Fluorescent Substrate Motion for Projection Lamp Lifetime
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Solution Overview
Problem
The existing projection type image display apparatuses face challenges in improving the lifetime of fluorescent materials without increasing the size of the apparatus, as the excitatory light is often focused on a single spot, leading to inefficient usage and degradation of the fluorescent material.
Innovation Solution
A system comprising a cluster of excitatory light sources, a substrate with fluorescent material, first and second light intensity detectors, and a control device that moves the substrate based on measured light intensities to distribute the irradiation evenly, preventing excessive focus on a single spot and extending the fluorescent material's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the excitatory light is focused on a single spot of the fluorescent material, then the brightness of the projection is improved, but the lifetime of the fluorescent material deteriorates due to continuous irradiation on one spot
Solution Approach 1:
The patent applies the dynamics principle by making the substrate movable instead of stationary. The substrate is moved in the optical axis direction to change the irradiation position of the excitatory light on the fluorescent material. This dynamic adjustment allows the system to maintain high brightness by concentrating light on specific areas while extending fluorescent material lifetime by periodically changing the irradiation position, preventing continuous degradation of a single spot.
2Duration of action of stationary object
If the excitatory light is irradiated on a position far from the center of the rotation to increase the actual area of irradiation, then the lifetime of the fluorescent material is improved, but the size of the disc substrate and apparatus becomes larger
Solution Approach 1:
The patent applies the dimensionality change principle by transitioning from a two-dimensional rotational approach to a one-dimensional linear movement approach. Instead of rotating the substrate to change irradiation positions (which would require a large disc), the substrate is moved linearly in the optical axis direction. This vertical movement enables the same irradiation area distribution effect without requiring a large horizontal disc substrate, thus extending fluorescent material lifetime while keeping the apparatus compact.
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 solution effectively increases the lifetime of the fluorescent material by distributing the irradiation area, reducing degradation, and maintaining the apparatus's size, thereby enhancing the overall brightness and longevity of the projection type image display.
Implementation Method 1
a substrate on which a fluorescent material to emit fluorescent light by irradiation of the excitatory light is arranged
Data Source
AI summary
A projection type image display apparatus using a light source where excitatory light makes fluorescent material to emit fluorescent light is provided with improved lifetime of a fluorescent material light source without increasing in the apparatus size, The apparatus comprises an excitatory light source cluster, a substrate on which fluorescent material is arranged, light intensity detectors measuring the intensities of the excitatory light and the fluorescent light, a control device which judges based on the measured values of the light intensity detectors whether or not to move the substrate, and a motion device which moves the substrate. The control device may issue an instruction to move the substrate when the ratio of the decrease in the fluorescent light intensity to that in the excitatory light intensity exceeds a prescribed value. Also, the substrate may be moved in a direction perpendicular to the direction of the excitatory light optical axis.