Looking at the microscope looking at how the player's needle moves in the groove of the analog record looks like this

How does the needle trace the groove of the analog record? Although there are many people who have thought about it at once, it takes extraordinary labor to observe the situation. YouTubeApplied ScienceActually shows how the needle moves in the groove of the analog record by using the electron microscope and reworks up to the record needle and tone arm until it reaches there.

Microscopic footage of a needle moving across the grooves of a record | Dangerous Minds
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You can see the appearance and making of the needle of the record player actually moving from the following movie.

Electron microscope slow-motion video of vinyl LP - YouTube


That is why this is how the player's needle traces the groove of the record.


It is like this when you close up. You can see how the needle moves in a sinuous way between the grooves that have been decorated.


"It is easy to see how the player's needle will trace the groove of the record if there is a microscope", but actually Ben Krasnow tried it, but considerable effort It was necessary.


First of all, since it is impossible to put the record which remains circle on the microscope, it starts with cutting the record to an appropriate size.


Put the debris of the record on the slide ... ...


Coat with conductive material.


A record shard that shines silver. Doing this avoids the risk of electrons on the surface of the record being ignited.


In addition, a magnet was used for the needle and tone arm of the existing player, and it was possible to influence electrons, so it was rebuilt newly.


It is like this when setting a newly made needle on a fragment of a record. You can finally see how the needles and grooves are in contact with this electron microscope.


...... However, the image that was projected is very poor in image quality, and I do not know well what is going on.


Therefore, Krasnow captures high resolution images.


Finally we joined the images in Photoshop and succeeded in making GIF animation of 1/400 of the actual speed.


continue,RCAUnique formatCED video discI will look at.


A rainbow-colored surface.


When I looked at the surface with an electron microscope, it seems that the needle is sliding on a slippery surface.


I tried to close up ... ...


You can see that the needle is tracing a slight groove.


Furthermore, because the plastic is processed with aluminum, the CD-ROM has been experimented variously. As a result, it was not cut but as a result of peeling the aluminum on the surface with a powerful double-sided tape, it was observed with a microscope.


This is the surface of CD-ROM. There seems to be a dotted line where 1.6 micrometer of empty space is empty instead of having a groove.