EP1327527A1 - Méthode et dispositif de production d'une image photographique - Google Patents

Méthode et dispositif de production d'une image photographique Download PDF

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Publication number
EP1327527A1
EP1327527A1 EP02000265A EP02000265A EP1327527A1 EP 1327527 A1 EP1327527 A1 EP 1327527A1 EP 02000265 A EP02000265 A EP 02000265A EP 02000265 A EP02000265 A EP 02000265A EP 1327527 A1 EP1327527 A1 EP 1327527A1
Authority
EP
European Patent Office
Prior art keywords
strip
shaped
optical
exposure area
copying material
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.)
Withdrawn
Application number
EP02000265A
Other languages
German (de)
English (en)
Inventor
Beat Dr. Frick
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.)
IMIP LLC
Original Assignee
IMIP LLC
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 IMIP LLC filed Critical IMIP LLC
Priority to EP02000265A priority Critical patent/EP1327527A1/fr
Publication of EP1327527A1 publication Critical patent/EP1327527A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/465—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using masks, e.g. light-switching masks

Definitions

  • the invention relates to a method and an apparatus for producing a photographic Image, especially a copy of one in electronic form Template by exposure of the image information of the template on a strip photographic copying material according to the preambles of the independent claims.
  • Digital imaging devices on a photographic basis so-called digital photographic Printer, create images or copies by exposing the image information the underlying template, available in electronically stored form a photosensitive copying material.
  • One way to do this is by image information the template by means of a suitable electro-optical, pixel-wise working To represent the converter organ optically, i.e. an optical representation to generate the original, and this visual representation of the original on the copy material depict and thereby expose.
  • an electro-optical converter element both active (self-illuminating) and passive (modulating) electro-optical arrangements in question; typical examples are cathode ray tubes, liquid crystal cell fields, light emitting diode fields operated in transmission or reflection, Electroluminescent cell fields and recently also so-called digital micromirror fields.
  • lines or strips can produce photographic images of any size.
  • lines or strips can produce photographic images of any size.
  • the entire Sections of the template covering the template are visually by means of the converter element shown and successively in a corresponding spatial assignment on the copy material exposed onto.
  • the correct spatial arrangement of the exposed strips becomes by exposure of the copy material to the exposure beam path causes.
  • the latter can be done by feeding the copy material or can be achieved by a correspondingly movable imaging optics.
  • the relative offset takes place synchronously with the change of the shown strips of Template. If the stripes are several lines wide, the adjacent ones can Stripes also overlap. Since the copy material depends on the degree of overlap is exposed several times, this must be taken into account when measuring the amount of copy light individual exposure steps are taken into account accordingly.
  • This exposure process is common under the name TIG (Time Integration Grayscale) known.
  • linear converter elements For this method of line-wise or strip-wise exposure, comparative can be use inexpensive linear converter elements. Below that are rectangular Understand transducer element arrangements (fields) whose width is significantly smaller than the length is. In extreme cases, such a linear converter element has only one Row (row) of transducer elements, but typically up to several hundred Series. In the longitudinal direction (per row or row) there is a linear one In contrast, the transducer element typically has a thousand or more transducer elements. Of course can also use wider converter elements (with a higher number of rows) not all rows (i.e. not the full width) are used have to.
  • EP-A-0 986 243 describes an improved method in which the Resolution of the photographic image created by dividing the length of each strip-shaped sections of the template in two or more sections and is achieved by appropriate piecewise exposure. Since this is the full length of the converter element only for the representation of a section is used, results in - in the longitudinal direction of the strips - according to the number Sub-sections a doubling or multiplication of the resolution, so that too with conventional converter organs very large format images with satisfactory Quality can be generated.
  • the present invention is intended to show an alternative way how a method and a device of the generic type improved can be that without much additional technical effort Larger-sized images can be produced in a satisfactory quality in an economical manner are. In particular, this should be done using commercially available and economically justifiable Converter organs may be possible, i.e. there should not be any special, higher resolution ones or larger and correspondingly more expensive converter elements may be required.
  • the transducer element is thus rotated through 45 ° in the imaging beam path, so that the stripe-shaped visual representation of the stripe-shaped sections of the original comes to lie in the diagonal (of the usable area) of the optical transducer element.
  • This rotated arrangement of the optical transducer element according to the invention results in a resolution which is about a factor of 21 ⁇ 2 ( ⁇ 1.4) higher in both dimensions compared to the classic arrangement and thus the possibility of achieving larger image formats with conventional, commercially available transducer elements without sacrificing quality.
  • Figures 1-3 illustrate what is known, for example, from EP-A-0 986 243 and therein Principle of line or strip-shaped described in greater detail Aufbelichtung.
  • the through the total of all stored brightness and Color information for each of its pixels represented is included V denotes.
  • the controller shown in FIG. 6 reads the image information of a first one strip-shaped section A of the template V and thus controls a pixel by pixel working electro-optical converter organ 3, which is based on the supplied to him Signals an imagewise optical representation D of the strip-shaped section A generated.
  • the electro-optical converter element 3 can e.g. through an LED field with e.g.
  • the strip-shaped sections A of the template are not seamless side by side, but they overlap to a large extent (across to their Longitudinal direction).
  • those exposed on the copying material P are also exposed Stripes overlap, the copy material P depending on the degree of overlap is exposed several times.
  • This multiple exposure is taken into account that the brightness values of the individual pixels of the optical representations D of sections A (possibly color-selective) reduced accordingly by the control be so that the copying material acting on the respective pixels Total copy light quantities are correct again.
  • This exposure method is commonly known as TIG (Time Integration Grayscale).
  • the relative movement can also be achieved by moving the imaging optics can be achieved, with the copy material during the entire exposure remains stationary.
  • the principle of such a movable imaging optics is 6 and shown in detail in EP-A-0 986 243 already mentioned.
  • any pixel-wise working, active or passive type can be used. Examples of this are, as already mentioned, cathode ray tubes, light emitting diode fields, electroluminescent fields or Liquid crystal panels.
  • a typical one suitable for the purposes of the invention digital micromirror field comprises an arrangement of 1280 on a chip x 1024 mirrors that are selectively defined between two by electrical control Tilt positions can be pivoted back and forth.
  • micromirror fields are naturally operated in reflection, so they are passive. They are in practical use, as can also be seen in FIG. 6 and in the EP-A-0 986 243, already mentioned, is shown and explained in detail, for example in front of the pupil of an imaging lens that the micromirrors act upon them Light in one tilt position in the imaging lens and in the other Steer the tilt position past the pupil of the imaging lens. The intensity modulation the reflected light is based on the stored image information the template by intermittent control of the micromirrors with the corresponding Duty cycle. Structure, control techniques and possible applications Such digital micromirror fields are in the relevant publications the manufacturer, e.g. from Texas Instruments, Houston, Texas, USA, in Described in detail and are not the subject of the present invention.
  • the resolution in the longitudinal direction of the strip is thus 3 in by the number of individual pixels of the converter element Given in the longitudinal direction.
  • the transducer element 3 such as shown in Figure 4, arranged rotated by 45 ° in the imaging beam path, so that the strip-shaped visual representation D of the strip-shaped sections A of the template V in the diagonal (of the usable area) of the optical Transducer 3 comes to rest.
  • it doesn't become one by any one Number of rectangular pixel areas of the converter element defined by whole lines 3 used for image conversion, but a pixel area that is essentially includes all available lines, but only a part of each line of the available pixels, so that the total number of pixels used for the display cover a strip-shaped area lying in the diagonal of the transducer element.
  • Figure 5 illustrates this.
  • the rotated arrangement of the optical transducer element 3 according to the invention results in a resolution which is about a factor of 21 ⁇ 2 ( ⁇ 1.4) higher in both dimensions compared to the classic arrangement.
  • a display area D with 192 lines of 1919 pixels each. If the display area is chosen to be less high (ie with fewer lines), the number of usable pixels per line is even higher.
  • the transport direction (direction of the relative movement between the strip-shaped exposure area E and the copying material P) by 45 ° to the Lines of the optical converter element 3 rotated.
  • the parallelogram form of for Image representation of the used pixel area, the location of the used pixels on the usable area of the converter element and the 45 ° rotated transport direction a somewhat more complex control of the individual pixels of the converter element, which, however, is readily understandable and realizable for the person skilled in the art.
  • FIG. 6 shows a basic diagram of the device according to the invention.
  • the device comprises the already mentioned memory 1 and the one already mentioned Control 2 and a lighting source 4, the transducer element already mentioned 3 in the form of a micromirror field, one from an objective 5 and three deflecting mirrors 6, 7 and 8 existing imaging optics and symbolized by arrows 9a-9c Drive means for the deflecting mirror and the lens.
  • the two deflecting mirrors 6 and 7 are stationary relative to one another and are at right angles to one another, so that they deflect the beam path by 180 °.
  • the deflection mirror 8 is parallel to Deflecting mirror 7 is arranged and deflects the beam path by 90 ° onto the copying material P.
  • the deflecting mirror 8 moves in the same direction as the two Deflecting mirror 6 and 7, but at twice the speed, so that the optical Path length between the lens 5 and the copy material P regardless of the The position of the deflecting mirror remains constant.
  • the strip-shaped exposure area E over the (Fixed) copy material P moves.
  • the imaging scale can to be changed.
  • the device corresponds completely to e.g. in the already mentioned EP-A-0 986 243 described device and therefore does not require any further explanation.
  • the controller 2 is of course adapted accordingly.
  • the higher resolution achieved according to the invention means that there are no major additional ones technical effort even larger format pictures in satisfactory quality can be produced economically.
  • this is more commercially available and economically justifiable converter elements possible, i.e. there are none special, higher resolution or larger and correspondingly more expensive converter elements required.

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  • Projection-Type Copiers In General (AREA)
EP02000265A 2002-01-15 2002-01-15 Méthode et dispositif de production d'une image photographique Withdrawn EP1327527A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02000265A EP1327527A1 (fr) 2002-01-15 2002-01-15 Méthode et dispositif de production d'une image photographique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02000265A EP1327527A1 (fr) 2002-01-15 2002-01-15 Méthode et dispositif de production d'une image photographique

Publications (1)

Publication Number Publication Date
EP1327527A1 true EP1327527A1 (fr) 2003-07-16

Family

ID=8185195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02000265A Withdrawn EP1327527A1 (fr) 2002-01-15 2002-01-15 Méthode et dispositif de production d'une image photographique

Country Status (1)

Country Link
EP (1) EP1327527A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2561993A3 (fr) * 2011-08-24 2014-01-22 Palo Alto Research Center Incorporated Système d'imagerie à passage unique utilisant un modulateur spatial de lumière et une optique de projection anamorphique
EP2561992A3 (fr) * 2011-08-24 2014-01-22 Palo Alto Research Center Incorporated Système d'imagerie à passage unique utilisant un modulateur spatial de lumière et une optique de projection anamorphique
US8767270B2 (en) 2011-08-24 2014-07-01 Palo Alto Research Center Incorporated Single-pass imaging apparatus with image data scrolling for improved resolution contrast and exposure extent
US8791972B2 (en) 2012-02-13 2014-07-29 Xerox Corporation Reflex-type digital offset printing system with serially arranged single-pass, single-color imaging systems
US8872875B2 (en) 2011-08-24 2014-10-28 Palo Alto Research Center Incorporated Single-pass imaging system with anamorphic optical system
US9354379B2 (en) 2014-09-29 2016-05-31 Palo Alto Research Center Incorporated Light guide based optical system for laser line generator
US9630424B2 (en) 2011-08-24 2017-04-25 Palo Alto Research Center Incorporated VCSEL-based variable image optical line generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04311937A (ja) * 1991-04-11 1992-11-04 Brother Ind Ltd 画像記録装置
JPH05165099A (ja) * 1991-12-13 1993-06-29 Victor Co Of Japan Ltd 表示装置
DE19711243A1 (de) * 1997-03-18 1998-10-01 Wolfgang Deutscher Laser-Druckvorrichtung
US6188426B1 (en) * 1996-05-30 2001-02-13 Fuji Photo Film Co., Ltd. Printer with micromirror device and exposure method therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04311937A (ja) * 1991-04-11 1992-11-04 Brother Ind Ltd 画像記録装置
JPH05165099A (ja) * 1991-12-13 1993-06-29 Victor Co Of Japan Ltd 表示装置
US6188426B1 (en) * 1996-05-30 2001-02-13 Fuji Photo Film Co., Ltd. Printer with micromirror device and exposure method therefor
DE19711243A1 (de) * 1997-03-18 1998-10-01 Wolfgang Deutscher Laser-Druckvorrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 138 (P - 1505) 22 March 1993 (1993-03-22) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 566 (P - 1629) 14 October 1993 (1993-10-14) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2561993A3 (fr) * 2011-08-24 2014-01-22 Palo Alto Research Center Incorporated Système d'imagerie à passage unique utilisant un modulateur spatial de lumière et une optique de projection anamorphique
EP2561992A3 (fr) * 2011-08-24 2014-01-22 Palo Alto Research Center Incorporated Système d'imagerie à passage unique utilisant un modulateur spatial de lumière et une optique de projection anamorphique
US8767270B2 (en) 2011-08-24 2014-07-01 Palo Alto Research Center Incorporated Single-pass imaging apparatus with image data scrolling for improved resolution contrast and exposure extent
US8872875B2 (en) 2011-08-24 2014-10-28 Palo Alto Research Center Incorporated Single-pass imaging system with anamorphic optical system
US9030515B2 (en) 2011-08-24 2015-05-12 Palo Alto Research Center Incorporated Single-pass imaging method using spatial light modulator and anamorphic projection optics
US9630424B2 (en) 2011-08-24 2017-04-25 Palo Alto Research Center Incorporated VCSEL-based variable image optical line generator
US8791972B2 (en) 2012-02-13 2014-07-29 Xerox Corporation Reflex-type digital offset printing system with serially arranged single-pass, single-color imaging systems
US9354379B2 (en) 2014-09-29 2016-05-31 Palo Alto Research Center Incorporated Light guide based optical system for laser line generator

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