YW
Yoshiyuki Watanabe
Founding Principal · Semiconductor Advanced Materials
46 years in semiconductor advanced materials
Yoshiyuki founded the practice and leads its technical direction. His work centres on
the decision that sits underneath every other one — which material family, which
grade, and why — and on translating a process environment into a specification that
holds up commercially and technically.
He is typically the principal a client speaks to first, and he stays on the engagement
through to the recommendation.
Material family selection
Grade specification
Fused natural quartz
Synthetic fused silica
Supplier qualification
Technical due diligence
SY
Seiji Yamashita
Principal · Semiconductor Technology & Advanced Wafer Manufacturing
45 years in semiconductor technology
Seiji's discipline is advanced wafer manufacturing, and his role here is to keep every
quartz decision anchored to what it does to the wafer. Crystal growth, thermal
processing, contamination and the yield consequences of a material choice are his
territory.
On crucible, boat and process-tube work he is usually the principal who can say
whether a proposed change will show up in device data — and how long it will take to
appear.
Crystal growth & CZ process
Crucible performance
Thermal processing
Wafer contamination
Yield impact analysis
Process integration
HI
Hiroshi Ikeda
Principal · Chemical Engineering & Advanced Materials
45 years in chemical engineering
Hiroshi covers the chemistry of the material: the synthesis and fusion routes, purity
and hydroxyl control, the behaviour of trace metals at temperature, and the etching
and cleaning practice that determines a part's real service life.
Contamination investigations generally run through him — tracing an unwanted element
back through the fabrication route to where it actually entered.
Flame hydrolysis & synthesis routes
Purity & OH control
Contamination pathways
Etching & cleaning chemistry
Devitrification
Analytical methods
TK
Tomohiro Kamochi
Principal · Mechanical Engineering, Fab Development & Installation
45 years in mechanical engineering
Tomohiro takes projects from drawing to running line. Facility layout, process flow,
utilities, tool installation, commissioning and the production ramp that follows are
his responsibility.
His value is concentrated in the phase where plans meet reality: the interferences,
utility mismatches and access problems that only surface once equipment is actually
on the floor.
Facility & layout planning
Equipment installation
Utilities & infrastructure
Commissioning & start-up
Safety & compliance
Production ramp
JA
Jiro Ariji
Principal · Mechanical Engineering, Advanced Equipment
46 years in mechanical engineering
Jiro's focus is the machinery that makes the material — fusion furnaces, drawing
towers, glass lathes, CNC finishing and metrology. Specification, evaluation,
acceptance and the mechanical detail that separates equipment which holds tolerance
from equipment which merely claims to.
He also leads much of the operator and engineer training that follows an equipment or
technology-transfer project.
Fusion furnaces
Tube drawing equipment
Glass lathes & CNC finishing
Metrology
Acceptance testing
Operator training
Which principal you get depends on the problem.
A grade decision starts with Yoshiyuki. A yield excursion starts with Seiji. A
contamination trace starts with Hiroshi. An installation starts with Tomohiro. A
machine that will not hold tolerance starts with Jiro.
Most engagements end up involving two or three of them, because most quartz problems
turn out to sit between disciplines.
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