Camera lens module and manufacturing method thereof
A camera lens module includes an image sensor and a lens assembly. The image sensor includes a photosensitive chip defining a photosensitive path, wherein the lens assembly is coupled to the image sensor along the photosensitive path of the photosensitive chip. The lens assembly includes at least one optical lens module and an aperture member coupled at the optical lens module, wherein the optical lens module includes a lens barrel and at least an optical lens supported within the lens barrel. A relative position of the lens assembly with respect to the image sensor is adjustable for calibration and the relative position of the optical lens module is permanently fixed after calibration.
1. A method of assembling a camera lens module, comprising the steps of:
(A) pre-assembling an optical lens module of an lens assembly with an image sensor to form a pre-assembled optical lens module in a pre-assembling state, wherein said image sensor is installed in said optical lens module along a photosensitive path and a relative position of said pre-assembled optical lens module is adjustable with respect to said image sensor;
(B) acquiring an image signal through said optical lens module of said lens assembly, wherein said camera lens module after pre-assembled is electrified and collects image;
(C) determining a calibration measurement of said lens optical module and an optical lens of said lens assembly by a calibration software;
(D) adjusting a relative position of said optical lens module and said optical lens of said lens assembly in response to said calibration measurement;
(E) when said relative position of each of said optical lens module and said optical lens is adjusted to obtain a desired resolution of said camera lens module, going to the following step (F), or otherwise, repeating steps (B) to (D) until a desired resolution of said camera lens module is obtained; and
(F) affixing said camera lens module;
wherein an image collection of said camera lens module in the step (B) is based on MTF (Modulation Transfer Function), wherein said image quality is determined by a MTF value, wherein a higher MTF value refers to higher image quality and a plurality of MTF value is determined for every image collected from said camera lens module and is compared with a predetermined threshold, wherein when said MTF value is greater than or equal to a predetermined threshold, a collection and calibration is completed, wherein when said MTF value is less than said predetermined threshold, said image collection is repeated for further calibration.
2. The method, as recited in claim 1 , wherein in the step (A), said optical lens assembly before assembled comprises at least two said optical lens modules and each of said optical lens modules comprises at least an optical lens and at least a barrel supported therein.
3. A method of assembling a camera lens module, comprising the steps of:
(A) pre-assembling an optical lens module of an lens assembly with an image sensor to form a pre-assembled optical lens module in a pre-assembling state, wherein said image sensor is installed in said optical lens module along a photosensitive path and a relative position of said pre-assembled optical lens module is adjustable with respect to said image sensor;
(B) acquiring an image signal through said optical lens module of said lens assembly;
(C) determining a calibration measurement of said lens optical module and an optical lens of said lens assembly by a calibration software;
(D) adjusting a relative position of said optical lens module and said optical lens of said lens assembly in response to said calibration measurement;
(E) when said relative position of each of said optical lens module and said optical lens is adjusted to obtain a desired resolution of said camera lens module, going to the following step (F), or otherwise, repeating steps (B) to (D) until a desired resolution of said camera lens module is obtained; and
(F) affixing said camera lens module;
wherein in the step (C), said calibration software is used for calibration by the following steps:
(1) measuring optical characteristics of said camera lens module prior to said calibration, including MTF (Modulation Transfer Function) values, a light eccentricity measurement, a light axis inclination angle, and a curvature of field; and
(2) in response to said MTF values, said light eccentricity measurement, said light axis inclination angle, and said curvature of field corresponding to relative positions of said optical lens module, determining said calibration measurement of said optical lens module.
4. The method, as recited in claim 3 , wherein in the step (A), said optical lens assembly before assembled comprises at least two said optical lens modules and each of said optical lens modules comprises at least an optical lens and at least a barrel supported therein.