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    Techniques for robust dot placement error measurement and correction
    7.
    发明授权
    Techniques for robust dot placement error measurement and correction 失效
    强大的点位置误差测量和校正技术

    公开(公告)号：US06331038B1

    公开(公告)日：2001-12-18

    申请号：US09492553

    申请日：2000-01-27

    申请人： Miquel Boleda ,  Jose J Doval ,  Albert Serra ,  Xavier Gros

    发明人： Miquel Boleda ,  Jose J Doval ,  Albert Serra ,  Xavier Gros

    IPC分类号： B41J2938

    CPC分类号： B41J2/2135 ,  B41J29/393

    摘要： Techniques to compensate for random and systematic errors when measuring dot placement errors. Error accumulation due to scan axis irregularities during printhead calibration is minimized by swapping alignment block positions on the print medium from swath to swath. Print media advances during the calibration are minimized by the use of a moving reference instead of a constant reference; adjacent groups of nozzles are used to calibrate the following group. Only a small media advance is needed to print alignment blocks using adjacent nozzle groups one beside the other to be calibrated. To prevent paper slip accumulative errors when using moving references, the order of the groups of nozzles is swapped from one paper advance to the other. This randomizes for small, unavoidable slips when advancing the paper and prevents error accumulation. No further paper advances are used at all for the rest of the dot placement calibration (odd to even columns in a print-head, pen to pen correction and bidirectional correction). When calibrating X-axis position for a group of nozzles, a group of nozzles located at the same Y-axis coordinate is used, so that no paper advances are needed to print them one beside the other.

    摘要翻译： 测量点位置误差时补偿随机和系统误差的技术。 在打印头校准期间由于扫描轴不规则造成的误差累积通过将打印介质上的对准块位置从条纹交换到条带来最小化。 通过使用移动参考而不是恒定参考来最小化校准期间的打印介质进给; 相邻的喷嘴组用于校准以下组。 只需要一个小介质提前打印校准块，使用相邻的喷嘴组，一个在另一个旁边进行校准。 为了防止在使用移动参考时出现纸张滑移累积误差，喷嘴组的顺序从一个纸张提前交换到另一个。 当纸张推进时，会随机分配小的不可避免的单据并防止错误累积。 对于剩余的点位置校准（打印头中的奇数到偶数列，笔到笔校正和双向校正），根本不使用进一步的纸张。 当校准一组喷嘴的X轴位置时，使用位于相同Y轴坐标处的一组喷嘴，因此不需要纸张前进来打印它们。

    Controlling residual fine errors of dot placement in an incremental printer
    8.
    发明授权
    Controlling residual fine errors of dot placement in an incremental printer 失效
    控制增量打印机中点放置的残留细微误差

    公开(公告)号：US06290319B1

    公开(公告)日：2001-09-18

    申请号：US09253494

    申请日：1999-02-19

    申请人： Miquel Boleda ,  Guillaume Montaclair ,  Francisco-Javier Pozuelo

    发明人： Miquel Boleda ,  Guillaume Montaclair ,  Francisco-Javier Pozuelo

    IPC分类号： B41J29393

    CPC分类号： B41J25/308 ,  B41J2/2132 ,  B41J19/20

    摘要： A memory holds calibration data that are applied to compensate imperfections in a printhead-carriage guide rod, improving alignment between marks printed with different heads. Commonly heads and a carriage encoder are spaced from the rod at different distances, which interact with rod deviation to form dot-placement errors (DPE) that vary along the rod. The memory holds a single offset value, best a weighted composite of (a) an average of maximum and minimum deviations from straightness, and (b) median deviation, along the rod; or as the carriage moves on the rod the system steps or interpolates between successive offsets, or uses a continuous corrective-offset function. Separate offsets may be stored for adjacent-head pairs. The memory is best a digital unit holding just a few data bits, but may be a mechanical cam or linkage, compensation network or other analog circuit, polynomial coefficients, or codestrip with unequally spaced graduations. A custom strip is used with no further intervention. Calibration data in other memory types are used to modify interhead alignment, carriage-encoder signals, carriage position/speed, printhead-actuation timing or marking rapidity—or image-data position values, color-plane alignment, or pixel structure. Calibration may be prepared by measuring rod-straightness deviations, calculating expectable DPEs between mark pairs made by different heads, and from these finding the needed numbers for storage. Measuring may use conventional instruments but preferably the printer prints patterns (e.g. alternating marks made by two outboard heads) and measures them with an internal sensor. In existing systems—with interhead alignment set in a limited rod segment—the offset is found by comparing DPE ranges over the whole length vs. that segment.

    摘要翻译： 存储器保存用于补偿打印头托架导杆中的缺陷的校准数据，改善用不同头部印刷的标记之间的对准。 通常头部和托架编码器与棒在不同距离处间隔开，这与棒偏差相互作用以形成沿杆变化的点位置误差（DPE）。 存储器保持单个偏移值，最好是（a）平直度的最大和最小偏差的平均值和（b）沿着杆的中间偏差的加权复合值; 或者当滑架在杆上移动时，系统在连续的偏移之间进行步进或内插，或者使用连续的校正偏移功能。 可以为相邻头对存储单独的偏移量。 存储器最好是仅保存几个数据位的数字单元，但可以是机械凸轮或联动，补偿网络或其他模拟电路，多项式系数或具有不相等间隔刻度的码流。 使用定制条，无需进一步干预。 其他存储器类型的校准数据用于修改刀头间对准，托架编码器信号，托架位置/速度，打印头致动定时或标记快速度或图像数据位置值，颜色平面对准或像素结构。 可以通过测量棒直度偏差来准备校准，计算由不同头部制成的标记对之间的预期DPE，并从中找出所需的存储数量。 测量可以使用传统的仪器，但优选地，打印机打印图案（例如由两个外侧头部制成的交替标记）并且用内部传感器测量它们。 在现有系统中 - 在有限的杆段中设置了头间对准 - 通过将整个长度上的DPE范围与该段进行比较来找到偏移量。

    Closed-loop color correction using factory-measured color cutoffs anchored to field-measured white point
    9.
    发明授权
    Closed-loop color correction using factory-measured color cutoffs anchored to field-measured white point 有权
    使用工厂测量的色彩截止值固定到场测量的白点的闭环色彩校正

    公开(公告)号：US07134737B2

    公开(公告)日：2006-11-14

    申请号：US09945492

    申请日：2001-08-31

    申请人： Ferran Vilanova ,  Miquel Boleda ,  James L. McCullough

    发明人： Ferran Vilanova ,  Miquel Boleda ,  James L. McCullough

    IPC分类号： B41J29/393

    CPC分类号： H04N1/4078 ,  B41J2/2132 ,  B41J2/525 ,  H04N1/6033

    摘要： Absolute perceptual values are stored in the design lab, for maximum-density-tone cutoffs—preferably a maximum yellow-blue chrominance b* for yellow and minimum luminosity L* for other colorants. Automatic field operations in each printer then force the printer to subsequently print nominal full-saturation colorants so as to match the stored values. In addition to the stored cut-offs, black-and-white reference values measured in the printer are also used in linearizing printer response, for specific combinations of printing medium and printmode.

    摘要翻译： 绝对感知值存储在设计实验室中，用于最大密度色调截止值 - 优选最大黄 - 蓝色度b *，用于其他着色剂的黄色和最小亮度L *。 每个打印机中的自动现场操作然后强制打印机随后打印标称全饱和着色剂，以便与存储的值相匹配。 除了存储的切口之外，打印机中测量的黑白参考值也用于线性化打印机响应，用于打印介质和打印模式的特定组合。