## Overview of the E39-R8 Reflector The **E39-R8** is a specialized optical accessory manufactured by **Omron**. It is a corner-cube retroreflector designed primarily for use with photoelectric sensors, specifically those operating on the **retro-reflective** principle. --- ### Technical Specifications The following table outlines the key physical and optical characteristics of the E39-R8: | Parameter | Specification | | :--- | :--- | | **Material** | PMMA (Acrylic) for the surface; ABS for the base | | **Shape** | Square / Rectangular | | **Directional Angle** | 30° minimum (at the sensing distance) | | **Standard Target** | Used for E3Z, E3JK, and E3JM sensor series | | **Operating Temperature** | -25°C to 55°C | | **Storage Temperature** | -40°C to 70°C | --- ### Key Electronic & Optical Functions 1. **Retro-reflectivity**: Unlike a standard mirror, the E39-R8 uses a "corner-cube" structure. This ensures that the light beam sent by the sensor is reflected back along the exact same parallel path to the receiver, even if the reflector is slightly tilted. 2. **Polarization Compatibility**: The E39-R8 is designed to work with **MSR (Mirror Surface Rejection)** sensors. It maintains the polarization state of the light, allowing the sensor to distinguish between the light reflected by the E39-R8 and light reflected by a shiny object (like a soda can), preventing false triggers. 3. **Sensing Distance Factor**: The efficiency of the E39-R8 acts as a multiplier for the sensor's range. While smaller reflectors (like the E39-R3) reduce the sensing range, the E39-R8 provides a standard high-reflectivity surface that allows sensors to reach their maximum rated distance. --- ### Installation Considerations * **Mounting**: It typically features a single mounting hole for M3 or M4 screws. * **Maintenance**: Because it is an optical component, dust or oil on the surface will significantly decrease the sensing range. Regular cleaning with a soft, dry cloth is recommended. * **Chemical Resistance**: Since it is made of PMMA/ABS, avoid using thinners or harsh detergents that could cloud the plastic and ruin the optical properties. ---