Method for mass-producing eccentric Fresnel lens sheets

Details Method for mass-producing eccentric Fresnel lens sheets Method for mass-producing eccentric Fresnel lens sheets

1994-06-30

1997-11-25

Dixon, Merrick

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156250, 156260, 353 75, 353 76, 353 78, 353 38, 359443, 359448, 359454, 359457, 359459, 359741, 359742, 359743, B32B 3100

Patent

active

056907729

ABSTRACT:
A method for mass-producing eccentric Fresnel lens sheets comprising the steps of: preparing a number of concentric Fresnel lens sheets; dividing the concentric Fresnel lens sheets into a first set and a second set each including a plurality of Fresnel lens sheets; 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; 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; and bonding 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 prepare a plurality of eccentric Fresnel lens sheet. The second set can include a third set and a fourth set and a plurality of third sheets are cut out from the third set and a plurality of fourth sheets are cut out from the fourth set. The third sheets and fourth sheets are bonded to the first sheets. The first sheets are relatively large rectangular sheets and the second sheets are small rectangular sheets.

REFERENCES:
patent: 2441747 (1948-05-01), Beshgetoor
patent: 3972593 (1976-08-01), Appeldorn et al.
patent: 3982822 (1976-09-01), Condor et al.
patent: 4391495 (1983-07-01), Mazurkewitz
patent: 4439027 (1984-03-01), Shioda et al.
patent: 4482206 (1984-11-01), Van Breemen
patent: 4573121 (1986-02-01), Saigo et al.
patent: 4674836 (1987-06-01), Yates et al.

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