Thermal regulation of balloon payload using electronic ink

• US 8,804,228 B1
• Filed: 12/28/2012
• Issued: 08/12/2014
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: Loon, LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Biffle, Clifford, DeVaul, Richard Wayne, Weaver, Joshua, Teller, Eric, Rhodes, Bradley James
• Primary Examiner(s): HASAN, MOHAMMED A
• Application Number:
  US13/730,222
• Time in Patent Office: 592 Days
• Field of Search: 359/296, 345/107, 345/105, 345/49, 430/32, 430/34, 430/38
• US Class Current: 359/296
• CPC Class Codes: B64B 1/62 Controlling gas pressure, heating, cooling, or discharging gas
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/16757 Microcapsules

Abstract

A balloon payload is provided having a payload structure, an outer surface of the payload structure comprised of an electronic ink covering, and a control system configured to change the electronic ink covering from a first state having first energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, to a second state having second energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, wherein the second energy absorptive properties allow less thermal energy to enter the payload than the first energy absorptive properties.

Claims

1. A balloon payload, comprising:

a balloon payload structure attached to a balloon envelope;

an outer surface of the balloon payload structure comprised of an electronic ink covering, and

a control system configured to change the electronic ink covering from a first state having first energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, to a second state having second energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, wherein the second energy absorptive properties allow less thermal energy to enter the payload than the first energy absorptive properties.

2. The balloon payload of claim 1, wherein the electronic ink covering is comprised of an electrophoretic display.

3. The balloon payload of claim 1, wherein the first state of the electronic ink covering provides a dark-colored surface on the electronic ink covering, and the second state of the electronic ink covering provides a light-colored surface on the electronic ink covering.

4. The balloon payload of claim 3, wherein the dark-colored surface on the electronic ink covering in the first state allows more solar energy to be absorbed by the payload than when the electronic ink covering is in the second state.

5. The balloon payload of claim 1, wherein the electronic ink covering includes a first electrode and a second electrode with dielectric fluid and a suspension of particles positioned between the first and second electrodes.

6. The balloon payload of claim 5, wherein the particles visually contrast with the dielectric fluid, and wherein the control system is configured to create a potential between the first electrode and the second electrode, such that the particles are caused to migrate toward one of the electrodes.

7. The balloon payload of claim 5, wherein microcapsules are positioned between the electrodes and dielectric fluid and particles are positioned within the microcapsules.

8. The balloon payload of claim 6, wherein the particles are dark-colored, and when the potential between the first electrode and second electrode is created, the dark-colored particles migrate towards the electrode on the outer surface of the electronic ink covering to create the first state.

9. The balloon payload of claim 7, wherein the particles within the microcapsules are dark-colored, and when the potential between the first electrode and second electrode is created, the dark-colored particles migrate towards the electrode on the outer surface of the electronic ink covering to create the first state.

10. The balloon payload of claim 1, wherein the change from the first state to the second state is caused when a predetermined temperature is detected within the payload.

11. The balloon payload of claim 1, wherein the payload is secured beneath the balloon envelope when the balloon envelope is aloft.

12. A balloon payload, comprising:

a balloon payload structure;

an outer surface of the balloon payload structure comprised of an electronic ink covering, and

a control system configured to change the electronic ink covering from a first state having first energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, to a second state having second energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, wherein the second energy absorptive properties allow more thermal energy to enter the payload than the first energy absorptive properties;

wherein the balloon payload structure is carried beneath a balloon envelope adapted to be filled with a lifting gas.

13. A computer-implemented method, comprising:

causing a payload of a balloon to be placed in a first state wherein the payload includes a payload structure where an outer surface of the payload structure is comprised of an electronic ink covering, where in the first state, the electronic ink covering has first energy absorptive properties with respect to the thermal energy that enters the payload through the electronic ink covering,

causing the payload of the balloon to change to a second state, where in the second state, the electronic ink covering has second energy absorptive properties that allow less thermal energy to enter the payload than when the electronic ink covering is in the first state.

14. The computer-implemented method of claim 13, wherein the electronic ink covering is comprised of an electrophoretic display.

15. The computer-implemented method of claim 13, wherein the first state of the electronic ink covering provides a dark-colored surface on the electronic ink covering, and the second state of the electronic ink covering provides a light-colored surface on the electronic ink covering.

16. The computer-implemented method of claim 13, wherein the electronic ink covering includes a first electrode and a second electrode with dielectric fluid and a suspension of particles positioned between the first and second electrodes.

17. The computer-implemented method of claim 16, wherein the particles visually contrast with the dielectric fluid, and wherein a potential is created between the first electrode and the second electrode, such that the particles are caused to migrate toward one of the electrodes.

18. The computer-implemented method of claim 17, wherein the particles are dark-colored, and when the potential between the first electrode and second electrode is created, the dark-colored particles migrate towards the electrode on the outer surface of the electronic ink covering to create the first state.

19. The computer-implemented method of claim 13, further including causing the payload of the balloon to change back to the first state.

20. The computer-implemented method of claim 13, wherein the change from the first state to the second state is caused when a predetermined temperature is detected within the payload.

21. A non-transitory computer readable medium having stored therein instructions executable by a computing device to cause the computing device to perform functions comprising:

causing a payload of a balloon to be placed in a first state wherein the payload includes a payload structure where an outer surface of the payload structure is comprised of an electronic ink covering, where in the first state, the electronic ink covering has first energy absorptive properties with respect to thermal energy that enters the payload through the electronic ink covering, causing the payload of the balloon to change to a second state, where in the second state, the electronic ink covering has second energy absorptive properties that allow less thermal energy to enter the payload through the electronic ink covering than when the electronic ink covering is in the first state.

22. The non-transitory computer readable medium of claim 21, wherein the electronic ink covering is comprised of an electrophoretic display.

23. The non-transitory computer readable medium of claim 21, wherein the first state of the electronic ink covering provides a dark-colored surface on the electronic ink covering, and the second state of the electronic ink covering provides a light-colored surface on the electronic ink covering.

24. The non-transitory computer readable medium of claim 21, wherein the electronic ink covering includes a first electrode and a second electrode with dielectric fluid and a suspension of particles positioned between the first and second electrodes.

25. The non-transitory computer readable medium of claim 24, wherein the particles visually contrast with the dielectric fluid, and wherein the control system is configured to create a potential between the first electrode and the second electrode, such that the particles are caused to migrate toward one of the electrodes.

26. The non-transitory computer readable medium of claim 25, wherein the particles are dark-colored, and when the potential between the first electrode and second electrode is created, the dark-colored particles migrate towards the electrode on the outer surface of the electronic ink covering to create the first state.