公开(公告)号：EP1790485A4

公开(公告)日：2015-09-16

申请号：EP06768002

申请日：2006-07-07

Applicant: CANON KK

Inventor： MURAYAMA YOSHIAKI ,  TAKAHASHI KIICHIRO ,  TESHIGAWARA MINORU ,  EDAMURA TETSUYA ,  MARU AKIKO

IPC: B41J2/21 ,  B41J2/205 ,  B41J11/42

CPC classification number: B41J2/21 ,  B41J11/425 ,  B41J19/147

公开(公告)号：DE60224859T2

公开(公告)日：2009-01-22

申请号：DE60224859

申请日：2002-04-29

Applicant: CANON KK

Inventor： TESHIGAWARA MINORU ,  OTSUKA NAOJI ,  TAKAHASHI KIICHIRO ,  IWASAKI OSAMU

IPC: B41J2/01 ,  B41J19/14

Abstract: A print apparatus that, without significantly reducing an overall printing speed, allows a reduction in uneven densities due to the discharge time difference between black ink and color inks, which occur particularly at both ends in a scanning range and which are caused by the printing by bidirectional scanning of print heads, and enables high image-quality printing to be realized. In this print apparatus, one band is divided into plural areas in a main scanning direction, the dot numbers of black ink and color ink imparted to respective areas are counted. If there are any areas where the dot numbers of both black and color exceed respective threshold values, the area number is counted, and if the number exceeds a predetermined number, the print mode is switched from bidirectional printing to a unidirectional one, upon determining that there is a high probability of occurrence of the above-described uneven densities.

公开(公告)号：DE60228902D1

公开(公告)日：2008-10-30

申请号：DE60228902

申请日：2002-01-30

Applicant: CANON KK

Inventor： TESHIGAWARA MINORU ,  OTSUKA NAOJI ,  SUGIMOTO HITOSHI ,  TAKAHASHI KIICHIRO ,  NISHIKORI HITOSHI ,  IWASAKI OSAMU ,  YAZAWA TAKESHI ,  CHIKUMA TOSHIYUKI

IPC: B41J2/21

Abstract: A printing apparatus can reduce degradation in print quality of a printed image, notably in a highlight portion or an intermediate gradation portion in the case where the image is printed by forming dots of a plurality of sizes. Specifically, data (C) and (SC) causing larger and smaller cyan ink droplets, respectively, to be ejected are independently subjected to a conversion to n-value process. Thus, the data (C) for larger ink droplets is present in a portion of printing data (128 or more) which corresponds to the highlight portion or intermediate gradation portion of the image. During printing, larger dots are formed in this area, thereby making it difficult to perceive possible stripes caused by the offset of the positions at which smaller dots impact a sheet.

公开(公告)号：DE60323313D1

公开(公告)日：2008-10-16

申请号：DE60323313

申请日：2003-10-02

Applicant: CANON KK

Inventor： TAKAHASHI KIICHIRO ,  IWASAKI OSAMU ,  TESHIGAWARA MINORU

IPC: B41J2/05 ,  B41J2/07 ,  B41J2/21 ,  G06K15/10

Abstract: The method involves generating printing data to be printed by each of two adjacent printing nozzle arrays on basis of tone information of image data to be printed. The printing data is generated in a range in which a sum of number of dots to be printed by two arrays does not exceed a predetermined number. Ink is discharged to a pixel of printing medium from the arrays on basis of the printing data generated. Independent claims are also included for the following: (a) an ink-jet printing apparatus (b) a program to control an ink-jet printing apparatus.

公开(公告)号：DE69939194D1

公开(公告)日：2008-09-11

申请号：DE69939194

申请日：1999-04-06

Applicant: CANON KK

Inventor： TESHIGAWARA MINORU ,  NISHIKORI HITOSHI ,  OTSUKA NAOJI ,  IWASAKI OSAMU ,  TAKAHASHI KIICHIRO ,  CHIKUMA TOSHIYUKI

IPC: B41J2/01 ,  B41J29/393 ,  B41J2/05 ,  B41J2/21 ,  B41J2/51 ,  B41J2/525 ,  B41J19/14

Abstract: In a complimentary printing by bi-directional scanning of a head (1) or by a plurality of heads, a plurality of patterns in which a print start timing is shifted by a predetermined amount are printed with respect to a reference dot formed by the forward scan of the bi-directional scanning or by one of the plurality heads (S1). In these patterns, an area factor by the dots formed by printing of the patterns is designed to be varied depending upon shifting amount. An average density is read from each of the plurality of patterns, optically (S2). The timing at which the maximum one among average densities read from the patterns is obtained, can be set as the printing registration condition (S3). Further, before the above reading operation, an optical sensor used for this operation is calibrated, for improving accuracies of the reading and the registrating. By these processings, printing registration between a forward and a reverse scan of a print head or printing registration between a plurality of print heads in a printing apparatus can be performed simply and with high accuracy.

公开(公告)号：DE60224601D1

公开(公告)日：2008-03-06

申请号：DE60224601

申请日：2002-01-30

Applicant: CANON KK

Inventor： YAZAWA TAKESHI ,  OTSUKA NAOJI ,  SUGIMOTO HITOSHI ,  TAKAHASHI KIICHIRO ,  NISHIKORI HITOSHI ,  IWASAKI OSAMU ,  TESHIGAWARA MINORU ,  CHIKUMA TOSHIYUKI ,  SEKI SATOSHI

IPC: B41J2/14 ,  B41J2/145 ,  B41J2/165

Abstract: A liquid ejection head (13) according to the present invention comprises a single liquid supplying port (18) to which a liquid is supplied, a plurality of liquid supplying passages (17a and 17b) having one end in communication with the liquid supplying port (18), a plurality of common liquid chambers (16a and 16b) that are in communication with the other ends of the liquid supplying passages (17a and 17b), respectively, and a plurality of ejection port groups which are in communication with the common liquid chambers (16a and 16b) via liquid channels and from which liquid droplets are ejected. A cross sectional area or length of the liquid supplying passage (17a) in communication with the ejection port group having a larger sum of opening areas of the ejection ports is set smaller or longer respectively than that of the liquid supplying passage (17b) that is in communication with the ejection port group having a smaller sum of opening areas of the ejection ports.

公开(公告)号：DE69930471D1

公开(公告)日：2006-05-11

申请号：DE69930471

申请日：1999-04-06

Applicant: CANON KK

Inventor： TAKAHASHI KIICHIRO ,  OTSUKA NAOJI ,  NISHIKORI HITOSHI ,  IWASAKI OSAMU ,  TESHIGAWARA MINORU ,  CHIKUMA TOSHIYUKI

IPC: B41J2/21 ,  B41J2/505 ,  B41J19/14

Abstract: In a complimentary printing by bi-directional scanning of a head (1) or by a plurality of heads, a plurality of patterns in which a print start timing is shifted by a predetermined amount are printed with respect to a reference dot, e.g. formed by the forward scan of the bi-directional scanning or by one of the plurality heads (S1). In these patterns, an area factor by the dots formed by printing of the patterns is designed to be varied depending upon shifting amount. An average density is read from each of the plurality of patterns, optically (S2). The timing at which the maximum one among average densities read from the patterns is obtained, can be set as the printing registration condition (S3, S4). Further, a processing including a coarse adjustment (S104, S105, S108) to a fine adjustment (S107, S109) is performed in a series of algorithm. By these processings, printing registration between a forward and a reverse scan of a print head or printing registration between a plurality of print heads in a printing apparatus can be performed simply and with high accuracy, without operating by a user.

公开(公告)号：DE602005024637D1

公开(公告)日：2010-12-23

申请号：DE602005024637

申请日：2005-06-07

Applicant: CANON KK

Inventor： OSHIO NAOMI ,  TESHIGAWARA MINORU ,  TAKAHASHI KIICHIRO ,  OTSUKA NAOJI

IPC: B41J2/165 ,  B41J2/18 ,  B41J2/17 ,  B41J2/185 ,  B41J19/20 ,  B41J29/38

公开(公告)号：DE602006013728D1

公开(公告)日：2010-06-02

申请号：DE602006013728

申请日：2006-02-17

Applicant: CANON KK

Inventor： TAKAHASHI KIICHIRO ,  OTSUKA NAOJI ,  IWASAKI OSAMU ,  TESHIGAWARA MINORU ,  EDAMURA TETSUYA ,  NAKAGAWA YOSHINORI ,  SEKI SATOSHI ,  OSHIO NAOMI

IPC: B41J2/21 ,  B41J19/14

公开(公告)号：DE69941046D1

公开(公告)日：2009-08-13

申请号：DE69941046

申请日：1999-10-26

Applicant: CANON KK

Inventor： TESHIGAWARA MINORU ,  OTSUKA NAOJI ,  TAKAHASHI KIICHIRO ,  NISHIKORI HITOSHI ,  IWASAKI OSAMU ,  CHIKUMA TOSHIYUKI

IPC: B41J2/01 ,  B41J2/21 ,  B41J2/205 ,  B41J2/51 ,  B41J19/14 ,  B41J19/18

Abstract: In the case where an image is formed with a mixture of large and small droplets by bi-directional printing in an ink jet printing apparatus in which ink is ejected in the form of, e.g., a droplet for printing operation while scanning by a print head (1), misalignment caused by a difference in ejection speed between the large and small droplets is prevented. For this purpose, there is provided a printing registration method according to the present invention comprises the steps of forming reference dots with the large and small droplets in forward scan printing, forming shifted dots in reverse scan printing on changed registration conditions, acquiring a adjustment value of the condition of dot forming positions on the basis of optical characteristics according to a plurality of shifting amounts of the relative printing positions between forward scanning and reverse scanning, controlling the order of formation of the large and small dots in the forward scanning and the reverse scanning, and correcting the adjustment value according to the offset amount of the small dot forming positions on the basis of the difference in ejection speed or the like.