LED Lighting Fixture Reflecting Member for Filament Light Distribution
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Solution Overview
Problem
Conventional LED bulbs with curved conical reflecting surfaces struggle to replicate the light distribution characteristics of coiled filament bulbs, leading to inconsistent luminance and shadow formation due to support constraints within lighting fixtures.
Innovation Solution
An illuminating device with a reflecting member featuring a concave first reflecting surface, a convex second reflecting surface, and an inverted conical third reflecting surface, configured to converge and diffuse light rays, forming pseud point light sources that mimic the light distribution of a conventional bulb filament, thereby achieving similar light distribution characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED elements are disposed on a support member in a scattered manner to form a bulb-type lamp, then the device can be constructed with LED technology, but the optical system with a single focal point cannot accurately control the light distribution of light emitted from LED elements
Solution Approach 1:
The invention divides the support member into multiple focal points, with each LED element assigned to a specific focal point. This segmentation allows each LED element to be independently controlled by its own focal point, enabling accurate light distribution control for each element rather than treating all LEDs as a single group.
Solution Approach 2:
The invention applies different optical properties to different regions of the support member by providing multiple focal points at different locations. Each focal point is optimized for its specific LED element, creating local optical quality that matches the requirements of each light source position.
2Illumination intensity
If a curved conical reflecting surface is used to form a pseud light source, then light can be reflected radially sideward and obliquely rearward, but the light distribution characteristics and luminance distribution differ from those of a coiled filament with constant diameter
Solution Approach 1:
Instead of using a single curved conical reflecting surface that creates non-uniform light distribution, the invention inverts the approach by using multiple flat reflecting surfaces arranged to create uniform light distribution characteristics that match coiled filament bulbs.
Solution Approach 2:
The invention segments the reflecting surface into multiple flat reflecting surfaces, each positioned and angled to direct light from specific LED elements. This segmentation allows precise control over light distribution to achieve uniformity similar to coiled filament bulbs.
3Volume of moving object
If the space within the lighting fixture is limited, then the fixture size is compact, but support structures must be arranged in the vicinity of the reflecting member which results in formation of shadow by the support
Solution Approach 1:
The invention extracts the support function from separate support structures and integrates it into the optical system itself by using the support member as the focal point structure. This eliminates the need for separate support structures that would cast shadows.
Solution Approach 2:
The invention merges the support function with the optical focusing function by making the support member itself the focal point structure. This combination eliminates the need for separate support structures that would interfere with light distribution and create shadows.
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 device emits light with consistent distribution characteristics comparable to coiled filament bulbs, allowing for seamless replacement of traditional bulbs and efficient heat dissipation, ensuring reliable and uniform lighting.
Implementation Method 1
a first focal point F1 disposed at or near the light emitting element 3 and a second focal point F2 disposed on an optical axis Z of the light emitting element 3 and between the first focal point F1 and the reflecting member 20, light rays L2 emitted from the light emitting element 3 can be reflected by the first reflecting surface 23 to be converged to the second focal point F2 and then be diffused to travel rearward
Implementation Method 2
a second reflecting surface 22 having a substantially conical face shape with an apex at an intersection between the optical axis Z and the reflecting member 20 and a conical side wall with an increased diameter as the conical side wall extends toward the light emitting element 3, light rays L1 emitted from the light emitting element 3 can be reflected by the second reflecting surface 22 to form a pseud point light source 7
Implementation Method 3
a third reflecting surface 24 having a substantially inverted conical face shape inclined with respect to the illumination direction of the light emitting element 3 and linearly away from the optical axis Z, light rays L3 emitted from the light emitting element 3 can be reflected by the third reflecting surface 24 to travel forward at wide angles
Data Source
AI summary
An illuminating device includes an LED element, and a reflecting surface arranged in front of the LED. The reflecting surface includes a second reflecting surface formed in a substantially conical face shape with an apex at an intersection between an optical axis of the LED and the mirror reflecting surface and a conical side wall bulged inward, and a first reflecting surface formed as a concave reflecting surface recessed forward and having a first focal point disposed at or near the light emitting element and a second focal point disposed on the optical axis between the first focal point and the intersection. A housing including a plurality of reflective surfaces might also be included, with the illumination device positioned within.