Camera with Coaxial light

[Mike Menci]

Hello, 

I have made some COAXIAL camera housing for Open PnP with USB 1280x720 OV9732 Video Camera Module 1MP for my OpenPnP tests. 

For Lens to PCB distance = ca.50 -90mm 
I have finished my testing and I have this set for sale.  If somebody is interested please send me a PM. 
For details see enclosure.... 

Mike

[simpl...@tuta.io]

Very nice. How do the images look compared to your Keyence coaxlight?

[Mike Menci]

Good 

I wanted to inclose ZIP images but the Web does not allow them - to large size.. 

send me PM and I can send you Zip file 

Mike 

ByiPhone

Dne 25. jan. 2025 ob 18:42 je oseba simplemount via OpenPnP <ope...@googlegroups.com> zapisala:



Very nice. How do the images look compared to your Keyence coaxlight?

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[Mike Menci]

See enclosed

[Mike Menci]

two more

[simpl...@tuta.io]

thanks - see no disturbing shadows

I like it, but I'm not allowed to collect further ;-)

[Wayne Black]

Nice Mike. One of your earlier threads got me thinking about this and I ordered some cheap beam splitter cubes to play with. What is your enclosure made of?

On Sat, Jan 25, 2025 at 11:48 AM simplemount via OpenPnP <ope...@googlegroups.com> wrote:

thanks - see no disturbing shadows

I like it, but I'm not allowed to collect further ;-)

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Wayne Black

Owner

Black Box Embedded, LLC

black...@blackboxembedded.com

1.831.682.4964

[Mike Menci]

It is not a Beam Cube used - it is a half reflecting mirror you will need..... Original is Aluminium - today with you can replace it with some filament that is the heat resistant  
Mike

[Wayne Black]

Hi Mike, Yes I understand, and well done. Your design would not work in my setup as height is an issue and your assembly is too tall. What I meant to say is your design got me looking at coaxial lighting and Ive since been experimenting with cheap cube beam splitters. I think I may have found a setup that will work with my height restrictions. 

This is a very cool lighting technique I hadn't considered before. Thanks!

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[Wayne Black]

Hey Mike I did a meta search on this subject and found all the RD you have done over the years. Very cool and very helpful.

[Mike Menci]

We "Old" members need to retire soon !  Thanks  Wayne

[Wayne Black]

Hi Mike,

Did you ever experiment with coaxial arrays? It seems a big issue is fully illuminating the entire FOV. With a single coaxial light the beam splitter must be the center of the FOV. If you had quadrant array the splitters could be much small and outside of the FOV. Keeping the AOI constant and adjusting the splitter angle/orientation. Or is that just a pipe dream? Maybe you can see what I mean below.

Single Coaxial

Array Coaxial

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[Michael Anton]

This might be a dumb question, but how is an array coaxial still really coaxial?  It doesn't look that much different than a ring light, other than it appears to be bouncing the light off of a mirror (I'm not sure that would provide much benefit).  The whole point of coaxial lighting is that the light is emitted down the lens axis, so the light comes straight back into the lens.  If the light bounces off the board at an angle, you've lost the property of a coaxial light that makes it so desirable.

I get what you are trying to achieve, and I wonder if instead it could be done by lensing the LED light source so that it is more focused at the beam splitter surface, but then diverges afterwards.  That should allow it to light a larger area, if the focal length of the lens is picked appropriately.

[Wayne Black]

This might be a dumb question, but how is an array coaxial still really coaxial? 

I don't know, that's why I was asking. 

The array image I posted above is the extreme. If the array AOI was near perpendicular to the camera line of sight, yet the beam splitters out of FOV you could illuminate the entire FOV with much smaller splitters in a much smaller package. Again, this may be ridiculous in practice. Tracking Mikes many threads on this subject made me curious if he had tried it or not.

[Mike Menci]

Here you can find more info and many types of light source.... 
The advantage I see is the needed space for such vision light- it takes much lase space and the light area is only from one side of lens - not all around the lens.

[Roland Exler]

The "Array Coaxial" could not be a coaxial light per definition, as this requires the axis of the light being the same as the axis of the camera. As soon as you go sideways you will ever have a "standard" light even if you go very far. I have not tried so far, but using a ring light very close to the lens diameter you might get close to coaxial lighting.

Roland

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