Light Adjusting Apparatus Notch Joining for Thin Blade Assembly
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Solution Overview
Problem
Existing light adjusting apparatuses face challenges in assembling thin components due to deformation issues during press fitting, making it difficult to maintain high product accuracy and achieve a compact, low-price, and lightweight structure, especially when the outer diameter of the shaft is about 0.2 mm and the diaphragm blade thickness is approximately 50 μm.
Innovation Solution
A light adjusting apparatus design featuring a rotating shaft member and a light adjusting unit joined at a notch, with the rotating shaft member and light adjusting unit aligned at their centers, allowing for easy assembly and high product accuracy, using a frame member with a circular arc shape to regulate movement and prevent deformation, and employing an electromagnetic driving source with a yoke and winding coil for rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the diaphragm blade is made thinner to achieve small-sizing, then the compactness and slimness are improved, but the deformation during press fitting becomes more remarkable
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the rotating shaft member and the diaphragm blade. This resin layer fills the gaps and irregularities in the press fit interface, distributing the pressing force uniformly and preventing localized stress concentrations that would cause deformation of the thin diaphragm blade during assembly.
Solution Approach 2:
The surface roughness parameters of the rotating shaft member are specifically controlled (Ra 0.3-3.0 μm) to optimize the interface characteristics. This parameter change ensures adequate mechanical interlocking while preventing excessive stress on the thin diaphragm blade, resolving the contradiction between secure attachment and deformation prevention.
2Strength
If press fitting is used to join the shaft and diaphragm blade, then the assembly strength is improved, but the assembly difficulty increases due to deformation
Solution Approach 1:
The resin layer serves as a mediator that enables reliable joining of the shaft and diaphragm blade without requiring high pressing forces. It compensates for dimensional variations and surface irregularities, allowing assembly even with tight tolerances while maintaining sufficient joining strength for the application.
3Manufacturing precision
If machining tolerance is reduced to improve precision, then the product accuracy is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
Instead of requiring extremely tight machining tolerances, the invention changes the surface roughness parameters to a practical range (Ra 0.3-3.0 μm). This parameter change maintains adequate assembly precision while being achievable with standard manufacturing processes, avoiding the need for specialized high-precision machining equipment and processes.
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 enables easy assembly and maintains high product accuracy while achieving a compact, lightweight, and thin structure, reducing the impact of machining tolerance limitations and preventing deformation during assembly.
Implementation Method 1
a driving unit which moves the light adjusting unit, and light which passes through the optical aperture is adjusted by turning the light adjusting unit to an optical aperture position and a retracted position of being retracted from the optical aperture by moving the light adjusting unit by rotating the rotating shaft member by the driving unit
Data Source
AI summary
A light adjusting apparatus according to the present invention includes a first substrate and a second substrate having an optical aperture, a rotating shaft member which has been rotatably installed with respect to the first substrate and the second substrate, a light adjusting unit which is joined to the rotating shaft member, and a driving unit which moves the light adjusting unit by driving to rotate the rotating shaft member. Light which passes through the optical aperture is adjusted by moving the light adjusting unit by rotating the rotating shaft member by the driving unit. The light adjusting unit has a notch, and the rotating shaft member and the light adjusting unit are joined at the notch.