## Overview of the Omron E39-R3 The **E39-R3** is a small, high-performance **Retroreflective Reflector** specifically designed for use with photoelectric sensors. It is an essential passive electronic component used to bounce light beams back to a sensor’s receiver to detect the presence or absence of objects. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Standard Retroreflective Plate | | **Material** | Acrylic (surface) and ABS (base) | | **Shape** | Small Rectangular | | **Installation** | Adhesive backing or screw-mount | | **Reflective Surface** | Micro-prism structure | | **Compatibility** | MSR (Mirror Surface Rejection) compatible sensors | --- ### 2. Functional Principle The E39-R3 operates based on **Corner Cube Retroreflection**. Unlike a standard flat mirror that reflects light at an angle equal to the incident angle, the E39-R3 uses thousands of tiny prisms to reflect light **directly back to the source**, regardless of the entry angle (within certain tolerances). - **MSR Functionality:** It is designed to polarize light. When used with a polarized sensor, the sensor can distinguish between light reflected by the E39-R3 and light reflected by a shiny object (like a soda can), preventing false triggers. --- ### 3. Application Use Cases * **Conveyor Systems:** Detecting small items passing between the sensor and the reflector. * **Industrial Automation:** Counting parts or detecting the position of a robotic arm. * **Safety Barriers:** Creating a light curtain effect in restricted areas. --- ### 4. Dimensional and Mounting Data The E39-R3 is favored for its compact size compared to larger models like the E39-R1. ```json { "dimensions": { "length": "40mm", "width": "10mm", "thickness": "7.5mm" }, "mounting": "2 holes for M3 screws" } ``` ---