A light guide is a transparent optical component that carries light from a source to a chosen location or distributes it along a designed path. It may route light to a small indicator, spread it across a display, or carry it through a flexible fiber. The guide transports or redirects light; it is not necessarily the light source itself.
How does a light guide work?
In many solid light guides, light enters at a suitable angle and reflects repeatedly inside the transparent material. This effect, called total internal reflection, keeps light traveling along the guide rather than escaping through its sides.
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Design features can make light leave the guide where it is needed. Dots, grooves, textures or prisms alter the light’s path, allowing a designer to control where and how it exits. A rod might use microprisms to release light along its length; a plate may use distributed extraction features to spread light across a surface.
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A typical arrangement pairs a guide with an LED, but these are separate components: the LED produces light, while the guide routes or redistributes it.
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What are the main types of light guide?
Light pipes and rods
A light pipe routes light from an emitter to a point such as a control-panel indicator. Rod-shaped guides can also illuminate a line, for example a scanner’s reading area. “Light pipe” is often used for compact light-routing components, and sometimes as another name for a light guide.
Light-guide plates and films
A plate or film distributes light over a wider area. In an edge-lit LCD backlight, light enters at an edge and extraction features help spread it across the display. The required output pattern and the geometry of the display influence the design.
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- Please REMOVE the end protective caps before using the cable.
- IN THE BOX: 6-foot digital optical audio Toslink cable.
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- CONNECTS DEVICES: Quickly connects a sound bar, CD player, Blu-Ray player, game console, or other device to an audio system or TV.
Fiber-optic guides
Fiber-optic guides carry light through flexible fibers. They are useful when the route needs to bend or when light must be carried over a distance, including in applications such as medical imaging.
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Where are light guides used?
Depending on their form and design, light guides are used in LCD backlights, automotive interior and accent lighting, scanners, and control or status indicators. A small indicator light pipe and a display backlight plate are both light guides, but they serve different geometries and output needs.
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How do you choose a light guide?
Start with the required light path and output, then assess the characteristics that matter for that application. Display plates and films, for example, may need to be compared by:
- Light distribution: the spatial pattern and viewing angles the display requires.
- Uniformity: how evenly light should appear across the viewing area.
- Geometry and thickness: the available space and the display’s physical dimensions.
- Optical behavior: transmission and any color effects that could alter the intended output.
- Material stability: how the material behaves under the application’s heat and humidity conditions.
These criteria are not identical for every form. For line illumination, both a molded guide and a fiber-optic guide may be options. Fibers offer flexible routing, while a molded guide can provide more control over light distribution and design flexibility. The appropriate choice depends on the intended geometry and source, so confirm expected performance with the component supplier.
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- Optical digital audio cable: Perfect for equipment with a TOSLINK interface (OPT In / OPT Out or S/PDIF In / S/PDIF Out). TOSLINK connector to TOSLINK connector (F05 connector)
- Versatile: Ideal for transmitting crystal-clear digital audio from your TV, video game console (PS3/PS4/Xbox One), DVD/Blu-ray player, or TV streaming box to a soundbar, amplifier/amp, stereo/Hi-Fi system, D/A converter, and more
- High-End: This metal-free fiber optic audio cable, featuring a fully flexible PVC jacket, is entirely immune to electrical interference. Each cable undergoes multi-stage testing during manufacturing to ensure maximum product quality and durability
- 24K gold-plated connectors: Corrosion resistant gold plating keeps connectors clean. And because these cables are fiber optic, they provide 100 % signal transmission with 0 % loss
- No risk: 36 months manufacturer warranty
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