## E39-R2 Reflector: Technical Specifications and Electronics Context The **E39-R2** is a high-performance **retroreflective target** (reflector) manufactured by OMRON. While the part itself is passive (it does not contain batteries or integrated circuits), it is a critical "optical component" in an electronic sensing circuit, specifically designed for use with photoelectric sensors. --- ### 1. General Overview The E39-R2 is designed for **Retro-reflective sensors**. These sensors house both the light emitter and receiver in a single unit. The E39-R2 completes the circuit by bouncing the light beam back to the receiver. | Feature | Specification | | :--- | :--- | | **Material** | Acrylic (Surface), ABS (Backing) | | **Shape** | Square | | **Directional Properties** | High-performance (Micro-prism) | | **Mounting** | Two M3 screw holes | | **Dimensions** | 59.9 mm x 40.3 mm | --- ### 2. The "Optical Electronics" Logic The E39-R2 uses **Micro-prism technology** rather than simple glass beads. In electronic sensing terms, this provides: * **Polarization (P-Refinement):** Most modern photoelectric sensors use a polarizing filter. The E39-R2 is designed to rotate the light's polarization plane. This allows the sensor to distinguish between the reflector and a shiny metal object (which would otherwise cause a "false positive" signal). * **Beam Return Efficiency:** It ensures that the reflected beam is parallel to the incident beam, minimizing signal loss over long distances. --- ### 3. Sensing Performance The sensing distance depends on the specific OMRON sensor series (e.g., E3Z, E3FA) paired with the E39-R2. | Sensor Series | Typical Sensing Distance | | :--- | :--- | | **E3Z-R (Compact)** | 0.1 to 4 meters | | **E3FA-R (M18 Cylindrical)** | 0.1 to 4 meters | | **E3JM-R (Terminal Block)** | 0.1 to 5 meters | --- ### 4. Installation and Maintenance Tips * **Alignment:** Because it is a high-efficiency prism, the sensor beam must hit the reflector as close to 90 degrees as possible for maximum electronic signal stability. * **Environmental Protection:** The E39-R2 is generally IP67 rated (when used with appropriate sensors), meaning it is resistant to dust and water splashes. However, if the surface is covered in heavy oil or dust, the **Hysteresis** of the electronic circuit may fail, leading to "chatter" in the output signal. ---