Disco dicing refers to the highly precise manufacturing process of cutting (or "dicing") rigid materials—such as silicon wafers, glass, ceramics, and optical substrates—using specialized precision processing equipment developed by DISCO Corporation. As a critical step in microfabrication, this process separates a single large substrate into individual dies or components, a procedure formally known as singulation.
Core Technologies and Methods
DISCO Corporation provides several different methodologies for dicing, tailored to the fragility, thickness, and material properties of the substrate.
Mechanical Blade Dicing
The most common approach utilizes a high-speed rotating abrasive blade.
- The Blade: The dicing blade is incredibly thin (often ranging from 0.01 mm to 0.5 mm in thickness) and is typically embedded with synthetic diamond grit.
- The Process: The blade rotates at extreme speeds (often between 30,000 and 60,000 RPM), grinding a precise groove or cutting completely through the substrate.
- Cooling and Cleaning: Deionized (DI) water is continuously sprayed on the cutting area to cool the blade, reduce thermal stress on the material, and wash away microscopic debris that could otherwise contaminate sensitive surfaces.
Laser Dicing
For materials that are too brittle for mechanical blades or require zero kerf width (the material lost to the blade's thickness), laser dicing is employed.
- Stealth Dicing (SD): A specialized, focused laser beam is directed into the interior of the substrate to create a localized "modified layer" without damaging the top or bottom surfaces. The substrate is then physically expanded on a specialized tape, causing it to cleave cleanly along the laser-modified lines.
- Laser Full Cut: A long-pulse laser is used to cut entirely through the substrate via melt ejection. This is highly effective for rapid singulation without the mechanical stress of a physical blade.
Ultrasonic Dicing
Specifically developed for notoriously difficult-to-cut materials, this method combines mechanical blade rotation with ultrasonic vibration. It reduces the mechanical load on the workpiece, making it highly effective for minimizing chipping on exceptionally hard or brittle materials.
Applications in Optical Component Manufacturing
While heavily associated with the semiconductor industry (like cutting silicon microchips), Disco dicing is a fundamental process in the fabrication of precision optical components.
- Optical Filters and Prisms: When manufacturing optical bandpass filters, mirrors, or prisms, large coated glass or fused quartz substrates must be diced into small, specific dimensions. Disco saws equipped with specialized resinoid or metal-bonded blades ensure extremely clean, precise cuts.
- Edge Quality and Optical Paths: Minimizing edge chipping is critical in optics, as physical defects at the edge of a die can cause unwanted light scattering, stray reflections, or interference within the optical path. High-precision dicing ensures the functional area of the filter or lens remains structurally pristine up to its absolute edge.
- Complex Substrates: Optical devices often utilize tough materials like sapphire, crystalline quartz, or specialized optical glass. The diverse spindle speeds and automated optical alignment systems on these saws allow for tight-tolerance singulation of these hard-to-process substrates.
Key Advantages
- High Precision: Equipment positioning accuracy and index steps can be controlled down to the sub-micron level, ensuring strict dimensional tolerances across hundreds or thousands of components.
- Versatility: Capable of handling a vast array of materials, from standard silicon to specialized optics, ceramics, and compound semiconductors (like SiC).
- Automation: Modern dicing saws feature non-contact setup (NCS), automatic pattern recognition for alignment, and auto-focusing, which drastically reduces human error and increases throughput.