Symmetrical projection screen

Details Symmetrical projection screen Symmetrical projection screen

2011-01-04

2011-01-04

Mahoney, Christopher E (Department: 2862)

Optical: systems and elements

Projection screen

Roll up screen

Reexamination Certificate

active

07864421

ABSTRACT:
Disclosed herein is a symmetrical projection screen. The screen includes a front screen member and a rear screen member. The front and rear screen members are made of a hard material, such as metal, or a hard film. Between the front and rear screen members is disposed a shock-absorbing member. The shock-absorbing member is made of a soft film having physical properties and material quality different from those of the front and rear screen members, such as compressed sponge, plastic foam, or poly vinyl chloride (PVC). The front screen member and the rear screen member are arranged in a front-and-rear symmetrical structure about the shock-absorbing member. Consequently, the deformation factors, such as external pressure or the change in the weather, are extinguished or cut off by the shock-absorbing member, whereby the flatness of the screen is maintained.

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patent: 4360553 (1982-11-01), Landheer
patent: 5337179 (1994-08-01), Hodges
patent: 6291049 (2001-09-01), Kunkel et al.
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patent: 7545563 (2009-06-01), Chen
patent: 2007/0047077 (2007-03-01), Browning
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patent: WO 2004036310 (2004-04-01), None
Goo Systems “Screen Good” Product website (Archive.org <http://www.goosystems.com/index.php?cont=screen> dated Mar. 17, 2006).
Photo.net Post to topic “slide projection screen” by Rob F. dated Dec. 15, 2002.
Dumont, Katie “Picture Perfect Framing” Lark Books 2000. Relevant portions.

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