Push Switch Grooved Contact Surface Design
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Solution Overview
Problem
Push switches with flat contact surfaces are prone to deteriorating electrical properties due to foreign matter entry and accumulation of scraped powder, which affects tactility and reliability.
Innovation Solution
The push switch design incorporates a stationary contact with grooves that divide the contact surface into multiple areas, and enlarging depressions adjacent to the contact areas to prevent powder accumulation, along with inclined connection surfaces to reduce stress concentration and prevent conductive layer damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat contact surface is used, then the structure is simple and easy to manufacture, but foreign matter entry and scraped powder accumulation occur, deteriorating electrical properties
Solution Approach 1:
The contact surface is divided into multiple areas by grooves, transforming a single flat surface into segmented regions. This segmentation prevents foreign matter and scraped powder from accumulating across the entire contact area, thereby maintaining electrical properties while keeping the manufacturing process relatively simple.
Solution Approach 2:
The contact surface is given non-uniform structure through grooves and connection surfaces with different geometries. The grooves create localized regions for powder ejection, while connection surfaces provide localized stress distribution. This local quality variation prevents foreign matter accumulation without requiring complete redesign of the entire contact structure.
2Ease of operation
If excessive force is applied during operation, then the switch can be actuated, but stress concentration damages the conductive layer on the stationary contact
Solution Approach 1:
Connection surfaces are designed with specific geometries (inclined angles, curved surfaces) to locally manage stress distribution. These specially designed regions provide stress relief paths that protect the conductive layer from damage during operation, while maintaining effective force transmission for switch actuation.
Solution Approach 2:
The groove structure and connection surface geometry are designed in advance to prevent stress concentration before it occurs. The grooves provide predetermined stress relief paths and the connection surfaces distribute applied forces, cushioning the conductive layer against damage during normal operation and excessive force events.
3Reliability
If grooves are added to the stationary contact, then foreign matter interference is reduced, but the manufacturing complexity increases
Solution Approach 1:
The contact surface is divided into multiple areas by grooves, transforming a single flat surface into segmented regions. This segmentation prevents foreign matter and scraped powder from accumulating across the entire contact area, thereby maintaining electrical properties while keeping the manufacturing process relatively simple.
4Strength
If connection surfaces with inclined angles are used, then stress concentration is reduced, but the contact area decreases
Solution Approach 1:
Connection surfaces are designed with specific geometries (inclined angles, curved surfaces) to locally manage stress distribution. These specially designed regions provide stress relief paths that protect the conductive layer from damage during operation, while maintaining effective force transmission for switch actuation.
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 design enhances the reliability and stability of electrical properties by minimizing foreign matter interference and powder accumulation, ensuring consistent performance even under excessive force applications.
Implementation Method 1
The movable component is an elastic metal sheet that is curved like a dome that protrudes upward. When the push switch is operated, force is applied to a top surface of the protective sheet. The force is transferred to the movable component. Consequently, the movable component deforms (elastic reversal). If the force ceases to be applied to the protective sheet, the movable component deforms into an original shape (a shape like a dome that protrudes upward) (elastic restoration).
Data Source
AI summary
A push switch includes a stationary contact and a movable contact. The stationary contact includes a base material and a conductive layer that covers the base material. The movable contact is disposed opposite a contact surface of the stationary contact. The movable contact is movable between a first position where the movable contact is in contact with the contact surface and a second position where the movable contact is apart from the contact surface. The stationary contact has a groove that divides the contact surface into a plurality of areas. Connection surfaces connect respective opening edges of the groove with a bottom of the groove. Each of the connection surfaces has a slope that is inclined at acute angle relative to the contact surface.