Irradiation Unit Air Filtration Layout for Stable Cooling

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Solution Overview

Problem

Existing active energy irradiation devices face issues with foreign substances like ink mist clogging filters, leading to reduced air flow and increased temperature of the irradiation unit over time.

Innovation Solution

The device incorporates a filter system with a first filter portion that contacts the partition, deflecting air flow to intersect with the heat conduction member, ensuring uniform air distribution and reducing resistance loss, while a second filter portion maintains air flow efficiency by being thinner than the first, and a skirt portion guides foreign substances to the intake.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a filter is attached to collect foreign substances, then foreign substance entry is suppressed, but air flow rate decreases due to filter clogging

Engineering Contradiction:
Improveforeign substance entryVSAvoidair flow rate
Core Design Contradiction:
Object-affected harmful factorsVSProductivity

Solution Approach 1:

The filter is divided into a first filter portion and a second filter portion with different thicknesses. The first filter portion has greater thickness for enhanced filtration, while the second filter portion has smaller thickness to maintain air flow. This segmentation allows different regions of the filter to serve different functions, resolving the contradiction between filtration effectiveness and air flow maintenance.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different portions of the filter are given different local qualities (thicknesses) according to their functional requirements. The first filter portion uses greater thickness for better foreign substance collection, while the second filter portion uses smaller thickness for lower resistance. This local differentiation allows the filter system to simultaneously achieve good filtration and maintain air flow.

Inventive Principle:
Principle #3Local quality

2Object-affected harmful factors

If filter thickness is increased for better filtration, then foreign substance collection improves, but air flow resistance increases

Engineering Contradiction:
Improveforeign substance collectionVSAvoidair flow resistance
Core Design Contradiction:
Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The filter is segmented into portions with different thicknesses. The first filter portion has greater thickness for improved foreign substance collection, while the second filter portion has smaller thickness for reduced air flow resistance. This segmentation allows the system to achieve both effective filtration and low resistance by distributing different functional requirements across different segments.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The filter system implements local quality differentiation where the first filter portion has greater thickness for enhanced filtration performance, while the second filter portion has smaller thickness for lower resistance. This local optimization allows each region to be tuned for its specific function, resolving the contradiction between filtration effectiveness and energy loss.

Inventive Principle:
Principle #3Local quality

3Temperature

If air flow is deflected to intersect the heat conduction member, then cooling efficiency improves, but device complexity increases

Engineering Contradiction:
Improvecooling efficiencyVSAvoidair introduction unit structure
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The air introduction unit is segmented into functional components: a partition that deflects air flow and a filter assembly. This segmentation allows the air flow deflection function to be separated from the filtration function, making the design more modular and easier to manufacture while achieving the desired cooling efficiency through the deflected air flow path.

Inventive Principle:
Principle #1Segmentation

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

This configuration maintains air flow and cooling efficiency, suppressing the irradiation unit's temperature rise despite prolonged use, extending the device's performance and allowing for timely filter replacement.

Implementation Method 1

a heat conduction member that is disposed in the housing, and is thermally connected to the irradiation unit

Methodology Applied
Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

a filter that is provided between the first opening and the partition, and collects foreign substances contained in the air

Methodology Applied
Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS12508827B2Active energy irradiation device and inkjet printer
Publication Date: 2025.12.30 HAMAMATSU PHOTONICS KK
  • US12508827B2 patent drawing
  • US12508827B2 patent drawing
  • US12508827B2 patent drawing

AI summary

An active energy irradiation device includes a housing, an irradiation unit, a heat conduction member, a first opening that is provided at the housing, and an air introduction unit that deflects air flowing into the housing along a first direction via the first opening to a second direction intersecting the first direction to introduce the air to the heat conduction member. The air introduction unit includes a partition that is provided to face the first opening in the housing, and a filter that is provided between the first opening and the partition, and collects foreign substances contained in the air. The filter includes a first filter portion that is provided on the heat conduction member side to come into contact with the partition without being exposed from the first opening as viewed from the first direction.