Sanko Seikohjyo Co.,Ltd.
TEL: +81-3-3607-2328

The CTA telescope equipped with a large reflector manufactured by Sanko has been completed.

In October 2018, the first unit of the state-of-the-art telescope "Cherenkov Telescope Array (CTA)",
which was under construction in the Spanish Canary Islands in the North Atlantic Ocean, was completed.

This CTA project is an international project in which more
than 1,400 researchers from research institutes in 31
countries participate, and research institutes such as the
Institute for Cosmic Ray Research, University of Tokyo
also participate from Japan.
This telescope is used to observe weak light
(Cherenkov light)
generated by the reaction of high-energy gamma rays
(emitted from supernova explosions and the surroundings
of supermassive black holes)
with the Earth's atmosphere.

For that purpose, we arranged about 200 reflectors and
built a huge telescope with a diameter of about 23 m.
This is said to be the largest telescope in the world in operation as of 2018.
When the CTA is completed, the sensitivity of the observation device will improve dramatically.
As a result, it is expected that the mystery of black holes
and dark matter (dark matter) and the appearance of the
universe in the early stages of birth will be elucidated.
Under the guidance of Professor Masahiro Teshima
of the Institute for Cosmic Ray Research,
the University of Tokyo, we manufactured reflectors used
in telescopes.
The reflector has a hexagonal shape with an opposite
side of 1.5 m and has a very wide reflecting surface.
Although it looks almost flat in the photo, it is a spherical
concave mirror with a radius of curvature of 57 m.

It is possible to collect the reflected light of 80% or more
of the mirror surface to a range of 30 mm in diameter at a
distance of 57 m like the light collecting ability.

Moreover, this reflector is not polished.
As a result, we have succeeded in significantly reducing
manufacturing costs compared to conventional reflectors.

Since the CTA telescope is installed outdoors,
the reflective film on the surface of the reflector is also
required to be weather resistant.
The surface of the reflector made by Sanko Seikosho is
multi-coated with 5 layers by sputtering, and a strong
film is formed to achieve high weather resistance.
In recognition of these achievements,
we received a letter of appreciation from Takaaki Kajita,
director of the Institute for Cosmic Ray Research,
University of Tokyo
(winner of the 2015 Nobel Prize in Physics).
It is an honor for us to receive such a letter of appreciation
because our manufacturing technology has contributed
to the progress of science, and at the same time,
it has motivated us to further improve the technology.

We are grateful to everyone at the Institute for Cosmic
Ray Research, the University of Tokyo,
for giving us such an opportunity and for their patient guidance
until the product was completed.


    Sanko Seikohjyo Co.,Ltd.
Product Info Company Profile Equipment MAP Contact by e-mail

・Lage precision    mirrors
・Telescope related   products
・Golf products
・Scale products

・Document request
・Question before    purchase / Other
・Purchased product   support

Kanamachi Headquarters
TEL: +81-3-3607-2328
Business content:
・Scale products
・Golf related products

Ina branch
TEL: +81-297-20-7400
Business content:
・Glass condensing mirror
・Large precision reflector
・Thin film deposition work

c 2020 Sanko Seikohjyo Co.,Ltd.