Blade Driving Device with Magnetic Support for Miniaturized Imaging
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Solution Overview
Problem
Conventional blade driving devices in imaging devices face challenges with smooth movement due to friction, requiring high torque actuators, leading to increased size and difficulty in achieving high-resolution, accurate control, especially in miniaturized camera units where space and power efficiency are crucial.
Innovation Solution
A blade driving device with a driving member supported separately from the base member, connected through a linking portion to prevent play, using a coil and magnet configuration with linear parts to produce a driving force, allowing for smooth movement and high-resolution control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a linear motor actuator is used to drive the blade member, then the device can achieve automated operation and precise control, but the actuator size increases and the overall device thickness increases
Solution Approach 1:
The blade member moves within a plane perpendicular to the optical axis rather than along the optical axis, enabling the actuator to be positioned in a different spatial dimension and reducing the thickness direction occupation
Solution Approach 2:
The actuator is integrated within the operating mechanism structure, with the coil and magnet assembly nested within the blade member assembly, allowing compact arrangement and reduced overall thickness
2Device complexity
If surface contact support is used for the movable member, then the structure is simple, but friction increases and smooth movement is prevented
Solution Approach 1:
The patent replaces direct surface contact mechanical support with magnetic field-based support, where the magnet on the blade member interacts with the coil on the base member to provide both support and driving force without physical contact
Solution Approach 2:
The magnetic field acts as an intermediary between the blade member and base member, transmitting force and enabling movement without direct mechanical contact, thus eliminating friction
3Volume of moving object
If a small driving stroke actuator is used for miniaturized devices, then the device size is reduced, but high-resolution continuous control becomes difficult
Solution Approach 1:
The patent employs feedback control where the actuator's position and the blade member's state are continuously monitored, allowing precise control adjustments within the limited stroke range to achieve high-resolution control
Solution Approach 2:
The operating mechanism uses dynamic motion transformation, converting the actuator's linear motion into rotational motion of the blade member through a linkage mechanism, which amplifies the effective control range and resolution
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
Enables continuous high-resolution and accurate control of blade members, reduces device thickness, and conserves power while maintaining high-speed operation, addressing the need for miniaturization and efficient power use in mobile electronic devices.
Implementation Method 1
A linear motor is provided with a magnet that is secured to one member, of a stationary base and a driving member for driving a blade member, or secured to the other member thereof, to drive the driving member within a plane (linear driving) through an electromagnetic driving force that is produced when an electric current is applied to the coil.
Data Source
AI summary
To enable continuous operational control of the blade member with high resolution and good accuracy, even when achieving miniaturization and thickness reduction in a blade driving device, through enabling smooth movement of a movable member in a blade driving device. A blade driving device 1 comprises: a base member 2 that has an opening 2A; one or a plurality of blade members 3 that operate so as to advance into the opening 2A or withdraw from the opening 2A; a driving member 4 that moves within a plane that is perpendicular to the optical axis that passes through the opening 2A, to drive the blade member 3; and supporting members 7 that are provided between the base member 2 and the driving member 4, so as to provide sliding support or elastic support of the driving member 4 in a state that is separated from the base member 2.