Optical Keyswitch Layout for Wear-Free Portable Input
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Solution Overview
Problem
Conventional membrane and mechanical keyswitches face issues such as damage from frequent use, poor tactile feedback, wear, and rust, which affect their reliability and suitability for portable electronic devices.
Innovation Solution
An optical keyswitch design utilizing a switch module with a movable shaft, resilient member, and a circuit board with an emitter and receiver, where the optical signal intensity changes with the shaft's movement, triggering a signal and providing improved tactile feedback and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If membrane circuit is used to generate triggering signal, then the keyswitch can be triggered when keycap is pressed, but the membrane circuit is easily damaged and difficult to repair when frequently used or operated by improper forces
Solution Approach 1:
The patent replaces the mechanical membrane circuit with an optical detection system consisting of an emitter and a receiver. The optical system detects the position of the shaft through light transmission without physical contact, eliminating wear and damage issues associated with mechanical circuits while maintaining the triggering function.
2Ease of operation
If membrane circuit is used for triggering, then the keyswitch can be activated, but the tactile feedback is less significant, which causes the pressing feeling to be poor
Solution Approach 1:
The patent replaces the membrane circuit with an optical detection system that can precisely detect shaft position. This allows for better control and feedback mechanisms to be implemented, improving tactile feedback quality while maintaining structural integrity.
3Reliability
If mechanical keyswitch is used based on metal piece and metal contact conduction, then the keyswitch can be triggered, but the metal piece and metal contact are easily worn out due to operation impact, which reduces the life of the keyswitch
Solution Approach 1:
The patent replaces the mechanical metal contact system with an optical detection system. The emitter and receiver detect shaft position through light transmission without physical contact, eliminating wear from operation impact while reducing structural complexity by removing metal contacts and associated wiring.
4Reliability
If mechanical keyswitch with metal piece and metal contact is used, then the triggering function is achieved, but the metal piece and metal contact are prone to rusty, resulting in poor conduction, which affects the operation stability of the keyswitch
Solution Approach 1:
The patent replaces the metal-based mechanical system with an optical system that uses light transmission for detection. This eliminates the rust and corrosion problems inherent in metal contacts while improving operational stability through contactless detection.
5Adaptability or versatility
If conventional mechanical keyswitch is used, then the triggering function is achieved, but the structure is more complicate and bigger in volume, not suitable for portable electronic devices having higher thinning requirements
Solution Approach 1:
The patent replaces the complex mechanical structure with a compact optical detection system. The emitter and receiver can be positioned close together on the same circuit board, significantly reducing the vertical space requirement and making the keyswitch suitable for thin portable devices while simplifying the overall structure.
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 optical keyswitch offers fast, accurate triggering, enhanced tactile feedback, and reduced space requirements, making it suitable for portable devices while minimizing wear and maintenance issues.
Implementation Method 1
the emitter emits an optical signal along an optical path to the receiver
Implementation Method 2
the movable portion no longer has the first spatial relation with the optical path, the optical signal received by the receiver has a second intensity different from the first intensity
Data Source
AI summary
An optical keyswitch includes a casing having a movable portion, a shaft movably disposed on the casing, a resilient member accommodated in the casing, and a switch module including a circuit board, an emitter, and a receiver. The emitter emits an optical signal along an optical path to the receiver. When the shaft is at a non-pressed position, the movable portion has a first spatial relation with the optical path, and the receiver receives the optical signal of a first intensity. When the shaft moves, in response to a pressing force, to a pressed position, the shaft compresses the resilient member and pushes the movable portion to move, so the movable portion no longer has the first spatial relation with the optical path, the optical signal received by the receiver has a second intensity different from the first intensity, and the switch module is triggered to generate a triggering signal.