Nested Zoom Drive Actuator for Compact Long-Stroke Lens Motion
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Solution Overview
Problem
Existing zoom lens actuators for cameras in portable devices face challenges in maintaining stable driving performance over extended strokes, leading to increased actuator dimensions and complexity, which complicates their use in applications like smartphones where size is a concern.
Innovation Solution
A zoom drive actuator design featuring symmetrically opposing carriers with magnet and coil units, allowing independent movement and overlapping physical structures to enhance driving force while minimizing space, utilizing balls and guides for stable motion along the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If repetitions of physical substructure are used to secure independent movement for each carrier, then independent movement of multiple carriers is achieved, but actuator dimensions are inflated
Solution Approach 1:
The patent implements nesting by placing the second guide (135) inside the first carrier (120) and the first guide (125) inside the second carrier (130). Each guide passes through a corridor space formed by the other carrier, allowing both carriers to move independently while sharing the same physical space. This nested configuration eliminates the need for separate physical substructures for each carrier, thereby reducing overall actuator dimensions while maintaining independent movement capability.
2Length of moving object
If extended stroke is implemented for zoom lens, then variable adjustment of object size is achieved, but driving force requirements increase
Solution Approach 1:
The patent replaces traditional mechanical driving systems with electromagnetic actuators (coil units and magnet units). The first coil unit (140) and first magnet unit (124), along with the second coil unit (145) and second magnet unit (134), generate electromagnetic forces to drive the carriers along extended strokes. This substitution provides more stable and controllable driving force over extended movement distances compared to conventional mechanical systems, enabling reliable zoom functionality with variable object size adjustment.
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 design ensures stable, independent movement of lens carriers with enhanced driving force, achieving compactness and optimal space utilization, suitable for mobile terminals.
Implementation Method 1
a first coil unit (140) and a first magnet unit (124), and a second coil unit (145) and a second magnet unit (134)
Data Source
AI summary
Provided herein is a zoom drive actuator comprising a first carrier movable along an optical axis, a second carrier capable of moving anterior or posterior to the first carrier along the optical axis, a housing enclosing the first and second carriers, a first coil unit; and a second coil unit, in which the first carrier comprises a first mount equipped with a first lens assembly, a first support to which a first magnet is attached, and a first guide placed on the side of the first mount opposite to the first support, in which the second carrier comprises a second mount equipped with a second lens assembly, a second support to which a second magnet is attached, and a second guide placed on the side of the second mount opposite to the second support and in which the first coil unit faces the first magnet and the second coil unit faces the second magnet and where the first carrier comprises a first space forming a corridor to allow the second guide to make a passage through it and the second carrier comprises a second space forming a corridor to allow the first guide to make a passage through it.