Operation Ring Recessed Plating for Lens Rotation Detection
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Solution Overview
Problem
Existing lens devices face challenges in accurately detecting the rotation position and direction of operation rings with high resolution, leading to inefficiencies in zoom and focus mechanisms.
Innovation Solution
The implementation of an operation ring with recessed portions and plating on its inner peripheral surface, featuring inclined and/or recessed surfaces, allows for precise detection of rotation using sensors, enhancing the accuracy of zoom and focus operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional operation rings without recessed portions are used, then the structure is simple and manufacturing is easy, but the rotation position detection resolution is insufficient
Solution Approach 1:
The operation ring is divided into multiple recessed portions (first recess portions and second recess portions) that are distributed around the inner peripheral surface. Each recessed portion contains reflective surfaces that interact with light from the detection device, creating distinct detection signals. This segmentation allows for high-resolution rotation position detection by providing multiple discrete reflection points around the ring circumference.
Solution Approach 2:
The invention adds a radial dimension to the detection pattern by creating recessed portions that extend radially inward from the inner peripheral surface. The reflective surfaces are positioned at different radial depths, creating a multi-level structure that enhances light reflection characteristics. This dimensional addition improves detection resolution without requiring increased circumferential complexity.
2Measurement precision
If high-resolution detection patterns are added to the operation ring, then rotation position detection accuracy improves, but manufacturing precision requirements increase
Solution Approach 1:
The recessed portions are formed in the operation ring before the final assembly and detection system integration. By pre-forming the recessed structures with standardized dimensions and positions, the manufacturing process establishes a consistent geometric foundation that simplifies subsequent detection system calibration and reduces the need for high-precision field adjustments.
Solution Approach 2:
The invention optimizes the dimensional parameters of the recessed portions, including their depth, width, and spacing, to achieve effective detection resolution with moderate manufacturing tolerances. The reflective surfaces are positioned at specific radial distances and angular intervals that maximize detection signal strength while accommodating standard manufacturing capabilities.
3Measurement precision
If multiple recessed portions with reflective surfaces are formed, then detection resolution increases, but the manufacturing process becomes more complex
Solution Approach 1:
The formation of multiple recessed portions with reflective surfaces is integrated into a single manufacturing process step. The operation ring is processed to create all recessed portions simultaneously or in a standardized sequence, and the reflective surfaces are applied as part of the same manufacturing workflow. This merging of operations maintains manufacturing efficiency while achieving high detection resolution.
4Volume of stationary object
If the operation ring uses carbon fiber composite material, then the lens barrel size and cost are reduced, but the inner peripheral surface finish may be insufficient for accurate detection
Solution Approach 1:
The recessed portions act as intermediary structures that enhance the optical interaction between the carbon fiber composite ring and the detection light. By creating controlled geometric features within the composite material, the invention compensates for the inherently rough surface finish of carbon fiber, providing well-defined reflection points that improve detection accuracy despite the composite material's natural surface characteristics.
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 enables high-resolution detection of rotation positions, facilitating efficient component disposition, reducing the size and cost of the lens barrel, and improving assembly processes.
Implementation Method 1
a detection pattern portion having a reflective surface and a non-reflective surface that are alternately disposed in a rotation direction of the operation ring... The light-emitting element emits the light to the detection pattern portion. The plurality of light-receiving elements are disposed on the same substrate and receive reflected light from the reflective surface.
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 that is a part of the optical system, in accordance with rotation of the zoom ring. The zoom ring includes a ring member, a first recess portion formed in the ring member, and plating applied to the first recess portion, and an inclined part is formed in the first recess portion.