Infrared cut optical filter and lens module using the infrared cut

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 (...

AI Technical Summary

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 difference, so that part of the visible light is filtered, so that the picture formed by the lens module passes through. The color of the center and the edge area shows a large difference

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