PCB Technical - What is PCB copy board, basic knowledge of soft board

PCB copy board is also called PCB clone

It is a reverse engineering of PCB design, which is to take the components on the PCB circuit board into a bom order, then scan it into a picture and restore it to a PCB board drawing file by copying software (such as Quickpcb 2005), and then transfer it to The PCB board factory made the board (pcba), stamped with the original bom list, and finally it was the same as the original PCB circuit board. PCB circuit board design software Quickpcb can directly open the scanned color picture copy board. Its component preview, arbitrary angle placement, routing and automatic grid capture, element center functions are comparable to PROTEL, and the file format is compatible with mainstream circuit design software .

The stacking of the stacked pads of the pads (except the surface mount pads) during the PCB copying process means the stacking of holes. During the drilling process, the drill bit will be broken due to repeated drilling in one place., Causing damage to the hole.

In a multi-layer board, two holes are stacked. One hole should be an isolation disk and the other hole should be a connection disk. Otherwise, the film will appear as an isolation disk after drawing, which will be scrapped.

Basic knowledge of PCB copy board and soft board

The proportion of PCB flexible circuit board production has increased, but flexibility and promotion are now more common in soft, hard or just flexible. Said this is the layer PCB of the PCB. Under normal circumstances, PCBs with soft insulating substrates, flexible circuit boards, flexible circuit boards, and rigid-flex complex PCBs are said to be only flexible circuit boards. It adapts to the needs of today's electronic products, develops in the direction of high density, high reliability, small size, and light weight, and also meets the strict economic needs and the needs of market competition.

(1) Classification and their advantages and disadvantages, flexible circuit boards

A. Classification of flexible circuit boards

The conductor layer of the flexible printed circuit board and the structure of the following categories are usually based on:

1.1 Single and double sided flexible circuit board

Single-sided flexible circuit board, only one conductor surface layer can be covered or not covered. The use of insulating substrate materials, different product applications. Commonly used insulating materials are polyester, polyimide, polytetrafluoroethylene, and soft epoxy-glass fiber cloth.

Single and double-sided flexible circuit boards are further divided into the following four categories:

1) Single-sided connection without covering

The pattern on the insulating substrate of this kind of flexible PCB wire, the surface coating of the wire. Like the usual single-sided rigid PCB. These products are the cheapest and are usually used in non-critical and environmentally friendly applications. Interconnect welding, welding or bonding. It is often used in early telephones.

2) Single-sided connection of cover layer

For example, compared with the previous level, but according to customer requirements and multi-layer steel wire surface cladding. The coverage of the cover pad exposed in the end area is simple. The required accuracy may be in the form of a through hole. This is the most widely used single- and double-sided flexible circuit board, the most widely used in automobile instrumentation, and is widely used in electronic instruments.

3) Double-sided connection without covering layer

Such a connection plate interface can be connected to the front and back wires. In order to open the through hole, the hole is in the required position on the insulating substrate, first punching, etching, or other mechanical means, through the pad on the insulating substrate. It is used to install both sides of the equipment and need to be soldered. In the channel of the insulating substrate pad area, such as the pad area, chemical methods are commonly used to remove.

4) Double-sided connection of cover layer

This difference is the surface coating. Cover the route to Hong Kong, and also allow both parties to terminate and still maintain coverage. This kind of flexible PCB is composed of two layers of insulating materials and metal conductor layers. It is used to insulate the soil and the surrounding equipment from each other, and they themselves are insulated from each other. They need to be connected at the end of the positive and negative occasions.