Editorial
travel. But in this age of smartphones, and with the proliferation of electronic gadgets, consumer tastes have evolved. They now demand smaller, more responsive tactile switches that still supply the same haptic experience they have been accustomed to.
Nowadays, automotive manufacturers, and the companies producing subsystems such as switch panels for them, often produce detailed specifications for the haptic and acoustic performance of the switches they select to ensure that they conform to the brand identity as well as delivering consistency over time.
There are several factors that define the sound made by a tactile switch, such as dome material and composition, structure and design of the switch body, and how the switch fits into the larger system. Characterising the acoustics of any switch usually involves measuring the audible spectral components of the sound made, using an accurate sound meter in a carefully controlled environment. To achieve this, C&K has invested in a state-of-the-art acoustic chamber with accurate sound evaluation that enables evaluation of individual switches and customer sub-assemblies.
Some integrators are attempting to build tactile switches themselves, fitting domes and membranes to a PCB to optimise the cost compared to a discrete switch. But this approach is fraught with problems. It needs many switches in an array to be cost-effective, specific PCB plating is required, and dust management is another challenge. An off-the-shelf tactile switch is guaranteed to perform to specification (including haptics and acoustics) by the manufacturer, and reliability is assured, as is the sealing of the assembly.
Delivering performance through a holistic approach
Having ensured that the switch selected for the automobile is reliable, meets the ISO 26262 standard and delivers the desired haptic experience for the
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customer, it is vital to ensure that it meets these requirements time after time.
While it is essential that any solution reflects the features and requirements that have been defined or highlighted, it must also meet the cost constraints in order to be commercially viable, as well as meeting the needs of the customer. In this context, “cost” refers to more than just the cost of the component; it also has to include everything needed to integrate the solution, for example connection costs and assembly costs – the so-called “total cost of ownership".
However, this approach to design is only valid if the final design is well controlled in manufacturing so that every single product meets the customer’s needs. In many ways, the manufacturing process is at least as important as the product itself. As designers and manufacturers, we can adapt our processes and optimise our tools and machines to meet the needs of all customers and designs.
In summary, delivering custom solutions is much more than just meeting a specification. To be truly successful you must combine expertise with design excellence, innovative manufacturing engineering, attention to customer expectations and cost control.
In short, a holistic approach to custom switch design is the key to success.
For more information visit:
avnet-abacus.eu/ck-automotive
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