Infrared cut optical filter and lens module using the infrared cut

A technology of infrared cut-off and lens module, which is applied in the field of optical filters, can solve the problems of cut-off spectrum shift, color difference between the center and edge area, etc., and achieve the effect of suppressing short-wave shift and small color performance difference

Inactive Publication Date: 2009-05-06
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the light is incident on the multilayer film at different angles, the cut-off spectrum shifts to the short-wave direction due to the difference in optical path differen...

Method used

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  • Infrared cut optical filter and lens module using the infrared cut
  • Infrared cut optical filter and lens module using the infrared cut
  • Infrared cut optical filter and lens module using the infrared cut

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Embodiment Construction

[0015] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0016] Such as figure 1 As shown, the lens module 20 can be used in digital cameras, video cameras and other imaging devices. The lens module 20 sequentially includes a lens group 200 , an infrared cut filter 300 and an image sensing device 400 from the object side to the image side. The lens group 200 may include a single lens element, or may include several lens elements, such as lens elements 202 , 204 and 206 . The lens group 200 is used to receive incident light from the outside, and can correct aberrations, chromatic aberrations and the like. The position between the lens elements 202, 204 and 206 can also be adjusted to change the optical zoom parameters of the lens. The infrared cut-off filter 300 is used to filter the light in the infrared band after passing through the lens group 200 , and let the light in other bands pass through, so ...

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Abstract

The invention relates to an infrared cut-off filter which comprises a basal body layer, a first film stack, a second film stack and a third film stack, wherein the first film stack, the second film stack and the third film stack are orderly formed on the basal body layer, are respectively and alternately formed by high refractive index materials and low refractive index materials and have different optical thicknesses. The invention also provides a lens die set which comprises the infrared cut-off filter.

Description

technical field [0001] The invention relates to a light filter, in particular to an infrared cut-off filter and a lens module using the infrared cut-off filter. Background technique [0002] Generally speaking, image capturing devices such as digital cameras and video cameras include a lens module for capturing light, and the optical performance of the lens module affects the quality of the imaging image. A lens module generally includes a lens or a lens group and an image sensing element. The lens or the lens group is used to receive the light emitted by external objects, etc., and converge the light onto the image sensing element. The image sensing element may be a semiconductor element such as a CCD or a CMOS, and is used to convert an optical signal into an electrical signal for subsequent circuit processing. [0003] Due to the photoelectric effect, semiconductor elements such as CCD or CMOS can not only sense visible light, but also sense light in the infrared band (...

Claims

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Application Information

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IPC IPC(8): G02B5/28G02B5/20G03B11/04G02B7/02
CPCG02B5/281
Inventor 林君鸿
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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