Switch assembly and methods of use
Various implementations include a switch assembly that includes a housing and at least two printed circuit boards (PCBs) that are disposed within the housing and are axially arranged relative to each other. One or more force sensors are disposed on one of the PCBs, and, in some implementations, the one or more force sensors receive force input received by a touch overlay plate. Signals from the force sensors are processed to determine a magnitude, acceleration, and/or location of the force input, and a haptic feedback response is received by the touch overlay plate. The haptic feedback response is based on the force magnitude, acceleration, and/or location of input, according to some implementations. Axially arranging the PCBs reduces the footprint of the switch assembly and allows for the inclusion of more electrical components in the switch assembly, according to some implementations.
1. A switch assembly comprising:
a housing having one or more walls that define a chamber;
a printed circuit board (PCB) disposed within the chamber, the PCB having a first surface that faces in a first axial direction and a second surface that faces in a second axial direction, the second axial direction being opposite from the first axial direction, the PCB comprising a force sensor disposed on the second surface;
a frame coupled to at least one of the one or more walls of the housing;
a light guide disposed axially between the frame and the second surface of the PCB; and
a spring disposed adjacent the light guide, the spring urging the light guide in the first axial direction toward the PCB to pre-load the force sensor.
2. The switch assembly of claim 1 , wherein the spring pre-loads the force sensor to between 1 and 5 N.
3. The switch assembly of claim 2 , wherein the spring pre-loads the force sensor to 2.8 N.
4. The switch assembly of claim 1 , wherein the spring is a coil spring having a first end and a second end.
5. The switch assembly of claim 4 , wherein the light guide comprises a first surface that faces in the first axial direction and a second surface that faces in the second axial direction, the second surface of the light guide defining an axial depression, wherein the first end of the coil spring is disposed within the axial depression.
6. The switch assembly of claim 5 , wherein the frame comprises an axial depression which is axially aligned with the axial depression of the light guide, wherein the second end of the coil spring is disposed within the axial depression of the frame.
7. The switch assembly of claim 1 , wherein the light guide comprises a first surface that faces in the first axial direction and a second surface that faces in the second axial direction, wherein light guide comprises a post extending in the second axial direction from the second surface of the light guide.
8. The switch assembly of claim 7 , wherein the spring is a leaf spring having a central portion and a leg portion, the leg portion extending from the central portion.
9. The switch assembly of claim 8 , wherein the leg portion engages the post to urge the light guide in the first axial direction toward the PCB to pre-load the force sensor.
10. The switch assembly of claim 9 , wherein the central portion is coupled to the frame.
11. The switch assembly of claim 9 , wherein the central portion is overmolded with a portion of the frame.
12. The switch assembly of claim 9 , wherein the post is formed separately from the light guide and coupled to the light guide.
13. The switch assembly of claim 9 , wherein the post if formed integrally with the light guide.
14. The switch assembly of claim 1 , wherein the spring is a leaf spring having a central portion and a leg portion, the leg portion extending from the central portion and comprising an arcuate portion having an apex.
15. The switch assembly of claim 14 , wherein the apex lies within a plane that is spaced apart from a plane that includes the central portion.
16. The switch assembly of claim 15 , wherein the light guide comprises a first surface that faces in the first axial direction and a second surface that faces in the second axial direction, wherein the apex abuts the second surface of the light guide to urge the light guide in the first axial direction toward the PCB to pre-load the force sensor.
17. The switch assembly of claim 14 , wherein the central portion is coupled to the frame.
18. The switch assembly of claim 17 , wherein the frame comprises a tab having a shoulder, the tab extending from a surface of the frame, wherein the central portion is disposed axially between the shoulder and the surface of the frame.
19. The switch assembly of claim 17 , wherein the frame comprises a protrusion and the central portion defines an opening, wherein the protrusion extends through the opening.
20. The switch assembly of claim 14 , wherein the central portion is overmolded with a portion of the frame.