Multi-Type PCB Inspection | Adaptive Optical Measurement Solutions for Diverse PCB Working Conditions

PCBs used in different electronic scenarios have huge differences in substrate material, thickness, hardness and light transmission, bringing diverse challenges to optical dimensional measurement. Traditional single-function measuring equipment cannot adapt to multi-type PCB inspection requirements. SIG video measuring machines adopt adjustable optical systems and intelligent parameter matching technology, covering accurate PCB measurement of rigid boards, flexible boards, metal-based boards and special high-frequency boards, meeting the inspection needs of various electronic manufacturing fields.

FR4 rigid PCB is the most mainstream circuit board in the industry, with a conventional thickness of 0.8mm to 2.0mm and good rigidity and flatness. The standard configuration of SIG video measuring machines fully meets the detection requirements of FR4 boards. The bottom transmitted light clearly identifies through-holes and slots, and the annular surface light accurately captures board edges and pad contours. The stable imaging system supports long-term batch automatic measurement, which is the most mature application scenario for PCB optical dimensional measurement. It is only necessary to clean milling burrs before inspection to avoid edge recognition interference.

Ultra-thin rigid PCBs with a thickness of 0.2mm to 0.5mm are prone to bending and warpage under slight pressure, making contact measurement unavailable. The non-contact detection mode of video measuring machines completely avoids workpiece deformation caused by extrusion. Equipped with an automatic focusing module, the equipment independently focuses on each detection point to solve blurry imaging caused by uneven warpage of ultra-thin boards, ensuring consistent measurement accuracy of all dimensional features.

FPC flexible circuit boards feature ultra-thin substrates and soft texture, widely used in consumer electronics such as mobile phones and displays. FPC inspection faces difficulties including easy curling, numerous blind holes and tiny micro-pads. During PCB measurement, professional fixtures are used to flatten FPC workpieces to eliminate warpage. Since blind holes cannot transmit light, high-precision annular surface light is adopted for all-round contour detection. Matched with automatic focusing technology, it effectively captures tiny feature dimensions of flexible boards and solves the detection pain points of soft circuit boards.

Aluminum-based PCBs for LED lighting and power equipment are completely opaque and have strong metal reflection. Transmitted light is invalid for aluminum-based board detection, and excessive surface light brightness will cause mirror reflection and cover contour edges. SIG video measuring machines adaptively adjust light source brightness and incidence angle to suppress metal reflection, stably identifying board outlines and hole features. Light handling operations effectively protect the glass workbench from collision damage.

Special high-frequency PCBs made of PTFE and other special materials have soft textures and semi-transparent characteristics, with irregular burrs after milling. The equipment supports independent debugging of optical parameters for special substrates, matching unique light transmission characteristics to ensure accurate edge recognition. The system can store multiple sets of measurement programs for different PCB materials, realizing one-click switching for multi-variety production and improving factory inspection efficiency.

In general, SIG video measuring machines realize adaptive optical dimensional measurement for all mainstream PCB types through flexible optical parameter debugging and program customization, providing universal and high-precision detection solutions for diversified PCB manufacturing enterprises.