Open Cavities PCB from buzai232's blog

Open Cavities PCB. What is Cavity PCB? Defined as a hole (Cutouts ) in the PCB going from the outer copper layer to an inner copper layer, but not completely through the PCB. The use of cavities in a PCB as a method to reduce the component height or to increase component clearances is a viable technology.To get more news about Cavity PCB, you can visit pcbmake official website.

Open Cavity PCBs require a depth-controlled cutout to expose inner layers to air for antenna or component assembly. Alcanta PCB factory produce many kinds Cavity PCB boards. Cavities on PCB boards. Most of the design. you have to put some main IC (parts) in the cavities. Yes. we can produce this kinds Cavity boards with high quality. we can make the cavity pcb from 4 layer to 70 layers. most of the cavity are from 4 layer to 16 layers.

In some especial domain. The cavities pcb will use High Speed pcb materials, High Frequency PCB materials, Metal materials, High TG FR4 materials, or other different PCB materials. we can produce all of these kinds materials cavities boards. High quality, and more cheaper price. When you design this kinds cavities PCB. if you have some questions. you can check with us. we will help you any time. no need any payment. Just technical exchange.Low-flow PP + controlled depth milling process or inner filling silica gel materials are usually used. However, there are many control points and complex operation process in the manufacturing process of this kind of stepped/cavity board, which has the following problems.

Deviation:Core board and PP need to be slotted first, then pressed. Laminating is prone to offset and the size of cavity is deformed.

Gum flow:Usually, the slotting size of PP is 0.5mm larger than that of cavity. At this time, the gum flow is serious and the bottom of cavity is overflowing with gum.Increasing the slot of PP to 1.0mm makes the cavity area prone to depression and the upper and lower core boards prone to loss of dielectric layer leading to conduction.

Material breakage:With the development of miniaturization of PCB board, the thickness of board and the depth of cavity tend to be miniaturized. The board is thinner and thinner, and the cavity is shallower and shallower. Using conventional technology to make step cavity, the cavity area after lamination is prone to depression or even rupture.

Solve the problem of material damage:Conventionally, we use lasers to make HDI blind holes, for which we can use laser to make blind cavity. However, low-energy drilling should be used to ensure that the copper surface at the bottom of the cavity is not harmed.

Solution of gum flow:Conventional prepreg is low-flow, but when using high-frequency materials, PP has a certain flow gum, which cannot be solved by window opening, so it can only be solved by laser removal.

Solving Deviation:Because the core board is pressed directly without slotting, the copper in the cavity position is etched into a light plate, which is subsequently made by laser drilling, the problem of uneven cavity wall caused by deviation is well solved.

Difficulty Analysis:Because of the laser drilling cavity, the arrangement of the inner hole and the setting of laser energy is very important for the cavity. Through the experimental verification of different high frequency material, many practical data have been obtained on the setting of laser energy and the arrangement of laser holes, which fully realizes the machinability and reliability of the cavity.