The **FRT-3E-R** is a specific model of a **Miniature Rotary Damper** manufactured by **Fuji Latex**. These components are widely used in consumer electronics, automotive interiors, and household appliances to provide smooth, controlled mechanical motion. --- ### 1. Technical Specifications The "FRT-3E-R" designation follows a specific nomenclature regarding its torque and rotation direction. | Feature | Specification | | :--- | :--- | | **Part Series** | FRT-3 (Miniature Series) | | **Torque Rating** | Approx. 3.0 ± 0.8 N·cm (at 20 RPM, 23°C) | | **Rotation Direction** | Clockwise (R) | | **Operating Angle** | 360° Continuous rotation | | **Material** | Polyacetal (Body), Silicone Oil (Damping fluid) | | **Weight** | Approximately 0.7g | --- ### 2. Internal Mechanism & Electronics Context While the FRT-3E-R is a **mechanical** component, it is essential for the longevity and tactile feel of **electronic devices**. * **Viscous Resistance:** It operates on the principle of fluid friction. A rotor moves inside a housing filled with high-viscosity silicone oil. * **Shear Stress:** As the gear turns, the oil resists the motion, converting kinetic energy into heat (thermal energy), which results in a slow, "premium" opening/closing effect. * **Protection of Electronics:** By slowing down mechanical impacts, it protects internal PCBs (Printed Circuit Boards) and delicate connectors from the shock of snapping parts. --- ### 3. Common Applications In the context of electronic hardware, you will find this part in: 1. **Consumer Electronics:** CD/DVD/Blu-ray tray doors, pop-up camera mechanisms, or battery compartment lids. 2. **Computing:** Retractable cable management systems or laptop lid hinges. 3. **Automotive Electronics:** Center console lids, glove boxes, and retractable infotainment screens. --- ### 4. Installation and Gear Details The "3E" variant usually features a specific gear profile: * **Module:** 0.6 to 0.8 (standard gear pitch). * **Pressure Angle:** Typically 20°. * **Mounting:** It is usually press-fitted or snapped into a plastic housing via its mounting tabs. ---