The structure of membrane switch is more reliable

The structure of the membrane switch is more reliable. The membrane switch can be divided into two types: touch type and non-touch type. The non-haptic type usually has a Planar non-haptic type and a convex key frame (sometimes a convex blind spot) non-haptic type. Non-contact thin-film switches do not need to feel, but require higher sensitivity. Touch can be opened, but will not short circuit when not pressed, so should be in the next circuit key body to add a reasonable isolation point. In the early days of the touchless membrane switch, keys were color coded to indicate the location, shape, and size of the key, which the operator could visually identify. To facilitate operation and improve accuracy, the panel was later designed as a raised button edge or raised blind spot. In recent years, capacitive membrane switches have replaced many Planar non-tactile membrane switches. There are many kinds of structure of touch-film switch, the most classic are convex bubble touch and shrapnel (small pieces) touch.CONVEX tactile is a common form of circuit, the face plate is convex and two forms of Convex, the circuit removed some ultra-thin structure, circuit contact directly printed on the face plate. The convex bubble of the membrane switch is formed by hydraulic heating of the die, which makes the binder slightly higher than the panel, forming the three-dimensional shape of the membrane switch. The material has good selective toughness and thermal shrinkage, and hot-pressure bubble formation rebound, therefore, the convex bubble touch film switch feel good, piezoelectric performance is sensitive, but do not pay attention to long-term use in high temperature environment, high temperature will lead to the feeling of the bonding body weakened. When the upper loop is not convex, the position of the filter in the exhaust slot should be considered. There is a small air hole in the upper loop and, if necessary, a reasonable isolation point should be added to the contact point of the lower loop to avoid potential danger of short circuit and wiring. If the contact is printed directly on the panel, it should be considered that the deformation size of the panel after high temperature aging is too large, the high temperature baking time is too long, the deformation is too large, the membrane switch assembly is not easy to stick, the high temperature baking time is too short, and the contact aging time of the panel is not enough, easy to wear and tear contact, shorten product life.Shrapnel (can) touch the diaphragm switch, refers to the shrapnel fixed in the lower circuit, forming a pole for the upper circuit circuit circuit, when the shrapnel is squeezed, another pole and the lower circuit to form a circuit. The elastic sheet touch film switch button design diversification, makes the product more stable reliable, simultaneously enhances the product decoration effect, achieves the perfect appearance effect. The panel can be designed into a plane, a convex sphere, a convex plane, the shape can be circular, square, triangle, etc. . When the key design is flat or Convex, the surface of the plastic layer should be thickened, there should be enough space for the shrapnel to move freely and contract, if it feels bad, add a small washer behind the panel button, the design of the fixing layer can be divided into two forms: Piercing (the aperture should be less than the diameter of the shrapnel) or bubbling at the corresponding key position. The second structure of the tactile type of hand grenade is the direct addition of the grenade to a key part of the upper circuit to enhance the hand feeling. When the number of keys is very large, the overall shape is very small, and there is no wiring space, the design of the upper and lower circuit structure adopts this structure, but the sensitivity of this structure is weaker, the pressure is bigger, the finger loosens the time is longer, sometimes the hand is pressed, hearing the sound of the grenade, the circuit did not perform this phenomenon.The membrane switch is embedded in two structures: The LED circuit and the sub circuit. The structure of the same layer circuit and the circuit below is relatively simple, but the led window should be bubbling, otherwise, the led lamp will push the panel, at the same time, the led lamp is also easy to be damaged because of heavy pressure, choose 0603 led lamp height is lower, but the pad is smaller, difficult to weld, the Height of 0806 led lamp is 0.8 mm, the pad is bigger, the virtual welding is less, the structure of different level led lamp and the circuit below are more complex, but the thickness of the whole film switch is thicker, and the led window does not need bubbling. Thin-film switches use leds to provide more static shielding on the panel, which is more susceptible to breakdown in bright green and blue colors, especially in winter. Two kinds of waterproof structure, waterproof structure is generally designed as recessionary embedded structure, one structure is the same material two parts finished product, circuit part embedded panel part finished product. This structure is more commonly used, each layer of glue are waterproof glue, another structure is the use of the upper and lower circuit and insulation layer thickness of the material, made by the panel of the membrane switch frame structure, the circuit part of the whole embedded. Waterproof Glue can be used in 3m9495le or 3mgtm920.The light guide structure is to embed the light guide device into the traditional film switch, and adopt the side light guide button (also can use the electric cold light) . The utility model enables the membrane switch to be used at night and in places with insufficient light, and has more ornamental property. When making photoconductive membrane switch, must consider the panel and membrane switch side can not leak light and light, all double-sided glue to use black glue. Add light guide plate after the key feeling will be weakened, in the panel after the key position add shim, enhance the feeling. When the number of keys is particularly large, the overall shape is small, no wiring space, but also consider the folding structure. Designed as an up-and-down circuit. The structure pays particular attention to the folding process under heating conditions, taking into account the effect of extended service life on bending. Each structure has its own characteristics, the initial choice of design the most appropriate structure, the production of high-quality products, service users.