Asymmetric Lighting Device with Stepped Reflector for 3D Displays
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Solution Overview
Problem
Existing lighting devices and three-dimensional image display devices face challenges in achieving a compact design while maintaining effective light distribution and preventing direct light incidence on display members.
Innovation Solution
A compact lighting device is designed with a light source, a lens, and a reflector featuring multiple reflecting regions arranged with steps. This configuration ensures that light is distributed asymmetrically, reducing the reflector's length and preventing direct light incidence on display members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lighting device is used to ensure effective light distribution, then the light distribution is adequate, but the device size becomes large
Solution Approach 1:
The reflector is divided into multiple reflecting regions (first, second, third reflecting regions) with different functions. Each region handles specific light paths: the first reflecting region reflects light in a first direction, the second reflecting region reflects light in a second direction, and the third reflecting region reflects light in a third direction. This segmentation allows compact arrangement while maintaining effective light distribution.
Solution Approach 2:
The lens is designed with asymmetric light distribution characteristics where the light distribution angle from the first part of the lens (positioned further toward the light-emitting side) is less than the light distribution angle from the second part of the lens (positioned further toward the opposite side). This asymmetric design optimizes light control in different directions, enabling compact device configuration while maintaining adequate illumination.
2Volume of moving object
If the reflector length is reduced for compact design, then the device becomes compact, but direct light may incident on the display member
Solution Approach 1:
The reflector is segmented into multiple functional regions that collectively cover all necessary light reflection paths. The first reflecting region handles light at a first angle, the second reflecting region handles light at a second angle, and the third reflecting region handles light at a third angle. This comprehensive segmentation ensures complete light control in a compact configuration, preventing direct light incidence on the display member while maintaining device compactness.
Solution Approach 2:
Each reflecting region is positioned and configured with specific local properties to handle particular light paths. The first reflecting region is positioned to reflect light in a first direction, the second reflecting region is positioned to reflect light in a second direction, and the third reflecting region is positioned to reflect light in a third direction. This localized optimization ensures that each region effectively controls specific light paths, preventing direct light incidence while maintaining compact overall device size.
3Device complexity
If symmetric light distribution is used, then the optical design is simple, but the light distribution pattern is insufficient for compact configuration
Solution Approach 1:
The lens is designed with asymmetric light distribution where the light distribution angle from the first part of the lens (positioned further toward the light-emitting side than the optical axis) is less than the light distribution angle from the second part of the lens (positioned further toward the opposite side than the optical axis). This asymmetric design enables compact device configuration by optimizing light control in different directions, achieving better space utilization while maintaining manageable optical design complexity.
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 enables a more compact lighting device and three-dimensional image display device, with improved light distribution and reduced risk of direct light incidence, resulting in clearer three-dimensional images.
Implementation Method 1
a lens on which light emitted from the light source is incident
Implementation Method 2
a reflector including multiple first reflecting regions, wherein each of the first reflecting regions reflects light emitted from the lens
Data Source
AI summary
A lighting device includes a light source, a lens receiving light from the light source, and a reflector including multiple first reflecting regions, wherein each first reflecting region reflects light from the lens in a first direction crossing an optical axis of light incident on the lens. The first reflecting regions are arranged with steps interposed therebetween so that the regions further toward a light-emitting side of the reflector in the first direction have greater distances from the lens in a second direction in which the optical axis extends. A light distribution angle of light from a first part of the lens further toward the light-emitting side than the optical axis in the first direction is less than a light distribution angle of light from a second part of the lens further toward a side opposite to the light-emitting side than the optical axis in the first direction.