LightTools-based car dashboard light guide button design
LightTools Design Example--Design of Light Guide Button for Car Dashboard
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LightTools comes with a library of enhancement components and a library of light sources. The library of enhancements includes BEM and DBEF from 3M. The library of light sources includes nearly 400 LED sources from 4 LED companies (Agilent, Lumileds, Nichia, Osram). LCDTVs designed with LED lighting are extremely convenient. The traditional light guide plate design is more convenient, it can simulate two-dimensional printing point arrangement, and can also simulate three-dimensional microstructure laying. At present, the microstructured dot includes five shapes: ball, prism, pyramid, cone, cylinder. Greatly improve the efficiency of the designer.
Cybernet China uses LightTools to design the light guide buttons for car dashboards as follows:
Key point: Two small power LEDs are used to achieve uniform illumination of the three letters on the light guide button.
Design steps
LED light source simulation simulation light guide button geometric modeling geometric material properties, optical properties set the light analysis surface, the brightness meter set the ray tracing, the result analysis according to the analysis results modify the button geometry model, repeat the ray tracing process, Until the simulation results reach the system design requirements. (Using LT's optimization module can replace cumbersome model changes and shorten the project development cycle)
For the LED light source simulation, the parameters are briefly explained here. The light source model has detailed parameter settings. The main parameters are introduced below. (Depending on the purpose of the simulation, the required parameters are different.)
Beam (lm) or radiated power (mW)
Spectral characteristic distribution of light intensity distribution
Light source definition based on wavelength range
LightTools can set the light source efficiently and flexibly.
LightTools can propose customized solutions that include surface, volume and surface light sources.
The Ray Data setting in LightTools can be measured using Radiant Imaging.
All light energy can be defined in the light source in terms of the amount of radiation or metering energy.
User-defined Aim fields and Aim cones can lead to optimal performance.
In order to match this efficient function, it is planned to define a continuous spectrum in the light source.
LightTools has more powerful built-in modeling capabilities for geometric modeling of light guide buttons
Fully inheriting the feature tree from SolidWorks through the Solidworks Link module LightTools provides a familiar design environment for engineers who have used Solidworks. Two-way data communication ensures real-time synchronization of features in LightTools and Solidworks.
High-accuracy simulation results comparison
The lower picture is the result of the illumination analysis, and is output corresponding to the illuminance distribution of the light emitted from the position (the light receiving surface) of the text in the button. Corresponding to the rectangular diagram of the above figure, the energy is represented by different colors. From the following illuminance distribution map, we can analyze the simulation results of this system to basically meet the design requirements.
Monte Carlo ray tracing
The LED light source, the button model, and the light-receiving parameters are all set before optical simulation, and the simulation uses Monte Carlo ray tracing.
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