Old 04-02-2010, 01:20 AM #17
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Default Re: Projectors Now Available!

Sorry yes, not 455nm, 445nm

I believe they do use raster scanning, since I think the losses would be too high if you tried passing it thru something.


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Old 04-02-2010, 01:35 AM #18
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Default Re: Projectors Now Available!

The blue diode must be something similar to this: (maybe lower power)

http://www.sonic.net/~jayrob/DL-445-50-1.pdf
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Old 04-02-2010, 05:42 AM #19
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Default Re: Projectors Now Available!

Quote:
Originally Posted by Things View Post
Sorry yes, not 455nm, 445nm

I believe they do use raster scanning, since I think the losses would be too high if you tried passing it thru something.

I was actually kind of hoping they ARE passed through something.. That would mean anticipated heavy loss and some power to compensate. I really hope this is the way they do it.

Is it possible to project at that speed and fit all the hardware for galvos? I would think that they would take the approach of the existing projector technology and replace the lamp with laser. Obviously with major changes compared to an existing setup.

Besides it would be more cost effective to use non mechanical methods, and at 600$ with the usual price drop per year, I just cant see all that hardware in such a tiny package..


They are also looking to fit these in cell phones, can they even make galvos that small? Even if yes, can they make them fast enough? Even 30k is not going to produce the resolution seen in the video..


The more I think about these, the more I want one.



*Edit

Got it, just found another video. The layout looks to be 3 diodes, and a mirror called a MEM.

They show the inside and explain away.






And its not done this way


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Old 04-02-2010, 05:48 AM #20
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Default Re: Projectors Now Available!

They do look pretty awesome.

One observation that may not really matter...

Where is the laser warning sticker? If it outputs more than 5mW, where is the key interlock, safety dongle, aperture shutter, and LED indicator? And is there a 2 second delay? Is it CDRH and FDA certified?
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Old 04-02-2010, 05:56 AM #21
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Default Re: Projectors Now Available!

Jay I hope that this is the start to the actual device we are dreaming about.

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Old 04-02-2010, 06:06 AM #22
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Default Re: Projectors Now Available!

Jays got a good point. I'm just glad that those diodes are now being mass produced... kind of.
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Old 04-02-2010, 10:09 AM #23
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Default Re: Projectors Now Available!

wannaburn, they are galvo's in a way, except for having mirrors on a shaft, to keep it more compact, I think it works kinda like a CD drive pickup, a magnet on the mirror and an electromagnet below it. This would give you fast scanning speeds, and also low power consumption. If you had galvo's that could scan that fast properly, it's draw a whole heap of power!

While it would be good for US if they shine it thru something, it'd end up costing them more to produce them, because of the higher powers needed.
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Old 04-02-2010, 10:46 AM #24
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Default Re: Projectors Now Available!

Quote:
Originally Posted by jayrob View Post
The blue diode must be something similar to this: (maybe lower power)

http://www.sonic.net/~jayrob/DL-445-50-1.pdf
It might very well be, and by the looks of the video, the green is also diode based (or they simplified the dpss part out).

I suppose the whole assembly could be used to make a laser scanner as we know them: That mirror is operated as a raster scanner, but that doesnt mean it cannot be controlled like a nomal x-y galvo set. I have no idea about the interface on it, but mechanically it could be done.

Quote:
Where is the laser warning sticker? If it outputs more than 5mW, where is the key interlock, safety dongle, aperture shutter, and LED indicator?
Perhaps it has some kind of scanfail? Given the raster scanning, its not likely to expose anyone to dangerous levels of light, unless you hold it right in front of your eye.
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Old 04-02-2010, 11:36 AM #25
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Default Re: Projectors Now Available!

I said this before this unit does use directly injected blue and red diodes, the green is dpss.

I think the output power is allot more than 5mW, but as Benm said, the light is spread out over a lager area and thus is eye-safe.
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Old 04-02-2010, 04:11 PM #26
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Default Re: Projectors Now Available!

Quote:
Originally Posted by RA_pierce View Post
Where is the laser warning sticker? If it outputs more than 5mW, where is the key interlock, safety dongle, aperture shutter, and LED indicator? And is there a 2 second delay? Is it CDRH and FDA certified?
If it were modulated with a DLP chip, it would cease to be a beam, and therefore pose no danger unless you intentionally focused the output with additional optics into your eye. If it isn't DLP based, they are unlikely to show warning stickers on a catalog picture of the product. Bad marketing.
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Old 04-02-2010, 08:45 PM #27
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Default Re: Projectors Now Available!

Quote:
Originally Posted by FireMyLaser View Post
I said this before this unit does use directly injected blue and red diodes, the green is dpss.

I think the output power is allot more than 5mW, but as Benm said, the light is spread out over a lager area and thus is eye-safe.
The output stated is 20 lumen. This equates to about 80 mW of light if its ideal white (when combined), perhaps a bit less if green is relatively too powerful.
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Old 04-02-2010, 08:52 PM #28
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Default Re: Projectors Now Available!

What I dont understand is how scanning speed makes thing safer for the eye.

I burned a good size notch in my old cam's CCD while running 100mW 405nm in a scanner.

It was in close proximity to the laser, approx 10ft, but I didnt expect it. The scanner was projecting a time tunnel type cone at the time, and I had accidentally passed the camera through its solid lined path.

Come to think of it, it would have been funny if the news cam in the video had a nice patch of holes in the CCD after filming the aperture of the pico projector
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Old 04-02-2010, 08:55 PM #29
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Default Re: Projectors Now Available!

Quote:
Originally Posted by Benm View Post
The output stated is 20 lumen. This equates to about 80 mW of light if its ideal white (when combined), perhaps a bit less if green is relatively too powerful.
That would be bad if you smashed the thing in your face, but this applies to conventional projectors as well.
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Old 04-02-2010, 08:57 PM #30
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Default Re: Projectors Now Available!

so who's gonna crack one of these babies open first?

I have to admit i'm most curious about the light sources... Green and blue diodes?
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Old 04-02-2010, 09:03 PM #31
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Default Re: Projectors Now Available!

Quote:
Originally Posted by wannaburn View Post
What I dont understand is how scanning speed makes thing safer for the eye.

I burned a good size notch in my old cam's CCD while running 100mW 405nm in a scanner.

It was in close proximity to the laser, approx 10ft, but I didnt expect it. The scanner was projecting a time tunnel type cone at the time, and I had accidentally passed the camera through its solid lined path.

Come to think of it, it would have been funny if the news cam in the video had a nice patch of holes in the CCD after filming the aperture of the pico projector
I guess since it's moving, you'd need more power to burn. I guess the 100mW was too powerful either way. But if it was moving ridiculously fast (faster than scanner speed fast), it would not have burned the CCD. It's all about exposure doses.

Either way though, I don't want anything in my eye. Even regular projectors to the eye hurts.
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Old 04-02-2010, 10:06 PM #32
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Default Re: Projectors Now Available!

If you use severall pico projectors you could easely build a affordable volumetric laser display,...
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