US3650621A - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
US3650621A
US3650621A US811561A US3650621DA US3650621A US 3650621 A US3650621 A US 3650621A US 811561 A US811561 A US 811561A US 3650621D A US3650621D A US 3650621DA US 3650621 A US3650621 A US 3650621A
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US
United States
Prior art keywords
light responsive
document
responsive member
imaging
supporting surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US811561A
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English (en)
Inventor
William G Lewis
Robert W Moorhusen
Richard H Nagel
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Xerox Corp
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Xerox Corp
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Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
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Publication of US3650621A publication Critical patent/US3650621A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/522—Projection optics
    • G03B27/525—Projection optics for slit exposure
    • G03B27/526—Projection optics for slit exposure in which the projection optics move
    • G03B27/527—Projection optics for slit exposure in which the projection optics move as a whole in a translatory movement

Definitions

  • the document to be reproduced is fixedly supported adjacent the light responsive member with the imaging device therebetween.
  • the imaging device is moved in the direction opposite the direction of rotation of the light responsive member in an arcuate path concentric with the light responsive member and document supporting surface to thereby create a usable pattern on the surface of the light responsive member in conformity with the document being reproduced.
  • a xerographic surface com prising a layer of photoconductive insulating material affixed to. a conductive backing is used to support electrostatic images.
  • the xerographic surface is electrostatically charged uniformly over its surface and then exposed to a light patternof the image being reproduced to thereby discharge the charge in the areas where light strikes the layer.
  • the undischarged areas of the layer thus form an electrostatic charge pattern in conformity with the configuration of the original light pattern.
  • the latent electrostatic image can be then developedby contacting it with a finely divided electrostatically attractable material such as powder.
  • the powder is held in image areas by the electrostatic charges onthe layer. Where the charge field is greatest, the greatest amount of material is deposited; where the charge field'is least, little or no material is deposited.
  • a powder image is produced in conformity with the light image v of copy being reproduced.
  • the powder may then be subsequently transferred to a sheet of paper or other surface and affixed thereto to forma permanent print.
  • Imaging systems capable of projecting light images of an original document onto a light responsive member held a short distance away are described in pending applications Ser. Nos. 683,988 filed Nov. 17, I967 in the name of Osmar A. Ullrich, Jr.',' et al. 683,837 filed Nov. 17, 1967 in the name of Robert W. Gun dlach and 683,987 filed Nov. 17, 1967 in the name of Robert W. Gundlachet al. According to those disclosures, it is necessary to support the object being reproduced and the light responsive surface immovable with respect to each other during imaging. Imaging occurs in a flowing manner as the object and image surfaces are held fixed and the imaging device moves relative .thereto. The imaged surface may then be developed and transferred to the final backing sheet.
  • Such prior art imaging systems are not universally suited for use in continuous and automatic xerographic reproducingmachines.
  • expanded utility of the reproducing machine may be attained if the elements of the imaging station may be made to function in a continuous mode as the other xerographic processing stations.
  • the document to be reproduced is fixedly su-pported-adjacent the light responsive surface with the short conjugate length imaging device therebetween.
  • the imaging device is moved in the direction opposite the direction of rotation of the light responsive surface in an arcuate path concentric with the light responsive member and document supporting surface to thereby create a usable pattern on the surface of the light responsive member in conformity with the document being reproduced.
  • FIG. 1 is a schematic representation of a continuous and automatic xerographic reproducing machine employing the imaging system of the instant invention
  • FIG. 2 is a perspective view of the imaging system shown in FIG. 1.
  • the auto- I matic xerographic reproducing machine includes light responsive member 10 in the form of a xerographic plate or surface formed in the cylindrical shape of a drum.
  • the plate has a photoconductive layer or light receiving surface on a conductive backing supported by drive shaft 12 journaled in the machine frame to rotate under the influence of a suitable power source, not shown, in the direction indicated by the arrow. The rotation will cause the plate surface to sequentially pass a series of xerographic processing station's.
  • the light responsive surface is shown as a xerographic surface it could be any light responsive surface, as for example, a photographic film.
  • a charging station ,A at which a uniform electrostatic charge is deposited on the photoconductive plate
  • An exposure station B at which light or radiation pattern of copy to be reproduced is projected onto the plate surface to dissipate the charge in the exposed areas thereof to thereby form a latent electrostatic image of the copy to be reproduced;
  • the document supporting surface is in a curved orientation concentric with the portion of the cylindrical xerographic member passed through the image plane in the imaging zone 16.
  • the xerographic member need not be in the shape of a right circular cylinder. It could readily be an endless belt with a curved portion thereof passing through the imaging zone.
  • the optical imaging device 18 Positioned between the document supporting surface 14 and the light responsive member 10 is the optical imaging device 18.
  • the imaging device is constructed in accordance with that disclosed in the aforementioned Gundlach et al. application.
  • This device includes a plurality of transparent light refracting lens strips 20, 22 and 24 having lens portions 26 formed thereon.
  • Lens strip is positioned two focal lengths away from the object to be reproduced as well as the intermediate field lens 22.
  • the lens portions 26 of this lens strip 20 are adapted to project light images from the document and to individually invert and revert the scanned segments of the image.
  • the lens strip 24, positioned two focal lengths away from the light responsive surface and intermediate field lens 22 will, in like turn invert and revert the images formed adjacent the field lens 22 to ultimately project ,upright wrong reading images of the scanned portions of the document onto the light responsive surface 10. This will thereby discharge the original charge on the drum into a latent electrostatic image corresponding to the document being reproduced.
  • An aperture stop 28 and field stop 30 limit the intensity and amount of light projected from the document to the light receiving surface for ensuring an even imaging of the document across the drum.
  • the aforementioned focal lengths and other parameters of the imaging elements are by way of example only since other lens stip configurations, including those creating reduced intermediate images, may be readily employed.
  • the various optical imaging elements including the lens strips and stops are secured in position with respect to each other by side support plate members 32 and light shielding plate members 34 which, like the lens strips, extend the length of the drum and document supporting surface thereby ensuring that the entire length of the document will be projected and imaged onto the xerographic surface.
  • End support plates 36 support these side frames and imaging elements with respect to each other and define a light-shielded tunnel from an area adjacent the document supporting surface and xerographic drum.
  • Tie rods 38 lend support to the assembly.
  • the end support plates 36 are mounted on shaft 12 for rotational movement in an arc concentric with the document supporting surface and drum shaped light responsive member. In this manner, the distance between the first lens strip 20 and that portion of the document supported on the document supporting surface being imaged can be maintained substantially constant during the oscillation of the imaging device. This ar-' rangement also ensures that the distance between the lens strip 24 and the xerographic surface being imaged is, in like fashion, held at a substantially fixed distance during operation of the device.
  • the ends of the side support plates 36, remote from the drum, also support lamps 40 which illuminate the object during imaging.
  • One of the end support plates 36 has a sprocket 42 secured thereto cooperable with chain 44 which is in turn coupled to reversible motor MOT-l to impart cyclical oscillating scanning motion to the imaging device.
  • the xerographic reproducing machine is started by activating the various processing stations including the imaging station.
  • the drum shaped light responsive member 10 is then rotated on the power imparting shaft 12 by its suitable power source to rotate a charged portion of the drum in the direction of thearrow to sequentially bring portions of the drum surface beneath the charging station to provide the uniform charge on the drum.
  • power source MOT-l will be energized to start the imaging device to move in a direction opposite from the direction of rotation of the drum to thereby sequentially image the original document onto the drum in a flowingly fashion.
  • the imaging device 18 After the imaging device 18 has traversed to the drum input end 48 of the imaging zone its motion will be reversed by the action of its motor to its start-of-scan position to begin a second imaging of a subsequent section of the xerographic surface 10.
  • the return, or fly back, speed of the imaging device may be equal to the speed of the light responsive member to thereby facilitate the next start-of-scan on a segment of the light responsive member contiguous with that previously imaged.
  • the machine could readily be programmed to stop after this or a predetermined number of cycles of the imaging device and consequently stop the creation of electrostatic images on the drum after a predetermined number of imaging cycles.
  • the imaged portion of the drum is then developed, transferred to a backing material such as a web 50 or a cut sheet synchronously contacting the image for fusing to create the final copy.
  • the drum is then passed through the cleaning station prior to subsequent charging and imaging in a continuous and automatic cycle of operation.
  • a 6-inch diameter drum was employed with the document supporting surface located to place the image in an arc 10 inches from the center or rotation of the xerographic drum.
  • a lens strip was then positioned therebetween with the lens strips equally positioned with respect to each other as well as the document to be reproduced and the surface of the xerographic drum.
  • the drum was then rotated at 6.28 inches per second at its surface in a clockwise direction as shown in HO. 1 while the imaging device was rotated at a linear speed of 8.97 inches per second at its extreme or 10-inch radius.
  • the lens strip imaging device effectively traveled 2.69 inches per second at the 3- inch drum radius during the same 1 second in which the drum rotated 6.28 inches. In all, the drum had effectively traveled 8.97 inches with respect to the document during the same time that the lens strip traversed the entire length of the document.
  • a document supporting surface having an arcuate cross-sectional configuration adapted to have a document to be reproduced fixedly positioned thereon
  • a light responsive member positioned adjacent said document supporting surface to define an imaging zone therebetween, said light responsive member having a curved cross-sectional configuration in the imaging zone concentric with the document supporting surface,
  • an imaging device positioned in the imaging zone, said imaging device including a plurality of transparent strips having lens surfaces formed thereon, said lens strip closest to said document supporting surface adapted to invert and revert light rays moving toward said light responsive member, said lens strip closest said light responsive surface being adapted to invert and revert posite the direction of movement of said light responsive member in a path of movement concentric with said document supporting surface to thereby create a flowing representation of the imaged document on said light responsive surface, the speed of said imaging device and said light responsive member being correlated to maintain a 1:1 reproduction of the original document.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Facsimile Scanning Arrangements (AREA)
US811561A 1969-03-28 1969-03-28 Optical imaging system Expired - Lifetime US3650621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81156169A 1969-03-28 1969-03-28

Publications (1)

Publication Number Publication Date
US3650621A true US3650621A (en) 1972-03-21

Family

ID=25206888

Family Applications (1)

Application Number Title Priority Date Filing Date
US811561A Expired - Lifetime US3650621A (en) 1969-03-28 1969-03-28 Optical imaging system

Country Status (8)

Country Link
US (1) US3650621A (sv)
JP (1) JPS4835502B1 (sv)
BE (1) BE747978A (sv)
CA (1) CA927470A (sv)
DE (1) DE2013902A1 (sv)
FR (1) FR2040174A5 (sv)
GB (1) GB1297907A (sv)
NL (1) NL7004102A (sv)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030823A (en) * 1975-03-13 1977-06-21 Brugger Richard D Copying machine
US4285590A (en) * 1980-10-15 1981-08-25 Xerox Corporation Precession scanning system for copier device
US4336995A (en) * 1980-09-24 1982-06-29 Xerox Corporation Precession scanning system for copier device
US4351605A (en) * 1981-05-11 1982-09-28 Xerox Corporation Controlled velocity transport precession system
US4362382A (en) * 1981-02-23 1982-12-07 Xerox Corporation Precession scanning system
US4367034A (en) * 1981-06-01 1983-01-04 Xerox Corporation Scanning system for copier
US4372670A (en) * 1981-02-23 1983-02-08 Xerox Corporation Precession scanning system
US4373803A (en) * 1980-09-24 1983-02-15 Xerox Corporation Precession scanning system for copier device
JPS58139162A (ja) * 1982-02-12 1983-08-18 Canon Inc プロセスキツト及びこのキツトを用いる像形成装置
US4484810A (en) * 1983-05-20 1984-11-27 Xerox Corporation Moving platen precession system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202799A1 (de) * 1982-01-28 1983-08-04 Agfa-Gevaert Ag, 5090 Leverkusen Optisches kopiergeraet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221622A (en) * 1963-12-23 1965-12-07 Gilbert A Aser Optical scanning system
NL6515110A (sv) * 1964-11-20 1966-03-25

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221622A (en) * 1963-12-23 1965-12-07 Gilbert A Aser Optical scanning system
NL6515110A (sv) * 1964-11-20 1966-03-25
GB1125887A (en) * 1964-11-20 1968-09-05 Agfa Gevaert Ag Photo-printing apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030823A (en) * 1975-03-13 1977-06-21 Brugger Richard D Copying machine
US4336995A (en) * 1980-09-24 1982-06-29 Xerox Corporation Precession scanning system for copier device
US4373803A (en) * 1980-09-24 1983-02-15 Xerox Corporation Precession scanning system for copier device
US4285590A (en) * 1980-10-15 1981-08-25 Xerox Corporation Precession scanning system for copier device
US4362382A (en) * 1981-02-23 1982-12-07 Xerox Corporation Precession scanning system
US4372670A (en) * 1981-02-23 1983-02-08 Xerox Corporation Precession scanning system
US4351605A (en) * 1981-05-11 1982-09-28 Xerox Corporation Controlled velocity transport precession system
US4367034A (en) * 1981-06-01 1983-01-04 Xerox Corporation Scanning system for copier
JPS58139162A (ja) * 1982-02-12 1983-08-18 Canon Inc プロセスキツト及びこのキツトを用いる像形成装置
JPS6258506B2 (sv) * 1982-02-12 1987-12-07 Canon Kk
US4484810A (en) * 1983-05-20 1984-11-27 Xerox Corporation Moving platen precession system

Also Published As

Publication number Publication date
JPS4835502B1 (sv) 1973-10-29
BE747978A (fr) 1970-09-28
GB1297907A (sv) 1972-11-29
CA927470A (en) 1973-05-29
NL7004102A (sv) 1970-09-30
FR2040174A5 (sv) 1971-01-15
DE2013902A1 (de) 1970-10-15

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