Diameter 100 Collimated Light Source, Right-Angled

I. Why a right-angle collimated light source is needed Machine-vision engineers often face mechanical-space constraints. A conventional straight-output collimated source emits forward and must be placed directly behind the workpiece. Fixtures, drives, and frames can block the optical path, while limited vertical space can cause mechanical interference or require a much taller, larger, more expensive machine. A 100mm-diameter right-angle collimated source addresses this by using an internal optical prism to turn the path through 90 degrees. The source body can be placed horizontally, with the turned beam illuminating the workpiece vertically. It retains collimated-backlight performance while greatly reducing vertical installation height, its key distinction from straight-output sources. II. Optical operating principle A common concern is whether turning the beam reduces parallelism. The source integrates an LED unit, homogenizing components, and a right-angle reflecting prism. LED light is collimated and then redirected through 90 degrees by the prism. The output remains highly parallel, with divergence kept small. It is still a collimated backlight: light passes through the test workpiece toward the lens. With a telecentric lens, it produces sharp, clean silhouettes, reduces penumbra blur, and improves dimensional repeatability. The right angle changes propagation direction without directly losing the main advantages of collimated light. III. Suitable workpiece sizes for the 100mm-diameter specification The 100mm-diameter designation means an effective output-beam diameter of 100mm, a common medium-aperture industrial size. Normally, keep the workpiece's maximum dimensions within 80‑90mm, leaving a 10‑20mm margin so slight displacement does not move it outside the illuminated area. Suitable tasks include small and medium metal stampings, connector pins, thin plastic sheets, FPC ribbon cables, small-component contours, and hole or gap inspection. Workpieces larger than 90mm are not recommended for this size, because insufficient edge brightness and uneven illumination can impair imaging. IV. Suitable applications Not every backlight inspection needs a right-angle source. If there is sufficient space inside the equipment and the camera and lens can directly face the rear of the workpiece, a straight-output collimated source is simpler and more economical. Prefer the right-angle type when vertical space prevents placement directly behind the part, fixtures or mechanisms block the straight path, or collimated-backlight measurement is needed while simplifying the machine structure. For simple presence/absence inspection without precision contour measurement, a diffuse backlight is sufficient and avoids unnecessary cost. V. Practical setup with a telecentric lens In precision dimensional measurement, the 100mm-diameter right-angle source is usually paired with a telecentric lens for the best combined performance. Align the output center with the lens optical axis: offset produces unequal brightness and blurred or distorted edges. Follow the recommended working distance rather than substantially increasing or decreasing source-to-workpiece spacing, since deviations degrade collimation and edge definition. The source aperture must exceed the workpiece size so the entire part lies within the parallel beam. A dedicated adjustable-brightness controller is recommended. Set brightness for the material to avoid overexposure or insufficient illumination and ensure stable contour extraction. VI. Common on-site pitfalls This is backlighting, mainly for workpiece outlines, and is unsuitable for surface-scratch or surface-defect inspection. Do not confuse its uses with coaxial illumination. The internal prism is a precision optical component; do not disassemble the housing without authorization. Impact or scratches on its coatings cause stray light, bright or dark spots, and inspection errors. Provide vibration protection during installation: excessive production-line vibration shifts the optical path and reduces long-term imaging stability. Control ambient light, which can overlap the image and interfere with contour extraction. Where possible, use baffles to exclude external stray light. VII. Maintenance and service life LED illumination needs modest but regular maintenance. Internal lenses and prisms are vulnerable to dust and oil. Clean regularly in dusty workshops, using only gentle wiping with an optical cleanroom cloth; never scrape coatings with hard objects. During prolonged operation, ensure heat dissipation and avoid running at maximum brightness under overload. LEDs gradually lose output, so production equipment should have brightness checked regularly to prevent threshold drift and measurement errors. VIII. Advantages and limitations Turning the path through 90 degrees saves vertical space, retains collimated-backlight characteristics, and supports precision contour measurement of small and medium parts in compact vision equipment. Compared with a straight-output source, the prism structure is more complex and costly, alignment requirements are higher and setup takes longer, and large-field illumination uniformity is slightly poorer. Evaluate space first: use ordinary collimated illumination when space permits and consider the right-angle version when space is restricted. IX. Summary The 100mm-diameter right-angle collimated source is a targeted machine-vision backlight solution for precision contour inspection in cramped equipment. It redirects the path while retaining collimated-light performance and suits telecentric dimensional measurement. Match workpiece size and installation space, control optical-axis alignment and working distance, and maintain dust and vibration protection. It merits evaluation where fixtures obstruct the path or vertical space is limited but high-precision contour imaging is required.

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