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What is this piece in a cell phone camera?

Discussion in 'General Electronics Discussion' started by Braeden Hamson, Jun 23, 2019.

  1. Braeden Hamson

    Braeden Hamson

    Feb 18, 2016
    Hey guys,

    I pulled apart a cell phone camera and found what looks like a filter but as far as I can tell doesn't act like one. But hey I can only see in visible light. This sat right above the sensor.



    [mod edited to correct images]
    Last edited by a moderator: Jun 24, 2019
  2. dave9


    Mar 5, 2017
    Probably an infrared filter
    davenn likes this.
  3. BobK


    Jan 5, 2010
    More likely UV.

    davenn likes this.
  4. davenn

    davenn Moderator

    Sep 5, 2009

    yeah, possibly that as well :)
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    CMOS sensors are sensitive to infrared light. Usually a filter is used to block IR light to ensure correct focusing and exposure in the range of visible light.
    Some older digital cameras do not have such a filter. This can easily be verified by "looking" into the emitter of any IR remore control through the camera's sensor and pressing a button on the remote control. If you can see the IR led in the camera's viewfinder, the camera is sensitive to IR.
    Next step would be to insert the unknown filter between remote control and camera and check again. If the remote control's LED is visibly dimmed, the filter is an IR filter. If there is no change (compared to the image without the additional filter) the filter is not an IR filter, possibly a UC filter then.

    BTW: For true infrared photography the filter on a modern digital camera needs to be removed.
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