13 Jan
2005
13 Jan
'05
10:55 a.m.
At 04:19 PM 1/13/2005, Tom Jennings wrote:
Use a laser whose output the tape isn't transparent
to; a "1" is a
heat-distorted/discolored spot. A smaller spot for the "sprocket"
hole/index.
Yes, reflectance rather than mechano-optical hole-or-not
would be much faster. Like a CD, but flexible, on a spool.
Much great surface area than a 34 mm radius band on a 120 mm disc.
- John