Abstract: The present invention is concerned with a certification card such as ID card or the like including hologram and an optical recording portion.Hologram is such that an amplitude and a phase of light wave emitted from an object are recorded and an image of the object is rebuilt by emitting light to reproduce of an amplitude and a phase of the thus emitted light.On the other hand, optical recording technique is such that data pits are formed on an optical reflective surface of an optical recording layer and the thus formed data pits are detected by difference in optical reflectivity from the data pits when the object is lightened by laser beam so that data are read.According to the present invention a card is constituted by adhering a card front board to a card rear board, and hologram and optical recording portion are formed between the card front board and the card rear board.The such prepared certification card is difficult to be falsified and altered and therefore it has high safety.

Abstract: The invention relates to a scheme for correctly reading data pits with a reader even if an optical recording card is fed slantwise.If the optical recording card is slanted relative to a line sensor for reading the card, the line sensor may ride on two or more data pit columns. However, discriminator pits are formed at the start and end of each data pit column so that the data can be processed after deciding if the optical recording card is disposed slantwise or not.A relatively short data pit column with discriminator pits formed at the start and end thereof is used. A plurality of data pit columns are disposed with a guide bar interposed therebetween. A readout signal from the discriminator pits is used for deciding if the data pit column has been read correctly, whereas a strobe signal read from the guide bar is used for initiating a memory selector.