Membrane switch keyapds embossing design

Many membrane keyboard overlay applications require embossing in order to aid in tactile response or for the operator to easily locate the keys. Embossing is generally done to accentuate the key area of a graphic overlay or membrane switch. Keypad embossing can either be rim (perimeter) or pillow (pad).

Embossing may also raise LED’s above the surface of an overlay, or provide a decorative effect to a border or logo. Braille can also be embossed on your part.

Embossed specifications are as follows:

1,The material thickness can be up to .010". Embossing thicker gauge materials up to .020" is attainable with limitations.

2,The minimum embossing width is .040” for .005” to .007” material and .050” for .010” material. The maximum recommended emboss height is 2.5 times the material thickness. Embossing heights in excess of this recommendation can be achieved with limitations. Forming processes are also available for specific applications. Please consult Sterling’s Design Engineers for additional information.

3,Emboss spacing is recommend at a minimum of .050”spacing between embossed areas.

4,Standard emboss registration is +/-.010” (registration to graphic image.) In some conditions a tolerance of +/- .005" can be achieved, but this will result in a higher cost due to increased spoilage and slower running speeds. Emboss to emboss spacing tolerance is +/- .005".

5,Embossing tooling is typically a matched male/female tool set for overlays, panels and membrane switches. The most common types of tooling are made of brass, copper, magnesium, or plastic resins. It is common for plates to be heated during the embossing operation if a polyester substrate is selected. Each tool is custom made.

6,Embossed areas that are backlit must be taken into consideration and should be specified on the blueprint.

7,If adhesive backing is required on the embossed graphic overlay, it is recommended that the adhesive be held back from the embossed areas.

JCF technology Design Engineers can provide more information for your specificapplication.(Email:jcf@jcftechnology.com)