| 摘要 |
FIELD: information technology.SUBSTANCE: electronic book has a housing with a front wall and a rear wall; at least part of the front wall is made using an electronic ink technique; the rear wall of the housing is made from sheet strained material, the sheet strained material being made such that the boundary of its cross-section on one of the areas is in form of an element of a conic section and the boundary of its longitudinal section on one of the areas is in form of an element of a conic section, wherein said area of the boundary of the cross-section and area of the boundary of the longitudinal section are in form of different-length elements of different ellipses, hyperbolas with different values of eccentricities and focal parameters, and the area of the boundary of the cross-section and the area of the boundary of the longitudinal section cross.EFFECT: high counterfeit protection of electronic books.2 cl, 16 dwg, 12 tbl |
