Lens Rotation Detection Layout for Reduced Radial Size
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Solution Overview
Problem
Existing lens devices face challenges in reducing their size in the radial direction while maintaining functionality, particularly in structures where extending portions extend from the body portion.
Innovation Solution
The lens device incorporates a fixation portion and a rotational movement portion with a detection member and a flexible flat cable, utilizing a Gray-code-based conductor pattern and contact brush for precise angle detection, allowing for a more compact design by optimizing the layout and connection of extending portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one extending portion extends from the body portion, then the connection structure is simple, but the radial size increases
Solution Approach 1:
The flexible flat cable is divided into multiple extending portions (first, second, third extending portions) that extend in different directions from the body portion. This segmentation allows the connection structure to be distributed radially rather than concentrated in one direction, effectively reducing the overall radial projection size while maintaining multiple connection paths.
Solution Approach 2:
The extending portions are arranged in different spatial dimensions and directions (first, second, and third directions) rather than extending linearly in one dimension. This multi-dimensional arrangement optimizes space utilization and reduces the radial footprint of the cable assembly.
2Area of stationary object
If multiple extending portions are added to reduce radial size, then the radial size decreases, but the connection structure becomes more complex
Solution Approach 1:
The flexible flat cable structure serves multiple functions simultaneously: it provides electrical connections through multiple extending portions, maintains flexibility for rotational movement, and achieves compact radial dimensions. The Gray-code-based conductor pattern further enables angle detection functionality, making the cable assembly a multi-functional component that reduces overall system complexity.
Solution Approach 2:
The patent combines the electrical connection function, flexibility for rotation, and angle detection functionality into a single integrated flexible flat cable assembly. The conductor pattern is directly formed on the flexible substrate, merging the cable and detection elements into one component rather than separate assemblies.
3Measurement precision
If a contact brush and conductor pattern are used for angle detection, then angle detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex optical or magnetic angle detection systems with a simpler mechanical contact-based detection system. The contact brush physically contacts the Gray-code conductor pattern on the flexible flat cable, converting rotational position into electrical signals through direct mechanical contact, thereby achieving precise angle detection with minimal structural complexity.
Solution Approach 2:
The Gray-code-based conductor pattern is directly formed on the flexible flat cable substrate itself, creating a self-contained detection system. The conductor pattern acts as a coded map that the contact brush reads to determine angle, eliminating the need for separate detection components or complex processing systems.
Data Source
AI summary
A lens device includes a fixation portion fixed to a lens mechanism and a rotational movement portion that is connected to the fixation portion to be rotationally movable. One of the fixation portion and the rotational movement portion includes a detection member and the other of the fixation portion and the rotational movement portion includes a detection target member and a substrate. The detection target member includes a body portion including an indicator of rotational movement and a plurality of extending portions extending from the body portion. The plurality of extending portions are connected to the substrate.