Low-profile spring-loaded contacts
Contact structures that are readily manufactured, where contacts in the contact structures provide a sufficient normal force while consuming a minimal amount of surface area, depth, and volume in an electronic device.
1. A keyboard comprising:
a device enclosure having an opening;
a board in the device enclosure;
a contact structure in the device enclosure and comprising:
a housing having a top surface; and
a plurality of spring-biased contacts, each partially located in the housing and comprising a contacting portion depressible in a contacting direction, the contacting direction orthogonal to the board, and a tail portion, the tail portion attached to the board and electrically connected to traces on the board, the housing molded around a portion of at least one of the plurality of spring-biased contacts; and
a cover having a plurality of openings, where for each opening, a contacting portion of a corresponding contact extends through the opening, the cover formed separately from the housing and including an element extending from a bottom of the cover to align the cover to the top surface of the housing,
wherein the cover includes a raised portion arranged to fit in the opening of the device enclosure, the raised portion around the openings in the cover, and
wherein the plurality of spring-biased contacts are arranged in a line.
2. The keyboard of claim 1 wherein the plurality of spring-biased contacts are coupled to interconnect in the keyboard.
3. The keyboard of claim 2 wherein the tail portions of the plurality of spring-biased contacts emerge from a bottom of the housing and are coupled to interconnect in the keyboard.
4. The keyboard of claim 3 wherein each of the plurality of spring-biased contacts are biased by a corresponding one of a plurality of springs.
5. The keyboard of claim 3 wherein each of the plurality of spring-biased contacts comprises a flexible lever arm.
6. The keyboard of claim 3 wherein each of the plurality of spring-biased contacts comprises the contacting portion attached to a first end of a flexible lever arm.
7. The keyboard of claim 6 wherein a barb is formed on a second end of the flexible lever arm for one of the plurality of spring-biased contacts, the barb inserted into the housing.
8. A contact structure comprising:
a housing having plurality of slots extending parallel with each other;
a plurality of contacts each comprising:
a contact portion in a corresponding one of the plurality of slots, where a portion of the housing is molded around a portion of the contact portion;
a flexible arm at a first end of the contact portion; and
a contacting portion attached to the flexible arm, wherein the flexible arm angles up away from a bottom plate of the contact structure such that the contacting portion may be depressed towards the bottom plate of the contact structure;
the bottom plate under the housing and having a plurality of tabs; and
a top plate over the housing and comprising a plurality of openings, where for each opening, the contacting portion of a corresponding contact extends through the opening, the top plate further comprising a plurality of notches to accept the tabs on the bottom plate, such that the top plate, housing, and bottom plate are attached,
wherein the top plate comprises a raised portion, the raised portion around the openings in the top plate, where the contacting portions of the contacts protrude out of the raised portion.
9. The contact structure of claim 8 wherein the housing further comprises a plurality of notches to accept the tabs on the bottom plate.
10. The contact structure of claim 9 wherein the raised portion is arranged to fit in an opening of an electronic device.
11. A contact structure comprising:
a housing having a top surface;
a plurality of spring-biased contacts, each partially located in the housing and comprising a contacting portion depressible in a contacting direction, the contacting direction orthogonal to a board, and a tail portion, the tail portion attached to the board and electrically connected to traces on the board, the housing molded around a portion of at least one of the plurality of spring-biased contacts; and
a cover having a plurality of openings, where for each opening, a contacting portion of a corresponding contact extends through the opening, the cover formed separately from the housing and,
wherein the cover includes a raised portion arranged to fit in an opening of a device enclosure, the raised portion around the openings in the cover, and
wherein the plurality of spring-biased contacts are arranged in a line.
12. The contact structure of claim 11 wherein the cover includes an element extending from a bottom of the cover to align the cover to the top surface of the housing.
13. The contact structure of claim 11 wherein each of the plurality of spring-biased contacts comprises a spring.
14. The contact structure of claim 11 wherein the contacting portions of the plurality of spring-biased contacts protrude out of the raised portion.
15. The contact structure of claim 11 wherein each of the plurality of spring-biased contacts comprises a contacting portion attached to a first end of a flexible lever arm.
16. The contact structure of claim 15 wherein a barb is formed on a second end of the flexible lever arm for one of the plurality of spring-biased contacts, the barb inserted into the housing.