Blade Drive Device Substrate Housing Corner
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Solution Overview
Problem
In blade drive devices for optical apparatuses, the application of a covering material to prevent solder and flux from flying as foreign matter often results in malfunction due to wetting-spread and adherence to movable parts, leading to image quality degradation and mechanical issues.
Innovation Solution
A blade drive device design featuring a substrate housing part with a wall surface and corner portion that restricts the wetting-spread of the covering material, preventing its adherence to the blade and movable parts, while also allowing for a more compact configuration by positioning the blade closer to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a covering material is applied to the joint portion of the flexible substrate and the wire to prevent solder and flux from flying, then foreign matter adherence is prevented, but the covering material wetting-spreads over the shutter substrate surface and adheres to the movable part causing blade malfunction
Solution Approach 1:
The patent applies local quality by creating a specific structural feature (corner portion) at a specific location (wall surface of substrate housing part) to control the wetting-spread behavior of the covering material. The corner portion acts as a local barrier that prevents the covering material from spreading onto the shutter substrate surface and reaching the blade, while still allowing the covering material to effectively cover the joint portion and prevent solder/flux contamination.
2Reliability
If the covering material is applied within the substrate housing part, then the joint portion is covered, but the covering material wetting-spreads on the wall surface due to surface tension and may adhere to the blade
Solution Approach 1:
The corner portion acts as an intermediary structure between the covering material and the shutter substrate surface. It provides a physical barrier that intercepts the wetting-spread of the covering material, preventing direct contact between the covering material and the shutter substrate surface, thereby stopping the spread before it can reach the blade.
3Volume of moving object
If the blade is positioned closer to the substrate to reduce device dimensions, then compactness is improved, but the risk of covering material adherence to the blade increases
Solution Approach 1:
The corner portion is provided in advance as a preventive measure before the covering material is applied. This preliminary structural feature proactively blocks the wetting-spread path of the covering material, ensuring that even when the blade is positioned close to the substrate, the covering material cannot reach and adhere to the blade, thus maintaining reliability in the compact configuration.
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
The solution effectively prevents malfunction of the blades by restricting the covering material's spread and adherence, enhancing imaging performance and reducing the device's dimensions, thereby improving the reliability and compactness of the optical apparatus.
Implementation Method 1
the covering material wetting-spreads on the wall surface due to surface tension
Data Source
AI summary
To provide a blade drive device that may prevent malfunction of blades. A blade drive device includes a base plate having an opening to be opened and closed by a blade on an optical axis, and a flexible substrate having joint portions to which conductor wires of a first actuator and a second actuator that drive the blades are joined, the flexible substrate being provided between the base plate and the blades on one side of the base plate in an axis direction of the optical axis. The base plate is provided with a substrate housing part in which at least a part of the flexible substrate is housed and to which a covering material for covering the joint portions is applied. The substrate housing part is provided with wall surface extending from the other side toward the one side in the axis direction of the optical axis. The wall surface is provided with corner portions extending along a direction crossing the axis direction of the optical axis. The corner portions are provided between the blades and the flexible substrate in the axis direction of the optical axis.