Ring Illumination Device Using Cylindrical Light Propagation
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Solution Overview
Problem
Existing illumination devices using laser diodes have limitations in achieving a small size, simple structure, and uniform ring-shaped illumination with sufficient wavelength conversion.
Innovation Solution
The proposed illumination device incorporates a laser light source, a cylindrical body, a reflector, and a ring assembly with a fluorescent surface, where the laser light is reflected and propagated along the inner circumferential surface of the ring assembly, allowing for efficient wavelength conversion and uniform ring-shaped illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a laser diode is used as a light source with a mirror for reflection, then the device structure is simplified, but the region for wavelength conversion is too small to achieve sufficient illumination uniformity
Solution Approach 1:
The invention transitions from a planar reflection geometry to a three-dimensional ring-shaped reflection path. The light beam travels along the circumferential direction of the ring assembly, increasing the wavelength conversion region from a small area to an extended circular path, thereby achieving both structural simplicity and illumination uniformity.
Solution Approach 2:
The reflector is divided into multiple reflecting surfaces (first and second reflecting surfaces) that segment the light beam into different propagation paths. This segmentation allows the light to traverse different segments of the ring assembly's inner circumferential surface, ensuring uniform illumination distribution around the ring while maintaining a compact structure.
2Illumination intensity
If a circular ring reflector is used to diffuse light, then illumination is achieved, but the device lacks practicality for specific applications requiring compact size and simple structure
Solution Approach 1:
The invention merges the reflector and the light propagation path into an integrated ring assembly structure. The ring-shaped inner circumferential surface serves both as the reflection surface and the light guide, eliminating the need for separate components and achieving a compact, practical device with good illumination capability.
3Shape
If light is reflected at the inner circumferential surface of a ring assembly, then ring-shaped illumination is achieved, but the wavelength conversion region must be sufficiently large for uniform luminous intensity
Solution Approach 1:
The invention extends the wavelength conversion region by utilizing the circumferential dimension of the ring assembly. Instead of relying on a small planar area, the light beam travels along the circular path of the ring, converting wavelength over an extended three-dimensional region that maintains compact overall device size while ensuring uniform luminous intensity distribution.
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 enables the production of ring-shaped illumination with uniform luminous intensity, achieving a compact and practical illumination device with improved practicality and efficiency.
Implementation Method 1
a first reflecting surface that reflects a first portion of light emitted from the laser light source so that the portion of light is propagated from a first side of the inner circumferential surface in the circumferential direction to a second side of the inner circumferential surface in the circumferential direction, and a second reflecting surface that reflects a second portion of light emitted from the laser light source so that the second portion of light is propagated from the second side of the inner circumferential surface in the circumferential direction to the first side of the inner circumferential surface in the circumferential direction
Implementation Method 2
a fluorescent surface adapted to emit fluorescence by light reflected and propagated at the inner circumferential surface
Data Source
AI summary
An illumination device includes: a laser light source; a cylindrical body disposed such that light emitted from the laser light source enters the cylindrical body at a first end portion side of the cylindrical body and passes through the cylindrical body; a reflector disposed so as to reflect light passing through the cylindrical body; and a ring assembly comprising a ring-shaped inner circumferential surface configured to reflect and propagate light from the reflector. The reflector includes: a first reflecting surface configured to reflect a first portion of light emitted from the laser light source, and a second reflecting surface configured to reflect a second portion of light emitted from the laser light source. The ring assembly further includes a fluorescent surface adapted to emit fluorescence by light reflected and propagated at the inner circumferential surface.