Fluidic switching device with viscoelastic material

1. A fluidic switch comprising:

a housing defining a cavity with a first opening and a second opening, the second opening being larger than the first opening, the cavity containing a viscoelastic substance;

a channel to transport a fluid from a source, across the first opening, to a drain, wherein the first opening opens into the channel; and

an actuator to apply a force through the second opening to the viscoelastic substance in the cavity when actuated, the force to displace a portion of the viscoelastic substance into the channel to impede transport of the fluid through the channel.

2. The fluidic switch of claim 1 , wherein the portion of the viscoelastic substance is to retract from the channel back into the cavity when the actuator ceases to apply the force.

3. The fluidic switch of claim 1 , wherein:

the actuator is electrically connected to a controller to receive electrical signals from the controller; and

the actuator is to apply and remove the force in response to the electrical signals.

4. The fluidic switch of claim 3 , wherein the actuator is piezoelectric.

5. The fluidic switch of claim 3 , wherein the electrical signals correspond to data displayed by a head-mounted display.

6. The fluidic switch of claim 1 , wherein a cross-sectional area of the cavity decreases from the second opening to the first opening.

7. The fluidic switch of claim 6 , wherein the cavity is substantially frustoconical.

8. The fluidic switch of claim 1 , further comprising a gasket, disposed between the actuator and the viscoelastic substance, to seal the second opening of the cavity.

9. The fluidic switch of claim 8 , wherein the gasket is an O-ring.

10. The fluidic switch of claim 1 , wherein the viscoelastic substance is a viscoelastic polymer.

11. The fluidic switch of claim 1 , wherein:

the first opening is situated on a first side of the housing; and

at least a portion of the channel is situated on the first side of the housing.

12. The fluidic switch of claim 1 , wherein the actuator is disposed in the second opening.

13. A method of switching a fluidic switch, comprising:

providing a fluidic switch that comprises:

a housing defining a cavity with a first opening and a second opening, the second opening being larger than the first opening, the cavity containing a viscoelastic sub stance;

a channel that transports a fluid across the first opening, wherein the first opening opens into the channel; and

an actuator;

causing the fluid to flow through the channel; and

while the fluid is flowing, applying, via the actuator, a force to the viscoelastic substance in the cavity, wherein the force displaces a portion of the viscoelastic substance into the channel,

wherein the portion of the viscoelastic substance displaced into the channel impedes the flow of the fluid in the channel.

14. The method of claim 13 , further comprising ceasing to apply the force to the viscoelastic substance by the actuator,

wherein the portion of the viscoelastic substance displaced into the channel retracts back into the cavity when the actuator ceases to apply the force.

15. The method of claim 13 , wherein:

the actuator is electrically connected to a controller;

the method further comprises receiving an electrical signal from the controller; and

applying the force to the viscoelastic substance is performed in response to receiving the electrical signal.

16. The method of claim 15 , wherein the electrical signal corresponds to data displayed by a head-mounted display.

17. The method of claim 13 , wherein a cross-sectional area of the cavity decreases from the second opening to the first opening.

18. The method of claim 17 , wherein the cavity is substantially frustoconical.

19. The method of claim 13 , wherein the actuator is piezoelectric.

20. The method of claim 13 , wherein the viscoelastic substance is a viscoelastic polymer.