US3893764A - Plural reflector, single speed uni-directional scanning device - Google Patents

Plural reflector, single speed uni-directional scanning device Download PDF

Info

Publication number
US3893764A
US3893764A US434182A US43418274A US3893764A US 3893764 A US3893764 A US 3893764A US 434182 A US434182 A US 434182A US 43418274 A US43418274 A US 43418274A US 3893764 A US3893764 A US 3893764A
Authority
US
United States
Prior art keywords
reflector
scanning
document
support members
predetermined axis
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
US434182A
Other languages
English (en)
Inventor
Jack Chia Kai Pei
Hitoshi Kitahara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Application granted granted Critical
Publication of US3893764A publication Critical patent/US3893764A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • ABSTRACT In a scanning device for a copying machine and the like including a light source for illuminating document, a photosensitive material, and reflecting means for directing light from the document towards the photosensitive material, the improvement comprising the reflecting means including a plurality of reflectors radially disposed about a predetermined axis for scanning the original document by progressively directing the light from the document towards the photosensitive material; a plurality of rotatable reflector support members radially disposed about the predetermined axis, each pair of reflector support members being oppositely disposed about the axis and being provided with internal slots for receiving the reflectors so that a continuous movement path is provided between each pair of opposed reflector support members for its associated reflector; and means for
  • This invention relates to a document scanning device for use in copying machines and the like and more specifically to a document scanning device of the type in which a stationary document is scanned by rotating reflectors.
  • Document scanning devices of this type typically comprise, as shown in FIG. 1, a manuscript support plate, 1;, for holding a document in a stationary position, a light source, c, for uniformly illuminating the document, a, and a moving reflector, d, which is reciprocally rotated to scan document a during the forward scan motion of the reflector so thatlight reflected from the document, a, is progressively directed through a lens, e, and a fixed reflector,f, to a photosensitivebody, g.
  • the moving reflector, d has to return to the initial scanning position after it has completed the forward motion.
  • the size of the mechanism tends to become large and requires high precision. Further, vibration develops in every part of the mechanism due to the continuous oscilating or reciprocal motion of the reflector, imposing limits to the scanning speed.
  • Each reflector after having scanned the manuscript, is quickly retracted along a radial path in the reflector flector will not be interrupted.
  • FIG. 1 is a schematic diagram of a prior art copying machine employing a scanning device of the reciprocal rotary type.
  • FIG. 2 is a partial cross-sectional diagram of an illustrative embodiment of this invention.
  • FIG. 3 is a perspective view of major parts of an illustrative embodiment of this invention.
  • FIGS. 2 and 3 there is illustrated a plate, 1, for holding a document, 2.
  • a rotating shaft, 3, is driven at a constant speed in a predetermined direction by appropriate means.
  • On the rotating shaft are mounted a plurality of transparent reflector support members, 5, radially about shaft 3 at predetermined, equal angular intervals. The angular intervals are such that each support member, 5, is a always opposed by another support member mounted 180 from the first support member on shaft 3.
  • An internal guide groove or slot, 6, is privided within each of the support members, 5.
  • each movement path comprises a radial line which crosses the center line of rotating shaft 3.
  • a slidable reflector which is restricted to its associated path.
  • Cushion members 10 i and 11 are on both sides of each of the sliding reflecsupport member so that scanning of the succeeding retors, 9, and function as dampeners to restrict vibration.
  • the document scanning device of this invention executes scanning inthe following manner.
  • the scanning of the document in FIG. 3 is started from position A2 and is completed at position A3.
  • Each reflector, 9, during the scan remains at the scanning position on its movement path due to a pair of clips 15 or restraints within the guides of the support members, 5.
  • the reflector, 9, slides down after being shuttled across by a pair of actuators, situated at both edges of the reflector and outside of the optical path, along the guide and into a locked position at the opposite end.
  • the reflector is out of the way of the reflector succeeding it and thus the succeeding reflector can commence scanning without interference from the reflector retracted to the locked position.
  • Retention is provided for by a pair of clips 15 within the guides of the support members, 5.
  • the angular interval between successive support members, 5, should be no less than 0: 8.
  • the light reflected from the document, 1, is progressively directed by each of the reflectors, 9, through lens 12 and fixed mirror 13 to a photosensitive body 14 such as a selenium photosensitive drum used in electrophotography.
  • each reflector immediately after scanning, is quickly retracted from the scanning position along its radial movement path provided in the reflector support members, copying speed is greatly enhanced with a rel- 3 atively simple and small device which can be readily manufactured.
  • a scanning device for a copying machine and the like including a light source for illuminating a document, a photosensitive material, and reflecting means for directing light from said document towards the photosensitive material, the improvement comprising;
  • said reflecting means including a plurality of reflectors respectively disposed along radials extending from said predetermined axis for scanning the original document by progressively directing the light from the document towards the photosensitive material;
  • each pair of reflector support members being radially, coplanarly, respectively disposed on opposite sides of said axis and having internal slots for slideably receiving and supporting one of said reflectors and for providing a continuous path between the two reflector supporting members in each pair for said one reflector;
  • each reflector after scanning a document, retracts along said continuous path from a scanning position on one side of said predetermined axis to a sheltered position on the side of said axis opposite said one side where it does not interfere with scanning by the following reflector and shuttles back and forth between said scanning and sheltered positions as said reflector support members are rotated 2.
  • each said reflector is retracted to said sheltered position by actuators aided by the force of gravity after it has scanned the document.
  • a scanning device for a copying machine and the like including a light source for illuminating a document, a photosensitive material, and reflecting means for directing light from said document towards the photosensitive material, the improvement comprising;
  • said reflecting means including a plurality of reflectors radially disposed about a predetermined axis for scanning the original document by progressively directing the light from the document to wards the photosensitive material;
  • each pair of reflector support members being co-planarly, respectively disposed on opposite sides of said axis and having internal slots for slideably receiving and supporting one of said reflectors and for providing a continuous path between the two reflector supporting members each pair for said one reflector;
  • a manuscript scanning device for copying machines and the like comprising;
  • each reflector after scanning a document, retracts along said continuous path from a scanning position on one side of said predetermined axis to a sheltered position on the side of said axis opposite said one side where it does not interfere with scanning by the following reflector and shuttles back and forth between said scanning and sheltered positions as said reflector support members are rotated.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Facsimile Scanning Arrangements (AREA)
US434182A 1973-01-29 1974-01-17 Plural reflector, single speed uni-directional scanning device Expired - Lifetime US3893764A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1114973A JPS5345692B2 (enrdf_load_stackoverflow) 1973-01-29 1973-01-29

Publications (1)

Publication Number Publication Date
US3893764A true US3893764A (en) 1975-07-08

Family

ID=11769947

Family Applications (1)

Application Number Title Priority Date Filing Date
US434182A Expired - Lifetime US3893764A (en) 1973-01-29 1974-01-17 Plural reflector, single speed uni-directional scanning device

Country Status (4)

Country Link
US (1) US3893764A (enrdf_load_stackoverflow)
JP (1) JPS5345692B2 (enrdf_load_stackoverflow)
CA (1) CA998546A (enrdf_load_stackoverflow)
GB (1) GB1427671A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2255196B (en) * 1991-04-22 1994-06-08 Wicks & Wilson Ltd Microfilm scanning apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994708A (en) * 1931-08-14 1935-03-19 Radio Inventions Inc Television scanning system
US3049049A (en) * 1959-10-28 1962-08-14 Katona Joseph Motion picture apparatus
US3142224A (en) * 1961-04-10 1964-07-28 Control Data Corp Reflective scanning projection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994708A (en) * 1931-08-14 1935-03-19 Radio Inventions Inc Television scanning system
US3049049A (en) * 1959-10-28 1962-08-14 Katona Joseph Motion picture apparatus
US3142224A (en) * 1961-04-10 1964-07-28 Control Data Corp Reflective scanning projection system

Also Published As

Publication number Publication date
JPS4999036A (enrdf_load_stackoverflow) 1974-09-19
CA998546A (en) 1976-10-19
JPS5345692B2 (enrdf_load_stackoverflow) 1978-12-08
DE2403785A1 (de) 1974-08-01
GB1427671A (en) 1976-03-10
DE2403785B2 (de) 1977-02-24

Similar Documents

Publication Publication Date Title
US3897148A (en) Optical scanning system
US3777135A (en) Illumination system
US4120578A (en) Continuously variable reduction scanning optics drive
CA1087427A (en) Continuously variable reduction copier optics systems
US3709602A (en) Optical path length compensation in a copier
US4150873A (en) Bi-directional optical scanning
US3476478A (en) Apparatus for changing the magnification of a photocopier without changing the conjugate length of the optical system
EP0017326B1 (en) Scanning system for a xerographic machine
US4154500A (en) Exposure optical system for electrostatic copying machine or the like
US3758774A (en) Illumination system for copier machines arranged to minimize glare with respect to an operator
US3609024A (en) Slit exposure device
US3917393A (en) Varioslit
US3586849A (en) Illumination system
US4093374A (en) Multiple range variable magnification reproduction machine
US3893764A (en) Plural reflector, single speed uni-directional scanning device
US3876302A (en) High speed low inertia scanning system for a copying machine
US3650621A (en) Optical imaging system
US3652156A (en) Linear-to-drum optical scan converter system
US4285590A (en) Precession scanning system for copier device
US4135812A (en) Magnification change mechanism
CA1095005A (en) Document illumination aparatus
US4161359A (en) Apparatus for synchronizing movement between an optical scanning system and an imaging member
US3927940A (en) Manuscript scanning device for copying machines and the like
US3575509A (en) Slit exposure device
US3304365A (en) Scanning apparatus with dynamic focusing