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How to drive DC cctv lens iris?

Discussion in 'Electronic Design' started by [email protected], Oct 14, 2007.

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  1. Guest

    Can anyone point me to any information about driving the DC controlled
    iris of a cctv lens? These things have two coils, a driver and a
    damper. Voltage/current for both is normally supplied by the camera
    (standard 4 pin connector), and I guess there must be a standard but I
    can't find any information/specification about how to drive the two
  2. Tim Wescott

    Tim Wescott Guest

    Two coils suggests a stepper motor to me, but I'm just guessing.

    Tim Wescott
    Control systems and communications consulting

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
  3. Guest

    It's defintely analog, I believe something like a meter movement.
  4. JosephKK

    JosephKK Guest

    posted to
    It sounds like a voice coil type positioner with a feedback coil.
    Perhaps a lot like head positioners in disk drives.
  5. mpm

    mpm Guest

    Honestly, I just don't remember how this is done...
    It's been 10 years since I fooled with this, but as I recall, the
    solution was in fact pretty simple.

    Rather than guess, let me direct you to either Pelco or Panasonic.
    Both make CCTV gear and might have specs / white papers on their
    Pelco also makes camera controllers (Panasonic: lenses and cameras).
    Either one should be able to help.

    Yes, there is a standard. (actually, there are a few, and probably
    some proprietary stuff out there too), but I recall -at the time- most
    of the commercial gear had the same basic requirements.

    Try Pelco first, they're smaller and you're less likely to get lost on
    their site.
    Good luck.
  6. mpm

    mpm Guest

    Flashback (??)
    I hit the enter key and then I remembered something...
    I think the auto-iris is wide open, and you just apply a voltage to
    close it down.

    I could be wrong about that, but something tells me that's what we
    It was a long time ago, so check it before burning anything up. -mpm
  7. JosephKK

    JosephKK Guest

    mpm posted to
    That is the general default, however you can order it with autoclose
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