Hmmmmm.... I don't think I've ever seen these stand-alone for sale on
the retail market, but you'll find them in some surplus CCTV and
camcorder lenses. Maybe a junker camcorder. You'd have to take the lens
apart to get to the iris, of course. How many do you need?
Thomas Register would be the place to find manufacturers, and I would
assume most of these will be in Japan, Taiwan, or China.
I'll probably need about a dozen - various sizes - initially. I found a
company who's worked with them before
http://www.picard-industries.com/archive.html#shutter and I'm waiting to
hear back. I'll check the Register. Thanks.
What is difficult is that the prototyping iris units out there are non
linear, and typ have a 90 degree throw. Iris units from SLR lenses will be
burried inside the lens, but need a short linear throw.
If you can motorize your own, go with the latter. GO on ebay, find a power
seller, and see where it goes. It will likely be cheaper than other routes.
And huge! I didn't even ask Pete what the size of the objective lens
would be. I sort of guestimated he's working on something for the 1/4"
to 1/3" imager size.
Pete, I'm glad you found a source. Finding a dozen surplus camcorder
lenses might be tough, but if anyone has this sort of thing, you're
likely to find it at:
American Science & Surplus
Herbach & Rademan
...and in about that order of increasing cost.
The source turned out to be a dead-end. Oddly enough, the requirement wasn't
related to optics. I was thinking an aperture / iris diaphragm could be used
as a very lightweight miniature air flow control. One with a built-in
servo/stepper was so appealing, I just had to find out more. Looks like I'll
have to go back to the drawing board with this one.
Why not use a butterfly valve or a"Venetian blinds" approach? I realize
that a completed unit is nice, but sometimes we're forced to make things.
Another thought is that video camera repair shops often have broken units
that they might be willing to part with.
Sir Charles W. Shults III, K. B. B.
I think the word for it these days is "Bluetooth." That's all anyone
ever talks about.
Not knowing your application, of course, but how about a micro servo
that pinches off airflow in a neoprene tubing? Maybe a little larger
than your iris, but prolly as expensive. You can count on at least
$20-30 for a good micro servo. This is actually a method used in some
factory automation, but in a somewhat larger scale. A bar squeezes off a
liquid going through a tube in order to start and stop it. The tube is
positioned over a V-grove, to facilitate the valve effect. Could be used
for air, but is also good for viscous material.
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