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Introduction of factory for Sub-Miniature Lamps – Kagoshima factory

Oshino Lamps Ltd.

Kagoshima factory

Oshino Lamps Ltd. Kagoshima factory

Introduction of factory for Sub-Miniature Lamps – Kagoshima factory

Concept of Kagoshima factory

Kagoshima factory : The main factory for SML(Sub-Miniature Lamps)

● The main factory of SML(Sub-Miniature Lamps) business

Kagoshima factory takes on the manufacturing of SML used for aircrafts, automotives and NDIR sensors. Kagoshima has a warm climate through a year and there is an advantage of that cancelation of flight is small.

● Integrated production systems

Kagoshima factory has been producing and designing for SML which meet the needs of various customers. Because of in-house production of the main parts, filaments and glass bulbs, we can perform product design and make trial product quickly.
Therefore it is our factory’s strength that we can work on requests from customers speedily through integrated production systems.

Manufacture for main parts

● Design and manufacture for filament and glass bulb

Although there are a lot of types of SML used for various industrial fields, most types of filaments of glass bulbs are designed and manufactured at Kagoshima factory.


Filament observed by electron microscope

● Filaments

The filament is the core part determining SML's electrical specifications.
Oshino has a high skill making various filaments from more than 100 kinds of tungsten. This skill contributes to a high-quality SML.
Oshio can make the filament from tungsten with φ0.002mm in minimum.

● Glass bulb


Various shapes of glass bulbs

Glass bulb has an influence on SML’s optical characteristics. Oshino Lamps Ltd manufactures glass bulbs with a variety of thickness and shape according to the kind of SML.
The smallest glass bulb we can produce is φ1.5mm.

Manufacturing process of SML(Sub-Miniature Lamps)

Case of Wire Terminal


● Welded stem

We weld dumet wire and glass bead together to make stem.


● Connecting filament

Mounting filament on the top of dumet wire and adjusting its overall shape.


● Inserting glass bulb - exhaust

Inserting the stem with connected filament into glass bulb and being a vacuum by exhaust machine.


● Sealing

Lastly we weld stem and glass bulb by burner. Then it completes wire terminal lamp.

Inspection & Analysis


● Inspection for electrical characteristic

Inspecting electrical characteristic (Current and Luminous flux) by lighting inspection machine which is developed in-house.


● Appearance inspection

With a reliable inspection skill which has been developed through Oshino’s SML manufacturing history, the inspector does inspection.


● Analysis system

Kagoshima factory has an analyzing system for SML.


● Experiment equipment

Kagoshima factory has equipments to evaluate the performance required for SML.

Oshino Lamps Ltd. has owned factories, sales distributions and development facility in global scale so this enables us to meet customer needs finely.
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