Serial Inkjet Printer Mode Switching for Large-Document Downsizing

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Solution Overview

Problem

Serial inkjet printers face challenges in maintaining image quality when printing large documents at reduced sizes, particularly when switching to high-speed modes, leading to deteriorated text definition and line reproducibility due to reduced ink droplet size and increased scan rates.

Innovation Solution

The printer automatically switches from a high-speed mode to a high-quality mode based on document size and reduction ratio thresholds, adjusting ink droplet size and scanning density to prevent image quality deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high-speed printing mode is used, then printing speed is improved, but image quality deteriorates

Engineering Contradiction:

Improveprinting speedVSAvoidimage quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent implements dynamic mode switching between high-speed and high-quality printing modes based on real-time analysis of document characteristics (document size and reduction ratio). The control unit automatically transitions between modes to optimize both printing speed and image quality according to the specific printing task, making the system adaptive rather than static.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key printing parameters (ink droplet size and scanning density) based on the selected mode. In high-quality mode, smaller ink droplets and higher scanning density are used to maintain image quality, while in high-speed mode, larger droplets and lower density enable faster printing. This parameter adjustment resolves the contradiction between speed and quality.

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If document size is large and reduction ratio is small, then output image size is large, but printing time increases

Engineering Contradiction:

Improveoutput image sizeVSAvoidprinting time

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The control unit dynamically evaluates the relationship between document size and reduction ratio, and automatically switches to high-speed mode when the output image size exceeds the threshold. This dynamic adaptation allows the system to prioritize printing speed for large output images while maintaining quality for smaller images.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If automatic mode selection is implemented, then ease of operation is improved, but device complexity increases

Engineering Contradiction:

Improveautomatic mode selectionVSAvoidcontrol logic

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The control unit uses straightforward parameter comparisons (document size threshold and reduction ratio threshold) to determine mode selection. By basing the automatic selection on clear, quantifiable parameters rather than complex algorithms, the system achieves ease of operation with manageable complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250284917A1Serial inkjet printer, recording medium storing program code, and printing system

Publication Date: 2025.09.11 RICOH CO LTD

AI summary

A serial inkjet printer includes circuitry configured to select a printing mode according to a first result of comparison of a document size in image data with a first threshold and a second result of comparison of a reduction ratio of an image size of an output image from the document size with a second threshold, and downsize the image data at the reduction ratio in the printing mode to print the output image.