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Making an endoscope

Discussion in 'Electronic Repair' started by N Cook, May 3, 2007.

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  1. N Cook

    N Cook Guest

    I had a go today but failed , any ideas? A violinist, I know, asked about
    such an inspection viewer, small and flexible.
    My attempt started with a clump of plastic optical fibres from one of those
    lamps with a rotating colour wheel and epoxyied into a lump on the lamp end.
    And a dome cut from the top of a clear lens LED. Both ground down , finer
    grit, until toothpaste on paper. LED , as a fish-eye lens, sort of focused
    the sun at about 5mm so focal length 5mm. Tried fixing lens 5mm and then
    10mm from the ground fibres surface and blanked off remaining area.
    The other free ends of the fibres grouped as they came so not fully 1:1
    mapping but no change of image viewing when moving over a black and white
    grid. Any ideas , or a total waste of time. The fibres are coarse 10 thou
    diameter , but just giving it a go.
     
  2. I had a go today but failed , any ideas? A violinist, I know, asked about
    Suggest you cross-post to the wider s.e.* groups. Might get better response
    from the engineering population...

    Good luck,
     
  3. No, not cross-post. He shouldn't have posted a non-repair question in
    a repair newsgroup.

    Before he posts again, he should read Mark Zenier's guide to the hierarchy,
    ftp://ftp.eskimo.com/u/m/mzenier/seguide9706.txt
    and then determine the most appropriate newsgroup before he posts again.

    There is virtually no reason for someone to cross-post. It's usually
    laziness.

    Michael
     
  4. GregS

    GregS Guest

    I was doing some work here with fibers. I was going to make some couplers for
    LEDs. Still in the works. I got something like 50 feet of bundled fibers. They
    were just floating so i could do anything i wanted. By epoxying the ends, then finely polishing
    the ends, I could get good light transfer, but far from optimum. The process needs
    tweaked by be. I also had an assembly made, and the polishing is so much better
    than by me. These assemblies have the fibers in not perfect order I'm sure it takes special
    layout to be able to keep an image intact. First you need good terminated ends, good lens
    conversion, then, good continuity.

    greg
     
  5. Ron(UK)

    Ron(UK) Guest


    You could buy one of these if you had enough work to justify one.
    http://www.dartsystems.co.uk/shop/product_info.php?products_id=175

    How about something using a miniature camera innards mounted on a mini
    gooseneck if it doesn`t have to be steerable?

    Ron(UK)
     
  6. Ron(UK)

    Ron(UK) Guest

    I`m presuming that it`s needed to inspect the positioning of the violins
    tone post?

    Ron(UK)
     
  7. N Cook

    N Cook Guest

    How small ? without going into 007 territory, do you reckon the lens plus
    CCD is (assuming this is separatable and can be extended) for a standard
    webcam or CCTV camera.
    I did do similar, ages ago, to make a printing microfiche viewer by
    extending a standard fax CCD out to under an illuminated fiche viewer
     
  8. Gary Tait

    Gary Tait Guest

    Finer fibres maybe. Perhaps even glass ones, not plastic.
    Plus better coating to keep them from cross interfering.
     
  9. Ron(UK)

    Ron(UK) Guest

    I have a colour camera and lens which the pcb is less than half an inch
    across, possibly just small enough to poke through the f hole of a
    violin. The lens screws in and out for focusing, and can get pretty
    close up, you'd need a strong light source as well, probably a hi
    brightness led would do it.

    How do professional violin repairers do it?

    Ron(UK)
     
  10. GregS

    GregS Guest

    I thought myself that plastic would work. I bought a roll of fishing line to experiment.
    it does not work at all. Glass or other materials are needed. Also bought some really good
    fiber, but it was so expensive I could not get enough coverage. The better fibers are
    individually coated. I looked through some light source assemblies, but the fibers don't always form
    a correct pattern. You can buy these relatively cheaply, but they are not ideal.

    greg
     
  11. Nonetheless, his question is valid and broadening one's experiences can't
    hurt. :)

    A totally optical endoscope uses what's called a "coherent optical bundle".
    This has 100s of thousands of fibers arranged in exactly the same pattern
    at both ends. That's why they cost 10s of thousands of dollars.

    Google: "coherent optical bundle" or something like that. Or, "endoscope"
    for that matter. :)

    Many newer ones use miniature CCD cameras.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  12. Inspecting the sound post would be one reason, though I guess it could also
    be to inspect for internal damage.

    Not sure how much better that would be than a small 45 degree mirror though.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  13. Try a place that sells auto repair tools or mechanics tools.
     
  14. Tim

    Tim Guest

    Ya know, I bought a spy camera on E-Bay for about 100 bucks CDN. It is
    about the size of pezio buzzer, and runs off a 9V battery. It is also
    wireless. I was going to put it in a bottle attached to a kite to take
    aerial shots at the beach I go to, and then I was going to mount it in
    my model train engine, for a forward view.

    Check out E-Bay, they are probably still selling them...

    - Tim -
     
  15. Tim

    Tim Guest

    Ya know, I bought a spy camera on E-Bay for about 100 bucks CDN. It is
    about the size of piezo buzzer, and runs off a 9V battery. It is also
    wireless. I was going to put it in a bottle attached to a kite to take
    aerial shots at the beach I go to, and then I was going to mount it in
    my model train engine, for a forward view.

    Check out E-Bay, they are probably still selling them...

    - Tim -
     
  16. Ron(UK)

    Ron(UK) Guest

    From my vcr repairing days (remember those?) I still have a dentists
    mirror taped to a pen light. I guess you you easily mount a small bullet
    camera to look at the mirror in the same way or modify some small
    optical toy or device.

    Ron(UK)
     
  17. What keywords were in your auction title?
     
  18. Like this one?

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200103385953
     
  19. Tim

    Tim Guest

  20. There are some cheap endoscopes on E-Bay US for about $130 USD from a
    seller in Tokyo:


    HandyScope 351L Tool Endoscope - Borescope - Fiberscope
    http://myworld.ebay.com/ebaymotors/tanboman/













    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
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