## Overview of the E39-R1K The **E39-R1K** is a high-performance **Retroreflective Tape** (reflector) manufactured by **Omron**. It is specifically designed for use with photoelectric sensors that operate using the retroreflective sensing method. Unlike rigid plastic reflectors, the E39-R1K is flexible and adhesive-backed. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Adhesive Retroreflective Tape | | **Reflective Material** | Micro-prism structure | | **Operating Temperature** | -25°C to +55°C | | **Storage Temperature** | -40°C to +70°C | | **Ambient Humidity** | 35% to 85% RH | | **Dimensions** | Approx. 22.8 mm x 17.8 mm (standard piece size) | | **Directional Properties** | High reflectivity at narrow angles | --- ### Key Electronic & Optical Characteristics #### 1. Micro-Prism Technology The "electronic" functionality of this part lies in its optical physics. It utilizes a **corner-cube micro-prism** array. When the light beam from a photoelectric sensor hits the tape, the prisms reflect the light back along the same path to the sensor's receiver, regardless of the incident angle (within certain limits). #### 2. Sensing Distance Factors The E39-R1K is often used as a substitute for rigid reflectors (like the E39-R1). However, it has a different **Reflector Factor**: * **Coefficient:** Typically provides about 70% to 90% of the sensing distance compared to a standard rigid reflector. * **Polarization:** It is compatible with sensors featuring **MSR (Mirror Surface Rejection)**, which allows the sensor to distinguish between light reflected by the tape and light reflected by a shiny object (like a soda can). #### 3. Application Use Cases * **Curved Surfaces:** Because it is a tape, it can be applied to cylinders or irregular machine parts where a plastic screw-on reflector won't fit. * **Space-Constrained Areas:** Its thin profile (less than 1mm) makes it ideal for tight mechanical tolerances. * **Conveyor Systems:** Used to detect the presence or absence of objects on a line. --- ### Installation Considerations 1. **Surface Preparation:** The mounting surface must be cleaned with alcohol or a degreaser to ensure the adhesive bonds correctly. 2. **Orientation:** For maximum range, the tape should be placed perpendicular to the sensor's light beam. 3. **Replacement:** Over time, dust or scratches on the tape surface will reduce the "Reflector Factor," requiring the sensor's threshold to be readjusted or the tape to be replaced.