Tactile switch for an electronic device
An electronic watch may include a tactile switch and/or one or more sensors for detecting rotational and translational inputs. The watch may include a display configured to produce graphical outputs that may change in response to rotational inputs, translational inputs, and/or touch inputs received at the display. The watch include a crown positioned along an exterior of the watch enclosure and a shaft coupled to the crown and extending into the enclosure. The tactile switch and/or the one or more sensors may be used to detect rotational and/or translational inputs provided at the crown.
1. An electronic watch, comprising:
a watch enclosure comprising a first electrically conductive portion and defining:
an interior volume; and
an opening extending to the interior volume;
a crown comprising a second electrically conductive portion;
a shaft coupled to the crown and extending through the opening and into the interior volume;
a tactile switch positioned within the interior volume and coupled to the shaft; and
a processor within the interior volume and electrically coupled to the crown by the tactile switch and the shaft, the processor electrically coupled to the first electrically conductive portion of the watch enclosure, wherein:
the first electrically conductive portion is configured to contact a first body part;
the second electrically conductive portion is configured to contact a second body part;
the first and second electrically conductive portions are used to detect at least one voltage; and
the processor is configured to determine an electrocardiogram at least partly from the at least one voltage.
2. The electronic watch of claim 1 , wherein:
the tactile switch is configured to collapse from a default state to a collapsed state in response to a translation of the shaft from an undepressed position to a depressed position; and
the tactile switch electrically couples the processor to the crown in the default state and the collapsed state.
3. The electronic watch of claim 1 , wherein the second electrically conductive portion and the shaft are electrically isolated from the watch enclosure.
4. The electronic watch of claim 1 , wherein:
the at least one voltage comprises:
a first voltage detected at the first electrically conductive portion; and
a second voltage detected at the second electrically conductive portion; and
the processor is configured to determine the electrocardiogram by comparing the first voltage with the second voltage.
5. The electronic watch of claim 1 , wherein:
the electronic watch further comprises a touch-sensitive display; and
the processor is further configured to modify a graphical output of the touch-sensitive display in response to determining the electrocardiogram.
6. The electronic watch of claim 1 , further comprising a rotation sensor configured to detect a rotational input at the crown by detecting rotation of the shaft.
7. The electronic watch of claim 6 , wherein:
the tactile switch is configured to detect a translational input at the crown by detecting translation of the shaft;
the electronic watch further comprises a touch-sensitive display; and
the processor is further configured to modify a graphical output of the touch-sensitive display in response to at least one of the rotational input or the translational input.
8. An electronic watch, comprising:
a watch enclosure having a first portion that is configured as a first electrode;
a touch-sensitive display positioned at least partially within the watch enclosure and configured to:
receive a touch input; and
display a graphical output;
a crown positioned along a side of the watch enclosure, configured to receive a rotational input and a translational input, and having a second portion that is configured as a second electrode;
a processor positioned within the watch enclosure and electrically coupled to the first and second electrodes; and
a translation sensor configured to:
detect the translational input; and
electrically couple the second electrode to the processor, wherein:
the processor is configured to:
determine an electrocardiogram measurement using the first and second electrodes; and
modify the graphical output of the touch-sensitive display in response to determining the electrocardiogram measurement.
9. The electronic watch of claim 8 , wherein:
the electronic watch further comprises a conductive shaft that extends into an interior volume of the watch enclosure and defines a conductive path between the second electrode and the translation sensor; and
the conductive shaft and the translation sensor electrically couple the second electrode to the processor.
10. The electronic watch of claim 9 , wherein the second electrode and the conductive shaft are electrically isolated from the watch enclosure.
11. The electronic watch of claim 9 , wherein the translation sensor is a tactile switch positioned at an end of the conductive shaft.
12. The electronic watch of claim 11 , wherein the tactile switch comprises a collapsible dome configured to collapse in response to translation of the conductive shaft.
13. The electronic watch of claim 8 , wherein:
the first electrode is configured to contact a wrist of a user; and
the second electrode is configured to contact a finger of the user.
14. The electronic watch of claim 8 , wherein the processor is further configured to modify the graphical output of the touch-sensitive display based on each of the rotational input and the translational input.
15. An electronic watch, comprising:
an enclosure comprising a conductive material and configured to contact a wrist of a user;
a crown positioned along a side of the enclosure, electrically isolated from the enclosure, and configured to be touched by a finger of the user;
a shaft coupled to the crown, extending through an opening in the enclosure, and electrically isolated from the enclosure;
a processor electrically coupled to the crown by the shaft, and further electrically coupled to the enclosure; and
a display carried by the enclosure and configured to display graphical objects, wherein the processor is configured to:
determine, based on an electrical signal received from a body of the user by at least one of the enclosure or the crown, an electrocardiograph (ECG) of the user; and
in response to determining the ECG of the user, cause a graphical object related to the ECG to be displayed on the display.
16. The electronic watch of claim 15 , wherein:
the electronic watch further comprises a translation sensor configured to detect a translational input from the crown; and
the processor is electrically coupled to the crown by the shaft and the translation sensor.
17. The electronic watch of claim 16 , wherein the electronic watch further comprises a rotation sensor configured to detect a rotational input from the crown.
18. The electronic watch of claim 17 , wherein the processor is further configured to modify the graphical object in response to each of the rotational input and the translational input.
19. The electronic watch of claim 15 , wherein:
the display is a touch-sensitive display configured to receive a touch input; and
the processor is further configured to modify the graphical object in response to the touch input.
20. The electronic watch of claim 15 , wherein:
the processor is further configured to:
cause one of the enclosure or the crown to apply a voltage at the wrist or the finger; and
cause the other of the enclosure or the crown to receive the electrical signal from the body of the user; and
the processor determines the ECG of the user by comparing one or more characteristics of the electrical signal with one or more characteristics of the applied voltage.