JEOL

DA-1

Metrology & InspectionElectron microscopeIntroduced 1947JEOL DA-1 family

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The JEOL DA-1 is a prototype magnetic field-type electron microscope. The DA-1 was sold to Mitsubishi in 1947. The DA-1 was developed by the group that later founded JEOL.^[1]

JEOLDA-1

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Introduced

1947

Node / era

Electron microscope

What it is

The JEOL DA-1 is an electron microscope associated with JEOL’s early development of electron microscope technology.^[1]^[3]^[2]

How it works

General reference — not yet source-verified

An electron microscope forms images by using an electron beam and electromagnetic lensing rather than visible light.

A transmission electron microscope sends electrons through a specimen to reveal internal structure at very small scales.

Where it fits in the process flow

General reference — not yet source-verified

Electron microscopes in this class sit in metrology and inspection workflows where detailed imaging or structural observation is needed after sample preparation.

A transmission electron microscope is generally used for examination of thin specimens when internal features and fine structure matter more than surface-only inspection.

What can it run?

Process applications and technology nodes documented for this tool.

electron microscopy

What do the numbers mean?

Gas & chemistry1

Developer context: developed by an initial group that included Kenji Kazato and Kazuo Ito in Mobara, Chiba Prefecture, Japan^[1]

Configuration & options8

Type: prototype magnetic field–type electron microscope^[1]
Type: magnetic field-type electron microscope^[1]
Development status: prototype^[1]
Instrument type: magnetic field–type electron microscope^[1]
First commercialized: 1947^[1]
Historical note: described as the origin of developing the electron microscope by JEOL Ltd.^[2]
Historical recognition: registered in 2010 as an Important Historical Scientific and Technical Material (Future Technology Heritage)^[3]
Historical recognition: selected in 2012 for the Analysis and Scientific Instrument Heritage designation^[3]

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What does it need to run?

Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.

Developer contextdeveloped by an initial group that included Kenji Kazato and Kazuo Ito in Mobara, Chiba Prefecture, Japan^[1]

Where are the manuals?

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Not publicly documented

Field notes

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Frequently asked questions

Is this class intended to change the sample?General reference — not yet source-verified

No. Machines in this class are used to observe and measure rather than to modify the specimen.

Not publicly documented

The following facts about the DA-1 are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.

No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the DA-1 are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the DA-1 are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the DA-1 are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the DA-1 are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
No publicly documented compatible parts, consumables, or accessories for the DA-1 are on record.
Answerable by: an OEM parts catalog or a service engineer