ABSTRACT
Copiers and printers utilize a varying number of interruptive or reflective optical sensors. Keyboards and optical mice can be interfaced to a computer by using a near-infrared light source. The touch screen may use discrete-lensed Infrared Light Emitting Diodes (IRLEDs) and photosensors with convex magnifying lenses in front of the devices to focus the light beams. The sequencing of the IRLEDs and photosensors allows the signals to more accurately identify with ambient light present, allowing the object breaking the light beam to be easily recognized in a variety of light environments. Data may be communicated between computers using several methods. The use of routers and hubs connected through fiber-optic cables is a standard secure configuration in many IT systems. Optical couplers are used to isolate one power system from another while transferring digital or analog information between them and to prevent ground loops. Isolation of current spikes or shorts can easily be accomplished by using optical couplers/isolators.
