September 10, 2021
To whom it may concern,
Company: Tamagawa Holdings, Co., Ltd.
Representative: President, Toru Masuzawa(JASDAQ Code: 6838)
Contact: Management Planning Division, Kana Yamauchi
Tel: 03-6435-6933

Notice on Success of Production of Sales of Gas Cells of New Miniature Atomic Clocks-Emergence into the New Market from Ultra-high Precision Magnetic Sensor to Gyroscope SensorWe are pleased to inform that we have succeeded in verificationof the method to produce small-size gas cells which greatly control
performance of miniature atomic clocks at a low cost (patentpending) in the research and development which we had conductedjointly with Tohoku University.
We have also succeeded indemonstration of the principle of miniature atomic clocks which wasconducted as such demonstration experiment. Please be notedthat we will hereafter proceed with hearing of the specifications, etc.
in consideration of individual sales of gas cells and further researchand development.

Fig. 1: Gas cell successfully developed

1. BackgroundAs we announced in “Commencement of Research on Application
Using a Miniature Atomic Clock and Atomic Clock” dated July 6, 2020, we have conducted the joint researchof application using the miniature atomic clock and atomic clock with Professor Takahito Ono of School ofEngineering, Tohoku University as the research representative.
2. About miniature atomic clocks and gas cells
Miniature atomic clocks are currently used for satellites, planetary exploration spacecrafts,
communication base stations, etc., and expected to be mounted on mobile terminals such as smartphones,etc. and power control systems, etc. such as smart grid in the future. For example, when used for timesynchronization, it can be synchronized with UTC (Universal Time Coordinated) from GPS (GlobalPositioning System) signals to minimize delay of signal transmission time between multiple bases andbetween terminals, which enables to reduce delay of video and sound of web meetings, etc. that have beenbroadly used recently.
This miniature atomic clock has a small container with glass window thereon, where alkaline atom calledgas cell is encapsulated. With incident laser light into this gas cell, quantum interference phenomenon
called CPT (Coherent Population Trapping) resonance is caused to extract the signal equivalent to thedifference of energy levels of alkaline atoms and output the stabilized clock signals. The gas cell greatly
determines performance of the miniature atomic clock and has been in process of many developments atlaboratories, etc. worldwide, but there is an issue in the production method where cost problems remained.
Then although relatively easy production method using solid materials was applied, there was an issue tobe solved in the size and performance.

Laser light
TEMPAXglass

TEMPAX glass

Alkaline atomdispenser

TEMPAXglass

Laser light

TEMPAXglass

Fig. 2: Gas cell using alkaline atom dispenser (solid material including alkaline atom) (a) The
conventional-type gas cell with dispenser remaining (b) Gas cell verified in this experiment.
The dispenser was separated to achieve downsizing, high performance, and cost reduction.

3. Development of concern
We invented the new gas cell production method to solve the above problem, applied for patent,
proceeded with production and evaluation and succeeded in such verification (See Fig. 1). This production
method uses the technology called MEMS (Micro Electro Mechanical Systems) applying the semiconductormicrofabrication technology, achieving downsizing to a half of the gas cell produced by the conventional
method (See Fig. 2).
The details will be announced at the 38th “Sensor Micromachine and Applied System” sympodium to beheld online through November 9, 2021 (Tue) to November 11, 2021 (Thu).
4. Future approach
The gas cells with alkaline atom encapsulated in are used for light quantum sensors such as highprecision magnetic sensor and gyroscope sensor, etc. besides miniature atomic clocks and the market isexpanding. We will accelerate development of miniature atomic clocks using new gas cell as well asentering the market by conducting hearing the specifications, etc. in consideration of individual sales of gas
cells hereafter to promote establishment and application of the basic technologies.
As we announced in the “Notice on Commencement of Joint Research with Tohoku University (SendaiCity, Miyagi Pref.)” dated February 14, 2019, we are proceeding with the joint research with Yasubumi
Furuya, Academic Researcher at Tohoku University, Micro System Integration Center (former Speciallyappointed Professor at Tohoku University, Emeritus Professor at Hirosaki University) as the researchrepresentative for the research and development of the optimization device control / monitoring system of
surplus power which is expected to be utilized in the natural energy (solar power, wind power, biomass,
hot spring heat, etc.).
While needs of the time and society drastically change, we aim for business expansion by finding issues
and additional needs and expanding from the existing technological area to a new area. With
communication (5G), environment, disaster measures as the keywords and by providing solutions in the“communication” and “energy” fields which will become the infrastructure of smart cities, we will contributerealization of “decarbonated society.”