Konica Minolta - pulse noise source identification

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The Company

Konica Minolta is a Japanese holding group and was formed by the integration of Konica Corporation and Minolta Co., Ltd. The group’s product portfolio includes business products and services and industrial products and services. Konica Minolta conducts its operations worldwide. Konica Minolta Business Technologies, Inc. provides equipment for offices and production printing markets around the world, such as digital multi-functional peripherals (MFPs) and printers. Konica Minolta holds a leading position in the European and U.S. markets for office MFPs. Furthermore, Konica Minolta has been selected as the main sponsor and provider of MFPs and printers to the UN climate change conference (COP15) in Copenhagen.

In order to improve and optimise our customers’ office environments, Konica Minolta is committed to increasing the performance of its products while, at the same time, minimising noise to the lowest possible level.

New Acoustic Test Laboratory

Konica Minolta’s new test laboratory, built in March 2008 and commissioned in July of the same year, is based at Konica Minolta’s Mizuho site, Toyokawa- Aichi. As part of the laboratory, a hemi-anechoic chamber was built especially to house a state-of-theart system where a maximum of 19 microphones can be held in position simultaneously in a multi-microphone traverse. The angle of the microphones at the end can be adjusted. By introducing a traverse which can be switched with high precision according to the target, the reproducibility of the microphone positioning has been improved dramatically, enabling more accurate measurements. This system – the first of its kind in the world – is used to carry out a variety of measurements for multi-functional peripherals (MFPs) and printers.

The turnkey system, including a third party, 3D positioning robot was supplied by Brüel &Kjær. The robot can be controlled from an operating position outside the hemi-anechoic chamber and controls the positioning and height of the microphones. A closed circuit TV is also used to monitor the chamber. As well as the robot, the measurement system also includes:

  • A 24-channel PULSE D-frame with Dyn-X modules
  • 20 Low-noise, Free-field TEDS Microphones Type 4955 (19 microphones are used at any one time and one is kept as a spare)
  • Sound Calibrator Type 4231

The background noise level in the chamber is only 5 dBA and the cut-off frequency is at 100 Hz.

The system was commissioned with three purposes in mind:

  • Conformance testing, adherence to standards and legislation
  • Target setting and comparison
  • Benchmark testing of competitor products

Mr. Tou Matsunaga, Assistant Manager at Konica Minolta Business Technologies Inc. explains why Brüel& Kjær was chosen as supplier. He says, “ISO 17025 [General requirements for the compeHEADQUARTERS: Brüel&Kjær Sound & Vibration Measurement A/S DK-2850 Nærum Denmark Telephone: +45 7741 2000 Fax: +45 4580 1405 http://www.bksv.com info@bksv.com BN 0665 – 11 2009-12 Rosendahls Bogtrykkeri BN 0665 – 11 2009-12 tence of testing and calibration laboratories] is a very high spec requirement. We chose Brüel & Kjær because they were able to supply a total solution. From past experience, we know that Brüel& Kjær’s office in Japan provides excellent support. What’s more, Brüel & Kjær has a global reputation for accuracy, quality and reliability”.

As a result of obtaining ISO/IEC 17025 accreditation from the US-based NIST, the facility is now qualified as a test laboratory competent to carry out the acoustic measurements required when applying for the German environmental protection label known as the Blue Angel Mark. This means that data measurements formerly made by an accredited test laboratory in Germany can now be carried out quickly in-house, considerably shortening the time taken to acquire Blue Angel Mark certificates and providing fast and reliable support for the EU and other markets.

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