Six-Lens Optical System with Aperture Stop for Wide Angle and Compact Length
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Solution Overview
Problem
Existing optical systems for image pickup apparatuses face challenges in achieving a balance between reduced size, wide angle of view, and high optical performance, while also ensuring lens molding stability and correcting aberrations such as coma and spherical aberration.
Innovation Solution
The optical system comprises a sequence of six lenses with a specific arrangement and an aperture stop between the first and second lenses, adhering to certain inequalities that optimize the radius of curvature, focal lengths, and distances between lenses to improve optical performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical system uses a compact lens configuration to reduce size, then the overall length is reduced, but the angle of view becomes narrower and optical performance deteriorates
Solution Approach 1:
The optical system is divided into six separate lenses (first lens through sixth lens) with specific arrangements and focal lengths. Each lens contributes to a particular function: the first lens provides wide angle coverage, subsequent lenses correct aberrations and extend the effective focal length, and the sixth lens provides telephoto characteristics. This segmentation allows the system to achieve both compact size and wide angle of view by distributing optical functions across multiple elements rather than relying on a single large lens.
Solution Approach 2:
The patent transitions from a simple single-lens system to a multi-lens system that utilizes the spatial arrangement of multiple optical elements along the optical axis. By adding the dimension of multiple lenses with different focal lengths and positions, the system achieves telephoto characteristics and wide angle of view simultaneously, effectively solving the contradiction between compact size and angular coverage.
2Length of moving object
If the optical system uses a compact lens configuration to reduce size, then the overall length is reduced, but optical performance and aberration correction deteriorate
Solution Approach 1:
Each lens in the sequence is designed with specific local optical characteristics: the first lens has a focal length of 1.0-2.0 times that of the second lens to provide wide angle coverage, the second lens has a focal length of 0.5-1.5 times that of the third lens for telephoto characteristics, and subsequent lenses are optimized for their specific positions. This local optimization of each lens' focal length and position allows the compact system to maintain high optical performance and correct aberrations effectively.
Solution Approach 2:
The patent systematically varies key parameters including the focal lengths of individual lenses (with specific ratios between adjacent lenses), the positions of lenses along the optical axis, and the aperture stop position. By changing these parameters within specific ranges, the system achieves compact overall length while maintaining excellent optical performance and aberration correction capabilities.
3Length of moving object
If the optical system uses a compact lens configuration, then the overall length is reduced, but lens molding stability and manufacturing precision deteriorate
Solution Approach 1:
The patent design stage includes preliminary optimization of the lens configuration parameters, including pre-calculating the focal lengths, positions, and curvature radii of each lens to satisfy specific inequalities that ensure molding stability. By performing these optimizations in advance during the design phase, the system achieves compact size while ensuring that subsequent manufacturing processes can be performed with high precision and stability.
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 results in an optical system with reduced size, a wide angle of view, and high optical performance, while maintaining lens molding stability and effectively correcting aberrations.
Implementation Method 1
a plurality of lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side
Implementation Method 2
an aperture stop disposed between the first lens and the second lens
Data Source
AI summary
An optical system includes a plurality of lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side, and an aperture stop disposed between the first lens and the second lens. Predetermined inequalities are satisfied.