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

• US 10,353,263 B2
• Filed: 09/19/2017
• Issued: 07/16/2019
• 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
• Application Number:
  US15/708,418
• Publication Number:
  US 20180024407A1
• Time in Patent Office: 665 Days
• Field of Search: 359265-275
• 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;

a second electrode;

an auxiliary electrode;

an electrochromic layer disposed between the first electrode and the second electrode, and in contact with the first electrode, the second electrode, and the auxiliary electrode; and

a switch,

wherein the switch performs switching between applying a voltage between the first electrode and the second electrode and applying a voltage between the first electrode and the auxiliary electrode.

2. The electrochromic element according to claim 1, wherein an effective area of the auxiliary electrode is larger than an effective area of the first electrode and an effective area of the second electrode.

3. The electrochromic element according to claim 1, at least one of the first electrode and the second electrode is transparent.

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

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

6. The electrochromic element according to claim 1, wherein the auxiliary electrode comprises a porous electrode.

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

8. The electrochromic element according to claim 1, wherein the electrochromic layer is a solution layer, which comprises an electrolyte.

9. The electrochromic element according to claim 1, wherein the electrochromic layer comprises an anodic organic electrochromic material and a cathodic organic electrochromic material, and

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.

10. The electrochromic element according to claim 1, further comprising a structure arranged between the auxiliary electrode and one of the first electrode and the second electrode,

wherein the structure is configured to reduce substance transport between the auxiliary electrode and the one of the first electrode and the second electrode.

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

12. The electrochromic element according to claim 11, wherein the unit configured to detect the charge balance state comprises a unit configured to detect the charge balance state using light absorption of the electrochromic material.

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

14. An image pick-up apparatus, comprising:

the optical filter of claim 13; and

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

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

16. The electrochromic element according to claim 1, wherein the electrochromic layer comprises a mixture including a solvent and an electrochromic material.

17. The electrochromic element according to claim 1, wherein a polarity of a voltage applied to the first electrode with the auxiliary electrode as a reference in a state of applying the voltage between the first electrode and the auxiliary electrode is opposite to a polarity of a voltage applied to the first electrode with the second electrode as a reference in a state of applying the voltage between the first electrode and the second electrode.

18. A method of driving an electrochromic element, the electrochromic element comprising:

a first electrode;

a second electrode;

an auxiliary electrode;

a switch; and

an electrochromic layer disposed between the first electrode and the second electrode, and in contact with the first electrode, the second electrode, and the auxiliary electrode,

the method comprising;

controlling a voltage to be applied between the first electrode and the second electrode or between the first electrode and the auxiliary electrode.

19. The method according to claim 18, wherein the controlling of the voltage is performed depending on a detected charge balance state of the electrochromic element.

20. An electrochromic element comprising:

a first electrode;

a second electrode;

an auxiliary electrode;

an electrochromic material disposed between the first electrode and the second electrode;

a switch, and

a structure,

wherein the switch performs switching between applying a voltage between the first electrode and the second electrode and applying a voltage between the first electrode and the auxiliary electrode,

wherein the structure is arranged between the auxiliary electrode and one of the first electrode and the second electrode, and

wherein the structure is configured to reduce substance transport between the auxiliary electrode and the one of the first electrode and the second electrode.