PCB reference designators: preserve lettering beside reflective components
In the supplied ring-light comparison, the R1, R2 and R3 markings have stronger contrast in one capture. This is a lettering-visibility trial rather than a solder-joint inspection or an OCR success result.
A readable-looking mark needs a measured character-verification trial.
Real camera capture
- Proposed light housing (spec)Ø91 × 25.5 mm
- EvidenceReal application-lab captures
- Camera (proposed)2448 × 2048 monochrome
- Field (derived proposal)33.78 × 28.26 mm derived from printed 0.25x magnification
Explore it in 3D
Camera and available lens CAD are published models. Light envelopes and the station base/height use printed dimensions. Part shapes, brackets, holders, shielding and spacing are illustrative; they are not reconstructions of a source part or a complete mechanically validated assembly. Light paths explain the proposed arrangement and do not simulate optical performance. The proposed field is derived from the printed camera pixel dimensions and the stated lens magnification/working-distance pair, not measured from the source capture.
Lighting application-lab image sheet
What the camera saw
Cropped from the source test sheet; original test annotations are retained. Captures are not generated or enhanced. Drag a comparison slider, or open any image full size.
Source higher-contrast capture: Source higher-contrast lettering capture with R1/R2/R3 more distinct; original red box retained.
The challenge
Small printed board markings compete with texture and highlights from nearby components. A setting that avoids glare may still leave the letters weak.
How it was solved
The source appears on the newer diffuse-ring product page but does not name the exact compared units. White LS-SDL-0012 is a proposed current model, not a proven source SKU.
Both source frames are annotated WD 40 mm without a full definition of the camera/lens arrangement. The proposed lens instead uses its own printed 150 mm working-distance pair and shows a local marking region, not full-board coverage.
Why it works
- 1
Diffuse illumination can change the relative visibility of printed strokes and the reflective board background.
- 2
The image comparison supplies no character-size calibration, decoder output or measured reading rate. Nearby component appearance does not establish solder integrity.
Lighting application-lab image sheet
Evidence you can inspect
R1/R2/R3 are more distinguishable in one source capture than in the other.
Both source frames annotateWD40 mm; the source describes higher character contrast but does not identify the exact compared models or report an OCR score.
An application-lab lighting demonstration, not a customer deployment or a qualified production inspection. Proposed camera, lens, fixture and scene spacing require a fresh trial. Source observations do not establish a defect-size limit, accuracy guarantee or production false-call rate.
From image contrast to a production decision
What to validate on your part
- 01
Define the mark task
Separate checking a known reference designator from reading arbitrary variable data.
- 02
Include board variation
Test solder-mask finish, printing quality, component reflections and normal texture.
- 03
Validate the read
Measure correct reads, substitutions and no-reads at the required local sampling and fixture variation.
From the demo to your test bench
Parts in this setup
LightOur pick
LS-SDL-0012
Ring shadowless light, Ø91 mm (LS-SDL-0012)
Proposed white diffuse ring from the source product family;91 mm outer diameter, 41 mm opening and 25.5 mm height. Exact source unit is not specified.
$249.00
In proposed setup
CameraOur pick
MV-CS050-10GM(NPOE)
Hikrobot MV-CS050-10GM(NPOE) 5 MP GigE area scan camera, IMX264, Gen 2 basic version, Mono, Without PoE
Proposed 5 MP monochrome global-shutter camera, 2448 × 2048 pixels at 3.45 µm, C-mount. The source camera is unidentified. This NPOE model requires separate power and does not support PoE.Not available in the United States. Available for delivery to other countries.
$819.00
In proposed setup
LensOur pick
LS-FFL-1456
35mm, F2.8, 1.1", C-mount, Macro lens (59 mm (-0.7X) to 150 mm (-0.25X)) (LS-FFL-1456)
35 mm C-mount macro lens. Its printed 0.25x / 150 mm working-distance pair gives a derived 33.78 × 28.26 mm field on the proposed camera. Confirm focus, coverage and the actual part plane.
$339.00
In proposed setup
Camera test stationOur pick
LS-MNT-0097
Camera stand with XZ adjustment and glass tray, height 600 mm (LS-MNT-0097)
600 mm column, 600 × 450 mm breadboard, glass tray and two lighting holders. Proposed bench fixture; actual load, travel, clamps, mounting fasteners and light clearance must be confirmed.
$629.00
In proposed setup
"Tested" identifies the part named in the source. "Our pick" is a proposed alternative or supporting part. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.
The set-up
| Source camera | Not identified in the source sheet |
|---|---|
| Camera and lens | Proposed catalog components |
| Proposed field | 33.78 × 28.26 mm derived from printed 0.25x magnification |
| Lens-to-part in proposed scene | 150 mm; printed working-distance pair |
| Mounting (proposed) | LS-MNT-0097 · catalog test station with two lighting holders |
Mount the optics with intent
The station is an optical test bench, with its two lighting holders included in the catalog listing. The 3D column and base follow the published height and footprint. Carriages, clamps and part supports are schematic: confirm camera screw pattern, lens support, light fasteners, permissible load and actual travel before ordering.
Complete the electrical system
Select a controller against the exact light voltage, drive mode and power, then confirm camera data/power/I/O cables and a suitable PC. These are not silently added to the proposed optical kit.
Build this system
Start from this setup, adapt it to your part.
The configurator opens with this study's camera, lens, light and station picked. Swap any part, check fit and price, then buy or ask for a quote.
Camera and available lens CAD are published models. Light envelopes and the station base/height use printed dimensions. Part shapes, brackets, holders, shielding and spacing are illustrative; they are not reconstructions of a source part or a complete mechanically validated assembly. Light paths explain the proposed arrangement and do not simulate optical performance. The proposed field is derived from the printed camera pixel dimensions and the stated lens magnification/working-distance pair, not measured from the source capture.
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Make the next trial specific.
Tell us the part size, smallest defect or tolerance, available working distance, material and line speed. Include what a good part and a reject look like.
About this case study: the photos and camera images come from the application laboratory of the maker of the lighting and optics we sell, imaged on the parts shown; your results depend on your part, camera and set-up. This is an application-lab study, not a LumaSpec customer deployment. Source figures are reported results; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.