Control Stem Segmentation for Wear-Resistant Timepiece Switching
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Solution Overview
Problem
Existing control devices for portable objects, such as timepieces, face reliability and durability issues due to friction-induced wear between the control stem and electrical contacts, leading to decreased performance and increased manufacturing costs when using abrasion-resistant coatings.
Innovation Solution
A control device with a control stem that moves axially between stable and unstable positions, featuring a distinct actuation element and flexible electrical switching elements, which separates mechanical and electrical contact zones to prevent wear, ensuring robust and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a layer of abrasion-resistant material is applied to the contact zones of the control stem and electrical circuit, then the durability and reliability of the control device is improved, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The control stem is divided into two distinct functional zones: an actuation zone that engages with the flexible electrical switching element to trigger circuit changes, and a separate galvanic contact zone that maintains electrical connection. This segmentation allows the actuation surface to be hard and耐磨 while the contact surface can be softer and more conductive, eliminating the need for complex abrasion-resistant coatings on contact zones.
Solution Approach 2:
Different materials and surface properties are applied to different zones of the control stem. The actuation zone uses a hard, abrasion-resistant material optimized for mechanical engagement, while the galvanic contact zone uses a material optimized for electrical conductivity and galvanic bonding. This local differentiation resolves the contradiction by allowing each zone to have optimal properties without requiring complex manufacturing processes across the entire component.
2Duration of action of stationary object
If abrasion-resistant materials are used to protect contact zones, then the service life of the control device is extended, but the manufacturing cost increases
Solution Approach 1:
The control stem is divided into two distinct functional zones: an actuation zone that engages with the flexible electrical switching element to trigger circuit changes, and a separate galvanic contact zone that maintains electrical connection. This segmentation allows the actuation surface to be hard and耐磨 while the contact surface can be softer and more conductive, eliminating the need for complex abrasion-resistant coatings on contact zones.
Solution Approach 2:
Different materials and surface properties are applied to different zones of the control stem. The actuation zone uses a hard, abrasion-resistant material optimized for mechanical engagement, while the galvanic contact zone uses a material optimized for electrical conductivity and galvanic bonding. This local differentiation resolves the contradiction by allowing each zone to have optimal properties without requiring complex manufacturing processes across the entire component.
3Reliability
If hard abrasion-resistant materials are used on contact zones, then wear resistance is improved, but compatibility with skin-contact portable objects deteriorates due to safety concerns
Solution Approach 1:
The control stem is divided into two distinct functional zones: an actuation zone that engages with the flexible electrical switching element to trigger circuit changes, and a separate galvanic contact zone that maintains electrical connection. This segmentation allows the actuation surface to be hard and耐磨 while the contact surface can be softer and more conductive, eliminating the need for complex abrasion-resistant coatings on contact zones.
Solution Approach 2:
Different materials and surface properties are applied to different zones of the control stem. The actuation zone uses a hard, abrasion-resistant material optimized for mechanical engagement, while the galvanic contact zone uses a material optimized for electrical conductivity and galvanic bonding. This local differentiation resolves the contradiction by allowing each zone to have optimal properties without requiring complex manufacturing processes across the entire component.
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
The solution enhances the durability and reliability of the control device by isolating the contact zones from friction, thereby extending the lifespan of the device and reducing manufacturing costs while maintaining effective electronic function control.
Implementation Method 1
detect the actuation of the control stem via the establishment of a galvanic contact by friction between a contact zone of this control stem and a corresponding electrical contact zone of an electrical circuit
Implementation Method 2
an actuation element capable of cooperating via friction with an electrically conductive switching element in order to force this switching element to establish a galvanic contact
Data Source
AI summary
A device for controlling at least one electronic function of a portable object, in particular a timepiece, includes a control stem capable of moving axially between at least a first and a second stable position, or between at least a stable position and an unstable position. The control device also includes an actuation element made from an electrically insulating material rigidly connected to the control stem, as well as at least one flexible electrical switching element provided to be mechanically actuated by the actuation element when the control stem is moved axially, the at least one flexible electrical switching element being capable of moving between a closing position in which the at least one flexible electrical switching element closes an electrical circuit of the control device, and an opening position in which the at least one flexible electrical switching element opens the electrical circuit.