Small form-factor keypad for mobile computing devices
View Patent ↗Embodiments of the invention provide an effective keypad assembly and keypad layout for mobile computing devices. In particular, embodiments of the invention provide keyboard layouts and designs. Additionally, embodiments described herein provide for stack components to make keyboards operable on small-form factor devices.
1. A mobile computing device comprising:
a plurality of electrical contacts;
a plurality of key structures that are each moveable inward, from an original position into an engaged position, in order to cause an actuation member extending from each of the plurality of key structures to contact a corresponding electrical contact of the plurality of electrical contacts,
wherein each of the plurality of electrical contacts comprises an interior contact, an outer contact surface curved outward over the interior contact, and a sheath layer affixed over the outer contact surface, the sheath layer being semi-rigid, and the outer contact surface combined with the sheath layer are collapsible together when pressed by the actuation member that is aligned with that electrical contact.
2. The mobile computing device of claim 1 , wherein the length of individual key structures of at least a majority of the plurality of key structure are aligned with a vertical axis of the mobile computing device.
3. The mobile computing device of claim 1 , wherein key structures in the plurality of key structures that are adjacent to one another in a first direction nearly abut one another.
4. The mobile computing device of claim 3 , wherein key structures in the plurality of key structures that are most proximate to one another in a second direction that is orthogonal to the first direction are not nearly abutting.
5. The mobile computing device of claim 4 , wherein the first spacing is sufficiently small to preclude a user from seeing into the first spacing to view what is underlying the first spacing, and wherein the second spacing is sufficiently large to enable the user to view what is underlying the second spacing.
6. The mobile computing device of claim 1 , wherein key structures in the plurality of key structures that are adjacent to one another in the first direction are distributed linearly in the first direction.
7. The mobile computing device of claim 1 , wherein key structures in the plurality of key structures that are adjacent to one another in the first direction are distributed in a curve extending substantially in the first direction.
8. The mobile computing device of claim 1 , wherein the plurality of key structures include ornamentation for a keyboard, and wherein the plurality of key structures are arranged to form a QWERTY layout.
9. The mobile computing device of claim 1 , wherein a footprint of each of the majority of the key structures is rectangular, and wherein the outward curvature of each of the majority of key structures is symmetrical about an approximate centerline of that key structure.
10. The mobile computing device of claim 1 , wherein the plurality of key structures include one or more boundary key structures that are asymmetrical about the vertical axis.
11. The mobile computing device of claim 1 , wherein at least some of the plurality of key structures, including the majority of the plurality of key structures, are each structured to include a first lateral edge and a second lateral edge that each extend into the housing, and wherein a first groove joins the first lateral edge with the outward curvature of the outer surface, and wherein a second groove joins the second lateral edge with the outward curvature of the outer surface.
12. The mobile computing device of claim 11 , wherein the first groove and the second groove are shaped as a scallop.
13. The mobile computing device of claim 1 , wherein the sheath layer is formed from MYLAR.
14. The mobile computing device of claim 1 , wherein the sheath layer covers the entirety of the outer contact surface.
15. The mobile computing device of claim 1 , wherein the sheath layer has an opening to receive the particular actuation member so that the particular actuation member makes direct contact with the outer contact surface.
16. A keyboard for a mobile computing device comprising:
a plurality of key structures, each key structure being moveable inward from an original position into an engaged position in order to cause an input to be registered by one or more processors of the mobile computing device; and
an electrical contact layer comprising a plurality of electrical contacts,
wherein the one or more electrical contacts each include a sheath layer affixed over an outer contact surface, the sheath layer being semi-rigid, and the sheath layer combined with the outer contact surface are collapsible together when pressed by an actuation member that is positioned to extend inward when a corresponding key structure is pressed.
17. The keyboard for a mobile computing device of claim 16 , wherein the sheath layer is formed from MYLAR.
18. The keyboard for a mobile computing device of claim 16 , wherein the sheath layer covers the entirety of the outer contact surface.
19. The keyboard for a mobile computing device of claim 16 , wherein the sheath layer has an opening to receive the actuation member so that the actuation member makes direct contact with the outer contact surface.