An optical device includes an array of lenses and a plurality of first and second segments disposed under the array of lenses. At a first viewing angle, the array of lenses presents a first image for viewing without presenting the second image for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses presents for viewing the second image without presenting the first image for viewing. In some examples, individual ones of the first and second segments can comprise specular reflecting, transparent, diffusely reflecting, and/or diffusely transmissive features. In some examples, individual ones of the first and second segments can comprise transparent and non-transparent regions. Some examples can incorporate more than one region producing an optical effect.

An optical device includes an array of lenses and a plurality of first and second segments disposed under the array of lenses. At a first viewing angle, the array of lenses presents a first image for viewing without presenting the second image for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses presents for viewing the second image without presenting the first image for viewing. In some examples, individual ones of the first and second segments can comprise specular reflecting, transparent, diffusely reflecting, and/or diffusely transmissive features. In some examples, individual ones of the first and second segments can comprise transparent and non-transparent regions. Some examples can incorporate more than one region producing an optical effect.

A security or identification device comprises a membrane laser structure configured to be optically pumped. The membrane laser structure comprises a flexible emission layer comprising a gain material; and one or more structures formed in or associated with the flexible emission layer and configured to provide optical feedback in the emission layer to produce a laser light output having at least one property representing an identifier.

An appreciation card including a front panel having a window formed therein that is located between the left side and the right side of the front panel and being defined by a window border. A gift card panel is disposed on the back face of the front panel below the window border. The gift card panel includes a pocket section and an attachment tab, the pocket section being connected to the window border on a first end and to the attachment tab at an opposing second end, the attachment tab being adhered to the back face of the front panel, and the pocket section being free from the back face of the front panel. The front panel and the gift card panel define a gift card slot into which a gift card may be inserted.

An appreciation card including a front panel having a window formed therein that is located between the left side and the right side of the front panel and being defined by a window border. A gift card panel is disposed on the back face of the front panel below the window border. The gift card panel includes a pocket section and an attachment tab, the pocket section being connected to the window border on a first end and to the attachment tab at an opposing second end, the attachment tab being adhered to the back face of the front panel, and the pocket section being free from the back face of the front panel. The front panel and the gift card panel define a gift card slot into which a gift card may be inserted.

A concavo-convex structure forming layer with a concavo-convex structure on one surface; and a light-reflecting layer on at least part of a surface of the concavo-convex structure. In the optical element, the concavo-convex structure forming layer includes a unit group made up of a plurality of units whose concavo-convex structures are different from each other; each of the units has a flat portion and either a plurality of convexities or a plurality of concavities, with an upper surface of each convexity or a bottom surface of each concavity being substantially parallel to a surface of the flat portion; the convexities or the concavities adjacent to each other have center-to-center distances that are not constant; the convexities or the concavities have a constant height or depth; and in the unit group, units having an identical concavo-convex structure are not arrayed at a pitch of less than 150 m.

A concavo-convex structure forming layer with a concavo-convex structure on one surface; and a light-reflecting layer on at least part of a surface of the concavo-convex structure. In the optical element, the concavo-convex structure forming layer includes a unit group made up of a plurality of units whose concavo-convex structures are different from each other; each of the units has a flat portion and either a plurality of convexities or a plurality of concavities, with an upper surface of each convexity or a bottom surface of each concavity being substantially parallel to a surface of the flat portion; the convexities or the concavities adjacent to each other have center-to-center distances that are not constant; the convexities or the concavities have a constant height or depth; and in the unit group, units having an identical concavo-convex structure are not arrayed at a pitch of less than 150 m.

Security article and method for producing a security article. The method includes microprinting on a patch an array of microimages, placing a first translucent layer over the substrate and first patch, and laminating the substrate, the patch, and the first translucent layer using a lamination tool. The resulting security product includes a microlens array is located in the first translucent layer in register with the patch such that microimages have a one-to-one correspondence with lenses of the array of microlenses, wherein when the microimage array is viewed by a viewer through the microlens array, a composite image is visible to a viewer of the security article.

Security article and method for producing a security article. The method includes microprinting on a patch an array of microimages, placing a first translucent layer over the substrate and first patch, and laminating the substrate, the patch, and the first translucent layer using a lamination tool. The resulting security product includes a microlens array is located in the first translucent layer in register with the patch such that microimages have a one-to-one correspondence with lenses of the array of microlenses, wherein when the microimage array is viewed by a viewer through the microlens array, a composite image is visible to a viewer of the security article.

A secure substrate may include a base layer and an opacity layer disposed above the base layer. An optional background layer may be disposed above the opacity layer. The secure substrate may further include an inkjet receptive layer. A first inkjet receptive layer may be disposed above the background layer, and a second inkjet layer may be disposed below the base layer. The opacity layer may include copper such as metallic copper flakes or other particles. The opacity layer may also include a binder material such as polyvinyl alcohol, and in some cases also carbon black, process black, or the like.