LENS MODULE AND METHOD FOR ASSEMBLING THE SAME
A lens module to exclude stray and internally-reflected light and thereby avoid flares and stains in images includes a lens unit, a circuit board, an image sensor, an optical filter, and a hollow mounting frame. The lens unit includes hollow lens holder and lens therein. The image sensor is connected onto the circuit board. The optical filter is at one side of the mounting frame, opposing side is fixed to the circuit board to enclose the image sensor. A light blocking layer is formed on four sides of a surface of the optical filter facing away from the image sensor. A structurally-significant dustproof adhesive layer fills a first gap between the mounting frame and the optical filter and a second gap between the mounting frame and the shielding layer. The lens holder is connected to the mounting frame.
1 . A method for assembling a lens module, comprising:
providing a circuit board, an image sensor, an optical filter, a hollow mounting frame, a lens, and a hollow lens holder;
mounting the lens in the lens holder to form a lens unit;
connecting the image sensor onto the circuit board;
connecting the optical filter onto a side of the mounting frame, connecting an opposite side of the mounting frame to the circuit board, thereby receiving the image sensor in the mounting frame and positioning the optical filter above the image sensor, the optical filter having a surface facing away from the image sensor;
forming a shielding layer on four sides of the surface of the optical filter;
filling dustproof adhesive in at least one of a first gap between the mounting frame and the optical filter and a second gap between the mounting frame and the shielding layer, solidifying the dustproof adhesive to form a dustproof adhesive layer; and
connecting the lens holder of the lens unit onto the mounting frame to position the lens above the image sensor.
2 . The method of claim 1 , wherein the shielding layer is formed by printing ink on the surface of the optical filter.
3 . The method of claim 1 , wherein edges of the shielding layer are aligned with edges of the optical filter.
4 . The method of claim 1 , wherein the mounting frame defines a receiving hole for receiving the image sensor, the mounting frame is recessed around the receiving hole to form a stepped portion, the optical filter is glued onto the stepped portion with an adhesive layer, causing the optical filter to be flush with the mounting frame.
5 . The method of claim 1 , wherein the circuit board has electronic components and gold fingers on a surface, the image sensor is connected onto the surface of the circuit board having the electronic components and the gold fingers, the gold fingers are positioned around the image sensor.
6 . The method of claim 5 , wherein a surface of the image sensor facing away from the circuit board has metallic wires, the metallic wires are electrically connected to the gold fingers.
7 . The method of claim 1 , wherein the lens holder is a voice coil motor.
8 . A lens module comprising:
a lens unit comprises a hollow lens holder and a lens mounted in the lens holder;
a circuit board;
an image sensor connected onto the circuit board;
an optical filter;
a hollow mounting frame, the optical filter connected to a side of the mounting frame, an opposite side of the mounting frame connected to the circuit board, thereby receiving the image sensor in the mounting frame and positioning the optical filter above the image sensor, the optical filter having a surface facing away from the image sensor;
a shielding layer formed on four sides of the surface of the optical filter;
a dustproof adhesive layer filling in at least one of a first gap between the mounting frame and the optical filter and a second gap between the mounting frame and the shielding layer, the lens holder of the lens unit connected to the mounting frame to position the lens above the image sensor.
9 . The lens module of claim 8 , wherein the shielding layer is made of printing ink.
10 . The lens module of claim 8 , wherein edges of the shielding layer are aligned with edges of the optical filter.
11 . The lens module of claim 8 , wherein the mounting frame defines a receiving hole for receiving the image sensor, the mounting frame is recessed around the receiving hole to form a stepped portion, the optical filter is glued onto the stepped portion with an adhesive layer, causing the optical filter to be flush with the mounting frame.
12 . The lens module of claim 8 , wherein the circuit board has electronic components and gold fingers on a surface, the image sensor is connected onto the surface of the circuit board having the electronic components and the gold fingers, the gold fingers are positioned around the image sensor.
13 . The lens module of claim 12 , wherein a surface of the image sensor facing away from the circuit board has metallic wires, the metallic wires are electrically connected to the gold fingers.