OPTICAL APPARATUS AND AUTOMOBILE LIGHTING

• US 20150117041A1
• Filed: 10/09/2014
• Published: 04/30/2015
• Est. Priority Date: 10/24/2013
• Status: Active Grant

• Current Assignee: National University Corporation Chiba University, Stanley Electric Company Limited
• Original Assignee: National University Corporation Chiba University, Stanley Electric Company Limited
• Inventors: FUKUSHIMA, Hiroto, TOKO, Yasuo, KOBAYASHI, Norihisa
• Granted Patent: US 9,588,394 B2
• Time in Patent Office: Days
• US Class Current: 362/487
• CPC Class Codes: F21S 41/28 Cover glass
• CPC Class Codes: F21S 41/285 Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
• CPC Class Codes: F21S 41/645 by electro-optic means, e.g. liquid crystal or electrochromic devices
• CPC Class Codes: F21S 43/255 Filters
• CPC Class Codes: F21S 43/26 Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
• CPC Class Codes: G02F 1/1506 caused by electrodeposition, e.g. electrolytic deposition of an inorganic material on or close to an electrode
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor

Abstract

An optical apparatus includes first and second substrates disposed to oppose each other, the first substrate having a first electrode provided on a surface of the first substrate nearer to the second substrate, and the second substrate having a second electrode provided on a surface of the second substrate nearer to the first substrate, and an electrolyte layer sandwiched between the first and the second substrates, and containing electro-deposition material including silver, wherein when potential of the first electrode is used as reference, a first voltage of positive polarity is applied in a first period to the second electrode, and a second voltage of positive polarity lower than the first voltage is applied in a second period after the first period to the second electrode.

Claims

1. An optical apparatus comprising optical element and power source, wherein:

the optical element comprises,

first and second substrates disposed to oppose each other, the first substrate having a first electrode provided on a surface of the first substrate nearer to the second substrate, and the second substrate having a second electrode provided on a surface of the second substrate nearer to the first substrate, and

an electrolyte layer sandwiched between the first and the second substrates, and containing electro-deposition material including silver; and

the power source is connected to the first and second electrodes, and is capable of applying plural types of voltage to the electrolyte layer through the first and second electrodes and changing color states of the optical element.

2. The optical apparatus according to claim 1, wherein when potential of the first electrode is used as reference, the power source is capable of applying a first voltage of positive polarity in a first period to the second electrode, and applying a second voltage of positive polarity lower than the first voltage in a second period after the first period to the second electrode.

3. The optical apparatus according to claim 2, wherein when potential of the first electrode is used as reference, the power source is capable of applying positive dc voltage to the second electrode.

4. The optical apparatus according to claim 2, wherein the second substrate includes a conductive irregular surface layer, the surface of which is at least rougher than the surface of the first electrode, provided on the surface of the second electrode.

5. The optical apparatus according to claim 4, wherein the power source is also capable of supplying a negative dc voltage to the second electrode when potential of the first electrode is used as reference.

6. The optical apparatus according to claim 1, wherein the first and second substrates have flexibility.

7. Automobile lighting comprising:

light source capable of emitting white lights;

cover member disposed to cover the light source, and having lens function;

optical element disposed on inner or outer surface of the cover member, and comprising,

first and second substrates disposed to oppose each other, the first substrate having a first electrode provided on a surface of the first substrate nearer to the second substrate, and the second substrate having a second electrode provided on a surface of the second substrate nearer to the first substrate, and

an electrolyte layer sandwiched between the first and the second substrates, and containing electro-deposition material including silver; and

power source connected to the first and second electrodes, and being capable of applying plural types of voltage to the electrolyte layer through the first and second electrodes and changing color states of the optical element.

8. The automobile lighting according to claim 7, wherein when potential of the first electrode is used as reference, the power source is capable of applying a first voltage of positive polarity in a first period to the second electrode, and applying a second voltage of positive polarity lower than the first voltage in a second period after the first period to the second electrode.

9. The automobile lighting according to claim 7, wherein the second substrate of the optical apparatus includes a conductive irregular surface layer, the surface of which is at least rougher than the surface of the first electrode, provided on the surface of the second electrode.

10. A method of driving an optical element comprising first and second substrates disposed to oppose each other, the first substrate having a first electrode provided on a surface of the first substrate nearer to the second substrate, and the second substrate having a second electrode provided on a surface of the second substrate nearer to the first substrate, and an electrolyte layer sandwiched between the first and the second substrates, and containing electro-deposition material including silver, comprising when potential of the first electrode is used as reference,

applying a first voltage of positive polarity in a first period to the second electrode;

and

applying a second voltage of positive polarity lower than the first voltage in a second period after the first period to the second electrode.