3. Some Basic Terms About Printing Boards
On the insulating substrate, according to a predetermined design, a conductive pattern of printed circuits, printed components or a combination of the two is made, which is called a printed circuit. On the insulating substrate, a conductive pattern that provides electrical connections between components is called a printed circuit. It does not include printing components. The finished boards of printed circuits are called printed circuit boards, also known as printed boards. Printed boards can be divided into two categories according to whether the substrate used is rigid or flexible: rigid printed boards and flexible printed boards. Rigid-flexible printed boards have also appeared this year. According to the number of layers of conductor patterns, they can be divided into single-sided, double-sided and multi-layer printed boards. The entire outer surface of the conductor pattern and the surface of the substrate are on the same plane. The printing plate is called a flat printing plate.
After the electronic equipment adopts the printed board, due to the consistency of the same type of printed board, the error of manual wiring is avoided, and the automatic insertion or placement of electronic components, automatic soldering, and automatic detection can be realized, which ensures the quality of the electronic equipment and improves the quality of the electronic equipment, improves labor productivity, reduces costs, and facilitates maintenance. Printing boards have developed from single-layer to double-sided, multi-layer and flexible, and still maintain their respective development trends. Due to the continuous development of high precision, high density and high reliability The direction of development, continuous reduction of volume and cost reduction, make the printed board still maintain a strong vitality in the development process of electronic equipment in the future.
4. V-1 Grade FR-4
FR-4 (flame-resistant laminated sheet) is made of “glass fiber cloth” as the backbone, impregnated with liquid flame-resistant “epoxy resin” as a binder to form a film, and then laminated to form sheets of various thicknesses. The so-called V-1 refers to a sample of copper-free glass fiber epoxy resin substrate with a width of 0.5 inches, a length of 5 inches, and an arbitrary thickness. Measure the number of seconds that it has been burning, and continue burning after it is completely extinguished. After ten consecutive trial burnings, those whose total burning seconds are less than 250 seconds are called V-1 FR-4, and those less than 50 seconds are called V-0 FR-4.
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