Yes, you have. But your description is still incomplete. For example, what is the source of the image and what is its size?

To calculate the lenses required, you need to know that information to calculate the projection ratio. Basically, as I understand your problem, you need to project an image of unknown size onto a “screen” of about 0.1” at a distance of 3.28’.

I estimated the screen size at approximately the size of your pupil on your eye. That’s a tiny screen and misalignment of 1 tenth of an inch would not allow the image to be seen. Your viewer must have a very steady head.

Theoretically, perhaps an holographic image might be better, as it’s visible over a broad range of viewing angles. But your “screen” still would have to be small in order to prevent nearby people to see it. Maybe you could get away with 1”… But I am not familiar with holography.

yes yes thank you for your valuable answer in fact I had to list them tomorrow, then I also thought about this and it is obvious that the size of the source screen must be about 1 cm and as a source I am unsure whether to use a smartphone or a mini-projector also because, with smartphones are viewers, the only difficulty is to keep the beam tight and increase the brightness as well as focus. then I repeat, I already keep sure that the head does not move, this is not a problem. For holograms there is no problem, there are technologies called displair or holovect that allow me to create a holgram but I will do this by myself. Now it matters to me to finish the project of the projector as soon as possible. So I repeat either smartphone or projector as the source changes little, the problem is the lenses, please help me choose the right ones, so we finish the thread because I'm really tired

 

That is the statue I mentioned already.

yes yes it does not matter I take into consideration that the head is still this is not the problem

 

I'm also okay with the projection that you see a little blurry or not legible, it doesn't matter, but at least you see something, I'm happy with that too, but at least you see something

 

So I repeat either smartphone or projector as the source changes little, the problem is the lenses, please help me choose the right ones,

There must be some type of language translation problem. You keep using the word "projection", and that is like you project something to a screen or other flat surface, like at the movie theater. But you also keep bringing up putting an image into the eye. That is not near as easy as you seem to think it is. Lenses aren't going to do that. Lenses take an image and either magnify or or make the thing look farther away, like looking through binoculars backward.

Now you say -

I'm also okay with the projection that you see a little blurry or not legible, it doesn't matter, but at least you see something, I'm happy with that too, but at least you see something

If you only want something that can be seen, why not just use a light bulb or LED?

 

There must be some type of language translation problem. You keep using the word "projection", and that is like you project something to a screen or other flat surface, like at the movie theater. But you also keep bringing up putting an image into the eye. That is not near as easy as you seem to think it is. Lenses aren't going to do that. Lenses take an image and either magnify or or make the thing look farther away, like looking through binoculars backward.

Now you say -

If you only want something that can be seen, why not just use a light bulb or LED?

thanks for the answer then I use the word projection because bob advised me to use the front projection in which a projector makes the image reflect on a reflective surface and then be seen by the eye, if instead I use a smartphone as a source this problem does not exists. So it needs a lot of light so I think I can also use the rear projection, with an adjustable bulb with a source that illuminates a tape and then sends everything to the eyes, but I don't know how to do this, even if today's projectors make a lot of light I don't know if can do to the case you tell me. if in this case I used a projector I would have to shrink the image with the lenses and then make it reflect, you tell me, however as far as the light is concerned, it is enough for me that the projector can almost dazzle the eyes on a sunny day at a distance of 1 meter

 

the possible solutions are 2-3, but you can tell me the right one considering the fact that I need a lot of light and that obviously the projected image must reach the eyes and occupy the entire field of view, in the sense that little of what there is to be seen environment

 

obviously the projected image must reach the eyes and occupy the entire field of view, in the sense that little of what there is to be seen environment

Again it is a guessing game. You never say what this image is. Is it like a movie? Is it a page of writing? Is it an art work? All of these things have a different problem.

Back when photos were sometimes made to be projected, using slides, they had these, to preview a slide show.. I see they are still available - https://www.google.com/search?client=firefox-b-1-d&q=slide+viewer

 

Again it is a guessing game. You never say what this image is. Is it like a movie? Is it a page of writing? Is it an art work? All of these things have a different problem.

Back when photos were sometimes made to be projected, using slides, they had these, to preview a slide show.. I see they are still available - https://www.google.com/search?client=firefox-b-1-d&q=slide+viewer

short videos of a few seconds, the slides you indicated in the link were my first choice because it allows me to have the rear projection and to have a lot of light, but I don't know how to make the tapes for the slides, instead with a projector or smartphone it's easier

 

Basically, the question you are asking is related to optics, not electronics. Many responses here are from people expert in electronics but not necessarily optics. You should be looking at sites that cover optics for your answer. Like the link I provided earlier.

Search for optics, lenses, telescopes, microscopes, projectors. Most solutions will be for enlarging an image; you want to make an image smaller. But just reverse the math and you might find the solution you are looking for.

 

Basically, the question you are asking is related to optics, not electronics. Many responses here are from people expert in electronics but not necessarily optics. You should be looking at sites that cover optics for your answer. Like the link I provided earlier.

Search for optics, lenses, telescopes, microscopes, projectors. Most solutions will be for enlarging an image; you want to make an image smaller. But just reverse the math and you might find the solution you are looking for.

yes, however, finding optics experts on the web is difficult, also because what I am asking does not seem so difficult, they are only a few lenses, also because I believe that you too are prepared in optics because you have studied physics. anyway I in my city ask for help from opticians, maybe you could recommend me some internet site or forum on the web that can help me?

 

Basically, the question you are asking is related to optics, not electronics. Many responses here are from people expert in electronics but not necessarily optics. You should be looking at sites that cover optics for your answer. Like the link I provided earlier.

Search for optics, lenses, telescopes, microscopes, projectors. Most solutions will be for enlarging an image; you want to make an image smaller. But just reverse the math and you might find the solution you are looking for.

@djsfantasi I can't find the link you say you recommended to help me find the lenses

 

yes, however, finding optics experts on the web is difficult, also because what I am asking does not seem so difficult, they are only a few lenses, also because I believe that you too are prepared in optics because you have studied physics. anyway I in my city ask for help from opticians, maybe you could recommend me some internet site or forum on the web that can help me?

Sorry Tryii…While I have studied physics, it was 50 years ago. I have forgotten more than I remember.

Yes, it may be hard, but you have to try. The problem is a simple high school science project. So the answer is out there.

Search for designing telescopes, microscopes, projectors!

Edmund Scientific is a company that I knew used to sell lenses. Their catalog is a treasure trove of information. But it seems to have closed and split off it’s optics division. Perhaps this link will help.

 

Sorry Tryii…While I have studied physics, it was 50 years ago. I have forgotten more than I remember.

Yes, it may be hard, but you have to try. The problem is a simple high school science project. So the answer is out there.

Search for designing telescopes, microscopes, projectors!

Edmund Scientific is a company that I knew used to sell lenses. Their catalog is a treasure trove of information. But it seems to have closed and split off it’s optics division. Perhaps this link will help.

ok thank you very much, you are kind as always, i will try the link you suggested, however i inquired and the lenses that narrow the beam are the converging lenses

 

@BobTPH @shortbus @djsfantasi @MisterBill2 one last question, as a projector, which one do you recommend? it must be small but powerful

 

Search for optics, lenses, telescopes, microscopes, projectors. Most solutions will be for enlarging an image; you want to make an image smaller. But just reverse the math and you might find the solution you are looking for.

Just my point of view(pun intended), Have you held a gun scope or binoculars away from your eyes at any distance more than an inch or so? A gun scope works because it is using that ocular lense as a projection screen of sorts. All of the other lenses work in conjunction with it. Hold it out at the TS 1 meter and you will see very little or anything at all. Those slid viewers work because of the frosted screen the lenses are projecting on, not directly into the eye.

 

@Tryui Look at these -
https://community.wolfram.com/content?curTag=optics

https://www.physicsforums.com/forums/optics.300/

 

I tried putting a standard binocular with the eyepiece pointing at my phone screen and held 1m away. I could see a circle of text big enough to hold about 6 or 7 characters through the objective lens. The image was fully contained in the objective lens, maybe 50 mm across. And it moves oddly as I move my head, allowing viewing from only a small angle. So it works as you want, but is too small and very hard to keep the image in view and stable. I doubt that it would serve your purposes.

 

Just my point of view(pun intended), Have you held a gun scope or binoculars away from your eyes at any distance more than an inch or so? A gun scope works because it is using that ocular lense as a projection screen of sorts. All of the other lenses work in conjunction with it. Hold it out at the TS 1 meter and you will see very little or anything at all. Those slid viewers work because of the frosted screen the lenses are projecting on, not directly into the eye.

thanks for the answer but I did not understand the last part, which are the sliding visors with frosted lenses and if they have to do with the subject

 

I tried putting a standard binocular with the eyepiece pointing at my phone screen and held 1m away. I could see a circle of text big enough to hold about 6 or 7 characters through the objective lens. The image was fully contained in the objective lens, maybe 50 mm across. And it moves oddly as I move my head, allowing viewing from only a small angle. So it works as you want, but is too small and very hard to keep the image in view and stable. I doubt that it would serve your purposes.

yes yes it's the same experiment that I did, even I see peaks of one meter characters, so maybe we didn't think that those images of the experiment are made to be seen without anything, but I believe that if there is a projector that can concentrate the images and a larger eyepiece, such as the lenses of smart glasses, maybe we could get closer, however my last question is, where can I buy such a small but powerful projector, similar to that of smart glasses?

 

There is no projector. What google glass has is a small video screen with a lens that allows you to focus on it at that short distance. Doing so a meter away is an entirely different problem, which may be undoable. I don’t know enough about optics to say for sure.