Six-Lens Telescopic Optics for Compact Long-Distance Imaging
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Solution Overview
Problem
Telescopic optical imaging systems are typically large and difficult to integrate into small electronic devices due to their high total length to focal length ratio, limiting their application in portable terminals.
Innovation Solution
A telescopic optical imaging system comprising six lenses with specific refractive powers and surface configurations, including aspherical surfaces, is designed to satisfy conditional expressions that enhance miniaturization and imaging performance, allowing integration into small-sized terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telescopic optical imaging system is designed with traditional lens configurations, then long-distance imaging capability is achieved, but the total length of the optical system becomes excessively large (TL/f ratio of 1 or more)
Solution Approach 1:
The optical system is divided into six distinct lens groups with specific refractive power assignments (positive, negative, negative, positive, negative, positive). Each lens group contributes differently to the overall optical function, allowing the system to achieve telescopic imaging capability while reducing the total length through optimized segmentation of optical functions across multiple elements.
Solution Approach 2:
The patent applies specific conditional expressions that constrain key parameters: 0.7 < |f1/f| < 1.3 for the first lens focal length ratio, −3.5 < f2/f < −2.5 for the second lens focal length ratio, and 1.60 < Nd6 < 1.75 for the sixth lens refractive index. These parameter constraints optimize the TL/f ratio while maintaining long-distance imaging performance, enabling compact telescopic system design.
2Length of stationary object
If the optical system is miniaturized to fit in portable terminals, then the total length is reduced, but imaging performance and resolution may deteriorate
Solution Approach 1:
Different lens elements are assigned specific surface configurations (convex or concave object-side and image-side surfaces) and refractive power signs to optimize local optical functions. The sixth lens specifically has a convex image-side surface to control light convergence at the image plane. This localized optimization of each lens element's properties maintains high imaging performance despite the compact overall system size.
Solution Approach 2:
The system uses lenses with different refractive indices, particularly specifying Nd6 > 1.60 for the sixth lens, indicating high-refractive-index materials are employed in critical positions. This allows stronger light control in smaller optical paths, maintaining imaging quality while reducing system length.
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 system achieves long-distance imaging while maintaining a compact size, satisfying conditional expressions for miniaturization and high-resolution imaging, suitable for mounting in portable terminals.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens having a positive refractive power
Data Source
AI summary
An optical imaging system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens having a positive refractive power and having a convex image-side shape, sequentially arranged in a direction from an object side of the optical imaging system to an imaging plane of the optical imaging system.