Light Scanning Apparatus Rib Stress Distribution
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Solution Overview
Problem
The existing light scanning apparatuses face damage during the pickup process due to excessive stress at the connection portion between the fixed frame and the actuator when the dicing tape is peeled off, as the stress generated is greater than what the fixed frame can handle, leading to potential breakage.
Innovation Solution
The light scanning apparatus incorporates ribs on the back surface of the mirror supporting portion and actuator with a wider contact portion than the straight portion, designed to distribute the stress and reduce damage during the peeling process, featuring a rib structure with straight and contact portions that are formed from the same height as the fixed frame to enhance rigidity and reduce stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fixed frame is thrust up with a needle through the dicing tape during the pickup process, then the light scanning apparatus can be separated from the wafer, but the stress generated at the connection portion between the fixed frame and the actuator exceeds the fixed frame's strength, causing damage
Solution Approach 1:
The fixed frame is divided into multiple segments: a frame body portion and multiple rib portions extending from it. The rib portions are positioned at locations where needles contact during the pickup process, distributing the thrust stress across multiple separate contact points rather than concentrating it at the vulnerable connection portions between the fixed frame and actuators.
Solution Approach 2:
The rib portions are strategically positioned at specific locations on the back surface of the fixed frame where needle contact occurs during pickup. This local reinforcement at stress concentration points allows the frame to withstand pickup forces without transmitting excessive stress to the actuator connection portions, while maintaining overall frame integrity.
2Manufacturing precision
If the dicing tape is attached to the rib on the back surface side during the dicing process, then the light scanning apparatus can be properly positioned for pickup, but the stress concentration at the connection portion between the fixed frame and actuator causes damage during peeling
Solution Approach 1:
The rib portions act as intermediary elements between the dicing tape and the fixed frame body. When needles contact the rib portions during pickup, the ribs serve as stress-distributing mediators that prevent direct force transmission to the actuator connection portions, thereby protecting the reliable operation of the actuator while enabling the pickup process.
3Stability of the object's composition
If a high rigidity fixed frame is used to support the formed region, then the structural stability is improved, but the stress generated during pickup process exceeds the frame's capacity, leading to breakage
Solution Approach 1:
The fixed frame is segmented into a frame body and multiple rib portions. This segmentation allows the frame to maintain overall rigidity for structural stability while the rib portions specifically handle the pickup stresses, preventing stress concentration at the actuator connection portions and eliminating breakage risk.
Data Source
AI summary
A light scanning apparatus includes a mirror supporting portion having a mirror on a front surface, an actuator configured to driving the mirror supporting portion, a fixed frame disposed around the mirror supporting portion and the actuator, and at least one rib disposed on a back surface side of the mirror supporting portion or the actuator, wherein the rib includes a straight portion and a contact portion having a width wider than a width of the straight portion.