| 摘要 |
PURPOSE:To simplify a device constitution, to execute the miniaturization and to execute a low cost by executing the tracking correction with an electric method and reading the data on an optical card. CONSTITUTION:Based on an inclination angle theta of a data track and a line sensor 2 on an optical card C, an inclination K on a memory composed of a line buffer to accumulate the data is K=-1/tanthetaXD (provided that D=b/a, a: picture element pitch of line sensor 2, b: distance in which the pattern of the optical card C to image-form the line sensor 2 at one scanning period on the line sensor is moved) and the number (n) of the line buffers of a necessary memory is n=int¦A/K¦+1 (provided that A is the total number of the picture elements of the line sensor 2). Thus, the data of an (n) line outputted from the line sensor 2 are read while they shift the line for ¦K¦ dots. Thus, a mechanical mechanism is eliminated and the device constitution can be simplified.
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