Medium Issuing Device Code Printing Speed Control
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Solution Overview
Problem
Conventional card issuing systems struggle to print small codes with high precision, particularly when the resolution is low, leading to unrecognizable bar-codes when imaged by smartphones.
Innovation Solution
A medium issuing device with a conveyance mechanism and printing part that acquires enlarged printing data and controls the driving speed to a lower speed according to the enlargement ratio, allowing for precise printing of small codes by enlarging the data in the conveyance direction and maintaining normal speed for other data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the printing resolution is increased to print small codes with high precision, then the code recognition accuracy is improved, but the printing speed is reduced
Solution Approach 1:
The printing process is divided into two distinct modes: high-resolution mode for code data and normal-resolution mode for other data. The control part identifies code data and applies different printing parameters selectively, segmenting the printing task by data type rather than applying a uniform resolution to all content.
Solution Approach 2:
Different printing qualities are applied to different parts of the printing data. Code data receives high-resolution printing with enlarged dimensions and reduced conveyance speed, while non-code data is printed at normal resolution and speed. This local differentiation ensures code precision without sacrificing overall printing efficiency.
2Quantity of substance
If the code size is reduced to fit more information on the medium, then the information density is improved, but the code becomes unrecognizable when imaged by smartphones
Solution Approach 1:
The printing process utilizes the time dimension by controlling the conveyance speed of the medium. By slowing down the medium conveyance speed during code printing, the printing head can deposit ink with higher precision even though the code dimensions are reduced. This temporal adjustment compensates for the spatial reduction, maintaining code recognizability while increasing information density.
3Measurement precision
If the printing speed is reduced to improve code printing precision, then the code recognition rate is improved, but the overall operational efficiency is reduced
Solution Approach 1:
The printing process is segmented into high-speed printing for non-code data and low-speed printing for code data. The control part identifies code portions and adjusts conveyance speed only during those segments, maintaining normal speed for the rest of the printing task. This selective speed adjustment minimizes overall printing time while ensuring code precision.
Solution Approach 2:
Different printing speeds are applied locally to different data types. Code data is printed at reduced conveyance speed to ensure precision, while other data is printed at normal speed. This localized speed control ensures code recognizability without significantly impacting overall printing efficiency.
Data Source
AI summary
A medium issuing device for issuing a medium includes a drive part which drives a conveyance mechanism for conveying the medium in a conveyance passage, a printing part which reads out printing data and prints on the medium according to drive by the drive part, and a control part which acquires enlarged printing data when code data are included in the printing data, the enlarged printing data being enlarged in a conveyance direction of the medium with respect to an original size which do not include the code data, and the control part controls a driving speed of the drive part to a lower speed than a normal driving speed according to an enlargement ratio at least in a portion of the code data.