Blade Drive Device Compact Actuator Arrangement
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Solution Overview
Problem
Existing blade drive devices occupy excessive space in the planar direction perpendicular to the optical axis, increasing the size of the device and limiting its application in compact optical instruments.
Innovation Solution
The design incorporates first and second actuators with stators, rotors, and coils that drive blades through overlapping drive members, optimizing the arrangement to reduce the device's size by positioning drive members to overlap stators and coils in the optical axis direction, thereby minimizing the spindle diameter and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the actuator and drive lever are arranged in a conventional configuration, then the functional requirements are met, but the space occupied on the board increases, leading to a larger device size
Solution Approach 1:
The patent transitions from a planar arrangement of actuators and drive members to a three-dimensional configuration where drive members are positioned in the optical axis direction. This vertical stacking allows the drive members to overlap with stators and coils, effectively utilizing the Z-dimension to reduce the footprint area on the board while maintaining all necessary functional relationships between components
2Area of stationary object
If the drive members are positioned to overlap stators and coils in the optical axis direction, then the planar size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements a nested arrangement where drive members are positioned within the spatial envelope of stators and coils in the optical axis direction. This nesting allows multiple components to occupy overlapping projections, with the drive members effectively 'nested' within the magnetic field region, maximizing space utilization while maintaining functional integrity
Solution Approach 2:
By moving the drive members into the optical axis direction and allowing them to overlap stators and coils vertically, the patent transforms a two-dimensional layout problem into a three-dimensional arrangement, reducing planar footprint while the precise positioning in the Z-dimension manages the increased manufacturing precision requirements
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
This configuration reduces the size and weight of the blade drive device in the planar direction perpendicular to the optical axis, enhancing its compactness and performance in optical instruments like digital cameras.
Implementation Method 1
first and second actuators respectively include first and second stators, first and second rotors, and first and second coils
Data Source
AI summary
A blade drive device includes: a board including an opening; first and second blades opening and closing the opening; and first and second actuators respectively driving the first and second blades, wherein the first and second actuators respectively include first and second stators, first and second rotors, and first and second coils, and respectively drive the first and second blades through first and second drive members, the first drive member is arranged to overlap the first stator and the first coil in an optical axis direction, and the second drive member is arranged to overlap the second stator and the second coil in the optical axis direction.