A two-step design method for high compact rotationally symmetric optical system for LED surface light source.

Area of Science:

• Optical Engineering
• Illumination Systems Design

Background:

• Designing compact far-field illumination systems requires balancing illuminance uniformity and light control efficiency.
• Existing methods often struggle with accuracy, especially for non-rotationally symmetric light sources or complex distributions.

Purpose of the Study:

• To propose a novel two-step optimization method for designing compact single-surface far-field illumination systems.
• To achieve high illuminance uniformity and light control efficiency simultaneously, particularly for systems with a small height-to-diameter ratio (h/D < 3:1).

Main Methods:

• The first step employs an improved tailored edge-ray design (TED) method to generate an initial optical system, balancing uniformity and efficiency.
• The second step uses an iterative feedback modification process to refine the initial design, mitigating performance degradation from skew rays.

Main Results:

• A free-form rotationally symmetric lens was designed for a discoidal LED source (h/D = 2.5:1), achieving illuminance uniformity of 0.75 and light control efficiency of 0.86.
• The two-step method demonstrated accurate initial system construction and rapid convergence within several iterations.
• The method successfully designed a system for circular linear illumination distribution.

Conclusions:

• The proposed two-step optimization method effectively designs compact, high-performance far-field illumination systems.
• The method offers an accurate and efficient approach for achieving both high illuminance uniformity and light control efficiency.
• This technique is adaptable for designing systems with complex, non-uniform illumination distributions.