Keyboard Instrument Case Edge Peeling Prevention

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Solution Overview

Problem

Conventional keyboard instrument cases face challenges in securely affixing decorative or protective sheet materials, leading to a risk of peeling off, especially at the edges, which compromises both functionality and aesthetics.

Innovation Solution

A case design featuring an exterior member with affixed sheets and an attachment member that biases the exterior member backward, using a resin biasing mechanism to ensure secure attachment and cover the cut ends of the sheets, preventing exposure and peeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sheet material is affixed to exterior member, then decorative/protective function is improved, but peeling risk at edges increases

Engineering Contradiction:

Improvesheet attachment reliabilityVSAvoidpeeling risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The attachment member extends in the thickness direction (third dimension) beyond the exterior member's outer surface. This dimensional extension creates a protective overhang that covers the edge portions of the sheet material, preventing peeling from occurring at the edges while maintaining secure attachment throughout the sheet surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The attachment member serves as an intermediary structure between the exterior member and the sheet material. It provides a protective interface that covers the exposed edges of the sheet material, acting as a mediator that prevents direct exposure and peeling while allowing the sheet to remain securely attached to the exterior member.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If attachment member covers cut ends of sheets, then peeling prevention is improved, but device complexity increases

Engineering Contradiction:

Improvepeeling preventionVSAvoidcase structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The attachment member is integrated with the exterior member as a unified structure. The facing surface of the attachment member is configured to face the second surface of the exterior member, and the projection portion combines the attachment function with the protective covering function in a single integrated component, reducing overall structural complexity while achieving peeling prevention.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The attachment member performs multiple functions simultaneously: it attaches the exterior member to the keyboard instrument body and covers the cut ends of the sheet material to prevent peeling. This multi-functionality reduces the need for separate components, thereby reducing device complexity while achieving both attachment and protection objectives.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230410777A1Case and keyboard instrument

Publication Date: 2023.12.21 CASIO COMPUTER CO LTD

AI summary

A case includes an exterior member including a first surface including an external surface of a first sheet and a second surface connected to the first surface, and an attachment member to which the exterior member is attached, having a facing surface disposed to face the second surface, and arranged in such a manner that a projecting end of the facing surface projects further than the first surface when viewed in cross section.