How do red dots work?

How do red dots work?

This is a discussion on How do red dots work? within the General Firearm Discussion forums, part of the Related Topics category; I've been wondering this for a while now. I know the basic red dots have 2 layers of glass, one that allows a projected LED ...

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Thread: How do red dots work?

  1. #1
    Member Array Machina's Avatar
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    How do red dots work?

    I've been wondering this for a while now.

    I know the basic red dots have 2 layers of glass, one that allows a projected LED to shine through at an angle of refraction so it reaches your eye, and a platform the led sits on to be moved for windage and what not.

    The one I have currently on my 22 looks to have a single pane, and doesn't have a large enough area for a projected red dot to work how I would reason it would. So how do these smaller red dots work?

    Maybe it's the engineer in me, but I want to know and I don't want to take it apart (yet).
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  2. #2
    Ex Member Array Ram Rod's Avatar
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    Well, I took a lot of things apart when I was younger...still do, but now it's in order to repair them. LOL! I didn't become an engineer nor can I demand the average yearly salary of an engineer.......IMO, I do better at an hourly wage to fix what they've done.
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  3. #3
    Member Array Machina's Avatar
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    Internal red dot sight - Google Patent Search

    This has a picture of what I understand of a red dot. It only think here I see is that there are multiple panes even though a red dot apparently needs only one pane of sensitized glass that reflects a very small wavelength of light that the LED produces.

    My sight has only one pane, which makes sense, however I cannot see where the projection comes from.

    EDIT: Dur, it projects from 2-3 inches before the pane, I just didn't look hard enough. If I turn the brightness up, I can get the projection to fall on my finger before it hits the pane. Didn't even need to take it apart :)

    Mystery solved! This calls for a beer.
    $cris@caferacer>wakeup.sh
    sudo apt-get install caffeine
    Password:
    Unpacking...
    Caffeine installed correctly
    $cris@caferacer>startday.sh

  4. #4
    Ex Member Array Ram Rod's Avatar
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  5. #5
    Member Array alexcantslee's Avatar
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    Now Im confused!

    So when you look through it are you seeing a dot reflected on both panes that youhave to line up. IE the two reflection are in a straight line in relation to the barrel? I hadnt given it much thought and after seeing the diagrams now I dont get it :(

    Alex!
    My other Kahr is a Kimber.

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