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US 2002/0154401 A1Published application
Fresnel lens for projection screens
Assignee3M Innovative Properties Company
InventorsDaniel W. Hennen, Robert S. Moshrefzadeh, John C. Nelson, Scott M. Tapio, Patrick A. Thomas
Life of this patent
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Abstract
The present invention is a screen, such as is used in back-lit projection screens, having a Fresnel lens laminated to another layer for support. The screen includes a Fresnel lens having an output surface, and a dispersing screen supportingly attached on a first side to the output surface of the Fresnel lens.
Claims41
A screen, comprising:
- a Fresnel lens having an output surface, at least a portion of the output surface including a Fresnel structure;
- and
- a first optical layer having a first surface supportingly attached to the output surface of the Fresnel lens.
A screen, comprising:
- a Fresnel lens having an output surface;
- and
- a dispersing screen supportingly attached on a first side to the output surface of the Fresnel lens.
A screen, comprising:
- a first layer having a first surface;
- redirecting means for redirecting light passing through the screen, having a Fresnel structured output surface;
- and
- attaching means on at least one of the first layer and the redirecting means for supportingly attaching the output surface of the redirecting means to the first surface of the first layer.
1 more element
A Fresnel lens, comprising:
- a layer of transparent material having
- an input surface and
- a Fresnel-structured output surface having ridges formed between functional slopes and riser slopes, at least some of the ridges being truncated with flat portions essentially parallel to the input surface.
A Fresnel lens, comprising:
- a layer of transparent material having an output surface with a Fresnel-structured portion proximate an edge thereof and a substantially unstructured center portion.
A Fresnel screen, comprising:
- a first layer having a first surface;
- and
- a Fresnel lens having a Fresnel-structured output surface, the Fresnel-structured output surface including functional slopes and riser slopes, at least a portion of one functional slope and a portion of a riser slope being embedded in the first surface of the first layer.
A Fresnel lens, comprising:
- an optically transmitting layer having an input surface and an output surface, at least a portion of the output surface including a Fresnel structure;
- and
- optically interacting particles disposed within the optically transmitting layer.
Dependencies are inferred from the claim text.