Inkjet Coating Head Posture for Uniform Recessed Surface Coverage

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Solution Overview

Problem

Existing coating devices struggle to achieve high-quality coating on objects with recessed or protruding portions, leading to uneven application and potential peeling of the coating due to displacement of discharge drops and air flow interference.

Innovation Solution

A coating device with a head that adjusts its posture and discharge amount based on the presence of recessed or protruding portions, using multiple heads with varying discharge sizes and angles to ensure uniform coating, and controlling the discharge gap to prevent air flow interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional inkjet coating device is used on objects with recessed or protruding portions, then the coating process is simple, but the coating quality becomes uneven and peeling occurs

Engineering Contradiction:

Improvecoating qualityVSAvoidcoating device complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The coating device dynamically adjusts the discharge amount of coating material based on the detected surface shape (recessed or protruding portions) in real-time, allowing the same device to adapt to varying surface geometries and maintain uniform coating quality without requiring multiple specialized devices

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The device changes the discharge parameters (amount, angle, position) of the coating material according to the detected surface features, enabling precise control of coating application on complex surfaces while maintaining a relatively simple device structure

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the discharge gap is increased to cover recessed portions, then the coating coverage improves, but air flow interference increases causing discharge drop displacement

Engineering Contradiction:

Improvecoating uniformityVSAvoidair flow interference

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The device applies different discharge strategies for different regions: for recessed portions, it increases discharge amount and adjusts angle locally, while for protruding portions, it reduces discharge amount, creating a localized solution that maintains overall coating uniformity without excessive air flow interference

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The device replaces mechanical adjustment of the entire coating head with electronic control of individual nozzle discharge parameters, allowing precise local adjustments without changing the physical discharge gap, thereby avoiding air flow interference while maintaining coating uniformity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If multiple heads with different discharge sizes are used, then coating adaptability to complex surfaces improves, but device complexity increases

Engineering Contradiction:

Improvesurface adaptabilityVSAvoidnumber of heads

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

A single coating head is designed to perform multiple functions by electronically controlling different nozzles to discharge varying amounts of coating material, replacing the need for multiple specialized heads and simplifying the device structure while maintaining high surface adaptability

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Improves coating quality by ensuring uniform application on complex surfaces, reducing peeling and enhancing environmental strength of the coated object.

Implementation Method 1

a head (10) that coats a to-be-coated object (30) by discharging coating material in the form of liquid or aerosol from a plurality of discharge holes (11) of a nozzle surface (12)

Methodology Applied

Scientific EffectInkjet discharge:

Implementation Method 2

The coating material is a mixture containing a volatile component and a nonvolatile component... the nonvolatile component forms a coating film after the volatile component evaporates

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentEP4023344B1Painting device, painted film, and painting method

Publication Date: 2025.11.12 KYOCERA CORP

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Figure 5A~6

AI summary

A coating device (1) coats a to-be-coated object (30) including a recessed portion (51) extending in a first direction. The coating device (1) includes a head (10), an arm (21), and a controller (41). The head (10) includes a nozzle surface (12). The arm (21) holds the head (10). The controller (41) controls movement of the head (10) via the arm (21). The controller (41) moves the head (10) in the first direction while causing the nozzle surface (12) and the recessed portion (51) to face each other in a posture in which a length of a first component along the first direction of the head (10) is larger than a length of a second component of the head (10) intersecting the first component.