Lens Frame Centering Mechanism with Inclining Surface
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Solution Overview
Problem
Existing centering mechanisms for lens units, such as those described in JP-A-2002-14267, require multiple adjusting screws and fixing screws, resulting in a complex configuration that complicates high-precision centering of lenses.
Innovation Solution
A centering mechanism featuring a lens frame with an inclining surface and centering pins that contact the surface to move the lens frame and prevent inclination, allowing for high-precision centering without additional components to prevent lens tilt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple adjusting screws and fixing screws are used to center the lens group, then the lens can be centered, but the device complexity increases and the adjustment process becomes more difficult
Solution Approach 1:
The patent extracts the separate inclination prevention function from the traditional multi-screw system. By providing a reference surface on the lens frame that directly contacts the lens group, the design eliminates the need for separate fixing screws to prevent inclination, reducing component count while maintaining centering precision
Solution Approach 2:
The lens frame's reference surface serves itself to prevent lens group inclination. The contact between the reference surface and the lens group inherently prevents tilting without requiring additional active components or complex adjustment mechanisms, simplifying the overall structure
2Manufacturing precision
If multiple adjusting screws are used to adjust lens inclination, then centering can be achieved, but the ease of operation deteriorates due to multiple adjustment steps
Solution Approach 1:
The patent removes the complex multi-step adjustment process by extracting the inclination control function into a passive reference surface contact mechanism. This allows centering to be achieved with fewer adjustment operations, improving ease of operation while maintaining precision
Solution Approach 2:
Instead of using screws to actively push or pull the lens group into position, the patent inverts the approach by providing a reference surface that passively contacts and constrains the lens group. This inversion simplifies the adjustment process by reducing the number of active adjustment elements required
Data Source
AI summary
A centering pin pushes an inclining surface provided as part of a side section of a lens frame that accommodates a centering target lens that is a centering target lens group to allow the centering target lens to move in a centering direction. In this process, an end surface of the lens frame is always urged against a reference surface that positions the lens frame attached to an attachment section of a lens barrel in the optical axis direction.