KERN OIV 656 video microscope, autofocus, CMOS sensor, HDMI

Optoelectronic Transformation and CMOS Sensor Dynamics

In industrial semiconductor inspection, metallurgical fractography and microelectronic quality assurance, distortion-free magnification of three-dimensional topographies is crucial. The KERN OIV 656 video microscope overcomes the physical limitations of conventional binocular optical paths through fully digitalised, optoelectronic image conversion. The spectrum of photons reflected from the sample surface is projected directly through the objective lens onto a high-resolution 2-megapixel CMOS sensor. This semiconductor converts the incident light energy into analogue voltage signals via the internal photoelectric effect, which are then immediately transformed into a digital high-definition image signal by an integrated A/D converter. This design eliminates physiological fatigue (asthenopia) caused by the use of fixed eyepieces and enables immediate, collaborative viewing of complex microstructures on the monitor.

Algorithmic autofocus and depth of field

Microscopic analysis of printed circuit boards or complex milled components normally requires constant manual adjustments of the Z-axis to accommodate changing topographical heights. The OIV 656 overcomes this workflow bottleneck with a highly complex, processor-controlled autofocus system. The internal digital signal processing (DSP) analyses the microscopic edge contrast of the image in real time. In the event of deviations, the microcontroller immediately adjusts the optical focal plane electromechanically. This dynamic contrast autofocus compensates for topographical height differences in the sample in fractions of a second and keeps the depth of field absolutely constant, which massively accelerates reproducible defect detection at extremely high throughput rates.

Geometric optics and axial illumination physics

The detection of micro-cracks, solder joint defects or surface anomalies is a direct function of the angle of incidence of light and photon scattering. The system is equipped with a continuously dimmable, circular LED ring light (3 watts). This emits a defined light spectrum and ensures axially symmetrical, shadow-free illumination of the sample geometry. Optical magnification is achieved via a precise, continuously variable zoom lens (magnification ratio 0.7x – 4.5x). The continuous axial displacement of the high-refractive-index lens elements changes the focal length without chromatic aberrations or spherical distortions affecting the edge resolution of the digital image.

Digital interfaces and metrology integration

For certified laboratories required to maintain comprehensive quality management documentation, the OIV 656 offers direct saving of raw digital data. The video microscope features a standalone SD card slot for the direct storage of high-resolution image and video material without the need for a connected computer. The uncompressed digital video stream is transmitted in parallel via HDMI to external reference monitors with zero latency, or can be sent via the USB interface to appropriate laboratory analysis computers for software-based, pixel-precise measurement (metrology).

Technical details

• Optical system for digital image conversion (video microscope)
• High-resolution optoelectronic 2-megapixel CMOS sensor
• Algorithmic autofocus system for dynamic focus tracking
• Optical zoom lens with continuously variable focal length
• Magnification range of the optical system: 0.7x to 4.5x
• Shadow-free coaxial 3-watt LED ring lighting (dimmable)
• Digital high-definition image transmission via HDMI interface
• USB interface for integration with PC-based metrology software
• Integrated SD card slot for standalone raw data storage
• Solid mechanical table stand for vibration-free imaging
• No need for dioptre adjustment as viewing is monitor-based

Contents of the package

• 1 x KERN OIV 656 video microscope with autofocus
• 1 x Integrated zoom lens (0.7x – 4.5x)
• 1 x LED ring light (3 watts)
• 1 x Sturdy table stand
• 1 x USB data cable
• 1 x HDMI cable for external monitor output
• 1 x SD memory card for data backup
• 1 x mains power adaptor
• 1 x Detailed user manual

Individual requirements & accessories

The OIV 656 is designed for direct visual analysis on a screen and does not have its own eyepieces. To display the high-resolution HDMI signal optimally, we recommend using a calibrated reference monitor. Should the supplied stand prove insufficient in terms of space for inspecting extremely large-format printed circuit boards or components (such as motor blocks), the microscope can be combined with heavy-duty articulated-arm or swivel stands from the KERN range of accessories. Please contact our specialist procurement service for assistance with the optical configuration and integration into your quality management system.