Head-mounted device with tension adjustment

1. A head-mounted device, comprising:

a device housing;

a support structure that is connected to the device housing to support the device housing with respect to a user;

a display device that is connected to the device housing to display content;

an optical system that is associated with the display device;

sensors that generate sensor output signals;

a tension controller that is configured to:

predict a future acceleration of a head of the user based on the sensor output signals; and

determine a tensioning command based on the predicted future acceleration of the head of the user; and

a tension adjuster that applies tension to the user according to the tensioning command in order to restrain motion of the device housing with respect to the user, wherein the tension adjuster includes a nose pad that is configured to move relative to the device housing to engage a nose of the user and an actuator that is connected to the nose pad to apply tension by movement of the nose pad.

2. The head-mounted device of claim 1 , wherein the support structure includes temple portions that are pivotable with respect to the device housing and the tension adjuster includes an active tensioning component that is configured to cause pivoting of the temple portions with respect to the device housing in accordance with the tensioning command.

3. The head-mounted device of claim 2 , wherein the active tensioning component includes an electric motor.

4. The head-mounted device of claim 1 , wherein the tension adjuster includes a passive tensioning component.

5. The head-mounted device of claim 1 , wherein the tension adjuster includes deployable contact features that are movable between a retracted position and an extended position.

6. The head-mounted device of claim 1 , wherein the support structure includes a temple portion and the tension adjuster includes a hook portion located at an end of the temple portion, wherein the hook portion is configured to engage an ear of a user and is connected to the support structure by a motorized hinge, and the tension adjuster is configured to apply tension by causing rotational movement of the hook portion relative to the temple portion using the motorized hinge.

7. The head-mounted device of claim 1 , wherein the tension adjuster includes an actuator and a mass, and the tension adjuster is configured to apply tension by moving the mass using the actuator.

8. The head-mounted device of claim 1 , wherein the support structure includes temple portions and the tension adjuster is configured to apply tension along a length of the temple portions to cause the temple portions to move between normal positions and curved positions.

9. A head-mounted device, comprising:

a device housing;

a support structure that is connected to the device housing to support the device housing with respect to a user;

a display device that is connected to the device housing to display content;

an optical system that is associated with the display device;

sensors that generate sensor output signals;

a tension controller that is configured to:

determine a user behavior profile using the sensor output signals, wherein the user behavior profile includes information that describes observed states over an extended time period,

determine a motion prediction based on the sensor output signals and the user behavior profile, and

determine a tensioning command based on the motion prediction; and

a tension adjuster that applies tension to the user according to the tensioning command in order to restrain motion of the device housing with respect to the user.

10. The head-mounted device of claim 9 , wherein the sensors include a motion sensor, the sensor output signals include a motion signal, and the tension controller is configured to determine the tensioning command based in part on the motion signal.

11. The head-mounted device of claim 9 , wherein the sensors include an eye tracking camera, the sensor output signals include an eye tracking signal, and the tension controller is configured to determine the tensioning command based in part on the eye tracking signal.

12. The head-mounted device of claim 9 , wherein the sensors include a biometric sensor, the sensor output signals include a biometric signal, and the tension controller is configured to determine the tensioning command based in part on the biometric signal.

13. The head-mounted device of claim 9 , wherein the sensors include a pressure sensor, the sensor output signals include a pressure signal, and the tension controller is configured to determine the tensioning command based in part on the pressure signal.

14. The head-mounted device of claim 13 , wherein the pressure sensor includes a nose pad that is in engagement with a nose of the user.

15. A method for controlling tension applied by a tension adjuster of a head-mounted device, comprising:

obtaining sensor output signals from sensors;

determining a user behavior profile using the sensor output signals, wherein the user behavior profile includes information that describes observed states over an extended time period;

determining a motion prediction based on the sensor output signals and the user behavior profile;

determining a tensioning command based on the motion prediction; and

applying tension using the tension adjuster according to the tensioning command.

16. The method of claim 15 , wherein the tension adjuster includes pivotable portions that are pivoted in accordance with the tensioning command.

17. The method of claim 15 , wherein the tension adjuster includes a contact pad and an actuator that is connected to the contact pad to apply tension by movement of the contact pad.

18. The method of claim 15 , wherein the tension adjuster includes deployable contact features that are movable between a retracted position and an extended position in accordance with the tensioning command.

19. The method of claim 15 , wherein the tension adjuster includes a hook portion that is configured to engage an ear of a user, and the tension adjuster includes a motorized hinge that is configured to move the hook portion in accordance with the tensioning command.

20. The method of claim 15 , wherein the tension adjuster includes an actuator and a mass, and the tension adjuster is configured to apply tension in accordance with the tensioning command by moving the mass using the actuator.

21. The method of claim 15 , wherein the tension adjuster includes temple portions and the tension adjuster is configured to apply tension by causing temple portions to move between normal positions and curved positions.

22. A head-mounted device, comprising:

a device housing;

a support structure that is connected to the device housing to support the device housing with respect to a user;

a display device that is connected to the device housing to display content;

an optical system that is associated with the display device;

sensors that generate sensor output signals;

a tension controller that is configured to:

predict a future acceleration of a head of the user based on the sensor output signals; and

determine a tensioning command based on the predicted future acceleration of the head of the user; and

a tension adjuster that applies tension to the user according to the tensioning command in order to restrain motion of the device housing with respect to the user;

wherein the support structure includes temple portions and the tension adjuster is configured to apply tension along a length of the temple portions to cause the temple portions to move between normal positions and curved positions.