Lens Moving Mechanism Triaxial Guide Rigidity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing weight of lenses in projectors poses a challenge for lens moving mechanisms, which require high rigidity and lightweight designs, leading to potential bending issues due to differences in rigidity between the frame and linear motion guide devices.
Innovation Solution
A lens moving mechanism featuring a lens mount unit, a lens guide unit that supports the mount in triaxial orthogonal directions, and a fixing member with linear motion guide devices made of stainless steel, providing rolling element grooves and endless circulation paths to distribute loads uniformly and prevent bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lightweight aluminum cast frame is used for the lens moving mechanism, then the weight is reduced, but the rigidity decreases causing bending
Solution Approach 1:
The patent uses an aluminum cast frame (lightweight material) combined with linear motion guide devices made of different material (higher rigidity material). This composite structure allows the frame to remain lightweight while the linear motion guide devices provide the necessary rigidity and support, resolving the contradiction between weight reduction and maintaining strength.
2Strength
If a highly rigid linear motion guide device is mounted on the frame, then the rigidity is improved, but bending occurs due to rigidity difference between frame and guide device
Solution Approach 1:
The patent applies local quality by making the linear motion guide devices with different material properties than the frame. The guide devices are designed with higher rigidity locally at the critical support points where they contact the frame, while the rest of the frame remains lightweight aluminum cast structure. This localized reinforcement prevents bending at critical joints without requiring the entire frame to be heavy and rigid.
3Quantity of substance
If the lens weight is increased for large projectors, then the projection quality is improved, but the lens moving mechanism requires higher weight capacity and rigidity
Solution Approach 1:
The patent employs composite materials strategy where the aluminum cast frame provides lightweight structural support while the linear motion guide devices made of higher rigidity material provide the necessary load-bearing capacity for heavy lenses. This combination allows the system to support increased lens weight without requiring the entire mechanism to be heavily constructed.
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 inhibits bending and achieves a lightweight, highly rigid lens moving mechanism capable of supporting heavy lenses without deformation.
Implementation Method 1
a plurality of rolling elements disposed between the rolling element rolling groove and the rolling element load rolling groove
Data Source
AI summary
A lens moving mechanism includes a guide section which supports a lens mount unit on which a lens for projecting light is mounted and guides the lens mount unit in three orthogonal axis directions including an optical axis direction of the light, and a base member which supports a saddle guide unit of the guide section and is fixed to a projector main body. The saddle guide unit includes first linear motion guide devices which are fixed to the base member and guide the lens mount unit in an orthogonal-to-optical axis direction orthogonal to the optical axis direction.