Method for mass-producing eccentric Fresnel lens sheets

A method for mass-producing eccentric Fresnel lens sheets each of which does not contain an optical axis, said method comprising the steps of:

• providing a number of concentric Fresnel lens sheets, said concentric Fresnel lens sheets including a first set having a plurality of Fresnel lens sheets and a second set having a plurality of Fresnel lens sheets the number of which is less than that of the first set;
• cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the first set in such a manner that each of the first sheets does not contain a center of lens of the concentric Fresnel lens sheet;
• cutting out a plurality of second sheets, each corresponding to the other portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the second set in such a manner that each of the second sheets does not contain the center of lens of the concentric Fresnel lens sheet, wherein the number of said second sheets is larger than that of said first sheets and wherein the size of each of said first sheets is larger than the size of each of said second sheets, and
• combining each of the first sheets and each of the second sheets in such a manner that patterns of the first sheet and the second sheet are continuous to provide said eccentric Fresnel lens sheets.

A method for mass-producing eccentric Fresnel lens sheets each of which does not contain an optical axis, said method comprising the steps of:

• providing a number of concentric Fresnel lens sheets, said concentric Fresnel lens sheets including a first set having a plurality of Fresnel lens sheets and a second set having a plurality of Fresnel lens sheets the number of which is less than that of the first set;
• cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the first set in such a manner that each of the first sheets does not contain a center of lens of the concentric Fresnel lens sheet and the first sheets are of the same shape and dimension to each other;
• cutting out a plurality of second sheets, said second sheets being smaller than said first sheets, each of said second sheets corresponding to the other portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the second set in such a manner that each of the second sheets does not contain the center of lens of the concentric Fresnel lens sheet and the second sheets are of the same shape and dimension to each other, wherein the number of said second sheets is larger than that of said first sheets, and wherein the size of each of said first sheets is larger than the size of each of said second sheets;
• and
• combining each of the first sheets and each of the second sheets in such a manner that patterns of the first sheet and the second sheet are continuous to provide said Fresnel lens sheets.

A method for producing eccentric Fresnel lens sheets, said method comprising the steps of:

• providing first and second concentric Fresnel lens sheets;
• cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from the first Fresnel lens sheet;
• cutting out a plurality of second sheets each corresponding to the other portion of the eccentric Fresnel lens sheet from the second Fresnel lens sheet;
• and
• combining each of the first sheets and each of the second sheets in such a manner that patterns on the first sheet and the second sheet are continuous to provide said eccentric Fresnel lens sheets.