1. Optical
The principle of the optical
Panel Rapair Membrane Switch is based on the principle of receiving and blocking the light source. The range of the panel is filled with the light source and the receiver to form a matrix. When the light is blocked, the position of the receiver that cannot receive the signal can be known, and then it can be determined. Precise location. The components of an optical
Touch Panel include a glass substrate, an infrared emitting source, and an infrared receiver. The method of installation is to place the infrared transmitter on the left and lower sides of the
Glass Panel, and install infrared receivers on the right and upper sides. When the infrared rays are blocked by a finger or contact, the information received by the receiver can be measured. The matrix position of the contact point. The advantage is that the surface is pure glass, which does not affect the light transmittance, has high reliability, scratch resistance, and good fire resistance, but the disadvantage is that it has poor waterproof and stain resistance. Generally used in the use of ATM, OA business machines, and medical equipment.
2. Sonic
The sonic touch panel is composed of a transmitting transducer, a receiving transducer, a reflector and a controller. The composition and sensing principle of the sonic touch panel is to install a transmitting transducer, a reflecting plate, and a receiving transducer on the X and Y axes of the glass and on the opposite sides, plus a controller to form a sonic touch panel . The sensing action method first sends a 5MHz electronic signal from the controller to the transmission transducer, which is converted into ultrasonic waves by the transmission transducer, and is directly transmitted through the surface of the touch panel to the reflector array, which is on the opposite corner of the reflector. After receiving the ultrasonic wave, the sound wave is collected and sent to the receiving transducer to be converted into an electronic signal, and then transmitted to the controller to store the signal information in the normal state. When using a touch panel, touching the pointer will absorb ultrasonic waves and cause attenuation, so the signal when receiving is different from when it is not operating. The controller compares the attenuation before and after use and calculates the precise position. Its advantages are good fire resistance, waterproof, anti-fouling, and poor scratch resistance, suitable for large sizes, but high in price. Generally used in the use of Kiosk or automatic ticket vending machines.
Galanz Microwave Oven Panel Membrane Switch 3. Capacitive
The capacitive touch panel uses the capacitance change produced by the electrostatic combination between the arranged transparent electrodes and the human body to detect its coordinates from the induced current generated. The sensing principle uses voltage to act on the four corners of the screen's sensing area and form With a fixed electric field, when a finger touches the screen, the electric field can cause a current to be generated. The contact position can be calculated according to the ratio of the current to the four corners by the controller. However, the capacitive type must overcome the influence of noise generated by the pointer object due to static electricity, so it is more difficult to design the circuit and structure. When subjected to contact pressure, the position can be calculated according to the current ratio.
4. Resistive
The resistive touch panel mainly consists of two upper and lower ITO conductive layers, spacers, and electrodes. It uses ITO glass as the substrate, and a layer of ITO is superimposed on
Support Panels And Subpanels Membrane Switch Film, with Spacer supports scattered in the middle, so that the upper and lower plates will not be conductive due to the close proximity, and the edges are printed with silver electrodes to provide voltage. When in use, pressure is used to make the upper and lower electrodes conduct, and the controller detects the change in the panel voltage to calculate the contact point position for input. The advantage is that it is waterproof, antifouling, and cheap, but the disadvantage is that it has poor scratch resistance and fire resistance. Generally used in the use of small and medium-sized portable handheld devices.
