Membrane Keyboard

Flexible Membrane Keyboard/Switches

A membrane Keyboard has two screen printed polyester films with conductive ink to form the circuit layer of the Keyboard. Between the two circuits, a die-cut spacer at contact points is placed. To complete the circuit a touch of finger on the die-cut holes allows to close the contact. Upon release, the circuit is broken. User can specify the specific key contacts through a Graphic overlay. For interfacing with the customer’s electronics, the panel back is laminated with an adhesive for mounting on a backer or enclosure which can be terminated to a male/female clincher connector.

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Hybrid Membrane Keyboards/Switches

Rigid Printed circuit board switches are utilized in situations where the OEM customer may like to utilize the PCB as a rigid backer which a membrane keyboard lacks. The PCB can also be populated with active and passive components reducing the amount of materials and interconnections.

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Common Specifications

Item Characteristic Value
Electrical Characteristics Contact resistance 100 ohm or less
Insulation resistance 100m ohm or more at 100V DC
Withstand voltage 125V AC for 1 minute
Contact bounce 15 m sec or less
Mechanical characteristics Operation load 50-450g
Stroke More than 0.1 mm
Environment properties Operation life Over 5 million
Operating temperature and humidity -10°C to +50°C at 90% RH or less
Storage temperature -25°C to +70°C

Information Required from Clients

In order to offer you the exact product as per your specs, it is recommended that you provide the following information to us
Keyboard can be made with different specs depending on your application. Mainly we need three kinds of information to start a job:

Mechanical

Electrical

Graphical/Aesthetical


Mechanical

Here you are requested to give dimensions of Keyboard, Display & LED locations, stud size & its location, switch size & its location, connector location and tail length and its location etc.


Electrical

Here you are advised to provide a detailed circuit diagram (logic Diagram) of electronic components with component specifications including pin numbers of connector. However we recommend to provide us the freedom to select connector pin numbers so that we can minimize the cross connections and reduce the complexity and improve the reliability of the Keyboard. In case of flexible membrane Keyboard, cost of the product will reduce as well.


Graphical & Aesthetical

It is important to select proper overlay material depending upon the application. The most common and economical material is Polycarbonate. We use special grade polyester which is very suitable for embossing and gives good chemical and scratch resistance. In order to make a impressive and attractive overlay, it is important to choose proper color, shade, font size, font shape etc.


Our graphical designers can provide a good design after customer provides the following details

Application of the product (consumer, industrial, medical) etc.

Enclosure color

Functional characteristics of LED & Switch

You can choose a combination of matt and glossy finishes on the overlays. We can provide background illumination on selective areas of the Keyboard (Electro-Luminescent Technology)
The aesthetic look of the Keyboard can be further enhanced by embossing the switch and LED areas.