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公开(公告)号：CA1321509C
公开(公告)日：1993-08-24
申请号：CA601707
申请日：1989-06-05
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: Near letter quality (NLQ) characters are formed using direct electrostatic printing (DEP) by providing a printhead structure containing at least three equally spaced rows of equally spaced and staggered apertures. In the preferred embodiment, the printhead structure includes at least four rows of apertures. The number of rows is equal to the disance between aperture centers divided by the diameter of a spot of toner deposited by each of the apertures.
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公开(公告)号：DE69018222D1
公开(公告)日：1995-05-04
申请号：DE69018222
申请日：1990-12-18
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W , LINDENFELSER WILLIAM M , SOTACK JOHN D
Abstract: Direct electrostatic printing apparatus including structure for delivering developer or toner particles to a printhead forming an integral part of the printing device. The toner particles are attracted from a toner delivery system (24) towards a support for an image receiving substrate (30), passing through apertures (76) in the printhead structure. The printhead structure includes control electrodes (70) and a shield electrode structure (72) secured to opposite sides of an insulative base (31). The radius of the opening of a control electrode (70) is smaller than the radius of a corresponding shield electrode (72) opening resulting in larger peak potentials for controlling toner flow for the same voltage applied to the control electrode of a printhead aperture wherein the control electrode opening is larger than the opening in a corresponding shield electrode opening.
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公开(公告)号：DE68917279D1
公开(公告)日：1994-09-08
申请号：DE68917279
申请日：1989-12-22
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: A Direct Electrostatic Printer having a printhead structure (14) disposed intermediate a toner supply (18) and a record substrate (46) such that the control electrodes (37) thereof are on the toner supply (18) side of the printhead structure (14). The shield electrode (36) is disposed on the side of the printhead (14) nearest the record substrate (46). With this arrangement the control electrode (37) is roughly four times more effective than prior art devices in repelling toner in the off state. Thus, a control voltage (41) of 100 volts is sufficient to modulate the flow of toner through the apertures (40) which previously required approximately 400 volts when operated in the normal forward direction. Also, wrong sign toner accumulates on the side of the printhead structure (14) nearest the supply (18) of toner thus, allowing for toner removal from the printhead structure (14) and its return to the toner supply (18) which avoids having to deposit the wrong sign toner on the recording substrate (46).
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公开(公告)号：DE69008975D1
公开(公告)日：1994-06-23
申请号：DE69008975
申请日：1990-08-28
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W , SULLIVAN WILLIAM A
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公开(公告)号：DE68911750D1
公开(公告)日：1994-02-10
申请号：DE68911750
申请日：1989-05-31
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: Direct electrostatic printing (DEP) is optimized by presenting well charged toner (34) to a charged toner conveyor (18) which conveys the toner to an apertured printhead structure (14) for propulsion therethrough. The charged toner conveyor comprises a plurality of electrodes (24, 26, 28, 30) wherein the electrode density is relatively large for enabling a high toner delivery rate without risk of air breakdown. The printhead structure is constructed for minimization of aperture clogging. To this end the thickness of the printhead structure is about 0.025 mm and the aperture diameter (i.e. 0.15 mm) is large compared to the printhead thickness.
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Patent Agency Ranking
公开(公告)号：CA1308900C
公开(公告)日：1992-10-20
申请号：CA550203
申请日：1987-10-26
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W , SOTACK JOHN D
Abstract: Direct Electrostatic Printing apparatus including structure for removing wrong sign developer particles from a printhead forming an an integral part of the printing device. The printing device includes, in addition to the printhead, a conductive shoe which is suitably biased during a printing cycle to assist in the electrostatic attraction of developer passing through apertures in the printhead onto the copying medium disposed intermediate the printhead and the conductive shoe. During a cleaning cycle, the printing bias is removed from the shoe and an electrical bias suitable for creating an oscillating electrostatic field which effects removal of toner from the printhead is applied to the shoe.
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公开(公告)号：DE69323133D1
公开(公告)日：1999-03-04
申请号：DE69323133
申请日：1993-08-23
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: A scavengeless development system in which toner (44) is detached from a donor belt (42) and attracted to latent electrostatic images carried by an image receiver (10) positioned adjacent the belt (42). Generation of a controlled powder cloud of toner particles (44) is effected using AC electric fields created by an AC voltage source (104) and an embedded electrode structure (102) stationarily positioned behind the donor belt (42). Unused toner is removed from the donor belt (42) in a manner - using a conductive cleaning brush (106) connected to a DC bias (108) - which avoids history effects due to accumulation of highly charged, relatively small toner particles (44) on the donor belt.
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公开(公告)号：DE69015141T2
公开(公告)日：1995-07-27
申请号：DE69015141
申请日：1990-12-21
Applicant: XEROX CORP
Inventor： ABRAMSOHN DENNIS A , NICHOL-LANDRY DEBORAH , SYPULA DONALD S , SCHMIDLIN FRED W , CHASKO JEROME P , FRANK JOHN A , MAMMINO JOSEPH , GARY WILLIAM L , SPRINGETT BRIAN E , MURTI KRISHNA D
Abstract: An ionographic imaging member containing a conductive layer (67) and a uniform and continuous dielectric imaging layer (66) free of voids, the imaging layer having a dielectric constant of from about 1.5 to about 40 and a thickness of at least about 45 micrometers, the thickness divided by the dielectric constant having a value of from about 30 to about 60 micrometers. This member may be used in an ionographic imaging process.
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公开(公告)号：DE68917279T2
公开(公告)日：1995-05-11
申请号：DE68917279
申请日：1989-12-22
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: A Direct Electrostatic Printer having a printhead structure (14) disposed intermediate a toner supply (18) and a record substrate (46) such that the control electrodes (37) thereof are on the toner supply (18) side of the printhead structure (14). The shield electrode (36) is disposed on the side of the printhead (14) nearest the record substrate (46). With this arrangement the control electrode (37) is roughly four times more effective than prior art devices in repelling toner in the off state. Thus, a control voltage (41) of 100 volts is sufficient to modulate the flow of toner through the apertures (40) which previously required approximately 400 volts when operated in the normal forward direction. Also, wrong sign toner accumulates on the side of the printhead structure (14) nearest the supply (18) of toner thus, allowing for toner removal from the printhead structure (14) and its return to the toner supply (18) which avoids having to deposit the wrong sign toner on the recording substrate (46).
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公开(公告)号：DE69006949D1
公开(公告)日：1994-04-07
申请号：DE69006949
申请日：1990-07-03
Applicant: XEROX CORP
Inventor： SCHMIDLIN FRED W
Abstract: Direct electrostatic printing (DEP) is enhanced by the provision of a shutter mechanism (54) for preventing toner dislodged from a printhead structure from being deposited on copy substrates. The shutter is interposed between the printhead structure and the copy substrate during a cleaning cycle. The dislodged toner is removed from between the printhead structure and the copy substrate with a combination suction and toner collection device.
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