Cylindrical Light Guide Member for Wide Distribution
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Solution Overview
Problem
Existing bulb-type light source apparatuses face limitations in achieving a wide light distribution angle, as they rely on reflection members that do not efficiently expand light distribution beyond the front surface.
Innovation Solution
A bulb-type light source apparatus featuring a cylindrical light guide member with an optical pattern on both inner and outer surfaces, which diffuses and reflects light to achieve a wider distribution angle, and a holding member with a reflection function to enhance light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection member is used to expand light distribution by reflecting light toward the rear side, then light distribution is expanded, but the light extraction efficiency is insufficient and the light distribution angle is limited
Solution Approach 1:
The patent introduces a light guide member as an intermediary component between the light source and the external environment. This light guide member receives light from the light source and guides it through its internal structure to achieve both wide light distribution and efficient light extraction, resolving the contradiction by providing a mediating structure that performs both functions simultaneously
Solution Approach 2:
The patent transitions from traditional two-dimensional light reflection surfaces to a three-dimensional light guide member with specific internal optical patterns. By utilizing the third dimension (depth/thickness of the light guide member) to create complex optical pathways and patterns, the system achieves both wide angular distribution and efficient light extraction that cannot be achieved with simple planar reflectors
2Illumination intensity
If a cylindrical light guide member is used to guide light from the light source, then wide light distribution is achieved, but the structural complexity increases
Solution Approach 1:
The light guide member is segmented into distinct functional zones: a light incident end surface for light input, an outer surface for light output, and an optical pattern portion in between. This segmentation allows each zone to be optimized for its specific function while maintaining overall structural efficiency, reducing complexity through functional decomposition
Solution Approach 2:
The cylindrical light guide member serves multiple functions simultaneously: it acts as a light guide, a structural housing, and an optical element with integrated patterns. By combining these functions into a single component rather than using separate elements, the patent reduces overall device complexity while achieving the desired light distribution uniformity
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 wide light distribution angle and improved light extraction efficiency by guiding and diffusing light from the source through the cylindrical light guide member, resulting in uniform surface luminance and reduced light leakage.
Implementation Method 1
The optical pattern formed on the inner surface may include a function of varying a light reflection angle so that light exits via the outer surface
Implementation Method 2
The optical patterns including a light diffusion function can diffuse light totally reflected inside the light guide member and average surface luminance
Data Source
AI summary
A bulb-type light source apparatus includes a light source and a light guide member. The light source is provided annularly. The light guide member includes an outer surface, a light-incident end surface opposing the light source, and an optical pattern portion configured to emit, from the outer surface, light that enters from the light-incident end surface.