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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Making an endoscope
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. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#2
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Making an endoscope
I had a go today but failed , any ideas? A violinist, I know, asked about
such an inspection viewer, small and flexible. Suggest you cross-post to the wider s.e.* groups. Might get better response from the engineering population... Good luck, -- Al, the usual |
#3
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Making an endoscope
Usual Suspect ) writes:
I had a go today but failed , any ideas? A violinist, I know, asked about such an inspection viewer, small and flexible. Suggest you cross-post to the wider s.e.* groups. Might get better response from the engineering population... 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
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Making an endoscope
In article , "N Cook" wrote:
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. 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
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Making an endoscope
N Cook wrote:
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. You could buy one of these if you had enough work to justify one. http://www.dartsystems.co.uk/shop/pr...roducts_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
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Making an endoscope
Ron(UK) wrote:
How about something using a miniature camera innards mounted on a mini gooseneck if it doesn`t have to be steerable? I`m presuming that it`s needed to inspect the positioning of the violins tone post? Ron(UK) |
#7
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Making an endoscope
Ron(UK) wrote in message
... N Cook wrote: 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. You could buy one of these if you had enough work to justify one. http://www.dartsystems.co.uk/shop/pr...roducts_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) 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 -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#8
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Making an endoscope
"N Cook" wrote in :
Any ideas Finer fibres maybe. Perhaps even glass ones, not plastic. Plus better coating to keep them from cross interfering. |
#9
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Making an endoscope
N Cook wrote:
Ron(UK) wrote in message ... N Cook wrote: 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. You could buy one of these if you had enough work to justify one. http://www.dartsystems.co.uk/shop/pr...roducts_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) 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 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
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Making an endoscope
In article , Gary Tait wrote:
"N Cook" wrote in : Any ideas Finer fibres maybe. Perhaps even glass ones, not plastic. Plus better coating to keep them from cross interfering. 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 |
#12
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Making an endoscope
"Ron(UK)" writes:
Ron(UK) wrote: How about something using a miniature camera innards mounted on a mini gooseneck if it doesn`t have to be steerable? I`m presuming that it`s needed to inspect the positioning of the violins tone post? 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
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Making an endoscope
"N Cook" wrote in message ... I had a go today but failed , any ideas? A violinist, I know, asked about such an inspection viewer, small and flexible. Try a place that sells auto repair tools or mechanics tools. |
#14
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Making an endoscope
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#16
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Making an endoscope
Sam Goldwasser wrote:
"Ron(UK)" writes: Ron(UK) wrote: How about something using a miniature camera innards mounted on a mini gooseneck if it doesn`t have to be steerable? I`m presuming that it`s needed to inspect the positioning of the violins tone post? 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. 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
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Making an endoscope
"Tim" wrote in message
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... What keywords were in your auction title? -- Reply in group, but if emailing add another zero, and remove the last word. |
#18
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Making an endoscope
"Tim" wrote in message
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... Like this one? http://cgi.ebay.com/ws/eBayISAPI.dll...m=200103385953 -- Reply in group, but if emailing add another zero, and remove the last word. |
#19
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Making an endoscope
In article ,
lid says... "Tim" wrote in message 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... Like this one? http://cgi.ebay.com/ws/eBayISAPI.dll...m=200103385953 No, mine was much smaller than that. More like these ones; http://cgi.ebay.ca/Twin-Wireless-Pin...Spy-Nanny-Cam- CCTV_W0QQitemZ110122427509QQihZ001QQcategoryZ48632 QQrdZ1QQcmdZViewItem I see they are much cheaper now, and this particular auction is for a 2 camera setup. My seller was Chai Po Ying. His email was in May of 2002 anyways - Tim - |
#20
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Making an endoscope
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/ N Cook wrote: 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. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ -- 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 |
#21
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Making an endoscope
"Ron(UK)" wrote in
: How do professional violin repairers do it? Ron(UK) A dentist's mirror. |
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