Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
  • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
  • H04N1/1021—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components using a lead screw or worm
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
  • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
  • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
  • H04N1/1039—Movement of the main scanning components
  • H04N1/1043—Movement of the main scanning components of a sensor array
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
  • H04N1/393—Enlarging or reducing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
  • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
  • H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
  • H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays

Definitions

• the invention relates to a scanner for optical scanning an original, more specifically a scanner by which it is possible to change the reproduction ratio of the original in connection with the scanning.
• Scanners of various types are known and a typical representative of such scanners is disclosed in EP patent No. 00366020, according to which the apparatus Includes a linear CCD-unit moved in the focussing plane of a fixed lens for scanning the image of the original generated in the focussing plane.
• Said scanner suffers, however, from the essential drawback that the distance between the CCD-unit and the optical centre of the lens and between the original and the centre is fixed. In this way, only one reproduction ratio can be achieved with a given lens because a change of the reproduction ratio implies either a change of the lens or use of a zoom-type lens. This implicates, however, that the scanner does not always function so that its optimum resolution is utilized.
• the purpose of the invention is to provide a scanner allowing for arbitrarily choosing reproduction ratios within a predetermined range without changing the lens and so that the scanner always functions, to utilize its optimum resolution.
• This purpose is fulfilled according to the invention by constructing the guide rails of the scanner as specified in the characterizing portion of claim 1. By means of this structure it is possible with one lens system to achieve a large range of reproduction ratios while maintaining the resolution of the scanner.
• the drawing illustrates the most important parts of the scanner comprising mainly an original table 1, a first movable section 2 and a second movable section 3.
• the movable section 2 is arranged to move perpendicular to the original table 1 and is guided in this movement by the guide rail 4 and driven in this movement by a motor 5 driving a spindle 6.
• Spindle 6 is in engagement with a nut secured on section 2. This nut is not illustruated in the drawing.
• Section 3 may likewise be moved in a direction perpendicular to original table 1 guided by guide rail 4 operated by a motor 7 mounted on section 2.
• Motor 7 operates a spindle 8 engaging a nut 9 mounted on section 3.
• Section 3 carries an objective 10 for focussing an image of an original 11, placed on the original table, on a CCD-unit 12 forming part of a CCD-module 13 mounted on section 2. This CCD-module will be described in further detail in the following.
• sections 2 and 3 may be moved in a direction perpendicular to original table 1. This movement is controlled by a common guide rail 4 and the movements are propelled by motors 5 and 7.
• motors 5 and 7 As a focussing on the CCD-unit of original 11 placed on original table 1 is always wanted, irrespective of the reproduction ratio, there must always be a predetermined relation between the distances between section 3 and original table 1 and section 3 and section 2.
• the CCD-module 13 comprises a CCD- unit 12, a motor 14, a spindle 15 and guiding means 16.
• Motor 14 serves to displace CCD-unit 12 in the focussing plane of objective 10 by means of spindle 15, thereby allowing for scanning the image of original 11.
• the printed circuit board 17 on which the CCD-unit is mounted also carries circuits for preprocessing the signals from the CCD-unit.
• Motors 5, 7 and 14 are all so-called stepper motors and by the utilization of the generally known properties of such motors it is possible to position the individual sections in mutual relationship by counting the number of drive pulses fed to the motors.
• a common guide rail 4 which as shown may include two vertically positioned parallel H-profiles 18, 19 whose oppositely facing internal rails 20, 21 serve as guide rails for the first section, e.g. unit 3, while the external rails 22, 23 facing away from each other serve as guide rails for the second section, e.g. unit 2, it is achieved that the guiding members, e.g.
• the wheels 24, 25, for the respective sections 2, 3 can be placed approximately at the same level on guide rails 4, and it is further advantageous that the two sections track with each other if some small curvilinear or linearity irregularities occur in guide rails 4, thereby ensuring that objective 10 and CCD-unit 12 always occupy the same position in relation to each other.

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Facsimile Scanning Arrangements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8108532

Family Applications (1)

Country Status (4)

Cited By (7)

Citations (4)

• 1988
  • 1988-04-06 DK DK185088A patent/DK159088C/da active
• 1989
  • 1989-04-06 EP EP19890904524 patent/EP0410992A1/en not_active Ceased
  • 1989-04-06 JP JP50408689A patent/JPH03503704A/ja active Pending
  • 1989-04-06 WO PCT/DK1989/000077 patent/WO1989010036A1/en not_active Application Discontinuation

Patent Citations (4)

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