Registers – Coded record sensors – Particular sensor structure
Patent
1987-07-17
1990-06-05
Faber, Alan
Registers
Coded record sensors
Particular sensor structure
235456, 235470, 369119, 369 4411, G06K 710, G11B 712
Patent
active
049316281
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an optical card reproducing apparatus for reading out the data recorded on an optical card.
BACKGROUND ART
There has been developed an optical card in which an optical recording medium film is sputtered or evaporation deposited onto a card-shaped substrate and various data is recorded as a track train onto the optical recording medium film.
Namely, a laser beam modulated by a digital signal is scanned through a galvano mirror and irradiated onto the optical card, so that recording tracks are formed onto the optical recording medium film and data is written. The reflection factor of the portion in which the track was formed is changed in accordance with the recording data.
The data recorded on the optical card is read out by irradiating the light onto the track formed on the optical recording medium film of the optical card and by receiving the reflected light. Since the reflection factor of the portion in which the track was formed is changed in accordance with the recording data, the data can be reproduced from the reflected light. The data may be also read out in a manner such that a laser beam is scanned and irradiated along the track through a galvano mirror and the reflected light is detected by a photo detector or that the light from a light emitting element is irradiated onto the track and the reflected light is received line by line using a line sensor consisting of an image pickup device such as a charge coupled device (CCD) or the like.
This optical card is a recording medium of the WORM (write once, read mostly) type and data can be once written. However, the data cannot be erased and the rerecording cannot be performed.
It is a feature of the optical card that the memory capacity is remarkably larger than that of the magnetic card. Therefore, for example, the data indicative of the balance of the bank deposit, the data concerned with the medical patient's chart, or the like can be recorded on the optical card. In this manner, various kinds of services can be realized using the optical card.
Error correction codes are added to the recording data on the optical card to prevent the deterioration of the optical card and to improve the reliability. The error correction codes are applied in a sector unit basis so that the powerful error correction can be performed, wherein the sector is constituted by a plurality of tracks as one unit.
FIG. 1 shows such an optical card and an outline of an apparatus for reading out the optical data recorded on the optical card by use of a line sensor. Reference numeral 101 denotes an optical card and 102 denotes a stripe-shaped optical recording medium film of the optical card 101 (the shape of this film is not necessarily the stripe shape). Optical dot data is recorded in the recording stripe 102 along a plurality of recording tracks T. Numerals 104 and 104 indicate guide rollers to move the optical card 101 in the direction of an arrow a. A lens (cylindrical lens) 106 is arranged over the optical stripe so as to form the image of the dot data of the recording tracks T onto a line sensor 105.
Therefore, by feeding the optical card 101 in the direction of the arrow a by the guide rollers 104 and 104, the dot data of the recording tracks T, T, . . . which were image formed on the line sensor 105 consisting of a CCD or the like can be sequentially read out.
In this case, the width of the recording track T is, e.g., about 16 .mu.m. In general, the optical card 101 is fed at a pitch of, e.g., 2 .mu.m by a stepping motor (not shown), thereby sequentially reading out the dot data which was image formed on the line sensor 105 by a scan signal.
Therefore, as shown in FIG. 2A, when the arrangement direction Z of the line sensor coincides with the direction X of the recording track T, the optical data can be accurately read out from the pixel signal which was read out by the scan signal when timing marks T.sub.s written in the upper and lower portions of the recording track were detected.
However, when the accuracy of the fe
REFERENCES:
patent: 3553437 (1971-01-01), Boothroyd
patent: 3870865 (1975-03-01), Schneiderhan et al.
patent: 4179621 (1979-12-01), Crean et al.
patent: 4289957 (1981-09-01), Neyroud et al.
patent: 4298859 (1981-11-01), Feilchenfeld
patent: 4424587 (1984-01-01), Wevelsiep et al.
patent: 4523093 (1985-06-01), Neumann
patent: 4634850 (1987-01-01), Pierce et al.
patent: 4641357 (1987-02-01), Satoh
patent: 4652730 (1987-03-01), Marshall
patent: 4692603 (1987-09-01), Brass et al.
patent: 4723173 (1988-02-01), Tanioka
patent: 4742214 (1988-05-01), Kobayashi
patent: 4774400 (1988-09-01), Kimura
patent: 4777356 (1988-10-01), Toyota et al.
International Publication No. WO 85/01818 published 04/85.
Faber Alan
Sony Corporation
Weinhardt Robert A.
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