Resin sheet and booklet

1. A plastic sheet comprising:

a plastic layer including a first surface and a second surface on an opposite side of the plastic layer from the first surface; and

at least one cylindrical lens formed on the first surface and extending along a first axis, wherein

the plastic layer includes a print portion that is to be colored by exposure to a laser beam,

the at least one cylindrical lens comprises a plurality of first lenses,

the first lenses are located on the first surface,

the plastic sheet further includes second lenses that are cylindrical lenses, on the second surface,

the first lenses

extend along the first axis,

are arranged side by side along a second axis that intersects the first axis, and

have widths equal to one another along the second axis,

the second lenses

extend along the first axis,

are arranged side by side along the second axis, and

have widths equal to one another along the second axis,

the print portion is a first print portion,

the first print portion includes focal points of the first lenses,

the plastic layer is configured to allow a laser beam that enters the first lenses to pass through the first print portion,

the plastic layer further includes a second print portion that is to be colored by exposure to a laser beam,

the second print portion includes focal points of the second lenses,

the plastic layer is configured to allow the laser beam that enters the second lenses to pass through to the second print portion, and

the width along the second axis of the first lenses differs from the width along the second axis of the second lenses.

2. The plastic sheet according to claim 1 , wherein the plastic layer further includes, in at least part of the plastic layer between the first print portion and the second surface in a thickness direction of the plastic layer, a colored portion that has a color different from a color-changed portion that has been colored by exposure to the laser beam.

3. The plastic sheet according to claim 1 , wherein

the plurality of first lenses have different heights from one another.

4. The plastic sheet according to claim 1 , wherein the plastic layer includes, in the first print portion, a color-changed portion that has been colored by exposure to the laser beam.

5. The plastic sheet according to claim 1 , wherein

the plastic layer is made of a material that is the same as the material of the plurality of first lenses, and

the plastic layer and the plurality of first lenses are made of any material selected from a group consisting of a polycarbonate resin, a styrene acrylonitrile copolymer resin, and a cycloolefin polymer.

6. The plastic sheet according to claim 1 , wherein

the material of each of the first lenses is a plastic,

each of the first lenses has a lens pitch P that is a width along a second axis that intersects the first axis,

each of the first lenses has a height that is a lens height H,

the lens pitch P and the lens height H satisfy a relationship represented by H/P≤0.7.

7. A booklet comprising:

at least one booklet page formed of a plastic sheet; and

a fold where the booklet page is folded in a middle, wherein

the plastic sheet is the plastic sheet according to claim 1 , and

the first axis is parallel to a direction in which the fold extends.

8. A booklet comprising:

at least one booklet page formed of a plastic sheet; and

a fold where the booklet page is folded in a middle, wherein

the plastic sheet is the plastic sheet according to claim 1 , and

the first axis intersects a direction in which the fold extends.