Structural analysis of the light touch membrane switch

　　1. Structure: flexible board (r) and rigid board (y)

　　4, the choice of insulating ink and important technical index: the insulating ink for the lead protection of the membrane switch panel, the insulating ink should be selected first with the conductive ink and the film sheet, which is very helpful for their adhesion. In the membrane switch, Acheson's ed-452ssuv light-curing ink is often used, and the color is bright blue or colorless, and its insulation is 2400 vac/mil. The technical parameters of the insulating ink are:

　　c, light curing energy is controlled at 300-600mi/cm2

　　Screen printing glue can be selected three and fa Kemeilai brand c/tacr110, the glue is suitable for -40~180 °C, suitable for pet, pc, ps, pp, pmma and metal, glass.

　　3) Because the switching action is short, only about 0.25~0.5mm, the switch pressing pressure is 0.5~1n, which is sensitive, and the touch is completed by hand, so it is also called touch switch, or touch the keyboard.

　　Sheet for circuit layer: There are special pets for autotex products.

　　a. The ink for the panel is a solvent-evaporable ink. There are many kinds of inks in this area, but it should be considered from the fineness of the ink, the pure color, the strong hiding power, and the bonding with the base pet. It is proposed to use the German Baolong tj series. , Japan Seiko gap series, Lisa da gv and other series.

　　2), y structure: the switch pattern and circuit are respectively manufactured in the general double-sided printed circuit, the copper plate is broken, through the metallized hole, the negative line is exchanged, and the components are welded on the back side, and the metal guide is used to conduct nothing. The contacts of the labyrinth touchpad are wound with a flat cable lead.

　　e, the silver ink on the screen is not printed silver ink this time, riding the tiger to return to the original tank, should be poured into the net tank, the next use, to ensure the application life of the silver ink in the original tank. Light touch membrane switch supply

　　The hard-coated pc piece has a unique design: autoflexpcg (glossy) autoflexpca (matte)

　　f, pay attention to the contradictory print back color request, generally printed white and silver, its role in preventing the display of the circuit behind the board surface, while not changing the hue of the color ink, and can be printed on the panel first printed ink color more beautiful, Therefore, the back printing ink request is highly concealed, and the choice is inexplicable, the printing is not enough, and the printing can be printed twice to achieve results.

　　c. How to choose and apply the three primary colors with good transparency, so that the bright ink will show high color transparency in the bright window. In the real application, it is found that the degree of transparency is not very good. Another kind of good transparency and wrinkles on the outer surface of the ink layer is very convenient for the transparency. It is necessary to re-select the exquisite inks, such as German Baolong, Japan Seiko, and Lisa Gv series, etc. Orange peel wrinkles should be considered from the pre-press solution of the ink. Make the ink surface slightly wrinkled.

　　a. Clean the ink layer on the back of the panel to improve the power of masking and prevent the circuit after the panel is exposed.

　　2. Classification:

　　b. The upper back of the panel must be screen printed with ink on the back of the panel. The back cover ink can be used with Baolong t-j-944 (white), preferably silk screen silver ink, in addition to the ink, and make the ink color more beautiful.

　　The above only makes some indications about the materials used in the manufacturing process of the light-touch membrane switch, screen printing technology, etc., exaggerating the words, in the production of membrane switches, such as static electricity on the sheet, The problem of color change of the ink and the silk screen and silk screen environment, purification problems, etc. will affect the quality of screen printing. Therefore, it is necessary to accurately adjust and match the screen parameters in the whole process of silk screen printing, the selection of ink characteristics, the hardness of the squeegee, the control of the squeegee angle and the setting of the squeegee speed, which will definitely produce excellent Membrane switch products.

　　Due to its small size, multi-gear position, and good driving force, it has been widely used in many fields such as household appliances. With the continuous improvement of people's living standards, the upgrading of these household appliances is getting faster and faster, and the number of them needs to be larger and larger. This is also the biggest potential direction for us to be optimistic about its development prospects.