Blade Driving Device Adjustment Hole Geometry for Light Control
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Solution Overview
Problem
Variation in the position of the mechanical stopper within the component tolerance range causes variations in the minimum diameter of the light passing hole in camera devices, affecting the amount of light incident on the lens.
Innovation Solution
A blade driving device with a first member having adjustment pins and a second member with shaft pins, where the blades have adjustment holes and shaft holes, allowing for precise control of the light passing hole diameter by adjusting the position of the adjustment pins within specific sections of the adjustment holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical stopper is used to restrict the movement of the guide pillar, then the minimum diameter of the light passing hole can be controlled, but variation in the position of the mechanical stopper within the component tolerance range causes variation in the minimum diameter of the light passing hole
Solution Approach 1:
The patent changes the geometric parameters of the adjustment hole from a simple circular shape to a complex shape with multiple sections (first section, second section, and third section) having different radial distances from the optical axis. This parameter change ensures that regardless of where the adjustment pin stops within the adjustment hole, the corresponding blade position maintains the minimum diameter requirement, thereby resolving the contradiction between controllable minimum diameter and position variation tolerance.
Solution Approach 2:
The adjustment hole is segmented into multiple sections (first section, second section, third section) with different radial distances from the optical axis. Each section corresponds to a different operational state of the blade. This segmentation allows the system to maintain the minimum diameter requirement across different stopping positions of the adjustment pin, thereby improving reliability while maintaining manufacturing precision.
2Manufacturing precision
If the adjustment hole is designed with a specific shape and position, then the minimum diameter of the light passing hole can be suppressed, but the structure becomes more complex
Solution Approach 1:
The patent employs parameter changes by defining the adjustment hole with specific geometric parameters (different radial distances for different sections) rather than using a simple shape. Although the shape is more complex, the parameters are carefully selected to ensure the minimum diameter requirement is met across all operational positions, achieving precision through controlled complexity.
Solution Approach 2:
The adjustment hole is pre-designed with multiple sections at specific radial distances from the optical axis before assembly. This preliminary design ensures that regardless of where the adjustment pin stops within the adjustment hole, the corresponding blade position will maintain the minimum diameter requirement, thereby achieving precision control in advance.
Data Source
AI summary
A blade driving device includes a first member having a plurality of adjustment pins provided on a circumference centered on an optical axis of a lens body, a second member including shaft pins provided in correspondence with the adjustment pins and a plurality of blades. Each blade includes an adjustment hole movably fitting the adjustment pin and a shaft hole in which the shaft pin is rotatably fixed, and being combined to form a light passing hole in the center thereof through which light incident on the lens body passes. The first member and the second member are combined with each other so that one rotates relative to the other centered on the optical axis of the lens body, and the other has a mechanical stopper that stops the rotation of the one by making the one touch on the other.