Keyboard Dome Stiffener Assembly for Tactile Feedback and Dust Protection
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Solution Overview
Problem
Conventional mobile device keyboards face challenges with limited space, leading to compromised size, tactile feedback, and durability, making it difficult for users to sense switch closures and enter input effectively due to the introduction of dust and moisture through venting mechanisms.
Innovation Solution
A keyboard dome stiffener assembly comprising a circuit board, a dome sheet, and a stiffener with air cavities and venting apertures, which enhances tactile feedback by controlling air movement between the dome switches and air spaces, providing a firmer click feel and improved durability through sealed venting apertures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If venting mechanisms are added to dome switches to improve tactile feedback, then tactile feedback is enhanced, but dust and moisture ingress increases
Solution Approach 1:
A hydrophobic coating is applied to the venting aperture to create an intermediary layer that selectively blocks moisture and dust while allowing air passage. This coating acts as a mediator that permits the venting function to operate while preventing harmful substance ingress.
Solution Approach 2:
The venting aperture structure utilizes porous or micro-perforated materials that allow air flow for tactile feedback while the hydrophobic treatment prevents liquid moisture penetration. The porous structure enables selective permeability based on substance type.
2Volume of moving object
If the size of mobile devices is reduced, then portability is improved, but switch panel functionality and feedback are compromised
Solution Approach 1:
The invention changes the physical parameters of the venting aperture by applying hydrophobic coating, which alters the surface energy characteristics. This allows the same aperture to perform dual functions: allowing air passage for tactile feedback while blocking moisture, enabling compact design without sacrificing feedback quality.
Solution Approach 2:
The venting aperture with hydrophobic coating serves multiple functions simultaneously: it provides air flow paths for tactile feedback, prevents moisture ingress, and blocks dust particles. This multi-functionality allows compact switch panel design without compromising operational quality.
3Area of stationary object
If dome switches are made smaller to fit limited space, then space utilization is improved, but force required to actuate keys increases
Solution Approach 1:
The invention utilizes pneumatic principles by creating controlled air flow paths through the hydrophobically coated venting aperture. When a key is pressed, air flows through the aperture providing pneumatic assistance that reduces the force required to actuate the switch, enabling smaller dome switches with lower actuation force.
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 assembly reduces the force required to actuate keys, enhances tactile feedback, and prevents dust and moisture ingress, resulting in a more reliable and user-friendly input experience on mobile devices.
Implementation Method 1
A keyboard dome stiffener assembly includes a circuit board, a dome sheet, and a stiffener. The stiffener defines a plurality of cutouts which provide an air cavity between the circuit board and the stiffener. Each air cavity is in fluid communication with at least one air space
Data Source
AI summary
A keyboard dome stiffener assembly includes a circuit board having a plurality of dome pads that each defines a venting aperture, a dome sheet disposed over the circuit board, and a stiffener disposed beneath the circuit board that defines a plurality of cutouts corresponding to each venting aperture. The dome pads correspond to a key of an associated keyboard to be assembled with the keyboard dome stiffener assembly. The dome sheet forms an air space associated with each dome pad that is in fluid communication with the corresponding venting aperture. The cutouts of the stiffener provide an air cavity between the circuit board and the stiffener. Each air cavity is in fluid communication with an air space, and when one of the keyboard keys is depressed, some of the air in the air space travels between the air space of the keyboard to the corresponding air cavity.