Film control system of vacuum film coating machine

  Vacuum film coating machine monitoring the current applications are more, mainly include: visual monitoring method, set (extreme value) value monitoring, crystal oscillation monitoring, time monitoring, etc.. I mainly introduce three kinds of visual monitoring, fixed (extreme value) monitoring and crystal oscillation monitoring.

　Visual surveillance also called direct monitoring, is to use the monitoring eye, because the film in the growth process, due to the interference of color change, we are according to the change of the color to control film thickness. This way has some errors, so is not very accurate, need to rely on experience.

Crystal oscillation monitoring:

Crystal oscillation principle is: the use of quartz crystal vibration frequency and its quality is inversely proportional to the principle of work. But quartz monitor has a bad is when the film thickness increases to a certain thickness, the vibration frequency not completely because quartz itself features make the thickness and frequency between linear relationship, at this time must be using the new quartz oscillating plate.

Several monitoring methods have their own advantages and disadvantages, but usually plated multilayer film, will be mainly based on optical monitoring, quartz crystal oscillation for the auxiliary method.

In addition, there is a need for flow control or pressure control in the process of coating, which requires sophisticated valves and photoelectric sensor systems.

In the coating process also need to turn control system, that is, the main shaft of the umbrella is placed inside the bearing, and then use the motor to drive the bearing, so that the umbrella has a rotary. And then PLC to control its speed of rotation.

The rotary crucible is driven by a motor, and the photoelectric induction counting method is adopted.

In order to speed up the extraction rate of gas to a certain vacuum, also need the vacuum cavity of refrigeration, is the true cavity inside the air freezing to minus 130 degrees Celsius, moisture freezing inside the vacuum chamber and is pumped out.

The electric control part adopts PLC automatic control, is the first in the PLC input pre design procedures, main processor circuit and operation panel on the air of the drive system is connected, when you press the switch on the operation panel, information is passed to the central processor, the central control system analysis and issued a directive by branch execution and completion of the action.

Coating machine is a set of equipment of multi discipline, which integrates the current industry the most advanced mechanical and electrical technology, control technology, electrical automation, information technology, refrigeration technology, micro integrated circuit system, pressure control system, mechanical technology, processing technology, photoelectric technology, optical technology, ion beam sputtering coating machine technology, photoelectric sensor technology, communication technology, vacuum technology, optical thin film and coating technology and so on.

It can be said that the coating machine is a new industry representative.

Today, the coating machine has been widely used of plating film is especially widely, the production of a variety of thin films is applied to the optical system and optical apparatus, such as digital camera, digital camera, telescope, projector, energy control, optical communication, display technology, interferometer, satellite missiles, semiconductor laser, micro electromechanical systems, information industry, laser production, a variety of filters, lighting industry, sensor, architectural glass, automobile industry, ornaments, coins, glasses and so on, coating machine has with the human life closely linked.

A imported coating machine cost usually reaches 300 ~ 1000 million RMB, domestic equipment the cost of construction is about 100 million, the imported equipment has a fully automated, the entire production process automatically by computer, the advanced level definitely better than the world any automatic operation mode, due to the late start of the domestic vacuum technology, plus Technology Co., so up to now also uses manual mode of operation, some manufacturers have draw lessons from the mode of operation of the imported equipment can be reached the semi automation mode of operation, such as: Chengdu Nanguang coating machine, Dele (Suzhou) Precision Instrument Co., Ltd., in the industry has the position.