Patent Document

The present application is a continuation of allowed U.S. application Ser. No. 10/928,058 filed on Aug. 27, 2004. 

   BACKGROUND 
   The present invention generally relates to manufacturing and repairing replaceable imaging components, and more particularly to techniques for providing a cartridge chip comprising a memory element adapted for selectably operating in different types of imaging cartridges. 
   In the imaging industry, there is a growing market for the remanufacture and refurbishing of various types of replaceable imaging components such as toner cartridges, drum cartridges, ink cartridges, and the like. Imaging cartridges, such as toner cartridges, once spent, are unusable for their originally intended purpose. Without a refurbishing process, they would simply be discarded, even though the cartridge itself may still have potential life. As a result, techniques have been developed specifically to address this issue. These processes may entail, for example, the disassembly of the various structures of the cartridge, replacing toner or ink, cleaning, adjusting or replacing any worn components and reassembling the cartridge. 
   Some imaging cartridges may include a cartridge chip having a memory device which is used to store data related to the cartridge or the imaging device. An imaging device may include laser printers, copiers, inkjet printers, facsimile machines and the like, for example. The imaging device, such as the printer, reads this data stored in the memory device to determine certain printing parameters and communicate information to the user. For example, the memory may store the model number of the cartridge so that the printer may recognize the cartridge as one which is compatible with that particular printer. Additionally, by way of example, the cartridge memory may store the number of pages that can be expected to be printed from the imaging cartridge during a life cycle of the cartridge and other useful data. The imaging device may also write certain data to the memory device, such as the amount of toner remaining in the cartridge. Other data stored in the cartridge may relate to the usage history of the imaging cartridge. 
   For a given imaging device such as a printer, the appropriate cartridges may be available in a variety of styles. Lexmark, for example, may sell a “Use and Return” cartridge and a “Non Use and Return” cartridge for a given printer model. Both of these types of cartridges interface with the printer in different ways and may include differing physical characteristics, such as different encoder wheels. Different functionality may need to be provided the cartridge chip for each of these types of cartridges. Previously, a single cartridge chip having a switch was utilized for both types of cartridges. Based on the setting of the switch, the cartridge chip would be compatible with one of the cartridge types. However, these switches increase both the cost and size of the cartridge chip. Thus, it would be advantageous to provide systems and methods for selecting a mode of operation for a cartridge chip which is user friendly, cost effective and minimizes the space consumed on the cartridge chip. 
   SUMMARY 
   In one aspect of the present invention a method of configuring an imaging cartridge includes determining if the imaging cartridge is a first type of imaging cartridge or a second type of imaging cartridge; providing a cartridge chip comprising a controller and a resistive element connected between the controller and a reference potential, with the cartridge chip adapted for operation in a first mode of operation compatible with the first type of imaging cartridge when the controller detects the reference potential through the resistive element and adapted for operation in a second mode of operation compatible with the second type of imaging cartridge when the controller cannot detect the reference potential through the resistive element; removing the resistive element from the cartridge chip if the imaging cartridge is the second type of imaging cartridge; and attaching the cartridge chip to the imaging cartridge. 
   In another aspect of the present invention, a cartridge chip for use with a first type of imaging cartridge and a second type of imaging cartridge comprises a controller and resistive element connected between the controller and a reference potential, the cartridge chip adapted for operation in a first mode of operation compatible with the first type of imaging cartridge when the controller detects the reference potential through the resistive element, the cartridge chip adapted for operation in a second mode of operation compatible with the second type of imaging cartridge when the controller cannot detect the reference potential through the resistive element. 
   A more complete understanding of the present invention, as well as further features and advantages of the invention, will be apparent from the following detailed description and the accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a functional block diagram of a cartridge chip in accordance with the present invention; and 
       FIG. 2  shows a perspective view of a cartridge chip in accordance with the present invention. 
   

   DETAILED DESCRIPTION 
   The following detailed description of preferred embodiments refers to the accompanying drawings which illustrate specific embodiments of the invention. In the discussion that follows, specific systems and techniques for repairing, manufacturing or remanufacturing a toner cartridge including a memory element are disclosed. Other embodiments having different structures and operations for the repair, remanufacture and operation of other types of replaceable imaging components and for various types of imaging devices, such as laser printers, inkjet printers, copiers, facsimile machines and the like do not depart from the scope of the present invention. 
     FIG. 1  shows a functional block diagram of a cartridge chip  100  in accordance with the present invention. The cartridge chip  100  may suitable include input/output (I/O) interface circuitry  102 , a controller  104 , and a memory  106 . The cartridge chip  100  also includes a resistor  108  connected between an input port  109  of the controller  104  and electrical ground. Alternately, the resistor  108  may be connected between the input port  109  of the controller  104  and a positive or negative voltage reference potential. In one aspect, the resistor  108  may be a surface mount type of resistor. The I/O interface circuitry  102  is communicatively connected to the controller  104  and provides the appropriate electronic circuitry for the controller  104  to communicate with an imaging device, such as a printer. As an example, for imaging devices which communicate utilizing radio frequency (RF), the I/O interface circuitry  102  may include a radio frequency (RF) antenna and associated circuitry, and for a direct wired connection to imaging devices the I/O interface circuitry  102  may include one or more contact pads, or the like. The controller  104  controls the operation of the cartridge chip  100  and provides a functional interface to the memory  106 . 
   The controller  104  controls the reading of data from and the writing of data to the memory  106 . The data read from or written to the cartridge chip  100  may include a printer type, cartridge serial number, the number of revolutions performed by the organic photo conductor (OPC) drum (drum count), the manufacturing date, number of pages printed (page count), percentage of toner remaining, yield (expected number of pages), color indicator, toner-out indicator, toner low indicator, virgin cartridge indicator (whether or not the cartridge has been remanufactured before), job count (number of pages printed and page type), and any other data that may be stored on the cartridge memory element. 
   The controller  104  may be suitable implemented as a custom or semi-custom integrated circuit, a programmable gate array, a microprocessor executing instructions from the memory  106  or other memory, a microcontroller, or the like. Additionally, the controller  104 , the memory  106  and/or the I/O interface circuitry  102  may be separated or combined in one or more physical modules. These modules and the resistor  108  may be suitably mounted to a printed circuit board to form the cartridge chip  100 .  FIG. 2  shows a perspective view of the cartridge chip  100  in accordance with the present invention. 
   In a preferred embodiment of the present invention, the cartridge chip  100  may advantageously operate with either of two types of cartridges for a given printer or imaging device by operating in either of two modes of operation. For example, a first mode of operation may be compatible with a “Prebate” cartridge sold by Lexmark for a particular printer and a second mode of operation may be compatible with a “Non-Prebate” cartridge sold by Lexmark for that same printer. Continuing this example, when operating in the first mode of operation the controller  104  will return one value to the printer when the printer attempts to read a predetermined memory location in the memory  106 , and when operating in the second mode of operation the controller  104  will return a different value to the printer when the printer attempts to read the same predetermined memory location. These differing values in the predetermined memory location may be based on the differences between the encoder wheels of the different cartridge types. The value returned by the controller  104  operating in the first mode of operation is compatible with encoder wheel of a first cartridge type and the value returned by the controller  104  operating in the second mode of operation is compatible with the encoder wheel of a second cartridge type. The printer may compare the read value to the type of encoder wheel sensed by the printer to ensure that the correct encoder wheel is being used with the correct cartridge chip. Stated another way, the cartridge chip  100  may imitate a “Prebate” cartridge chip when installed on a “Prebate” cartridge and a “Non-Prebate” chip when installed on a “Non-Prebate” cartridge. 
   To facilitate such functionality, the controller  104  determines the appropriate mode of operation based on the presence of absence of the resistor  108 . Each cartridge chip  100  may be manufactured with the resistor  108  in place on the cartridge chip  100  and then optionally removed prior to installation on the imaging cartridge based on the type of the imaging cartridge. The controller  104  may suitably read the input port  109  to determine the presence of absence of the resistor  108 . Preferably, the input port  109  includes internal pull-up circuitry which prevents the input port  109  from floating by pulling the input voltage to a predetermined value when the resistor  108  is not present. If the controller  104  reads a logic 0 (due to the ground connection through the resistor  108 ) on the port  109 , then the controller  104  will operate in one mode compatible with a first type of imaging cartridge, and if the controller  104  reads a logic 1 (due to the internal pull-up circuitry), then the controller  104  will operate in another mode compatible with a second type of imaging cartridge. The resistor  108  is preferably 1 kohms to 5 kohms. The resistor  108  is preferably a surface mount resistor which may be removed from the cartridge chip by a user prior to installing the cartridge chip  100  on the appropriate type of cartridge. The resistor  108  may be removed by pliers or other mechanical means. 
   Optionally, if internal pull-up circuitry is not present on the input port  109 , an external resistor may be deployed for the same purpose. 
   In an alternate embodiment, the resistor  108  may be connected between the input port  209  and a positive or negative reference voltage potential. 
   In another aspect of the present invention, additional resistors may be suitably connected to additio 0 nal input ports of the controller  104  to provide for further modes of operation. For example, for two resistors connected to two input ports, the controller  104  may determine up to four modes of operation, if desired. 
   In an alternate embodiment of the present invention, the resistor  108  may remain in place on the cartridge chip  100  and a portion of a conductive element connecting the resistor  108  to the input port  109  or to the reference potential may be removed or cut. 
   In another aspect of the present invention, the input port  109  may be connected to the reference potential utilizing conductive ink. A portion of the conductive ink connecting the input port  109  to the reference potential may be removed or cut. 
   Although specific embodiments have been illustrated and described herein, those of ordinary skill in the art appreciate that any arrangement which is calculated to achieve the same purpose may be substituted for the specific embodiments shown and that the invention has other applications in other environments. This application is intended to cover any adaptations or variations of the present invention. The following claims are in no way intended to limit the scope of the invention to the specific embodiments described herein.

Technology Category: 3