Keypad Edge Key Hook Locking Mechanism
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Solution Overview
Problem
Film-in-plastic (FIP) or in-mould-decoration (IMD) keypads in portable electronic devices are prone to accidental removal and lateral movement, leading to bulging issues due to insecure attachment and lack of effective locking mechanisms.
Innovation Solution
A keypad assembly with edge keys featuring a hook or locking mechanism coupled with the housing to prevent uprooting and additional hooks connecting the housing with the keypad to limit lateral movement, ensuring secure attachment and preventing bulging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If FIP or IMD keypads are used in portable electronic devices, then the device can have integrated buttons or keyboards for user interface, but the keys are susceptible to accidental removal and lateral movement causing bulging
Solution Approach 1:
The keypad is divided into individual key elements that can be separately secured to the housing. Each key can be independently attached using discrete attachment elements, allowing for targeted securing without requiring the entire keypad assembly to be complex or difficult to manufacture.
Solution Approach 2:
The attachment elements are integrated within the housing structure, with features such as recesses and protrusions that nest together to secure the keys. The housing contains embedded attachment mechanisms that work together with corresponding features on the keys to create a secure connection.
2Ease of manufacture
If simple attachment methods are used for the keypad, then manufacturing is easier, but the keys can be easily pried from the keypad
Solution Approach 1:
The keypad utilizes a flexible membrane or film structure that allows for simple integration into the housing while maintaining key functionality. This flexible layer can be easily manufactured and assembled, yet when combined with the attachment elements, provides sufficient holding strength to prevent key removal.
Solution Approach 2:
The attachment system combines multiple materials with different properties - the flexible keypad material, the rigid housing material, and intermediate attachment elements - to achieve both ease of manufacture and strong attachment. The composite structure allows each material to contribute its optimal properties to the overall assembly.
3Area of stationary object
If keys extend to the edges of the device, then the keypad provides comprehensive coverage for user interaction, but edge keys are particularly susceptible to being removed or pried
Solution Approach 1:
The attachment elements are strategically positioned at different locations across the keypad, with particular emphasis on edge keys that are more vulnerable to removal. The housing includes specific attachment features at perimeter locations that provide enhanced securing for edge keys compared to interior keys.
4Stability of the object's composition
If the keypad is securely attached to prevent lateral movement, then bulging is prevented, but the attachment mechanism may increase device complexity
Solution Approach 1:
The attachment function is merged with the existing housing and keypad structures rather than adding separate, complex attachment mechanisms. The housing and keypad are designed with integrated attachment features that accomplish the securing function while maintaining a simple overall device architecture.
Data Source
AI summary
An electronic device includes an interlocking mechanism for fixing a keypad to a housing of the device. The housing is coupled with the keypad such that the keys may extend to the edges of the electronic device and the edge keys are secured against being removed from the keypad. The edge keys may include a hook or locking mechanism coupled with the housing to prevent uprooting of the edge keys. Another set of hooks or lockings connect the housing with the keypad to prevent bulging of the keypad and to limit lateral movement between the keys or the keypad with the housing.