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Laser pointer

Laser pointers are used to emit a laser beam to point out or draw attention to a particular item or thing on a display. Laser pointers are widely used for meetings and presentations. A presenter may use a laser pointer to draw attention to a particular area of the projection screen. In recent years, presentations are often performed while projecting images on a display of a personal computer onto a screen by using a liquid crystal projector. Laser pointer uses a spot light for pointing the referring portion, and has such advantages that it can point out any portion on the screen from a distance, and with easier in handling than a rod-like pointer. Laser pointers are commonly comprised of a cylindrical casing holding a battery set, a control circuit board, a laser module and a lens. The laser module which holds a laser beam is fixedly mounted inside the casing, and controlled to emit a laser beam. A semiconductor laser used in a typical laser pointer is mainly of a red light emitting laser diode, and in many cases, red color light close to infrared is used.

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