Electrochromic apparatus and method of driving electrochromic device, as well as optical filter, lens unit, imaging apparatus and window member

Patent metadata

Field	Value
Publication number	US-10437127-B2
Application number	US-201815920687-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 22, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

An electrochromic apparatus comprises an electrochromic device and a drive unit operating for normal drive and heating drive of the electrochromic device. The electrochromic device comprises a pair of electrodes and an electrochromic layer including at least an electrochromic material and a solvent. Each of the paired electrodes has at least a pair of power supply sections on a surface thereof. The pair of power supply sections include a first power supply section and a second power supply section arranged oppositely relative to the first power supply section on the surface. The drive unit operates for the heating drive such that the electrochromic layer is heated by applying an alternating voltage between the pair of power supply sections of each of the paired electrodes so as to put any oppositely disposed positions of the paired electrodes in phase with each other.

First claim

What is claimed is:

1. An electrochromic apparatus comprising an electrochromic device and a drive unit operating for normal drive and heating drive of the electrochromic device,
the electrochromic device comprising a pair of oppositely disposed electrodes and an electrochromic layer arranged between the pair of electrodes,
the electrochromic layer including at least an electrochromic material and a solvent,
each of the paired electrodes having at least a pair of power supply sections on a surface thereof,
the pair of power supply sections including a first power supply section and a second power supply section arranged oppositely relative to the first power supply section on the surface,
wherein the drive unit is configured to operate for the heating drive such that the electrochromic layer is heated by applying an alternating voltage between the pair of power supply sections of each of the paired electrodes so as to put any oppositely disposed positions of the paired electrodes in phase with each other.

2. The electrochromic apparatus according to claim 1 , wherein
each of the paired electrodes has N+1 pairs of power supply sections (n being an integer not smaller than 1) and the drive unit operates for the heating drive by applying a voltage pulse to each of the N+1 pairs of power supply sections, and wherein
the voltage pulses applied to the respective pairs of power supply sections commonly have the same waveform and have phases shifted by 2π/(N+1) radians from each other.

3. The electrochromic apparatus according to claim 1 , wherein
the drive unit operates for the heating drive by way of voltage modulation.

4. The electrochromic apparatus according to claim 1 wherein
the drive unit operates for the heating drive prior to the normal drive.

5. The electrochromic apparatus according to claim 1 , wherein
the drive unit operates for the heating drive during a pause period of the normal drive.

6. The electrochromic apparatus according to claim 1 , further comprising a temperature detector for detecting a temperature of the electrochromic device, wherein
the drive unit operates for the heating drive when the temperature detected by the temperature detector shows a value not higher than a predetermined value.

7. The electrochromic apparatus according to claim 1 , wherein
each of the paired electrodes has a rectangular contour and the pair of power supply sections on the surface include a pair of low resistance wirings arranged respectively along the oppositely disposed long sides of the electrode and a pair of power supply terminals connected respectively to the pair of low resistance wirings.

8. The electrochromic apparatus according to claim 1 , wherein
each of the paired electrodes have a circular contour and the pair of power supply sections on the surface include a pair of low resistance wirings arranged respectively along the outer periphery of the electrode and disposed oppositely relative to each other and a pair of power supply terminals connected respectively to the paired low resistance wirings.

9. The electrochromic apparatus according to claim 7 , wherein
the sheet resistance of the low resistance wirings is less than 1/100 of the sheet resistance of the electrodes.

10. The electrochromic apparatus according to claim 1 , wherein
the electrochromic material is an organic compound.

11. The electrochromic apparatus according to claim 1 , wherein
the drive unit operates for the heating drive by alternately applying a positive voltage pulse and a reverse voltage pulse having the same wave height and the same pulse width between the paired power supply sections.

12. An optical filter comprising an electrochromic apparatus according to claim 1 and an active device connected to the electrochromic device that the electrochromic apparatus has.

13. The optical filter according to claim 12 , wherein
the active device operates to drive the electrochromic device and controls the amount of light passing through the electrochromic device.

14. A lens unit comprising an optical filter according to claim 12 and an imaging optical system including a plurality of lenses.

15. An imaging apparatus comprising an optical filer according to claim 12 and an imaging device for receiving the light that has passed through the optical filter.

16. A window member comprising an electrochromic apparatus according to claim 1 and an active device connected to the electrochromic device that the electrochromic apparatus has.

17. The window member according to claim 16 , wherein
the active device operates to drive the electrochromic device and controls the amount of light passing through the electrochromic device.

18. A method of driving an electrochromic device comprising a pair of oppositely disposed electrodes and an electrochromic layer arranged between the pair of electrodes, the electrochromic layer including at least an electrochromic material and a solvent, each of the paired electrodes having at least a pair of power supply sections on a surface thereof, the pair of power supply sections including a first power supply section and a second power supply section arranged oppositely relative to the first power supply section on the surface,
the method including a step of driving the electrochromic device to operate such that the electrochromic layer is heated by applying an alternating voltage between the pair of power supply sections of each of the paired electrodes so as to put any oppositely disposed positions of the paired electrodes in phase with each other to energize the paired electrodes.

Assignees

• Canon Kk

Inventors

• Miyazaki Kazuya
• Yamamoto Jun

Classifications

• E06B9/24 Primary

  Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; {Slat blinds}(operating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00) · CPC title

• G03B11/00

  Filters or other obturators specially adapted for photographic purposes · CPC title

• E06B2009/2464

  featuring transparency control by applying voltage, e.g. LCD, electrochromic panels · CPC title

• G02F1/155 Primary

  Electrodes · CPC title

• E06B3/6722

  with adjustable passage of light · CPC title