Optical element with infrared absorbing layer and lens module including same

• US 9,122,008 B2
• Filed: 06/27/2012
• Issued: 09/01/2015
• Est. Priority Date: 03/29/2012
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Pei, Shao-Kai
• Primary Examiner(s): Chapel, Derek S
• Application Number:
  US13/534,285
• Publication Number:
  US 20130258455A1
• Time in Patent Office: 1,161 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G02B 13/003 having two lenses
• 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 5/223 containing organic substances, e.g. dyes, inks or pigments
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection

Abstract

An optical element includes a transparent substrate and an infrared absorbing layer on an object-side surface of the transparent substrate. The infrared absorbing layer is a thermo sensitive ink printed or deposited on the transparent substrate. The thermo sensitive ink is cured to blue color.

Claims

1. An optical element, comprising:

a transparent substrate comprising an object-side surface and an image-side surface opposite to the object-side surface;

an infrared absorbing layer positioned on the object-side surface of the transparent substrate;

wherein the infrared absorbing layer is a thermo-sensitive ink, the thermo-sensitive ink is cured to be in blue color; and

an infrared reflecting film coating on the image-side surface of the transparent substrate, wherein the infrared reflecting film comprises fifty-four layers stacked in an order facing away from the image-side surface;

the odd numbered layers of the infrared reflecting film are made from titanium dioxide;

the even numbered layers of the infrared reflecting film are made from silicon dioxide.

2. The optical element of claim 1, wherein the transparent substrate is a lens, and each of the object-side surface and the image-side surface is a spherical or aspheric surface.

3. The optical element of claim 1, wherein the transparent substrate is a flat disc.

4. A lens module, comprising:

a lens barrel; and

an optical element received in the lens barrel, comprising;

a transparent substrate comprising an object-side surface and an image-side surface opposite to the object-side surface;

an infrared absorbing layer positioned on the object-side surface of the transparent substrate;

wherein the infrared absorbing layer is a thermo-sensitive ink, the thermo-sensitive ink is cured to be in blue color; and

an infrared reflecting film coating on the image-side surface of the transparent substrate, wherein the infrared reflecting film comprises fifty-four layers stacked in an order facing away from the image-side surface;

the odd numbered layers of the infrared reflecting film are made from titanium dioxide;

the even numbered layers of the infrared reflecting film are made from silicon dioxide.

5. The lens module of claim 4, wherein the transparent substrate is a lens, and each of the object-side surface and the image-side surface is a spherical or aspheric surface.

6. The lens module of claim 4, wherein the transparent substrate is a flat disc.