Increase of Stopper Position Tolerance Using a TACT Switch™ with Over-Travel
The TACT Switch™ lineup includes middle-stroke types, with a stroke (travel) roughly between 0.4 and 0.9mm. A feature of middle-stroke types is that when an elastic rubber stem is used, there is a pre-stroke prior to the moving contact being pushed, and over-travel after the moving contact is fully pushed (see diagram below). The stroke influences the feel of the switch when pushed.
Issue with Existing TACT Switch™ Products
Stoppers need to be incorporated into the TACT Switch™ housing to prevent damage when too heavy a load is applied to the circuit board to which the TACT Switch™ is mounted. Different types of variations, including variations of the TACT Switch™, may reduce the positional tolerance of the stoppers.
Solution Case Example
Active use of over-travel, a feature of middle-stroke type TACT Switch™ models, made it possible to increase the tolerance of the stopper position setting by the amount of the deflection of the rubber stem.
Solution Benefits
- Larger design tolerance for stoppers inside the housing
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The over-travel zone can be used to increase the tolerance of the TACT Switch™ housing design.
- Adjustment of push feel
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Over-travel allows adjustment to the feeling of a hard stop after the TACT Switch™ is fully pushed.
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