RFD: optical.servo.coin.marker

[Aubrey McIntosh, Ph.D.]

i need some help with new system my company is developing for purpose of
marking rare
coins with security code system uses precision laser to melt surface making
low
contrast 1 mm by 0.1 mm barcodes that is essentially invisible to observer
unless coin
catches light just right you can see system at http://shin-ra.com/index_senjutsu_rokko.html

i have tested system with many types of coins including ancient coins & coins
from
every nation i am having problems with aluminums coins at low laser power the
barcodes
is undetectable by scanner but at slightly higher laser power barcodes becomes
very
visible to eye

i am thinking of using optical servos in attempt to search the perfect power
setting is
anyone here familiar with such optical servos devices?

Try to shroud the coin in an argon atmosphere during the etch.

 

[Draco]

Wouldn't this lower the value of these rare coins? I can understand the
need to securely identify valuable coins. But, etching in a bar code
IMHO would degrade the coins. Is there some other less invasive way of
tagging these coins?

Just wondering.

Draco


Getting even isn't good enough.

 

[Spehro Pefhany]

Wouldn't this lower the value of these rare coins? I can understand the
need to securely identify valuable coins. But, etching in a bar code
IMHO would degrade the coins. Is there some other less invasive way of
tagging these coins?

I believe some items (such as integrated circuit packages) are marked
by coating the surface with a film and then exposing the film to laser
light. This method would leave the option open of removing the film.


Best regards,
Spehro Pefhany

 

[Frank Bemelman]

I believe some items (such as integrated circuit packages) are marked
by coating the surface with a film and then exposing the film to laser
light. This method would leave the option open of removing the film.

Did you see lightscribe ? HP uses that for printing DVD's.

http://www.lightscribe.com

 

[fletch]

there will be no market for such a product -- it would greatly lower the
value of the coins. think of something else to scribe ...

--keith

 

[Tim Wescott]

I believe some items (such as integrated circuit packages) are marked
by coating the surface with a film and then exposing the film to laser
light. This method would leave the option open of removing the film.

Something removable isn't an option if you're interested in theft
protection.

 

[Dustbin]

i need some help with new system my company is developing for purpose of
marking rare
coins with security code system uses precision laser to melt surface making
low
contrast 1 mm by 0.1 mm barcodes that is essentially invisible to observer
unless coin
catches light just right you can see system at http://shin-ra.com/index_senjutsu_rokko.html

i have tested system with many types of coins including ancient coins & coins
from
every nation i am having problems with aluminums coins at low laser power the
barcodes
is undetectable by scanner but at slightly higher laser power barcodes becomes
very
visible to eye

i am thinking of using optical servos in attempt to search the perfect power
setting is
anyone here familiar with such optical servos devices?

How has this got onto soc.men?

D.

 

[wkearney99]

Sounds like a tremendously BAD IDEA. You're talking about destroying the
surface of the coins, albeit in a minute way. Doesn't seem like all that
good an idea.

 

[badgolferman]

Genome, 8/9/2005, 7:33:45 PM, <[email protected]>
wrote:

Please correct your time or your time zone. You are posting from the
future.

 

[Jeff Wisnia]

Did you pick up on his stated dimensions, Tim?

He's talking about a barcode mark that's only about .004" high by .040"
wide and barely visible. Shure enough, my tired eyes would never find it
without magnification.

I don't think I'd have a problem paying market price for a rare coin
with that kind of mark on it, if it gave me even a tiny bit more chance
to prove it was mine and recover it if it got "grew legs" and later
turned up somewhere.

Something removable isn't an option if you're interested in theft
protection.

But it sounds like what he described would be "removable" by someone who
knew it was there.

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

 

[Tim Wescott]

Did you pick up on his stated dimensions, Tim?

Actually that wasn't my comment -- Sphero's remark was in reply to
somebody named "Draco" who's original comment doesn't appear on my
newsreader.

He's talking about a barcode mark that's only about .004" high by .040"
wide and barely visible. Shure enough, my tired eyes would never find it
without magnification.

I don't think I'd have a problem paying market price for a rare coin
with that kind of mark on it, if it gave me even a tiny bit more chance
to prove it was mine and recover it if it got "grew legs" and later
turned up somewhere.


But it sounds like what he described would be "removable" by someone who
knew it was there.

True, but a coin without the plastic coating is just an untouched coin
-- a coin with a big rectangular pit in it the size of an anti-theft
barcode is one that says "hello, I'm stolen merchandise".

 

[HeyBub]

I don't think I'd have a problem paying market price for a rare coin
with that kind of mark on it, if it gave me even a tiny bit more
chance to prove it was mine and recover it if it got "grew legs" and
later turned up somewhere.

I'm with you. Mark every valuable thing.

Imagine the Declaration of Independence with a discreent UPC in the lower
corner.

 

[Shawn]

wouldnt hurt to adjust your clock

 

[Tim Wescott]

Jeff Wisnia wrote:




I'm with you. Mark every valuable thing.

Imagine the Declaration of Independence with a discreent UPC in the lower
corner.

In Thos. J.'s own handwriting?

 

[Genome]

i need some help with new system my company is developing for purpose of
marking rare
coins with security code system uses precision laser to melt surface making
low
contrast 1 mm by 0.1 mm barcodes that is essentially invisible to observer
unless coin
catches light just right you can see system at http://shin-ra.com/index_senjutsu_rokko.html

i have tested system with many types of coins including ancient coins & coins
from
every nation i am having problems with aluminums coins at low laser power the
barcodes
is undetectable by scanner but at slightly higher laser power barcodes becomes
very
visible to eye

i am thinking of using optical servos in attempt to search the perfect power
setting is
anyone here familiar with such optical servos devices?

 

[John Carney]

uses precision laser to melt surface making
low
contrast 1 mm by 0.1 mm barcodes that is essentially invisible to observer
unless coin
catches light just right

EEEEEEKKK!!!

PLEASE only do that to circulated Susan B. Anthony dollars and Eunice
Shriver Commemoratives.

 

[clarkent]

Why not just use a metal punch with a serial number. Just postion right in
the center or other focal area and and give it a good whack with a hammer.
Presto, the coin is marked .
Seriously, in this day and age, it would seem prudent to PHOTOGRAPH the
coin and store the image for future reference. Why mess with the surface of
the coin at all!!??
Best Regards, O.E.Pepper



--
"I bought a book on how to get organized..but I can't seem to find it.."

"If I were any happier, I'd have to be institutionalized."
http://peppercoins.50megs.com/
http://search.ebay.com/_W0QQsassZoepepper

 

[Spehro Pefhany]

In Thos. J.'s own handwriting?

What? And have the scanner beeping impotently every time you try to
scan it? I should think that John Hancock would be your man.


Best regards,
Spehro Pefhany

 

[Tony Williams]

This post looks suspicious and may be a troll.

'Genome' is certainly the nickname used by a poster
in s.e.d, but he does not use supernews and does
not post from <[email protected]> .

<[email protected]> , (note the
added s's), is used by another poster in s.e.d, but
he doesn't use supernews either.

Neither of them use the newsreader used for this post.

The GMT in the time and the inclusion of the demon.local
newsgroup suggests one of the Brits who troll d.l.

 

[Paul Burke]

Why not just use a metal punch with a serial number. Just postion right in
the center or other focal area and and give it a good whack with a hammer.
Presto, the coin is marked .
Seriously, in this day and age, it would seem prudent to PHOTOGRAPH the
coin and store the image for future reference. Why mess with the surface of
the coin at all!!??

I think it's probable that manufacturing variations, wear and random
events in the lifetime of a coin (like jangling in a purse) will have
marked the coin in a characteristic way already. So all you need is to
do a scan of the coin's surface and convert that somehow to a
characteristic number, perhaps a checksum. Play about with resolution,
frequency etc. until you get something that's sufficiently unique-ish
and repeatable.

Paul Burke