PCB News - FPC flexible electronic devices and professional terms 1

FPC refers to the flexible electronic device PCB circuit board. The flexible circuit board should be made of polyimide or polyester film. Commonly known as flexible circuit board or FPC, it has the characteristics of high wiring density, light weight, and thin thickness.

The key applications of FPC are in many products such as mobile phones, notebooks, PDAs, digital cameras, LCMs, etc. The following online introduces the common related professional terms of FPC in detail for everyone.

1. Access Hole (exposed hole, exposed bottom hole) refers to the thickness of the protective layer on the surface of the flexible circuit board. Coverlay (the hole that must be punched out first) is used to cater to the surface of the flexible circuit board as a solder mask. The main purpose. However, it is necessary to accidentally expose the hole ring hole wall or square welding pad necessary for electric welding to facilitate electric welding of parts. To put it bluntly, the full text of "Access Hole" means that the surface has exposed holes so that the outside can be "closed" to the surface under the protective layer. Some solid wood multilayer boards also have such exposed holes.

2. Acrylic is an alias for polyaliphatic resin. Most of the flexible circuit boards are made of plastic film, which is used as the main purpose of the film.

3, Adhesive glues or adhesives Chemical substances that can bond the two sockets, such as epoxy resin or architectural coatings.

4. Anchoring Spurs can be used on medium-thick plates or single-sided aluminum substrates. In order to make the ring pads have stronger adhesion characteristics on the surface, they can be used on unnecessary yards outside the ring. Attach a few finger claws to make the eye ring more advanced to reduce the chance of floating from the surface.

5. Bandability, bending work ability is the characteristic of Dynamic Flex Board (Dynamic Flex Board), such as the continuation of the flexible circuit board of the printer nozzle of the electronic computer disk drive (Print Heads), and its quality is It should be more than 1 billion times of "bending test".

6, Bonding Layer, then layer refers to the film layer of solid wood multilayer board, or TAB tape, or the board of flexible circuit board, the adhesive layer between the copper skin and the polyimide (PI) board.

7, Coverlay/Cover Coat surface protection layer, thickness of the protection layer The surface route of the flexible circuit board, its solder resist is not easy to use the green paint commonly used for hard boards, because it will fall off when it is bent. It needs to be changed to this kind of soft plastic "acrylic" laminated on the surface, which can be used as a solder mask and maintain the surface route, and improve the resistance and durability of the flexible circuit board. This kind of special "outer film" "Specially referred to as the surface protective layer or protective layer thickness.

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