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POLYGON SCANNER

IP.com Disclosure Number: IPCOM000023338D
Original Publication Date: 1977-Jun-30
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 379K

Publishing Venue

Xerox Disclosure Journal

Abstract

A scanning polygon assembly is provided which comprises a plurality of identical facet blocks 10 arranged for 3600 in abutting relationship on a platform 25. The platform 25 has an annular lip 36 against which two corners of each block abut so the facets 12 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 40 and 42 of each block to engage the lip 36 (and thus assure such engagement) due to the centrifugal force exerted thereon during rotation of the polygon. An annular shallow groove 43 is located in the surface of plat-form 25 across which the facet blocks 10 span. The width of the groove is substantial compared to the distance between edge 16 and facet 12 (approximately 80%) . The purpose of the groove is to decrease the area of surface on which the blocks 10 rest to substantially reduce the effects of an imperfect surface 25 on the blocks 10, which may tend to tilt each block and increase the angle tolerances between the facets 12.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

POLYGON SCANNER
John M, Lang

Proposed Classification
U.S. Cl. 178/7.6
mt. Cl, H04n 3/00

A scanning polygon assembly is provided which comprises a
plurality of identical facet blocks 10 arranged for 3600 in
abutting relationship on a platform 25. The platform 25 has
an annular lip 36 against which two corners of each block abut
so the facets 12 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 40 and 42 of each block to engage the lip
36 (and thus assure such engagement) due to the centrifugal
force exerted thereon during rotation of the polygon. An
annular shallow groove 43 is located in the surface of plat~
form 25 across which the facet blocks 10 span. The width of
the groove is substantial compared to the distance between
edge 16 and facet 12 (approximately 80%) . The purpose of the
groove is to decrease the area of surface on which the blocks
10 rest to substantially reduce the effects of an imperfect
surface 25 on the blocks 10, which may tend to tilt each block
and increase the angle tolerances between the facets 12.

(2

PIG. /

Volume 2 Number 3 May/June 1977 23

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Page 2 of 2

II

POLYGON SCANNER (Cont~d)

The blocks 10 are constructed by stacking a plurality of rec~
tangular steel blocks 10 together, each having four edges 12,
14, 16 and 18. A portion of the edge 12 of...