Folded Lens Assembly for Chromatic Aberration Correction
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Solution Overview
Problem
In miniaturized electronic devices, it is challenging to maintain optical performance while ensuring design flexibility and correcting chromatic aberration, particularly when incorporating additional optical members like mirrors or prisms.
Innovation Solution
An imaging device with a lens assembly comprising at least four lenses and an optical member that reflects light to intersect the optical axis, adhering to specific refractive power and Abbe number conditions to correct chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional optical members like mirrors or prisms are incorporated to correct chromatic aberration, then chromatic aberration correction is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated lens assembly. The lens assembly includes lenses with different refractive powers and Abbe numbers arranged in sequence, where the fourth lens specifically corrects chromatic aberration while the optical member guides light to intersect the optical axis. This merging approach achieves chromatic aberration correction without adding separate mirrors or prisms, thereby reducing device complexity while maintaining correction effectiveness
2Reliability
If lens parameters are optimized for chromatic aberration correction, then optical performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the lenses to achieve chromatic aberration correction while maintaining manufacturability. The conditional expressions define specific ranges for focal lengths (f1, f2, f3, f4), Abbe numbers (V1, V2, V3, V4), and refractive powers that balance optical performance with manufacturing feasibility. By optimizing these parameters within defined ranges, the patent achieves effective chromatic aberration correction without imposing excessively stringent manufacturing precision requirements
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 solution enables improved chromatic aberration correction and maintains design flexibility suitable for miniaturized electronic devices, enhancing optical performance.
Implementation Method 1
an optical member configured to guide light, which is focused or guided by the lens assembly, in a direction intersecting the optical axis by reflecting the light at least once
Implementation Method 2
a lens assembly including at least four lenses sequentially arranged along an optical axis... a first lens disposed first in an incident direction of light and having a positive refractive power, a second lens disposed second in the incident direction of light and having a positive refractive power
Data Source
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AI summary
An imaging device, according to one embodiment of the present disclosure, includes: a lens assembly comprising at least four lenses sequentially arranged in the optical axis direction, the at least four lenses including a first lens disposed first in the incident direction of light and having positive refractive power, a second lens disposed second in the incident direction of light and having positive refractive power, a third lens disposed third in the incident direction of light, and a fourth lens disposed fourth in the incident direction of light; and an optical member configured to reflect, at least once, the light focused or guided by the lens assembly, so as to guide the light in a direction crossing the optical axis, and satisfies the conditions presented in the disclosed embodiment(s). Other various embodiments may also be possible.