enclosure portion <NUM>. Gasket <NUM> can be composed of any suitable material, including one or more polymer materials, such as silicone. In some cases, gasket <NUM> is adhered to interior surfaces of trim <NUM> and/or enclosure portion <NUM> by an adhesive. In some embodiments, gasket <NUM> is composed of a waterproof plastic and is adhered to interior surfaces of trim <NUM> and enclosure portion <NUM> via a stack of adhesives. Since gasket <NUM> is accessible from the interior of the enclosure, this configuration allows gasket <NUM> to be assembled before or after assembling sensor assembly <NUM>.

<FIG> shows sensor assembly <NUM> positioned within an opening of enclosure portion <NUM> of electronic device <NUM>. For simplicity, sensor assembly <NUM> and trim <NUM> are shown as a single block. Inset <NUM> shows a detailed view of an interface region between trim <NUM> and enclosure portion <NUM>. Potting <NUM> is positioned on interior surfaces of trim <NUM> and enclosure portion <NUM>, and is configured to prevent moisture from entering between trim <NUM> and enclosure portion <NUM>. Potting <NUM> can include one or more an adhesive material that is applied to interior surfaces of trim <NUM> and/or enclosure portion <NUM>. Potting <NUM> should be applied in a sufficiently flowable state such that portions of potting <NUM> flows between trim <NUM> and/or enclosure portion <NUM>. Once dried and hardened, potting <NUM> provides sufficient sealing. Potting <NUM> can be applied before or after assembling sensor assembly <NUM>.

<FIG> show cross-section and top views of electronic device <NUM> having a trimless sensor assembly configuration, in accordance with some embodiments. <FIG> show top views of a portion of electronic device <NUM> having sensor assembly <NUM>. <FIG> shows sensor assembly <NUM> with sensor cover <NUM>, and <FIG> shows sensor assembly <NUM> without sensor cover <NUM>. <FIG> shows cross-section view at B-B of <FIG>.

<FIG> shows that sensor cover <NUM> is adjacent to display cover <NUM> without a trim between them. <FIG> shows that sensor component <NUM> is positioned beneath sensor cover <NUM>. In some embodiments, sensor component <NUM> is a fingerprint sensor or touch sensor. Surrounding sensor component <NUM> is mounting ring <NUM>, which, in turn, is surrounded by compressible gasket <NUM>.

<FIG> shows that sensor cover <NUM> is adjacent display cover <NUM> without a trim, and that display cover <NUM> is coupled to enclosure portion <NUM>. Mounting ring <NUM> supports sensor cover <NUM> and is positioned between sensor cover <NUM> and stiffener <NUM>. Sensor assembly <NUM> is coupled to display cover <NUM> by fastener <NUM>. In some embodiments, mounting ring <NUM> is composed of a conductive material (e.g., metal) that capacitively senses the presence of a finger at exterior surface <NUM> of sensor cover <NUM>. That is mounting ring <NUM> is configured to capacitively detect the presence of a finger through sensor cover <NUM>.

Compressible gasket <NUM> is positioned between sensor cover <NUM> and ledge <NUM> of display cover <NUM>. Compressible gasket <NUM> can be made of any suitable compressible material, including one or more polymers or adhesives. In some embodiments, compressible gasket <NUM> is composed of layers of compressible materials. Compressible gasket <NUM> can be in the form of a single piece or have multiple pieces. In some cases, compressible gasket <NUM> has a round ring shape that corresponds to a round shape of sensor cover <NUM>. When a user touches exterior surface <NUM> of sensor cover <NUM>, the thickness of compressible gasket <NUM> reduces in the sensing direction <NUM>. The force is transferred to first capacitive layer 922a, thereby reducing a distance between first capacitive layer 922a and second capacitive layer 922b. This, in turn, causes a change in voltage or capacitance of touch sensor <NUM>. Touch sensor <NUM> then generates a signal that activates one or more electrical circuits of electronic device <NUM>. Compressible gasket <NUM> is composed of a compliant material that provides a resistive force (opposite sensing direction <NUM>) that returns sensor cover <NUM> back to its un-pressed position. Once sensor cover <NUM> is back in its un-pressed position, compressible gasket <NUM> returns to its full thickness.

<FIG> show cross-section and top views of sensor assembly <NUM> that is configured to vibrate, in accordance with some embodiments. <FIG> shows a top view of a portion of electronic device <NUM> having sensor assembly <NUM>. <FIG> shows cross-section view at C-C of <FIG>. <FIG> shows cross-section view D-D of <FIG>. <FIG> shows cross section view E-E of <FIG>.

<FIG> shows piezoelectric actuator <NUM> is located adjacent to sensor assembly <NUM>. Piezoelectric actuator <NUM> is configured to vibrate sensor assembly <NUM> in response to a user touching sensor cover <NUM>. <FIG> shows that the perimeter of sensor cover <NUM> is surrounded by movable trim <NUM>, which is, in turn, surrounded by stationary trim <NUM>. Movable trim <NUM> can be composed of a compressible and compliant material, such as a compliant polymer (e.g., silicone). Stationary trim <NUM> can be made of a relatively rigid material, such as metal. In some embodiments, stationary trim <NUM> corresponds to a metal ring. In some cases, stationary trim <NUM> has a chamfered edge that engages with a chamfered edge of display cover <NUM>.

Seal <NUM> is positioned between movable trim <NUM> and stationary trim <NUM>, and is configured to prevent entry of water or other liquid between movable trim <NUM> and stationary trim <NUM>. In some embodiments, seal <NUM> is composed of a compressible material, such as a flexible polymer. The shape and size of seal <NUM> will be in accordance with space limitations within sensor assembly <NUM>. In some embodiments, seal <NUM> has an O-ring shape. In some embodiments, movable trim <NUM> has groove <NUM> and stationary trim <NUM> has groove <NUM>, which accommodate seal <NUM>. Sensor component <NUM> can correspond to a portion of one or more sensors, such as a fingerprint sensor that detects features of a user's fingerprint and/or a touch sensor that detects a user's touch.

Display cover <NUM> is supported by cover frame <NUM>, which is, in turn, coupled to enclosure portion <NUM>. In some embodiments, cover frame <NUM> is composed of a reinforced glass fiber material, such as a glass-fiber reinforced with polyamide. Flange <NUM> is positioned between display cover <NUM> is and cover frame <NUM> and provides extra support for display cover <NUM>. In some embodiments, flange <NUM> is composed of a rigid metal, such a stainless steel. Retaining post <NUM> is positioned below sensor component <NUM>. Bracket <NUM> supports stationary actuator beam <NUM>, which is coupled to piezoelectric actuator <NUM>. When sensor component <NUM> detects a touch from a user, sensor component <NUM> generates a signal that activates piezoelectric actuator <NUM>. Piezoelectric actuator <NUM> then causes portions of sensor assembly <NUM> to move up and down (i.e., vibrate) along plane Z. For example, piezoelectric actuator <NUM> can be configured to move sensor assembly <NUM> such that a user feels sensor cover <NUM> vibrate in response to the input. That is, sensor assembly <NUM> can provide tactile feedback (output) that the user can feel, and that signals to the user that sensor assembly <NUM> has been activated.

The cross-section view of <FIG> shows retaining post <NUM> can be secured to bracket <NUM> by retaining clip <NUM>. Bracket <NUM> is coupled to stationary trim <NUM> via welds <NUM>. Retaining post <NUM> is coupled to and supports movable trim <NUM>. The cross-section view of <FIG> shows that stationary actuator beam <NUM> is held stationary by bracket <NUM>. Flexure dome <NUM>, which can be composed of resilient but stiff material (e.g., metal), is coupled one end to connector <NUM> via weld <NUM> and on another end to stationary actuator beam <NUM> via weld <NUM>. Connector <NUM> is coupled to piezoelectric actuator <NUM> (not shown). When sensor component <NUM> detects an input, sensor component <NUM> generates a signal that activates piezoelectric actuator <NUM>. In response, piezoelectric actuator <NUM> pushes connector <NUM> in a push direction <NUM>. Connector <NUM> slides along stationary actuator beam <NUM> and causes flexure dome <NUM> to flex and push up on and release stiffener <NUM>. Stiffener <NUM> then causes movable trim <NUM> compress and decompress, thereby causing sensor cover <NUM> to move up and down (i.e., vibrate) along plane Z.

<FIG> show cross-section views of sensor assemblies having different sensing configurations, in accordance with some embodiments. The embodiments in <FIG> include architectures that allow for detection of a force input in a less localized bases (i.e., not just directly underneath a sensor cover).

<FIG> shows electronic device <NUM>, which includes sensor assembly <NUM>. Sensor assembly <NUM> includes sensor cover <NUM>, which is surrounded by trim <NUM> and positioned with an opening within display cover <NUM>. Display cover <NUM> is coupled to enclosure portion <NUM>. Bracket <NUM> secures sensor assembly <NUM> to enclosure portion <NUM>. Fingerprint sensor <NUM> is configured to recognize fingerprint features of a user through sensor cover <NUM>. Sensor assembly <NUM> has an active area-based force-sensing configuration. In particular, when a user touches or presses on sensor cover <NUM>, the force will deflect display cover <NUM>, thereby reducing distance <NUM> between display cover <NUM> and component <NUM>. This activates force sensor <NUM> (e.g., a flex capacitive sensor) that is positioned between display cover <NUM> and component <NUM>. This configuration allows for sensing in an area around sensor cover <NUM>.

<FIG> shows electronic device <NUM>, which includes sensor assembly <NUM>. Sensor assembly <NUM> includes sensor cover <NUM>, which is surrounded by trim <NUM> and positioned with an opening within display cover <NUM>. Display cover <NUM> is coupled to enclosure portion <NUM> (which includes enclosure sections 1130a and 1130b). Bracket <NUM> secures sensor assembly <NUM> to enclosure sections 1130a and 1130b. Fingerprint sensor <NUM> is configured to recognize fingerprint features of a user through sensor cover <NUM>. Sensor assembly <NUM> has a display cover-to-enclosure sensing configuration. In particular, when a user touches or presses on sensor cover <NUM>, the force will deflect display cover <NUM>, thereby reducing distance <NUM> between bracket <NUM> and enclosure section 1130a. This activates force sensor <NUM> (e.g., a flex capacitive sensor) that is positioned between bracket <NUM> and enclosure section 1130a.

<FIG> shows electronic device <NUM>, which includes sensor assembly <NUM>. Sensor assembly <NUM> includes sensor cover <NUM>, which is surrounded by trim <NUM> and positioned with an opening within display cover <NUM>. Display cover <NUM> is coupled to enclosure portion <NUM>. Bracket <NUM> secures sensor assembly <NUM> to enclosure portion <NUM>. Fingerprint sensor <NUM> is configured to recognize fingerprint features of a user through sensor cover <NUM>. Sensor assembly <NUM> has an external module-based force-sensing configuration. In particular, when a user touches or presses on sensor cover <NUM>, the force will deflect display cover <NUM>, thereby reducing distance <NUM> between sensory assembly <NUM> and bracket <NUM>. In some embodiments, distance <NUM> is between stiffener <NUM> of sensor assembly <NUM> and bracket <NUM>. This activates force sensor <NUM> (e.g., a flex a capacitive sensor) that is positioned between sensory assembly <NUM> and bracket <NUM>.

<FIG> shows a perspective view of bracket <NUM>, which is incorporated within the sensor assembly <NUM> configuration of <FIG>, in accordance with some embodiments. Bracket <NUM> includes relief cut <NUM>, which can improve signal from small relative deflections of display cover <NUM>. In some embodiments, bracket <NUM> can include conductive portion <NUM> (e.g., composed of metal) and non-conductive portion <NUM> (e.g., plastic), which electrically isolates the conductive portion <NUM>. As shown, non-conductive portion <NUM> can include openings <NUM> for fasteners (not shown). Bracket <NUM> is shown as a single piece. However, in other embodiments, a bracket having multiple pieces is used.

<FIG> show cross-section views of a portion of an electronic device with sensor assembly <NUM> before and during a bonding operation, respectively, in accordance with some embodiments. <FIG> shows sensor assembly <NUM> prior to a bonding operation, where compliant member <NUM> is positioned between sensor cover <NUM> and trim <NUM>. In some embodiments, compliant member <NUM> includes one or more layers of compliant or resilient material, such a silicone or other polymer. As described above with compliant member <NUM> in <FIG>, compliant member <NUM> can be one piece or include separate pieces (e.g., four circle segment-shaped pieces to accommodate a rectangular-shaped sensor component). It should be noted, however, that compliant member <NUM> can have any suitable shape and include any suitable number of pieces. Adhesive layer 1209a is applied between compliant member <NUM> and sensor cover <NUM>, and adhesive layer 1209b is applied between compliant member <NUM> and ledge <NUM> of trim <NUM>, in order to secure compliant member <NUM> to sensor cover <NUM> and trim <NUM>. Adhesive layers 1209a and 1209b can include any one or more suitable adhesive materials, such as layers of heat-activated film, pressure-sensitive adhesive, liquid adhesive, or other suitable adhesive material.

<FIG> shows sensor assembly <NUM> during a bonding operation, where a force is applied to sensor cover <NUM> toward ledge <NUM> of trim <NUM>. As shown, if adhesive layers 1209a and 1209b are in liquid or semi-liquid form, adhesive layers 1209a and 1209b can cause overflow <NUM> to form around the sides of compliant member <NUM>. After adhesive layers 1209a and 1209b dry and harden, overflow <NUM> can be stiffer than the material of compliant member <NUM>, which may reduce the compliance of compliant member <NUM>.

<FIG> show sensor assembly configurations for preventing adhesive overflow <NUM> from occurring. <FIG> shows a top view and a cross-section A-A view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly <NUM> without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section A-A view shows that compliant member <NUM> is positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. The thickness t1 of adhesive layer 1309a and thickness t2 of adhesive layer 1309b are each thin enough to eliminate or reduce the occurrence of overflow, yet are thick enough to adhere compliant member <NUM> to sensor cover <NUM> and trim <NUM>. In some embodiments, the total thickness (t1 + t2) of adhesive layers 1309a and 1309b is about <NUM> micrometers.

<FIG> shows a top view and a cross-section B-B view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly <NUM> without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section B-B view shows compliant member <NUM> positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. In this embodiment, the total thickness (t3 + t4) of adhesive layers 1319a and 1319b, respectively, is larger than the total thickness (t1 + t2) of adhesive layers 1309a and 1309b described above with reference to <FIG>. This greater amount of adhesive material can increase the bond strength of compliant member <NUM> to sensor cover <NUM> and trim <NUM> compared to thinner adhesive layers. In some embodiments, the total thickness (t3 + t4) is about <NUM> micrometers. In some cases, however, these larger thicknesses t3 and t4 can increase the risk of overflow around the edges of compliant member <NUM>, such as described above with reference to FIG.

<FIG> shows a top view and a cross-section C-C view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly <NUM> without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section C-C view shows compliant member <NUM> positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. Prior to applying a force during a bonding operation (e.g., see FIG. 2B), adhesive layer 1329a covers less surface area of compliant member <NUM> and has lesser volume of adhesive material than adhesive layer 1329b. This configuration can eliminate or reduce the amount of overflow at the top edges of compliant member <NUM>. In particular, when a force is applied during a bonding operation, both adhesive layers 1329a and1329b will spread toward the edges of compliant member <NUM>. Since adhesive layer 1329a has a lesser volume, adhesive layer 1329a will not overflow or will overflow very little. This configuration can be useful in embodiments where less adhesive material is needed to adequately adhere compliant member <NUM> to sensor cover <NUM> compare to an amount of adhesive material needed to adequately adhere compliant member <NUM> to trim <NUM>.

<FIG> shows a top view and a cross-section D-D view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section D-D view shows compliant member <NUM> positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. In this embodiment, both adhesive layers 1339a and 1339b cover less surface area of compliant member <NUM> and have lesser volume of adhesive than the embodiment of <FIG>. This configuration can eliminate or reduce the amount of overflow at the top and bottom edges of compliant member <NUM> once a force is applied during a bonding operation (see FIG. Care should be taken, however, to assure that adhesive layers 1339a and 1339b have enough volume to adequately bond compliant member <NUM> with sensor cover <NUM> and trim <NUM>. In some cases, this may mean increasing tolerances during the manufacturing process.

<FIG> shows a top view and a cross-section E-E view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly <NUM> without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section E-E view shows compliant member <NUM> positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. In this embodiment, adhesive layers 1349a and 1349b are in a staggered configuration. In particular, adhesive layer 1349a is positioned closer to first end <NUM> of compliant member <NUM>, and adhesive layer 1349b is positioned closer to second end <NUM> of compliant member <NUM>. In some cases, adhesive layers 1349a and 1349b do not over lap at middle portion <NUM> of compliant member <NUM>. When a force is applied during a bonding operation, any overflow will be directed to opposing ends of compliant member <NUM> (i.e., first end <NUM> and second end <NUM>). This prevents joining of any of the overflow of adhesive layers 1349a and 1349b at the edges of compliant member <NUM>. Note that care should be taken to assure that the load applied during the bonding operation is even despite the staggered adhesive layer configuration.

<FIG> shows a top view and a cross-section F-F view of a portion of an electronic device having sensor assembly <NUM>. The top view shows sensor assembly <NUM> without sensor cover <NUM>, thereby exposing sensor component <NUM> (e.g., fingerprint sensor). The cross-section F-F view shows compliant member <NUM> positioned between sensor cover <NUM> and ledge <NUM> of trim <NUM>. In this embodiment, compliant member <NUM> includes recesses <NUM>, which correspond to channels that provide space for adhesive layer 1259a to flow into during the bonding operation (e.g., as shown in <FIG>), thereby preventing overflow of adhesive material around the outer edges of compliant member <NUM>. Furthermore, this configuration can enhance an even distribution of adhesive layer 1259a at the surface of compliant member <NUM>. Recesses <NUM> can have any suitable shape and are not limited to the elongated channel shapes shown in <FIG>. For example, the recesses can be circular, triangular, rectangular, and/or chevron shaped. In some embodiments, recesses are on an opposing side of compliant member <NUM> in order to accommodate adhesive layer 1259b. In some embodiments, two sides of compliant member <NUM> include recesses in order to accommodate adhesive layer 1259a and adhesive layer 1259b.

Claim 1:
A portable electronic device (<NUM>), comprising:
an enclosure (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) at least partially defining an internal cavity (<NUM>, <NUM>, <NUM>, <NUM>);
a display cover (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) coupled with the enclosure (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and defining an opening (<NUM>);
a sensor assembly (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) carried by the enclosure (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and at least partially disposed in the internal cavity (<NUM>, <NUM>, <NUM>, <NUM>), comprising:
a sensor cover (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) disposed within the opening (<NUM>);
a solid-state sensor (<NUM>) comprising a first capacitive layer (402a, 402b) and a second capacitive layer (402a, 402b), the solid-state sensor (<NUM>) configured to provide a signal in response to a touch input on the sensor cover (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) moving the sensor cover (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and causing a reduction in distance (d) between the first capacitive layer (402a, 402b) and the second capacitive layer (402a, 402b);
a fingerprint sensor (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) positioned between the sensor cover (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and the solid-state sensor (<NUM>); and
a haptic actuator (<NUM>) configured to provide, based on the signal, a vibration that mimics a mechanical button press.