Wacom LCD Signature Tablets
Wacom signature tablets arrived on the market in 2007. Today hundreds of thousands of these devices are in use around the world. The initial spark for the development of this highly successful device category was based on a wish list from many customers in the financial industry. Excellent capturing quality and robustness ranks high on their list. Signature pads fulfill these requirements perfectly. They are built by the world market leader for pen tablets: Wacom. Today signature tablets are being used not only in financial institutions across many countries but also in retail, insurance, telecommunication, furniture stores, government agencies (citizen service bureaus and car registration offices) and at many other workplaces. The advantages of Wacom signature pads are evident wherever signing documents are part of company procedure. This information sheet explains why you can rely on these types of signature pads in particular.
Numerous Wacom signature tablets have been in use since 2007. They still look almost like new although a hundred signatures or more per day are captured on these devices, some customers may sign with a ballpoint pen by mistake or even place sharp-edged rings on the surface. Signature tablets forgive even a fall to the ground because they have a protected and robust design. The outstanding practicality of the pads results from the use of electromagnetic resonance (EMR) technology. Wacom holds numerous patents for this technology.
How signature tablets work. Beneath the surface of the pad there are horizontally and vertically oriented antennas, changing within microseconds between transmission and reception mode. Electromagnetic waves enable the pad to determine the position of the pen using triangulation. An electromagnetic signal stimulates a resonant circuit comprising a coil and capacitor in the pen to oscillate.
The resonant circuit behind the pen tip is driven by electric power from the tablet and serves as a transmitter. The received signal then passes through the modulator to the chip. The information from the pressure sensor (capacity) goes to the chip and from there they enter the modulator. This returns a signal to the resonant circuit in the tip which sends it back to the tablet.
Comparison with alternative technologies Alternative methods to electromagnetic resonance are based on touch response. With this technology, the sensor consists of a sandwich of two conductive coated plastic films. This sandwich makes up the top layer on the signature pad. The action of pressure changes the electrical resistance of the sandwich. The variation in distance between the two plastic layers allows for the detection of the pen location and pressure intensity. In comparison, signature tablets from Wacom offer significant advantages:
• More robust: signature tablets have a glass surface that is indestructible in proper usage scenarios.
• More ergonomic: The rest of the palm or fingers on the display of signature tablets does not generate any interference.
• More reliable: Linear and significantly more accurate capturing of bio-metric data of the signature.
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