Dome switch and switch housing for keyboard assembly

Patent metadata

Field	Value
Publication number	US-9870880-B2
Application number	US-201514867598-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Sep 30, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A dome switch utilized in a keyboard assembly is disclosed. The keyboard assembly may include a printed circuit board having a first electrical connector formed in the printed circuit board, and a second electrical connector formed in the printed circuit board adjacent the first electrical connector. The keyboard assembly may also include an inner contact component contacting the second electrical connector of the printed circuit board. The inner contact component may be in electrical communication with the second electrical connector of the printed circuit board. Additionally, the keyboard assembly can include a dome switch surrounding the inner contact component. The dome switch may contact and may be in electrical communication with the first electrical connector of the printed circuit board.

First claim

What is claimed is:

1. A keyboard assembly comprising:
a printed circuit board comprising:
a first electrical connector; and
a second electrical connector adjacent the first electrical connector;

an inner contact component contacting and in electrical communication with the second electrical connector; and
a dome switch surrounding the inner contact component, the dome switch contacting and in electrical communication with the first electrical connector, wherein:
the printed circuit board defines an opening beneath the inner contact component; and
the dome switch and the inner contact component are configured to contact one another in response to a depression of a keycap, thereby triggering a switch event; and
the inner contact component is configured to displace at least partially into the opening and remain spaced apart from the printed circuit board within the opening in response to the depression of the keycap.

2. The keyboard assembly of claim 1 , wherein the inner contact component comprises a strip formed from a substantially flexible, conductive material.

3. The keyboard assembly of claim 2 , wherein the dome switch and the strip are operative to cooperatively generate an electrical signal.

4. The keyboard assembly of claim 2 , wherein:
the dome switch contacts the strip when the dome switch is partially collapsed; and
the strip is undeformed when the dome switch is partially collapsed.

5. The keyboard assembly of claim 1 , wherein:
the inner contact component comprises a conductive plug positioned in the opening; and the conductive plug is in electrical communication with the second electrical connector.

6. The keyboard assembly of claim 5 , wherein the dome switch contacts a contact surface of the conductive plug.

7. A keyboard assembly, comprising:
a dome switch comprising:
a domed structure defining:
a top portion positioned adjacent a keycap of the keyboard assembly;
a bottom portion extending from the top portion; and
an end extending from the bottom portion; and

a set of contact protrusions extending angularly from the top portion and toward the printed circuit board; and

a printed circuit board positioned beneath the dome switch and supporting the dome switch, the printed circuit board comprising a first electrode and a second electrode separated along a top surface; wherein the end:
passes at least partially through at least one of the printed circuit board and a switch housing coupled to the printed circuit board; and
is electrically grounded within at least one of the printed circuit board or the switch housing.

8. The keyboard assembly of claim 7 , wherein the domed structure is operative to collapse at least partially through an aperture formed in the printed circuit board.

9. The keyboard assembly of claim 8 , wherein:
the printed circuit board comprises:
a first surface positioned adjacent the bottom portion of the dome switch; and
a second surface positioned opposite the first surface; wherein
the end of the dome switch extends completely through the printed circuit board and onto the second surface of the printed circuit board.

10. The keyboard assembly of claim 9 , wherein the end is positioned partially through the printed circuit board and is grounded within the printed circuit board.

11. A keyboard assembly, comprising:
a printed circuit board;
a switch housing positioned on the printed circuit board, the switch housing defining a switch opening; and
a dome switch positioned within the switch opening of the switch housing, the dome switch comprising:
a domed body; and
one or more contact protrusions fixed to the domed body at a first end and having a second free end, opposite the first end, extending angularly from the domed body and configured to deform in response to contact with the printed circuit board.

12. The keyboard assembly of claim 11 , further comprising a keycap positioned above the switch housing, and collapsing the dome switch to form an electrical connection.

13. The keyboard assembly of claim 11 , further comprising:
a first electrical connector in the printed circuit board, and in contact with a bottom portion of the dome switch;
a second electrical connector in the printed circuit board and substantially aligned with the one or more contact protrusions of the dome switch; and
an aperture formed in the printed circuit board adjacent the second electrical connector, the opening aligned with the switch opening of the switch housing.

14. The keyboard assembly of claim 13 , wherein the one or more contact protrusions of the dome switch contact the second electrical connector.

15. The keyboard assembly of claim 13 , wherein the one or more contact protrusions of the dome switch are positioned above the second electrical connector formed in the printed circuit board when the dome switch is uncollapsed.

16. The keyboard assembly of claim 15 , wherein the one or more contact protrusions of the dome switch contact the second electrical connector at a first position when the dome switch is partially collapsed.

17. The keyboard assembly of claim 16 , wherein the one or more contact protrusions of the dome switch contact the second electrical connector at a second position when the dome switch is fully collapsed.

18. The keyboard assembly of claim 17 , wherein the one or more contact protrusions of the dome switch collapse in order to contact the second electrical connector at the second position.

19. The keyboard assembly of claim 17 , wherein a portion of the dome switch is positioned within the aperture formed in the printed circuit board when the dome switch is fully collapsed.

Assignees

• Apple Inc

Inventors

• Zercoe Bradford J
• Leong Craig C
• Niu James J
• Brock John M
• Hendren Keith J

Classifications

• H01H2203/038

  to be bridged by a dome shaped contact · CPC title

• H01H2203/004

  Rivet · CPC title

• H01H13/803

  characterised by the switching function thereof, e.g. normally closed contacts or consecutive operation of contacts · CPC title

• H01H13/023

  Light-emitting indicators (for multi-layer switches H01H13/83) · CPC title

• H01H2205/024

  Means to facilitate positioning · CPC title