WO2000026036A1 - Procede et appareil pour l'impression sur rotative et procede de conversion d'image - Google Patents

Procede et appareil pour l'impression sur rotative et procede de conversion d'image Download PDF

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Publication number
WO2000026036A1
WO2000026036A1 PCT/JP1999/004570 JP9904570W WO0026036A1 WO 2000026036 A1 WO2000026036 A1 WO 2000026036A1 JP 9904570 W JP9904570 W JP 9904570W WO 0026036 A1 WO0026036 A1 WO 0026036A1
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WO
WIPO (PCT)
Prior art keywords
printing
image data
disk
coordinate
medium
Prior art date
Application number
PCT/JP1999/004570
Other languages
English (en)
Japanese (ja)
Inventor
Kenichi Nagai
Yasunori Tsukuda
Norihiro Sawamoto
Original Assignee
Star Micronics Co., Ltd.
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 Star Micronics Co., Ltd. filed Critical Star Micronics Co., Ltd.
Priority to EP99940462A priority Critical patent/EP1125751A4/fr
Priority to KR1020017005465A priority patent/KR20010110295A/ko
Publication of WO2000026036A1 publication Critical patent/WO2000026036A1/fr

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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
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4071—Printing on disk-shaped media, e.g. CDs
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/16—Special spacing mechanisms for circular, spiral, or diagonal-printing apparatus
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/30—Embodiments of or processes related to thermal heads
    • B41J2202/36—Thermal printing on disk-shaped medium

Definitions

  • the present invention overcomes the need for a rotary printing apparatus and method for printing on a disk printing medium such as a CD-R (Compact Disk-Recordable). Further, the present invention relates to an image conversion method for converting rectangular coordinate type image data into rotational coordinate type image data.
  • CD-R Compact Disk-Recordable
  • CD-ROM Read Only Memory
  • CD and CD—R0M is used as a recording side for recording and reading data, and the other side is generally used as a printing side for printing a title or the like.
  • printing is generally performed by a large printing device in order to print large quantities of the same design, whereas in the case of CD-Rs, it is used for small volume publishing and personal use. Or, a small and inexpensive printer that can easily create and change the print content for each sheet has been desired.
  • Such printers include those described in JP-A-5-238005 and JP-A-6-31906.
  • These information recording devices record information on a recording surface of an optical disk from a pickup, and perform ink-jet printing on a printing surface. Printing on an optical disk is performed while moving the ink jet nozzle in the radial direction of the optical disk and rotating the optical disk.
  • Such an information recording apparatus is provided with a mechanism for guiding ink to an ink cartridge and an ink jet head for ink-jet printing. It has a pickup for recording, and the equipment is large and complicated.
  • the inkjet head and the pick aza are provided in the same apparatus, the ink scattered from the inkjet head may adhere to the pickup, thereby preventing information recording.
  • maintenance work such as replacement of ink cartridges and cleaning around the ink-jet head is troublesome.
  • the M-XN orthogonal coordinate type image data handled by a general serial printer / line printer is used as print data as it is. If used, the printing area will be curved in a fan shape along the circumference of the optical disk, and the inner circumference measurement will shrink in the circumferential direction, and the outer circumference will become a distorted image extending in the circumferential direction.
  • the present invention provides a print head for printing in a main scanning direction along a radial direction of a disk print medium
  • Medium rotating means for rotating the disk print medium in a sub-scanning direction along the circumferential direction of the disk print medium
  • Image conversion for converting rectangular coordinate type image data supplied from an external host device into rotational coordinate type image data composed of a plurality of pixels arranged in the main scanning direction and sub-scanning direction of the disk print medium.
  • the printing head is a line type head in which a plurality of recording elements are arranged in a line at a predetermined pitch, and the main scanning direction is at a predetermined angle with respect to the radial direction of the disk printing medium. Preferably they intersect.
  • the printing lines in the main scanning direction intersect at a predetermined angle with the radial direction of the disk print medium, so that the intervals between the printing lines in the sub-scanning direction formed by each recording element are equal to the intersection angle.
  • the gap between the printing lines in the sub-scanning direction can be set to zero.
  • the present invention is configured by a plurality of pixels that arrange the rectangular coordinate type image data supplied from the external host device in the main scanning direction along the radial direction of the disk print medium and the sub-scanning direction along the circumferential direction. While rotating the disk print medium, the image is formed in the main scanning direction of the disk print medium based on the rotated coordinate image data to form an image on the disk print medium.
  • a rotary printing method is provided.
  • the image has the same appearance as the image represented in the rectangular coordinate format.
  • An image can be formed on a disk print medium. Therefore, it is possible to eliminate the curving, stretching, and shrinking of the printed image as in the related art, and to realize a high-quality image.
  • printing in the main scanning direction is performed using a line-type head in which a plurality of recording elements are arranged in a line at a predetermined pitch, and the main scanning direction is in the radial direction of the disk print medium. It is preferable that they intersect at a predetermined angle.
  • the interval between the printing lines in the sub-scanning direction formed by each recording element is determined by the intersection angle Can only be shortened. Furthermore, the printing pixels formed by the recording elements By appropriately setting the length and the crossing angle in the sub-scanning direction, the gap between the printing lines in the sub-scanning direction can be set to zero.
  • the present invention also provides an image conversion method for converting rectangular coordinate type image data into rotational coordinate type image data
  • the image area of the rotational coordinate type image data is arranged in the image area of the rectangular coordinate type image data, and the radial coordinate C defining the pixel position in the radial direction from the center of the rotational coordinate and the pixel position in the circumferential direction from the rectangular coordinate axis are defined.
  • the rotation coordinate point (r, c) is specified using the angular coordinate r to be obtained, and the orthogonal coordinates of the pixel including the rotation coordinate point among the pixels in the rectangular coordinate system are obtained, and the image data of the rectangular coordinate is converted to the rotation coordinate.
  • An image conversion method characterized in that the image data is extracted as (r, c) image data.
  • a circular image area in the rotational coordinate format is arranged in a rectangular image area expressed in the rectangular coordinate format, and the orthogonal coordinates of the pixel including the desired rotational coordinate point (r, c) are calculated.
  • an image having the same appearance as the image represented in the rectangular coordinate format can be formed on the medium.
  • FIG. 1 is a perspective view illustrating a thermal recording system according to the present invention.
  • FIG. 2A is a cross-sectional view showing the structure of a sensitive printing sheet 21 used as the disc printing medium M in FIG. 1, and FIG. 2B is a thermal printing sheet 21 stuck on an optical disc 20.
  • FIG. 3 is a cross-sectional view illustrating a structure of a medium 19.
  • FIG. 3 is a block diagram showing an electrical configuration of the rotary printing apparatus 10.
  • FIG. 4 is a timing chart showing the operation of the rotary printing apparatus 1 °.
  • 5A to 5F are diagrams showing the printing state of the disk printing medium M in a stepwise manner.
  • FIG. 6 is an explanatory diagram showing the first embodiment of the present invention.
  • FIG. 7 is an explanatory diagram showing an image conversion method for converting rectangular coordinate type image data into rotational coordinate type image data.
  • FIG. 8A is a flowchart showing the image conversion method
  • FIG. 8B is a flowchart showing the entire process of the rotation printing.
  • 9A to 9C are explanatory diagrams showing a second embodiment of the present invention.
  • FIG. 10 is an explanatory diagram showing a second embodiment of the present invention.
  • FIG. 11 is an explanatory diagram showing an image conversion method for converting rectangular coordinate type image data into rotational coordinate type image data when the thermal head 11 is arranged obliquely.
  • FIG. 12 is an explanatory diagram of parameters appearing in the calculation formula.
  • FIG. 1 is a perspective view illustrating a thermal recording system according to the present invention.
  • the rotary printing apparatus 10 includes a thermal head 11, a knock-up roller 12, and cathode tubes 13 and 14, and performs printing on a disk printing medium M.
  • the disc printing medium M is a disc-shaped printing medium having a thermosensitive coloring layer that develops a color when heat is applied.
  • the thermal head 11 is a line type thermal head extending in the radial direction of the disk print medium M.
  • the stepping motor 15 drives the disk print medium M to rotate around its axis.
  • Knock-up roller 12 is a roller whose surface is covered with rubber and supports disk printing medium M from the back side in response to pressure from the surface by thermal head 11, and rotates as disk printing medium M rotates. Rotate.
  • the cathode tubes 13 and 14 emit ultraviolet rays having a wavelength for fixing the color forming layer of the disk print medium M.
  • Such a rotary printing apparatus 10 is arranged such that the radial direction of the disk printing medium M is the main scanning direction, the circumferential direction of the disk printing medium M is the sub-scanning direction, and the radial direction and the circumferential direction of the disk printing medium M are Printing is performed by selectively supplying ripening to the pixel regions arranged in a matrix to develop colors.
  • the thermal head 11 in Fig. 1 is scanned along the radial direction of the disk print medium M.
  • Ellipses may be made with possible serial heads.
  • a turntable can be used instead of the backup roller 12 in FIG.
  • FIG. 2A is a cross-sectional view showing the structure of a thermal printing sheet 21 used as the disc printing medium M in FIG. 1, and FIG. 2B is a cross-sectional view of a medium * 19 in which the thermal printing sheet 21 is attached to the optical disc 20. It is sectional drawing which shows a structure.
  • the thermal printing sheet 21 of FIG. 2A has the same cross-sectional structure as the multicolor thermal recording sheet described in JP-A-3-43293 and JP-A-5-69566.
  • a printing method that applies heat to the multicolor sensation recording sheet to develop and print colors is called TA (Thermo-Auto Chrome) method.
  • the rotary printing apparatus 10 of the present embodiment is also a TA-type printing apparatus.
  • the thermal printing sheet 21 has a thermosensitive coloring layer 23 formed on the surface of a base material 22 such as paper, and has a disk-like planar shape.
  • the mature coloring layer 23 includes a yellow coloring layer 23a, a magenta coloring layer 23b, and a cyan coloring layer 23c.
  • Yellow one coloring layer 23 a comprises a yellow dye material and couplers microencapsulated, due to 20 mJ / mm 2 or more thermal energy is applied connection, both reacted passes through the microcapsules Color.
  • the yellow coloring layer 23a is irradiated with ultraviolet light having a wavelength of 420 nm, whereby the unreacted yellow coloring material is decomposed and no more coloring is performed.
  • Magenta coloring layer 23 b comprises a magenta dye material and couplers microencapsulated, 40 m J / mm 2 or more by the fact that heat energy is applied connection, is both transmitted through the microcapsule reaction And develop color.
  • the magenta coloring layer 23b is irradiated with ultraviolet light having a wavelength of 365 nm, the unreacted magenta coloring material is decomposed, and no more color is formed.
  • the cyan coloring layer 23c contains a dye encapsulated in microcapsules, and develops a color when a thermal energy of about 80 mJ / mm 2 or more is applied.
  • the cathode tube 13 emits ultraviolet light having a wavelength of 420 nm in order to fix the yellow coloring layer 23a.
  • the cathode tube 14 emits ultraviolet light having a wavelength of 365 nm to fix the magenta coloring layer 23b.
  • the medium 19 in FIG. 2B is a medium in which a printing sheet 21 is adhered to a printing surface 20 a of an optical disc 20 such as a CDR via an adhesive layer 24.
  • the optical disk 20 is formed by laminating an organic dye layer 25, a reflective layer 26 made of metal, and a protective layer 27 on a polycarbonate substrate 30 in this order.
  • data is recorded by irradiating a laser beam from the recording surface 2b to change the phase of the organic dye layer 25.
  • the optical disc 20 that can be used in the rotary printing apparatus 10 is not limited to such a configuration, and may be, for example, a CD, a CD-ROM, a CD-RW (Rewritable), or the like. Also, a DVD (Digital Video Disk) -ROM, a DVD-RAM (Random Access Memory), a DVD-R.
  • thermosensitive coloring layer 23 may be formed directly on the optical disc 20 by vapor deposition or the like.
  • FIG. 3 is a block diagram illustrating an electrical configuration of the rotary printing apparatus 10.
  • the interface (I / F) 64 performs data transmission with an external host such as a personal computer by parallel communication or serial communication, and receives image data to be printed from the external host, Send status data indicating the operating status.
  • the CPU (Central Processing Unit) 61 operates according to a predetermined program stored in a ROM (Read Only Memory) 62 or the like, and performs signal processing for the thermal head 11, a stepping motor 15, and cathode tubes 13 and 14. It controls the whole operation such as the operation of.
  • the ROM 62 is a nonvolatile memory that stores programs and various data of the CPU 61.
  • the RAM 63 is a volatile memory for storing print data and various data, and also functions as a buffer memory for continuously developing image data. Also, The function of the buffer memory for expanding the data may be performed by the memory of the external host, and the memory capacity of the device 10 may be reduced.
  • FIG. 4 is a timing chart showing the operation of the rotary printing apparatus 10
  • FIGS. 5A to 5F are diagrams showing the printing state of the disk printing medium M in a stepwise manner.
  • print image data created by an external host is transmitted to the thermal head 11 via the I / F 64 and the CPU 61.
  • energization of the stepping motor 15 is started, and the stepping motor 15 rotates the disk printing medium M at a constant rotation speed.
  • FIG. 5A energization of the thermal head / head 11 is started, and ripening energy of the minimum thermosensitive coloring level is applied to the disk printing medium M. As a result, the yellow coloring layer 23a is colored.
  • FIG. 5B when the leading line 73 of the colored region 75 of the yellow primary coloring layer 23a reaches the rear end 71b of the light irradiation region 71, the cathode tube 1 Start energizing 3. Thereby, the light from the cathode tube 13 is irradiated on the disk print medium M.
  • the light irradiation area 71 is an area to which light from the cathode tube 13 is irradiated.
  • the head line 73 reaches the thermal head 11 again, the energization of the thermal head 11 is terminated, and the coloring of the yellow coloring layer 23 a is terminated.
  • FIG. 6 is an explanatory diagram 0 showing the first embodiment of the present invention.
  • the thermal head 11 has a plurality of heat sources arranged in a line, and is arranged along the radial direction of the disk print medium M.
  • the disk print medium M rotates clockwise around the rotation center 0 while rotating. Perform printing operation.
  • the pixel P (c, r) means a pixel specified by the rotational coordinates of the r-th main scanning line and the c-th sub-scanning line
  • HDN indicates the effective printing width in the annular printable area
  • DIN is a numerical value representing the invalid printing width inside the innermost circumference in pixels
  • FIG. 7 is an explanatory diagram showing an image conversion method for converting rectangular coordinate type image data into rotational coordinate type image data.
  • the rectangular image area Q indicating the arrangement of the rectangular coordinate type image data is expressed in a rectangular coordinate format having the X axis in the right direction and the Y axis in the downward direction, with the origin at the upper left corner of the image (0, 0).
  • Such rectangular coordinate type image data is supplied from an external host device.
  • a circular image area U is arranged in order to extract rotational coordinate type image data necessary for printing the disk printing medium M from the image area Q.
  • the square area circumscribing the image area U is defined by points P 1 (X 1, Y 1) and P 2 (X 2, Y 2) of the rectangular coordinates.
  • the area corresponding to the invalid print width on the inner side is unnecessary for printing on the disk printing medium M, and may be excluded.
  • the image data PixelData (c, r) can be expressed as follows using the rectangular coordinates X and Y. [Equation 1]
  • PixelData (c.r) PixelData (X (c, r), Y (c, r))... (1)
  • X (c, r) INT [Xo + L * cos ( ⁇ ) * ⁇ 0.5 * (X2-XI + 1) / (DIN + stroke) ⁇ ]
  • Y (c, r) INT [Yo-sin ( ⁇ ) * ⁇ 0.5 * (Y2-Y1 + 1) / (DIN + stroke)
  • L is a numerical value representing the radius from the rotation center 0 to the pixel P by the number of pixels, and is a counterclockwise rotation from the X-axis direction to the pixel P.
  • INT is a function that rounds down the decimal part of the operation result to an integer.
  • L is calculated by substituting the radial coordinate c into the equation (4), and is calculated by substituting the angle coordinate r into the equation (5).
  • L and are substituted into the equations (1) and (2) to obtain the rectangular coordinates (X, Y) of the pixel including the rotational coordinate point (r, c).
  • the image data of the pixel specified by the rectangular coordinates (X, Y) is extracted as image data PixelData (c, r).
  • FIG. 8A is a flowchart showing the image conversion method
  • FIG. 8B is a flowchart showing the entire process of the rotation printing.
  • step a1 of FIG. 8A in order to secure a buffer area for storing the rotational coordinate type image data, the head address TOP-ADRS of the empty memory area is set in the buffer address Buf-ADRS.
  • steps a2 and a3 the angle coordinate r is set to 1 as a sub-scanning counter, and the radial coordinate c is set to 1 as a main scanning counter.
  • step a4 the rotational coordinates (r, c) are converted into rectangular coordinates (X, Y) using equations (2) to (5), and in step a5, the coordinates are specified by the rectangular coordinates (X, Y).
  • the image data of the pixel is extracted as image data PixelD ata (1, 1) and stored in the buffer address Buf—ADRS memory area.
  • step a6 the buffer address Buf ADRS is increased by one, and step a7 Increases the radial coordinate c by one.
  • the image data up to (HDN, l) is extracted and stored in the buffer.
  • step a9 the angle coordinate r is incremented by one.
  • step b3 the density unevenness caused by the difference between the inner and outer peripheral speeds of the disk print medium M is corrected. This is to eliminate the density unevenness in which the print density on the inner circumference side is high and the print density on the outer circumference side is reduced because the peripheral speed of the disk printing medium M increases from the inner circumference to the outer circumference.
  • step b4 the density unevenness caused by the heat history before starting the printing operation of the thermal head 11 is corrected.
  • FIG. 10 are explanatory diagrams showing a second embodiment of the present invention.
  • the thermal head 11 has a plurality of heating elements arranged in a line, and is arranged obliquely so as to intersect at a predetermined angle with respect to the radial direction of the disk printing medium M. The printing operation is performed while rotating clockwise around the rotation center 0.
  • the heating element 11a has a rectangular shape having a main scanning dimension of 0.105 mm and a sub-scanning dimension of 0.175 mm, the gap between the heating elements 11a is 0.02 mm. Therefore, when the thermal head 11 is arranged in parallel with the radial direction of the disk print medium M, a gap of about 0.02 mm also occurs in the print line in the sub-scanning direction.
  • a total of HDN pixels from pixel P (l, 1) to the innermost pixel P (HDN, 1) are printed.
  • To the innermost pixel P (HDN, 2) are printed.
  • the printing for one cycle is completed.
  • the printing for three cycles is performed corresponding to the three primary colors.
  • the pixel P (c, r) means a pixel specified by the rotational coordinates of the r-th main scanning line and the c-th sub-scanning line
  • HDN denotes the heating element 11 a of the thermal head 11 DN is a numerical value representing the effective printing width in the annular printable area in pixels
  • DIN is a number f representing the invalid printing width inside the innermost circumference in pixels
  • SLN is the number of sub-scanning lines for one round of the disk printing medium. Therefore, a printed image composed of HDNxSLN pixels is formed on one side of the disk printing medium ⁇ .
  • FIG. 11 is an explanatory diagram showing an image conversion method for converting rectangular coordinate type image data to rotational coordinate type image data when the thermal head 11 is obliquely arranged.
  • FIG. 12 is an explanatory diagram of parameters appearing in the calculation formula.
  • a rectangular image area Q indicating the arrangement of rectangular coordinate type image data is expressed in rectangular coordinate format with the X-axis to the right and the ⁇ -axis downward, with the origin (0, 0) at the upper left corner of the image.
  • Such rectangular coordinate type image data is supplied from an external host device.
  • a circular image area U is arranged in the image area Q in order to extract rotational coordinate type image data necessary for printing on the disk printing medium ⁇ .
  • the square area circumscribing the image area U is defined by points ⁇ 1 (XI. ⁇ 1) and ⁇ 2 (X2, ⁇ 2) in rectangular coordinates.
  • the area corresponding to the invalid printing width on the inner side is unnecessary for printing on the disk printing medium ⁇ , and may be excluded.
  • the image data PixelData (c, r) can be expressed as follows using the rectangular coordinates X and Y. [Equation 2]
  • PixelData (cr) PixelData (X (c, r), Y (c, r))... (11)
  • X (c, r) INT [Xo + Ll (c) * cos ⁇ (9 (c, r) ⁇ * ⁇ 0.5 * (X2-XI + 1) / (DIN + DN) ⁇ ]
  • Y (c, r) INT [Yo-Ll (c) * sin ⁇ ( ⁇ 9 (c, r) ⁇ * ⁇ 0.5 * (Y2-Yl + 1) / (DIN + DN) ⁇ ]
  • L2 (c) L4-(c-1) * (L4-DIN) / (HDN-1)... (16)
  • L4 cosa * (DIN + DN)... (18)
  • L1 to L4 are parameters shown in FIG. 12, is a counterclockwise angle from the X-axis direction to the pixel P, and “ This is an angle formed from the rotation center 0 of the outermost pixel P and the innermost pixel P, and INT is a function that rounds down the decimal part of the operation result to convert it to an integer.
  • the radial coordinate c is substituted into the equations (15) to (18), and L1 to 4 are calculated, and the angle coordinate r is calculated by the equation (14). Enter ft and calculate.
  • the image data of the pixel specified by the rectangular coordinates (X, Y) is extracted as image data PixelData (c, r).
  • the image conversion method described above may be executed by the CPU 61 of the rotary printing apparatus, but an external host device such as a personal computer having a high-speed CPU and a large-capacity memory handles image conversion.
  • the obtained rotary coordinate type image data can be transmitted to a rotary printing apparatus.
  • the arrangement pattern of the print pixels is in the rectangular coordinate format. Even if the image changes to a rotating coordinate format, an image having the same appearance as that of the image represented in the rectangular coordinate format can be formed on the disk print medium. Therefore, it is possible to eliminate the curving, stretching, and shrinking of the printed image as in the related art, and realize a high-quality image.
  • the interval between the printing lines in the sub-scanning direction can be set to zero. Printing, and a higher pixel density than the resolution of the print head.

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Abstract

L'invention concerne un dispositif d'impression sur rotative caractérisé en ce qu'il comprend une tête d'impression thermique (11) pour l'impression dans la direction d'alimentation principale ou une direction radiale d'un support d'impression à disque (M) ; un moteur pas à pas (15) pour l'entraînement en rotation du support d'impression à disque dans la direction d'alimentation secondaire ou une direction circonférentielle du support d'impression à disque (M) ; un CPU (61) destiné à convertir les données image en coordonnées cartésiennes fournies par un dispositif hôte extérieur, en données image en coordonnées de rotation composées d'une pluralité de pixels agencés dans les directions d'alimentation principale et secondaire du support d'impression à disque. Le dispositif d'impression selon l'invention imprimeans distorsion une image en coordonnées cartésiennes sur un support à disque.
PCT/JP1999/004570 1998-10-30 1999-08-25 Procede et appareil pour l'impression sur rotative et procede de conversion d'image WO2000026036A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99940462A EP1125751A4 (fr) 1998-10-30 1999-08-25 Procede et appareil pour l'impression sur rotative et procede de conversion d'image
KR1020017005465A KR20010110295A (ko) 1998-10-30 1999-08-25 회전인쇄장치 및 방법 그리고 화상변환방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10311006A JP2000135853A (ja) 1998-10-30 1998-10-30 回転印刷装置および方法ならびに画像変換方法
JP10/311006 1998-10-30

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WO2000026036A1 true WO2000026036A1 (fr) 2000-05-11

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JP (1) JP2000135853A (fr)
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CN1325345A (zh) 2001-12-05
EP1125751A1 (fr) 2001-08-22
KR20010110295A (ko) 2001-12-12
JP2000135853A (ja) 2000-05-16
EP1125751A4 (fr) 2002-01-23

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