Wide Angle Optical System Lens Configuration
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Solution Overview
Problem
Wide angle optical systems face challenges in achieving compactness and low cost while maintaining good optical performance due to high manufacturing error sensitivity and productivity issues caused by high optical powers of lenses, especially in ultra-wide angle applications.
Innovation Solution
A wide angle optical system configuration comprising a sequence of negative and positive lenses with specific focal length relationships and materials, such as glass and resin, to reduce optical power and manufacturing error sensitivity, including a glass lens on the object side for durability and resin lenses with aspherical surfaces for aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the optical system is made compact in size, then the imaging angle of field is widened, but the optical powers of the lenses become high leading to high manufacturing error sensitivity
Solution Approach 1:
The optical system is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different optical powers arranged in sequence. By segmenting the optical function across multiple elements rather than relying on a single high-power lens, the system achieves wide field of view while keeping individual lens powers manageable, thus reducing manufacturing error sensitivity.
Solution Approach 2:
The patent specifies precise parameter relationships between the focal lengths of different lenses (f1, f2, f3, f4) and their positions. By optimizing these parameters within specific ranges, the system achieves compactness while controlling optical powers to acceptable levels, thereby reducing sensitivity to manufacturing errors.
2Area of moving object
If the optical powers of the lenses are increased to achieve compactness, then the imaging angle of field is widened, but the productivity decreases due to high manufacturing error sensitivity
Solution Approach 1:
By dividing the optical system into multiple lens elements with distributed optical powers, the patent reduces the power concentration in any single lens. This segmentation allows for more tolerant manufacturing processes and higher productivity while maintaining the desired wide field of view.
Solution Approach 2:
The patent establishes specific parameter ranges for focal lengths and lens positions that optimize the balance between compactness and manufacturability. By keeping optical powers within certain limits through parameter optimization, the system achieves both compact size and high productivity.
3Area of moving object
If the optical power of the positive lens is increased to achieve compactness, then the imaging angle of field is widened, but the cost increases due to high manufacturing error sensitivity
Solution Approach 1:
The optical system segments the positive optical power across multiple lens elements (third lens with positive power, fourth lens with positive power) rather than concentrating it in a single high-power lens. This distribution reduces manufacturing error sensitivity and associated costs while maintaining compactness and wide field of view.
Solution Approach 2:
The patent specifies parameter relationships that control the optical power of positive lenses within ranges that balance performance and cost. By optimizing these parameters, the system achieves compactness without excessive manufacturing complexity or cost.
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 enables a compact, low-cost wide angle optical system with improved productivity and optical performance by distributing optical power effectively and correcting aberrations, thereby enhancing the manufacturing process and image quality.
Implementation Method 1
a first lens having a negative optical power, a second lens having a negative optical power
Implementation Method 2
a third lens having a positive optical power, an aperture, and a fourth lens having a positive optical power
Implementation Method 3
an aperture
Data Source
AI summary
Provided are a wide angle optical system having better optical performance, low in cost, and compact in size, an imaging lens device having the wide angle optical system, a monitor camera, and a digital apparatus. The wide angle optical system (1) has, in order from the object side to the image side, a first lens (11) having a negative optical power, a second lens (12) having a negative optical power, a third lens (13) having a positive optical power, an aperture (15), and a fourth lens (14) having a positive optical power. The wide angle optical system satisfies the conditional expression of 3<f34/f<10, where f34 is the composite focal length of the third and fourth lenses (13, 14) and f is the focal length of the entire system.