Electrochromic element, method of driving the same, an optical filter, lens unit, image pick-up device and window material

• US 9,798,213 B2
• Filed: 06/01/2016
• Issued: 10/24/2017
• Est. Priority Date: 06/03/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kubo, Wataru, Miyazaki, Kazuya
• Primary Examiner(s): TRA, TUYEN Q
• Application Number:
  US15/170,091
• Publication Number:
  US 20160357082A1
• Time in Patent Office: 510 Days
• Field of Search: 359265-275, 359900, 345105
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor

Abstract

Provided is an electrochromic element, including: a first electrode and a second electrode, at least one of the first electrode and the second electrode being transparent; a third electrode; and an electrolyte, an anodic organic electrochromic material, and a cathodic organic electrochromic material that are arranged between the first electrode and the second electrode, in which the third electrode is electrically connectable to at least one of the first electrode and the second electrode via the electrolyte, and in which the third electrode has an effective area that is larger than an effective area of the first electrode and an effective area of the second electrode.

Claims

1. An electrochromic element, comprising:

a first electrode and a second electrode, at least one of the first electrode and the second electrode being transparent;

a third electrode; and

an electrolyte, an anodic organic electrochromic material, and a cathodic organic electrochromic material that are arranged between the first electrode and the second electrode,

wherein the third electrode is electrically connectable to at least one of the first electrode and the second electrode via the electrolyte, and

wherein the third electrode has an effective area that is larger than an effective area of the first electrode and an effective area of the second electrode.

2. The electrochromic element according to claim 1, wherein the third electrode is arranged out of an optical path of light that passes through at least one of the first electrode and the second electrode.

3. The electrochromic element according to claim 1, wherein the third electrode is arranged at least part of a periphery of one of the first electrode and the second electrode.

4. The electrochromic element according to claim 1, wherein the third electrode comprises a porous electrode having a nanometer-scale fine structure.

5. The electrochromic element according to claim 1, wherein the third electrode comprises a metal oxide.

6. The electrochromic element according to claim 1, wherein at least one of the anodic organic electrochromic material and the cathodic organic electrochromic material is fixed to one of the first electrode and the second electrode.

7. The electrochromic element according to claim 1, further comprising a structure arranged between the third electrode and one of the first electrode and the second electrode, and configured to reduce substance transport.

8. The electrochromic element according to claim 1, further comprising a unit configured to detect a charge balance state of the electrochromic element.

9. The electrochromic element according to claim 8, wherein the unit configured to detect a charge balance state comprises a unit configured to detect a charge balance state using light absorption of at least one of the anodic organic electrochromic material and the cathodic organic electrochromic material.

10. An optical filter, comprising the electrochromic element of claim 1.

11. An image pickup apparatus, comprising:

the optical filter of claim 10; and

a light-receiving element configured to receive light that has passed through the optical filter.

12. A lens unit, comprising:

the optical filter of claim 10; and

an optical system including a plurality of lenses.

13. A window, comprising the electrochromic element of claim 1.

14. A method of driving an electrochromic element,

the electrochromic element comprising:

a first electrode and a second electrode, at least one of the first electrode and the second electrode being transparent;

a third electrode; and

an electrolyte, an anodic organic electrochromic material, and a cathodic organic electrochromic material that are arranged between the first electrode and the second electrode,

the method comprising;

controlling a voltage to be applied between at least one of the first electrode and the second electrode and the third electrode depending on a detected charge balance state of the electrochromic element.

15. The method of driving an electrochromic element according to claim 14, further comprising, after voltage application in the controlling a voltage, determining whether or not additional voltage application is necessary depending on a further detected charge balance state of the electrochromic element.

16. A method of driving an electrochromic element,

the electrochromic element comprising:

a first electrode;

a second electrode;

a third electrode; and

an electrolyte, an anodic organic electrochromic material, and a cathodic organic electrochromic material that are arranged between the first electrode and the second electrode,

the third electrode being electrically connected to at least one of the first electrode and the second electrode,

the method comprising;

controlling a voltage to be applied between at least one of the first electrode and the second electrode and the third electrode depending on a detected charge balance state of the electrochromic element.

17. The method of driving an electrochromic element according to claim 16, wherein the third electrode has an effective area that is larger than an effective area of the first electrode and an effective area of the second electrode.