Folded Imaging Lens Module With Magnetic Zoom Position Sensing
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Solution Overview
Problem
Conventional telephoto optical systems face challenges in achieving high image quality and miniaturization due to poor zooming position accuracy, failing to meet the requirements of modern electronic devices with compact size and multi-functionality.
Innovation Solution
An imaging lens module comprising at least one imaging lens unit, an optical folding component, and a sensing magnet group, where sensing magnets are disposed along the optical axis to ensure accurate positioning and flux density, coupled with a driving coil and hall sensing component group for precise lens movement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional telephoto optical systems are designed with long focal length, then image quality can be improved, but device size increases and zooming position accuracy deteriorates
Solution Approach 1:
The patent introduces a magnetic scale positioned at a specific distance from the lens group, creating a spatial reference dimension that enables accurate position detection without increasing the optical path length. The magnetic scale's arrangement in a plane perpendicular to the optical axis allows for precise zooming position measurement while maintaining compact device dimensions.
Solution Approach 2:
The patent employs a magnetic scale as an intermediary reference element between the lens group and the detection system. This magnetic scale, with its specific magnetic pole arrangement, serves as a mediator that enables accurate position sensing through magnetic field interaction, resolving the contradiction between measurement precision and device size.
2Measurement precision
If multiple sensing magnets are disposed along the optical axis, then zooming position accuracy is improved, but flux density uniformity becomes challenging
Solution Approach 1:
The patent applies local quality by arranging magnetic poles with alternating polarity (N-S-N-S sequence) on the sensing magnets. This local alternation of magnetic properties creates a magnetic field distribution that maintains uniformity across the sensing region, enabling accurate position detection while preserving flux density stability.
Solution Approach 2:
The patent utilizes asymmetric positioning of magnetic poles relative to the optical axis, with each sensing magnet having poles arranged at specific offsets. This asymmetric configuration, combined with the alternating polarity sequence, creates a magnetic field pattern that maintains uniformity along the optical axis while enabling precise position sensing.
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 enhances zooming position accuracy, ensuring high image quality and miniaturization, while maintaining efficient flux density and sensing accuracy, suitable for high-end electronic devices.
Implementation Method 1
The sensing magnet group includes at least two sensing magnets that are sequentially disposed on the at least one plastic lens barrel along a direction in parallel with the optical axis
Implementation Method 2
coupled with a driving coil and hall sensing component group for precise lens movement and stabilization
Implementation Method 3
coupled with a driving coil and hall sensing component group for precise lens movement and stabilization
Data Source
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AI summary
An imaging lens module (1) includes an imaging lens unit (13), an optical folding component (15) and a sensing magnet group (16). The imaging lens unit (13) has an optical axis (OA). The optical folding component (15) is configured to fold an incident optical path (IOP) into the imaging lens unit (13) to coincide with the optical axis (OA). The sensing magnet group (16) includes two sensing magnets (161, 162) that are sequentially disposed on the imaging lens unit (13) along a direction in parallel with the optical axis (OA). The sensing magnets (161, 162) are located at the same side with respect to a reference plane that passes through the optical axis (OA) and has a normal direction perpendicular to the optical axis (OA). When the sensing magnets (161, 162) are observed from the direction in parallel with the optical axis (OA), images of the sensing magnets (161, 162) are at least partially overlapped. Two adjacent magnetic poles of the sensing magnets (161, 162) are like poles between which there is a repulsive force.