Tape Printer Key Protrusion Design for Accidental Input Prevention
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Solution Overview
Problem
Hand-held tape printing apparatuses lack design features to prevent accidental operation of power and print keys, leading to unintended power shutdowns or premature print executions during character string input or editing operations.
Innovation Solution
The design incorporates operation keys with varying protrusion heights, where power and print keys have lower protrusions than other keys, and are surrounded by frame members to minimize accidental activation, while character keys have higher protrusions for easier access and enhanced tactile experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operation keys have uniform protrusion heights, then the structure is simple and easy to manufacture, but accidental operation of power and print keys cannot be prevented
Solution Approach 1:
The patent applies local quality by differentiating the protrusion heights of different keys. Power keys and print keys have lower protrusion heights (first level) compared to character keys (second level). This local differentiation prevents accidental operation of critical keys while maintaining ease of operation for character input, resolving the contradiction between reliability and structural simplicity.
2Reliability
If power key and print key protrusion height are reduced, then accidental operation is prevented, but key operability may be reduced
Solution Approach 1:
The patent segments the keys into multiple levels based on their functional requirements. Power keys and print keys are placed at a lower protrusion level to prevent accidental activation, while character keys are placed at a higher level for easy access during text input. This segmentation allows each key type to have optimal characteristics for its specific function, balancing reliability and ease of operation.
3Ease of operation
If character keys have high protrusion height, then operability during character string input is improved, but tactile experience may be reduced
Solution Approach 1:
The patent applies local quality by making the key top surface of character keys convex rather than flat or concave. This convex surface reduces the contact area with the finger, providing enhanced tactile feedback and experience while maintaining the high protrusion height necessary for easy character input operability.
Data Source
AI summary
A tape printing apparatus includes an operation surface and a plurality of operation keys protruding from the operation surface. The operation keys include first keys and second keys that protrude less than the first keys from the operation surface, and the second keys include at least one of a power key and a print key.