1Polyester Dome Tactile Switch
This kind of products provide switch users with keypad that has strong, uniform tactile feel and a choice of standard or high temperature performance at an affordable price. And the combination of in-house manufacturing and design means shorter lead times.
System Features and Benefits:
Dual Purpose- the dome helps the user identify the key location and provides tactile feedback.
Consistency- thanks to our in house designed and manufactured equipment, we can produce a consistent dome from keypad to keypad and order to order.
Withstands High Temperature- because we use a proprietary forming process developed in-house, the polyester is molecularly reshaped into the geometry of the dome, thus the memory of the plastic sheet is in the geometry of the dome.
Crisp Tactile Feel- due to the process and the dome geometries developed, we can ensure a firm snap throughout the specified life of the switch.
Reliability- tested beyond 1 million actuations.
Design Flexibility- We can custom design our dome to meet any of our customers requirements . And additional domes on a given part can be added with little or no increase to the piece price.
System Specifications:
Mechanical
Life Cycles: >2,000,000
Operating Force (see chart below)
Switch Thickness: .025 - .050 Typ.
Switch Travel: .025 - .037 Typ.
Environmental
STD TEMP DOME HIGH TEMP DOME
Storage -40C to 65C -40C to 85C
Operating -40C to 65C -40C to 70C
Electrical Characteristics (Switch Circuit)
Contact Resistance: varies proportionately with part size, typically 100 ohms or less. Resistance values are typical through the life of the switch.
Open Circuit Resistance: 5x106 ohms minimum.
Contact Rating: 30 DVC maximum,100mA maximum, 1 watt maximum
Contact Bounce: 10ms nominal, 20ms maximum at 2,000,000 activation cycles.
Notes:
The material used in each case is polyester. Polycarbonate is not recommended because of its limited life cyclability.
Data is based on the use of a printed texture on the faceplate surface. This adds about .001 to the thickness of the graphics layer. If no texture is used, you can expect a slight decrease to the nominal force.
Actuation force measurements for round domes are based on standard ASTM test methods. A flat tipped nylon actuator that is half the dome diameter is used to measure force.
For actuation forces on oval domes .600 in length and below, force is measured with a flat tipped nylon actuator that is half the dome width. For ovals greater that .600 length, force is measured with a .250'' diameter nylon tip.
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2Metal Dome Tactile switch
Using these domes offers the following advantages:
Switch constructions that eliminate the top layer of the membrane switch
Stable forces
Excellent tactile feel
Very long life cycles; in excess of one million actuations
Contact Domes Available
The 12.2 mm and 8.4 mm domes as illustrated below:
220g Force
280g Force
340g Force12.2 mm
220g Force
280g Force8.4 mm
Typical Switch Construction
Membrane Switches