LENS MODULE WITH INFRARED ABSORBING FILTER

• US 20130120823A1
• Filed: 03/14/2012
• Published: 05/16/2013
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: PEI, SHAO-KAI
• Granted Patent: US 8,867,118 B2
• Time in Patent Office: Days
• US Class Current: 359/275
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G02F 1/1524 Transition metal compounds
• CPC Class Codes: G02F 1/153 Constructional details
• CPC Class Codes: G02F 1/157 Structural association of cells with optical devices, e.g. reflectors or illuminating devices
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
• CPC Class Codes: G02F 2203/055 wavelength filtering
• CPC Class Codes: G02F 2203/11 involving infrared radiation

Abstract

A lens module includes an infrared absorbing filter. The infrared absorbing filter includes an electrochromic substrate. The electrochromic substrate changes from colorlessness to blue when a preset voltage is applied on the electrochromic substrate. The electrochromic substrate is configured for absorbing the infrared constituent of incoming light rays when the color is changed to blue.

Claims

1. A lens module, comprising:

an infrared absorbing filter comprising;

an electrochromic substrate;

wherein a color of the electrochromic substrate is changed to blue when a preset voltage is applied on the electrochromic substrate, the electrochromic substrate is configured for absorbing infrared light rays of light rays projected on the lens module when the color is changed to blue.

2. The lens module of claim 1, further comprising a lens barrel and at least one lens received in the lens barrel, the lens barrel comprising an object-side end and an image-side end opposite to the object-side end, the infrared absorbing filter received in the lens barrel adjacent to the image side end in relative to the at least one lens.

3. The lens module of claim 2, further comprising an image sensor positioned at the image-side end, wherein the infrared absorbing filter is positioned between the least one lens and the image sensor.

4. The lens module of claim 1, wherein the value of the voltage applied on the electrochromic substrate gradually increases from 0 to the preset voltage, and the color of the electrochromic substrate gradually changes from colorlessness to blue.

5. The lens module of claim 1, wherein the electrochromic substrate comprises a first transparent conductive glass, a second transparent conductive glass, a metal ion film, an electrolytic film, and a metal oxide film;

the metal ion film, the electrolytic film, and the metal oxide film are orderly positioned between the first transparent conductive glass and the second transparent conductive glass.

6. The lens module of claim 5, wherein the metal ion film is a lithium(Li) film, the metal oxide film is a WO₃ film.

7. The lens module of claim 5, wherein the infrared absorbing filter comprises an anti-reflection film and an infrared filtering film, the electrochromic substrate is positioned between the anti-reflection film and the infrared filtering film.

8. The lens module of claim 7, wherein the anti-reflection film is coated on the first transparent conductive glass.

9. The lens module of claim 7, wherein the infrared filtering film is coated on the second transparent conductive glass.