Light Pen:
An Input device that utilizes a light-sensitive detector to select objects on a display screen. First light pen was invented in 1952 was part of a project at MIT has been the use of the stylus are common at the beginning of 1980. And was used for the purposes of written communication in a company Fairlight CMI and BBC, and was working with the types of computers Thomson MO5. But it requires the arm to lift long-abundance, which was causing stress for those who use it. Which led to not use it again in 1984 in the offices of book markers in order to speed data recording. And after the stylus has been created depends on the phosphorous emission from the screen.. Developed by companies, and you even arrived to the current format. A light pen is similar to a mouse (as show in given figure), except that with a light pen you can move the pointer and select objects on the display screen by directly pointer to the object with the pen.
An Input device that utilizes a light-sensitive detector to select objects on a display screen. First light pen was invented in 1952 was part of a project at MIT has been the use of the stylus are common at the beginning of 1980. And was used for the purposes of written communication in a company Fairlight CMI and BBC, and was working with the types of computers Thomson MO5. But it requires the arm to lift long-abundance, which was causing stress for those who use it. Which led to not use it again in 1984 in the offices of book markers in order to speed data recording. And after the stylus has been created depends on the phosphorous emission from the screen.. Developed by companies, and you even arrived to the current format. A light pen is similar to a mouse (as show in given figure), except that with a light pen you can move the pointer and select objects on the display screen by directly pointer to the object with the pen.
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| Fig. Light Pen |
Optical Scanner:
These devices are used for automatic data collection. The devices of this category completely eliminate manual input of data. For example, the bar-code reader is actually just a special type of image scanner. An image scanner translates printed images into an electronic format that can be stored in a computer's memory, and with the right kind of software, one can alter a stored image. Another example of scanner images of a typed or printed page into text that can be edited on the computer.
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| Fig. Scanner |
