Patent ID: 6929185

Claim:
A method of producing a hologram, comprising steps of: preparing an elongate flat image expressing a random number linearly in a form of a bar code; preparing a hologram master of the random number in the form of a bar code, based on the prepared flat image; winding the hologram master around a surface of a drum, and applying an etching technique to prepare a drum-shaped hologram master plate formed with a micro relief corresponding to interference fringes on the surface of the drum; rotating the drum-shaped hologram master plate on a surface of a long material sheet, to repeatedly transfer the micro relief hologram master of the surface of the drum-shaped hologram master plate to the material sheet; and cutting the material sheet to which the micro relief hologram master is transferred into hologram tapes each having a specific length; and wherein, the material sheet is cut into the hologram tapes each having the length that does not exactly divide a circumferential length of the drum-shaped hologram master plate.