Introduction to the advantages of thin film touch switch
Release time：2018-10-17 Clicks： Click
What advantages do film tactile switches have? Why do we all like to use such switches? Specific reasons for the following detailed introduction to you.
Light touch switch type has standard type, sealed type, SMD type, waterproof type, swing bar type, long type, vertical type, semi-circular array thin type, contact silver plating, gold plating, installation forms mainly include insert welding, insert pin type, surface mounting, size of 4.5 x 4.5mm, 6 x 6 mm, 6.6 x 6 mm, 8 x 8 mm, 10 x 10 mm, 12 x 6 mm * 12mm and so on. What aspects of specific application areas are included?
Advantages are suitable for high-density surface mounting, some can be cleaned after welding, sealed dustproof, the most suitable for harsh environment selection, simple circuit design, product life range from 100,000 to 10 million times, the product has become a series.
Thin film touch switches have become one of the most demanded switch categories in China. Portable consumer digital electronic products and instruments are the most widely used fields. For example, a color TV needs 6 switches and a set of combined audio needs about 20 switches.
Today, the application scope of membrane touch switch is still expanding. The main fields are video electronic products touch switch, household appliances, medical electronic products, car audio, portable electronic products, automatic control systems, testing and measuring instruments, etc. The market needs continue to be optimistic, and the competition between businesses is becoming increasingly fierce. It is mainly manifested in the specialization of production, more and more automation, production has been increasingly concentrated in a few powerful, large-scale enterprises, coupled with the falling price, profit margin is becoming smaller and smaller, some smaller enterprises have the idea of withdrawing from competition.
The key factors affecting the quality of the light touch switch are the protection, solderability, conduction reliability, life, feel, production process and installation size of the light touch switch. Pins are basically silver-plated. SO2 gas in the air will oxidize when silver meets, which directly affects the solderability and contact resistance of the switch. Therefore, high-quality light-touch switches should be controlled in the thickness of the base material and silver-plating process of the pins. The order of silver-plating in the market is as follows:
Silver touch thickness: 0.3um above (Hou Yin), 0.2um (Bo Yin), 0.1um (white).
Silver plating process: the substrate is pre plated with nickel and then silvered, the substrate is pre plated with copper and silver plated, and the substrate is directly plated with silver.
Whether the base material is treated with protective agent after silver plating or whether the switch has the function of dustproof and waterproof is very important, or even the best silver plating treatment, the switch will be oxidized.
Secondly, the key influencing factor of conduction reliability is the structure of the contact point, because the function of the light touch switch is to conduct contact between the contact point and the elastic fragment, then the larger the contact surface, the better. The contact surface is determined by the structure. There are probably three types of structures in the market. The order of merits and demerits is as follows:
Bulla (volcano mouth type) "O type contact", slotted "2 point contacts", flat bubble type "1 point contact".
Thirdly, the life and feel of the switch are determined by the stroke of the light touch switch and the matching of the shrapnel. The shorter the stroke, the lighter the sound, the longer the life, and the longer the stroke. On the contrary, in the case of fixed shrapnel technology, the life of the switch is mainly determined by the stroke or sound.
In addition, the key factor to determine the life of shrapnel switch or stamping technology, Japan and Taiwan's stamping technology has been relatively popular in China, so in the case of technical upgrading, whether the requirements for imported materials are further reduced, such as 160gf shrapnel life in the market is mainly four kinds: about 50,000 times (domestic copper phosphate) Or relatively backward stamping technology), about 100 thousand times, more than 200 thousand times (stainless steel).
The fourth is the production process, with accessories after the final impact on the quality of the assembly process, assembly process depends on the production company's management capabilities, staff quality awareness and quality assurance capabilities and other factors to determine the final product quality of different assurance capabilities must be different, market assembly methods have man-made and machine, machine group Low cost, low quality, high cost and high quality.
Fifth, factory inspection, factory inspection methods and items also affect the quality of the final touch switch, such as appearance, feel, conduction, resistance and other items are spot inspection or full inspection, for example, some large factories require scrap rate to be measured by PPM or zero defect, we must set up spot inspection or product after factory inspection set up full inspection. Quality inspection procedures.