The **U-BP3N-R** is an electronic component primarily associated with **Olympus (EVIDENT)** microscope systems. Specifically, it is a high-performance **Mirror Unit (Cube)** designed for reflected light fluorescence microscopy. --- ### 1. Technical Specifications The U-BP3N-R is a narrow-band blue excitation filter set. Below are its primary optical characteristics: | Parameter | Specification | | :--- | :--- | | **Excitation Filter** | BP460-490 (Bandpass 460nm to 490nm) | | **Dichroic Mirror** | DM500 (Crossover at 500nm) | | **Emission Filter** | BA510IF (Longpass starting at 510nm) | | **Application** | Blue excitation (FITC, GFP, Alexa Fluor 488) | | **Type** | Narrow-band Interference | --- ### 2. Key Electronic & Optical Components While the unit itself is passive (no integrated circuits), it functions as a critical interface for the electronic light sources and imaging sensors: * **Interference Filters:** These are manufactured using vacuum deposition of metallic and dielectric layers. They are designed to withstand high-intensity light from mercury vapor lamps or modern high-power LED light engines. * **Dichroic Mirror (DM):** A specialized electronic-grade beam splitter that reflects shorter wavelengths (excitation) and transmits longer wavelengths (emission) with high efficiency (>90%). * **Mechanical Housing:** The "R" in the part number often signifies a specific revision or frame style compatible with the U-DRE (Electronic Rotary Turret). --- ### 3. Functional Mechanism The electronic light source (LED or Arc Lamp) sends broad-spectrum light toward the cube. The following sequence occurs: 1. **Selective Filtering:** The BP460-490 filter allows only blue light to pass. 2. **Deflection:** The DM500 reflects this blue light down through the objective lens to the sample. 3. **Signal Capture:** The sample's fluorescent response (green) passes back through the DM and the BA510IF filter. 4. **Electronic Imaging:** This filtered light is then captured by a CMOS or sCMOS electronic camera sensor. --- ### 4. Comparison with Standard Units Compared to the standard "Wide-band" blue cubes, the **U-BP3N-R** offers: * **Reduced Autofluorescence:** The narrow excitation band reduces background noise. * **Better Contrast:** Ideally suited for samples with weak signals or when using multiple fluorophores that overlap in spectrum. ---