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音響計測用マイクロホン

From "hearing" to "seeing" sound with
~Microphones for acoustic measurement~

The new low-noise microphone MI-1282M10 has made it possible to measure very small sounds that could not be achieved with previous models. Therefore, we spoke directly with Ichikawa, who is in charge of the design of acoustic measurement microphones, and Nakano, who is responsible for manufacturing.

  • Right: Section Chief Nakano, Measurement Instrument Manufacturing Group, Manufacturing Block. Left: Engineer Ichikawa, Measurement Technology Lab, Technical Headquarters.
    Right: Manufacturing Block Measurement Instrument Manufacturing Group Assistant Manager Nakano
    Left: Technical Headquarters Measurement Technology Lab Engineer Ichikawa

What kind of product is a microphone?

Ichikawa

This product is a sensor that measures the loudness (pressure) and pitch (frequency) of sound by converting it into an electrical signal. It is often used in research and development, as well as in production lines for quality inspection of mass-produced items, such as for detecting abnormal sounds in the production line of transmission gears in the automotive industry. Additionally, it is used to measure whether the sound pressure emitted by aircraft during flight is below specified values. Our company provides several types of sensors that can measure different sound pressures and frequencies, tailored to various measurement applications. This sensor is also incorporated into the detection unit of sound level meters, playing an active role in various scenarios.

Have there been any good experiences or challenges you have faced while being in charge of design so far?

Ichikawa

When I first took on the development, I faced difficult technical challenges despite it being my first experience with sound, and it was a continuous struggle. However, by reviewing the technology from scratch and making various improvements, we were able to successfully commercialize the product, and the hardships became a valuable experience.

The microphone requires a very broad range of necessary technologies, and it is essential to combine various knowledge along with sound-related knowledge for the design, so I feel that this sensor has also contributed to my skill development.

How is the manufacturing going?

Nakano

This sensor has finely detailed and very delicate components, and if there is even a slight scratch on the part that picks up sound, it cannot be considered a product. Additionally, the precision can vary depending on the adjustments made during assembly, making the manufacturing process very strict. Therefore, it is challenging to create a system that ensures consistency in precision across different manufacturers and to work with careful attention to the finer details. On the other hand, there is a sense of achievement when a product is completed to the required precision.

  • microphone for acoustic measurement
    microphone for acoustic measurement

New products were announced in 2024, but could you please tell me about the future prospects?

Ichikawa

In recent years, the demand for noise control has become stricter due to product noise reduction, and the measurement areas and performance required of microphones have also expanded. Therefore, we announced the low-noise microphone MI-1282M10 in April. It enables the measurement of very low sounds in the 10dB range, which was not possible with previous models, and we expect it to contribute to solving new sound-related issues. Moving forward, we aim to pursue further research and development with the goal of making the "invisible visible."

Nakano

In the manufacturing site, we are working daily to shorten lead times. Additionally, we are advancing the automation of certain processes through the introduction of new technologies such as collaborative robots. Moving forward, we aim to continue our efforts towards further improvements and enhancements to consistently provide high-quality products quickly.