Circuit Board Optical Blocking Body for Camera Light Interference
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Solution Overview
Problem
The opening in the circuit board of a camera module allows ambient light to enter, reducing imaging quality by being imaged in the photosensitive chip.
Innovation Solution
A circuit board assembly with an optical blocking body made of black heat conducting silica gel is used to prevent ambient light from reaching the sensor, improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an opening is defined in the circuit board to receive the photosensitive chip, then the height of the camera module is reduced, but ambient light can enter through the opening and reduce imaging quality
Solution Approach 1:
The circuit board is segmented into multiple layers with different functions. The opening in the first circuit board is precisely positioned to receive the photosensitive chip, while a second circuit board is positioned to block ambient light from entering through the opening. This segmentation allows the system to simultaneously achieve reduced height and light blocking functionality.
Solution Approach 2:
A second circuit board is introduced as an intermediary element between the ambient light source and the opening in the first circuit board. This intermediate structure serves as a light shield that blocks harmful ambient light while allowing the photosensitive chip to be properly positioned and connected through the opening.
2Object-affected harmful factors
If a light blocking structure is added to block ambient light, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The second circuit board serves multiple functions simultaneously: it provides electrical connections through its conductive patterns, acts as a light blocking shield through its opaque material, and provides structural support for the camera module assembly. This multi-functionality reduces device complexity by consolidating multiple components into a single element.
Solution Approach 2:
The light blocking function is merged with the electrical connection function by making the second circuit board both an opaque light shield and a conductive circuit carrier. The conductive patterns on the second circuit board provide electrical connections while the opaque material blocks light, combining two functions into one integrated component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of the optical blocking body effectively blocks ambient light, preventing glare and overexposure, thereby enhancing the imaging quality of the camera module.
Implementation Method 1
an optical blocking body made of black heat conducting silica gel is used to prevent ambient light from reaching the sensor
Implementation Method 2
black heat conducting silica gel
Data Source
AI summary
A circuit board assembly in a camera module for blocking unwanted light when images are captured includes a circuit board, a sensor, and an optical blocking body connecting the circuit board and the sensor. The circuit board includes a base board and a photomask. The photomask is arranged on a surface of the base board, the base board includes conductive circuit layers and dielectric layers, the conductive circuit layers and the dielectric layers are alternately arranged, the sensor being electronically connected to the conductive layers. The optical blocking body, the photomask, and the dielectric layers block ambient light entering the camera module other than through the lens assembly of the camera module.