Wide-Angle Imaging Lens Layout for Short Optical Length
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Solution Overview
Problem
There is a demand for an imaging lens with a small size and favorable optical performance, which existing technologies have not adequately addressed.
Innovation Solution
The imaging lens is designed with a specific configuration comprising a front group and a rear group, including at least five negative lenses and three positive lenses, with certain lenses having defined surface orientations and refractive powers, and adhering to specific conditional expressions to ensure compact size and high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional lens configuration is used, then the lens can achieve a certain focal length, but the overall system length becomes too long for compact imaging apparatuses
Solution Approach 1:
The patent employs a nested lens structure where multiple lens groups are arranged in a compact configuration. The front group, stop, and rear group are positioned to overlap spatially, allowing the light rays to pass through multiple optical elements within a shortened axial distance. This nesting approach enables achieving the required optical path length while maintaining a compact overall system length suitable for mobile imaging apparatuses.
2Reliability
If the number of lenses is increased to achieve wide angle of view and suppress aberrations, then optical performance improves, but the lens size and complexity increase
Solution Approach 1:
The patent divides the lens system into distinct functional groups: a front group containing multiple negative and positive lenses for wide angle of view and aberration correction, a stop for aperture control, and a rear group with specific refractive power for image formation. Each group is optimized independently with specific lens arrangements (e.g., negative-positive-negative sequences) to address particular optical requirements, allowing complex optical performance to be achieved through modular design rather than a monolithic complex structure.
Solution Approach 2:
Different regions of the lens system are assigned specific optical properties tailored to their functional requirements. The front group uses a combination of negative and positive lenses with specific curvature and refractive index values to correct spherical and chromatic aberrations at the object side. The rear group employs lenses with controlled refractive powers to maintain image quality at the image plane. This local optimization of optical properties enables high overall performance without uniformly increasing complexity throughout the entire system.
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 lens achieves a wide angle of view while maintaining optical quality, suppressing various aberrations, and reducing the overall system length, making it suitable for compact imaging apparatuses.
Implementation Method 1
an imaging lens consisting of, in order from an object side to an image side: a front group; a stop; and a rear group that has a refractive power
Data Source
AI summary
An imaging lens consisting of, in order from an object side to an image side: a front group; a stop; and a rear group that has a refractive power, wherein: the front group and the rear group are combined and include at least five negative lenses and at least three positive lenses, a lens closest to the object side in the front group is a first lens as a negative meniscus lens which has a convex surface facing toward the object side, a lens, which is second from the object side in the front group, is a second lens as a negative lens which has a concave surface facing toward the image side, and the front group includes at least three negative lenses, which include the first lens and the second lens, and at least one positive lens. The imaging lens satisfies predetermined conditional expressions.