White Printing Area on Mobile Phone Cases With Shielded Spray Control

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Solution Overview

Problem

Existing mobile phone case spraying devices lack effective protective measures to limit and isolate the paint spraying range, leading to paint being sprayed onto larger areas of other components, increasing cleaning difficulty and reducing the effect of printing patterns due to color similarity.

Innovation Solution

A mobile phone case with a white printing area and a printing device featuring a shielding assembly with protective covers and a triple-nozzle tube system, which includes an electric telescopic rod for precise spraying and a replacement assembly for easy nozzle replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a spraying device is used to apply background color to the mobile phone case surface, then high-precision spraying and various colors/patterns are achieved, but paint is easily sprayed to larger areas of other component surfaces

Engineering Contradiction:

Improvespraying precisionVSAvoidpaint contamination

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by providing different functional characteristics to different parts of the spraying device. The protective cover is designed to be transparent in front of the spray gun to allow observation while blocking paint spray to surrounding areas. The spray gun itself has a specialized structure with a nozzle directed at the mobile phone case surface, creating localized precise spraying while the protective cover creates localized protection zones around other components.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The transparent protective cover acts as an intermediary element between the spray gun and the surrounding components. It mediates by allowing light transmission for observation while blocking paint particles from reaching other components. The cover serves as a physical barrier that separates the spraying zone from the surrounding area, preventing paint contamination without interfering with the spraying process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If paint is sprayed onto other component surfaces, then complete coverage is achieved, but cleaning difficulty increases and production efficiency decreases

Engineering Contradiction:

Improvepaint coverageVSAvoidproduction efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent converts the potential harm of paint spray dispersion into a benefit by using the transparent protective cover to contain and redirect the spray. The cover transforms what would be harmful paint contamination into controlled paint application on the intended surface. By blocking paint from reaching unwanted areas, the system eliminates the need for extensive cleaning operations, thereby improving production efficiency while maintaining proper paint coverage.

Inventive Principle:

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

3Ease of manufacture

If the mobile phone case surface has random color, then natural appearance is maintained, but printing pattern effect is reduced due to color similarity

Engineering Contradiction:

Improvesurface appearanceVSAvoidpattern printing quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by first applying a white background layer to the mobile phone case surface before printing the pattern. This preliminary white coating creates a high-contrast base that enhances the visibility and quality of subsequent pattern printing. The white background is applied uniformly across the surface area where the pattern will be printed, ensuring that the pattern stands out clearly regardless of the original surface color.

Inventive Principle:

Principle #10Preliminary 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

The solution effectively limits paint spray to the mobile phone case surface, enhances pattern fidelity, and improves cleaning efficiency by minimizing contamination and simplifying nozzle replacement.

Implementation Method 1

The spray gun, under control by the control system, sprays paint onto the surface of the mobile phone case

Methodology Applied

Scientific EffectSpray: Fluid Spray

Implementation Method 2

a triple-nozzle tube is arranged at a bottom of the conveying tube, an outer wall of the triple-nozzle tube is provided with a replacement assembly

Methodology Applied

Scientific EffectElectromagnetic actuation:

Data Source

PatentUS12508616B1Mobile phone case with white printing area and printing device for same

Publication Date: 2025.12.30 QIAO XIAOFAN

AI summary

Disclosed is a mobile phone case with a white printing area and a printing device for same, including a mobile phone case and a workbench. A top of the mobile phone case is fixedly connected to a spraying panel. An inner wall of the workbench is fixedly connected to a placement table, the placement table provides a placement area for the mobile phone case, a shielding assembly is arranged inside the workbench, a top of the workbench is fixedly connected to a raw material box, the raw material box is internally fixedly connected to a conveying tube, a triple-nozzle tube is arranged at a bottom of the conveying tube, and an outer wall of the triple-nozzle tube is provided with a replacement assembly. Protective covers on both sides limit and isolate a spraying range of an outer wall of the mobile phone case.