Input Device Back Touchpad Area Restriction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional terminals with input units on both sides of the body case often experience incorrect pointing due to middle, third, and little fingers unintentionally activating the touchpad on the back side, leading to false detection and interference with intended forefinger input.
Innovation Solution
An input device with a first touch type position detection unit on the front and a second touch type position detection unit on the back, along with a detection area restriction unit that limits the detectable area on the back based on the first touch position, using pre-determined data to differentiate between intended and unintended touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touchpad unit is provided on the back side of the body case for input operations, then input versatility is improved, but false detection occurs when fingers other than the forefinger touch the touchpad
Solution Approach 1:
The detection area restriction unit dynamically adjusts the sensitive area of the touchpad based on the detected thumb position. When the thumb is detected on the front touch panel, the system calculates and restricts the detection area on the back touchpad to only the region that should be activated by the forefinger, while ignoring other regions that might be touched by middle, third, or little fingers.
2Ease of operation
If the entire back surface is made detectable for input, then ease of operation is improved, but incorrect pointing occurs due to unintended finger touches
Solution Approach 1:
The system performs preliminary detection of the thumb position on the front touch panel before enabling detection on the back touchpad. Based on the thumb's position, the system pre-calculates and activates only the appropriate detection area on the back, ensuring that only intended forefinger touches are registered while preventing false activation from other fingers.
3Adaptability or versatility
If multiple fingers can touch the back touchpad simultaneously, then input flexibility is improved, but false detection interferes with intended input
Solution Approach 1:
The system applies different detection qualities to different regions of the back touchpad. The detection area restriction unit creates a localized sensitive zone that corresponds only to the forefinger's expected contact area, while other regions are set to ignore touches from middle, third, and little fingers, thus maintaining input flexibility while ensuring detection accuracy.
Data Source
AI summary
An input device includes a body unit, a first touch type position detection unit which detects a first touch position of a human body on a first detection surface of the body unit, a second touch type position detection unit which detects a second touch position of the human body on a second detection surface of the body unit, the second detection surface being on an opposite side of the body unit as the first detection surface, and a detection area restriction unit which restricts an area, which can be detected by the second touch type position detection unit, on the second detection surface according to information of the first touch position and information determined in advance. The information determined in advance is data indicating a relation between the first touch position on the first detection surface and the restricted area on the second detection surface.