The purpose of the time relay is to implement the delay command in accordance with the process requirements. There are many types of relays: such as electrical quantity relays (the input quantity can be current, voltage, frequency, power, etc.), non-electrical relays (the input quantity can be temperature, pressure, speed, etc.); protection relays, control relays; Contact relays, non-contact relays; open type (no protective measures for main components), enclosed (plus protective housing), sealed (no gas and electric energy mass exchange inside and outside the housing) relays, etc. Commonly used relays classified by working principle include electromagnetic relays, polarization relays, reed relays, thermal relays, and time relays. An automatic electrical appliance whose electrical output circuit is switched on or blocked when the physical quantity of the input reaches a specified value. Widely used in production process automation devices, power system protection devices, various types of telecontrol, remote control and communication devices, is one of the most basic electrical components in modern automatic control systems. The input signal continues to increase and the output signal remains at YMAX. After the relay is activated, if the input signal is reduced, the relay will only operate when the input is reduced to XF, return to the starting position, and the output signal will jump back to zero. This property is called the relay characteristic. Here, the input value (operation value) for starting the relay operation, the input maximum value (return value) for returning the relay to the original state, the rated voltage and current of the contact (contact rated value), and the relay are one state. The time (action time) to change to another state is the main technical parameter of the relay. They both characterize the performance of the relay's working process and are the basis for the selection of relays. After the 20th century, regarding the use of time relays, relays have developed greatly. Magnetic contactless relays, semiconductor contactless relays, ASIC-like electronic time relays, solid state relays, and printed circuit board mounted (double-row straight) Plug-in relays, as well as protective relays and intelligent relays with microprocessors. The relay is generally composed of an input sensing mechanism and an output actuator. The former is used to reflect the change in input quantity, the latter completes the contact splitting action (for contact relays) or the switching of semiconductor components (for non-contact relays), and the relay has jump input-output characteristics. When the relay receives an input signal X, only when it reaches the action value XD, the relay operates and the output jumps from zero to YMAX. The time relay is an important component in the electrical control system. Generally divided into two types of power-on delay and power-down delay. From the principle of action, there are electronic and mechanical types. The electronic method uses the principle of capacitor charging and discharging and then matching electronic components to realize the delay action. There are many mechanical styles, such as airbags that use airbags and springs; watch escapement devices, which introduce some types and characteristics of time relays; there are also small-sized pole-synchronous motors that drive cams, and now there are more new ones. The time relay appears.
Oca Sheet
OCA (Optically Clear Adhesive) glue sheet is a type of adhesive film that is used in the assembly of electronic devices, particularly in the display industry. It is a transparent and optically clear adhesive that is used to bond different layers of a display module together. OCA glue sheets are commonly used in the manufacturing of smartphones, tablets, and other electronic devices with touch screens or LCD displays.
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The main purpose of OCA glue sheets is to provide a strong and reliable bond between the layers of a display module, while also ensuring optical clarity and minimal distortion. It helps to eliminate air gaps and improve the overall visual quality of the display by reducing reflections and enhancing color vibrancy.
OCA glue sheets are typically made of a high-quality acrylic material that is optically transparent. They are available in various thicknesses and sizes to suit different display applications. The sheets are usually pre-cut to the required dimensions and then applied to the display layers using a lamination process.
Overall, OCA glue sheets play a crucial role in the manufacturing of electronic devices with displays, providing a reliable and visually pleasing bonding solution.