摘要:
For a serial color ink jet printing apparatus that forms an image using a symmetric printing head that ejects large dots and small dots, the configuration of a printing head is provided for suppressing, to the extent possible, a cyclic fluctuation in the main scanning direction. According to the present invention, individual nozzle arrays are arranged so that two nozzle arrays, i.e., a cyan nozzle array c1 and a magenta nozzle array m1, that are located nearer each other, form dots on adjacent scan lines. With this arrangement, a high quality image, having neither an uneven density nor an uneven color, can be formed when a printing head is inclined, or when a cyclic shift in printing positions occurs, depending on the position of the main scanning direction.
摘要:
According to the present invention, an adjustment value applicable to the adjustment of a printing position is obtainable by reading a printing position adjustment pattern printed on a printing medium without requiring the manual operation by the operator. Furthermore, the printing position can be optimally adjusted by accurately scanning the printing position adjustment pattern. For this purpose, an optical sensor is located in the vicinity of the printing head, and the optical sensor is situated near a predetermined position side. The predetermined position side is a pinch roller side where a large restrictive force acts to the printing medium with the printing position adjustment pattern printed thereon.
摘要:
A print method that uses a printer apparatus based on a multi-pass printing method to reduce the unevenness of colors associated with a scanning direction, even during bidirectional color printing. For this purpose, sets of two print heads that apply cyan (C), magenta (M), and yellow (Y) inks are arranged to be symmetrical in the scanning direction so that a plurality of secondary color pixels arranged in a raster direction can be formed by changing an ink application order (C→M and M→C). Consequently, the pluralities of secondary color pixels arranged in the raster direction undergo the different ink application orders, so that the application order remains the same whether the pixels are formed during forward or backward scanning. Therefore, the unevenness of colors associated with the ink application order can be reduced.
摘要:
A complete image is obtained by performing printing scan for M times (M is an integral number: M ≧1) using N printing elements (N is an integral number: N≧2) on the same printing area of in a front side of the printing medium in the direction of transporting the printing medium. On the other hand, a complete image is also obtained by performing printing scan for K times (K is an integral number: K>M) using L printing elements (L is an integral number: L≦N) on the same printing area in rear side of the printing medium in the direction of transporting the printing medium.
摘要:
In a recording apparatus for effecting recording with a recording head on a recording medium, a temperature detector provided on a control circuit board of the recording apparatus detects a temperature at the board, and a timer measures a first activation time of electric power supply to the control circuit board for a control not involving a recording operation. The timing of reading the temperature detected by the temperature detector, as well as a correction value for the thus read value, are determined according to the first activation time measured by the timer.
摘要:
When recording a color image on a recording medium according to record data using black ink and color ink of a plurality of colors having a different characteristic of permeation into the recording medium from the black ink, detecting the boundary between a black image and a color image is executed. For an area where the boundary has not been detected, normal printing which can record the image at a relatively high speed is set. For an area where the boundary has been detected, multi-pass printing which can record the image at a relatively low speed is set. Thus, a drop of recording speed and bleeding at the boundary are prevented.
摘要:
When it is determined that a temperature of a recording head exceeds a predetermined temperature, a head exchange inhibit mode shift flag is set. Thus, even if an input to command the exchange of the recording head which is at a high temperature is made, the exchange operation is inhibited or the exchange is disabled.
摘要:
A column band pattern memory (10) stores six different column band patterns "SML, SLM, MSL, MLS, LSM, and LMS" obtained by re-arranging three different area modulation ranks (L, M, and S). A column band pattern generator (12) irregularly selects one of the column band patterns stored in the column band pattern memory (10) on the basis of a numerical value generated by a random number generator (11). The selected column band pattern is input to a dot area determination unit (13), and dot areas in units of columns are determined on the basis of the order of dot area modulation ranks (e.g., the order of S, M, and L) in the selected column band pattern. A pulse controller (14) performs pulse control to form dots in accordance with the dot areas determined by the dot area determination unit (13).
摘要:
An ink jet recording apparatus executes recording with a recording head, provided in a main body, for ejecting ink. The apparatus includes a head temperature detection member provided for the recording head, a reference temperature detection member provided for the main body, and a timer means for counting time. The apparatus further includes a correction amount determination section for determining a correction amount of a head temperature detected by the head temperature detection member based on a detected value of the head temperature detection member and a detected value of the reference temperature detection member at a predetermined time counted by the timer means. A calibration section is provided for calibrating a head temperature detected by the head temperature detection member based on the correction amount.
摘要:
An ink jet recording apparatus includes a recording head for ejecting ink from ejection unit to cause a change in temperature in a recording period, a temperature keeping unit for maintaining a temperature of the recording head at a predetermined keeping temperature higher than an upper limit of a surrounding temperature range in which recording is possible, a temperature prediction unit for predicting an ink temperature in the ejection unit in the recording period prior to recording, and an ejection stabilization unit for stabilizing ink ejection from the ejection unit according to the ink temperature in the ejection unit predicted by the temperature prediction unit.