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THERE’S NOTHING LIKE TAILOR-MADE PRODUCTS.

professional and innovative keypad solutions

Kohlstädt GmbH

[email protected]

Möllberger Str. 6-14, 18

D-32602 Vlotho-Uffeln

phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50

Additional information available at

www.kohlstaedt.deFB-VK-016_1_13-09

Create keypads for all kinds of equipment and product categories based on your own concepts and plans. From development right through to realisation, we will carefully consider and hone your ideas together with you to ensure that a no-nonsense solution is achieved which is optimised for the specific application concerned.

Our approach centres on the function and integration of the-se interface elements. Within this context, we think it is important to provide opti-mum user friendliness, whilst at the same time preserving the simplicity and attractiveness of the design. We insist on a low-maintenance and ergonomic design that exudes style and also allows complete flexibility in terms of creating my-riad bespoke solutions. Our technicians and developers will be happy to assist you with the initial planning phase.

Here are some of the options we offer

• Transparent polyester films of various thicknesses

• Partially structured, with non-reflecting coating

• With viewing windows that are either crystal clear or have an

antiglare coating

• With backlit effect for light-emitting diodes and LED displays

• With electroluminescent film

• With flat and embossed keypad/with embossed edges

• Without mechanical pressure point or with tactile feedback

• Self-adhesive

• Permanently bonded to a carrier plate made from aluminium,

sheet steel or plastic

Keypads

Our membrane keypads ensure problem-free operation.

Suitability for extreme conditions

pecial requirements are often imposed on membrane key-pads such as “suitability for use in tropical climates”. In re-sponse to this particular challenge (like so many others), we can once again offer the ideal solutions. All we ask is that the requirements to be imposed on the final product are pre-cisely defined and properly discussed at the enquiry stage.

In particular, we must be made aware of any UV and wea-ther-related influences in advance, as it is not generally pos-sible to rely on standard materials in such cases.

The following pages provide details of the standard values associated with our various keypads. However, if you cannot find exactly what you are looking for in terms of characteristic values, please do get in touch, as we will generally be able to identify suitable materials and approaches.

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Transparent polyester films of various thicknesses, structured and with a non-reflecting coating, with viewing windows that are either crystal clear or have an antiglare coating, with cut-outs for screens and displays, with backlit effect for light-emitting diodes and LED displays, electroluminescent film, with flat and embossed keypads or keypads with embossed edges, without mechanical pressure point or with tactile feedback, self-adhesive or permanently bonded to a carrier plate made from aluminium, sheet steel or plastic.

Lettering (in every imaginable colour) applied to the back by means of screen printing, transparent or exchangeable thanks to the use of insertable labels.

With punched out sections, drilled holes, milled pockets, fa-stening by means of studs or sockets, press-fitted or welded.

With such a huge range of production processes at our dis-posal, we can meet your every requirement and offer a vast array of options for creating bespoke solutions.

Technical dataContact material

Switching elementMin. operating force

Max. operating forceSwitching voltageSwitching currentSwitching capacityContact resistanceInsulation resistanceDielectric strength

Electrostatic dielectric strengthEnduranceBounce timeOperating temperatureStorage temperatureAir humidityDegree of protectionMinimum bending radius of connecting leadOptions

Membrane keypads

Our membrane keypads ensure problem-free operation.

Silver conductive paste applied using the screen printing technique, gra-phite printed onto contact surfacesSnap disc (metal dome)3 to 5 N (other values possible, if front foil is embossed or if inserts are going to be used over the keys.)50 NMin. 100 mV AC/DC, max. 25 V AC/42 V DCMax. 100 mAMax. 0.6 WDepends on the length of the printed conductorBetween adjacent conductors and across open contacts > 106 ΩBetween any terminals and across open contacts U = 300 VBetween all other interconnected terminals and a metal support plate U = 500 VUstat > 10 kV> 106 operating cycles< 3 ms-20°C to +55°C-30°C to +70°C65% at +60°C indoorsIP 65 (from the front) on request1.5 mmVarious SMD components, SMD LEDs and resistors available on request

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



GmbH

Index Change Date Name

DateNameDraw.

Chkd.

Order

Specification:

Drawing No.:

Scale: Page 1

Clincher

8

98wxyz

0

tuv

mno6

3def

jkl5

2abc

7

ESC

pqrs

ghi4

1*

S4S3S2S1

2

3

4

5

6

9

10

17

1 Front foil

2 Front spacer

3

4 Metal dome positioning foil

5

6

8

Metal dome holding foil

Contact foil

Base adhesive

7 Glass panel

Snap discs

9 Seal

10 Front panel

Membrane keypad structure

Cross section

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



These keypads are ideal for bespoke and complex ope-rating systems, as they are extremely flexible in terms of their structure and offer all kinds of possibilities.

Application areas for PCB keypads• Mechanical and apparatus engineering• Information terminals, both inside and outside• Control engineering• Metrology• Many areas of medical engineering• Communications technology

Adding electronic components, such as keypad control-lers, to the PCB is a smart move,as this can reduce the construction height of the overall system.

Technical data (PCB keypad)Switching elementMin. operating force

Max. operating forceSwitching voltageSwitching currentSwitching capacityInsulation resistanceDielectric strength

Electrostatic dielectric strengthEnduranceBounce timeOperating temperatureStorage temperatureAir humidityDegree of protection

PCB keypads

PCB keypads for any requirements.

Snap disc (metal dome)3 to 5 N (other values possible, if front foil is embossed or if inserts are going to be used over the keys.)50 NMin. 100 mV AC/DC, max. 25 V AC/42 V DCMax. 100 mAMax. 0.6 WBetween adjacent conductors and across open contacts > 108 ΩBetween any terminals and across open contacts U = 300 VBetween all other interconnected terminals and a metal support plate U = 500 VUstat > 10 kV> 106 operating cycles< 3 ms-20°C to +55°C-30°C to +70°C65% at +60°C indoorsIP 65 (from the front) on request

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



1

Error

Warning

Offline

Online

PrintTest

Online Offline

PaperRun Paper

Length

Ok CancelHeadsClean

QuickHome?

5

6

7

8

2

4

3

1 PCB already populated with LEDs

2 LEDs attached to rear of PCB

3 Display attached to rear of PCB

4

5

6 Holding foil for the metal domes

7 Front spacer

8 Front foil

Snap discs

Positioning on PCB

PCB keypad structure

Cross section

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Compared with snap discs, short-stroke keys pro-vide a much higher level of tactile feedback when you press the key. Able to withstand more than 3 million operations, they offer unrivalled endu-rance.

Short-stroke keypad

Technical data (short-stroke keypad)Front panelFilmEmbossingKeypad decoder

KeysTravelOperating forceDistance between keys (spacing)Switching voltageSwitching currentSwitching resistanceEnduranceKey surfaceOverall heightIlluminationOperating temperatureStorage temperatureAir humidity

Choice of materialsInserted/matched to carrier plateWith/withoutWithout/optional

0.3 mm ± 0.05 mmApprox. 2 - 4 N (depending on type of key)At least 12 mm12 V50 mAMax. 100 m Ω> 3,000,000 operating cycles> 10 x 10 mm4/8/15 mmSurface illumination or spot illumination-20°C to +70°C-30°C to +80°C65% at +60°C indoors

Cross section

Short-stroke keypads

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Another alternative that we can produce for you is the key-pad with “doming elements”. The term “doming” describes a type of finishing process, whereby non-yellowing, transpa-rent liquid resin is applied to a surface. Doming produces a 3D effect and it is this that enhances the appearance of the keypad.

This type of finishing process improves the keypad‘s durabi-lity and makes it both waterproof and resistant to abrasion.

Doming keypads

Example of a doming keypad


Switching elementMin. operating forceMax. operating forceSwitching voltageSwitching currentSwitching capacityContact resistanceInsulation resistanceDielectric strength

Electrostatic dielectric strengthEnduranceBounce timeOperating temperatureStorage temperatureAir humidityDegree of protectionMinimum bending radius of connecting leadOptions

Silver conductive paste applied using the screen printing technique, gra-phite printed onto contact surfaces Snap disc (metal dome)3 to 5 N50 NMin. 100 mV AC/DC, max. 25 V AC/42 V DCMax. 100 mAMax. 0.6 WDepends on the length of the printed conductorBetween adjacent conductors and across open contacts > 106 ΩBetween any terminals and across open contacts U = 300 VBetween all other interconnected terminals and a metal support plate U = 500 VUstat > 10 kV> 106 operating cycles< 3 ms-20°C to +55°C-30°C to +70°C65% at +60°C indoorsIP 65 (from the front) on request1.5 mmVarious SMD components, SMD LEDs and resistors available on request

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Structure of a doming keypad

1

7

86

5

4

3

2

Structure of a doming keypad

1. Base adhesive2. Contact foil3. Positioning MD4. Holding foil5. Front spacer6. Front foil7. Snap discs8. Spacing circles

Keypad thickness: 1.4 mmDistance between keys: min. doming area plus 5 mmDoming height: min. 1 mm (depending on doming area)Doming area contour: Choice of any, no corners, smallest radius R 2 mm

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Illuminated keypads with LEDs

Seite 10


Switching elementMin. operating force

Max. operating forceSwitching voltageSwitching currentSwitching capacityContact resistanceInsulation resistanceDielectric strength

Electrostatic dielectric strengthEnduranceBounce timeOperating temperatureStorage temperatureAir humidityDegree of protectionMinimum bending radius of connecting leadOptionsLEDsCurrent consumption:Standard LED colour:Possible alternative LED colours:

Silver conductive paste applied using the screen printing technique, gra-phite printed onto contact surfacesSnap disc (metal dome)3 to 5 N (other values possible, if front foil is embossed or if inserts are going to be used over the keys.)50 NMin. 100 mV AC/DC, max. 25 V AC/42 V DCMax. 100 mAMax. 0.6 WDepends on the length of the printed conductorBetween adjacent conductors and across open contacts > 106 ΩBetween any terminals and across open contacts U = 300 VBetween all other interconnected terminals and a metal support plate U = 500 VUstat > 10 kV> 106 operating cycles< 3 ms-20°C to +55°C-30°C to +70°C65% at +60°C indoorsIP 65 (from the front) on request1.5 mmVarious SMD components and resistors available on request

Depends on the number of illuminated keysWhiteBlue/yellow/green/orange/red

Our illuminated keypads are ideal for certain ap-plication areas. The key feature of these keypads is that the individual keys are completely lit. A di-stinction is made between the two different types of technology involved: LED technology and electrolu-minescent technology.With LED technology, the luminous intensity remains constant, whereas in the case of electroluminescent film it is subject to a half-life period (see diagram on subsequent pages).The same design options are available as for the “standard keypads” (e.g. with embossing, etc.). The keypads can be equipped with additional LEDs as an option.

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50


www.kohlstaedt.de

Example of an illuminated keypad

FB-VK-016_1_13-09

Illuminated keypads with EL film

EL film function test

Electroluminescent materials are flat, flexible illumi-nants. As with a capacitor, there is a layer of phos-phorus particles between two electrodes. When an AC voltage is applied to the electrodes an elec-trical field is generated over the phosphorus and this causes it to emit light. These illuminants can be operated at voltages of between 40 V and 240 V and frequencies of between 50 Hz and 10 kHz.

Advantages of electroluminescent materials

• Very flat (approx. 0.2 mm, can be integrated into membrane keypads)

• Flexible (you can bend it)

• Low current consumption (at 110 V/400 Hz, approx. 0.15 mA without inverter)

• Low heat emission (approx. 1°C above ambient temperature)

• Extremely robust and highly resistant to vibrations and shocks

• Soft monochrome light (backlighting of displays)

Fields of application

• Backlighting of membrane keypads and LCDs

• Instrument lighting

• Emergency or night lamps

• Illuminated panels, flashing lights as a sales promotion tool

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50



Technical dataVoltageFrequencyLuminanceHalf-life periodCpassiveCactiveOperating temperatureStorage temperatureColoursInverter

40 - 240 V AC50 - 10,000 Hz70 cd/m², 115 V, 400 Hz5000 h, 155 V, 400 Hz0.25 nF/cm²0.39 nF/cm², 100 V, 400 Hz-20°C to +70°C-30°C to +80°CWhite, greenish blue, yellowish greenOn request

Halbwertzeit - Raumtemperatur

0

10

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30

40

50

60

70

80

90

100

0 400 800 1200 1600 2000 2400 2800 3200Zeit (Stunden)

Rela

tive

Hel

ligke

it (%

)

Beschleunigte Halbwertzeit - 60C/90%

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10

20

30

40

50

60

70

80

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0 50 100 150 200 250 300 350

Zeit (Stunden)

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)

Kohlstädt GmbH

[email protected]



phone: +49 (0) 5733 972 0

fax: +49 (0) 5733 972 50


www.kohlstaedt.de

Half-life period at room temperature

Accelerated half-life period at 60°C/90%

Time (hours)

Time (hours)

Rela

tive

brig

htne

ss (%

)Re

lativ

e br

ight

ness

(%)

FB-VK-016_1_13-09

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