Printed circuit board source

Printed circuit board source

The Indian circuit board was created by the Austrian Paul Eisler (Paul Eisler), in 1936, he first in the radio using a printed circuit board. In 1943, the United States and many of the technology used in military radio, in 1948, the United States officially recognized the invention can be used for commercial purposes. Since the mid-1950s, printed circuit boards have been widely used.

Before the PCB appeared, the interconnection between the electronic components are based on the direct connection of the wire to complete and nowadays, the wire is only used in the laboratory to do the application of the test; printed circuit board in the electronics industry has certainly occupied the absolute control status.

PCB production process:

First, contact manufacturers

First need to contact the manufacturers, and then register the customer number, there will be someone for your offer, orders, and follow the production progress.

Second, open materials

Purpose: According to the requirements of engineering data MI, in line with the requirements of the sheet, cut into small pieces of production plate in line with customer requirements of small pieces of sheet metal.

Process: large sheet material → according to MI requirements cutting board → bar board → beer round edging → out board

Third, drilling

Purpose: According to the engineering data, the required aperture is drilled at the corresponding position on the sheet of the required size.

Process: stacking pin → upper plate → drill hole → lower plate → check repair

Four, sink copper

Purpose: Shen copper is the use of chemical methods in the insulation hole wall deposited on a thin layer of copper.

Process: coarse grinding → hanging plate → copper automatic line → plate → dip% dilute H 2 SO 4 → thick copper

Fifth, graphics transfer

Purpose: Graphics transfer is the production of images on the film transferred to the board

Process: (blue oil process): grinding plate → printing the first side → drying → printing the second side → drying → burst light → Chong → check; (dry film process): linen → film → standing → Bit → exposure → standing → punching → check

Six, graphic plating

OBJECTIVE: Graphic plating is on the line diagram of bare copper on the hole or on the wall of the plating layer to achieve the desired thickness of the copper layer with the required thickness of the gold nickel or tin layer.

Process: on the board → degreasing → washing the second → micro-corrosion → washing → pickling → copper → washing → pickling → tin → washing →

Seven, back film

OBJECTIVE: To withdraw the non-linear copper layer from the plating solution with sodium hydroxide solution.

Process: water film: rack → dip → wash → scrub → pass; dry film: release board → machine

Eight, etching

Purpose: Etching is the use of chemical reaction method will be non-line parts of the copper layer corrosion to go.

Nine, green oil

Purpose: Green oil is the transfer of green oil film to the board, play a protective line and prevent welding parts on the line when the role of tin

Process: grinding plate → printing green light → barium plate → exposure → shadow; grinding plate → printing the first side → drying board → printing the second side → drying

Ten characters

Purpose: The character is provided for a recognizable mark

Process: green after the end of the curium → cooling still set → → → → → →

11, gold-plated fingers

OBJECTIVE: To lay a layer of nickel thickness on the plug's finger to make it more hard to wear.

Process: on the plate → degreasing → washing twice → micro-corrosion → washing twice → pickling → copper → washing → nickel → washing → gold

Tinplate (a process in parallel)

Purpose: Spray tin is not covered with solder oil on the exposed copper surface sprayed with a layer of lead tin to protect the copper surface does not erode oxidation, to ensure a good welding performance.

Process: micro-corrosion → air drying → preheating → rosin coating → solder coating → hot air leveling → air cooling → washing air

Twelve, forming

Purpose: through the stamping or CNC gongs gong out of the customer needs the shape of the method of forming organic gong, beer board, gongs, hand cut

Description: Data gong board and beer board with high accuracy, gongs second, hand cutting board with only a minimum of some simple shape.

Thirteen test

OBJECTIVE: To detect the defects of visualization, such as open circuit and short circuit, which are not easily found by electronic 100% test.

Process: on the mold → release board → test → qualified → FQC visual inspection → failed → repair → back test → OK → REJ → scrapped

Fourteen, final inspection

OBJECTIVE: To repair the minor defects by 100% visual inspection of the appearance of the board and to avoid problems and to prevent the defect.

Specific work flow: incoming → view information → visual inspection → qualified → FQA spot checks → qualified → packaging → unqualified → processing → check OK