Blade Driving Device with Overlapping Rotating Actuator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional blade driving devices in camera units require large actuators to achieve significant blade movement, leading to increased size and thickness due to the need for high torque and separated placement of driving components, making it difficult to reduce the device's thickness and installation area.
Innovation Solution
A blade driving device configuration where the driving member is positioned to overlap the blade member at the periphery of the opening, allowing for a thinner design and reduced installation area by using a driving member that moves within a plane perpendicular to the optical axis, supported by rolling elements or elastic members, enabling smaller and more compact operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a rotating member with the actuator's force point near the rotary shaft and operating point at the tip end is used to achieve large blade movement through small driving stroke, then the blade movement range is improved, but the actuator size increases due to large torque requirements
Solution Approach 1:
The patent changes the actuator's movement from linear (perpendicular to optical axis) to rotational motion around the optical axis. This dimensional change allows the operating point to be positioned at a distance from the force point, creating a torque arm that amplifies the driving effect. The actuator moves in a plane perpendicular to the optical axis, and through the rotating member's lever arm, this produces rotational motion that drives the blade member with sufficient torque without requiring a large linear stroke.
2Length of moving object
If the blade member is operated through a relatively long rotating member, then the blade movement is improved, but the installation area increases due to separated placement of driving members
Solution Approach 1:
The patent merges the driving member and the rotating member into a more compact integrated structure. The driving member is positioned to overlap with the blade member at the periphery of the opening, and the rotating member connects these components in a space-efficient manner. This merging reduces the separation distance between driving members and eliminates the need for long connecting rods, thereby reducing the overall installation area while maintaining effective blade movement.
3Ease of operation
If the driving member is positioned away from the blade member to provide driving force, then the actuator operation is simplified, but the device thickness increases
Solution Approach 1:
The patent positions the driving member to move in a plane perpendicular to the optical axis, creating a lateral separation rather than axial separation. The driving member overlaps with the blade member at the periphery in the radial direction, while the connection is achieved through the rotating member that provides mechanical advantage. This spatial arrangement in a different dimension allows the driving force to be transmitted effectively without increasing the axial thickness of the device.
Data Source
AI summary
To enable achievement of a reduction in the thickness in a blade driving device that includes a driving member, and to enable a reduction in size of an installation area in a blade driving device that includes a driving member. The blade driving device 1 comprises a base member 2 that has an opening 2A, one or more blade members 3 that operate so as to advance into the opening 2A or withdraw from the opening 2A, and a driving member 4 that is supported on the base member 2 and that moves within a plane that is perpendicular to an optical axis that passes through the opening 2A, for driving the blade member, wherein the driving member 4 is disposed at a position that overlaps the blade member on the periphery of the opening 2A.