Handwriting drawing input device is an input device for computers. The most common one is a handwriting instrument (also called a handwriting tablet), which functions similarly to a keyboard or mouse. Of course, it is basically limited to inputting text or drawing, and also has some mouse functions.

Chinese name

Handwriting device

Category

Handwriting drawing input device

Also known as

Handwriting tablet

Field

Electronic products

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Introduction

Handwriting usually uses a special pen, or a finger in a specific area Write text inside. The handwriting instrument records the trajectory of the pen or finger through various methods, and then recognizes it as text. It is very useful for people who don't like to use the keyboard or are not used to using the Chinese input method, because it does not require learning the input method. Handwriting instruments can also be used for precise drawing, such as circuit design, CAD design, graphic design, free drawing, text and data input, etc.

Some handwriting instruments are integrated on the keyboard, and some are used alone. , handwriting instruments used alone generally use USB port or serial port. There are many types of handwriting devices at present, some have both handwriting input Chinese character and cursor positioning functions, and some are dedicated to precise positioning of the screen cursor to complete various drawing functions. When purchasing, you must first clarify the purpose for which you are buying the handwriting instrument. In addition, the price of handwriting instruments also varies greatly, ranging from more than a hundred yuan to several thousand yuan; you can choose accordingly according to your needs and financial situation.

Category

Resistance pressure type

Resistance type handwriting instrument is composed of a layer of deformable resistance film and a layer of fixed resistance film, with air in the middle Isolated. Its working principle is: when a pen or finger touches the tablet, the upper resistor is deformed under pressure and contacts the lower resistor, and the lower resistor film can sense the position of the pen or finger. Advantages: simple principle, uncomplicated process, lower cost, and cheaper price. Disadvantages: (1) Since the position is determined through the deformation of the sensing material, the sensing material is prone to fatigue and has a short service life. (2) The feel is not very sensitive. If the pressure is not enough during use, there will be no response. If the pressure is too high, the sensor board will be easily damaged.

Electromagnetic pressure-sensitive type

Electromagnetic handwriting instrument is to sense the pen tip with coil by forming an electromagnetic field within a certain spatial range after the wiring circuit under the handwriting instrument is energized. location for work. This technology is currently widely used, mainly due to its good performance. Users can write smoothly with it, it feels good in the hand and is useful for drawing. The electromagnetic induction board also has disadvantages: (1) It has high voltage requirements. If the voltage used does not meet the requirements, the work will be unstable or cannot be used. (2) It has poor anti-electromagnetic interference and is prone to interference with other electromagnetic equipment. (3) The stylus tip is a movable part and has a short service life (generally about one year). (4) You must use a stylus to work, and cannot operate directly with your fingers.

Capacitive touch type

The working principle of the capacitive handwriting instrument is to sense the position of the finger through the capacitance of the human body. That is, when the user's finger touches the touch panel, A capacitance is created right on the surface of the board. There is a sensing matrix attached to the surface of the touch panel. This sensing matrix, together with a special chip, continuously tracks the "trajectory" of the user's finger capacitance. After a series of internal processes, it can Accurately locate the position of the finger (X, Y coordinates), and at the same time measure the change in capacitance value due to the distance (pressure level) between the finger and the plate, determine the Z coordinate, and finally complete the determination of the X, Y, and Z coordinate values. Because the stylus used in capacitive touch panels does not require a power supply, it is particularly suitable for portable products. This kind of touch panel works in Graphic Table Mode, and its X and Y coordinate accuracy can be as high as 40 points per millimeter (ie, 1000 points per inch).