Double-sided circuit board characteristic
The difference between a single-sided circuit board and a double-sided circuit board is the number of copper layers. Double-sided circuit board is both sides of the circuit board with copper, can be connected through the hole. Only one layer of copper on the single side can be used for simple lines, and the holes can only be used for plugins. The technical requirements of double-sided circuit boards are higher wiring density, smaller aperture, and smaller and smaller aperture of metallized holes. The quality of the metallized hole on which the interlayer interconnection depends is directly related to the reliability of the printed board. With the reduction of the pore size, the original has no effect on the larger diameter of the sundries, such as brush debris, ash, once remaining in the hole, will make the chemical copper, electroplating copper lost effect, hole without copper, become the fatal killer of the hole metallization.
Welding method for two – sided circuit boards
Double-sided circuit board in order to ensure that the double-sided circuit has a reliable conductive effect, should be first of all with wires such as welding the connection hole on the double panel (that is, the metallization process through the hole part), and cut the connector tip protruding part, so as not to hurt the operator’s hand, this is the board of wire preparation.
Welding essentials of double-sided circuit board:
1. The required shaping devices shall be processed according to the requirements of the process drawings; That is, after plastic plug-in.
2, after shaping the diode model face should be up, should not appear two pin length inconsistent phenomenon.
3. Note that the polarity of the device with polarity requirements shall not be inserted in reverse during the device instrumentation. After instrumentation, no matter the device is vertical or horizontal, there shall be no obvious inclination.
4, the power of the welding iron is 25~40W, the temperature of the tip should be controlled in 242 ° c or so, the temperature is too high easy to “die”, the temperature is too low to melt the solder, the welding time is controlled in 3~4 seconds.
5, when the formal welding is generally in accordance with the device from low to high, from the inside out of the welding principle to operate, welding time to master, too long will iron the device, will iron the copper clad wire.
6. Because it is double-sided welding, we should also make a process frame to place the circuit board and so on, so as not to press the device below the inclination.
7, after the completion of the circuit board welding should be a comprehensive number of seat type inspection, check the leakage plug leakage welding place, after the confirmation of the circuit board excess device pins and other trim, flow to the next process.
8. In the specific operation, relevant technical standards shall be strictly followed to ensure the welding quality of products.
With the rapid development of high technology, the electronic products closely related to the public are constantly updated, the public also needs high performance, small size, more functional electronic products, which put forward new requirements for the circuit board. Double-sided circuit board is therefore born, because of the widespread use of double-sided circuit board, promote printed circuit board manufacturing to light, thin, short, small development.