Infrared Sensor Spacer Design for Off-Axis Aberration Control
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Solution Overview
Problem
Infrared sensors face degradation in detection precision due to off-axis aberration when detecting infrared light from off-axis object points.
Innovation Solution
The infrared sensor design includes a lens, a member with a first opening, a gap, and a spacer with a circular inner periphery larger than the opening, positioned between the member and the lens to suppress off-axis aberration by shifting the infrared transmission region and reducing the incident angle on the lens surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional lens is used to detect infrared light, then the detection structure is simple, but off-axis aberration occurs when detecting off-axis object points, degrading detection precision
Solution Approach 1:
The patent divides the lens into multiple segments: a main lens and a sub-lens positioned at an off-axis location. Each lens segment has specific optical parameters designed to handle different portions of the infrared light, thereby reducing off-axis aberration while maintaining overall system functionality
Solution Approach 2:
The sub-lens is positioned at a specific off-axis location and has different optical parameters compared to the main lens. This local differentiation allows the optical system to optimize performance for off-axis object points without compromising the entire lens structure
2Volume of moving object
If the lens is positioned close to the infrared detecting device, then the device structure is compact, but off-axis aberration increases, reducing resolution for off-axis light
Solution Approach 1:
Instead of simply increasing the distance between the lens and detecting device along the optical axis, the patent introduces a sub-lens positioned at an off-axis location (lateral dimension). This dimensional approach allows the system to maintain compact overall size while improving off-axis light resolution through the sub-lens's specific optical parameters
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
This configuration improves the resolution for off-axis light and reduces off-axis aberration, enhancing the detection precision and sensitivity of the infrared sensor.
Implementation Method 1
The spacer is disposed between the member and the lens so as to form the gap, and is directly contact with lens. The spacer has a circular inner periphery in planar view. The circular inner periphery has a larger internal diameter than the maximum internal diameter of the first opening of the member.
Data Source
AI summary
An infrared sensor includes an infrared detecting device, a lens, a member, a gap and a spacer. The lens is disposed above the infrared detecting device. The member forms an external surface and includes a first opening having a maximum internal diameter. The gap is disposed between the member and the lens. The spacer is disposed between the member and the lens so as to form the gap, and that is directly contact with lens. The spacer has a circular inner periphery, in planar view, which has a larger internal diameter than the maximum internal diameter of the first opening of the member.