Pixel Shifting Device Frame Rigidity via Beams
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Solution Overview
Problem
The challenge is to design a pixel shifting device for projectors that balances the need for a lightweight, large-sized second frame while maintaining structural integrity and preventing deformation or breakage under impact loads, as existing designs face issues with durability and reliability due to the use of lightweight materials.
Innovation Solution
The pixel shifting device incorporates a second frame with increased rigidity through the use of beams extending along the second oscillation axis and a frame reinforcement member, coupled with actuators disposed on one side to enhance structural support and stability, allowing for efficient oscillation and light path shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lightweight material is used for the second frame to reduce weight, then the weight of the projector is reduced, but the second frame becomes easy to deform or break under impact loads
Solution Approach 1:
The second frame is divided into multiple sections with reinforcement parts strategically positioned at vulnerable locations. The frame includes first reinforcement parts and second reinforcement parts that segment the structure into stronger zones, allowing the overall frame to remain lightweight while specific segments provide impact resistance where needed most.
Solution Approach 2:
The second frame uses composite construction combining lightweight materials with reinforcement parts made of stronger materials. This composite approach allows the frame to achieve both low weight and high strength characteristics by integrating different material properties within a single structure.
2Illumination intensity
If the size of the liquid crystal panel is increased to project a brighter image, then the image brightness is improved, but the size of the optical member and second frame must grow, making the frame more prone to deformation
Solution Approach 1:
Instead of increasing frame thickness (one dimension) to gain strength, the patent adds reinforcement parts in different spatial dimensions and positions around the optical member. This multi-dimensional approach to reinforcement allows the frame to support larger optical components without requiring excessive material thickness.
Solution Approach 2:
The reinforcement parts are strategically positioned at specific locations around the optical member where stress concentration is most likely to occur. This localized reinforcement approach provides maximum strength enhancement at critical points without unnecessarily increasing the overall frame size or weight.
3Area of moving object
If the second frame is made large in size to accommodate larger optical components, then the optical component size is increased for brighter images, but the frame becomes more susceptible to deformation under impact
Solution Approach 1:
The large second frame is segmented into multiple reinforced sections with reinforcement parts positioned at strategic locations. This segmentation allows the frame to maintain large overall dimensions for accommodating bigger optical components while specific segments provide localized strength to prevent deformation under impact.
Data Source
AI summary
A pixel shifting device includes a first frame which holds an optical member, and which oscillates around a first oscillation axis, a second frame oscillating around a second oscillation axis, a base to be coupled to the second frame via a first coupling part, a pair of first oscillation shaft formation parts for coupling the first frame and the second frame, a first actuator for oscillating the first frame, and a second actuator for oscillating the second frame, wherein the second frame and the base have an extending part which extends along the second oscillation axis, and in which the second actuator is disposed, and the pair of first oscillation shaft formation parts have a pair of second coupling parts for coupling the first and second frames, and a pair of beams extending on the second frame respectively from the pair of second coupling parts along the second oscillation axis.