Light Source Device Illuminance Uniformity Control
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Solution Overview
Problem
Existing light source devices with multiple emitters experience illuminance unevenness when the illuminance is reduced below a predetermined level, due to the positions and angles of the selected light sources.
Innovation Solution
A light source device comprising a first and second light source section with light emitters that emit light at specific angles relative to a central axis, and circuitry to individually control the light emitters to reduce illuminance below a predetermined level, thereby minimizing illuminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the number of light sources is reduced to extend lifespan and reduce power consumption, then energy efficiency is improved, but illuminance unevenness occurs
Solution Approach 1:
The patent applies local quality by differentiating the angular characteristics of light emitters. The first light emitter emits light at a positive angle relative to the central axis, while the second light emitter emits light at a negative angle. This localized angular differentiation compensates for the reduced number of active light sources, maintaining uniform illuminance distribution across the light-transmissive member even when fewer sources are operational.
2Duration of action of stationary object
If the number of light sources is reduced to extend lifespan and reduce power consumption, then energy efficiency is improved, but illuminance unevenness occurs
Solution Approach 1:
The patent applies local quality by differentiating the angular characteristics of light emitters. The first light emitter emits light at a positive angle relative to the central axis, while the second light emitter emits light at a negative angle. This localized angular differentiation compensates for the reduced number of active light sources, maintaining uniform illuminance distribution across the light-transmissive member even when fewer sources are operational.
Solution Approach 2:
The patent implements periodic action by alternating between different light emitter configurations. The control unit switches between first and second light emitter sections, or between different light emitters within each section, in a periodic manner. This periodic switching ensures that illuminance uniformity is maintained across different operational states, allowing the system to extend lifespan by reducing the number of simultaneously active light sources while preserving uniform illuminance distribution.
3Manufacturing precision
If light emitters are positioned at specific angles to reduce illuminance unevenness, then illuminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light emitter system into distinct first and second light emitter sections, each with specific angular characteristics. The first light emitter section emits light at positive angles while the second emits at negative angles relative to the central axis. This segmentation allows the control unit to independently manage each section, simplifying the control logic required to achieve uniform illuminance distribution even when fewer light sources are active.
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 reduces illuminance unevenness when the light source device emits light at lower intensities, while also extending the lifespan of the light emitters and reducing power consumption.
Implementation Method 1
a light-transmissive member having a central axis to transmit the first light and the second light therethrough to emit the first light and the second light from the light-transmissive member
Data Source
AI summary
A light source device includes a first light source section including one or more first light emitters to emit first light; a second light source section including one or more second light emitters to emit second light; a light-transmissive member having a central axis to transmit the first light and the second light; and circuitry to individually drive the one or more first light emitters and the one or more second light emitters to reduce illuminance of light emitted from the light-transmissive member to below a predetermined illuminance level. The first light source section emits the first light that enters the light-transmissive member at a positive angle relative to the central axis in a view in a direction orthogonal to the central axis, and the second light source section emits the second light that enters the light-transmissive member at a negative angle relative to the central axis in the view.