Illumination Optical System Intermittent Drive Mechanism

Solution Overview

Problem

The continuous operation of the driving mechanism in existing illumination optical systems leads to a short service life and increased noise due to abrasion, affecting the overall efficiency and reliability of the system.

Innovation Solution

An illumination optical system where the driving mechanism intermittently moves the irradiation spot of the excitation light over a fluorescent body disposed on a plate, which is wider than the irradiation spot, to reduce wear and tear, thereby extending the service life and minimizing noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the driving mechanism continuously operates to move the irradiation spot over the fluorescent body, then the light emission efficiency is maintained, but the service life of the driving mechanism decreases and noise increases

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidservice life of driving mechanism

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The driving mechanism operates periodically rather than continuously. The control unit activates the driving mechanism only at predetermined time intervals to move the irradiation spot to different positions on the fluorescent body, then keeps it stationary during non-operational periods. This periodic operation maintains light emission efficiency while significantly extending the service life of the driving mechanism and reducing noise.

Inventive Principle:

Principle #19Periodic action

2Productivity

If the driving mechanism continuously operates to move the irradiation spot over the fluorescent body, then the light emission efficiency is maintained, but abnormal sound is generated due to abrasion of components

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidnoise and abnormal sound

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The driving mechanism operates periodically rather than continuously. The control unit activates the driving mechanism only at predetermined time intervals to move the irradiation spot to different positions on the fluorescent body, then keeps it stationary during non-operational periods. This periodic operation maintains light emission efficiency while significantly extending the service life of the driving mechanism and reducing noise.

Inventive Principle:

Principle #19Periodic action

3Reliability

If the irradiation spot remains fixed on the fluorescent body, then the driving mechanism service life is extended, but temperature increase reduces light emission efficiency

Engineering Contradiction:

Improveservice life of driving mechanismVSAvoidlight emission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The driving mechanism operates periodically rather than continuously. The control unit activates the driving mechanism only at predetermined time intervals to move the irradiation spot to different positions on the fluorescent body, then keeps it stationary during non-operational periods. This periodic operation maintains light emission efficiency while significantly extending the service life of the driving mechanism and reducing noise.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The useful action of light generation continues without interruption. By periodically moving the irradiation spot to different positions on the fluorescent body, the system ensures continuous light emission while preventing localized overheating that would occur with a fixed irradiation spot, thus maintaining both efficiency and component longevity.

Inventive Principle:

Principle #20Continuity of useful 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

This approach significantly prolongs the service life of the illumination optical system and reduces noise by operating the driving mechanism only when necessary, ensuring efficient light generation and reduced wear on components.

Implementation Method 1

a fluorescent body that generates fluorescent light by irradiation with the excitation light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS9140969B2Illumination optical system and projector using the same

Publication Date: 2015.09.22 SHARP KK

AI summary

An illumination optical system includes: a light source that generates excitation light; a fluorescent body that generates fluorescent light by irradiation with the excitation light and that is disposed in a region wider than the irradiation spot of the excitation light; a plate in which the fluorescent body is disposed; and a driving mechanism that moves the plate so that the irradiation spot of the excitation light can intermittently move over the fluorescent body.