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luohongdaidai / linear-book-scanner

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Sensor and electronic part numbers and specifcation #1

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Not sure if this is your preferred method of contact for these sorts of things 
but I would like to learn more about the electronic side without having to 
invest in and take apart a scanner myself. 

Part numbers for the sensor component would be a great start. Apart from that a 
bit of spec that could help find alternatives too and even the protocol that 
the scanner uses (although I gather it is a fairly simple virtual-serial 
protocol).

Really love the design!

Original issue reported on code.google.com by kaspar.b...@gmail.com on 16 Nov 2012 at 2:15

GoogleCodeExporter commented 9 years ago 
The electronic parts used in the prototype can be found on page 19 through 21 
of the design document. No custom protocols were created for this prototype, 
unless you consider sending a newline over a serial connection to be a protocol.

Original comment by jbrei...@google.com on 20 Nov 2012 at 1:20

GoogleCodeExporter commented 9 years ago 
Thanks for the response. 

on page 19 it says:

>Canon imageFORMULA DR-2510C Office Document Scanner
>Quantity: 1
>The prototype uses the scanning sensors and circuitry from this commercial 
scanner.

My problem is I want to find out more about the sensor without having to buy 
the whole scanner. In the tech talk it was mentioned that the sensors are cheap 
on their own. How do you know this and where can I buy them? Is there no part 
number printed on them?

Original comment by kaspar.b...@gmail.com on 21 Nov 2012 at 8:29

GoogleCodeExporter commented 9 years ago 
Just did a bit more research and came up with "Canon MH7-7038-030" and "Canon 
MH7-7038-000". That sound about right? Any ideas on the difference between the 
two?

Original comment by kaspar.b...@gmail.com on 4 Dec 2012 at 2:30

GoogleCodeExporter commented 9 years ago 
Contact imaging sensors are relatively inexpensive in quantity. The specific 
part in the prototype was labelled MH7-7060 and I've linked to the 
specification sheet. I do not know of any retail sources for this part. 
However, the CIS is useless by itself. You need driving electronics to capture 
an image and transport it to a computer. The easiest/cheapest way I know of to 
get such electronics is to disassemble a retail sheetfed scanner.

Second, as explained in the video, a CIS has trouble fitting into the apex of 
the linear book scanner even after dramatic modifications with a belt sander. A 
better approach would be to use a CCD linear sensor and a lens. While CCD is 
more expensive, it is not cost prohibitive. For example, there are plenty of 
CCD based sheetfed devices that retail for similar prices to CIS sheetfed 
devices. While I think would be the right way to go for future prototypes, I do 
not have a recommendation for a particular CCD and corresponding driver 
electronics. 

http://www.canon-compo.co.jp/e/product/detail/090721010002.html

Original comment by jbrei...@google.com on 4 Dec 2012 at 8:00