[Tryg]

Sony's Dynamic Iris

http://www.cousinsvideo.com/images/sony-iris.jpg



Sony's dynamic iris can block more light, but also more heat. Will this method be compatible with higher lumen projectors?


Sony's is only 800 lumens.

Will we need seperate heat sinks or cooling devices for this iris at higher lumens?



I think Panasonic's Iris system may be better for higher lumens as they have already implemented it into a 7000 lumen model

http://matsushita.co.jp/corp/news/of...040902-1-2.gif

http://matsushita.co.jp/corp/news/of...040902-1-3.gif

http://matsushita.co.jp/corp/news/of...040902-1-4.gif

 

[colofan]

Actually the better method for a dynamic iris would be to use pockel cells which you could configure into a electronic controlled iris. The pattern could be rectangular if edge diffraction could be managed.


Pockel cells are devices that are used as optical switches but could be configured to do this process.

 

[noah katz]

If the iris blades are metal I don't see a problem. They could fan cool it as well, transfer cooling capacity from wherever it used to be for that wattage to the iris.


I wonder if the picture is accurate, or are the iris blades black like you'd think they ougt to be to minimize scattered light. But maybe then they'd get too hot

 

[TheFerret]

They just need to implement passive cooling a la Qualia.


EDIT: BTW, what makes you think, Tryg, there is a cooling issue that is the cause for limiting the Lumen output?

 

[Brandon B]

There are dousers using this design on professional lighting fixtures in the thousands of watts. I don't think the light coming from a little PJ lamp is going to be a problem.


BB

 

[ay221]

Is the Sony 800 lumens or 1200?

 

[W.Mayer]

i think the adaptive iris will be a standard feature

in 1 or 2 years for most pr.

when you can hit 4500:1 with lcd you may can get close to 10000:1 with

dlp or lcos.

if sony is not stupid the will implement the iris also to there

new 4 k 10000 ansi pr. but as tryg sad its very difficult because of the heat from the

two 2000w xenon lamps.

but i think that that is possible.

when we will see the first dlp with this feature?

 

[Ohlson]

W.Mayer

Panasonic has some kind of dynamic iris in their laterst three chip dlp units. Perhaps it is similar to what is in ae700.

I was also thinking about how an iris would work with something like Qualia. On Qualia the cr changes as you change the iris setting. Could this cause a problem. I mean for a lcd the cr should remain the same and only the lumens change.

 

[spamboy]

The Mits hc900 has a dynamic iris

 

[TheFerret]

Quote:

Originally posted by spamboy The Mits hc900 has a dynamic iris

You know, it would be nice to have some Mits-sourced evidence of this. I could not find the HC900U on their website (only lists the HC3 and HC2000), let alone anything in their news release about iris, dynamic or otherwise.

 

[Ohlson]

The source is Projectorcentral and the Cedia summary. In the hc900 pdf there is a picture of the iris.

 

[TheFerret]

Mattias, do you have a link to that PDF?

 

[Ohlson]

 http://www.projectorpoint.co.uk/pdf/...ishi/hc900.pdf


edit: try
http://www.bdt.co.nz/projectors/data/brochure/hc900.pdf

 

[Steve Goff]

Quote:

Originally posted by Ohlson http://www.projectorpoint.co.uk/pdf/...ishi/hc900.pdf

Your link doesn't work, though there is information on that site about the Mits projector.

 

[TheFerret]

Quote:

Originally posted by Steve Goff Your link doesn't work, though there is information on that site about the Mits projector.

Here

 

[HoustonHoyaFan]

Quote:

Originally posted by spamboy The Mits hc900 has a dynamic iris

The mits appears to have a motorized lens iris, similar to the Sharp 12k. The HS51 and panny have dynamic lamp irises which varies light hitting the panels based on scene content. One way to explain the difference is the lamp irises can close down almost fully. The lens irises can close only to the boundry of the projected image!

 

[noah katz]

"On Qualia the cr changes as you change the iris setting. Could this cause a problem"


I think it causes a solution If closing the itis increases CR, then it simply doesn't need to close as much for the same effect.


"The lens irises can close only to the boundry of the projected image!"


This is the first time I've heard them called lens iris'. I think what you described is called an aperture stop.


In any case, the iris can be put at a place in the optical path, I think it's called a pupil, where closing it down dims the image evenly at the focal plane.

 

[HoustonHoyaFan]

Noah

I am sorry I do not know the formal name for the two types of irises currently used in front projectors..

The older type has an iris typically in the lens. Pj of this type include Sharp 12k, Marantz S3, Sony Hs20, and the optional "high contrast" lens sold in the commercial dlp market. I call those lens irises.

The newer type, in the HS51, panny 700, and panny 7700?, is a dynamic iris situated between the lamp and the panels. I call those lamp irises.


Let me know the correct terms.

 

[noah katz]

Actually, your description makes sense now, thanks.

 

[TheFerret]

When the first chatter about synamic irii came to AVS I immediately thought a powered, active leaf-based aperture like what is in my 35mm cameras. I did not realize that Sony was placing it on the other side of the optical block, nor Panasonic using somethnig altogether different.


Noah, the links that you posted and re-referred me to about MLA is interesting in that according to Epson the resuling conditions seems to 'shrink' the grid that makes up the SDE. This is how I interpreted Epsons diagrams.