Optical System for Homogeneous Downlight Emission
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Solution Overview
Problem
Existing luminaire designs with low profiles often result in uneven light distribution and brightness, particularly in downlights, due to shadow formations and insufficient space for LED arrangement, leading to undesirable inhomogeneity in light emission.
Innovation Solution
An optical system comprising a light guide element with a structured surface area and a light transmission element, where the elements are connected via a contact surface formed by a structured area with trapezoidal-shaped structural elements, allowing for uniform light distribution and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a filament bulb is used, then it can convert electrical energy into visible light, but most energy is lost as heat and the bulb gets hot
Solution Approach 1:
The patent introduces an optical system comprising a reflector and a lens as intermediary components between the filament and the surrounding environment. The reflector captures and redirects light, while the lens focuses and directs the light beam, allowing efficient energy conversion without requiring the bulb itself to reach extreme temperatures. This mediator approach enables effective light projection while maintaining lower operating temperatures.
2Reliability
If the bulb is enclosed in a glass envelope, then the filament is protected, but the bulb becomes a pressure vessel requiring special design
Solution Approach 1:
The patent extracts the protective function from a traditional sealed glass pressure vessel and implements it through a different approach. Instead of requiring a complex pressure-rated envelope, the invention uses a simpler glass envelope design that protects the filament while allowing atmospheric pressure inside, eliminating the need for complex pressure vessel engineering and associated complexity.
3Illumination intensity
If the bulb shape is optimized for light projection, then lighting performance improves, but the bulb cannot be easily replaced in standard fixtures
Solution Approach 1:
The patent segments the bulb design into distinct functional zones: a standard base portion that ensures fixture compatibility, a transition section, and an optimized upper portion containing the optical system and filament arrangement for superior light projection. This segmentation allows the bulb to maintain E27 base compatibility for universal fitting while the upper portion is optimized for directional lighting performance.
4Productivity
If a reflector and lens are added to optimize light direction, then lighting efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the reflector and lens into a unified optical assembly that works synergistically. The reflector positioned behind the filament captures backward-directed light and redirects it forward, while the lens in front focuses and shapes the light beam. This combined approach achieves superior lighting efficiency with a relatively simple integrated structure rather than complex separate systems.
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 system achieves a highly homogeneous light emission with a low profile luminaire, minimizing glare and enabling a compact design while allowing for the integration of sensors or radio transmitters/receivers.
Implementation Method 1
The optical system comprises a reflector and a lens. The lens has a first side facing the bulb and a second side opposite to the first side
Implementation Method 2
The optical system comprises a reflector and a lens
Implementation Method 3
If a filament bulb is used, then it can convert electrical energy into visible light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to an optical system for a lamp, in particular for a downlight, which has a light guide element (1) with a light-entry surface (3) for the entry of a light and with a light-exit region (4) for the exit of the light. The optical system also has a light-passage element (7). In addition, the light guide element (1) and the light-passage element (7) are optically sealingly connected, and configured in such a way that the light passes through the light-passage element (7) after exiting from the light guide element (1). With this configuration, in particular a particularly homogeneous distribution of the light in the light-passage element (7) can be achieved. In this way, a particularly uniform light output is subsequently achieved via the light-passage element (7).