Message archive

We are going to hold The 6th "Super HIKARIJUKU" Kid's Photonics school / 第6回こども科学の教室 スーパー光塾を開催します

posted Sep 7, 2015, 7:58 PM by 田中千秋   [ updated Sep 9, 2015, 12:02 AM ]

“Why do fireflies glow in the dark? ” “How can cameras record a moment as a photograph?” “Why is the rainbow colorful?” These questions that everyone must have wondered once about can be explained by the mysterious nature of light.

We are going to hold “Kid's Photonics School” -Super "HIKARI JUKU"- again on 23rd November this year and provide several easy scientific experiments or lectures with kids. We would like elementary school students to learn about “light” joyfully and feel familiar with science. This school is ordinary held by Photonics Center, the department of engineering and OSA/SPIE student chapter in Osaka University. Approximately 50 elementary school kids will be invited to this event every year and we focus a main theme on optics and provide several easy scientific experiments or lectures with kids.

It will be the sixth time for us to have it this year. This year, we would like elementary school students to see the unexpected sides of light through experiments, lectures, and exhibits. That is why we made “amazing light -the unexpected sides of light-” a theme for the Photonics Kid’s school. We are doing the best to prepare many exciting light experiments including PIKAPIKA: doodling with light (making twinkling paintings by a penlight on photos), Marble Big Light (expanding small paintings on a plastic sheet by using a marble as a lens) and more.

You will be able to apply for participation in this school until 20th October 2015. Please don’t miss it and let’s become a Doctor of Light!


You can see photos from the last year’s school on our Facebook page, here.


6th Kid's Photonics School” -Super "HIKARI JUKU"- Student President,







第6回子ども科学の教室 スーパー光塾 学生統括 伊藤健

Spectrometer Exhibit / 「分光器展」

posted Jul 27, 2015, 4:53 PM by 田中千秋   [ updated Jul 27, 2015, 4:55 PM by フォトニクスセンター eラーニング ]

The “Spectrometer Exhibit: Instruments that Separate Light into the Colors of the Rainbow” was held at the Osaka Science Museum. I was thrilled to visit the exhibit, due to the fact that they were presenting measuring instruments that I use on a daily basis. One of the displayed items that particularly caught my eye was a spectrometer used in the early 20th century. More than half of the spectrometer’s housing was formed of wood, and a photographic plate was used for recording the spectra. Today the photographic plate has been replaced by a CCD camera, and the rotating mechanism of the optical element is now controlled electrically. Despite this, the internal construction is not much different from modern apparatuses. In fact, the device even employed quartz for the internal prism and lenses, a clever solution that allows passage of ultraviolet light while enabling analysis of a broader range of light wavelengths. This spectroscope was displayed alongside emission spectra of the various chemical elements that were acquired at the time the spectroscope was in use. It was startling how vivid the spectra appeared on the photographic plates. As I gazed at the images, I began to speculate how the scientists using these apparatuses in those days must have felt catching a glimpse of a world no one else had seen. Another part of the exhibit I found of great interest in addition to the displays of equipment were images of fireworks against the backdrop of a night sky in which the light had been separated into its spectral components.
Viewing this exhibit took me back to the Super Light School (Science School for Kids) at the Photonics Center. I participated in the first ever installment of the school. The elementary kids who took part in the class and I built a spectroscope to observe familiar forms of light, such as sunlight and fluorescent light. I was nervous in the days leading up to the class because I don’t ordinarily have many opportunities to speak with elementary kids, so I used some close connections to get some advice from an elementary school teacher. When visiting the teacher’s school I was astonished at how small the desks and chairs in the classroom were, bringing up altogether different worries from a physical perspective. I had prepared vivid slides with colorful rainbow schemes to attract the kids’ attention, but the teacher advised me to be careful about using too much color as brilliant colors can make some kids feel ill, so I revised my presentation at the last minute. Thanks to the advice I received from numerous people, I was able to enjoy myself in the class, albeit still being somewhat nervous. The spectrum shown on this page was acquired with the spectrometer that we used in the Super Light School. While the spectrometer is formed of a simple construction of pieces cut from a CD and cardboard paper, we were able to observe common sunlight separated into a brilliant rainbow of colors.
While light is so common in our everyday lives, we don’t often have an opportunity to get to know the science of light. Through exhibitions, like this spectrometer exhibit, the Light School, and the activities performed by everyone at the Photonics Center, it is my hope that the science of light will become more accessible to everyone.
Jun Ando, post-doctoral research fellow, Osaka University

大阪市立科学館で「分光器展 ~光を虹色に分ける機器~」が開催されていました。日常的に使用している計測機器が紹介されるとあって、嬉しくなって見学に行ってきました。展示物の中で一際目をひかれたのは、20世紀前半に使用されていた分光器でした。筐体の半分以上は木製で、スペクトルの撮像には写真乾板が用いられていました。今では写真乾板はCCDカメラに置き換わり、光学素子の回転機構は電動制御になっています。それでも、内部の仕組みは現代の機器とほとんどかわりありません。むしろ、分析できる光の波長の幅を広げるため、内部のプリズムやレンズに、紫外光を透過しやすい石英を用いる工夫がなされているほどでした。この分光器が現役の時代に取得した、様々な元素の発光スペクトルも併せて展示されていました。写真乾板に映し出されたスペクトルの鮮明さには驚かされました。当時この機器を使って、これまで誰も見た事のない世界を垣間見ていたのだろうかと、想像を膨らませながら眺めていました。機器の展示の他にも、夜空に打ち上がる花火を、光の色毎に分けてスペクトルで表示する映像などもあり、興味深くながめていました。







博士研究員 安藤 潤

See things from a wider perspective to think deeper/視野を広げて,深く考える

posted Jun 7, 2015, 10:10 PM by 音野多映   [ updated Jun 7, 2015, 10:11 PM ]

The rainy season will come soon. 5 months have passed since I came to Osaka. In this period, I attended various events and activities related to science, and had chances to communicate with others working in different fields. These days were very exciting for me because I could think about how my work makes a social contribution, and the relationship to other’s work in different fields. Working in new place makes me realize the importance of widening my perspectives throughout exposures to different values again.
Now I’m working on fluorescence microscope. Fluorescence microscopy is one of the optical microscope. In microscopy, fluorescent materials are used to label the region which you want to observe in specimens. Since only fluorescence materials emit light by irradiation with a particular wavelength of light, it is possible to observe the only region labeled by the fluorescent materials. 
The above technique is also used in daily life. For example, when you go out, you turn off all electrical products in a room. Although recently most products have LED light indicator to show if it is on, you might miss or forget to turn off some of those many products.  In such case, first turn off the room light, and you can easily find which is on and emitting light. In this example, LED light indicator is used instead of fluorescent materials. Of course you can apply such technique for other situations.
Needless to add, thinking deeply is important for researchers and engineers. However, I think it is also significant to pause to think through the relationship with others in sometimes, because I felt there were hints/clues to think various ways for social contribution or new findings through this period.

The picture was taken with my cell phone. If I widen my perspectives, I would find more interesting things around me.  I have to keep studying and thinking to get some ideas through my life.

Yasunori Nawa, Kawata laboratory
 このように書くと,顕微鏡の為の技術と思われるかもしれませんが,似たようなことは普段の生活でも使われます.例えば出かけるとき,電気製品の電源をきるかと思います.最近では,各製品にLEDがついており,その光で通電しているかどうか知らせてくれるものが多いですが,製品の数が増えてくると,うっかり見落とす事があるかもしれません.そんな時は部屋の電気をまず消します.すると,暗がりの中から消し忘れているものだけが光って教えてくれます. この場合,蛍光物質ではなく,LEDを利用していますが,これ以外にもたくさんの応用があるでしょう.

河田・藤田研究室 PhD. 名和 靖矩

Photonics Center e-Learning

posted Apr 22, 2015, 4:50 PM by フォトニクスセンター eラーニング   [ updated Apr 26, 2015, 7:06 PM ]

Greetings! I am Chiaki Tanaka, manager of e-Learning at the Photonics Center.

The hustle and bustle of a new school year and the warm sunshine of spring are upon us. But in this season that brims with sunlight, how much do you really know about light in general?

Many people are interested in topics concerning living and health. Some believe morning sunshine is important for establishing their rhythm for the day, and women might be particularly concerned about skin damage from sunburn. Although we are so familiar with it, there are so many things that we, as non-technical people, do not know about light, which is essential for all living things.

Unlike the electron, which had its day in the 20th century, the photon by its nature can freely travel through the atmosphere, water, and living matter. The photon is said to be the key to core technologies of the 21st century in the fields of energy, environment, ICT, advanced manufacturing, safety and security.

Clearly, light has great potential. But when one who is not a researcher versed in the field tries to learn the fundamentals of light, imposing barriers spring up in the form of physics and chemistry equations, which can end up giving that individual cold feet.

I am pleased to announce that Photonics Center e-Learning now offers a more effective teaching program on the subject of light. Here I would like to take the opportunity to introduce the e-Learning program. We have opened the e-Learning program only for the members in Osaka University and the partner companies who have been trying to making invention together. 

Photonics Center e-Learning

At this time, Photonics Center e-Learning offers Photonics Courses covering photonics from its fundamentals to advanced technologies, socially beneficial Photonics Entrepreneurial Courses for innovation creation in the photonics industry, and openly available (no login required) courses, including Common Facility (Equipment) Operation Courses and general courses. Last fiscal year, we released five new Common Facility Operation courses, in which Photonics Center technicians provide an overview of and describe in detail the use of state-of-the-art photonics equipment.

e-Learning Common Facilities Operation Courses

Access to Photonics Center e-Learning is limited to Osaka University faculty and students and Photonics Center partners. Osaka University members may access the course content by logging in with their Osaka University Personal ID through the Campus Authentication Service. Members of partner organizations who are accessing the site for the first time will be issued an ID and password with which they will have access to the content.

The lectures, comprising slides that incorporate illustrations, are attractively designed to provide visual stimulation and to leave a vivid impression. Each video is also kept to about 20 minutes in length so that the viewer can maintain his/her attention and repeat the lecture as desired. PCs, smartphones, and tablet devices are all supported.

Access to Photonics Center e-Learning is a privilege reserved for Osaka University faculty and students and Photonics Center partners.

I am convinced that the courses, which start with fundamentals and extend to applications, will help you gain a deeper understanding of the possibilities of light. Please visit the site and see for yourself.


Chiaki Tanaka
e-Learning Manager
Photonics Center

こんにちは。フォトニクスセンター eラーニング担当 田中です。






【フォトニクスセンター e-ラーニング】

現在、フォトニクスセンター e-ラーニングでは、フォトニクスの基礎から最先端まで学べる「フォトニクス講座」、フォトニクスで産業イノベーションを生み出し、社会貢献を目指す「フォトニクス起業講座」、その他、ログインせずに見られる、共用装置利用講座、一般講座があります。昨年度は共用装置利用講座を新たに5本公開いたしました。フォトニクスセンターの技術職員が、光に関わる最新鋭の装置について、その概要から使い方まできめ細やかに紹介しています。

【e-ラーニング 共用装置利用講座】





2015年4月23日 フォトニクスセンター 田中 千秋

Turning on the light

posted Mar 9, 2015, 6:27 PM by 田中千秋   [ updated Mar 10, 2015, 1:02 AM ]

I used to view light as something simply to view something else by. The messenger which, by itself, is not the important thing. Light bouncing off something tells you something is there. Light through a lens is bent into an image, and recorded, and again tells you something is there. I think this is the most common view of light. As a kid I was interested in mechanical things, and needed light in order to find the screw, needed light to read the green phosphor display on our now ancient Apple II, but didn’t really notice how light interacts with things. These interactions are right there in front of us but unless pointed out are easily missed. The phosphor-based tv that we all watched is a complicated dance of electrons and photons, and its reverse process, the photoelectric effect, wasn’t even discovered until 100 years ago. Even just the simple process of light scattering can lead to a beautiful sunset, a rainbow, and the rich tones in a photograph. But as scientists we always look deeper, and looking deeper at scattering shows the scattered light can carry the actual molecular signature of the compound that scattered it. Strong light fields can change the material world in a way that then changes the light, in a complex feedback loop. Even in your body, light is the conduit for one of the most deep cognitive interactions you have with the external world. When you see something, you see the distribution of photons, arranged by space and separated by energy into bins of color, converted into electrical signals by your eye, and then mapped into a 3d representation of the world by neurological systems that we still don’t fully understand.
Such is the nature of light. While it is fascinating to dwell on how such wiggles in electromagnetic field pervade our life, on a more practical side, scientists usually need to produce something of use. This means in a laboratory, we push towards not only understanding, but manipulating and analyzing fields of light. To go further, we exploit the interactions between light and the material world. This can produce higher resolution in microscopes, light-switchable interactions to assay specific molecular changes, or unlock new communications technologies. My view on it all has more or less evolved from “please turn on the light so I can see what I’m doing” to the current state where “light is what I am doing”.

March, 10th, 2015
Nicholas Smith
Immunology Frontier Research Centre

The 5th super light school / 第5回こども科学の教室 スーパー光塾

posted Feb 9, 2015, 10:25 PM by 田中千秋   [ updated Feb 10, 2015, 12:36 AM by 倉田早織 ]

Calculus, quantum mechanics and theory of relativity. We always face some difficult words and complicated mathematics when studying science. But I think the original aim of studying science was quite simple. When we see a new phenomenon, we just feel why the strange but interesting phenomenon happens and think if there are any rules. I think that’s the reason why ancient people started science. However, through our studying in junior high school to university with complicated theories and bothersome experiments, we no longer recall that kind of pure impressions, don’t we?

We held the 5th science school for kids called “the super light school” on Nov. 24th 2014.The pure impressions have come up in my mind when seeing the kid’s smiles and their looks of amazement. The super light school offers kids classes with experiments on light and provides interesting toys using nature of light. In this time, more than 300 children applied to attend for 50 seats. We have 40 staffs for the 50 kids and all the staffs are students and postdocs in Osaka university. We focused to let the kids know the fun and fundamental science of light 7 months before.
The 5th super light school provided 5 classes which could connect the nature of light to the kids' interests. (Website: ) 

Here I would like to introduce an example “enlarger ray gun with glass ball”. To project enlarged images or movies on a wall, we usually use a projector. And lens are usually used for projector to enlarge images. We prepared a hand-made kit which replaced the lens and the light source with a glass  ball and LED light, respectively. Kids contracted the kits by themselves and drew something on a plastic board which they wanted to enlarge. When illuminating the drawing of kids by the enlarger ray gun, the drawings were projected all over the wall. The kids were so excited and smiled with their enlarged drawings.
Hope the kids who attended to the super light school remember these experiences and the joy of science through our classes when they grow up.Thank you very much for joining our 5th super light school!!

Ryosuke OKETANI, Kawata Laboratory





河田・藤田研究室 博士後期課程1桶谷亮介

Hatsuyume: my first dream of the New Year/初夢 2015

posted Jan 4, 2015, 9:08 PM by 田中千秋   [ updated Jan 4, 2015, 10:08 PM ]

Hatsuyume: my first dream of the New Year  Jan. 1, 2015

Artist is my longed-for job. I had longing to be a painter or a photographer. It is only a fantastic story, though, as I had never learned painting at classes and art clubs. Even taking nice photos at all, I have bought lots of cameras so far. I have chosen the Applied Physics Department of Osaka University, because I knew that it is well-known in the study of "light". I was fascinated at the pure color of the laser in the laboratory experiment. After being assigned to a laboratory, I concentrated on development of photographs in a dark room, occasionally, all day long forgetting all about the time. When photos were emerging on printing papers under an enlarger, I was thrilled always by myself. Also I was fascinated by starry sky and micrographs. Dissertation was a study of image processing. The theme was to restore from a blurred photo a sharp image by means of applied mathematics. At that time, AFM, femtosecond laser and blue LED were not invented and fluorescent proteins were not discovered and there were no personal computers and CCDs. Only soldering iron, punch card and paper tape reader and photographic development in darkroom were available technologies. Still there was no air conditioning in the laboratory.

Time passed and it is now in 2015. Even now, I am fascinated by the world 1) of color and form light makes. Developing microscopes to see much smaller things than I could see when I was a student, we are keen to see,   read and manipulate nano world by utilizing photon. Such an idea could be out of date, but Nobel Prize in Chemistry for the year 2014 was awarded to super-resolution fluorescence microscopy. My research is not related with observing stained fluorescent molecules, but is super-resolution microscopy to image the Raman scattered light from molecules constituting the substance using a metal needle with nano-scale apex. I dream to see natural and artificial world as they were with nano-scale resolution. This year, 2015, is 200 years after the Fresnel‘s wave theory of light and 150 years after the Maxwell’s electromagnetic wave theory of light and thus it is to celebrate as "international year of light" all over the world. It is privilege of Osaka University Photonics Center to participate these events and to support as a sponsor, only one from Japanese universities so far. My dream may not be bad as I think. What is your Hatsuyume? Is it likely to come true?

Satoshi Kawata

Executive Director of Photonics Center, Osaka University

初夢 Jan. 1, 2015



1)河田 聡 「三四郎が見た光と色の科学」 Oplus E:2009年1月号

build a worldwide student network through student conference / 学生カンファレンスで世界に広がるネットワークを作る

posted Sep 30, 2014, 4:46 PM by 田中千秋   [ updated Sep 30, 2014, 6:16 PM ]

Hello, I am Takayuki Umakoshi, the president of Osaka University OSA/SPIE student chapter. Last year, our chapter and Photonics Center organized the student conference “Asia Student Photonics Conference 2013” to build student networks among Asian countries. This year, we had a theme “Expand the network from Asia to the world”.

After due deliberation, our chapter decided to hold the IONS in Hokkaido University because it is actively taking place worldwide, and IONS has been never held in Japan!  Also, the international conference “JSAP-OSA joint symposia” was held right after this student conference in Hokkaido University. So, we thought that it could bring more students who were planning to attend the symposia to the IONS. Moreover, because we could collocate JSAP Student Meeting and Asia Core Student Meeting, we could invite more students in wide range network. We have no doubt that these factors led to successful result to make this conference attractive for many students from all over the world, and also to achieve our goal. We are very pleased to host IONS, and to have this opportunity. Besides, we also organized Asia Core Student Meeting 1st round at Photonics Center in Osaka before the Hokkaido meeting. The past two years, we have made strong network through the Asia Core student seminars in Osaka. The 1st round gave us the wonderful opportunity to reinforce the student network with our neighbor countries in Asia too.

              It was a four-day conference in total, which is the longest event we have ever held, and 63 students attended from 11 countries worldwide. More than two-third of them were foreign students, and we got attendees even from the outside of Asia such as the U.S., the U.K., Spain, Morocco and Armenia, which made this conference more international. Furthermore, we prepared the special conference program which attendees were able to easily build networks through. We are very sure that we built the huge student network spreading all over the world.

              I believe that this great success could not happen without the strong network among our chapter members. Most of all things have been done by students such as preparation for conference room, invitation of speakers and funding. Even though chapter members were very busy with their own research, we have cooperated with each other for the success of this conference. We could make this great conference successful thanks to the strong network among chapter friends who have spent hard but fun research life together. Through organizing this conference, I could have learned the power of the network more than I expected.

              I wish the power of the network built in the IONS among students will contributes to developments on science and society in the near future.

October 1st, 2014
Takayuki Umakoshi, the president of Osaka University OSA/SPIE student chapter

大阪大学OSA/SPIE学生チャプター代表の馬越です。昨年、アジア圏の学生間ネットワーク構築を目指しAsia Student Photonics Conference 2013を学生チャプターとフォトニクスセンターで開催しました。そして今年、我がチャプターは「ネットワークをアジアから世界へ」という目標を掲げました。

 世界中から学生に来てもらうためにはどうしたらと考え、今回IONSという世界的に活動している学生会議(今回が日本初!)に学生チャプターはチャレンジしました。国際会議JSAP-OSA joint symposiaに付随する形で北海道大学にて開催したのも、世界中から参加者を呼び込むためです。さらに、JSAP Student Meeting(応用物理学会学生チャプター主催)とAsia Core Student Meeting(大阪大学学生チャプター・フォトニクスセンター主催)を同時開催することによって、学生コミュニティの垣根を越えた大規模なネットワークの構築を目指しました。もちろん過去2年アジアコアセミナーを開催して築いてきた近隣国であるアジアの学生間の関係を深めるのも大事です。上記会議の前にはフォトニクスセンターにてAsia Core Student Meeting 1st roundも開催しました。




大阪大学 OSA/SPIE 学生チャプター代表  馬越 貴之

The Eyes Say More Than the Mouth? / 目は口ほどに物を言う?

posted Aug 18, 2014, 12:10 AM by 田中千秋   [ updated Sep 4, 2014, 12:08 AM ]

Last year my eyesight suddenly worsened, deteriorating to less than 0.1 vision even with correction.
When I went to the doctor to find out what was wrong, I was told the eye lenses were distorted.
Surgery was performed immediately to partially remove the lenses and insert artificial ones.
During the operation, the movement of the eyeballs was stopped, but the operation began with my seeing as I normally see.
Then it felt like I was inside a tunnel of light.
When the bandages were removed three days after the operation…everything looked distorted!
A 350ml can of beer on the supermarket shelf looked like a mini-sized 250ml can.
I felt cheated.
Was the surgery a failure?
Would my eyesight remain this way for the rest of my life?
At the time I was fairly depressed about the situation, but now—more than six months later—it’s absolutely no problem.
That’s right, you get used to it.
The performance of the human eyeball (lens) is essentially not very good—in fact, it’s said to be inferior to that of a QuickSnap disposable camera or even a toy camera.
At the stage that an image of even a straight line is formed in the retina, the line is not clear.
However, humans are capable of differentiating between straight and crooked lines.
According to biologists, this is because over many years a person sees many lines and their brain learns what is a “straight” line and makes corrections accordingly.
Moreover, humans use only the center of the eye lens, minimizing the effects of distortion as far as possible.
To compensate, the eyeball moves extremely rapidly as the brain processes the image, creating balance.
In recent years, expectations have been held for glasses-shaped wearable terminals, and in the future, a day may come where it is possible to project everything in one’s field of view from a high image quality glasses-shaped flexible monitor.
When one looks directly at a certain point, the monitor automatically zooms in on that point, combining with a rear view to provide 360 degrees of vision; at first this would make you dizzy, but in six months the brain become accustomed to this new vision and it becomes indispensable…But this is not likely to happen for some time yet, is it?
But if life with a 100% wearable monitor were truly to become a reality…
At that time, the saying “The eyes say more than the mouth” will fall out of use as the wearable terminal will look into people’s eyes and obtain information directly.
When that happens, it may truly be the age of “the eyes saying more than the mouth”.

August 18th, 2014 Kazunari Kimino, Photonics Center 

2014年8月18日 フォトニクスセンター 君野 和也

A big discussion of "Cultivation of researchers and merit-based institute"; 45 participants debated actively in the 39th Colloquium on June 2nd / 「研究者育成と成果主義の研究機関」大討論会:6月2日第39回コロキアムで45人が白熱議論

posted Jun 3, 2014, 12:54 AM by 田中千秋   [ updated Jun 15, 2014, 4:31 PM by 倉田早織 ]

We held a debate session with the theme of "cultivation of researchers and merit-based institutes" and participants talked about "Dr. Obokata's case". We had the honor to invite a young researcher from Institute of Physical and Chemical Research, Mr. Hisao Inoue of the freelance journalist, and Mr. Takeshi Nemoto from Mainichi Newspapers Co., Ltd. We could hear valuable opinions about "Dr. Obokata's
case" from each position of them.

Prof. Kawata presided this debate session as a moderator and 45 participants, which included teaching staffs(professors, associate professors, assistant professors etc.), companies, lab workers and students, exchanged their opinions actively. They debate about keywords like "Nature", "mass media", "national government", "MEXT", "copy & paste", "people on the Internet", "ethics education", "collaboration research", "fix-term researcher", "fix-term research institute", "female of 30 years old", "the ethical doctrine that human beings is fundamentally good against scientists", "reproducibility".

While a number of precarious postdoctoral have been "made" by the project of MEXT to produce ten thousands postdoctoral, they are also screened through accomplishments. There were some opinions that this social system made situations that researchers were doubted to fake the result of research, and actually some researchers did fake.

Prof. Kawata closed the session with pointing out the necessity of reforming system. A good example is Max-Planck-Gesellschaft in Germany, which is gave assurance of autonomy by financial support from national government, states and private sectors.

We could find some feedbacks after the event. And one opinion from them said he was wondering the influence of Japanese nationality to this matter, what would happen if this matter had happened in United States. In another opinion, he said they should change the screening system in some areas  other people have difficulties to find someone's dishonesty. We are so pleased to have many feedbacks that said they could enjoy this colloquium to hear various thoughts or they wanted much more time to debate in questionnaire after the colloquium.

We thank all of you for participation.

June 3rd, 2014 Saori Kurata, Photonics Center





2014年6月3日 フォトニクスセンター 倉田 早織

1-10 of 34