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News Article

New MEMS Foundry Business

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ROHM has recently established a process for MEMS (Micro Electromechanical System) utilizing thin-film piezoelectric elements, and a foundry business that integrates product development and manufacturing processes, from wafer pulling to mounting, in order to meet a variety of customer needs.

ROHM have already begun conducting joint development of piezoelectric MEMS products based on customer requirements and gradually expanding production lines to accommodate growth markets, such as industrial inkjet printers, sensors, and wearable devices. Going forward ROHM will continue to integrate piezoelectric elements with MEMS technology in order to achieve greater miniaturization and energy savings.

 Market Trends

Piezoelectric elements, which possess the inherent property of generating a voltage when pressure is applied, are incorporated into a variety of electronic devices, from conventional inkjet printheads to autofocus systems in infrared and standard cameras.

Combining these elements with MEMS technology, which is commonly used in accelerometers and gyroscopes, makes it possible to simplify design and reduce the size of processing controllers, contributing to increased performance, lower costs, and greater end-product miniaturization. In addition, the energy-saving characteristics of the piezoelectric element itself, which requires very little power during standby, are garnering increased attention, particularly in the sensor market where explosive growth is expected.

Piezoelectric elements, which are expected to be adopted in applications requiring piezoelectric and pyroelectric characteristics, contribute to greater miniaturization, increased performance, and reduced energy consumption in sensors and actuators of all types.

  • Accelerometers, gyroscopes, pressure sensors
  • Infrared sensors and cameras
  • Microphones and speakers
  • Energy harvesting
  • Inkjet printheads
  • Autofocus circuits in cameras
  • Nozzle control

In the device creation of piezoelectric MEMS, thin-film deposition that possesses high piezoelectric properties and precision fabrication and molding of micro-piezoelectric elements are difficult to realize. Furthermore, high-precision processing is required for the MEMS drive block, and additional knowledge and expertise "“ along with the cultivation of new technologies "“ are needed in order to support next-generation applications and emerging markets.

In response to these challenges, ROHM is actively engaged in the research of thin-film piezoelectric elements. Based on the findings of Professor Isaku Kanno of the Graduate School of Engineering at Kobe University on evaluation measurement methods for thin-film piezoelectric elements, and by taking advantage of development synergy created by combining the collective production technologies of the entire ROHM Group, which includes ROHM's ferroelectric technology cultivated for long-term memory, LAPIS Semiconductor's high-sensitivity MEMS/mounting technology, and Kionix's MEMS miniaturization technology, ROHM were able to establish a manufacturing process at LAPIS Semiconductor Miyazaki and provide piezoelectric MEMS optimized for a variety of markets and applications. 

ROHM says their MEMS processes utilizing thin-film piezo elements offer 5 key advantages.

1. Integrated production system :A new, streamlined production system was established in Japan (LAPIS Semiconductor Miyazaki) that integrates a number of processes, from wafer pulling to mounting, enabling complete control of product manufacturing for unsurpassed quality and flexibility

2. Clean room : A 1500m2 clean room was built for specifically for IC microfabrication

3. 6-inch wafers :6-inch wafers are currently being used, with plans to transition to 8-inch wafers within 2 years

4. 24-hour operation : Round-the-clock operation speeds up development while enabling early production startup

5. Expanded production: The production capacity for sensor chips will be increased from approx. 600K/M to over 2000K/M to ensure stable supply

 

 

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