Infrared Lens Module Thermal Compensation
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Solution Overview
Problem
Conventional infrared ray-tracing lens modules experience decreased image quality due to lens deformation caused by temperature variations, which affects the viewing angle and resolution.
Innovation Solution
The infrared ray-tracing lens module incorporates a specific arrangement of positive and negative diopter lenses with convex and concave surfaces, along with an aperture and color filter, to compensate for temperature-induced dimensional changes, maintaining image quality and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional glass or plastic lenses are used to improve image quality, then image quality is improved, but lens deformation occurs due to temperature variations causing resolution to decrease
Solution Approach 1:
The patent applies parameter changes by utilizing the thermal expansion characteristics of different materials. The lens system comprises a plastic lens and a glass lens with different thermal expansion coefficients, arranged to compensate for each other's dimensional changes under temperature variations, thereby maintaining stable optical performance and resolution
Solution Approach 2:
The patent employs composite materials by combining plastic and glass lenses in a single optical system. Each material contributes its advantageous properties: plastic lenses provide lightweight construction and design flexibility, while glass lenses offer thermal stability. The composite structure compensates for individual material limitations, achieving both image quality and temperature stability
2Temperature
If lens dimensions are allowed to vary with temperature, then thermal expansion is natural, but viewing angle and resolution deteriorate
Solution Approach 1:
The patent directly applies thermal expansion principles by designing a lens system where the plastic lens expands more than the glass lens under temperature increase. This differential expansion is calculated and arranged so that the optical power changes compensate for each other, maintaining stable focal length and viewing angle across temperature ranges
Solution Approach 2:
The patent uses the counterweight principle optically by positioning the plastic lens and glass lens such that their opposing thermal expansion effects balance each other. The plastic lens's greater expansion is compensated by the glass lens's smaller expansion, creating a net stable optical system against temperature-induced dimensional changes
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 design enhances the auto temperature compensation function, stabilizing the lens dimensions and improving the resolution and viewing angle range of the infrared ray-tracing lens module, ensuring consistent image quality across temperature variations.
Implementation Method 1
The first positive diopter lens includes a first lens surface and a second lens surface, wherein the first lens surface is opposite to the second lens surface, the first lens surface is a convex surface, and the second lens surface is a concave surface
Data Source
AI summary
An infrared ray-tracing lens module is provided. The infrared ray-tracing lens module is adapted to receive light from an object. The infrared ray-tracing lens module includes a first positive diopter lens, a second positive diopter lens, a negative diopter lens and an image unit. The first positive diopter lens, the second positive diopter lens and the negative diopter lens are arranged along an optical axis, and the light travels from the object, sequentially passes through the first positive diopter lens, the second positive diopter lens and the negative diopter lens to be projected to the image unit.