Ceiling Lamp Collimator Optics for Downlight Distribution
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Solution Overview
Problem
Existing ceiling-mounted lamps struggle to achieve optimized light distribution for downlight applications without complex structures or reflectors, and existing collimator optics are limited in their ability to provide a wide radiation angle while minimizing light losses.
Innovation Solution
The use of collimator optics with a large diameter and strategically designed light entry and exit surfaces to reduce the opening angle of LED light emission, combined with a reflector that can be opaque or darklight, allows for a radiation angle between 40° and 120°, enabling efficient downlight distribution without the need for additional reflectors and minimizing stray light losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If collimator optics with large diameter are used to achieve narrow light distribution, then beam angle is reduced, but radiation angle becomes too small for downlight applications
Solution Approach 1:
The luminaire is divided into multiple independent light sources (LEDs arranged in a matrix), where each LED is coupled with its own collimator optics. This segmentation allows the system to achieve both narrow beam angles from individual collimators and wide radiation angles through the combined effect of multiple sources distributed across the ceiling surface.
Solution Approach 2:
The invention transitions from a single-point light source to a two-dimensional matrix arrangement of multiple LEDs. By distributing light sources across the ceiling plane rather than concentrating them at one location, the system achieves wide effective radiation angle while maintaining the narrow beam angle capability of individual collimator optics.
2Illumination intensity
If conventional light sources are used, then light distribution is achieved, but LED light emission over large solid angle requires complex collimator optics
Solution Approach 1:
Instead of using complex collimator optics for a single LED to achieve wide light distribution, the invention segments the light source into multiple LEDs arranged in a matrix. Each LED uses simple collimator optics, and the collective arrangement provides the desired wide illumination pattern without requiring complex individual optical components.
3Loss of energy
If collimator optics are positioned close to LED to overlap light entry surface with emission surface, then light losses are reduced, but precise positioning is required
Solution Approach 1:
The use of multiple segmented LED-collimator units in a matrix arrangement provides tolerance to positioning errors. While each individual unit benefits from precise positioning to minimize light losses, the distributed nature of the matrix means that minor misalignments in individual units do not catastrophically affect overall system performance, unlike a single critical light path.
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 solution achieves optimized light distribution for downlight applications with a simple structure, reducing light losses and allowing for precise control of the light beam, making the lamp suitable for illuminating specific areas while minimizing visibility of the light source.
Implementation Method 1
collimator optics which ensure that the light is focused. In this way, in particular, spot light distributions of the luminaire can be generated.
Implementation Method 2
a collimator lens as secondary optics in the light path behind the LED (so-called primary optics), which bundles the light, e.g. B. to achieve parallel light beams
Data Source
AI summary
The invention relates, among other things, to a luminaire (10) for mounting on a ceiling (25) of a building room and for illuminating a floor area (31) or a part of a building, comprising at least one LED (11) having a light emission surface (42), a collimator optic (12) provided by a separate component, with a light entry surface (20) extending over the light emission surface, and with a light exit surface (23), wherein the collimator optic has a beam angle (α) between 75° and 120°.