Imaging Lens Compact Design for Wide Temperature Range
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Solution Overview
Problem
Existing imaging lenses for surveillance and onboard cameras face challenges in achieving a compact size and weight while maintaining good optical performance, particularly in wide temperature ranges and varying weather conditions, and require a small exposed lens diameter to fit seamlessly into vehicle exteriors.
Innovation Solution
The design of an imaging lens system comprising four groups: a first lens group with positive power, a second lens group with a concave object-side surface, a third lens group as a single positive power lens, and a fourth lens group with negative power, optimized by specific conditional expressions to correct field curvature and spherical aberration, and featuring a cemented lens configuration for chromatic aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aperture diaphragm is disposed closer to the image side than the third lens group, then the optical performance is improved, but the lens diameter becomes large
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the aperture diaphragm on the object side of the third lens group rather than on the image side. This inversion allows the lens to achieve a small diameter while maintaining optical performance, directly resolving the technical contradiction between lens size and optical quality
2Area of stationary object
If the lens diameter is reduced for compact applications, then the size and weight are decreased, but the optical performance may deteriorate
Solution Approach 1:
The patent employs specific parameter ranges for lens focal lengths, distances between lens groups, and aperture diaphragm positioning to optimize the balance between compact size and optical performance. By carefully controlling these parameters, the lens achieves small diameter while maintaining excellent optical characteristics including corrected aberrations and sufficient light gathering capability
3Adaptability or versatility
If the lens is designed for wide wavelength range from visible to infrared band, then the versatility is improved, but the complexity of aberration correction increases
Solution Approach 1:
The patent uses a cemented lens structure combining different glass materials with complementary dispersion properties to correct chromatic aberrations across the wide wavelength range. This composite approach allows effective aberration correction without significantly increasing system complexity, enabling the lens to handle both visible and infrared wavelengths effectively
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 allows for a significant reduction in lens diameter and weight while maintaining excellent optical performance, enabling the lens to operate effectively across a wide temperature range and correct various aberrations, thus suitable for compact camera applications.
Implementation Method 1
a first lens group having a positive power as a whole; a second lens group, in which an object-side surface of a lens closest to the object side is concave toward the object side; a third lens group of a single lens having a positive power; and a fourth lens group having a negative power as a whole
Data Source
AI summary
An imaging lens is provided and includes: in order from an object side of the imaging lens, a first lens group having a positive power as a whole; a second lens group, in which an object-side surface of a lens closest to the object side is concave toward the object side; a third lens group of a single lens having a positive power; and a fourth lens group having a negative power as a whole.