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Home > Mall Dynamic > Tactile Switch Depth Exploration: Linear To Tactile, How To Choose The Best Tactile Switch
The light touch switch is achieved by pressing an actuator on a metal convex, which can be in contact with an overmolded terminal in the plastic body. They are simple and efficient, yet versatile in their field of application. The tap switch is the smallest switch in the APEM product family, with a short travel and low current.
The advent of tactile switches dates back to the early 1980s, when they first appeared in the form of film or screen printed switches, mainly for keyboards and small keyboards. However, their initial lack of haptic feedback and subpar performance faced significant resistance from users. This spurred the need for improvements, leading to the introduction of switches with metal domes as part of their design in the late 1980s.
The introduction of metal domes significantly enhances haptic feedback, providing a unique feel to the user at startup. In addition, this design improvement results in a more reliable method of switch activation that extends service life and solves previous durability issues.As a testament to its progress, modern haptic switches are now ubiquitous as input devices in numerous commercial and consumer products. Their widespread use is a testament to the importance and value they bring to a wide range of electronic devices and interfaces.
When the user applies pressure to the touch switch, it turns on the circuit and generates an electric current. This action creates a "tactile" sensation, usually a distinct click or tactile bump, that confirms the switch's operation. Once the pressure is released, the current is interrupted, thus turning off the switch. In essence, a tactile switch is an instantaneous action device that provides perceptible feedback through touch, assuring the user that the switch has worked and the signal has been transmitted. In addition, certain touch switch models are designed to be "normally closed" switches, which means they turn off the current when pressed and restart it when released. CUI Devices also offers options for these "normally closed" tactile switches.
A typical tactile switch consists of only four main parts: a molded resin base (4), a contact dome (3), a plunger (2), and a cover (1). It is because of this simplicity, with very few moving parts, that tactile switches generally last longer than other mechanical switches.
The contact dome has an arch shape that fits the base, which houses the terminals and contacts for PCB mounting. When subjected to force, the dome undergoes deflection or shape reversal, which produces unique auditory and tactile clicking properties. The bend of the dome also Bridges two fixed contacts within the base, effectively completing the circuit. Once the force is removed, the dome reverts to its original shape, causing the circuit to break. Depending on the desired level of tactile and auditory feedback, the dome can be made of a variety of materials, including metal.
Located on top of the contact dome is the plunger. This is used to push and bend the dome, activating the switch. The plunger can be made of metal, rubber, or other materials, and can have flat or raised actuators. The materials used in the plunger and contact dome significantly affect tactile click sensation and sound.
The top of the plunger is the cover, which is responsible for protecting the internal mechanism of the switch. The choice of cover material may include metal or other materials, depending on the intended use of the switch and the level of protection required. Some covers may also contain ground terminals to mitigate the risk of electrostatic discharge.
Resting state: The tactile switch is at rest before pressure or touch is applied. The button or touch panel is in the spring's original position and the contact is open.
Apply pressure: When the user applies enough pressure or touches the touch switch, the button or touch panel is pressed, compressing the spring. This pressure is transmitted to the mechanical structure inside the touch switch.
Contact closure: Under the action of pressure, the mechanical structure will make the contact close and establish a circuit connection. This causes current to flow inside the touch switch, which triggers the electronic device or system connected to that switch.
Release pressure: When the user releases pressure or stops touching, the spring's rebound pushes the button or touch panel back to its original position.
Contact open: With the return of the button or touch panel, the mechanical structure causes the contact to open, disconnecting the circuit. This will cause the current to stop flowing and the electronic device or system connected to the touch switch will respond accordingly.
Haptic switches are popular because of their compact size, low height and long service life, making them ideal for a variety of consumer and industrial products. In addition, as technology advances, haptic switches are now finding their way into newer applications, such as wearables, which take advantage of their small size, light weight and durability. When products require low power, instantaneous action power control or data input, and tactile and auditory feedback are desirable features, tactile switches ultimately prove to be a wise choice. CUI Devices offers a comprehensive line of haptic switches with compact packages, varying actuator heights, and multiple configuration options to provide a universal solution for different design requirements.
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