Telephoto Lens with Segmented Assemblies for Interchangeable Design
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Solution Overview
Problem
Existing telephoto lenses with an entrance pupil of 80-110 mm face challenges in achieving accurate focusing without mechanical tilting or axial run-out, making them difficult and costly to design, especially when trying to create kit systems with interchangeable optical components.
Innovation Solution
A compact telephoto lens design with a lens head and focusing component, utilizing a refractive power sequence that alternates in the light direction, incorporating two optically transparent plane plates for mechanical separability and protection, and employing lens elements with anomalous partial dispersion to minimize aberrations and manufacturing tolerances, allowing for cost-effective and sensitive optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a telephoto lens with an entrance pupil of 80-110 mm is designed with high precision focusing guidance to avoid imaging aberrations, then imaging quality is improved, but manufacturing cost and mechanical complexity increase significantly
Solution Approach 1:
The optical system is divided into two separate assemblies: a lens head assembly and a focusing assembly. This segmentation allows each assembly to be optimized independently, with the focusing assembly containing the precision guidance mechanisms while the lens head can be simpler in structure.
Solution Approach 2:
A plane plate is introduced as an intermediary element between the lens head and focusing assembly. This plane plate serves as a mechanical interface that simplifies the connection and guidance requirements, reducing the overall mechanical complexity while maintaining imaging quality.
2Adaptability or versatility
If kit systems with interchangeable optical components are implemented, then adaptability is improved, but mechanical tolerances and manufacturing costs worsen
Solution Approach 1:
The optical system is segmented into interchangeable assemblies (lens head and focusing assembly), allowing different lens heads to be mounted on a standardized focusing assembly. This enables kit systems with multiple focal lengths while maintaining consistent mechanical tolerances through the standardized interface.
Solution Approach 2:
The focusing assembly is designed as a universal platform that can accommodate different lens head assemblies with various focal lengths and aperture characteristics. The standardized mechanical interface and guidance system provide adaptability across multiple optical configurations.
3Manufacturing precision
If the number of lens elements in the lens head is increased to correct imaging aberrations, then imaging quality is improved, but the number of optical components and manufacturing cost increase
Solution Approach 1:
The plane plate acts as an intermediary that enables effective aberration correction with fewer lens elements by optimizing the optical path and reducing the need for additional corrective elements in the lens head assembly.
Solution Approach 2:
The refractive power sequence of the lens elements is optimized with alternating positive and negative powers, and the plane plate introduces parameter changes in the optical path that reduce spherical and chromatic aberrations without requiring additional lens elements.
4Ease of manufacture
If mechanical installation space is increased to relax manufacturing tolerances, then ease of manufacture is improved, but the overall lens size and volume increase
Solution Approach 1:
The optical assemblies are compactly arranged with the plane plate positioned to optimize space utilization. The lens head and focusing assembly are nested in a compact configuration that minimizes overall volume while providing sufficient space for the precision guidance mechanisms.
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 a compact, cost-effective optical system with reduced sensitivity to mechanical tolerances, achieving improved optical imaging performance and allowing for interchangeable lens heads with minimal image aberrations, thus overcoming the challenges of high manufacturing costs and mechanical complexity.
Implementation Method 1
two optically transparent plane plates which are perpendicular to the optical axis are introduced into the imaging ray path between the lens head and the focusing component for mechanical separability, while at the same time protecting the interior of the two optical assemblies from ambient influences (dust, moisture)
Implementation Method 2
employing lens elements with anomalous partial dispersion to minimize aberrations and manufacturing tolerances
Implementation Method 3
the second optical assembly is displaced along an optical axis in order to image the object image captured by the lens head in focus, i.e., sharply, and with magnification into an image plane disposed at the end of an optical imaging chain
Data Source
AI summary
A telephoto lens having an entrance pupil of between 80 and 110 mm includes a lens head and a focusing component. The lens head, as a first optical assembly, consists of four lens elements with a refractive power sequence that alternates in the light direction. The focusing component is a second optical assembly made of at least two lens elements and has a relative aperture of between 1:4.5 and 1:7.