Optical Scanning Device Rib Removal Vibration Control
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Solution Overview
Problem
Conventional optical scanning devices experience abnormal vibration in mirrors due to vibration propagation from the horizontal-rotation axis to the vertical-rotation axis, affecting the optical scanning performance.
Innovation Solution
The optical scanning device incorporates a movable frame with a rectangular shape and ribs on its rear surface, featuring absence regions at the corners where ribs are partially removed or thinner, which interrupts vibration propagation from the first drive axis to the second drive axis, preventing abnormal vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs are provided on the rear surface of the movable frame for reinforcement, then the strength and rigidity of the movable frame are improved, but vibration propagates from the horizontal-rotation axis to the vertical-rotation axis causing abnormal vibration of the mirror
Solution Approach 1:
The invention extracts or removes ribs from specific corner regions of the movable frame where vibration propagation occurs. By selectively removing ribs from the corner regions while maintaining them in other areas, the vibration path from the horizontal-rotation axis to the vertical-rotation axis is interrupted, preventing abnormal mirror vibration while preserving necessary structural strength in critical areas.
Solution Approach 2:
The invention applies local quality by creating non-uniform rib distribution across the movable frame. Corner regions have ribs removed or thinned to reduce vibration coupling, while other regions maintain full rib reinforcement. This localized modification allows different parts of the same structure to have different mechanical properties optimized for their specific functional requirements.
2Object-affected harmful factors
If the movable frame structure is modified to prevent vibration propagation, then abnormal vibration of the mirror is suppressed, but the structural reinforcement provided by ribs is reduced
Solution Approach 1:
The invention selectively extracts ribs only from corner regions where vibration propagation occurs, rather than removing ribs from the entire movable frame. This targeted removal interrupts the vibration path while preserving structural reinforcement in the main body of the frame, achieving vibration suppression without compromising overall structural strength.
Solution Approach 2:
The invention implements local quality by creating a non-uniform rib distribution pattern where corner regions have reduced or removed ribs for vibration control, while other regions maintain full rib reinforcement for structural strength. This localized differentiation allows simultaneous optimization of both vibration suppression and structural reinforcement.
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 effectively suppresses abnormal vibration of the mirror unit, ensuring stable optical scanning performance by managing the deflection angle and vibration modes.
Implementation Method 1
a mirror unit configured to reflect light beams
Data Source
AI summary
Provided is an optical scanning device capable of preventing abnormal vibration occurring in a micro mirror. The optical scanning device includes a micro mirror that reflects light beams, torsion bars that rotate the micro mirror around a Y-axis, a movable frame that is disposed around the micro mirror, and meander-type piezoelectric actuators that rotate the micro mirror around an X-axis. The movable frame has a rectangular shape, and has a rib provided on the rear surface of the movable frame. Corner regions of four corners of the movable frame have a removal region where no rib is partially provided or a rib with a thickness thinner than other regions is provided.