Roof prisms change path direction through two roof-forming reflecting faces while maintaining optical-axis/image-direction consistency. Faces meet at 90°, creating complex internal paths. Their perpendicular reflecting faces meet along a roof edge, generally centered on the path. Available specifications: side A, B=C (mm): A 13.00-50.00, B=C 10-30; clear aperture Ф (mm): 9-29; surface figure: wavelength/10 @632.8nm; bevel: <0.25mmX45°; materials: optical glass, calcium fluoride, zinc selenide, silica, etc.; coatings: AR, HR, bandpass, beamsplitting, etc. Only selected sizes are shown; contact us for others. Custom sizes/coatings are supported. Material | properties | applications. Optical glass such as BK7/K9 | high index/stable optics | telescopes such as Porro binoculars, microscope objectives. Optical glass BK7/K9 | easy processing/moderate cost | laser path-folding prisms. Optical glass BK7/K9 | coatings such as aluminum/silver optimize transmission | lighting reflectors such as headlights. Silica JGS1 | high UV-visible-NIR transmission, 180nm-2.5μm | UV spectrometers/lasers. Silica JGS1 | low expansion/heat resistance | hot-environment optics such as flame observation. Silica JGS1 | chemical stability | space optics. Calcium fluoride CaF₂ | high transmission in the source-described UV band 150nm-8μm | UV lasers/imaging. Calcium fluoride CaF₂ | low index/dispersion | lithography optics. Calcium fluoride CaF₂ | lower mechanical strength | UV spectroscopy. Zinc selenide ZnSe | mid-IR transmission 0.6μm-16μm | thermal imaging/IR laser communication. Zinc selenide ZnSe | high hardness/wear resistance | CO₂ lasers. Zinc selenide ZnSe | strong visible absorption | medical IR diagnostics.
| Parameter | Value |
| Product Specifications - Surface Figure | Wavelength/10 @ 632.8nm |
| Quartz Roof Prism - Dimensions A | 20.55 mm |
| Quartz Roof Prism - Dimensions B | 15.00 mm |
| Quartz Roof Prism - Dimensions C | 15.00 mm |
| Quartz Roof Prism - Clear Aperture | Ф14 |
| Quartz Roof Prism - Coating Specifications | Uncoated |
| Quartz Roof Prism - Material | Quartz (JGS1) |
| Quartz Roof Prism - Surface Quality | 60/40 |
| Quartz Roof Prism - Bevel | < 0.25mmX45° |
Telescopes: roof prisms erect images in very compact binoculars and high-end telescopes such as ROOF designs. Total internal reflection in the roof deflects beams 90° and reverses images while preserving handedness, keeping objective and eyepiece collinear to reduce size. Advantages: compact, simpler optics for carrying/installation, reduced system length, and portability. Disadvantages: greater light loss and dimmer images; extremely demanding assembly accuracy, difficult manufacture, and high cost. Microscopes: convert objective-formed real images into virtual images to increase magnification and viewing field. Special roof reflections fold paths and transform images without changing axis direction, yielding upright enlarged virtual images. Advantages: better observation and convenient operation. Disadvantages: demanding prism precision and optical performance increase cost. Lasers: reflect and focus beams to a high-energy point. Roof reflections precisely control propagation for steering/focusing. Advantages: precise control in limited space and higher integration. Disadvantages: stringent reflectance/angular accuracy and difficult manufacture/alignment. Machine vision: inspect conveyor objects while matching sensor-image orientation to actual objects. Roof prisms flip images left/right to maintain directional consistency for recognition. Advantages: path adjustment and image correction in complex settings improve stability and accuracy. Disadvantages: environmental demands, since temperature/humidity can affect optics. Optical instruments: correct image orientation in imaging systems needing 90° deflection. Roof reflections deflect paths 90° while keeping image orientation similar to the object, supporting accurate acquisition/processing. Advantages: compactness, integration, and stability. Disadvantages: complex manufacture/calibration and demanding overall design/manufacturing capability.
Roof Prisms Use Their Distinctive Roof Structure to Fold the Optical Path by 90° While Maintaining Image Orientation. Widely Used in Telescopes, Microscopes, Lasers and Other Optical Equipment to Greatly Reduce System Size.
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Tianjin Fushi Optical Technology Co., Ltd., established in 2012, integrates the development, production and sales of precision optical components, diffraction grating technology and high-precision processing of optical glass. Our products include diffraction gratings, optical lenses, prisms, mirrors, windows, cylindrical lenses, etc., widely used in scientific research, medical, industrial and other fields. With core capability in independent R&D of grating masters, we can quickly respond to market demands, providing high-quality and cost-effective optical solutions. Adhering to the philosophy of "technology as foundation, quality for the future", we are committed to becoming a globally trusted and respected optical enterprise.