EP0352997A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Direct electrostatic printer (DEP) and printhead structure therefor
Assignee: Xerox Corp
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Filing: 1989-07-24
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Granted: —
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Expires: 2009-07-24
Abstract
Abstract Near letter quality (NLQ) characters are formed using direct electrostatic printing (DEP) by providing a printhead structure (14) containing at least three equally spaced rows (64, 66, 68, 70) of equally spaced and staggered apertures (40). In the preferred embodiment, the printhead structure includes at least four rows of apertures. The number of rows is equal to the distance between aperture centers divided by the diameter of a spot of toner deposited by each of the apertures.
Inventors
- 👤 Fred W. Schmidlin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G03G15/346; B; B41; B41J; B41J2/00; B41J2/385; B41J2/41; B41J2/415; B41J2/4155; G03G2217/00; G03G2217/0008; G03G2217/0025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
Direct electrostatic printing apparatus for forming toner images on an image receiving member, said apparatus comprising: an apertured printhead structure (14) for depositing spots of toner on the image receiving member; said apertured printhead structure including a plurality of equally spaced rows (64, 66, 68, 70) of equally spaced apertures (40), said plurality of rows being spatially arranged and sufficient in number to enable images to be printed without voids between spots of toner.
Claim 2
Dependent Claim
74 words
Direct electrostatic printing apparatus for forming toner images on an image receiving member, said apparatus comprising: an apertured printhead structure (14) for depositing spots of toner on the image receiving member; said apertured printhead structure including a plurality of equally spaced rows (64, 66, 68, 70) of equally spaced apertures (40), said plurality of rows being spatially arranged and sufficient in number to enable images to be printed without voids between spots of toner.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1 wherein the number of rows is equal to at least three and is equal to the distance between aperture centers divided by the diameter of a spot of toner.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1 or claim 2, wherein there are four rows of apertures.
Claim 5
Dependent Claim
21 words
Apparatus according to any preceding claim, wherein the apertures of one row are staggered relative to the apertures of another row.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 4, wherein the degree of stagger is approximately equal to the size of a spot of toner.
Claim 7
Dependent Claim
14 words
Apparatus according to any preceding claim, wherein said apertures have a circular cross section.
Claim 8
Dependent Claim
15 words
Apparatus according to any preceding claim, wherein said apertures have a diameter of 0.15 mm.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 7, wherein the spots of toner deposited by each aperture have a diameter no greater than 0.10 mm.
Claim 10
Dependent Claim
24 words
Apparatus according to claim 7 or claim 8, wherein the spots of toner deposited by each aperture have a diameter of approximately 0.0750 mm.
References Cited (Backward Citations)
No citation records indexed.
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