Dual-Projection Push Switch Structure for Wear-Resistant Overtravel
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Solution Overview
Problem
Existing push switches face issues with undesirable wear on projections due to the use of soft materials for overtravel operations, compromising durability and the realization of enhanced tactile feedback.
Innovation Solution
A pressing operation unit with a dual-projection design, where the first projection is softer and the second projection is harder, allowing for differential material properties to enhance durability and enable overtravel operations while providing tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a soft material is used for the projection receiving the pressing operation to achieve overtravel operation through elastic deformation, then the overtravel operation is enabled, but undesirable wear occurs on the projection
Solution Approach 1:
The operating member is designed with two projections having different material properties: a first projection made of soft material that elastically deforms to enable overtravel operation, and a second projection made of hard material that resists wear during pressing operations. This local differentiation of material qualities allows each projection to fulfill its specific functional requirement without compromising the other.
Solution Approach 2:
The operating member is constructed as a composite structure with two projections made of different materials. The first projection uses a soft, elastic material to provide overtravel operation, while the second projection uses a hard, wear-resistant material. This composite approach combines the advantages of both material types within a single component.
2Reliability
If a hard material is used for the projection to enhance durability, then wear resistance is improved, but overtravel operation cannot be achieved
Solution Approach 1:
The operating member is designed with two projections having different material properties: a first projection made of soft material that elastically deforms to enable overtravel operation, and a second projection made of hard material that resists wear during pressing operations. This local differentiation of material qualities allows each projection to fulfill its specific functional requirement without compromising the other.
Solution Approach 2:
The operating member is segmented into two distinct projections with different material characteristics. The first projection is dedicated to providing overtravel operation through elastic deformation, while the second projection is dedicated to providing wear-resistant pressing surface. This segmentation allows independent optimization of each projection's material properties.
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 dual-projection design minimizes wear on the harder projection and achieves both enhanced durability and overtravel operations with improved tactile feedback.
Implementation Method 1
a leaf spring member configured to elastically deform in response to the pressing operation, to provide an operating sensation
Implementation Method 2
when a soft material is used for the projection receiving the pressing operation in order to achieve an overtravel operation by utilizing elastic deformation of the projection
Data Source
AI summary
A pressing operation unit includes: an operating member configured to receive a pressing operation from an operator; a leaf spring member configured to elastically deform to provide an operating sensation in response to the pressing operation; and a housing configured to retain the plate spring member, wherein the operating member includes: an insulator configured to cover the housing, a first projection provided on one surface of the insulator, and a second projection that is provided on another surface of the insulator and at a position to face the first projection, and wherein a material of the first projection is different from a material of the second projection.