Manner null of data reading from the data logging body and this data logging

摘要

PURPOSE:To increase the secrecy of data and to prevent a forgery by irradiating the data with light through a transparent sheet for collation where fine parallel lines, orthogonal lattice lines, or a dot pattern for printing is extracted. CONSTITUTION:The recording data are made to appear with moire fringes generated by the light irradiation through the transparent sheet for collation where the fine parallel lines, orthogonal lattice lines, or dot pattern for printing is extracted. Namely, the data are recorded on a recording body with specific- pitch parallel lines, so the data never become unreadable owing to demagnetization caused by lines of magnetic force and the density and angle of the parallel lines (ground tint) are varied in several stages to record much information data on the recording body compactly and display them distinctively. Consequently, the recorded data are hard to disappear, the secrecy of the data is improved, and it becomes difficult to forge the data.