Plastic Image Sensor Package with Infrared-Transmissive Additives
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image sensor packages made of metal, ceramic, or glass are costly and require complex vacuum maintenance to reduce heat transmission, limiting their cost-effectiveness and manufacturing simplicity while ensuring decent light transmittance.
Innovation Solution
An image sensor package using a plastic packaging structure with a transparent plastic window containing additives like germanium, silicon, or zinc compounds, which allows for non-vacuum conditions and improved thermal insulation, reducing material costs and manufacturing complexity while maintaining sufficient light transmittance in the far infrared region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal or ceramic packaging materials are used, then thermal insulation performance is improved, but material cost and manufacturing complexity increase
Solution Approach 1:
The patent uses composite materials consisting of plastic matrix combined with infrared-transmissive additives (such as germanium, silicon, or zinc selenide particles) to create a window material that provides both thermal insulation and infrared light transmission. This composite approach allows achieving the thermal performance of metal/ceramic while maintaining the manufacturing ease of plastic packaging.
2Temperature
If vacuum conditions are maintained inside the package, then heat transmission through convection is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the vacuum requirement from the packaging system by using plastic packaging material with inherent thermal insulation properties and infrared-transmissive windows. This eliminates the need to maintain vacuum conditions inside the package, thereby removing the complexity of vacuum sealing, monitoring, and maintenance systems while still achieving effective heat transmission control.
3Illumination intensity
If glass windows are used for light penetration, then light transmittance is improved, but material cost increases
Solution Approach 1:
The patent changes the material parameters by using plastic instead of glass as the base material for the packaging window, and incorporates infrared-transmissive additives to enhance light transmission properties. This parameter change allows achieving sufficient light transmittance for infrared imaging while using lower-cost plastic materials that are easier to manufacture and process compared to glass.
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 plastic with additives in the image sensor package achieves low costs, simplified manufacturing, and high light transmittance in the far infrared region, eliminating the need for vacuum conditions and special gases, thus reducing packaging complexity and costs.
Implementation Method 1
a transparent plastic window disposed in the plastic packaging structure, wherein a material of the transparent plastic window includes a plastic and an additive... maintaining sufficient light transmittance in the far infrared region
Implementation Method 2
improved thermal insulation, reducing material costs and manufacturing complexity while maintaining sufficient light transmittance... reduce heat transmission affecting the image sensor through contact conduction and air convection
Data Source
AI summary
An image sensor package includes a plastic packaging structure; and a transparent plastic window disposed in the plastic packaging structure, wherein material of the transparent plastic window includes plastic and an additive, and the additive is selected from the group consisting of germanium, silicon, potassium bromide, potassium chloride, sodium chloride, zinc sulfide, and zinc selenide.