Printhead Gap-Based Mist Suction Control in Inkjet Printing

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Solution Overview

Problem

Existing printing technologies face issues with ink mist sticking to the periphery and high energy consumption due to inefficient mist suction control.

Innovation Solution

A printing apparatus with a suction unit that controls mist suction based on the distance between the print medium and discharge head, using an acquiring unit to gather information and a suction control unit to adjust suction accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the suction unit operates continuously to prevent ink mist from sticking to the periphery, then the effectiveness of mist removal is improved, but the energy consumption increases

Engineering Contradiction:

Improveink mist contaminationVSAvoidenergy consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The suction unit's operation is made dynamic by adjusting its driving state based on the gap distance between the discharge head and print medium. When the gap is large (prone to mist generation), the suction unit operates; when the gap is small (less mist generation), the suction unit stops. This dynamic adjustment resolves the contradiction by making mist removal effective only when needed, reducing unnecessary energy consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameter (suction unit driving state) based on the gap distance parameter. By monitoring the gap distance and adjusting the suction unit's operation accordingly, the system optimizes the balance between mist removal effectiveness and energy consumption, avoiding continuous operation regardless of actual mist generation conditions.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If the suction amount is controlled based on printing area ratio, then energy consumption is reduced, but the effectiveness of preventing mist from sticking to the periphery is insufficient

Engineering Contradiction:

Improveenergy consumptionVSAvoidink mist contamination

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The system replaces the printing area ratio parameter with the gap distance parameter as the basis for controlling suction unit operation. The gap distance more directly reflects the actual mist generation risk, allowing the suction unit to operate precisely when needed (large gap) and stop when unnecessary (small gap), thereby improving mist prevention effectiveness while maintaining energy efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The control unit continuously monitors the gap distance between the discharge head and print medium and uses this feedback information to adjust the suction unit's operation. This closed-loop control ensures the suction unit responds appropriately to actual printing conditions, preventing mist contamination while avoiding unnecessary energy consumption during low-risk printing scenarios.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the gap between the discharge head and print medium is increased, then the discharge head can accommodate thicker media, but ink mist generation increases

Engineering Contradiction:

Improvemedia thickness compatibilityVSAvoidink mist generation

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The system converts the harmful effect of increased gap distance (more mist generation) into a beneficial control signal. When the gap is large (necessary for thick media), the control unit activates the suction unit to remove the increased mist. This allows the system to maintain adaptability to various media thicknesses while managing the inevitable mist generation through targeted suction activation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The suction unit provides preliminary anti-action by being activated in advance when a large gap is detected, preventing ink mist from sticking to the periphery before the printing operation begins. This proactive approach allows the system to accommodate thicker media with larger gaps while pre-comparing the increased mist generation issue.

Inventive Principle:

Principle #9Preliminary anti-action

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

Prevents ink mist from sticking to the periphery and reduces energy consumption by optimizing suction unit operation based on distance and print conditions.

Implementation Method 1

a suction unit configured to suck mist on the print medium

Methodology Applied

Scientific EffectSuction: Suction

Data Source

PatentUS20260001332A1Printing apparatus

Publication Date: 2026.01.01 CANON KK

AI summary

A printing apparatus includes a discharging unit configured to discharge a liquid to a print medium, a suction unit configured to suck mist on the print medium, an acquiring unit configured to acquire information about a distance between the print medium and the discharging unit, and a suction control unit configured to control driving of the suction unit based on the information acquired by the acquiring unit. The suction control unit is configured to control presence/absence of driving of the suction unit based on the information.