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FUJI ELECTRIC JOURNAL 2000 Vol.73-No.9
Fuji Electric's Analysis and Simulation Technology
Noboru Furusho, Shinichiro Matsuo
To expedite product development, design, and manufacturing
processes, the effective use of analytical instruments and simulation
techniques has become more important. In both technologies, Fuji
Electric has so far made its preparations to solve problems in product
development, manufacturing processes, and fault analyses. This
paper outlines our activities in analysis technology and these in simulation
technology.
Interface Analysis for Semiconductor Devices
Tomoyuki Kawashima
With advances in semiconductor device technology, material
structure and composition in a micro region in the semiconductor
interface have a great influence on the device characteristics as well
as product performances. This paper describes structure and composition
analysis technology with a nanometer-level spatial resolution
using a transmission electron microscope, indispensable evaluation
technology to the research, development, and quality control of semiconductor
devices, and superhigh-sensitivity analysis technology
using a secondary ion mass analyzer.
Characterizations of Hard Disk Surfaces
Hitoshi Orikasa, Akiyasu Kumagai
Characterization and analysis technology is indispensable to the
research and development of hard disks. This paper gives some
examples of characterization and analysis of hard disk surfaces. (1)
Our original observation technique with a high spatial resolution of
liquid lubricant distribution on the surface (2) Measuring technique
of carbon protective layer thickness (3) Quantitative evaluation technique
for micro-corrosion resistance (using acid solution) in terms of
the thickness and materials of carbon protective layers (4) Depth profile
analysis of alkaline metal components in a reinforced glass substrate.
Analysis Technology of Water Environment Pollution
Tokio Ohto, Yoshiharu Tanaka, Nobuyuki Motoyama
Recently, we have had fear of water environment pollution such
as environmental endocrine disruptors (environmental hormone),
dioxin, pathogenic protozoa and O-157. Fuji Electric has tackled the
treatment technology of these harmful substances, and also has
achieved the latest technical development in the monitoring and
analysis technology. This paper describes the detection and analysis
technology for environmental hormone and toxicants in extremely
small quantities through instrumental analysis and bioassay, and
our original method for quantitatively determining pathogenic organisms
such as Cryptosporid-ium and Escherichia coli.
Evaluation Technology of Lead-Free Solders
Mitsuo Yamashita, Kunio Shiokawa, Atsushi Ueda
Solders mainly composed of tin and lead are currently in wide-spread
use in semiconductor devices. However, in view of lead influences
on the human body and environmental problems, lead-free solders
have been in urgent demand. In this study, aiming to improve
the solderability and reliability of a tin-silver solder, one of most
promising lead-free solder materials, we have investigated elements
to be added. Focusing on typical lead-free tin-silver solders and tin-lead
eutectic solders, this paper describes the result of investigations
into the mechanical properties solderability, micro structures of the
solder materials and gas analysis in soldering.
Materials Analysis by Synchrotron Radiation in the SPring - 8
Michio Ohsawa, Takayuki Hirose, Nobuhiro Okuda
In the SPring - 8, the largest synchrotron radiation facility in the
world, 13 industrial companies designed and constructed two beam
lines for materials research exclusively for the consortium use, and
the companies started studies on materials analysis in October 1999.
Recent results: the highly sensitive x-ray in-plane diffraction data
taken from the Co alloy thin-film magnetic recording media showed
the broadening of diffraction peaks due to stacking faults; XAFS (x-ray-
absorption fine-structure) measurement showed that the surface
of Pt fine particles used for a fuel cell electrode was oxidized; the X-ray
reflectivity measurement revealed that DLC (diamond-like carbon)
films prepared by different methods had different densities.
Analysis and Evaluation Technology for Geothermal Turbines
Yoshihiro Sakai, Mitsuo Yamashita, Masayoshi Sakata
As environmental problems become a matter of primary concern,
the importance of geothermal power generation for clean energy utilization
is getting more recognized worldwide. Since geothermal fluids
contain plenty of strongly corrosive impurities, it is very important
in designing geothermal turbines to take into consideration the
corrosion problems, among others, stress corrosion cracking and corrosion
fatigue. This paper outlines stress analysis and evaluation
technology for geothermal turbines which are operated in severe, corrosive
environments.
Analysis and Evaluation Technology for Electromagnetic Interference
Hiroaki Hokazono, Koichi Ohara
The recent tendency of electronic appliances toward high speed,
low voltage, and high-density mounting has caused an increase in
electromagnetic interference (EMI) and reduction in noise immunity.
There may be the fear of an indirect influence on the human body
such as pacemaker malfunction due to electromagnetic waves from
portable telephones, against which preventive technology is hoped
for. Former countermeasures often depend on experiences and are
seldom digitized. Fuji Electric, taking EMI simulation technology as
one of electromagnetic compatibility (EMC) technologies, is verifying
its effectiveness verification and applying it to the phases of development
and design.
A Simulation Technology of Cash Handling
Takeaki Yamamoto, Tetsuji Kawasaki
Aiming at optimum designing of a cash handling mechanism,
Fuji Electric established a simulation technology for coin and bill
behavior in the mechanism. To quantitatively analyze coin behavior
such as rolling and bouncing, we developed a technique of calculating
contact force between a coin and the mechanism as a combination of
a spring, damping, and friction, and also a technique of modeling a
bill, very flexible, in a sheet of small rigid bodies connected by
springs. The simulations almost agreed with the results of experiments
in both cases of coins and bills, and it was confirmed that this
analytical technique was an effective means of quantitative behavior
prediction.
Computational Fluid Dynamics Technology for Coolant Pumps
Isao Sekiguchi, Shigeaki Ohta
Fuji Electric has long utilized flow analysis in developing diversified
products in various fields. In developing a new high-pressure
coolant pump, three-dimensional flow analysis was applied to a
model of the whole pump. The result proved that the characteristics
and efficiency of the pump well agreed with the actual measurements.
Further, we extracted items for improving characteristics
based on the result, and attained about 3% higher efficiency.
Simulation Technology for Production Processes
Masayoshi Sakata, Masaharu Furukawa, Shinichi Abe
With the rapid improvement of computer performance and the
diversification of analysis technique in recent years, simulation has
come into wide use in manufacturing and processing fields. The
practical use of simulation technology makes it possible not only to
optimize manufacturing conditions in production but also to evaluate
damages to products in the manufacturing process as well as quality
itself. In developing new products, simulation technology is more
important than design technology. This paper outlines simulation
technology for various production processes and analysis examples.
Simulation Technology for Magnetic Switches
Susumu Murata, Hideki Daijima, Kaori Sekine
Fuji Electric's magnetic switch production since the start of sale
in 1954 exceeded a total of 200 million units, and in 1999, medium
and large capacity magnetic switch NEO SC series were developed.
The following development, requiring higher reliability and more
advanced performance and functions, necessitated the optimum
design in product development. Therefore, we utilized simulation by
computer-aided engineering (CAE) in designing, making the most of
computers. This paper describes structural, magnetic field, and
mechanical motion analysis as examples of simulation technology
utilization.
Analysis Technology for Ultrasonic Transducers
Yujiro Kitaide, Hiroyuki Yoshimura
Fuji Electric has developed a technique of determining the resonance
frequency and displacement rate of an ultrasonic transducer
by the finite element method with a model symmetrical about the
axis and calculating sound pressure distribution using the wave
equation. The result of analysis proved that both the oscillation
characteristics and sound distribution of a transducer agreed with
the actual measurements, and the propriety of the analysis technique
was confirmed. We developed this technique and examined a method
of performing the phase control of ultrasonic transducers arranged in
two or more arrays and controlling the convergence of sound waves.
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