What is this lens for on a CD/DVD drive?

Discussion in 'General Electronics Chat' started by vindicate, Jul 26, 2012.

  1. vindicate

    Thread Starter Active Member

    Jul 9, 2009
    I have a portable USB CD/DVD burner. It's the kind that comes out and all the equipment is on the tray(like a laptop drive).

    So I left the tray open yesterday, and I turned on my computer with I plugged in, and I noticed that this lens(LED?) lit up red for most of the time the computer was booting and then shut off. Also If I unplug the drive and plug it back in it will light up for a bit. What is it...and LED or a laser? If it is a laser how dangerous was it that I was messing around looking at it, trying to figure out what it was(while on). I've attached a picture with said device circled.

    • lens.jpg
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  2. gerty

    AAC Fanatic!

    Aug 30, 2007
    Looks like the sensor that tells the player a disk has been inserted.
  3. BMorse

    AAC Fanatic!

    Sep 26, 2009
    That is just a sensor used to detect if a disc is in the drive or not, it is most likely just a visible red LED and a phototransistor pair....