Rear Projection Screen Synchronization via Link Shaft

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Solution Overview

Problem

Conventional projection type image display devices have complex structures requiring numerous parts and time-consuming assembly, making maintenance and fine adjustments difficult, especially when arranging multiple units, which can lead to damage from contact between neighboring screens.

Innovation Solution

A simplified projection type image display device design featuring a screen unit with right and left slide mechanisms linked by a shaft for synchronized movement, along with a lock mechanism and engagement system, allowing for easy adjustment and operation from the front surface, reducing the need for frequent part changes and minimizing contact between units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional rear projection type image display device uses a complex structure with numerous parts for screen unit attachment and detachment, then the screen unit can be securely attached and maintained, but the assembly time increases and the structure becomes complicated

Engineering Contradiction:

Improvescreen unit attachment reliabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the screen unit attachment and detachment operations into a single integrated action. The screen unit is designed to be simultaneously attached to both the upper and lower casings through one insertion motion, eliminating the need for separate attachment steps for each casing. This merging of operations reduces assembly time and simplifies the overall structure while maintaining secure attachment.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The screen unit is designed with universal attachment features that allow it to be securely mounted to both upper and lower casings using the same mechanism. The engagement structure serves multiple functions: it provides secure attachment, enables easy detachment, and ensures proper positioning all through a single design, reducing the need for multiple specialized parts.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a projection type image display device is designed with many parts for screen unit attachment, then the screen unit can be securely fixed, but the assembly time and cost increase

Engineering Contradiction:

Improvescreen unit fixationVSAvoidassembly time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent merges multiple fixation operations into a single action. The screen unit is designed with engagement protrusions that simultaneously engage with recesses in both upper and lower casings during one insertion motion, eliminating the need for multiple separate fixation steps and reducing assembly time while maintaining secure fixation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The screen unit is pre-designed with specific engagement features (protrusions and recesses) that are already positioned correctly for immediate engagement with the casings. This preliminary configuration of the attachment features allows for rapid assembly without requiring additional adjustment or multiple steps during the assembly process.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the screen unit is attached with a complicated structure, then the screen unit can be securely mounted, but fine adjustment becomes difficult

Engineering Contradiction:

Improvescreen unit mounting securityVSAvoidfine adjustment capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent incorporates an adjustment mechanism that allows the screen unit to be dynamically repositioned after initial mounting. The engagement structure includes movable components that enable fine adjustment of the screen unit's position while maintaining secure attachment, allowing operators to make precise positioning adjustments without compromising mounting security.

Inventive Principle:

Principle #15Dynamics

4Area of stationary object

If multiple projection type image display devices are arranged closely, then space utilization improves, but neighboring screen units may damage each other through contact

Engineering Contradiction:

Improvespace utilizationVSAvoidscreen unit contact damage

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent designs the screen unit engagement structure to automatically prevent harmful contact between adjacent devices. The engagement protrusions and recesses are configured to maintain proper spacing and alignment, creating a mechanical barrier that prevents neighboring screen units from contacting each other even when devices are arranged closely together, thus preventing damage before it can occur.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS8651670B2Projection type image display device

Publication Date: 2014.02.18 MITSUBISHI ELECTRIC CORP

AI summary

A projection type image display device of the present invention includes: a screen unit with a screen onto which images are projected; a projection unit for projecting images onto the screen from the rear surface of the screen; right and left slide mechanisms as a pair for supporting the screen unit in a manner that allows the screen unit to move in a direction approximately normal to the screen; and a link shaft for linking the right and left slide mechanisms, and for moving the right and left mechanisms in synchronization with each other.