US4047793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polygon scanner with an annular lip
Assignee: Xerox Corp
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Filing: 1976-04-09
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Granted: 1977-09-13
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Expires: 1996-04-09
Abstract
Abstract A scanning polygon assembly is provided which comprises a plurality of identical facet blocks arranged in abutting relationship on a platform. The platform has an annular lip against which two corners of each block abut so the facets form chords along the lip to form a polygon. The abutting relationship between the blocks is a tight fit but not a forced fit in order that the blocks are free enough to allow the corners to engage the lip (and thus assure such engagement) due to the centrifugal force exerted thereon during rotation of the polygon.
Inventors
- 👤 John M. Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:02
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
213 words
A scanning polygon comprising an upper plate and a lower plate, each having an inner surface; a plurality of identical blocks located between said plates and each having an upper surface engaging said upper plate, a lower surface engaging said lower plate and first, second and third side edges joining said upper and lower surfaces; said first and second side edges intersecting said third side edge to form respective corners therewith; said third edge being a highly reflective facet; an annular lip extending from the inner surface of at least one of said plates towards the other of said plates; the height of said lip beyond said inner surface being substantially less than the thickness of said facet edge; said blocks being arranged in such a manner that said first edge of one block abuts said second edge of the block adjacent thereto, and said corners of each block engages said lip whereby said facet edges of each block form chords along the lip to form a polygon; the angle of the corner formed by said first edge and said facet being substantially 90°; and the angle of the corner formed by said second edge and said facet being substantially 90° - (360°/N) where N is the number of facets forming the polygon.
Claim 2
Dependent Claim
213 words
A scanning polygon comprising an upper plate and a lower plate, each having an inner surface; a plurality of identical blocks located between said plates and each having an upper surface engaging said upper plate, a lower surface engaging said lower plate and first, second and third side edges joining said upper and lower surfaces; said first and second side edges intersecting said third side edge to form respective corners therewith; said third edge being a highly reflective facet; an annular lip extending from the inner surface of at least one of said plates towards the other of said plates; the height of said lip beyond said inner surface being substantially less than the thickness of said facet edge; said blocks being arranged in such a manner that said first edge of one block abuts said second edge of the block adjacent thereto, and said corners of each block engages said lip whereby said facet edges of each block form chords along the lip to form a polygon; the angle of the corner formed by said first edge and said facet being substantially 90°; and the angle of the corner formed by said second edge and said facet being substantially 90° - (360°/N) where N is the number of facets forming the polygon.
Claim 3
Dependent Claim
17 words
The structure as recited in claim 1 wherein one said annular lip extends from the lower plate.
Claim 4
Dependent Claim
41 words
The structure as recited in claim 1 wherein both of said plates have annular lips extending toward one another and being engaged by the corners of said blocks, the combined height of said lips being substantially less than said facet thickness.
Claim 5
Dependent Claim
207 words
A scanning polygon comprising an upper plate and a lower plate, each having an inner surface; a plurality of identical blocks located between said plates and each having an upper surface engaging said upper plate, a lower surface engaging said lower plate and first, second and third side edges joining said upper and lower surfaces; said first and second side edges intersecting said third side edge to form respective corners therewith; said third edge being a highly reflective facet; an annular lip extending from the inner surface of at least one of said plates towards the other of said plates; the height of said lip beyond said inner surface being substantially less than the thickness of said facet edge; said blocks being arranged in such a manner that said first edge of one block abuts said second edge of the block adjacent thereto, and said corners of each block engage said lip whereby said facet edges of each block form chords along the lip to form a polygon; an annular groove in said inner surface of at least one of said plates, each of said blocks spanning said groove, the radial width of said groove being of substantial dimension compared to the radial width of said blocks.
Claim 6
Dependent Claim
207 words
A scanning polygon comprising an upper plate and a lower plate, each having an inner surface; a plurality of identical blocks located between said plates and each having an upper surface engaging said upper plate, a lower surface engaging said lower plate and first, second and third side edges joining said upper and lower surfaces; said first and second side edges intersecting said third side edge to form respective corners therewith; said third edge being a highly reflective facet; an annular lip extending from the inner surface of at least one of said plates towards the other of said plates; the height of said lip beyond said inner surface being substantially less than the thickness of said facet edge; said blocks being arranged in such a manner that said first edge of one block abuts said second edge of the block adjacent thereto, and said corners of each block engage said lip whereby said facet edges of each block form chords along the lip to form a polygon; an annular groove in said inner surface of at least one of said plates, each of said blocks spanning said groove, the radial width of said groove being of substantial dimension compared to the radial width of said blocks.
Claim 7
Dependent Claim
17 words
The structure as recited in claim 4 wherein one said annular lip is on the lower plate.
Claim 8
Dependent Claim
19 words
The structure as recited in claim 4 wherein one said plate with one said groove is the lower plate.
Claim 9
Dependent Claim
52 words
The structure as recited in claim 4 wherein each plate has said annular lip extending towards each other and being engaged by the corners of said blocks, the combined height of said lips being substantially less than said facet thickness; and each plate has said annular groove in said inner surface thereof.
Claim 10
Dependent Claim
19 words
The structure as recited in claim 4 wherein each plate has said annular groove in said inner surface thereof.
Claim 11
Dependent Claim
53 words
The structure as recited in claim 4 wherein the angle of the corner formed by said first edge and said facet is substantially 90° and the angle of the corner formed by said second edge and said facet is substantially 90° - (360°/N) where N is the number of facets forming the polygon.
References Cited (Backward Citations)
US2113411A
Cited
GB502696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |