Electromagnetic gray scale printer
First Claim
Patent Images
1. A process for printing an image comprising:
- (a) transmitting digital data to a printer that constructs images from digital data;
(b) sensing the strength of a changing, recurring magnetic field adjacent to a print medium; and
(c) periodically synchronizing the printing of a line on said medium with changes in the magnetic field as sensed in step (b), by responding to periodic occurrences of a predetermined strength of the changing magnetic field to effect said synchronization.
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Abstract
A gray scale image poster printer reproduces a digitally stored bit map image on a printer using an electrostatic and magnetic toner to generate gray scale images by expanding each line of the original stored image into a plurality of subpixels along the horizontal scanning lines and by synchronizing the printing of the subpixel lines with a changing magnetic field that changes the amount of toner deposited in each subpixel.
44 Citations
9 Claims
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1. A process for printing an image comprising:
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(a) transmitting digital data to a printer that constructs images from digital data; (b) sensing the strength of a changing, recurring magnetic field adjacent to a print medium; and (c) periodically synchronizing the printing of a line on said medium with changes in the magnetic field as sensed in step (b), by responding to periodic occurrences of a predetermined strength of the changing magnetic field to effect said synchronization. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for printing images comprising:
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a poster printer having a display sheet, means for receiving a digital image, and means for printing an image on said display sheet, a computer and means for expanding each pixel of said digital image into a plurality of subpixels to create an expanded image, means for mapping the color tone of each pixel of said digital image into the corresponding subpixels of said expanded image, and said printing means comprising an agitator roller having a plurality of lengthwise projecting magnetized splines of alternating polarity for dispersing a toner and means for coordinating the disposition of toner on said display sheet during printing with the changes in the magnetic field caused by rotating said agitator roller.
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7. An apparatus for printing images comprising:
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a poster printer having a display sheet, means for receiving a digital image, and means for printing an image on said display sheet, a computer and means for expanding said pixel of said digital image into a plurality of subpixels to create an expanded image, means for mapping the color tone of each pixel of said digital image into the corresponding subpixels of said expanded image, and said printing means comprising means for producing a changing, recurring magnetic field for dispersing a toner and means for coordinating the disposition of toner on said display sheet during printing with the changes in said magnetic field. - View Dependent Claims (8, 9)
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Specification