Datacopy Corporation

Armin Miller

Lauren V Merritt

Charles A Lindberg

Maxwell G Maginness

A playback head (155) is moved across a recording medium (151) orthogonally to a data track by playback head-moving means (157, 159, and 161), said data track being independently moved so that previously-recorded data is sequentially recovered. An electrical signal, which bears a direct relationship to the velocity of the head-moving means, is produced by a position sensor affixed to the head-moving means and a differentiator (169). Said signal is used to close a velocity loop, through a summing junction (171) and a power amplifier (173), around the head-moving means. The playback head is moved in addition, at a relatively high frequency, by dithering means which causes an amount of head motion that is small with respect to the width of the data track. The dither motion causes an amplitude modulation of the signal being recovered from the data track by the playback head. The amplitude modulation contains information on the instantaneous position of the playback head with respect to the center line of the data track. This instantaneous position information is recovered through the use of an amplitude detector (177), a bandpass filter (45), a synchronous rectifier or a pair of sample-and-holds controlled by the dither frequency, and a second filter (49), the result being a steering signal that is applied to the summing junction. The end result is that the playback head stays substantially on the center line of the data track regardless of disturbances to this alignment.

Method and apparatus for following a recorded data track with a read head

A high-resolution, electronic camera with real-time storage capability. The image at the focal plane of a lens (5) is electronically scanned in one direction by a linear photodiode array (1), and in the orthogonal direction by a carriage (3), motor (17), and leadscrew (13) subassembly which mechanically moves the array with respect to the lens. The motion of the array is directly translated into comparable relative motion of a recording head (19) with respect to a recording media (21) so that scanned pixel information is recorded on the media (21) concurrently with its generation.

Method and means for the real-time storage of images captured by an

Selective copying apparatus wherein selected portions of a source document are copied onto a copy paper at any position on the copy paper and wherein information is deleted or inserted by the user from an input keyboard. A manually-operated portable scanner is used by the operator to scan a selected portion of the document by placing the scanner at the desired line position and moving the scanner across the document. The scanned image is converted into digital data. A copier responds to the digital data and copies the scanned image onto a copy paper at a line position which is also selected by the operator. Thus, the image selected by the operator on the source document is reproduced at a position on the copy paper which is also separately selected by the operator.

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Palo Alto, CA, United States of America

Armin Miller