The **E39-R6** is a high-performance **Corner Cube Retroreflector** manufactured by Omron. It is designed specifically for use with retro-reflective photoelectric sensors to bounce the light beam back to the sensor receiver. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Corner Cube Retroreflector | | **Shape** | Circular / Round | | **Size** | Φ39 mm (Diameter) | | **Mounting** | Central screw hole (M3) | | **Reflection Efficiency** | High (Prismatic structure) | | **Environmental Protection** | IP67 (Dust-tight and Water-resistant) | | **Material** | Acrylic (Surface) / ABS (Base) | --- ### 2. How it Works (Corner Cube Principle) Unlike a standard mirror, the E39-R6 uses **Corner Cube Prisms**. * **Geometric Design:** The back of the reflector consists of thousands of tiny three-sided pyramids. * **Light Return:** Light entering the prism hits three surfaces and is reflected back exactly **parallel** to the incoming beam, regardless of the angle of the reflector (within its specified range). * **Alignment:** This makes it much easier to align the sensor with the reflector compared to flat mirrors. --- ### 3. Usage with Photoelectric Sensors The E39-R6 is an "optical" electronic component that works as a pair with a sensor. The sensing distance depends on the sensor model it is paired with: * **Standard Distance:** Typically used for sensing ranges between **2m to 5m**. * **Polarized Light:** It is compatible with MSR (Mirror Surface Rejection) sensors. Because the prisms rotate the light's polarization, the sensor can distinguish between light reflected by the E39-R6 and light reflected by a shiny object (like a soda can). --- ### 4. Installation Considerations 1. **Mounting:** It features a single center hole for an M3 screw. Do not overtighten, as the acrylic can crack. 2. **Cleaning:** Dust or oil on the surface will significantly reduce the sensing range. Use a soft, damp cloth. 3. **Chemicals:** Avoid using thinners or harsh chemicals, as they will cloud the acrylic surface and render it useless.