Optical Device Movable Unit with Rib and Frame Distortion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The optical device experiences distortion in the movable unit due to sectional forces from torsion support portions during movement, which deteriorates optical characteristics and requires improved reliability.
Innovation Solution
The optical device incorporates a movable unit with a main body portion surrounded by a frame portion and connection portions, featuring rib portions with specific thickness and width configurations to minimize the transmission of torsion support forces, ensuring balanced connection points and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple torsion support portions are connected to the movable unit, then the movable unit can be supported stably, but distortion occurs in the movable unit due to sectional forces during movement
Solution Approach 1:
The movable unit is divided into a main body portion and a frame portion that are separated by a predetermined interval. Connection portions link these two parts, creating a segmented structure that allows the frame to absorb sectional forces from torsion support portions without transmitting them to the main body, thus preventing distortion while maintaining stability
Solution Approach 2:
Connection portions act as intermediary elements between the main body portion and the frame portion. These connection portions are strategically designed with specific width constraints to transmit necessary mechanical support while filtering out detrimental sectional forces that would cause distortion to the main body
2Shape
If the width of connection portions is reduced to suppress distortion, then less sectional force is transmitted to the main body portion, but the connection strength may be compromised
Solution Approach 1:
The width of connection portions is precisely controlled within a specific range (smaller than the distance to torsion support connection positions but larger than the interval between main body and frame). This parameter optimization allows the connection portions to be thin enough to suppress distortion while remaining strong enough to provide reliable mechanical connection
3Shape
If rib portions are added to increase thickness at outer edges, then distortion is suppressed, but device complexity increases
Solution Approach 1:
Rib portions are added only to the outer edge portions of the movable unit, not throughout the entire structure. This localized reinforcement increases thickness specifically where needed to suppress distortion, while keeping the central portion and overall structure relatively simple
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 distortion in the movable unit, enhancing the reliability and stability of the optical device while maintaining optical performance.
Implementation Method 1
a pair of elastic support units that are connected between the base and the movable unit and supports the movable unit so that the movable unit is movable along a movement direction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In an optical device, a movable unit includes a main body portion, a frame portion that surrounds the main body portion with a predetermined interval from the main body portion, and a plurality of connection portions which connect the main body portion and the frame portion to each other. An outer edge portion of the main body portion includes a first rib portion that is formed so that the thickness of the outer edge portion is larger than the thickness of the central portion. The frame portion includes a second rib portion that is formed so that the thickness of the frame portion is larger than the thickness of the central portion. A width of each of the connection portions is larger than an interval between the main body portion and the frame portion, and is smaller than a distance from a connection position with each of the connection portions in the frame portion to any of a connection position with each of a pair of first torsion support portions and a connection position with each of a pair of second torsion support portions.