Resonant Mirror Adhesive Fillet Control via Frame Opening
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Solution Overview
Problem
The adhesive joint between the mirror and the frame in resonant scanning mirror systems experiences repeated stress during oscillation, leading to potential failure, and controlling the adhesive placement is challenging, especially in high-volume production environments.
Innovation Solution
Incorporating an opening in the mirror mounting portion of the frame to constrain the adhesive flow and define the bond fillet location, using a suitable adhesive with high surface tension to prevent adhesive from reaching the flexure, and employing a curved spacer to distribute stress, allowing for relaxed manufacturing tolerances and simpler equipment usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to bond the mirror structure to the frame, then the mirror structure is secured in place, but the adhesive joint experiences repeated stress during oscillation leading to potential failure
Solution Approach 1:
The patent applies local quality by creating a fillet geometry at the adhesive joint that concentrates stress in a specific region away from the flexure. The fillet's curved shape distributes stress more effectively at the bonding interface, protecting the adhesive from repeated oscillation stresses while maintaining strong bonding between the mirror foot and frame.
Solution Approach 2:
The fillet geometry acts as a pre-designed stress cushion that absorbs and distributes oscillation stresses before they can reach the adhesive bond line. By incorporating this geometric feature in advance, the design protects the adhesive joint from fatigue failure without requiring additional materials or complex assembly steps.
2Reliability
If adhesive placement is controlled precisely to avoid the flexure, then adhesive joint reliability improves, but manufacturing complexity and equipment requirements increase
Solution Approach 1:
The frame opening is designed in advance to automatically guide and constrain adhesive placement. The opening's geometry pre-determines the adhesive path and fillet formation, eliminating the need for complex real-time control systems or precision positioning equipment during assembly. This preliminary structural action simplifies manufacturing while ensuring reliable adhesive placement.
Solution Approach 2:
The frame opening structure serves itself by automatically defining the adhesive bond geometry through its own geometry. The opening acts as a self-contained feature that guides adhesive flow and creates the protective fillet without requiring external tooling or complex manufacturing processes, thereby reducing equipment complexity while maintaining precision.
3Stability of the object's composition
If the adhesive fillet location is precisely defined, then stress distribution improves, but manufacturing precision requirements increase
Solution Approach 1:
The frame opening is pre-configured with specific dimensions and geometry that automatically define the adhesive fillet location and shape. This preliminary structural design ensures consistent stress distribution across all manufactured units without requiring high-precision adhesive placement, as the opening itself establishes the bond geometry during assembly.
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 enhances the longevity of the display device by stabilizing the adhesive joint against stress, facilitating higher volume production with less complex equipment and ensuring proper adhesive placement, thereby maintaining the resonant frequency and image scanning performance.
Implementation Method 1
using a suitable adhesive with high surface tension to prevent adhesive from reaching the flexure
Data Source
AI summary
Examples are disclosed that relate to a resonant scanning mirror system comprising a mirror structure mounted to a frame via an adhesive. One example provides a resonant scanning mirror system comprising a frame defining a perimeter around a space, the frame including a mirror mounting portion having an opening. The mirror system also comprises a mirror structure spanning the space, the mirror structure having an oscillating mirror portion and a foot, the foot being attached to the mirror mounting portion with an adhesive and being positioned such that a location of the opening in the mirror mounting portion at least partially defines a location of an edge of a fillet of the adhesive where the adhesive meets the foot of the mirror structure.