Infrared cut-off filter and lens module

A technology of infrared cutoff and lens module, which is applied in the direction of optical filters, optics, optical components, etc., can solve the problem of deteriorating imaging system imaging quality, achieve the effect of preventing imaging quality and improving reflectivity

Inactive Publication Date: 2013-10-30
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sapphire has a high transmittance to infrared light, and if the infrared light cannot be filtered, the imaging quality of the imaging system will be degraded

Method used

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  • Infrared cut-off filter and lens module
  • Infrared cut-off filter and lens module
  • Infrared cut-off filter and lens module

Examples

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Embodiment Construction

[0013] like figure 1 As shown, an infrared cut filter 100 provided by an embodiment of the present invention includes a substrate 10 and an infrared cut layer 20 plated on any surface of the substrate 10 . The infrared cut-off filter 100 is used to filter out the infrared light in the light.

[0014] The substrate 10 is flat and made of sapphire material. The sapphire belongs to the corundum minerals, has a trigonal crystal system, and has a hexagonal structure. The main chemical composition of the sapphire is aluminum oxide (Al 2 O3), its refractive index is 1.76-1.78. The transmittance of the sapphire to infrared light with a wavelength of 825-1300nm is greater than 85%. The substrate 10 includes a first surface 11 and a second surface 12 opposite to the first surface 11 .

[0015] The infrared cut-off layer 20 is deposited on any surface of the substrate 10 by sputtering or vapor deposition, and is used to filter out the infrared light in the light. The infrared cut-o...

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Abstract

The invention provides an infrared cut-off filter which comprises a substrate and an infrared cut-off layer, wherein the infrared cut-off layer is arranged on the substrate in a plated mode. The substrate is made of a sapphire. The infrared cut-off layer is formed by alternately stacking multiple high-refractive index layers and low-refractive index layers and used for increasing the reflectivity of infrared rays in light and filtering the infrared rays. According to the infrared cut-off filter, the infrared cut-off layer is arranged on the substrate made of the sapphire in the plated mode, the reflectivity of the infrared rays by the sapphire substrate is effectively increased to filter the infrared rays, and therefore the imaging quality of a lens module comprising the infrared cut-off filter cannot be affected. The invention further provides the lens module comprising the infrared cut-off filter.

Description

technical field [0001] The invention relates to an optical element, in particular to an infrared cut-off filter and a lens module using the infrared cut-off filter. Background technique [0002] Sapphire is widely used in imaging systems due to its high hardness and high wear resistance. However, sapphire has high transmittance to infrared light, and if the infrared light cannot be filtered, the imaging quality of the imaging system will be degraded. Contents of the invention [0003] In view of this, it is necessary to provide an infrared cut-off filter using sapphire as a substrate and a lens module using the infrared cut-off filter that can improve the imaging quality. [0004] An infrared cut-off filter includes a base plate and an infrared cut-off layer plated on the base plate. The substrate is made of sapphire. The infrared cut-off layer is formed by alternately stacking multiple high-refractive-index layers and low-refractive-index layers, which is used to incre...

Claims

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Application Information

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IPC IPC(8): G02B5/20G02B7/02B32B9/04B32B33/00
Inventor 简士哲林君鸿魏朝沧
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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