Accordion or honeycomb blinds
Accordion blinds are connected to horizontal slats 1 inch wide or more; the honeycomb style has two or more such layers connected. Both are available in non-woven fabrics in various colors and thicknesses.

Roll-up blinds
Natural-fiber reeds from grasses or bamboo, or synthetics like vinyl, are laid horizontally and woven together to produce a semi-transparent blind that rolls up from the bottom. They are inexpensive sun-blockers on a porch or in a sunroom.

This is the the unit in which the blinds are stored when rolled up and as specified from your piece, can be designed so as not to be visible from outside.

The following will provide a picture of the "caja de persiana" Spanish translation

http://diccionario.coag.es/glosario.php?lingua=castel�n&letra=...

Below is the search for valance you where you can see it is the same thing. Hope this helps

http://images.google.ie/images?hl=en&safe=off&q=blinds valan...

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Note added at 32 mins (2006-01-30 20:28:28 GMT)
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Motorized Vertical Blinds - Tip Of The Week #59 from Designer Blinds
The entire unit is concealed by a standard vertical blind valance. For tracks as wide as 16 feet with fabric, vinyl, or inserted vanes. ...
www.designerblinds.com/CSTips/CSTips_059.htm - 16k

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Note added at 1 hr (2006-01-30 21:13:22 GMT)
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for persianas de librillo I would go for
"folding blinds" or "pleated blinds".

Sorry forgot to add that the first time.

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Note added at 1 hr (2006-01-30 21:23:39 GMT)
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Just found more information:

From looking at the picture of persianas de librillo, this is often simply called a vertical blind or a vertical sliding blind where adjustable. Sliding blind seems to fit in with the librillo mechanism in this case. See link:

http://tatamiroom.com/cgi-local/catalog.pl?category=SLIDING_...

see ref

See pictures at:
http://www2.paginasamarillas.es/sites/069/067/604/001/langua...

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Note added at 2 hrs (2006-01-30 22:30:55 GMT)
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The pictures show them with legends **in Spanish**. I guess the idea is that they open like a book. They can be internal or external.

Shutters have "casing," although it's not entirely clear to me how the casing would work in your case.

You can install the shutters within the window frame (called an inside mount), or **on hanging strips installed on the window** casing or wall (called an ...
doityourself.com/windows/ installinteriorwindowshutters.htm


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Note added at 2 hrs (2006-01-30 22:38:27 GMT)
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Persianas “de librillo” o segunda ventana. Pueden ser de madera, PVC o aluminio dependiendo del tipo de construcción a la que estén destinadas. Son similares a una ventana que, en lugar de cristal, **tiene una serie de lamas móviles o fijas adosadas a los extremos del marco**. Sirven más como elemento decorativo que como elemento de insonorización o aislamiento.
http://www.mundogar.com/ideas/ficha.asp?FN=3&ID=14890

See another picture at: http://www.proyectosintermundia.com/data/otros2.html


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Note added at 3 hrs (2006-01-30 23:43:35 GMT)
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I'm encouraged by the comment from idoia_e. But I've looked for some way to further specify the book-style shutters. Indoors, it's no problem: they are called "plantation shutters." Outdoors, the best I can find is "Bahama shutters" or "Colonial shutters," which are American terms.

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Note added at 3 hrs (2006-01-30 23:55:55 GMT)
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Oops! The Bahama shutters are attached at the top. So the only possibility I could find is "colonial shutters." The fact is, we usually use "shutters" unspecified. So for your text, assuming they are outdoors, I would say "ordinary exterior shutters or rollable shutters, with the case facing the inside" If the shutters were indoors, it would be "rollable blinds or plantation shutters," but then the case part wouldn't make sense.

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Note added at 12 hrs (2006-01-31 08:35:14 GMT)
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Bottom line: In the U.S., we say "shutters" for exterior shutters and "plantation shutters" for interior shutters. All interior/plantation shutters are the "librillo" style; exterior shutters can be "librillo" or the rolling style, but the rolling style is rare in the U.S., so "shutters" for us is understood to be the exterior "librillo" style.