In computing, astylus (orstylus pen) is a smallpen-shaped instrument whose tip position on acomputer monitor can be detected. It is used to draw, or make selections by tapping. While devices withtouchscreens such aslaptops,smartphones,game consoles,[1] andgraphics tablets[2] can usually be operated with a fingertip, a stylus can provide more accurate and controllable input.[3]
The earliest computer-related usage for a stylus was in 1643 withPascal's calculator.[4] The device had rotary dials that rotated in accordance with the selected numbers; with gears, drums, and clever engineering, it was capable of addition, subtraction, multiplication and division (using 9's constant). A stylus was used to turn the dials.
Later devices of this type include theArithmometer, in the 1860s; and theAddiator, in 1920.[5] The Addiator was a pocket mechanical adding machine that used a stylus to move tiny rigid slices of sheet-metal that were enclosed in a case. On the side of a slice of metal there were numbers that became visible to display the result. It was capable of addition, subtraction, multiplication and division. In 1967 there was a HEXADAT model,[6] which allowed 4-function math to be applied to hexadecimal numbers for use in programming. The first use of a stylus in an electronic computing device was theStylator, demonstrated by Tom Dimond in 1957.[7][8]
Capacitive (also called passive) styluses emulate a finger by using a tip made of rubber orconductive foam; or metal such as copper. They do not need to be powered and can be used on anymulti-touch surface that a finger can be used, typicallycapacitive screens that are common insmart phones andtablet computers. Stylus tips made of rubber or foam are often large, making it rather difficult to get precise notes or drawings.
Capacitive styluses work by distorting the screen’s electrostatic field.[9] Screens that receive input from a capacitive stylus (as well as human fingers) can't register pressure applied by the pen; tilting of the pen; and can't distinguish between a capacitive stylus, your finger, or a resting palm as input - it will register all of these touches as marks on the screen.
Capacitive styluses are made of a conductive material (typically as a metal rod or barrel) to transmit electrical charge between the hand and a rubber[10] or metal tip such as copper. Being free of any digital components, capacitive styluses can be cost effective to manufacture.DIY capacitive styluses can also be made with materials found at home.[11]
Capacitive screens are very widely used onsmart phones andmulti-touch surfaces, where simultaneous use of several fingers is detected.[12] Capacitive styluses tend to work on anymulti-touch surface that accepts input from a finger.
Active (also calleddigital[2]) styluses include digital components or circuitry inside the pen that communicates with a digitizer on the touch device. This communication allows for advanced features such as pressure sensitivity, tilt, programmable buttons, palm detection, eraser tips, memorizing settings, and writing data transmission. In order for an active stylus to function, its digital component protocol must match the digitizer technology it is interacting with. Active styluses are powered by a removable or chargeable battery, or operate passively by inductance.
Active styluses use different protocols by different manufacturers in order to communicate with the digitizer of agraphic tablet ormulti-touch device. The digital protocol of the pen must match the device digitizer, otherwise input from the pen will not register on the device.
A resistive stylus works by applying pressure to the screen, causing two layers (a conductive and a resistive layer) to make contact. This registers as a touch input.[citation needed]
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