The control unit for exposure photoresist

Abstract

One of the most commonly used technologies for developing electronic devices is the use of printed circuit boards. Often there is the need to create PCBs in small amount, for example, for experimental production, training laboratories, etc. It is important to create a device that will simplify and make the process of production of printed circuit boards for small-scale production more effective. The basis of the methods of manufacturing printed circuit boards is the removal of a copper layer from a metallized dielectric. Before removing it is necessary to protect the necessary areas. In the device that is being developed, for this purpose it is planned to use the photochemical method. As a protective layer photoresist is used - a substance that changes its internal structure under the action of ultraviolet еxposure. The use of a photomask can expose the necessary areas, creating a protective layer. An LED will be used as a source of UV radiation, as it has a number of advantages over mercury lamp: longer life span and stable illumination that instantly reaches the required wavelength and does not require calibration. In addition, there are advantages in overall dimensions and cooling system, which is much easier to implement for LED technology. An important factor is the exposure time of the photoresist. Incorrect exposure can lower printed circuit board quality. Exposure limiting is done using a time controller. The main elements of the device are the following blocks: the input block - an encoder containing a button in its design; As a control unit, the STM32F103S8T6 chip series of the ARM family of microcontrollers is used as the most functional and economical. Information output will be carried out on an LCD screen that has no limitations on the type of information to be output. The lighting unit consists directly of the UV light-emitting diode and voltage converter to ensure the technical conditions of the LED. Thus, the undeniable advantage of the device is its low cost through the use of inexpensive components of the element base. In addition, the compactness and portability of the device facilitates its storage and maintenance, does not create complications during its placement. It should be emphasized that the adjustment of all parameters of the device is built in one regulator, which greatly simplifies its operation. All of the foregoing proves that we have developed a device that will provide a reliable and at the same time a simple photoresist exposure process in the laboratory and does not require the user to have high technical awareness. Such a device will be useful in school and university classrooms, in experimental and research laboratories. Библ. 8, рис. 1, табл. 1.

Keywords

References

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Copyright (c) 2019 Дмитро Сорокін, В. Г. Губар (Автор)