Zoom Lens Control Architecture for Precise Focus and Extended Zoom Travel
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Solution Overview
Problem
Current zoom lenses face challenges in achieving both high precision focusing and large moving distance range during zooming due to the limited number of effective control bits in driving chips, which restricts the overall moving distance of lens groups during optical image stabilization.
Innovation Solution
A zoom lens design with multiple lens assemblies and a driving chip that includes control ends to manage different focal lengths, allowing for precise control of lens movements for zooming and focusing, with a driving chip allocating control bits efficiently to ensure high precision during focusing and a larger moving distance range during zooming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a driving chip with limited effective control bits is used to control lens group movement, then the control precision for focusing is improved, but the overall moving distance range for zooming is reduced
Solution Approach 1:
The patent divides the lens system into multiple lens groups (first lens group, second lens group, third lens group) with different functions. The first lens group is dedicated to zooming operations, the second lens group to focusing operations, and the third lens group to optical image stabilization. This segmentation allows each lens group to be controlled independently with appropriate control bit allocation, resolving the contradiction between focusing precision and zooming range.
Solution Approach 2:
The patent implements dynamic control bit allocation where the driving chip adjusts the number of effective control bits used for each lens group based on the current operational mode (zooming, focusing, or optical image stabilization). During zooming operations, more control bits are allocated to the first lens group for larger movement range, while during focusing, more bits are allocated to the second lens group for higher precision, thus dynamically resolving the resource allocation contradiction.
2Length of moving object
If the moving distance range of lens groups is increased for zooming, then the zoom capability is improved, but the focusing precision is reduced due to limited control bits
Solution Approach 1:
The patent separates zooming and focusing functions into different lens groups (first lens group for zooming, second lens group for focusing), allowing independent optimization of movement range and precision for each function without compromising the other.
Solution Approach 2:
Different lens groups are assigned different control bit allocation strategies based on their specific functional requirements. The first lens group receives more control bits when zooming is required to achieve larger movement range, while the second lens group receives more bits when focusing precision is needed, implementing local quality optimization.
3Adaptability or versatility
If multiple lens assemblies are added to enable zooming and focusing, then the functional versatility is improved, but the device complexity increases
Solution Approach 1:
The patent combines zooming, focusing, and optical image stabilization functions into a single integrated lens system with three lens groups that work together. The driving chip integrates control logic for all three functions, managing the coordination between lens groups to achieve multiple functions without proportionally increasing overall system complexity.
Solution Approach 2:
The driving chip is designed as a universal controller that can switch between different operational modes (zooming, focusing, optical image stabilization) and dynamically allocate control resources. This multi-functional design allows a single device to perform multiple operations without requiring separate dedicated control systems for each function.
Data Source
AI summary
A zoom lens, a camera module, and an electronic device are provided. A first control end and a second control end of the zoom lens respectively control a second lens assembly and a third lens assembly to move for zooming; a third control end and a fourth control end control, under a first target focal length, the third lens assembly to move for focusing, and control, under a second target focal length, the third lens assembly to move for focusing, and the first target focal length is different from the second target focal length.