Introduction to Film Switch Types

Release date:

2021-08-09

　　Flexible Thin Film

　　Flexible Thin-film switch This is a typical form of a membrane switch. The term "flexible" is used for this type of membrane switch because its mask layer, isolation layer, and circuit layer are all composed of flexible films with different properties. The circuit layer of the flexible membrane switch employs high-performance polyester film (PET) as the substrate for the switch circuit pattern. This layer is further divided into a tactile spring piece and upper and lower circuits. Due to the excellent performance characteristics of the polyester film, the membrane switch exhibits outstanding insulation, heat resistance, bendability, and high resilience. The graphical patterns of the switch circuit, including the switch contacts and their connecting leads, are printed using low-resistance conductive coatings that have been cured under low-temperature conditions. As a result, the entire membrane switch assembly possesses remarkable flexibility, making it suitable not only for use in flat device bodies but also adaptable to devices with curved or contoured designs. Additionally, the leads of the flexible membrane switch are integrally formed with the switch body itself. When assembling the switch connections, these leads are gathered at a specific location on the membrane and then extended outward according to the design's specified positions and standard lead spacing, forming soft, highly flexible, and sealable leads that connect seamlessly to the main circuitry of the device.

　　Dura mater

　　A rigid membrane switch refers to a type of switch where the switch pattern and circuitry are fabricated directly onto a standard printed circuit board with copper foil. Thin-film switch Its features include convenient material usage, stable manufacturing processes, and low resistance, allowing some components in the circuit to be directly soldered onto the back side. In cases where the area is relatively small, the rigid substrate layer can be omitted. Rigid membrane switches typically employ metal conductive tracks as pathways for labyrinthine contact points, resulting in a superior tactile feel. However, their installation and connection within the overall device are less straightforward compared to flexible membrane switches, often requiring the use of flat cables to solder out the lead wires. In addition to buzzer signals and LED indicators, rigid membrane switches generally utilize metal handle spring contacts for providing feedback information.

　　Flat Film

　　Buttons on membrane switches are marked with different colors to indicate the position, shape, and size of the key body, a feature commonly seen in early-stage membrane switch designs. Three-dimensional membrane switches typically rely solely on color coding to convey the location, shape, and dimensions of the keys. As a result, operational accuracy can only be confirmed visually by the user. Without adequate feedback mechanisms to confirm whether the finger is pressing within the effective range of the switch, this approach may compromise confidence in overall system monitoring and reduce operational speed. To address these limitations, a type of membrane switch has been developed where the key body slightly protrudes above the panel, creating a three-dimensional appearance. This design not only enables precise identification of the key area, enhancing recognition speed and improving tactile sensitivity for the user, but also elevates the aesthetic appeal and decorative effect of the product.

　　Protruding Membrane

　　Typically, the keys on a membrane switch are indicated solely by color to represent their position, shape, and size. As a result, the accuracy of operation can only be visually confirmed by the operator. Without appropriate feedback information, both the confidence in machine monitoring and the operational speed may be compromised. Therefore, during the panel design phase, it is essential to incorporate and prepare process holes that allow precise positioning during molding. Additionally, the height of the three-dimensional protrusions is kept uniform across the board.

 

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