Five-Lens Optical System with Glass-Plastic Composite for Temperature Stability
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Solution Overview
Problem
Miniaturization and lightweight trends in mobile communications terminals pose challenges in achieving high-resolution camera modules with high performance, as they face limitations in maintaining resolution and modulation transfer function performance across temperature changes and focusing positions.
Innovation Solution
An optical system comprising five or more lenses, where the first lens is formed of glass and subsequent lenses of plastic, with specific refractive powers and aspherical surfaces, configured to maintain modulation transfer function performance and reduce aberrations across temperature changes, while providing a wide field of view and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If camera modules are miniaturized and lightened, then mobile communications terminals can be made smaller and lighter, but resolution and performance deteriorate
Solution Approach 1:
The patent employs a composite lens structure where the first lens is made of glass material and the second through fifth lenses are made of plastic material. This composite approach allows the optical system to achieve high resolution equivalent to glass lenses while maintaining the lightweight and compact advantages of plastic lenses, thereby resolving the contradiction between miniaturization and resolution maintenance.
2Weight of moving object
If camera modules are miniaturized and lightened, then mobile communications terminals can be made smaller and lighter, but performance deteriorates
Solution Approach 1:
The patent employs a composite lens structure where the first lens is made of glass material and the second through fifth lenses are made of plastic material. This composite approach allows the optical system to achieve high resolution equivalent to glass lenses while maintaining the lightweight and compact advantages of plastic lenses, thereby resolving the contradiction between miniaturization and resolution maintenance.
3Temperature
If temperature changes occur, then environmental adaptability is tested, but resolution deteriorates and focusing positions shift
Solution Approach 1:
The patent specifies precise parameter ranges for the lenses including refractive indices (n1: 1.50-1.70, n2: 1.40-1.60, n3: 1.40-1.60, n4: 1.40-1.60, n5: 1.40-1.60), Abbe numbers (v1: 30-50, v2: 20-40, v3: 20-40, v4: 20-40, v5: 20-40), and focal length ratios (0.25 < f1/f3 < 0.75, 0.20 < f4/f5 < 0.50). These controlled parameter changes ensure that the optical system maintains stable resolution and focusing positions across temperature variations.
4Measurement precision
If more lenses are added to achieve high resolution, then resolution improves, but device complexity increases
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific functional assignments: the first glass lens provides primary focusing and chromatic aberration correction, while the subsequent four plastic lenses handle additional aberration correction and focus adjustment. This segmentation allows high resolution to be achieved through coordinated function of multiple specialized components rather than a single complex element.
Solution Approach 2:
The patent employs a composite lens structure where the first lens is made of glass material and the second through fifth lenses are made of plastic material. This composite approach allows the optical system to achieve high resolution equivalent to glass lenses while maintaining the lightweight and compact advantages of plastic lenses, thereby resolving the contradiction between miniaturization and resolution maintenance.
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 optical system effectively decreases resolution deterioration at high and low temperatures, maintains MTF performance, and reduces focusing position changes, achieving improved aberration correction and high-resolution imaging.
Implementation Method 1
a first lens having positive refractive power and comprising an object-side surface which is convex in a paraxial region
Implementation Method 2
a second lens having negative refractive power and comprising an object-side surface which is convex in a paraxial region
Implementation Method 3
a third lens having positive refractive power
Data Source
AI summary
An optical system includes: a first lens having refractive power and comprising an object-side surface which is convex in a paraxial region; a second lens having refractive power and comprising an object-side surface which is convex in the paraxial region; a third lens having refractive power; a fourth lens having refractive power; and a fifth lens having refractive power. The first to fifth lenses are sequentially disposed from an object side. An Abbe number of the first lens is between 30 and 50. Deteriorations in resolution at high temperatures and/or low temperatures may be decreased, MTF performance may be maintained even during temperature changes, and changes in focusing positions may be decreased. In addition, an aberration improvement effect, a wide field of view and a high degree of resolution may be implemented.