Data reading and/or writing apparatus for use with an optical ca

Details Data reading and/or writing apparatus for use with an optical ca Data reading and/or writing apparatus for use with an optical ca

1987-05-18

1990-04-17

Shoop, Jr., William M.

Registers

Coded record sensors

Particular sensor structure

235470, G06K 710

Patent

active

049184156

ABSTRACT:
An apparatus for reading and writing a data signal from and on an optical card including an optical head having a semiconductor laser for emitting a writing light beam, a light emitting diode for emitting a reading light beam, a first object lens for projecting the reading light spots onto the optical card, a second objective lens for projecting the reading light beam reflected by the optical beam onto a photodetector and a half mirror arranged in an optical axis of the second objecive lens, the first and second objective lens having inclined optical axes with respect to a surface of the optical card, a driving mechanism for feeding the optical card in its lengthwise direction, and a focusing control mechanism for moving the optical head in a direction normal to the surface of the optical card. The photodetector includes first and second detectors which are arranged to receive equally an image of a part of the optical card illuminated by the reading light beam only in a focused condition. By deriving a difference between the first and second detectors there is produced a focusing error in response to which the focusing control mechanism is driven to correct the focusing error.

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