Finger Spring Contact
Typically made of Beryllium Copper and Gold-plated on the surface. Beryllium copper offers excellent elasticity and conductivity, while gold plating prevents oxidation and ensures extremely low contact resistance.
1. Product Definition & Name
Common names: Finger Spring, Contact Spring, Beryllium Copper Spring, or Shielding Spring. Technical names: Finger Spring, Contact Spring, Beryllium Copper (BeCu) Finger Stock. Material: Typically manufactured from Beryllium Copper (BeCu) with a Gold-plated finish. BeCu provides superior elasticity and conductivity, while gold plating prevents oxidation and ensures extremely low contact resistance.
2. Position in the Vacuum Coating Machine
It is typically located inside the Sensor Head. When you place the quartz crystal into the sensor head, this finger spring surrounds the edge of the crystal or presses against the electrodes.
3. Core Functions
In the high-precision environment of vacuum coating, this small spring plays three critical roles: ① Electrical Connection (primary function) – The quartz crystal requires high-frequency electrical signals to vibrate. Since the crystal cannot be soldered with leads inside the vacuum chamber, this finger spring relies on its elasticity to press firmly against the crystal's electrode surface, establishing a stable electrical circuit. ② Mechanical Fixation – It acts like a clamp. Using its circumferential tension, it securely positions the quartz crystal within the sensor holder, preventing displacement during vacuum evacuation or process vibrations. ③ Heat Dissipation & Shielding – Heat Dissipation: The crystal's frequency drifts when heated. The finger spring increases the contact area between the crystal and the water-cooled sensor head, facilitating heat conduction. Electromagnetic Shielding: It reduces interference from stray electromagnetic signals on the weak frequency signal.