Capacitive Operation Device for Compact Multi-Function Control
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Solution Overview
Problem
The existing power window switch configuration requires multiple buttons to assign additional functions, leading to increased size due to the inability to reduce switch button width below that of an operation finger.
Innovation Solution
An operation device with a single unit that assigns multiple functions based on touch position and operation direction, utilizing a detection unit to determine the instructed function through capacitive sensors and a control unit to process the data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switch buttons are arranged to assign additional functions, then the functional versatility is improved, but the device size increases
Solution Approach 1:
A single operation unit is designed to perform multiple functions by detecting different touch positions on its surface. The detection unit identifies where the operation finger contacts the operation unit, and the control unit assigns different functions based on these positions, allowing one unit to replace multiple buttons while maintaining functional versatility
Solution Approach 2:
The invention transitions from a one-dimensional approach (multiple buttons arranged in space) to a two-dimensional approach (different positions on a single operation unit surface). By utilizing the surface area of one operation unit and detecting touch positions across this surface, multiple functions can be assigned without increasing the overall device footprint
2Area of stationary object
If the width of switch button is reduced to fit more functions, then the device size is reduced, but the ease of operation deteriorates
Solution Approach 1:
The operation unit maintains a standard width suitable for finger operation while incorporating multiple functions through position-based detection. The detection unit senses different contact positions on the operation unit's surface, allowing full functionality to be achieved without reducing the operational width below comfortable finger dimensions
3Measurement precision
If detection sensors are placed on the operation unit surface, then the touch position detection precision is improved, but the reliability deteriorates due to wire breakage risks
Solution Approach 1:
The invention replaces mechanical contact sensors with capacitive sensors that detect touch positions through electrical field changes. This non-contact detection method eliminates the need for physical wire connections to moving parts, significantly reducing the risk of wire breakage while maintaining accurate touch position detection capability
Solution Approach 2:
The capacitive sensors act as an intermediary between the user's finger and the control system. They detect touch positions through changes in electrical capacitance caused by the proximity or contact of the finger, without requiring direct mechanical or wired contact, thus improving reliability while preserving detection precision
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 multiple functions to be assigned to a single operation unit without increasing size, allowing for efficient and compact operation while preventing issues like wire breakage from sensor placement.
Implementation Method 1
a detection unit that is arranged on at least one plane extended including a plane facing the operation unit to detect the operation finger performing an operation on the operation unit
Data Source
AI summary
An operation device includes an operation unit to which a plurality of functions of an operated object are assigned corresponding to a position to be touched by an operation finger, a detection unit that is arranged on at least one plane extended including a plane facing the operation unit to detect the operation finger performing an operation on the operation unit, and a determination unit to determine an instructed function based on a combination of the operation performed on the operation unit and the touch position of the detected operation finger.