Integrated Blade Driving Device for Compact Multi-Position Light Control
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Solution Overview
Problem
Existing blade driving devices face challenges in assembly complexity and structural difficulty due to split electromagnetic actuators, increased part count, and the need for multi-pole magnetization, especially when multiple stopping positions are required.
Innovation Solution
A blade driving device with a one-piece rotary body integrated with the blade, utilizing a magnetic member with two magnetic poles, driving coils, and magnetic yokes, allowing for compact assembly and efficient light adjustment through a housing with an optical axis channel, and position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electromagnetic actuator is split at the assembly stage, then the assembly process becomes simpler, but the structural difficulty and number of parts increase
Solution Approach 1:
The patent merges the electromagnetic actuator into an integrated structure where the coil assembly and magnet assembly form a unified driving unit. The coil is wound around a core that directly interacts with the magnet on the rotary body, eliminating the need for separate split actuators while reducing overall part count and assembly complexity.
Solution Approach 2:
The integrated electromagnetic actuator serves multiple functions: it provides both the magnetic field generation (through the coil) and the mechanical coupling (through the core and magnet interaction) in a single assembly unit. This multi-functional design reduces the number of separate components needed.
2Measurement precision
If multiple arbitrary stopping positions are desired, then the control precision is improved, but the design and manufacturing difficulty increases due to multi-pole magnetisation requirements
Solution Approach 1:
The patent divides the rotary body into multiple segments or positions, each with its own magnetic pole configuration. By using a single actuator with multiple magnetic poles (N and S poles arranged alternately), the system can achieve multiple stopping positions without requiring separate actuators for each position, thus maintaining manufacturing simplicity while achieving precise multi-position control.
Solution Approach 2:
The patent changes the magnetic field parameters by arranging multiple magnetic poles (at least two N poles and two S poles) on the rotary body. This allows the single actuator to generate multiple stable stopping positions by interacting with different pole combinations, achieving arbitrary stopping positions without increasing manufacturing complexity.
3Use of energy by moving object
If the shape of the magnet sheet is adjusted at a very tight angle, then the magnetic field distribution is optimized, but the manufacturing precision requirements become extremely high
Solution Approach 1:
The patent uses asymmetric magnetic pole arrangements on the rotary body, where the N and S poles are positioned at specific non-symmetric angles relative to each other. This asymmetric configuration optimizes the magnetic field distribution for efficient actuation while using standard manufacturing tolerances, avoiding the need for extremely tight angle precision that would be required by symmetric configurations.
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
Simplifies assembly, reduces part count, and achieves efficient light control with a more compact structure, enabling multiple stopping positions and improved durability.
Implementation Method 1
at least one driving coil, an orthographic projection of the rotary body in a direction of the optical axis channel has an overlapping area with the at least one driving coil
Implementation Method 2
The rotary body is a magnetic member with at least two magnetic poles
Data Source
AI summary
Provided are a blade driving device, a camera device and a portable electronic device. The blade driving device includes a housing, a rotary body, a blade, at least one driving coil, a circuit board and at least one magnetic yoke. At least one rotating shaft extending into the accommodation space is disposed on the housing. The rotary body is a magnetic member with at least two magnetic poles. The blade includes one end fixedly connected to the rotary body and rotatable with the rotary body, and another end provided with a shielding portion and an opening portion. Compared with the related art, the present disclosure achieves compactness by omitting a number of mounted parts, realizing high efficient utilization of space and simplicity of structure and assembly, and enabling more efficient blade driving with a simpler structure.