Optical filter, camera module and manufacturing method thereof

Abstract

The invention provides an optical filter capable of preventing the camera module from generating stray light, a camera module using the filter, and a manufacturing method thereof. The camera module includes a lens, a bracket for fixing the lens, an optical filter located under the lens, and an image sensor located under the optical filter, wherein the optical filter includes an infrared cut filter and a block Light-shielding film, the light-shielding film is set on the infrared cut-off filter, and there is a window in the middle of the light-shielding film, so that a light-transmitting area is formed in the middle of the infrared-cutting light-filter, and a light-shielding area is formed outside the light-transmitting area.

Description

technical field [0001] The invention relates to the field of camera modules, in particular to an optical filter for effectively intercepting light incident on the surface of a gold wire around an image sensor and the light on an inner wall of a lens bracket and an imaging module using the filter. Background technique [0002] With the development of mobile phone camera modules in the direction of high pixel, large aperture, and ultra-thin, consumers have higher and higher requirements for the image quality of camera modules. Existing mobile phone camera modules such as figure 1 As shown, it includes a lens 10, a bracket 11 for fixing the lens 10, a filter 12 arranged under the lens 10, an image sensor 13 arranged under the filter 12, and a circuit electrically connected with the image sensor 13 plate 14. The filter 12 is mainly an infrared cut-off filter, and its function is to filter the infrared light in the light, so that the imaging effect of the camera module is close...

AI Technical Summary

Problems solved by technology

[0003] However, the existing camera modules often have the problem of stray light when shooting

figure 2 It shows that when the light source moves out of the imaging surface by 35°~40°, the edge of the corresponding position of the imaging surface presents purple-red stray light, which affects the imaging quality of the mobile phone camera module

After research and analysis, the main reason for this problem is that the large-angle light incident on the surface of the gold wire connecting the image sensor 13 and the circuit board 14 or the stray light generated by the reflection on the inner wall of the bracket 11 causes

like figure 1 As shown, the light is reflected by the raised area 111 of the window edge of the bracket 11, or reflected by the surface area 141 of several gold wires connected with the circuit board 14 and the image sensor 13, and then enters the camera module and passes through the image sensor 13 imaging, causing stray light

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