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US 4,255,767 AGranted
Electronically controlled magnetic recording
AssigneeXerox Corporation
InventorThomas M. Frey
Life of this patent
Estimating the term…
Abstract
An electronically controlled magnetic recorder for rapidly optically scanning an original document at a distance and for producing a latent magnetic image thereof. An electronic interface between the optical scanner and the magnetic recording head includes optional electronic halftoning circuitry, circuitry for controlling system and subsystem timing; memory circuits; write drivers and circuitry for controlling pixel alignment.
Claims6
A magnetic image recorder for optically scanning an original document and for producing a latent magnetic image thereof comprising
- platen means for supporting a document to be recorded,
- a second rotational member having n number of magnetic recording heads thereon at a distance R from its axis of rotation corresponding to the n number of scanning means,
- a first rotational member having n number of scanning means thereon, the member being spaced from its axis of rotation to the platen means by a distance of about n times R to enable each scanning means to scan segments of a document on the platen means to generate a series of data signals representative of the optical density levels of segments on a document where n is an integer equal to or greater than two,
- first translation means for effecting relative movement between the platen means and the first rotational member in a direction generally normal to the scanned segment of a document to enable each of the n scanning means to scan adjacent, generally parallel, segments of a document,
- magnetic tape supporting means for supporting a magnetic tape adjacent the second rotational member to enable each recording head to record a series of magnetic transitions along a segment of a magnetic tape,
- second translation means for effecting relative movement between the magnetic tape supporting means and the second rotational member to enable each of the n recording heads to record on adjacent, generally parallel, segments of a magnetic tape and
- synchronous means for effecting synchronous rotation of the first and second rotational members and synchronous movement of the first and second translation means,
- buffer means including n number of storage means each coupled to a corresponding scanning means and recording head, load means for loading data signals into a sotrage means during the generation thereof at a rate of about 1/n times one revolution time period of the first rotational means and unload means for unloading data signals from a storage means to a recording head at a rate of about (n-1)/n times one revolution time period of the first rotational means.
5 more elements
A magnetic image recording process for optically scanning an original document and for producing a latent magnetic image thereof comprising
- rotating n number of magnetic recording heads about an axis of rotation at a distance about R from the axis,
- rotating n number of optical scanning elements about an axis of rotation with the axis of rotation being about n times R from a document to be recorded where n is an integer equal to or greater than two
- moving the rotating scanning elements and a document to be recorded relative to each other in the direction of the axis of rotation for the scanning elements enabling n number of generally parallel segments of a document to be scanned by the n scanning elements each revolution with each scanning element generating series of data signals representative of optical density variations along the scanned segments of a document,
- moving the rotating recording heads and a magnetic tape on which a magnetic image to be recorded relative to each other in the direction of the axis of rotation for the recording heads enabling n number of generally parallel segments of the magnetic tape to be recorded each revolution by the recording heads as a series of magnetic transitions created by reversals of current to the recording heads,
- synchronizing the rotation of the scanning elements with the rotation of the recording heads and the relative movement of the scanning means and document with the relative movement of the recording heads and magnetic tape and,
- loading the data signals from the n scanning elements into corresponding n number of storage devices during the generation of the data signals and
- unloading the data signals from the n storage devices to corresponding recording heads after the generation of data signals by a scanning element and before the completion of the balance of the revolution by the scanning element,
- whereby a magnetic image of a document is recorded on the magnetic tape.
5 more elements
Dependencies are inferred from the claim text.