Operation Ring with Segmented Surface for High-Resolution Lens Position Detection
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Solution Overview
Problem
Existing operation rings for lens devices struggle to detect rotation positions with high resolution while maintaining cost effectiveness.
Innovation Solution
The operation ring features a ring member with a pattern portion having first and second light reflectivity sections, printed on a surface parallel to the rotation axis, combined with inclined surface portions to facilitate accurate pattern formation and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pattern portion is formed on an inclined surface of the operation ring, then the structure is simpler and manufacturing is easier, but the printing precision and pattern formation accuracy deteriorate
Solution Approach 1:
The inner peripheral surface is segmented into multiple regions: a first surface portion that is parallel to the rotation axis (for high-precision pattern printing) and second surface portions that are inclined (for ease of molding). This segmentation allows each region to serve its optimal function while combining benefits of both approaches
Solution Approach 2:
Different surface portions are assigned different qualities: the first surface portion has a parallel orientation optimized for printing precision, while the second surface portions have inclined orientations optimized for molding ease. This local differentiation resolves the contradiction by applying the right surface property to the right location
2Measurement precision
If high-resolution detection pattern is formed on the operation ring, then rotation position detection precision improves, but manufacturing cost increases
Solution Approach 1:
The operation ring itself serves dual purposes: it provides the structural function of a rotating component and simultaneously carries the high-resolution detection pattern. By integrating the pattern directly into the ring structure on the parallel surface portion, the system achieves high detection precision without requiring separate expensive components
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 allows for high-resolution detection of rotation positions and suppresses cost increases, while enabling precise pattern formation and reducing the size and complexity of the lens device.
Implementation Method 1
the pattern portion has a first pattern portion having first light reflectivity and a second pattern portion having second light reflectivity
Data Source
AI summary
A lens barrel includes a zoom ring, an optical system, and an electric zoom mechanism that drives a zoom lens group in accordance with rotation of the zoom ring. The zoom ring includes a ring member and a pattern portion, the pattern portion has a first pattern portion having first light reflectivity and a second pattern portion having second light reflectivity, the first light reflectivity is higher than the second light reflectivity, an inner peripheral surface of the ring member has a first surface portion parallel to a rotation axis of the ring member and a second surface portion inclined with respect to the rotation axis, and printing is performed on the first surface portion to form the pattern portion.