WO2004089637A1 - 両面印刷装置 - Google Patents
両面印刷装置 Download PDFInfo
- Publication number
- WO2004089637A1 WO2004089637A1 PCT/JP2004/004925 JP2004004925W WO2004089637A1 WO 2004089637 A1 WO2004089637 A1 WO 2004089637A1 JP 2004004925 W JP2004004925 W JP 2004004925W WO 2004089637 A1 WO2004089637 A1 WO 2004089637A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- image
- image data
- data
- density
- printing
- Prior art date
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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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
- B41L13/00—Stencilling apparatus for office or other commercial use
- B41L13/04—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers
- B41L13/06—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers with a single cylinder carrying the stencil
Definitions
- the present invention relates to a two-sided printing apparatus that performs printing on the front and back surfaces of printing paper, and more particularly to a two-sided printing apparatus that can prevent “through-through” when performing two-sided printing.
- double-sided printing in which printing is performed on both sides of printing paper, has been increasingly performed in order to reduce the amount of printing paper used.
- stencil printing where single-sided printing was common in the past, double-sided printing is often performed.
- a two-sided printing device that can perform double-sided printing in one printing process has been developed. Is being developed.
- a cylindrical first plate cylinder and a second plate cylinder having stencil paper wound on the outer peripheral surface are arranged adjacent to each other so that their rotation axes are parallel to each other.
- the printing paper is fed between the first and second plate cylinders, and the first and second plate cylinders pinch and convey the printing paper, so that the stencil paper is applied to both sides of the printing paper.
- An apparatus for transferring the passed ink is proposed in Japanese Patent Application Laid-Open No. 2001-180998. In such a double-sided printing apparatus, printing can usually be performed by switching between single-sided printing and double-sided printing.
- the ink that exceeds the amount of ink that can be held by the printing paper is transferred to the printing paper, which may cause “ink-through” in which the ink escapes on the back side of the printing paper.
- “through strikethrough” is likely to occur.
- this“ through strike-through ”′ tends to occur. If this “through print” occurs during double-sided printing, the printed content printed on the reverse side of the printing paper and the “printed through” print content will overlap, making it difficult to understand the printed content and reducing the quality of the printed material. It is severely impaired.
- Japanese Patent Application Laid-Open No. 2000-190610 discloses a stencil sheet for performing double-sided printing.
- a double-sided printing apparatus has been proposed which reduces the printing density during double-sided printing by making the hole diameter at the time of plate making smaller than the hole diameter at the time of plate making of stencil paper for performing one-sided printing.
- the double-sided printing apparatus is a double-sided printing apparatus that performs printing on the front and back sides of printing paper, and includes image density detection means for detecting image densities of input front side image data and back side image data.
- image density detection means detects an image density of a predetermined density or more from at least one of the image data of the front surface and the image data of the back surface, the image data of the front surface and the image data of the back surface are printed.
- a print density reducing means for reducing both print densities.
- the image density detecting means includes a predetermined area in an image represented by the image data as the image density. The ratio of the number of black data to the total number of image data may be detected.
- the image density detecting means may include a thinning processing means for performing a thinning process on the image data on the front surface and the image data on the back surface. If the image density detecting means divides the image represented by the image data into a plurality of areas and detects the image density for each area, the print density reducing means may include a method for reducing the print density in the area. The print density may be reduced when the image density detected in at least one of the areas is equal to or higher than a predetermined density.
- the image density detecting means detects image densities of image data of all pages input in the set when image data of at least three pages or more is input in the set.
- the print density reducing means includes: If the image density of at least a predetermined density is detected from the image data of one page, the print density at the time of printing the image data of all pages may be reduced.
- FIG. 1 is a stencil printing apparatus according to an embodiment of the present invention.
- Figure 2 is a schematic configuration diagram of the control unit.
- FIG. 3 is a flowchart illustrating an operation flow in the control unit.
- FIG. 1 is a schematic configuration diagram of a stencil printing apparatus according to an embodiment of the present invention
- FIG. 2 is a schematic configuration diagram of a control unit 90.
- the stencil printing machine is a stencil printing machine capable of single-sided printing and double-sided printing, and has an image reading section 10 for reading an image of an original 1 and an image reading section 10 for reading.
- the paper supply unit 30 for supplying the printing paper 3, and printing on the printing paper 3 using the stencil sheet 2a.
- the second plate cylinder 40b, the discharge section 50 for discharging the printed printing paper 3, the first plate discharge section 60a for discarding the stencil sheet 2a, and the second section for discarding the stencil sheet 2b A plate discharge unit 60, an input unit 70 for setting the number of prints, selecting one-sided printing or two-sided printing, and a display unit 80 for displaying the setting status, etc. And a control unit 9 0 for controlling the operation of each portion is continued.
- the image reading unit 10 includes a document table 11 for reading an image of the document 1, a document supply unit 12 that automatically supplies the document 1 to the document reading position of the document table 11, and a reading unit. 1 and 3.
- the reading unit 13 includes an image sensor 14 and a reciprocating unit 15 including a belt bully for reciprocating the image sensor 14.
- the image sensor 14 reads the image of the original 1 while moving below the original 1 placed at the original reading position, and outputs an electric signal (hereinafter referred to as a read signal) carrying information of the original image to the controller 9. Output to 0 I do. .
- the first stencil making section 20a stores a stencil sheet 2a in the form of a stencil, and stores a stencil section 23a composed of a thermal head 21a and a platen roller 22a, and a stencil sheet 2a. It has a transport section 24a for transporting and a force cutter 25a for cutting the stencil sheet 2a.
- the stencil sheet 2a is pierced by the thermal head 21a and the platen roller 22a to perform stencil making based on stencil data described later.
- the perforated stencil sheet 2a is conveyed by the conveying section 24a, cut by the cutter 25a, and sent to the first plate cylinder 40a.
- the second plate making section 20b has almost the same configuration as the first plate making section 20a, with a force S different in installation position and direction. A detailed description of the configuration is omitted.
- the paper feed unit 30 includes a paper feed tray 3 1 on which the printing paper 3 is loaded, a paper feed roller 3 2 for taking out the printing paper 3 one by one from the paper feed tray 3 1 and a paper separating roller 3 3, and a printing paper. And a pair of timing rollers 34 for feeding the roller 3 between the first plate cylinder 40a and the second plate cylinder 40b at a predetermined timing.
- the first plate cylinder 40a has an ink-permeable peripheral wall 41a, and is driven to rotate about a shaft 42a by driving means (not shown). Inside the first plate cylinder 40a, an ink supply means 43a is provided inside the first plate cylinder 40a.
- the ink supply means 43a is provided with an ink supply roller 44a in contact with the inner peripheral surface of the peripheral wall 41a and a predetermined amount of ink supplied by an ink supply pipe (not shown) to the ink supply roller 44a. Tar rollers 45a.
- a clamp portion 46a for holding the leading end of the stencil paper 2a is provided on the outer peripheral surface of the peripheral wall 41a of the first plate cylinder 40a.
- the stencil sheet 2a produced by the first plate making section 20a is held at its leading end by the clamp section 46a, and is rotated by the rotation of the first plate cylinder 40a on the outer peripheral surface of the peripheral wall 41a. Wound.
- a pressing mechanism 47a for moving the ink supply roller 44a up and down is provided inside the first plate cylinder 40a.
- the second plate cylinder 40b has almost the same configuration except that it is installed upside down with the first plate cylinder 40a. The description of the configuration is omitted.
- the printing paper 3 is sandwiched between the first plate cylinder 40a and the second plate cylinder 40b and printed. Printing is performed. Even if the first plate cylinder 40a and the second plate cylinder 40b are rotated while the printing paper 3 is not being fed, the first plate cylinder should not touch the cylinders directly. A slight gap is provided between 40a and the second plate cylinder 40b.
- the ink supply roller is lowered by the pressing mechanism toward the outer peripheral surface of the first plate cylinder 40a, and the outer peripheral surface of the first plate cylinder 40a is inward. Press down from. As a result, the outer peripheral surface of the first plate cylinder 40a contacts the front surface of the printing paper 3, and the outer peripheral surface of the second plate cylinder 40b contacts the back surface. Double-sided printing is performed while each plate cylinder rotates to pinch and convey the printing paper 3.
- the paper discharge unit 50 includes a paper separation claw 51 that separates the printed printing paper 3 from the first plate cylinder 40a and the second plate cylinder 40b, and a paper discharge unit 52 that conveys the print paper 3. And a discharge tray 53 on which the transported printing paper 3 is stacked and placed.
- the paper output section 52 includes a plurality of pinch roller pairs 54 driven at a constant speed by a drive motor (not shown), and the printing paper 3 is provided between the upstream pinch roller pair 54 and the downstream pinch roller pair 5. It is transported by being delivered to 4.
- the first plate discharging section 60a is provided in the vicinity of the first plate cylinder 40a, and a base paper separating claw (not shown) for peeling the used stencil sheet 2a from the first plate cylinder 40a; It has a pair of stencil discharge rollers 61a for taking in and transporting the stencil 2a peeled off from the plate cylinder 40a, and a stencil discharge box 62a for accommodating the used stencil 2a that has been transported.
- the second plate discharging section 60b has almost the same configuration as the first plate discharging section 60a, although the installation position and the direction are different. A detailed description of the configuration is omitted. As shown in FIG.
- the control unit 90 performs image processing such as A / D conversion and binarization processing on the read signal output from the image reading unit 10 to create a stencil sheet.
- An image data generating unit 91 for generating image data of the image data, an image memory 92 for storing the image data generated by the image data generating unit 91, and a stencil based on the image data stored in the image memory 92.
- a stencil data generation unit 93 for generating data and outputting the data to the stencil unit 23a and the stencil unit 23b is provided.
- the stencil data generation unit 93 detects whether or not the image density of the image data is equal to or higher than a predetermined value when double-sided printing is selected. It has a detection unit 94. Also, as shown in FIG.
- the control unit 90 includes an image reading unit 10, a first plate making unit 20a, a second plate making unit 20b, a paper feeding unit 30, a first plate cylinder 40a, and a 2 Plate cylinder 40 b, paper discharge unit 50, 1st plate discharge unit 60a, 2nd plate discharge unit 60b, input unit 70 and display unit 80
- the stencil data generation unit 93 includes a function as a print density reduction unit of the present invention.
- the operation of the stencil printing machine will be described below.
- the user selects from the input unit 70 whether to perform single-sided printing or double-sided printing.
- the operation when single-sided printing is selected will be briefly described.
- the original 1 When performing single-sided printing, set one document in the document feeder 12. Under the control of the control unit 90, the original 1 is placed from the original supply unit 12 to the original reading position of the original placing table 11 and the image of the original 1 is read by the image sensor 14, and the read signal is transmitted to the control unit. Output to 9 0.
- the image data generation section 91 performs AZD conversion and normal image processing to generate image data, and stores it in the image memory 92.
- the stencil data generation unit 93 generates stencil data based on the image data stored in the image memory 92, and outputs the stencil data to the stencil unit 23a.
- the heat generation state of the thermal head 2la is controlled based on the stencil data, and the stencil sheet 2a is made.
- the perforated stencil sheet 2a is conveyed by a conveying section 24a, cut into a predetermined size by a cutter 25a, and wound around a first plate cylinder 40a. Thereafter, the printing paper 3 is fed from the paper feeding unit 30 and single-sided printing is performed.
- the user sets two originals in the original supply unit 12.
- the first sheet (for the front side) of the original 1 is first placed from the original supply unit 12 to the original reading position of the original mounting table 11 and the image of the original 1 is read by the image sensor 14. And a read signal is output to the control unit 90.
- the second document 1 (for the back side) is placed from the document feeder 12 onto the document reading position of the document table 11, and the image of the second document 1 is read by the image sensor 14. And The read signal is output to the control unit 90.
- step 101 the input read signal is A / D-converted in the image data generation section 91, and then the image data is generated by performing normal image processing and stored in the image memory 92. That is, the image data for the front side and the image data for the back side are stored in the image memory 92.
- the stencil data generation unit 93 reads a predetermined area in the image represented by the image data stored in the image memory 92, for example, 100 lines from the image memory 92.
- the image data of the minute area is read. Since this image data has been subjected to the binarization processing, it is composed of black data (ON dots) and white data (OFF dots).
- step 103 the image density detector 94 calculates the image data density A of the image data in the area corresponding to the 100 lines as a percentage of the total number of black data relative to the total number of data.
- step 104 the stencil data generation unit 93 determines whether or not the image density A is 30% or less. If the image density A is 30% or less, the process proceeds to step 105. If the ratio of the number of black data exceeds 30%, go to step 107.
- step 105 it is determined whether or not reading of all the image data stored in the image memory 92, that is, the image data of the front surface and the back surface has been completed. If not, the process returns to step 102 to read the next 100 lines of image data. If completed, go to step 106.
- step 106 normal stencil data is generated based on the front side image data and the back side image data stored in the image memory 92.
- the generated stencil data on the front surface is output to the stencil portion 23a, and the stencil data on the back surface is output to the stencil portion 23b.
- the image density A does not exceed 30% in any region of the image data. That is, when proceeding to step 106, the image displayed on the front side and the image data on the back side are displayed.
- the image displayed by the data can be considered to be almost composed of characters. For this reason, even if duplex printing is performed using the image data of the front surface and the image data of the back surface as they are, there is little possibility that “through strike-through” occurs, and it is not necessary to reduce the print density.
- the stencil data generation unit 93 applies a thinning process as a print density reduction process to the front side image data and the back side image data stored in the image memory 92 to generate stencil data.
- the stencil data on the front side subjected to the thinning process is output to the stencil portion 23a
- the stencil data on the back surface subjected to the thinning process is output to the stencil portion 23b.
- Specific examples of the thinning process include a process of forcibly converting to white data for every two pixels in the main scanning direction and the sub-scanning direction. By performing such processing, if it is originally white data, stencil data is generated as it is as white data. For example, in a solid portion where black data is continuous, black data and white data are combined in a grid pattern. After being converted to the provided data, stencil data is generated.
- step 107 When proceeding to step 107, at least a part of the image displayed by the image data of the front surface and the image displayed by the image data of the back surface has an area where the image density A exceeds 30 ° / 0. are doing. In other words, some parts are not characters. If double-sided printing is performed using the image data of the front surface and the image data of the back surface as they are, there is a possibility that "through strike-through” may occur. On the other hand, if the stencil data is created by performing the thinning process as described above, the print density is reduced, so that “through-through” does not occur.
- the heat generation state of the thermal head is controlled in the stencil portion 23a based on the stencil data on the surface, and the stencil sheet 2a is made.
- the perforated stencil sheet 2a is conveyed by a conveying section 24a, cut into a predetermined size by a cutter 25a, and wound around a first plate cylinder 40a.
- the heat generation state of the thermal head is controlled based on the stencil data on the back surface, and the stencil sheet 2b is made.
- the perforated stencil sheet 2b is conveyed by a conveying section 24b, cut into a predetermined size by a cutter 25b, and wound around a second plate cylinder 40b.
- pay Printing paper 3 is fed from paper unit 30 and double-sided printing is performed up to a preset number.
- the image density detection unit 94 detects image density of a predetermined density or more from at least one of the front side image data and the back side image data, the front side image data and the back side image data are detected. Since the print density at the time of printing the image data on the back side can be reduced, it is possible to prevent the occurrence of “through-through” and to execute the double-sided printing without giving a feeling of strangeness to the user. In addition, by reducing the print density, the ink is transferred to the printing paper placed above or below when it is placed on the paper output tray. Can be.
- the image density can be easily detected.
- the print density is reduced by performing the thinning process on the image data on the front side and the image data on the back side to generate the stencil data, the print density can be easily reduced.
- the image represented by the image data is divided into regions for each 100 lines, and the image density is detected for each region. At least one of the regions for each 100 lines is detected. If the detected image density is equal to or higher than the predetermined density, the print density is reduced. Can be prevented.
- the thinning process is performed to reduce the print density.
- the print density may be reduced by any method. For example, the heat generation energy of the thermal head may be controlled to reduce the hole diameter. Further, halftone processing may be performed in addition to the thinning processing.
- a stencil printing apparatus is used, but the printing apparatus is not limited to this, and may be any printing apparatus.
- an ink jet printing device may be used.
- a method of reducing the print density a method of performing the same thinning processing as in the embodiment, a method of reducing the ink ejection amount, or the like can be used.
- the print density is detected for each of the front and back two pages, and if the image density of a predetermined density or more is detected from at least one of the front side image data and the back side image data, the two pages of the front and back are detected.
- the print density of the image data may be reduced, or the print density of all pages may be detected before printing, and if an image density of at least a predetermined density is detected from the image data of at least one page, The print density may be reduced when printing image data of all pages. If it reduces the print density of all pages, perform double-sided printing that prevents the occurrence of “through printout” and that unifies the print density of all pages and that does not give the user any more uncomfortable feeling. Can be.
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- Dot-Matrix Printers And Others (AREA)
- Record Information Processing For Printing (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/552,323 US20060283343A1 (en) | 2003-04-08 | 2004-04-05 | Perfecting press device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003104036A JP2004306462A (ja) | 2003-04-08 | 2003-04-08 | 両面印刷装置 |
JP2003-104036 | 2003-04-08 |
Publications (1)
Publication Number | Publication Date |
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WO2004089637A1 true WO2004089637A1 (ja) | 2004-10-21 |
Family
ID=33156840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/004925 WO2004089637A1 (ja) | 2003-04-08 | 2004-04-05 | 両面印刷装置 |
Country Status (3)
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US (1) | US20060283343A1 (ja) |
JP (1) | JP2004306462A (ja) |
WO (1) | WO2004089637A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007045121A (ja) * | 2005-08-12 | 2007-02-22 | Tohoku Ricoh Co Ltd | 部品交換時期延長方法、製版装置、印刷装置および画像形成装置 |
JP5069896B2 (ja) * | 2006-10-23 | 2012-11-07 | 株式会社小森コーポレーション | 液体供給装置 |
JP4882728B2 (ja) * | 2006-12-20 | 2012-02-22 | セイコーエプソン株式会社 | 情報処理装置、情報処理方法、記録装置、記録方法およびプログラム |
JP5328390B2 (ja) * | 2009-01-27 | 2013-10-30 | 理想科学工業株式会社 | 両面孔版印刷装置 |
JP5320205B2 (ja) * | 2009-08-03 | 2013-10-23 | 理想科学工業株式会社 | 画像データ生成方法および装置並びに印刷装置 |
JP5457757B2 (ja) * | 2009-08-17 | 2014-04-02 | 理想科学工業株式会社 | 画像データ生成方法および装置並びに孔版印刷装置 |
JP5537087B2 (ja) * | 2009-08-17 | 2014-07-02 | 理想科学工業株式会社 | 画像データ生成方法および装置並びに孔版印刷装置 |
JP4952756B2 (ja) * | 2009-08-31 | 2012-06-13 | ブラザー工業株式会社 | 印刷装置 |
JP2011077993A (ja) * | 2009-10-01 | 2011-04-14 | Riso Kagaku Corp | 画像形成装置 |
JP2011083909A (ja) * | 2009-10-13 | 2011-04-28 | Riso Kagaku Corp | 画像処理装置 |
JP5398584B2 (ja) * | 2010-02-26 | 2014-01-29 | キヤノン株式会社 | 印刷制御装置、方法及びプログラム |
US8540441B2 (en) | 2010-03-24 | 2013-09-24 | Canon Kabushiki Kaisha | Printing control apparatus and printing control method |
JP5745889B2 (ja) * | 2011-02-22 | 2015-07-08 | 理想科学工業株式会社 | 画像データ生成装置及び画像データ生成方法 |
JP5858724B2 (ja) * | 2011-10-21 | 2016-02-10 | キヤノン株式会社 | 搬送装置 |
JP6219697B2 (ja) * | 2013-11-28 | 2017-10-25 | 株式会社沖データ | 画像形成方法及び画像形成装置 |
Citations (6)
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JPH0522582A (ja) * | 1991-07-15 | 1993-01-29 | Riso Kagaku Corp | 画像処理装置 |
JPH11205596A (ja) * | 1998-01-07 | 1999-07-30 | Canon Inc | 画像形成装置および方法 |
JPH11227178A (ja) * | 1998-02-12 | 1999-08-24 | Oki Data Corp | インクジェット印刷装置 |
JP2000059630A (ja) * | 1998-08-07 | 2000-02-25 | Ricoh Co Ltd | 画像記録方法及び画像記録プログラムを記録した媒体 |
JP2001310506A (ja) * | 2000-04-28 | 2001-11-06 | Seiko Epson Corp | 印刷データ作成装置およびその動作プログラムを記憶した記憶媒体 |
JP2003025703A (ja) * | 2001-07-11 | 2003-01-29 | Tohoku Ricoh Co Ltd | 孔版印刷装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6505551B1 (en) * | 1999-10-05 | 2003-01-14 | Riso Kagaku Corporation | Stencil printing machine having means to hold both ends of stencil sheet |
US6464334B2 (en) * | 2001-01-08 | 2002-10-15 | Hewlett-Packard Company | Method for improving the quality of printing processes involving black pixel depletion |
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2003
- 2003-04-08 JP JP2003104036A patent/JP2004306462A/ja active Pending
-
2004
- 2004-04-05 WO PCT/JP2004/004925 patent/WO2004089637A1/ja active Application Filing
- 2004-04-05 US US10/552,323 patent/US20060283343A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0522582A (ja) * | 1991-07-15 | 1993-01-29 | Riso Kagaku Corp | 画像処理装置 |
JPH11205596A (ja) * | 1998-01-07 | 1999-07-30 | Canon Inc | 画像形成装置および方法 |
JPH11227178A (ja) * | 1998-02-12 | 1999-08-24 | Oki Data Corp | インクジェット印刷装置 |
JP2000059630A (ja) * | 1998-08-07 | 2000-02-25 | Ricoh Co Ltd | 画像記録方法及び画像記録プログラムを記録した媒体 |
JP2001310506A (ja) * | 2000-04-28 | 2001-11-06 | Seiko Epson Corp | 印刷データ作成装置およびその動作プログラムを記憶した記憶媒体 |
JP2003025703A (ja) * | 2001-07-11 | 2003-01-29 | Tohoku Ricoh Co Ltd | 孔版印刷装置 |
Also Published As
Publication number | Publication date |
---|---|
US20060283343A1 (en) | 2006-12-21 |
JP2004306462A (ja) | 2004-11-04 |
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