Capacitive Rotation Device with Extracted Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotation operation devices require a large number of electrodes, including both fixed and movable electrodes, which increases costs and complexity, especially since movable electrodes are needed on the rotation operation section for detection, complicating the design and increasing costs.
Innovation Solution
A rotation operation device with recessed and projecting sections, conductive sections, and electrode sections that change capacitance when moved, allowing detection of rotation direction and quantity without the need for movable electrodes on the operation section, using a combination of recessed and projecting sections, conductive sections, and electrode sections to detect changes in capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If movable electrodes are provided on the rotation operation section for detection, then rotation direction and quantity can be detected, but the number of electrodes increases and cost increases
Solution Approach 1:
The invention extracts the movable electrode from the rotation operation section and relocates it to the stationary holder. Only one movable electrode is needed on the holder, while the rotation operation section contains only recessed and projecting sections. This extraction reduces the number of electrodes from multiple (both fixed and movable on rotation section) to just one movable electrode, simplifying the device structure while maintaining detection capability
Solution Approach 2:
The invention inverts the conventional arrangement by placing the movable electrode on the stationary holder rather than on the rotating section. The rotation operation section contains only passive recessed and projecting sections that modulate the capacitive field. This inversion eliminates the need for multiple electrodes on the rotating part, reducing complexity while preserving detection functionality
2Measurement precision
If multiple electrodes are provided for rotation detection, then detection function is achieved, but manufacturing cost increases due to plating requirements
Solution Approach 1:
By extracting the movable electrode from the rotation operation section and placing it solely on the holder, the invention reduces the total number of electrodes from multiple to one. This eliminates the need for extensive plating on the rotation operation section, significantly reducing manufacturing cost while maintaining detection accuracy through the single movable electrode's interaction with the recessed and projecting sections
3Measurement precision
If movable electrodes are provided on the rotation operation section, then rotation detection is enabled, but the device structure becomes more complex
Solution Approach 1:
The invention extracts the movable electrode component from the rotation operation section and relocates it to the holder. The rotation operation section is simplified to contain only recessed and projecting sections that passively modulate the capacitive field. This structural extraction reduces complexity by eliminating the need for movable electrodes, plating, and associated mounting structures on the rotating part
Solution Approach 2:
The invention inverts the conventional design by placing the movable electrode on the stationary holder rather than on the rotating section. This inversion simplifies the rotation operation section's structure to only passive geometric features (recessed and projecting sections), reducing structural complexity while maintaining detection accuracy through the inverted electrode arrangement
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
Enables detection of rotation direction and quantity without the need for movable electrodes on the operation section, reducing complexity and cost while maintaining accurate operation, and providing a click feeling mechanism without additional components.
Implementation Method 1
an electrode section disposed so as to face the conductive section and changing a capacitance in accordance with a movement of the conductive section
Implementation Method 2
an elastic section that biases the protruding section by elasticity to each of the recessed and projecting sections, and movable in a recess-and-projection direction by each of the recessed and projecting sections
Data Source
AI summary
A rotation operation device includes: a rotation operation section having a cylindrical shape; multiple recessed and projecting sections arranged on an axial end surface or a peripheral surface of the rotation operation section; a conductive section having a protruding section protruding toward each recessed and projecting section and an elastic section biasing the protruding section to each recessed and projecting section, and movable in a recess-and-projection direction when the rotation operation section rotates; an electrode section changing a capacitance in accordance with a movement of the conductive section; and a detecting section detecting the change in the capacitance. The conductive section is moved in turn in the recess-and-projection direction at a different timing. The detecting section detects a rotation direction and a rotation quantity of the rotation operation section by means of a combination pattern of the change in the capacitance.