Printer consumable product having data storage for static and dynamic calibration data, and methods
A dynamic calibration, memory technology, applied in the field of utilizing the information stored in it, which can solve the problems of measurement errors, inaccuracy, unreliability, etc.
Active Publication Date: 2006-03-08
HEWLETT PACKARD CO
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AI Technical Summary
Problems solved by technology
For example, different inks can have significantly different impedance characteristics, causing impedance-based ink level detectors or low-ink sensors to provide inaccurate indications
[0005] Second, variation between printers and within a printer over time can affect accuracy
Normal component tolerances and variations over lifetime in sensors and measurement circuits can cause printer-to-printer variation, and changes in environmental variables, such as temperature, can cause measurement errors
[0006] The problem of inaccurate or unreliable sensor readings is even more acute in situations where a printer controller must distinguish between more than two discrete levels, such as when an inkjet printer controller must determine whether a portion of the ink delivery system contains ink, air, or "foam." "(mixture of ink and air)
Method used
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[0019] Embodiments of the invention will be described in detail with respect to an example inkjet printer system; however, the invention is not limited to the type of printer illustrated, but may be used in any type of printer system having user-replaceable consumables.
[0020] figure 1 is a block diagram of an example printer system illustrating how the printer controller can receive signals from sensors located on or near the ink jet sources, the ink delivery system, and the printhead. The inkjet source 110a may have one or more associated sensors 112 within the inkjet supply, mounted on the inkjet supply, or placed in the printer adjacent to the inkjet supply. The sensor may sense the ink level in the jet, for example by impedance measurement, or optically. The inkjet source has an associated memory device 116, described below. Typically, the memory device is of the type that retains information in the absence of power, such as Electronically Erasable Programmable Read O...
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Embodiments of the present invention include methods and apparatus for compensating for variations between different ink or toner characteristics, and for variations between sensors, by characterizing the ink or toner and storing one or more static threshold level on printer consumable memory devices during manufacture of the printer consumables. When installed in a printer, a dynamic threshold may be determined based on the static threshold level; the dynamic threshold accounting for variations between sensors and printers. The dynamic threshold may further be stored on the printer consumable memory device.
Description
technical field [0001] The present invention relates generally to printer consumables, and more particularly to memory components on printer consumables, and methods of utilizing information stored therein. technical background [0002] Printers (and related equipment such as fax machines and copiers) having user-replaceable consumables are well known in the art. For example, inkjet printers typically utilize replaceable ink jet supplies, either integrated with the printhead or in the form of separate jets. Typically, when separate ink jet sources are used in an inkjet printer system, the printhead is also separately replaceable and can also be considered a "consumable". Typically, in laser printers, toner is supplied in a replaceable toner cartridge, which may include a photosensitive drum on which an image is formed. [0003] Typically, printer systems include sensors to monitor conditions in the printer. For example, in inkjet printers, sensors are used to detect ink c...
Claims
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IPC IPC(8): B41J2/175
CPCB41J2/17546B41J29/393B41J2/175
Inventor I·法尔S·施夫吉
Owner HEWLETT PACKARD CO