Developing Revolutionary New Products for the Coming Era
Crystal devices are the key components to today's electronic products,
and electric devices incorporate crystal production know-how
and wireless, high-frequency technology.
By developing both crystal and electronic to meet the needs of tomorrow,
we can contribute to the growth of the information/communications
and aviation/aerospace industries.
Company Name Tokyo Denpa Co., Ltd.
Type of Industry Manufacture and sale of Quartz Crystal Units,
Quartz Crystal Oscillators, Quartz Crystal Devices,
and Electronic Measuring Equipments.
Commencement 1934, May (Tokyo Denpa Laboratory)
Establishment 1949, May (Tokyo Denpa Co., Ltd.)
JPY1,655,600,000
Per presentative President, Hideo Kumagai
Crystal Products Div.
Electronics instruments Div.
5-6-11, Chuo Ota-ku, Tokyo 143-0024
TEL +81 (0)3-3751-6171
FAX +81 (0)3-3753-3977
Gunma Plant
430 Oza Hakoisi,Tamamura-cho,Sawa-gun,
Gunma Prefecture 370-1113
TEL +81 (0)270-65-5511
FAX +81 (0)270-65-7946
Kansai-Branch
3F,Shoto Bldg.,5-15,Togano-cho,Kita-ku,
Osaka-shi,Osaka,530-0056
TEL +81 (0)6-6312-3267
FAX +81 (0)6-6312-6259

(once a year)
Employee 210(Group total 913)
Banks The UFJ bank, Ltd.

Bank of Tokyo Mitsubishi
The Tohoku Bank, Ltd.
The Dai-ichi Kangyo Bank Ltd.
Hideo Kumagai
The Tokai Bank Ltd.
Maruman Finance Corp.
Central Capital Corp.
Chiyoda Life Ins.
the Defense Agency AT & T NEC corp.
the Marine Safety Agency Kyocera corp. Philips Japan Ltd.
the Ministry of Transport Kenwood corp. Nokia
the Ministry of Postal Services Chrysler corp. Hagenuk GmbH
the Ministry of Construction Sam sung Electronics Hitachi Ltd.
the Meteorological Agency Sanyo Electric Co., Ltd. Ford Motor Corp.
the Meteorological Observatory SPC Electronics corp. Fujitsu Ltd.
the National Police Agency Citizen Watch Co., Ltd. Matsushita Electric Co., Ltd.
the Ministry of Fire Service Sharp corp. Mitsubishi Electric Corp.
the Measurement Research Center Sega Enterprises, Ltd. Mitsumi Electric Co., Ltd.
I.B.M. corp. Sony corp. Murata MFG Co., Ltd.
Alps Electric Co., Ltd. Denki Kogyo Co., Ltd. Motorola,Inc.
ERICSSON. Toshiba corp. Unisia JECs corp.
LG Electronics corp. Thomson consumer Uniden corp.
Kitami Tokyo Denpa Co., Ltd. Kitami Plant
18-5,Hochi,Kitami-city,Hokkaido
Kitami Tokyo Denpa Co., Ltd. Bihoro Plant
315-1,Midori,Bihoro-chou,Abasiri-gun,Hokkaido
Kitami Tokyo Denpa Co., Ltd. Memanbetsu Plant
3-1-1, Nishi Nijyo,Memanbetu Machi,Abashiri-gun,Hokkaido
Morioka Tokyo Denpa Co., Ltd. Morioka Plant
1-15-10,Kami-iioka,Morioka-city,Iwate Prefecture
Morioka Tokyo Denpa Co., Ltd. Kuji Plant
28-38-35,Terasato,Kuji-city, Iwate Prefecture

1934
Commencement of business operations.
Production of quartz crystal units.

1940

 Production of radio communications equipment in a designated
plant of the naval technical research center.

1953

 Development of crystal impedance meter for
mass production of quartz crystal units.

1964

 Development and mass production of quartz crystal units for
color television sets in anticipation of consumer demand.

1968

 Planning of production of space communication equipment.

1977

 Independent production of synthetic quartz crystal in response to
the growing demand for quartz crystal units for transceivers.
Research on quartz crystal temperature sensor under the sponsorship
of the Ministry of International Trade and Industry.

1981

 Development of quartz crystal temperature and pressure
sensors and production of application equipment.

1987

 Mass production of temperature-controlled quartz crystal
oscillators for cordless and cellular telephones, and crystal
oscillators facsimile machines in response to the growing
popularity of telephones and facsimile machines.

1990

 Entrusted with the development of a wireless cryogenic
wide-range temperature control system for research on
super conductive material by New Technology Association.

1994

 Expansion of the Bihoro Plant at Kitami Tokyo Denpa for production
of miniature high-precision quartz crystal units in response to the
rapidly growing mobile communications market.

1995

 Establishment of Kuji Plant at Morioka Tokyo Denpa,
and mass production of temperature-controlled quartz
cry-stal units for PHS(Personal Handy phone System)
mobile telephones.

1996

 Development of Langasite, and production of Langasite
filters for compact, high-frequency brand mobile
communication devices.
Marketing & Development.
Products focusing our efforts on two top-level
technical fields to meet the advancing needs.
As mobile communication devices become smaller and more lightweight,
the crystal products inside require advanced technol-ogy to to become
smaller and capable of being surface mounted with a high level of
performance that can withstand extreme temperatures. Our expertise in
the areas of materials development and product application of quartz
crystal enables us to develop and manufacture products to satisfy our
customer's demands.
As a top-class synthetic quartz crystal manufacture.
Since beginning production of synthetic quartz crystal in 1977, we have continued to improve the quality and purity of our crystal. In 1994, we were first in the industry to develop a high-pressure furnance (platinum furnance) for production of synthetic quartz crystal with our own technology. As a result of this innovation, we were able to establish technology for mass production of high-quality synthetic quartz crystal with few crystal defects and technology for processing ultra-thin quartz plates for use in high-frequency crystal products. In the field of mobile communications, we are producing crystal materials to meet the demand for highly stable, high-precision crystal products that are smaller, thinner and cap-able of being surface mounted.

Synthetic Quartz
Crystal taken out
from Autoclaves
Synthetic Quartz
Crystal
Quartz Crystal Units

Developing added-value products for the needs of tomorrow.
Crystal devices are key components in a wide variety of electronic products.
We are making efforts to develop high added-value products for use in one such
sector of electronics, namely mobile communication devices, with successful results.
As these devices are becoming more compact with more enhanced features,
we are now manufacturing surface mounttype, subminiature quartz crystal units
and highly-stable crystal oscillators. And in 1995, we developed a new material,
Langasite, that features excellent piezoelectric and temperature characteristics and
operates on a high frequency band. We were able to successfully incorporate
this material in our latest products to meet the varying needs of tomorrow.
Production & Quality Control
An efficient, integrated production and quality control system
that provides higher quality products on a more timely basis.
In the quickly expanding information and communications markets,
the need for a stable supply of crystal products is increasing,
and the demand for higher quality is becoming more severe.
In response to these trends, we are improving our manufacturing facilities and
strengthening our integrated production and quality control system,
which handles everything from raw materials we are creating a system
to provide quality that is sure to satisfy.
Highly efficient production through scale merit of our plants.
Tokyo Denpa concentrates the efforts from its seven specialized plants to ensure
highly efficient production. To provide a stable supply of products, our production
lines are automated, new plants are constructed and our exiting plants are expanded
The Kuji Plant at Morioka Tokyo Denpa was constructed in 1995 for
increased production of crystal oscillators. And in 1996, the plant at the Gunma
head quarters underwent a mayor expansion, and a system was developed to handle
the increasing demands of the future.
Realization of higher reliability and lower costs.
We have constructed an integrated production and quality control system that covers each process from the manufacture of highly pure synthetic quartz crystal to its incorporation into various electronic products. this system enables cost and quality control starting the raw materials in order to create products with higher reliability and lower costs. And with ISO 9002 series certification, the plants at Tokyo Denpa continue to strive toward higher total quality backed by stronger quality control.
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