Filter-Sensor Distance Control in Image-Capturing Devices
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Solution Overview
Problem
The stability of short brackets in image-capturing devices makes it difficult to control the distance between the filter and the image sensor chip, leading to microparticles being captured by the sensor, which results in light spots and compromised image quality.
Innovation Solution
A portable electronic device with an image-capturing device that includes a carrier substrate, an image sensing chip, and a filter element, where the filter element is accommodated in a recessed space of the carrier substrate, and a lens assembly is used to maintain a distance between the filter and the image sensing chip between 30 μm and 200 μm, preventing light spots from microparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If short brackets are used to support the filter on the image sensor chip, then the device structure is simple, but the stability and flatness of the filter cannot be controlled, and microparticles are captured by the sensor
Solution Approach 1:
The filter support structure is segmented into multiple independent support points (first support point, second support point, third support point, fourth support point) distributed across the carrier substrate. This segmentation provides stable support for the filter while maintaining manufacturing simplicity, resolving the contradiction between structural simplicity and positioning precision.
Solution Approach 2:
A carrier substrate is introduced as an intermediary component between the filter and the image sensor chip. The carrier substrate provides a stable platform with precisely positioned support points, enabling accurate filter positioning without requiring complex direct mounting structures on the sensor chip.
2Volume of moving object
If the filter is positioned close to the image sensor chip, then the device structure is compact, but microparticles on the filter are captured by the sensor causing light spots
Solution Approach 1:
The carrier substrate provides different local qualities: a flat upper surface for stable filter support and a controllable distance gap between the filter and sensor chip. This local differentiation allows the filter to be positioned close enough for compactness while maintaining sufficient distance to prevent microparticle capture, resolving the contradiction between device compactness and image quality.
Data Source
AI summary
A portable electronic device, and an image-capturing device and an assembly method thereof are provided. The image-capturing device includes a carrier substrate, an image sensing chip, a filter element and a lens assembly. The carrier substrate has a through opening and a recessed space. The image sensing chip is disposed on the bottom side of the carrier substrate. The filter element is disposed in the recessed space of the carrier substrate, so that all or a part of the filter element is accommodated in the through opening. When at least one microparticle with a maximum particle size between 5 μm and 25 μm is located on the filter element, a shortest distance between the filter element and the image sensing chip is between 30 μm and 200 μm, so that the image sensing chip cannot capture a light spot generated due to blocking of the microparticle.