The PCB of the core board can be categorized into core single-sided, core double-sided, and core multilayer boards based on the number of layers. In terms of materials, they can be classified into flexible PCBs (flexible boards), rigid PCBs, and rigid-flex PCBs (rigid-flex combined boards), among others. The printed circuit board is a crucial electronic component and serves as the foundation for electronic components. This article will provide a brief overview of these types of core board PCBs.
1. Classification based on the number of circuit layers of the core board: it is divided into single-sided, double-sided, and multilayer boards. Common multilayer boards typically consist of 3 to 6 layers, while more complex multilayer boards can exceed ten layers.
(1) **Single-Sided Panel**
On the most basic printed circuit board, components are concentrated on one side while the wiring is found on the opposite side. Since the wiring appears solely on one side, this type of printed circuit board is referred to as a single-sided board. Due to stringent restrictions on single-sided circuits (where wiring cannot cross and must maintain distinct pathways), these boards were primarily used in early circuit designs.
(2) **Double-Sided Panel**
This type of PCB features wiring on both sides. To connect the circuits on either side, a proper circuit connection is necessary, known as a via. A via is a small hole that is filled or coated with metal on the printed circuit board, allowing for connectivity between the wires on both sides. Since the area of a double-sided board is double that of a single-sided board and the wiring can interweave, double-sided boards are suitable for more complex circuits than their single-sided counterparts.
(3) **Multilayer Board**
To increase the available wiring area, multilayer boards incorporate multiple single or double-sided wiring boards. A multilayer board consists of several double-sided boards, each separated by an insulating layer and securely bonded together. The number of layers in a PCB indicates the number of independent wiring layers, typically with an even number that includes the two outermost layers.
2. **Classification by Core Material Type:** flexible circuit boards, rigid circuit boards, and rigid-flex boards.
(1) **Flexible PCB**
A flexible board is a printed circuit board made from a flexible substrate. Its main advantage is its ability to bend, facilitating the assembly of electrical components. FPCs are widely utilized in aerospace, military applications, mobile communications, laptops, computer peripherals, PDAs, digital cameras, and various other products.
(2) **Rigid PCB**
This type of board is constructed from paper-based materials (typically for single-sided boards) or glass cloth (usually for double-sided and multilayer boards), pre-impregnated with phenolic or epoxy resin. Copper foil is laminated on one or both surfaces and then cured. This copper-clad board is known as a rigid board, and when configured as a PCB, it is termed the core PCB. Rigid boards are composed of a sturdy base material that resists bending, providing reliable support for the electronic components attached to them.
(3) **Rigid-Flex PCB**
A rigid-flex board is a printed circuit board that incorporates one or more rigid areas alongside flexible sections, created by laminating a rigid board with a flexible board. The advantage of rigid-flex boards lies in their ability to offer the structural support of rigid printed boards while also possessing the bendability of flexible boards, accommodating the needs of three-dimensional assemblies.
1. Classification based on the number of circuit layers of the core board: it is divided into single-sided, double-sided, and multilayer boards. Common multilayer boards typically consist of 3 to 6 layers, while more complex multilayer boards can exceed ten layers.
(1) **Single-Sided Panel**
On the most basic printed circuit board, components are concentrated on one side while the wiring is found on the opposite side. Since the wiring appears solely on one side, this type of printed circuit board is referred to as a single-sided board. Due to stringent restrictions on single-sided circuits (where wiring cannot cross and must maintain distinct pathways), these boards were primarily used in early circuit designs.
(2) **Double-Sided Panel**
This type of PCB features wiring on both sides. To connect the circuits on either side, a proper circuit connection is necessary, known as a via. A via is a small hole that is filled or coated with metal on the printed circuit board, allowing for connectivity between the wires on both sides. Since the area of a double-sided board is double that of a single-sided board and the wiring can interweave, double-sided boards are suitable for more complex circuits than their single-sided counterparts.
(3) **Multilayer Board**
To increase the available wiring area, multilayer boards incorporate multiple single or double-sided wiring boards. A multilayer board consists of several double-sided boards, each separated by an insulating layer and securely bonded together. The number of layers in a PCB indicates the number of independent wiring layers, typically with an even number that includes the two outermost layers.
2. **Classification by Core Material Type:** flexible circuit boards, rigid circuit boards, and rigid-flex boards.
(1) **Flexible PCB**
A flexible board is a printed circuit board made from a flexible substrate. Its main advantage is its ability to bend, facilitating the assembly of electrical components. FPCs are widely utilized in aerospace, military applications, mobile communications, laptops, computer peripherals, PDAs, digital cameras, and various other products.
(2) **Rigid PCB**
This type of board is constructed from paper-based materials (typically for single-sided boards) or glass cloth (usually for double-sided and multilayer boards), pre-impregnated with phenolic or epoxy resin. Copper foil is laminated on one or both surfaces and then cured. This copper-clad board is known as a rigid board, and when configured as a PCB, it is termed the core PCB. Rigid boards are composed of a sturdy base material that resists bending, providing reliable support for the electronic components attached to them.
(3) **Rigid-Flex PCB**
A rigid-flex board is a printed circuit board that incorporates one or more rigid areas alongside flexible sections, created by laminating a rigid board with a flexible board. The advantage of rigid-flex boards lies in their ability to offer the structural support of rigid printed boards while also possessing the bendability of flexible boards, accommodating the needs of three-dimensional assemblies.