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US 12,631,796 B2Granted
Optical sheet and method of manufacturing the same
AssigneeDai Nippon Printing Co., Ltd.
InventorTsuyoshi Kashiwagi
Life of this patent
Estimating the term…
Abstract
An optical sheet 1 includes an optical function film 10 and protection films 20. The optical function film 10 includes an optical function layer 11. The optical function layer 11 includes optical-element portions that are of two or more different kinds and are arrayed in one direction. The protection films 20 each include a protection layer 21 and an adhesive layer 22. The protection films 20 are peelably provided on a pair of major surfaces of the optical function film with the adhesive layer 22. The protection films 20 extend externally beyond at least a part of the periphery of the optical function film 10. In the protection films, a portion that is beyond at least the part of the periphery of the optical function film 10 includes a portion of the adhesive layer 22.
Claims13
An optical sheet comprising:
- an optical function film including an optical function layer, the optical function layer including optical-element portions that are of two or more different kinds and are arrayed in one direction;
- and
- a protection film including a protection layer and an adhesive layer, the protection film being peelably provided on at least one of a pair of major surfaces of the optical function film with the adhesive layer,
- wherein the protection film extends externally beyond at least a part of a periphery of the optical function film within a range between 1 mm and 100 mm, inclusive,
- wherein the protection film includes a pair of protection films that are respectively provided on the pair of major surfaces of the optical function film,
- wherein, in each of the pair of protection films, a portion that is beyond at least the part of the periphery of the optical function film includes a portion of the adhesive layer,
- wherein a periphery of one of the pair of protection films and a periphery of another of the pair of protection films are peelably joined to each other, and
- wherein a gap surrounded by the peripheries of the pair of protection films and the optical function film is provided, and the adhesive layer is exposed in the gap.
5 more elements
A method of manufacturing an optical sheet, comprising:
- a step of preparing an optical function film including an optical function layer, the optical function layer including optical-element portions that are of two or more different kinds and are arrayed in one direction;
- a step of preparing a first protection film and a second protection film, each including a protection layer and an adhesive layer;
- and
- a step of peelably attaching the first protection film to one of a pair of major surfaces of the optical function film with the adhesive layer, and peelably attaching the second protection film to another of the pair of major surfaces of the optical function film with the adhesive layer,
- wherein each protection film is attached such that each protection film extends externally beyond at least a part of a periphery of the optical function film,
- wherein, in each protection film, a portion that is beyond at least the part of the periphery of the optical function film includes a portion of the adhesive layer, and a periphery of the first protection film and a periphery of the second protection film are peelably joined to each other such that a gap surrounded by the peripheries of the pair of protection films and the optical function film is provided and the adhesive layer is exposed in the gap,
- wherein the step of preparing the optical function film is performed by cutting the optical function film from a multilayer sheet including the optical function layer, such that the optical function film has a quadrangular shape,
- wherein the optical-element portions each extend linearly in a direction that is different from the one direction, and
- wherein the optical function film is cut from the multilayer sheet such that the quadrangular shape of the optical function film is defined by a pair of first sides that are parallel to each other and a pair of second sides that are parallel to each other, and such that the direction that is different from the one direction is not parallel with respect to the first sides or with respect to the second sides.
6 more elements
A method of manufacturing an optical sheet, comprising:
- a step of making a multilayer sheet in which an optical function layer and an initial protection layer are stacked, the optical function layer including optical-element portions that are of two or more different kinds and are arrayed in one direction;
- a step of cutting an optical function film from the multilayer sheet, the optical function film including the optical function layer and the initial protection layer;
- a step of preparing a first protection film and a second protection film, each including a protection layer and an adhesive layer;
- and
- a step of peelably attaching, after the initial protection layer is removed, the protection film to at least one of a pair of major surfaces of the optical function film with the adhesive layer,
- wherein each protection film is attached such that each protection film extends externally beyond at least a part of a periphery of the optical function film within a range of 1 mm to 100 mm, inclusive, and
- wherein, in each protection film, a portion that is beyond at least the part of the periphery of the optical function film includes a portion of the adhesive layer, and a periphery of the first protection film and a periphery of the second protection film are peelably jointed to each other such that a gap surrounded by the peripheries of the pair of protection films and the optical function film is provided and the adhesive layer is exposed in the gap.
4 more elements
Dependencies are inferred from the claim text.