Pixel Shifting Device Asymmetric Shaft Rigidity
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Solution Overview
Problem
The existing pixel shifting devices in projectors face challenges in accurately shifting the light path due to differences in torsional angles and loads between shaft members, leading to imbalance and reduced durability, especially when using lightweight materials for the second frame.
Innovation Solution
The pixel shifting device incorporates a configuration where the second oscillation shaft formation parts have a one-side coupling shaft with higher rigidity and another-side coupling shaft with lower rigidity, allowing even thrust force transfer and balanced rotation, while the second actuators are arranged across the second oscillation axis to enhance durability and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the second frame is made with lightweight materials to reduce device weight, then the device weight is reduced, but the durability and load distribution of shaft members deteriorate due to increased torsional angle differences
Solution Approach 1:
The patent applies local quality by making the shaft members have different cross-sectional areas - the first shaft member has a larger cross-sectional area than the second shaft member. This creates non-uniform structural properties at different locations to compensate for the lightweight frame material, ensuring proper load distribution and torsional angle balance while maintaining overall device lightness
2Ease of manufacture
If the shaft members are made with uniform dimensions to simplify manufacturing, then manufacturing complexity is reduced, but the light path shifting precision deteriorates due to unbalanced torsional angles
Solution Approach 1:
The patent applies asymmetry by designing shaft members with different cross-sectional areas - the first shaft member has a larger cross-sectional area than the second shaft member. This asymmetric design compensates for the lightweight frame material and ensures balanced torsional angles, achieving precise light path shifting while remaining manufacturable
3Temperature
If the actuators are collectively arranged at one side to improve cooling efficiency, then heat dissipation is improved, but the device size increases due to the actuator holding part structure
Solution Approach 1:
The patent applies merging by integrating the actuator holding part into the existing frame structure rather than adding it as a separate component. The holding part is formed as part of the second frame, combining the actuator mounting function with the structural frame, thereby improving cooling efficiency while minimizing increase in device size
Data Source
AI summary
A pixel shifting device according to the present disclosure includes a first frame for holding an optical member, a second frame to be coupled to the first frame, a base to be coupled to the second frame, a pair of second oscillation shaft formation parts for coupling the second frame and the base to each other, and a pair of second actuators arranged across the second oscillation axis and for oscillating the second frame. The pair of second oscillation shaft formation parts include a one-side coupling shaft part for coupling the second frame and the base to each other at the actuator holding parts side, and another-side coupling shaft part for coupling the second frame and the base to each other at an opposite side to the actuator holding parts, and the another-side coupling shaft part is lower in rigidity than the one-side coupling shaft part.