Hands-Free Sheet Dispenser Charge Path for Stable Hand Sensing
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Solution Overview
Problem
Metallic surfaces in hands-free dispensers can interfere with capacitive hand sensor performance, leading to decreased sensitivity, hypersensitivity, spontaneous shutdown, and uncontrolled dispensing due to static electricity and double feeding of absorbent sheets.
Innovation Solution
A conductive path is established between interfering metal surfaces and a charge receiver positioned remotely from the hand sensor, using a conductive wire or element connected to the metal surfaces and the battery compartment, which draws charge away from these surfaces, improving sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a nickel-plated metallic outer surface is used on the dispenser cover, then the dispenser has an attractive appearance and structural integrity, but the capacitive hand sensor performance is adversely affected resulting in decreased sensitivity, hypersensitivity, and spontaneous shutdown
Solution Approach 1:
A conductive element is introduced as an intermediary between the nickel-plated metallic cover and the capacitive hand sensor. This conductive element provides a controlled electrical path that prevents static charge accumulation on the cover surface while maintaining the desired metallic appearance and structural integrity of the dispenser cover.
Solution Approach 2:
The electrical properties of the dispenser cover system are modified by adding the conductive element, which changes the static charge characteristics of the nickel-plated surface. This parameter change allows the cover to maintain its aesthetic and structural properties while eliminating the harmful electrostatic effects that interfere with sensor operation.
2Strength
If metallic surfaces are used in the dispenser, then the dispenser has durability and aesthetic appeal, but static electricity accumulates on metal surfaces causing double feeding and uncontrolled dispensing
Solution Approach 1:
The conductive element acts as a mediator that provides a controlled path for static charge dissipation from the metallic surfaces. This allows the dispenser to retain its durable metallic construction while preventing the accumulation of harmful static electricity that causes operational failures.
Solution Approach 2:
The conductive element converts the potentially harmful static charge accumulation into a beneficial controlled electrical discharge path. By providing this controlled path, the metallic surfaces continue to provide durability and aesthetics while the static electricity is harmlessly dissipated, preventing double feeding and uncontrolled dispensing.
3Volume of moving object
If the hand sensor is positioned close to the metallic cover for compact design, then the dispenser has compact dimensions, but the metallic cover interferes with sensor detection accuracy
Solution Approach 1:
The conductive element serves as an intermediary that electrically connects the metallic cover to a charge receiver, thereby eliminating the electrostatic interference that would otherwise prevent accurate sensor detection. This allows the sensor to be positioned close to the cover for compact design while maintaining detection accuracy.
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 solution enhances hand sensor performance by reducing interference from metallic surfaces, preventing spontaneous shutdowns and uncontrolled dispensing, and maintaining reliable operation of the dispenser.
Implementation Method 1
A conductive path is established between interfering metal surfaces and a charge receiver positioned remotely from the hand sensor, using a conductive wire or element connected to the metal surfaces and the battery compartment, which draws charge away from these surfaces
Implementation Method 2
hands-free dispensers utilizing capacitive proximity sensors for hand detection
Data Source
Figure 1~3
AI summary
A hands-free dispenser for dispensing lengths of absorbent sheet products, includes: a dispenser body containing a dispensing mechanism; a hand sensor for detecting the presence of a user's hand in the vicinity of the dispenser; an elongated metallic conductive element having a proximate end in electrical communication with at least one metal surface of the dispenser positioned at a first location relative to the hand sensor, and a distal end in electrical communication with at least one charge receiver positioned at a second location relative to the hand sensor, the second location being at a greater distance from the hand sensor than the first location.