Light guide plate pattern design software

Walls, drapes, artwork, and photographs are a few examples. The guidelines for an accent lighting layout are:. The layout rules are the same on a sloped ceiling as they are on a flat ceiling. This will significantly reduce glare, especially in rooms where the seating faces the slope of the ceiling.

If a layout leaves you with a light directly above a TV, you may be concerned with it causing glare or washing out the picture. The solution is not to eliminate the light, but rather to separate the layout into two control zones.

This will allow you to control one or more of the lights independently from the rest, and give you ultimate flexibility in your design. For example; if you are installing six lights in a room, you may want to separate the lights into two zones with three lights each. You can dim or turn off the row of lights in front of the television, while still having some light over the sofa from the other row of lights.

Recessed Lighting Layout. Ray tracing is used in this Application Brief to illustrate the performance of light guide designs. There are three design issues to be examined when designing a light guide: 1 effective flux coupling to get the light from an LED lamp into the light guide with minimal loss, 2 transmitting the light through the guide to the exit surface, and 3 allowing the light to escape through the exit surface with minimal loss. Flux from an LED lamp must be effectively coupled to the entrance end of a light guide to permit light capture light to enter the light guide with minimal loss before it can be effectively transmitted and utilized.

Flux coupling and capture are usually ineffective when the LED lamp is external to the envelope of the light guide surface to air boundary, and conversely are effective when the lamp is located inside the light guide surface to air boundary.

With the LED lamp external to the light guide, as shown in Figure 5, effective flux coupling and light capture occur only when the LED lamp radiation pattern angle matches the acceptance pattern angle of the light guide. Thus, effective flux coupling may be very difficult to accomplish and most of the flux from the LED lamp may be lost. A lens may be used for flux coupling to focus the flux from an LED lamp onto the entrance end of a light guide, as shown in Figure 6.

The focused flux should just fill the entrance end of the light guide. The cost of the focusing lens must be added to the cost of the light pipe design. The best design for most effective flux coupling is to have the LED lamp located inside the envelope of the light guide surface to air boundary. This concept is illustrated in Figure 7a. In this configuration, the LED lamp is embedded into the light guide and all light rays emanating from the LED lamp are captured by the light guide.

Figure 7a. Figure 7b. In most light guide applications, using epoxy to glue the LED lamp to the light guide to eliminate air gap Fresnel loss is neither practical nor necessary. All of the suggested light guide designs presented in this Application Brief assume there is an air gap between the LED lamp and the light guide.

The exterior surface finishes of a light guide are important to assure proper operation, as shown in Figure 8. The sides parallel to the direction of light travel should be smooth, like a mirror, to affect total internal reflection. They may be painted with a white light reflecting paint to reflect those diagonal rays less than the critical angle that may otherwise escape. The entrance end should be smooth, contoured to match the LED lamp device for effective light. The exit end should be diffused.

A diffused exit end has random critical angles across its surface providing a high probability light rays can escape, and also scatters the light rays producing a wide radiation pattern. Light guides may be made in any desired shape, cylindrical oval , rectangular square , conical. Figure 8. For rectangular and special shapes, the corners should have a radius greater than 0.

The shape of the light guide may gradually change along its length, i. For effective flux coupling and light capture, the light entrance end of a light guide should be smooth and flat or concave contoured to match the light output radiation pattern and package configuration of the mating LED lamp device. For SMT LED lamp devices that have a light emitting area that is a flat surface, the entrance end of the light guide should be a smooth flat surface.

The entrance end of the light guide should be placed over and in close proximity to the light emitting surface of the SMT LED lamp for effective flux coupling and light capture, as illustrated in….

Figure 9. The smooth concave surface enhances flux coupling and light capture by reducing the possibility of a light ray intersecting the light guide at the critical angle and being reflected. Figure The lamp is located in a through hole and surface mounted on the component side of the board. The smooth concave surface entrance end of the light guide captures more of the radiated flux from the. LED lamp than does a flat surface. For best performance, insertion to the base flange on the lamp package is.

The end of the hole should be a smooth spherical dome radius. The hole should be at least 5. Draw to Any Scale You can draw your plan using any scale selected from the standard architectural, civil engineering, mechanical engineering and metric scales.

The drawing area will show rulers and a grid in real world coordinates to help you design. You'll also be able to change the scale of the drawing mid-drawing. You don't have to worry about picking the wrong scale and having to start over. You can even define your own scale if is not among the standard scales offered.

Powerful Architecture Design Tools SmartDraw helps you align and arrange all the elements of your architectural diagram perfectly. Walls connect easily. You can set the size of any shape or line by simply typing its dimensions. Free Support Got a question?