Lens Shift Mechanism Sliding Load Reduction
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Solution Overview
Problem
Conventional lens shifting mechanisms face challenges in reducing sliding load while maintaining adjustment accuracy, and incorporating tilt correction functions, leading to instability and increased device size.
Innovation Solution
A lens shifting mechanism that uses shafts as guide members for the movable base, with correction screws for optical axis tilt and position adjustments, reducing sliding load and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure contact force is increased to prevent positional displacement between movable bases, then positioning stability is improved, but sliding load increases and smooth adjustment becomes difficult
Solution Approach 1:
A guide member is introduced as an intermediary component between the movable base and the fixed base. The guide member includes a guide surface that contacts the movable base, and a pressing member that applies pressure to the guide member. This intermediary structure allows the pressure to be applied to the guide member rather than directly to the movable base, reducing the friction and sliding load while maintaining positioning stability through the guide surface contact.
2Ease of operation
If pressure contact force is decreased to reduce sliding load, then smooth adjustment is improved, but positioning stability deteriorates
Solution Approach 1:
The guide member serves as a mediator that decouples the relationship between pressure magnitude and friction force. By applying pressure to the guide member through the pressing member, the system can use low friction surfaces on the guide member to maintain stability with reduced contact pressure, thus reducing sliding load while preserving positioning accuracy.
3Volume of moving object
If surface sliding structure is used for movable base, then device size is reduced, but tilt correction function cannot be incorporated
Solution Approach 1:
The guide member is designed to perform multiple functions: it guides the movable base during shifting operations and simultaneously serves as a reference for tilt correction. The pressing member that applies pressure to the guide member can be adjusted to correct tilt of the projection lens, allowing the same structural component to fulfill both positioning and optical alignment functions without increasing device size.
Data Source
AI summary
Provided is a projection video display device with which a sliding load is minimized while maintaining an adjustment precision in a lens shift mechanism. A lens shift mechanism (32) which moves a projection lens in a direction which is orthogonal to the optical axis of projected light has a configuration in which mobile bases (50, 60), which retain the projection lens, slide using a shaft (52), which is attached on a fixed member (4) side, as a guide member. A further aspect of the configuration is that a correction screw is inserted from the rear face side of the fixed member (4) to make contact with the shaft (52), and optical axis tilt and misalignment of the projection lens are corrected by adjusting the degree of insertion of the correction screw.