DE102009013831A1 - Device for scanning of books, magazines or pattern bounded at edge, has two neighboring sides of opened pattern arranged on two uniform bearing surfaces of wedge-shaped supporting device - Google Patents

Abstract

The device (1) has two neighboring sides (4,6) of the opened pattern (3) arranged on two uniform bearing surfaces (5,7) of a wedge-shaped supporting device (16). The collection direction (2,10) of a scanning unit (17) is arranged relative to the level of the side to be determined of the pattern under a pointed angle. An adjustment unit (11,13,14) moves scanning unit relative to the level of the bearing surface.

Description

The The invention relates to a device for scanning bound originals at low opening angle of the templates according to the preamble of claim 1.

The Optical detection of objects and in particular of planar templates such as scrolling, pictures, texts or the like is usually using so-called scanners, scanner backs for cameras or even commercially available digital cameras. Such a scanner has an imaging optics, via which is an image of the object to be scanned on the image plane of Imaging optics projected and recorded there by means of a digital image capture device becomes. As image capture device are arrangements of photosensitive Elements, often in the form of so-called CCD elements used.

While the scanning of flat templates meanwhile a high level in particular in terms of quality and automation, is the scanning of books, magazines or the like one-sided originals are still usually handmade. On the one hand, the handling of books or magazines complicated and difficult to automate, on the other hand occurs especially with older or already damaged Books where scanning for security reasons especially important is the problem that binding such Printing units are often mechanically very vulnerable to the opening process of the book or loads during Laying the book on flat bearing surfaces is. For example are scanning antique books by scanning these Books with normal flatbed scanners overloaded the books or the binding or the spine is affected or even destroyed, so that scanning such books frequently omitted. The main problem here is that in commercial Flatbed scanners an opening angle of the book of about 180 ° is required. Also, by binding the Leaves the scan in the area of the binding back inaccurate, since in this area bends of the leaves can not be avoided. Also, scanners with so-called. Book rockers used, where the books but also high mechanical Are subject to charges.

To remedy this problem, for example, in the GB 2 158 599 A proposed to form a book scanner such that the opening angle of the book during scanning is less than 90 °. For this purpose, the support surfaces for the pages to be scanned of the book are arranged at an obtuse angle to each other, so that the spine is less stressed to open the book during scanning as intended.

In the DE 696 29 354 T2 , of the DE 696 25 163 T2 , of the DE 697 29765 T2 as well as the DE 694 23 184 T2 Scanning devices are especially known for books in which the bearing surfaces for the two adjacent sides of a book are wedge-shaped and thus allow a further reduction of the opening angle of the book during scanning. For this purpose, a wedge-shaped support device is moved between the open pages of the book, which comes to rest the tip of the wedge in the binding of the book, whereupon the pages to be scanned of the book are pressed onto the support device and scanned there over areal operating optical systems. Here, a lot of mechanical and optical effort is driven, so that the viewing direction of the optical system is aligned as perpendicular as possible to the respective side to be scanned and thus optimal optical conditions for accurate detection of the surface of the scan nenden pages are present. As a result, the construction and control of such book scanner is complex, also the areal working optical systems are costly.

From the US 4 567528 a document scanner for books is known in which a line-like sensor is used to detect at least one side of an open book, the book is arranged with an opening angle of about 80 ° open on a corresponding holding device. In this case, the line scanner is positioned relative to the book page to be scanned in each case so that it can start scanning as far as possible in the region of the binder back and is guided successively over the page to be scanned via an adjusting device oriented approximately parallel to the page to be scanned. As a result, the entire page to be scanned can be scanned in succession and the individual scan lines combined to form an overall image of the page to be scanned. Again, it is disadvantageous that the beam path of the optical device is again aligned substantially perpendicular to the side to be scanned and thus the opening angle of the book is limited to at least about 90 °, so that the optical system on the opposite side of the book scan past the page to be scanned can. This makes it very sensitive books or other sensitive bound templates whose permissible opening angle is well below 90 °, not process with such a document scanner.

task The present invention is therefore a generic Device to propose, with the most sensitive books or Like. Bound templates without burden of the template or the binding can be scanned.

The Solution of the problem of the invention arises in terms of the method of the characterizing Features of claim 1 in cooperation with the features of Preamble. Further advantageous embodiments of the invention emerge from the dependent claims.

The Invention is based on a device for scanning books, Magazines or other templates bound on one edge, with two adjacent sides of the open template on two level bearing surfaces of a wedge-shaped receiving device are arranged and a scanning unit at least one of the Be th of Template captured. Such a generic Device is further formed that the detection direction of Scan unit relative to the plane of the page of the original to be detected is arranged at an acute angle and an adjustment the scanning unit, relatively, preferably substantially parallel moved to the plane of the support surface on which the to be scanned Page of template is present. Due to the very acute-angled detection direction relative to the plane of the page to be scanned, advantageous geometric results Conditions when scanning the book or the like., By the the necessary opening angle of the book or the like. On Values of around 30 ° and even significantly reduced can be. As a result, the book or the like. By the necessary opening particularly little mechanical load. This results in a clear oblique viewing angle of the scan unit on the side to be scanned, the substantially realized in each case acute angle of the corresponds to a wedge-shaped receiving device. By the acute-angled detection direction with respect to the plane of the page to be scanned disturbs the opposite side of the to be detected Template, otherwise due to a larger opening angle of the book or the like from the detection direction of the scanning unit has to be panned, not anymore. Figuratively speaking, the Scan unit due to the very acute angle of the detection direction related to the level of the page of the template to be captured as well at only small opening angles at this opposite Look over the page. This contributes further, that advantageous only one of the two open pages of the book or the other bound original will be scanned at the same time, because then exactly for this page the optimal acquisition conditions can be adjusted without going to the opposite one Page with regard to scanning.

It is particularly advantageous that the wedge angle between the flat bearing surfaces of the wedge-shaped receiving device is between 15 ° and 60 °, preferably substantially 30 °. The lower limit of the wedge angle is determined by the total reflection occurring on the contact surface, which is typically made of glass or another transparent material, for the side to be scanned. Thus, the opening angle of the template can be reduced even for very sensitive templates to values that are not critical for these templates and thus allow a corresponding backing of the templates. Such low opening angle have been so far with book scanners such as according to the US 4567 528 B not reached, since there the scanning unit has been aligned almost always almost perpendicular to the side to be scanned and only for detecting the page to be scanned was also inclined in the region of the binding tail a little to this vertical direction to not in the scan by the scanned side half of the original to be disturbed. It should be noted that the acute angle of the detection direction with respect to the plane of the side to be scanned should substantially correspond to the wedge angle of the recording device, but should not be greater than the wedge angle of the recording device to the entire page to be scanned even in the Capture the area of the binding spine unaffected by the opposite side of the template. Of course, it is also conceivable to design the receiving device so changeable that the wedge angle can be adapted to different desired opening angle, z. B. by mutually pivotable parts of the receiving device or by an exchange of the receiving device against a receiving device with a different wedge angle. Accordingly, then the acute angle of the detection direction in this case, if necessary because of the geometric conditions, be changed or adjusted.

Farther the angle of the detection direction of the scanning unit should be relative to the level of the page of the template to be captured a little sharper as the respective wedge angle between the flat bearing surfaces be the wedge-shaped cradle, so that the scanning unit figuratively speaking, the opposite of the side to be scanned Side of the original can look around and the linear beam path not disturbed by this site ..

It is advantageous if the adjustment unit has a linear feed device for the scanning unit, which moves the scanning unit substantially parallel to the plane of the support surface against which the page to be scanned rests. As a result, the scanning unit can execute a linear movement movement, preferably parallel to the side to be scanned, and thereby guide the page to be scanned z. B. line by line. As a result, the optical conditions such. B. Focusing, depth of field and the like during the run of the page to be scanned and must must not be readjusted during the scanning process.

In a conceivable embodiment, the device can only one of scan two adjacent pages of the open original. Due to the geometric relationships of the beam path the scan unit and the assignment of the two open Pages of the template is usually at the small target opening angles only the detection of one of the two sides possible. Therefore is at correspondingly small opening angles, the template turned over to scan the second page and the pages related to the bearing surfaces of the device must be reversed.

meaningful it is when the bearing surface of the wedge-shaped Recording device, on which the side of the original to be scanned rests, consists of a transparent material. Of course, this comes Glass and transparent plastics are used because of their optical properties do not affect the scanning process and allow a good optical image of the page to be scanned. For this In particular, the transparent support surface of the wedge-shaped Recording device, on which the side of the original to be scanned rests, also be anti-reflective, to the detection of the to be scanned Page even at very low opening angles not through Affect reflections ..

From The advantage is that the magnification of the scan unit in the direction of movement of the adjustment by the adjustment speed is determinable. This allows a simple control of the desired Resolution of the scanned image of the page to be scanned in the direction of movement of the adjustment by the change the adjustment speed can be achieved. Usually However, you will be within to achieve equal resolutions orient the template to how big the resolution is the scanned image transverse to the direction of movement of the adjustment is because the magnification of the scan unit across the Movement direction of the adjustment by the imaging optics is determined. Typical values for such resolutions can be in the range of 600 dpi and more.

From It is advantageous if the scanning unit has a line sensor, with the transverse to the direction of movement of the scanning unit sections of to be scanned page of the template are detected. Such a line sensor, the z. B. parallel to the support surface of the wedge-shaped Recording device, on which the side of the original to be scanned rests, aligned and may be formed as a CCD sensor, for example, is proven and has good and reliable properties for such scanning tasks. An alignment of the line sensor parallel to the page to be scanned of the template results in a distortion-free image of the scanned image of the to be scanned Page on the line sensor.

Farther it is conceivable that the scanning unit has an imaging optics, which moves with the scanning unit. This imaging optics, in the simplest Case an imaging lens, is on the adjustment in the beam path between z. B. the line sensor and the side to be scanned Template arranged and ensures a correspondingly accurate illustration the side to be scanned in the plane of the line sensor

From Advantage is when the bearing surface of the wedge-shaped Recording device, on which the side of the original to be scanned rests, a projecting in the direction of the binding of the template chamfer having. This is the tip of the wedge-shaped arrangement the two bearing surfaces designed so that the scanning unit even to the fold between the two opened Pages of the template clean the contents of the page to be scanned can capture and image without edges or distortions disturbed by the transparent support surface to become.

From It is particularly advantageous if the wedge-shaped receiving device in whole or in part, and above all easily replaceable. transparent Materials tend to scratch easily due to frequent use Laying the templates, with such scratches by the here especially flat detection direction of the scanning unit is also particularly strong would affect. Also contain old books often abrasive ingredients such as sand or inks with iron powder, which easily lead to such scratches can. Due to the simple exchange can be scratched Replace pads easily and thus good again optical conditions are produced.

Conceivable is to illuminate the bearing surface of the wedge-shaped Recording device, on which the side of the original to be scanned rests, a line-shaped lighting device, preferably to provide line-arranged LEDs, the light in the direction on the side of the original to be scanned. Such with LEDs equipped lighting devices build on the one hand very small and therefore interfere with the arrangement in the template area the beam path of the scanning unit is not or not essential, moreover they give off only a relatively small amount of waste heat, in particular for longer lasting scans the template thermally inadmissible. Also The waste heat can be adjusted by appropriately arranged Heat sink targeted into the environment and thus of remove the template away.

From Advantage on the uniformity of the illumination the page to be scanned of the template is when the line-shaped Lighting device near the wedge-shaped cradle is arranged. As a result, the lighting device in the vicinity of arranged to be scanned side and thereby occur lower losses on, on the other hand, just in a line-shaped configuration the lighting device, the lighting device are arranged so that it does not affect the beam path of the scanning unit. In another embodiment, it is also conceivable that the line-shaped lighting device near the imaging optics arranged and designed to be movable with the scanning unit.

to Use of the device when placing the pages to be scanned the template, it is conceivable that the device height adjustable over a Work surface is arranged. This allows the device be moved as a whole to match the template to be scanned, so that a corresponding ergonomic for an operator Working attitude results and therefore less tired. in this connection It is also conceivable that the two adjacent sides the open original by hand or over one Pressing device to the wedge-shaped receiving device be pressed, making a partial or complete Automation of scanning is possible.

A particularly preferred embodiment of the invention Device shows the drawing.

It demonstrate:

1 A schematically illustrated arrangement of the components of a device according to the invention during scanning,

2 - The device according to 1 when scanning in the area of the binding back.

In the 1 is a very schematic representation of an arrangement of the components of the device according to the invention 1 shown, from which the geometric and functional assignment of the components of the device 1 is basically recognizable.

A template 3 for example in the form of a book with two sides arranged side by side in the opened state 4 . 6 is on two bearing surfaces 5 . 7 a wedge-shaped receiving device 16 applied, wherein the wedge angle α of the wedge-shaped receiving device 16 only about 30 ° or even less. At least the support surface 5 is transparent and z. B. designed anti-reflective, so that a still further explained scanning unit 17 , above the cradle 16 is arranged, figuratively speaking on the page to be scanned 4 the open template 3 look and this page 4 can scan.

For this purpose, the whole has the item number 17 designated scanning unit a line-shaped sensor 2 , such as a CCD sensor on one of a linear slide 11 . 14 and a drive motor 13 existing adjusting device along the direction of movement 19 controlled movable. The length and position of the adjustment 11 . 13 . 14 is designed so that the line sensor 2 via an only schematically indicated imaging optics 10 along the beam path 8th on the page to be scanned 4 the template 3 look and move along the direction of movement 19 the whole surface of the page to be scanned 4 can scan. Advantageously, the parallel orientation of the direction of movement 19 to the contact surface 5 , but would also be conceivable a non-parallel arrangement, provided that thereby changing imaging conditions on the line sensor 2 be corrected accordingly.

This is the scanning unit 17 so constructed and arranged that the beam path 8th at an angle β relative to the support surface 5 the page to be scanned 4 inclined. As a result, even a small opening angle α of the template is sufficient 3 out, by the pointed wedge angle 15 the cradle 16 is given. Here is the sharp wedge angle 15 the cradle 16 slightly larger than the angle 18 of the beam path 8th based on the support surface 5 the page to be scanned 4 , so at the in 2 illustrated acquisition of the page 4 in the area of the binding spine 20 the page not to be scanned 6 or this half of the template 3 is not in the way and shades the scanning process. Furthermore, the part of the support surface 5 for the page to be scanned 4 on the spine 20 the template 3 to lie, also wedge-shaped 14 Chamfered, hence a picture of the page 4 on the line sensor 2 into the area of the binding spine 20 visually unaffected by the support surface 5 is possible.

Above the cradle 16 is a line-shaped lighting device 9 z. B. in the form of line-shaped LEDs to detect in the direction of the page to be scanned 4 diffuse light as diffusely and evenly as possible, thus ensuring defined lighting conditions. Uneven lighting conditions may be due to editing the scanned image of the page 4 subsequently eliminate. It is also possible, the lighting 9 in the area of the lens 10 with the line sensor 2 moveable to arrange.

The cradle 16 can be two the bearing surfaces 5 . 7 forming separate glass plates or the like. Consist, and the receiving device 16 be formed as a wedge of a transparent solid material. The bearing surface 7 for the page not to be scanned 6 can, but does not have to be made transparent, since due to the imaging geometry only the side 4 the template 3 can be scanned. To scan the page 6 must be the template 3 rotated 180 ° back to the recording device 16 be hung up.

The cradle 16 is easily replaceable on the device 1 held so they are unavoidable scratches on the bearing surfaces 5 . 7 Can be easily replaced to ensure good imaging conditions.

1

contraption

2

line sensor

3

Book / template

4

to scanning side

5

bearing surface page to be scanned

6

Not page to be scanned

7

bearing surface not to be scanned page

8th

beam path

9

lighting device

10

lens

11

linear Guide unit

12

Adjustable slide

13

drive motor

14

chamfer

15

Wedge angle α

16

cradle

17

scan unit

18

angle of coverage

19

Direction of movement β

20

Spines template

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• GB 2158599 A [0004]
• - DE 69629354 T2 [0005]
• - DE 69625163 T2 [0005]
• - DE 69729765 T2 [0005]
• - DE 69423184 T2 [0005]
• US 4567528 [0006]
• US 4567528 B [0010]

Claims (21)

Contraption ( 1 ) for scanning books ( 3 ), Journals or other bound-edge templates ( 3 ), with two adjacent pages ( 4 . 6 ) of the open template ( 3 ) on two flat bearing surfaces ( 5 . 7 ) a wedge-shaped receiving device ( 16 ) are arranged and a scan unit ( 17 ) at least one of the pages ( 4 . 6 ) of the template ( 3 ), characterized in that the detection direction ( 2 . 10 ) of the scanning unit ( 17 ) relative to the plane of the page to be captured ( 4 ) of the template ( 3 ) is arranged at an acute angle (α) and an adjusting unit ( 11 . 13 . 14 ) the scanning unit ( 17 ) relative to the plane of the support surface ( 5 ) on which the page to be scanned ( 4 ) of the template ( 3 ) is present. Contraption ( 1 ) according to claim 1, characterized in that the wedge angle (α) between the flat bearing surfaces ( 5 . 7 ) of the wedge-shaped receiving device ( 16 ) is between 15 ° and 60 °, preferably substantially 30 °. Contraption ( 1 ) according to one of claims 1 or 2, characterized in that the angle (β) of the detection direction ( 2 . 10 ) of the scanning unit ( 17 ) relative to the plane of the page to be captured ( 4 ) of the template ( 3 ) a little sharper than the wedge angle (α) between the flat bearing surfaces ( 5 . 7 ) of the wedge-shaped receiving device ( 16 ). Contraption ( 1 ) according to one of the preceding claims, characterized in that the adjusting unit ( 11 . 13 . 14 ) a linear feed device ( 11 . 14 ) for the scan unit ( 17 ), which the scanning unit ( 17 ) substantially parallel to the plane of the support surface ( 5 ) for the page to be captured ( 4 ) of the template ( 3 ) emotional. Contraption ( 1 ) according to one of the preceding claims, characterized in that the device ( 1 ) only one of the two adjacent pages ( 4 . 6 ) of the open template ( 3 ) scans. Contraption ( 1 ) according to one of the preceding claims, characterized in that the bearing surface ( 5 ) of the wedge-shaped receiving device ( 16 ) on which the page to be scanned ( 4 ) of the template ( 3 ) rests, consists of a transparent material. Contraption ( 1 ) according to claim 6, characterized in that the transparent support surface ( 5 ) of the wedge-shaped receiving device ( 16 ) on which the page to be scanned ( 4 ) of the template ( 3 ) rests, is antireflective. Contraption ( 1 ) according to one of the preceding claims, characterized in that the imaging scale of the scanning unit ( 17 ) in the direction of movement ( 19 ) of the adjustment unit ( 11 . 13 . 14 ) can be fixed by the adjustment speed. Contraption ( 1 ) according to one of the preceding claims, characterized in that the imaging scale of the scanning unit ( 17 ) transverse to the direction of movement ( 19 ) of the adjustment unit ( 11 . 13 . 14 ) through the imaging optics ( 10 ) is determinable. Contraption ( 1 ) according to one of the preceding claims, characterized in that the scanning unit ( 17 ) a line sensor ( 2 ), with which transversely to the direction of movement ( 19 ) of the scanning unit ( 17 ) Sections of the page to be scanned ( 4 ) of the template ( 3 ) are detectable. Contraption ( 1 ) according to claim 10, characterized in that the line sensor ( 2 ) parallel to the support surface ( 5 ) of the wedge-shaped receiving device ( 16 ) on which the page to be scanned ( 4 ) of the template ( 3 ) is aligned. Contraption ( 1 ) according to one of claims 10 or 11, characterized in that the line sensor ( 2 ) is a CCD sensor. Contraption ( 1 ) according to one of the preceding claims, characterized in that the scanning unit ( 17 ) with the line sensor ( 2 ) a resolution of the page to be scanned ( 4 ) of 600 dpi and more. Contraption ( 1 ) according to one of the preceding claims, characterized in that the scanning unit ( 17 ) an imaging optics ( 10 ), which interacts with the scanning unit ( 17 ) emotional. Contraption ( 1 ) according to one of the preceding claims, characterized in that the bearing surface ( 5 ) of the wedge-shaped receiving device ( 16 ) on which the page to be scanned ( 4 ) of the template ( 3 ), one towards the bond ( 20 ) of the template ( 3 ) projecting bevel ( 14 ) having. Contraption ( 1 ) according to one of the preceding claims, characterized in that the wedge-shaped receiving device ( 16 ) is wholly or partially interchangeable. Contraption ( 1 ) according to one of the preceding claims, characterized in that for illuminating the support surface ( 5 ) of the wedge-shaped receiving device ( 16 ) on which the page to be scanned ( 4 ) of the template ( 3 ) rests, a line-shaped lighting device ( 9 ), preferably arranged in a line-shaped LEDs, the light in the direction of the page to be scanned ( 4 ) of the template ( 3 ) radiates. Contraption ( 1 ) according to claim 17, characterized in that the line-shaped lighting device ( 9 ) near the wedge-shaped receiving device ( 16 ) is arranged. Contraption ( 1 ) according to claim 17, characterized in that the line-shaped lighting device ( 9 ) near the imaging optics ( 10 ) and with the scanning unit ( 17 ) is designed to be movable. Contraption ( 1 ) according to one of the preceding claims, characterized in that the device ( 1 ) is arranged vertically adjustable over a work surface. Contraption ( 1 ) according to one of the preceding claims, characterized in that the two adjacent sides ( 4 . 6 ) of the open template ( 3 ) by hand or via a pressing device to the wedge-shaped receiving device ( 16 ) are pressed.