| 摘要 |
A security film for preventing a glance from four directions and a manufacturing method for the same are provided to adjust the view angle from four directions by forming a square-lattice layer by laminating two louver films to make the lattice layers cross each other at 90 degrees. A security film(1) for preventing a glance from four directions has louver films(11,13) provided with a lattice layer formed in the horizontal or vertical direction. A square-lattice layer is formed by laminating two louver films while crossing the lattice layers across each other. Two louver films are laminated by an adhesive agent. Transparent films(31,33) are laminated on both outer surfaces of two louver films. A transparent reinforcing film is interposed between two louver films by an adhesive agent.
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