Flexible Keypad Carrier Membrane for Interstitial Finish Access

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Solution Overview

Problem

The miniaturization of electronic devices, such as wireless communication devices, poses challenges in applying finishes like painting or decoration to the small, closely spaced keys of their keypads, as the reduced dimensions and proximity of keys make it difficult to access and accurately apply finishes to interstitial portions.

Innovation Solution

A flexible carrier membrane is used to position the keys in a convex configuration, allowing for increased angular offsets between adjacent keys, which enables the application of finishes to interstitial portions by bending the membrane around a cylindrical fixture, thereby opening these areas for finish application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If keys are positioned close to one another to reduce device dimensions, then the physical size of the device is reduced, but it becomes difficult to access and accurately apply finishes to interstitial portions of the keys

Engineering Contradiction:

Improvedevice sizeVSAvoidfinish application difficulty

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The patent employs a flexible carrier membrane that can dynamically change its configuration between a first configuration (during finish application) and a second configuration (during normal operation). This dynamic transformation allows the membrane to adapt to different manufacturing and operational requirements, resolving the contradiction between compact device size and ease of finish application.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces an additional dimensional aspect by bending the flexible carrier membrane into a curved or three-dimensional configuration during finish application. This dimensional change creates increased angular offsets between adjacent keys, providing better access to interstitial portions that would otherwise be inaccessible in a flat, compact arrangement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If keys are positioned close to one another to reduce device dimensions, then the physical size of the device is reduced, but the angular offsets between adjacent keys decrease making finish application inaccurate

Engineering Contradiction:

Improvedevice sizeVSAvoidfinish application precision

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The flexible carrier membrane dynamically transforms between configurations to provide increased angular offsets during finish application, ensuring manufacturing precision. After finish application, the membrane returns to its compact second configuration for normal device operation, thus resolving the contradiction between compact size and finish application precision.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent performs the configuration change of the flexible carrier membrane in advance of finish application, positioning the keys with increased angular offsets and better exposure of interstitial portions before the finish application process begins. This preliminary action ensures that finish application can be performed with high precision on compact keypads.

Inventive Principle:

Principle #10Preliminary action

3Stability of the object's composition

If a rigid structure is used to position keys, then structural stability is maintained, but the keys cannot be repositioned to increase angular offsets for finish application

Engineering Contradiction:

Improvekeypad structure stabilityVSAvoidkey repositioning capability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent replaces rigid key positioning structures with a flexible carrier membrane that can be bent and deformed. This flexible membrane maintains structural stability during normal operation while allowing repositioning of keys to increase angular offsets during finish application, thus resolving the contradiction between structural stability and repositioning capability.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The flexible carrier membrane provides dynamic repositioning capability, allowing the keypad structure to adapt between a stable compact configuration for normal use and an expanded configuration with increased angular offsets for finish application. This dynamic behavior resolves the contradiction between structural stability and adaptability.

Inventive Principle:

Principle #15Dynamics

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

This method allows for the application of finishes to small keypad assemblies with closely spaced keys, ensuring even and accurate coverage of interstitial portions, facilitating the assembly of electronic devices with aesthetically enhanced user interfaces.

Implementation Method 1

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS8598476B2Apparatus, and associated method, for applying a finish to a keypad

Publication Date: 2013.12.03 MALIKIE INNOVATIONS LTD

AI summary

A keypad assembly, and an associated method, is constructed in a manner to permit application of a finish, such as a decoration or painting, to any desired portion of the keys of the assembly, including at interstitial portions between adjacent keys. The keypad assembly includes a carrier membrane upon which keys forming a keypad array and key membrane pieces are supported. The carrier membrane is wrapped about a cylindrical fixture to position all portions of the keys in orientations to permit application of the finish thereto.