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How big is the path of an IR emitter

  1. Jan 10, 2012 #1
    This is a very silly question but anyway.

    When using a remote for a TV or digital channel receiver, how big is the path/signal emitted from the remote when a button is pushed.
    Will it come from a point, thee emitter, and form a cone shape until its picked up by the receiver.

    its a dull question, I know. :)
  2. jcsd
  3. Jan 10, 2012 #2

    Andy Resnick

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    From what I found, most IR LEDs emit into a divergence angle of a few degrees.
  4. Jan 10, 2012 #3
    If you look at it through your mobile phone camera, you'll see it flashing. (...Looking...) Hmm, I'd say it's more like few 10's of degrees. Also IR is reflected well by the walls and furniture, often this reflected light is sufficient to trigger the receiver.
  5. Jan 10, 2012 #4
    Thank you.

    I always use that method when in bed or not in direct path to the TV :) lol.
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