Compact Imaging Lens Assembly with Triangular Prism
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Solution Overview
Problem
Conventional imaging lens assemblies have a long mechanical length due to their complex structure, making them unsuitable for small-size imaging apparatuses.
Innovation Solution
A compact imaging lens assembly configuration with a front fixing unit, a triangular prism, a magnification unit, a compensation unit, and an object lens unit, where the lenses and prism are arranged to allow continuous zooming with a fixed optical length, utilizing specific lens types and a triangular prism to control aberrations and optimize F-numbers, refractive indices, and focal lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional imaging lens assembly with front fixing unit, magnification unit, compensation unit and back fixing unit is used, then the imaging function is achieved, but the mechanical length becomes long
Solution Approach 1:
The patent combines the front fixing unit, magnification unit, and compensation unit into a single integrated lens assembly structure. The front fixing unit includes first and second lenses, the magnification unit includes third and fourth lenses, and the compensation unit includes fifth and sixth lenses, all merged into one continuous optical path without separate housing units, thereby reducing overall mechanical length while maintaining imaging functionality.
Solution Approach 2:
The patent employs a nested arrangement where the aperture stop is positioned between the second and third lenses, and the optical axis passes through multiple lens centers in sequence. This nested configuration allows compact packaging of multiple optical elements within a shortened mechanical envelope, achieving reduced mechanical length while preserving the imaging function.
2Adaptability or versatility
If lenses are arranged for continuous zooming with fixed optical length, then the imaging range is expanded, but the structural complexity increases
Solution Approach 1:
The patent implements continuous zooming capability by allowing the lens elements to move dynamically along the optical axis while maintaining fixed optical length. The magnification unit and compensation unit can adjust their positions relative to each other, enabling focal length variation from wide-angle to telephoto without changing the overall mechanical length, thus expanding imaging range through dynamic positioning.
Solution Approach 2:
The patent achieves expanded imaging range by changing optical parameters such as focal length, F-number, and magnification through the relative movement of lens elements. The front fixing unit, magnification unit, and compensation unit work together to vary these parameters continuously while maintaining a fixed optical length, allowing adaptation to different imaging scenarios without increasing structural complexity.
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, stable, and high-performance imaging lens assembly with improved imaging performance, expanded imaging range, and reduced chromatic aberration, suitable for small-size imaging devices.
Implementation Method 1
the triangular prism TP is configured for changing a light transmitting direction in the image lens assembly
Implementation Method 2
an imaging lens assembly for performing imaging function
Data Source
AI summary
An imaging lens assembly is provided in the present disclosure. The imaging lens assembly includes a front fixing unit with a first lens, a triangular prism, a magnification unit with a second lens, an aperture stop, a compensation unit with a third lens and a fourth lens, and an object lens unit with a fifth lens, which are arranged in that order along an light incident direction. The triangular prism is configured for changing a light transmitting direction, the magnification unit and the compensation unit are configured for performing continuous focal length switching, and the object lens unit is configured for performing focusing in different distance conditions. The first lens is a meniscus convex lens, the second lens is a biconvex positive lens, the third lens is a biconcave lens, the fourth lens is a meniscus convex lens, and the fifth lens is a biconvex lens.