Application of precision motion control platform in LDI direct writing exposure machine

As electronic products evolve toward miniaturization and higher density, LDI (Low Density Detection) exposure machines, core equipment for PCB and semiconductor manufacturing, require precision motion control technology to improve their accuracy and efficiency. Leveraging its innovative motion control technologies, TOKK has launched a variety of high-performance platform solutions, helping the industry overcome technical bottlenecks. This article, drawing on practical application cases of TOKK products, explains how precision motion control platforms are driving LDI equipment toward higher precision and efficiency.

Single worktable motion platform: optimized structure and precision control

TOKK streamlines the traditional dual-stage design and utilizes a three-axis drive module (Z/X/Y) combined with hydrostatic air bearing guide technology to achieve nanometer-level motion precision:

1. Z-axis drive: A wedge block is linked to a lead screw motor, achieving a vertical lift accuracy of ±0.5μm.

2. X/Y-axis hydrostatic air bearing guides: Air film lubrication reduces friction, resulting in speed fluctuations of less than one thousandth, making it suitable for the production of high-end IC substrates with line widths under 15μm. Furthermore, the platform integrates a visual calibration system with a fixed exposure engine, significantly reducing calibration and exposure switching time and improving yield by over 15%.

Linear motors and marble bases: Upgrading dynamic stability

TOKK utilizes coreless linear motors (KYAC4000 series) and Renishaw optical encoders, combined with a low thermal expansion coefficient marble base, to achieve high-speed, low-vibration control:
1. Linear motor direct drive

Eliminates the return error associated with belt or gear drives, keeping speed fluctuation to within 0.1%;

2. The marble base

Strong deformation resistance ensures long-term, stable operation in constant-temperature workshops.

This solution has been applied to high-precision applications such as flexible printed circuit boards, increasing production efficiency by 20%.

Multi-axis linkage and closed-loop feedback: Dynamic matching of expansion and contraction modes

In LDI expansion/contraction mode, TOKK achieves precise control through a multi-axis linkage control system and real-time feedback algorithms:

1. Dynamic Scaling Compensation: Adjusts the worktable position and coordinates laser spot scaling to achieve pattern size matching accuracy of ±1μm.

2. Closed-Loop Control: Integrated ranging sensors and a visual calibration system monitor PCB position in real time to ensure precise exposure focus.

This technology has increased the yield of fine circuit boards (line width ≤10μm) from 85% to 95%.

Vacuum Motion Control: Optimizing Ink Curing

TOKK solves the gloss challenge of solder mask ink by combining a vacuum filtration device with a precision motion platform:

1. Vacuum environment operation reduces the impact of air resistance on positioning accuracy.

2. Sealed, light-transmitting design: Acrylic material ensures laser penetration and increases ink free radical utilization by 30%.

This solution fills a technological gap in China and has been successfully applied to high-end PCB solder mask production.

Material and structural innovation: high rigidity and lightweight design

To meet the demands of high-speed exposure, TOKK utilizes carbon fiber composite materials and an aluminum alloy honeycomb structure, combined with optimized algorithms:

1. Lightweight Design

Acceleration is increased to over 2g, meeting the high-frequency production requirements of 5G communication boards.

2. Optimized Thermal Stability

Thermal drift error is controlled within 0.3μm/°C.

Through structural optimization, material innovation, and intelligent algorithms, TOKK's precision motion control platform has become the core driving force behind breakthroughs in LDI exposure systems. As technologies like linear motors and air bearing guides mature, and as artificial intelligence and real-time feedback systems become more integrated, TOKK will continue to advance LDI equipment toward submicron precision and 10,000 wafers/hour production rates, providing solid technical support for emerging fields such as semiconductor packaging and Mini LEDs.