How Does a Stylus Mouse Work?
A stylus mouse, generally used with a graphics tablet or digitizing tablet, is a pen-shaped input device that functions like a mouse. It allows the user to draw and write more naturally than a conventional mouse. It may also provide ergonomic benefits to people with hand and wrist injuries. Stylus mice may offer multiple levels of pressure sensitivity or only one. They work through several different mechanisms.
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Passive
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Most tablets on the market use passive technology. This type of tablet includes a set of vertical and horizontal wires built into the device. They generate an electromagnetic signal that the stylus receives. Then, the stylus generates a return signal the wires read to determine where the stylus tip is located. The stylus also contains electronics that read pressure levels and transmit this information back to the tablet. This type of tablet uses relatively little power and requires no battery in the stylus itself. It can also read the stylus location even when it doesn't touch the tablet surface.
Active
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Active tablets include powered electronics in both the tablet surface and the stylus, and require a small battery to power each unit. These tablets have a bulkier stylus that can be more difficult to use. However, they also produce less jitter. Since the stylus and the tablet surface are both self-powered, this kind of tablet doesn't have to switch between receiving and transmitting information, creating a continuous signal.
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Optical
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This relatively uncommon type of stylus mouse contains a tiny digital camera. Often used with actual ink and paper, it records the lines as they're drawn and matches them up with its previous information to create a digital record. These styluses may require special paper with gridded dots on it to work properly, and are used to transfer drawings to computers, cell phones and other digital devices.
Acoustic
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Acoustic tablets use sound to transmit information from the stylus to the tablet. Primarily found in early digitizing tablets, this technology requires a pair of small microphones close to the writing surface. The stylus itself contains a sound generator. Modern acoustic tablets can be used to “draw” in three dimensions.
Capacitive
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Capacitive tablets work with touch screens and high-end design programs. This technology is often found in multi-touch tablets, which require more complex signaling than conventional stylus mice. Capacitive styluses allow tablet computer users to take notes, draw and alter photos at higher speeds than those possible using touchscreen keyboards or finger gestures.
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References
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