Ring illumination device for an objective

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MichaelG.
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Ring illumination device for an objective

#1 Post by MichaelG. » Thu Dec 15, 2022 3:25 am

Someone at Zeiss put a lot of thought into this one:
https://worldwide.espacenet.com/patent/ ... S9297993B2

MichaelG.
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BramHuntingNematodes
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Re: Ring illumination device for an objective

#2 Post by BramHuntingNematodes » Thu Dec 15, 2022 6:24 am

Unitron had a similar objective with a ring of lights built in, of which I have a working example. It was called the unipak ring illuminator.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

MichaelG.
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Re: Ring illumination device for an objective

#3 Post by MichaelG. » Thu Dec 15, 2022 9:53 am

As featured here, Bram ?
http://www.emcgrath.com/catalog/images/ ... LBR248.pdf

… or did they do something else [more integrated] ?

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blekenbleu
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Re: Ring illumination device for an objective

#4 Post by blekenbleu » Thu Dec 15, 2022 2:35 pm

This expedient employs 40mm LED halo (angel eye):
Image
.. with a partial cylinder glued to its back and held to a suitable objective by an o-ring:
Image
https://blekenbleu.github.io/microscope/#RGB
Metaphot, Optiphot 1, 66; AO 10, 120, EPIStar, Cycloptic

apochronaut
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Re: Ring illumination device for an objective

#5 Post by apochronaut » Thu Dec 15, 2022 2:54 pm

A Professor Alexander Silverman, dean of the School of Chemistry, University of Pittsburgh patented a small circular objective mounted incident illuminator in the late teens. https://patents.google.com/patent/US1311186A/en .

Spencer manufactured and catalogued 2 versions it in the 1930 catalogue as the Silverman illuminator. A small Silverman illuminator for use with biological, polarizing and chemical microscopes and a large Silverman illuminator to illuminate larger objects.
There was an accessory blind that allowed for a form of unilateral oblique.

BramHuntingNematodes
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Re: Ring illumination device for an objective

#6 Post by BramHuntingNematodes » Thu Dec 15, 2022 3:56 pm

MichaelG. wrote:
Thu Dec 15, 2022 9:53 am
As featured here, Bram ?
http://www.emcgrath.com/catalog/images/ ... LBR248.pdf

… or did they do something else [more integrated] ?

MichaelG.
Yes. Although most of the objectives pictured are the usual, I believe you can see one of the special ones on page 3 of this pamphlet. The illuminator replaces the usual cowl and positions 7 individual lights very near the lens. I believe each illuminator is specially fitted to one objective only as there is a clear marking of the objective power on it.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

MichaelG.
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Re: Ring illumination device for an objective

#7 Post by MichaelG. » Thu Dec 15, 2022 5:19 pm

Thanks, Bram

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