Projection Display Exhaust Shutter Closure During Power Loss

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Solution Overview

Problem

Existing projection display devices fail to reliably close the exhaust port when the external power source is interrupted, leading to potential dust and insect ingress, especially in dust-prone environments, due to power consumption issues and inefficient shutter closure mechanisms.

Innovation Solution

A projection display device equipped with an electricity storage section and a control section that detects power interruptions, transitioning to a low-power state and driving the shutter to close the exhaust port using stored power, thereby reducing irrelevant power consumption and ensuring reliable closure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the exhaust port is left open during power interruption, then the device can be easily operated, but dust and insects enter the device

Engineering Contradiction:

Improveease of operationVSAvoiddust and insect ingress

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The shutter is automatically closed when power interruption is detected, performing the protective action in advance before dust and insects can enter the device during the power outage period

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses its own electricity storage section to power the shutter closure mechanism, making the protective action self-service without requiring external power or additional manual intervention

Inventive Principle:

Principle #25Self-service

2Extent of automation

If the exhaust port is closed using a drive motor, then the shutter can be actuated, but it takes time to completely close the exhaust port

Engineering Contradiction:

Improveautomated shutter closureVSAvoidclosure time

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The patent replaces the drive motor with a spring mechanism that uses elastic potential energy to rapidly actuate the shutter, substituting a slow mechanical motor-driven system with a faster spring-driven mechanical system

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The spring mechanism stores energy periodically during device operation and releases it rapidly when needed, creating a periodic action that enables fast shutter closure without continuous power supply

Inventive Principle:

Principle #19Periodic action

3Temperature

If power is supplied to the cooling device after power interruption, then cooling can be performed, but power is consumed before the exhaust port is closed

Engineering Contradiction:

Improvecooling functionVSAvoidpower consumption

Core Design Contradiction:

TemperatureVSUse of energy by moving object

Solution Approach 1:

The shutter is closed first as a preliminary action before the cooling device is activated, ensuring the exhaust port is sealed before any power-consuming cooling operation begins

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The spring mechanism pre-stores mechanical energy to ensure rapid shutter closure is available beforehand, cushioning against the risk of power consumption occurring before port closure

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Reliability

If the electricity storage section has large capacity, then the shutter can be reliably closed, but the device size and cost increase

Engineering Contradiction:

Improvereliable shutter closureVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The spring mechanism replaces the need for large-capacity electricity storage by using mechanical potential energy, dramatically reducing the volume and cost of energy storage components while maintaining reliable shutter closure

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the energy storage parameter from electrical energy (capacitors/batteries) to mechanical energy (spring), fundamentally altering the physical parameters of the energy storage system to achieve compact size

Inventive Principle:

Principle #35Parameter changes

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 allows for reliable closure of the exhaust port during power outages, preventing dust and insect ingress, reducing power consumption, and optimizing storage capacity, leading to a cost-effective and durable solution.

Implementation Method 1

an electricity storage section (22B) that stores power from the external power source and supplies the stored power as operating power when the external power source is interrupted

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

an exhaust port shutter driving section (49) that drives the exhaust port shutter (32) so that it is closed

Methodology Applied

Scientific EffectElectromagnetism: Electromagnet

Data Source

PatentUS8740392B2Projection display device and method for controlling the same

Publication Date: 2014.06.03 SEIKO EPSON CORP

AI summary

An electricity storage section that stores power from an external power source and supplies the stored power as operating power is provided, and, when an interruption of the external power source to a projection display device is detected, control to reduce the power consumption of a device main body and control to drive an exhaust port shutter so that it is closed by the power supplied from the electricity storage section are performed.