The exposure machine is a new lithography technology developed from the scanning electron microscope foundation in the early 1960s. It has been widely used in semiconductor circuit board manufacturing since the 1970s. The exposure machine is an electronic string exposure machine, which is a complex semiconductor processing equipment integrating electronic optics, mechanical, vacuum, electrical, and computer technologies.

　　Basic working principle of exposure machine:

　　Under the control of a computer, an organic polymer (commonly called an electronic resist or photoresist) is exposed using a focused electron beam. The physical and chemical properties of the photoresist exposed to the electron beam change. The formation of well-soluble or non-well-soluble regions in the solvent results in fine patterns on the resist. The exposure energy of the upper and lower light sources is determined according to the thickness of the circuit of the circuit board. The circuit board cannot be exposed if the energy is insufficient. If the energy is too high, the circuit board will be overexposed. Thus, the exposure production of the circuit board is performed.

　　Christie LED Exposure Machine Advantages:

　　1.More than 90% uniformity;

　　2. The resolution of the circuit board can reach 50μm.

　　3. Energy saving of 80%, no need to replace the lamp tube within four years, no cooling water consumption;

　　4, compact optical combination, so that the parallel half-angle projected by the light source is less than 2 °;

　　5. The exposure area is: 1000mm × 750mm / 1300mm × 750mm / 1500mm × 750mm;

　　6.The vacuum cover is automatically raised to avoid heavy physical labor for employees;

　　7, LED point-by-point correction system real-time, real-time monitoring of the intensity status of each light-emitting unit;

　　8, ultra-high energy, can effectively replace the 8KW / 10KW12KW traditional mercury lamp solder mask exposure machine, exposure time is 20 seconds;