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How to block light from a lens?

Discussion in 'Electronic Design' started by soundman, Aug 27, 2004.

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  1. soundman

    soundman Guest

    Hi,
    I need some kind of light blocking mechanism (ie. a shutter)
    to block light from the front of an 1in diameter optical lens,
    under electronic or electromechanical control. Shutter speed is
    not critical and On/Off control is fine - no need to control
    the amount of light passing through.
    Does anybody know of a device which would do this job?
    Is there an LCD type device available which would accomplish
    this (ie. allow light to pass straight through or get fully
    blocked, under electronic control)?

    Suggestions?

    Thanks,
    John
    (PS. get rid of all the numbers in my email to reply direct).
     
  2. Jim Thompson

    Jim Thompson Guest

    I vaguely recall a plexiglass-like material which behaved somewhat
    like a Kerr cell (used for advertising in store windows, turning
    displays on and off).

    ...Jim Thompson
     
  3. Leon Heller

    Leon Heller Guest

    A mechanical shutter actuated by a solenoid will probably be the easiest and
    quickest way.

    Leon
     
  4. Dismantle a cheap camera. Most modern cameras, have electronically
    controlled shutters.
    The problem with LCD shutters, is that they remove a lot of light, when
    'open'. Look at:
    http://www.bnonlinear.com/pages/xtshutter.html who offer complete 'off the
    shelf' assemblies.
    If space is not a problem, consider a rotary shutter. Rotary solenoids are
    readily available, or a simple stepper motor. A disk with a cut out
    segment, then allows a shutter action. Much the cheapest solution.

    Best Wishes
     
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