Projection Optical System Holding Structure for Impact Stability
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Solution Overview
Problem
Existing projection display devices face challenges in reducing the distance between the projector body and the screen while maintaining optical quality, as heavier projection optical systems are prone to deformation due to inadequate holding structures, especially when subjected to impacts.
Innovation Solution
A holding structure comprising a combination of first and second cabinets with sandwiching mechanisms using bosses and bushes to securely attach the projection optical system, providing three-dimensional support and absorbing vibrations, thus preventing deformation and maintaining optical alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a projection optical system with a mirror and projection lens unit is used to reduce projection distance, then the projection distance is shortened, but the system becomes heavier and more prone to deformation under impact
Solution Approach 1:
The patent transitions from a single-cabinet planar support structure to a dual-cabinet three-dimensional sandwiching structure. The projection optical system is held between upper and lower cabinets, distributing support forces in multiple dimensions rather than relying on a single bottom face support, thereby addressing the weight and stability issues of the heavier optical system.
Solution Approach 2:
The cabinet structure is divided into upper and lower separate cabinets, each providing independent support functions. The upper cabinet supports the projection optical system from above while the lower cabinet supports from below, creating a segmented support system that better handles the weight and impact forces of the heavier optical configuration.
2Device complexity
If a planar holding structure with spacer and elastic bush is used for the optical engine, then the structure is simple, but it causes deformation when holding heavier projection optical systems under impact
Solution Approach 1:
The support structure evolves from two-dimensional planar support (single bottom face) to three-dimensional sandwiching support (upper and lower cabinets). This dimensional change provides support from multiple directions, significantly improving resistance to deformation under impact while maintaining reasonable structural complexity.
Solution Approach 2:
The upper cabinet, lower cabinet, and projection optical system are merged into an integrated sandwiching structure. The first supporting section in the upper cabinet and the second supporting section in the lower cabinet work together as a unified support system, combining their load-bearing capacities to reliably hold the heavy optical system.
3Length of moving object
If a wide-angle lens with large view angle is used for oblique projection, then projection distance is reduced, but costs increase due to large-sized lens and projector body
Solution Approach 1:
The projection optical system is segmented into separate functional components: the projection lens unit and the mirror are housed in a dedicated projection optical system housing. This segmentation allows for optimized design of each component, potentially reducing the need for an excessively large wide-angle lens while achieving the same projection distance reduction through the combined optical path.
Solution Approach 2:
The mirror serves as an intermediary element that redirects light at an oblique angle, enabling projection distance reduction without requiring an extremely wide-angle lens. This intermediary approach allows the use of a more cost-effective lens configuration while achieving the desired compact projection geometry.
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
The solution effectively reduces the projection distance while ensuring the projection optical system is securely held, preventing deformation and maintaining image quality even under impact, and reduces the number of assembly screws and man-hours.
Implementation Method 1
the optical engine that is a member to be held is placed on the spacer via an elastic bush
Data Source
AI summary
A member to be held is held in an external cabinet having a combination of a first cabinet and a second cabinet. A first supporting section is provided in the first cabinet and a second supporting section is provided in the second cabinet. A section to be sandwiched is provided in the member to be held, and the member to be held is held in the external cabinet by sandwiching this section to be sandwiched by the first supporting section and the second supporting section.