_{Thin film circuit board}

 

Thin film circuit board is a type of circuit board that usesPET filmMade for substrateFlexible circuit boardAnd it has flexibility.

Thin film circuit boards are widely used in electronic machineryAutomated controlTheInstruments and ApparatusesMedical equipment, consumer electronics, computers, communications, measuring and household appliancesToyswait.

 

 Chinese name

Thin film circuit board

Foreign name

Thin film circuit board

materialmaterial

Made from PET film as the substrate

 

 

1advantage

Thin film circuit boards have many advantages such as good flexibility, light weight, stable transmission performance, impact resistance, low cost, and environmental friendliness. The special price is just ordinaryRigid circuit boardHalf of the PCB. Used in the button area of the product, it can reduce product costs.

IIapplication

2.1Flat film keyboard

Thin film keyboard The buttons on the keyboard are represented by different colors to indicate the position, shape, and size of the key body, which is more common in the initial stage of thin film keyboards. Stereoscopic membrane keyboard: Typically, the keys on a membrane keyboard are only represented by color to indicate the position, shape, and size of the key body. In this way, the accuracy of the operation can only be recognized by the operator's visual perception. Due to the lack of appropriate feedback information indicating whether the finger is pressed within the effective range of the switch to activate the switch, it affects the confidence in monitoring the entire machine and the speed of operation. A way to make switch A thin film keyboard with a slightly raised key body, slightly higher than the panel, forming a three-dimensional shape, is called a three-dimensional key switch. Stereoscopic keys not only accurately define the range of the key body, improve recognition speed, and make the operator more sensitive to touch, but also enhance the decorative effect of the product appearance The production of three-dimensional keys must be arranged in the design stage of the panel, with process holes to ensure precise positioning during mold pressing. The height of the three-dimensional protrusions should generally not exceed twice the thickness of the substrate. For the aesthetic appearance of the product, the protrusion of the raised film keyboard can have various variations.

2.2Hard film keyboard

A hard film keyboard refers to a switch whose graphics and circuits are made on a common printed circuit copper-clad board. The characteristics of a hard film keyboard are convenient material selection, stable craftsmanship, low resistance, and the ability to directly solder certain components in the circuit on its back. In the case of a small area, the hard lining layer can be omitted. Hard film keyboards generally use metal leads as conductive labyrinth contacts, so they have a better tactile feel. The disadvantage is that it is not as convenient to install and connect in the whole machine as a flexible film keyboard, often requiring soldering of plugins and flat connectionsCableLead the lead out. The information feedback of the rigid membrane keyboard includes buzzing signalsIn addition to LED indicators, metal touch pads can generally be used.

2.3Flexible film keyboard

Flexible membrane keyboard is a typical form of membrane keyboard. This kind of film keyboard is called flexible because the facial mask layer, isolation layer and circuit layer of the film keyboard are all composed of software films with different properties.

flexibilityThin film keyboardThe circuit layers are all made of materials with good electrical performancePolyester filmPET serves as the carrier for switch circuit graphics. Due to the properties of polyester film, this film keyboard has good insulation, heat resistance, bending resistance, and high resilience. The graphics of the switch circuit, including the online connection of the switch and its lead wires, are printed with low resistance, low-temperature curing conductive coating. Therefore, the entire composition of the membrane keyboard has a certain degree of flexibility, which is not only suitable for use on flat surfaces, but also can be used in conjunction with curved surfaces. The flexible film keyboard lead out wire and the switch body are integrated. When making the group switch online, they are gathered at a certain part of the film and extended outward according to the designated position and standard wire spacing in the design, serving as a soft, flexible, sealed lead out wire and the rear of the whole machineCircuitto be connected.

 

 

 

——Expo Passsbtpcb

 

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