Camera Filter Assembly with Preformed Shielding Sheet
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Solution Overview
Problem
Conventional camera module filters face challenges in effectively shielding flare caused by peripheral components, leading to reduced image quality, and the method of applying a black ink layer is costly and difficult to adjust.
Innovation Solution
A filter assembly with a non-light transmissive sheet body preformed to fit the filter, allowing specific wavelength light to pass through, while blocking flare and fine dust, and being easily adjustable in size and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black ink layer is printed on the filter by oil printing method to shield flare, then the image quality is improved, but the manufacturing cost increases and adjustment becomes difficult
Solution Approach 1:
The filter is divided into two functional parts: a light transmissive region for passing specific wavelength light and a non-light transmissive region (black region) for shielding flare. This segmentation allows each region to perform its specific function independently, effectively reducing flare while maintaining image quality without requiring complex oil printing processes
Solution Approach 2:
Different regions of the filter are given different optical properties: the central region is made light transmissive for the specific wavelength range needed for imaging, while the peripheral regions are made non-light transmissive to block flare. This local differentiation of optical properties enables targeted flare reduction without affecting the overall imaging performance
2Area of stationary object
If the area of the filter is made greater than the effective light sensing area of the image sensor to avoid blocking focused light, then the filter coverage is improved, but the flare shielding effectiveness is reduced
Solution Approach 1:
The filter employs local quality differentiation where the central region has light transmissive properties to allow focused light passage, while the peripheral regions have non-light transmissive properties to block flare. This enables the filter to extend beyond the effective light sensing area for complete coverage without compromising image quality
Solution Approach 2:
The filter is segmented into a central light transmissive region corresponding to the effective light sensing area and peripheral non-light transmissive regions. This segmentation strategy allows the filter to maintain both large area coverage and effective flare shielding by assigning different functional properties to different spatial zones
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 solution effectively shields flare and fine dust, simplifying assembly and reducing costs compared to traditional methods, while allowing for precise adjustment of the light transmissive region to suit different optical systems.
Implementation Method 1
a filter mounted on a frame is usually disposed between the lens and the image sensor to block passage of, for example, the infrared rays
Implementation Method 2
a non-light transmissive first sheet body preformed and adhered to a surface of the filter... The first sheet body has the function of shielding flare
Data Source
AI summary
A filter assembly includes a filter defining a light transmissive region for light of a specific wavelength range to pass therethrough, and a non-light transmissive first sheet body preformed and adhered to a surface of the filter. The first sheet body has a first opening with a shape conforming to that of the light transmissive region.