SMK Corp developed a capacitive touch switch using a transparent film for home appliances and office equipment and started to accept orders.
The company formed transparent touch switches by printing organic conductive polymer on a PET (polyethylene terephthalate) film substrate. The thickness of the switch's sensor part is 75μm.
The new switch has a higher productivity than switches using transparent conductive films that require patterning such as ITO films, reducing production costs, SMK said. It also has a higher flexibility than ITO film-based switches.
The switch is equipped with a high-sensitivity detection chip. Therefore, even when a thick cover panel is attached to the switch, it is possible to smoothly operate the switch. An acrylic cover panel of up to 3mm thickness or a glass cover panel of up to 5mm thickness can be attached to the switch.
The switch can be operated with a finger. Its operating temperature ranges from -20 to +70°C. The maximum number of keys is 22.
The production capacity for the switch is 500,000 units per month (in the case of a 4-inch product). SMK will provide the switch either as a touch switch and a chip or as a touch switch and a substrate equipped with a chip.