ROCKER INPUT MECHANISM

Abstract

A rocker input mechanism includes an actuator that is operable to pivot against the interior surface of a housing through which an actuation surface of the actuator projects. Pivots or up-stops on the edges of the actuator are biased against the interior surface by dome switches contacting a switching surface of the actuator that is opposite the actuation surface. Thus, the actuator is able to pivot with respect to the interior surface to activate the dome switches when force is exerted on the actuation surface without bending or flexing like typical rocker buttons. As a result, the rocker input mechanism may have a feel to a user similar to non-rocking input mechanisms like single mode buttons.

Description

FIELD

The described embodiments relate generally to input mechanisms. More particularly, the present embodiments relate to a rocker input mechanism pivotally engaged with a surface though which the input mechanism projects.

BACKGROUND

Electronic devices may utilize a variety of different input mechanisms to receive input from users. Input received from these input mechanisms may be used to control or otherwise change the state of the electronic device. Many electronic devices may include a number of different types of input mechanisms.

One example of an input mechanism is a button or switch. Buttons typically include an actuator that can be pressed to activate a dome switch or other activation assembly. Input from these buttons may generally be interpretable as indicating whether or not the button has been pressed.

Dual rocker buttons or switches may provide the ability to distinguish between multiple inputs. Rather than a binary press or not pressed state, dual rocker buttons may be able to receive presses in two different regions. This dual input ability may be used to receive input to increase and decrease a volume or other setting, navigate directionally in a menu, and so on.

Typically, dual rocker buttons include an elongated actuator with an upper surface that projects through a housing surface and a lower surface mounted on a pivot. Sides of the upper surface may be pressed to pivot the elongated actuator in a particular direction on the pivot, activating one of two domes switches or other activation assemblies positioned under the lower surface on either side of the pivot. This operation causes the elongated actuator to bend or flex to some degree when force is exerted, giving dual rocker buttons a different feel to users than typical single mode buttons.

SUMMARY

The present disclosure relates to a rocker input mechanism. A rocker input mechanism includes an actuator that pivots against the interior surface of a housing through which an actuation surface of the actuator projects. Pivot portions or up-stops on a lip of the actuator are biased against the interior surface by dome switches contacting a switching surface of the actuator that is opposite the actuation surface. The lip may limit the amount the actuator can pivot and may prevent decoupling of the actuator from the housing. Thus, the actuator is able to pivot with respect to the interior surface to activate the dome switches when force is exerted on the actuation surface without bending or flexing like typical rocker buttons. As a result, the rocker input mechanism may have a feel to a user similar to non-rocking input mechanisms like single mode buttons.

In various embodiments, an electronic device includes a housing and a rocker input mechanism. The housing includes an external surface and an internal surface opposite to the external surface. The housing defines an aperture extending from the external surface to the internal surface. The rocker input mechanism includes a button positioned in the aperture. The button has an actuation surface defining first and second actuation regions, a switching surface opposite the actuation surface, a retention lip that has a dimension larger than the aperture and engages the internal surface, and a pivot portion disposed on the retention lip between the first and second actuation regions that pivots against the internal surface.

In some examples, the pivot portion is biased toward the housing. The pivot portion may be biased toward the housing by a dome switch. The pivot portion may have a sloped edge.

In numerous examples, the switching surface includes first and second contact areas that respectively correspond to the first and second actuation regions. The first and second contact areas respectively engage first and second switches.

In some examples, the actuation surface may be flush with the external surface. In other examples, the actuation surface may be recessed into the exterior surface.

In some embodiments, an input mechanism assembly may include a pair of switches, a plate defining an aperture, and an actuator. The actuator is partially positioned in the aperture, pivots against the plate, and is biased toward the plate by the pair of switches.

In various examples, the actuator includes a ring that is separated from the plate by a gap. The actuator may pivot against the plate using an up-stop positioned on the ring. The ring may be operable to constrain motion of the actuator with respect to the plate. A first portion of the ring may move closer to the plate and a second portion of the ring may move farther from the plate when the actuator actuates one of the switches. The ring may contact the plate prevent decoupling of the actuator from the plate

In some examples, the switches produce signals indicating whether or not force is exerted on the actuator. In other examples, the switches produce signals indicating an amount of force exerted on the actuator.

In numerous embodiments, an electronic device includes a substrate, a housing, an activator positioned between the substrate and the housing and projecting through the housing, and a rib coupled to the activator that prevents simultaneous activation by the activator of first and second dome switches coupled to the substrate. The activator is pivotally engaged with the housing. A portion of the activator moves transverse to the housing to activate the first and second dome switches.

In various examples, the electronic device further includes a shim coupled to the substrate. The rib engages the shim to prevent simultaneous activation of the first and second dome switches by the activator. The rib may be separated from the shim absent force exerted on the activator. The shim may be positioned between the first and second dome switches.

In some examples, the activator is in contact with the first dome switch when activating the second dome switch. The activator may contact the first and second dome switches in absent force exerted on the activator.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 depicts an electronic device having a rocker input mechanism;

FIG. 2A depicts a top down view of the actuator of FIG. 1 with other components removed for clarity;

FIG. 2B depicts a side view of the actuator of FIG. 2A;

FIG. 2C depicts an underside view of the actuator of FIG. 2A; and

FIG. 3A depicts a partial cross-sectional view of the electronic device of FIG. 1, taken along line A-A of FIG. 1;

FIG. 3B depicts the view of FIG. 3A when the second actuation region of the rocker input mechanism is actuated;

FIG. 3C depicts the view of FIG. 3A when the first actuation region of the rocker input mechanism is actuated;

FIG. 4 depicts a method for constructing a rocker button. This method may construct the rocker input mechanism illustrated in FIGS. 1-3C.

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

The following disclosure relates to a rocker input mechanism. An actuator is positioned in an aperture defined in a housing and is biased toward the housing by dome switches or other activation assemblies or biasing structures underneath the actuator. Pivot portions on a lip of the actuator contact an internal surface of the housing such that the actuator rotates with respect to the housing. The lip may limit travel of the actuator (for example, while pivoting) and may prevent decoupling of the actuator from the housing. Force exerted on the top surface of the actuator causes the actuator to pivot and activate one of the dome switches. Due to the configuration of the pivot portion and a biasing structure, the actuator does not bend or flex when force is exerted thereon.

A rib or similar component may be positioned underneath the actuator in between where the actuator contacts the dome switches. The rib may engage a shim or portion of a substrate over which the actuator is positioned when force is exerted on the actuator. This may prevent the unpressed side of the actuator from contacting the dome switch underneath when force is exerted on the pressed side. As a result, a force exerted on one side of the actuator may activate a dome switch only beneath that side of the actuator.

These and other embodiments are discussed below with reference to FIGS. 1-4. However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these Figures is for explanatory purposes only and should not be construed as limiting.

FIG. 1 depicts an electronic device 100 having a rocker input mechanism assembly, which is discussed in more detail below with respect to FIG. 2A. The rocker input mechanism assembly includes an actuator 102, button, or activator that projects at least partially through an aperture 103 defined by a housing 101, top plate, panel, plate, or mount plate of the electronic device 100. The actuator 102 may pivot against an internal surface of the housing using one or more pivots or pivot portions positioned on a retaining ring or retention lip of the actuator 102 that are biased against the internal surface by dome switches or other activation assemblies. Thus, the actuator 102 may pivot such that a portion of the actuator 102 translates about the pivot portion 205 in a direction transverse to the housing 101 when force is exerted on actuation areas of the actuator 102 without bending or flexing.

FIG. 1 depicts the electronic device 100 as a remote control. The actuator 102 can be used to provide dual state input (such as to increase and decrease a volume or other setting, to navigate directionally such as up or down, and so on). However, it is understood that this is an example. In various implementations, the disclosed rocker input mechanism may be used with a variety of different devices without departing from the scope of the present disclosure, such as laptop computing devices, desktop computing devices, keyboards, displays, printers, tablet computing devices, wearable electronic devices, smart phones, digital media players, content receivers, mobile computing devices, and so on.

FIG. 2A depicts a top down view of the actuator 102 of FIG. 1. The actuator 102 defines an actuation surface 216. Pivot portions 205, on which the actuator 102 pivots against (e.g., is pivotally engaged with) the housing 101 or plate, are disposed on a retaining ring 204 or retention lip.

In FIG. 2A, the retaining ring 204 is shown as forming a continuous perimeter around the edges of the actuator 102. However, it is understood that this is an example. In various implementations, the retaining ring 204 may be formed of separate sections that do not form a continuous perimeter around the edge of the actuator 102 without departing from the scope of the present disclosure.

Further, the pivot portions 205 are shown as particularly shaped portions of the retaining ring 204. For example, the pivot portions 205 are shown as having a sloped or curved edge. The sloped or curved edge of the pivot portions 205 may allow the actuator 102 to pivot easier than a sharp edge. However, it is understood that this is an example. In various implementations, variously shaped pivot portions 205 may be used without departing from the scope of the present disclosure.

FIG. 2B depicts a side view of the actuator 102 of FIG. 2A. Switch contact areas 207a, 207b and a ridge 210 are positioned on a switching surface 217 of the actuator 102 opposite the actuation surface 216.

In FIG. 2B, the pivot portion 205 is shown as an integral portion of the retaining ring 204. However, it is understood that this is an example. In various implementations, the pivot portion 205 may be a separate component coupled to and/or otherwise disposed on the retaining ring 204 without departing from the scope of the present disclosure.

Further, the rib 210 and the contact areas 207a, 207b are depicted as separate components coupled to the switching surface 217 of the actuator 102. However, it is understood that this is an example. In various implementations, the rib 210 and the contact areas 207a, 207b may be integrally formed components of the actuator 102 without departing from the scope of the present disclosure.

Additionally, in some implementations, the contact areas 207a, 207b may be flush with the switching surface 217 rather than components that protrude from the switching surface 217. For example, the contact areas 207a, 207b may be portions of the switching surface 217 of the actuator 102 that contact the dome switches 208a, 208b when the actuator 102 is pressed.

FIG. 2C depicts an underside view of the actuator 102 of FIG. 2A showing the switching surface 217. The rib 210 and the contact areas 207a, 207b are depicted as having particularly shaped configurations. However, it is understood that this is an example. The rib 210 and/or the contact areas 207a, 207b may be configured with various other shapes without departing from the scope of the present disclosure.

Additionally, the actuator 102 is depicted as having a generally rectangular shaped oval configuration. However, it is understood that this is an example. In various implementations, the actuator 102 may be configured to have various shapes without departing from the scope of the present disclosure. For example, in some implementations, the actuator 102 may have sharp corners rather than rounded as depicted in FIG. 2C.

FIG. 3A depicts a partial cross-sectional view of the electronic device 100 of FIG. 1, taken along line A-A of FIG. 1. The rocker input mechanism assembly 211 may include the actuator 102, the housing 101 or plate (having an internal or interior surface 213 and an opposite external or exterior surface 212) that defines the aperture 103 (extending from the internal surface 213 to the external surface 212) through which the actuator at least partially projects, and the dome switches 208a, 208b mounted on or coupled to a substrate 209 (such as a printed circuit board).

Although the top of the actuator 102 is illustrated as proud of the external surface 212, it is understood that this is an example for clarity. In various other embodiments, the top of the actuator 102 (i.e., the actuation surface 216) may be flush with and/or recessed into the external surface 212 without departing from the scope of the present disclosure.

The actuator 102 may define the actuation surface 216 and the switching surface 217 opposite the actuation surface 216. The actuation surface 216 may have a first actuation region 206a and a second actuation region 206b. The switching surface 217 may have switch contact areas 207a, 207b that correspond to the first and second actuation regions 206a, 206b. The switch contact areas 207a, 207b may respectively contact and engage the dome switches 208a, 208b to transfer force exerted on one of the first and second actuation regions 206a, 206b to a respective one of the dome switches 208a, 208b.

The switch contact areas 207a, 207b may respectively contact the dome switches 208a, 208b, absent force exerted on the actuator 102. The dome switches 208a, 208b may be partially compressed or deformed by that contact such that the dome switches 208a, 208b are biased toward uncompressing or undeforming. The bias of the partially compressed or deformed dome switches 208a, 208b may bias the pivot portion or pivot 205 toward the internal surface 213.

The actuator 102 may include a retaining ring 204 or retention lip disposed along an edge of the actuator 102 or integrally formed with the actuator 102. The retaining ring 204 may be separated from the internal surface 213 of the housing 101 by a gap 214 (which may change in dimension as the actuator 102 pivots). The pivot portion 205 (also encompassing an up-stop, a nub, a pivot, and a protrusion) may be positioned, disposed, or otherwise mounted or coupled on the retaining ring 204 in contact with the internal surface 213, allowing the actuator 102 to pivot against the internal surface 213.

The dimension of the gap 214 may determine how far the actuator 102 can pivot with respect to the internal surface 213 on the pivot portion 205. When force is exerted on one side of the actuator 102, actuator 102 pivots on the pivot portion 205 such that the gap 214 between the retaining ring 204 and the internal surface 213 increases and the gap 214 between the retaining ring 204 and the internal surface 213 on the other side decreases. When the retaining ring 204 contacts the internal surface 213 on the other side, eliminating the gap 214, pivoting of the actuator 102 may be stopped. Thus, the pivot portion 205 and the retaining ring 204 may define the motion of the actuator 102 and the gap 214 may constrain that motion.

The retaining ring 204 may have one or more dimensions larger than the aperture 103 such that the retaining ring 204 constrains motion of the actuator 102 with respect to the housing 101. For example, the retaining ring 204 may contact the housing 101 to prevent the actuator 102 from decoupled from the housing 101 and/or being removed through the aperture, may engage the internal surface 213 when force is exerted on the actuator 102 to constrain how far the actuator 102 can pivot, and so on.

In some implementations, the actuator 102 may also include a rib 210, ridge, or similar interference component that may prevent simultaneous actuation or activation of both of the dome switches 208a, 208b. The rib 210 may be positioned on the switch surface between the switch contact areas 207a, 207b (thus also between the dome switches 208a, 208b and the first and second actuation regions 206a, 206b. The rib 210 may engage a shim 215 or other component (such as the substrate 209) positioned on the substrate 209 when force is exerted on the actuator 102. This may prevent the unpressed side of the actuator 102 from contacting the dome switch 208a, 208b respectively underneath when force is exerted on the pressed side.

In various implementations, the rib 210 may be separated from the shim 215 absent exerted on the actuator 102. This may prevent the rib 210 and/or the shim 215 from unduly loading the actuator 102 and/or portions thereof against the internal surface 213 and/or housing 101.

In various implementations, the rib 210 may also engage the shim 215 when force is exerted on the actuator at a portion of the actuation surface 216 between the first and second actuation regions 206a, 206b. This may prevent force exerted on such a middle portion of the actuation surface 216 from activating either of the dome switches 208a, 208b. As a result, operation of the rocker input mechanism assembly 211 by a user may be restricted to when force is clearly exerted on the first and second actuation regions 206a, 206b.

However, it is understood that FIG. 3A is an example and that other configurations are possible without departing from the scope of the present disclosure. For example, in some implementations, the shim 215 and/or the rib 210 may be omitted or reverse which contacts a structure under the exertion of force.

FIG. 3B depicts the view of FIG. 2A when the second actuation region 206b of the rocker input mechanism assembly 211 is actuated. Force exerted on the second actuation region 206b may cause the actuator 102 to pivot or translate about the pivot portion 205. The side of the actuator 102 corresponding to the second actuation region 206b may lower (with respect to the view depicted in FIG. 2B) while the side of the actuator 102 corresponding to the first actuation region 206a may rise. This may cause the contact area 207b to transfer the force to the dome switch 208b, compressing or deforming and thereby activating or actuating the dome switch 208b.

This may also cause the contact area 207a to reduce force exerted on the dome switch 208a, allowing the dome switch 208a to uncompress or undeform to a degree. As a result, the contact area 207a may stay in contact with the dome switch 208a even when force is exerted on the second actuation region 206b rather than the first actuation region 206a.

Further, this may cause a first portion of the retaining ring 204 (corresponding to the first actuation region 206a) to move closer to the internal surface 213. At the same time, a second portion of the retaining ring 204 (corresponding to the second actuation region 206b) may move further from the internal surface 213.

Additionally, the rib 210 may move to contact the shim 215. This may stop or reduce motion of the actuator 102 toward the dome switch 208a. As such, the force exerted on the second actuation region 206b may be prevented from activating both of the dome switches 208a, 208b.

FIG. 3C depicts the view of FIG. 3A when the first actuation region 206a of the rocker input mechanism assembly 211 is actuated. Force exerted on the first actuation region 206a may cause the actuator 102 to pivot or translate on the pivot portion 205. The side of the actuator 102 corresponding to the first actuation region 206a may lower (with respect to the view depicted in FIG. 3C) while the side of the actuator 102 corresponding to the second actuation region 206b may rise. This may cause the contact area 207a to transfer the force to the dome switch 208a, compressing or deforming and thereby activating or actuating the dome switch 208a.

This may also cause the contact area 207b to reduce force exerted on the dome switch 208b, allowing the dome switch 208b to uncompress or undeform to a degree. As a result, the contact area 207b may stay in contact with the dome switch 208b even when force is exerted on the first actuation region 206a rather than the second actuation region 206b

Further, this may cause the second portion of the retaining ring 204 (corresponding to the second actuation region 206b) to move closer to the internal surface 213. At the same time, the first portion of the retaining ring 204 (corresponding to the first actuation region 206a) may move further from the internal surface 213.

Although FIGS. 3A-3C are illustrated and described as activating or not activating the dome switches 208a, 208b in a purely binary fashion (in other words, the dome switches 208a, 208b produce signals indicating whether or not force is exerted on the actuator 102), it is understood that this is an example. In some implementations, the dome switches 208a, 208b may be force sensing dome switches that are operable to produce signals indicating an amount of force out of a range of possible forces exerted on the actuator 102 rather than only indicating whether or not a force is exerted.

Further, although FIGS. 3A-3C are illustrated and described as utilizing dome switches 208a, 208b, it is understood that other activation mechanisms are possible and contemplated without departing from the scope of the present disclosure. In various implementations, various force sensors, contact pairs, capacitive plates that form a capacitor, optical transmitters and detectors, ultrasonic emitters and detectors, and/or other activation mechanisms may be used in place of the dome switches 208a, 208b. In implementations where the activation mechanisms themselves do not bias the actuator 102 toward the internal surface 213, other biasing mechanisms such as springs may be used to provide such biasing force.

Additionally, although the rocker input mechanism assembly 211 is illustrated and described above with respect to FIGS. 3A-3C as pivoting in two directions, it is understood that this is an example. In various implementations, such a rocker input mechanism assembly 211 may be configured to operate in modes other than a dual mode (such as a tri-mode rocker input mechanism assembly) without departing from the scope of the present disclosure. For example, in various implementations, a rocker input mechanism assembly 211 constructed according to the techniques described in the present disclosure may pivot in four directions rather than two.

FIG. 4 depicts a method 400 for constructing a rocker button. This method may construct the rocker input mechanism assembly 211 illustrated in FIGS. 1-3C.

At 410, an activator may be configured with one or more up-stops on an edge of the activator. The up-stop may be disposed on a lip or ring that forms a perimeter around the edge of the activator.

At 420, the activator may be positioned in a housing or plate aperture. Positioning the activator in the housing aperture may cause the up-stop to contact an interior surface of the housing around the aperture. In some implementations, the housing may be a panel formed of glass and/or other materials.

At 430, the activator may be biased toward the housing. This may bias the up-stop against the interior surface of the housing so that the activator is operable to pivot on the up-stop with respect to the interior surface.

For example, the activator may be biased toward the housing using dome switches or other activation assemblies. In such an example, the activator may be positioned at least partially (the portion that does not project through the aperture) between the housing and the dome switches.

Although the example method 400 is illustrated and described as including particular operations performed in a particular order, it is understood that this is an example. In various implementations, various orders of the same, similar, and/or different operations may be performed without departing from the scope of the present disclosure.

For example, in various implementations, the method may include the additional operation of configuring the activator with one or more components that are operable to constrain or restrict motion of the activator. Such a component may include a retention ring or lip, a rib, and/or other such components.

As described above and illustrated in the accompanying figures, the present disclosure relates to a rocker input mechanism. An actuator is positioned in an aperture defined in a housing and is biased toward the housing by dome switches or other activation assemblies underneath the actuator. Pivots coupled to edges of the actuator contact an internal surface of the housing such that the actuator is operable to pivot with respect to the housing. Force exerted on actuation regions on the top surface of the actuator causes the actuator to pivot and activate one of the dome switches. Due to the configuration of the pivot and the biasing, the actuator does not bend or flex when force is exerted like typical rocker buttons. This may allow the rocker input mechanism to have a feel to a user like non-rocking input mechanisms. In various implementations, a rib or similar component may be positioned underneath the actuator in between where the actuator contacts the dome switches. The rib may be operable to engage a shim or other portion of a substrate over which the actuator is positioned when force is exerted on the actuator. This may prevent the unpressed side of the actuator from contacting the dome switch underneath when force is exerted on the pressed side. As a result, presses on one side of the actuator may be prevented from activating dome switches for both sides.

In the present disclosure, the methods disclosed may be implemented as sets of instructions or software readable or executable by a device. Further, it is understood that the specific order or hierarchy of steps in the methods disclosed are examples of sample approaches. In other embodiments, the specific order or hierarchy of steps in the method can be rearranged while remaining within the disclosed subject matter. The accompanying method claims present elements of the various steps in a sample order, and are not necessarily meant to be limited to the specific order or hierarchy presented.

The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.

Claims

1. An electronic device, comprising: a housing, comprising: an external surface; andan internal surface opposite to the external surface; whereinthe housing defines an aperture extending from the external surface to the internal surface; anda rocker input mechanism, comprising: a button positioned in the aperture, comprising: an actuation surface defining first and second actuation regions;a switching surface opposite the actuation surface;a retention lip that has a dimension larger than the aperture and engages the internal surface; anda pivot portion disposed on the retention lip between the first and the second actuation regions that pivots against the internal surface.

2. The electronic device of claim 1, wherein the pivot portion is biased toward the housing.

3. The electronic device of claim 2, wherein the pivot portion is biased toward the housing by a dome switch.

4. The electronic device of claim 1, wherein the actuation surface is at least one of flush with the external surface or recessed into the exterior surface.

5. The electronic device of claim 1, wherein the pivot portion has a sloped edge.

6. The electronic device of claim 1, wherein the switching surface includes first and second contact areas that respectively correspond to the first and second actuation regions.

7. The electronic device of claim 6, wherein the first and second contact areas respectively engage first and second switches.

8. An input mechanism assembly, comprising: a pair of switches;a plate defining an aperture; andan actuator that: is partially positioned in the aperture;pivots against the plate; andis biased toward the plate by the pair of switches.

9. The input mechanism assembly of claim 8, wherein the actuator includes a ring that is separated from the plate by a gap.

10. The input mechanism assembly of claim 9, wherein the actuator pivots against the plate by an up-stop positioned on the ring.

11. The input mechanism assembly of claim 9, wherein the ring is operable to constrain motion of the actuator with respect to the plate.

12. The input mechanism assembly of claim 9, wherein a first portion of the ring moves closer to the plate and a second portion of the ring moves farther from the plate when the actuator actuates one of the pair of switches.

13. The input mechanism assembly of claim 9, wherein the ring contacts the plate to prevent decoupling of the actuator from the plate.

14. The input mechanism assembly of claim 8, wherein the pair of switches produces signals indicating an amount of force exerted on the actuator.

15. An electronic device, comprising: a substrate;a housing;an activator positioned between the substrate and the housing and projecting through the housing; anda rib coupled to the activator that prevents simultaneous activation by the activator of first and second dome switches coupled to the substrate; wherein:the activator is pivotally engaged with the housing; anda portion of the activator moves transverse to the housing to activate the first and second dome switches.

16. The electronic device of claim 15, further comprising: a shim coupled to the substrate, wherein:the rib engages the shim to prevent simultaneous activation of the first and second dome switches by the activator.

17. The electronic device of claim 16, wherein the rib is separated from the shim absent force exerted on the activator.

18. The electronic device of claim 16, wherein the shim is positioned between the first and second dome switches.

19. The electronic device of claim 15, wherein the activator is in contact with the first dome switch when activating the second dome switch.

20. The electronic device of claim 15, wherein the activator contacts the first and second dome switches absent force exerted on the activator.