Patent Application
20080065676
Embodiments of the invention are better understood with reference to the following drawings. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.
The device RFID tag 60 includes an electronic chip (See
In one embodiment, the reader system 54 includes an antenna pad 62 having a pad antenna 62a (or antenna 62a) operably coupled to a reader unit 64 via a cable 65 and electrically coupled to a graphical user interface (GUI) 66. In one embodiment, the antenna pad 62 includes an impedance matching network (not shown, but internal to the pad 62) between the antenna 62a and the cable 65. In general, the pad antenna 62a is configured to generate an electromagnetic field that inductively powers the device RFID tag 60. The pad antenna 62a is sized/selected based upon balancing certain radiation limits that government entities place on such antennas with a desired/specified range for the pad antenna 62a in activating the device RFID tag 60, and with a convenient pad size. For example, the Federal Communications Commission (FCC) specifies a field limit for antenna output at 10 meters and 30 meters, and the pad antenna 62a is sized as described below to provide a read range for at least one data storage device 52, and preferably for multiple data storage devices 52, that complies with the FCC field limits. With this in mind, one embodiment of the pad antenna 62a provides a rectangular antenna 62a having an effective antenna area of about 370 mm by about 450 mm to provide a sufficient read field out to a furthermost edge of multiple data storage devices 52 that are placed adjacent to the pad antenna 62, as more fully described in
The reader unit 64 includes an enclosure 68 housing a transceiver, signal processor, controller, memory, power supply, and reader PC board (not shown) that are operable to read data from the device RFID tag 60 and transmit the data to the GUI 66. In this regard, in one embodiment the reader unit 64 is generally a transceiver and includes reader software having a library of calls and a source code that enables the contactless identification of objects. One example of suitable reader software includes software provided with a Feig Electronics RFID reader unit available from Feig Electronics, Weilburg, Germany. These and other suitable reader units are compatible and comply with ISO, EN, DIN standards. In general, the reader unit 64 is powered by an electrical connection 70, such as a 120 volt power cord, and includes an output connection 72, such as an Ethernet connection or a universal serial bus (USB) that couples to the GUI 66. Other power sources and output connectors are also acceptable.
The cable 65 is selected to have a length that desirably separates the reader unit 64 from the pad antenna 62a to minimize possible interference between the reader unit 64 and the antenna 62a. In an alternative embodiment, the reader unit 64 is integrated with the pad antenna 62a and the cable 65 is optional.
In one embodiment, the GUI 66 includes a memory unit 74 and a display unit 76. The data collected from the data storage device 52 by the reader unit 64 can be transmitted to the GUI 66 for data storage, data manipulation, and data appending in a variety of manners. For example, in one embodiment the GUI 66 records and sorts data collected from multiple such data storage devices 52 passing by the reader system 54. In another embodiment, the GUI 66 is operable to append data to the device RFID tag 60, including a volser number that might either be missing from the data storage device 52 or not yet initialized to the data storage device 52. In other embodiments, the GUI 66 is operable to append and record shipping information related to the transfer of the data storage device 52 as it leaves a user facility in transit to a storage facility, or as the data storage device 52 returns from a storage facility to the user facility.
In general, the GUI 66 operates on GUI software that is adapted to access the library of calls and the source code of the software of the reader unit 64 described above. In particular, in one embodiment the GUI software employs a code that communicates with the software of the reader unit 64 and enables a user of the GUI 66 to generate encrypted tag ID numbers and/or cyclic redundancy check values that are stored in the device RFID tag 60, as described in
For example, software of the reader unit 64 is employed to read information from the device RFID tag 60, and software of the GUI 66 accesses the information read by the software of the reader unit 64 and writes a file in extensible markup language (XML). The XML file is executed in a form that enables a user to customize the definition, transmission, validation, and/or interpretation of data within fields of the device RFID tag 60. The XML file is configured for sharing with a database via software operable by the GUI 66. In this manner, a user of the system 50 experiences seamless file sharing between the database software and the software of the GUI 66, which is useful in the tracing of the data storage device 52 via the device RFID tag 60. In one embodiment, the database software is a tape management software useful in collating information related to the shipment of data storage devices, for example, and the software of the GUI 66 is dynamically linked via an operating system of the GUI 66 to communicate with the tape management software, such that little or no user intervention is necessitated in the tracing of devices 52 via the system 50. In one embodiment, the XML file generated by the software of the GUI 66 is encrypted such that the definition, transmission, validation, and/or interpretation of data between the software of the GUI 66 and the database are secure.
The storing, sorting, and appending of data by the GUI 66 can include the user manipulation of a stylus 78 that interacts with the display unit 76. In this regard, the GUI 66 enables a user to view the data storage devices 52 that are traced, and view and manipulate the corresponding volser numbers of the data storage devices 52 that are sorted and traced between facilities. For example, in one embodiment the user employs the stylus 78 to select, sort, and input a desired disposition (destination or receipt location) of one or more devices 52 into display unit 76, the selection of which is stored and/or operated on by the memory unit 74 as assisted by the GUI software and ultimately communicated to a lookup/tracing database, for example via transmission over the Internet.
Generally, the data storage device 52 includes the housing 56, a brake assembly 100, a tape reel assembly 102, and a storage tape 104. In one embodiment, the device RFID tag 60 is coupled to an interior surface 106 of the housing 56, and the optical label 58 is coupled to an exterior surface 108 of the housing 56. In this regard, although the optical label 58 is illustrated as coupled to a side of the housing 56, it is to be understood that the optical label 58 is coupleable to other portions of the exterior surface 108 of the housing 56, such as an end surface, for example. The tape reel assembly 102 is disposed within the housing 56. The storage tape 104, in turn, is wound about the tape reel assembly 102 and includes a leading end 110 attached to a leader block 112.
The housing 56 is sized for insertion into a typical tape drive (not shown). Thus, the housing 56 size is approximately 125 mm×110 mm×21 mm (having a volume of about 29 cm3), although other dimensions are equally acceptable. With this in mind, the housing 56 defines a first housing section 114 and a second housing section 116. In one embodiment, the first housing section 114 forms a cover, and the second housing section 116 forms a base. It is to be understood that directional terminology such as “cover,” “base,” “upper,” “lower,” “top,” “bottom,” etc., is employed throughout this specification to illustrate various examples, and is in no way intended to be limiting.
The first and second housing sections 114 and 116, respectively, are reciprocally mated to one another to form an enclosed region 118 and are generally rectangular, except for one corner 120 that is preferably angled to form a tape access window 122. The tape access window 122 forms an opening for the storage tape 104 to exit the housing 56 when the leader block 112 is removed from the tape access window 122 and threaded to a tape drive system (not shown) for read/write operations. Conversely, when the leader block 112 is stored in the tape access window 122, the tape access window 122 is covered.
In addition to forming a portion of the tape access window 122, the second housing section 116 also forms a central opening 124. The central opening 124 facilitates access to the tape reel assembly 102 by a drive chuck of the tape drive (neither shown). During use, the drive chuck enters the central opening 124 to disengage the brake assembly 100 prior to rotating the tape reel assembly 102 for access to the storage tape 104.
The brake assembly 100 is of a type known in the art and generally includes a brake body 126 and a spring 128 co-axially disposed within the tape reel assembly 102. When the data storage device 52 is idle, the brake assembly 100 is engaged with a brake interface 130 to selectively “lock” the tape reel assembly 102 to the housing 56.
The tape reel assembly 102 includes a hub 132, an upper flange 134, and a lower flange 136. The hub 132 defines a tape-winding surface (not visible in
The storage tape 104 is preferably a magnetic tape of a type commonly known in the art. For example, the storage tape 104 can be a balanced polyethylene naphthalate (PEN) based substrate or polyester substrate coated on one side with a layer of magnetic material dispersed within a suitable binder system, and coated on the other side with a conductive material dispersed within a suitable binder system. Acceptable magnetic tape is available, for example, from Imation Corp., of Oakdale, Minn.
The leader block 112 covers the tape access window 122 during storage of the data storage device 52 and facilitates retrieval of the storage tape 104 for read/write operations. In general terms, the leader block 112 is shaped to conform to the window 122 of the housing 56 and to cooperate with the tape drive (not shown) by providing a grasping surface for the tape drive to manipulate in delivering the storage tape 104 to the read/write head. In this regard, the leader block 112 can be replaced by other components, such as a dumb-bell shaped pin. Moreover, the leader block 112, or a similar component, can be eliminated entirely, as is the case with dual reel cartridge designs.
In one embodiment, a first pocket (not shown) is formed in the first housing section 114 and a second reciprocal and opposing pocket (not shown) is formed in the second housing section 116 such that upon assembly of the housing 56, the opposing pockets combine to form a cavity within the enclosed region 118 that is configured to retain the device RFID tag 60. In this regard, the device RFID tag 60 is coupled to the housing 56 by being retained within the cavity. In another embodiment, the device RFID tag 60 is adhesively attached directly to the interior surface 106 of the first housing section 114.
In one embodiment the device RFID tag 60 is a passive RFID tag and includes a backing 140, a silicon chip 142, and an antenna 144. The backing 140 is a substrate configured to retain the silicon chip 142 and the antenna 144. In this regard, the backing 140 is a carrier for the chip 142 and the antenna 144 components and in one embodiment is rigid and is referred to as a printed circuit board backing. For example, in one embodiment the backing 140 is a polyester backing to which two or more layers of a metal foil are adhered. The metal foils are etched to form a coiled antenna 144, a capacitor, and integrated circuit (IC) pads. Suitable connections are made between the foil layers, and an integrated circuit such as the chip 142 is attached and electrically connected to the IC pads employing, for example, an anisotropic conductive adhesive.
In an alternate embodiment, the backing 140 is a flexible film backing onto which the chip 142 and the antenna 144 components are laminated to one side prior to adhesively attaching an opposing side of the backing 140 to the interior surface 106 of housing 56. In addition, the backing 140 can include electrical features (such as pads, metal-plating holes, wire bonding, etc.) adapted to facilitate information transfer to/from the chip 142. In any regard, it is generally desirable to locate the antenna 144 relative to the housing 56 (
As a point of reference, when the device RFID tag 60 is a passive RFID tag, it does not employ its own power source. In this regard, the passive RFID tag is “powered” whenever access to the tag is initiated by the reader system 54 (
In one embodiment, the device RFID tag 60 includes an optical label 148 coupled to the backing 140 opposite of the circuitry 146. The label 146 provides a continuous lateral area that is suited for printing a media identification field 143 alongside of a volser identification field 145. In this regard, in one embodiment the label 148 is a newly manufactured label that is printed with the media identification field 143 and the volser identification field 145 and is attached over the circuitry 146 of a new device RFID tag 60 during the manufacture of a new data storage device 52. In another embodiment, the label 148 is optional and the media identification field and the volser identification field are provided as a portion of a retrofitted optical label 58 (
The RFID tag 60 includes the backing 140 or other substrate onto which is disposed circuitry 146 including the capacitor 141′, the silicon chip 142 and the antenna 144. In this regard, the circuitry 146, which includes the chip 142 and the antenna 144, is referred to as an inlay (or inlet) 146. In one embodiment, the backing 140 is a laminate having adhesive coated onto each of the opposing two sides. One adhesively coated side is configured for attachment to the housing 56 (
The silicon chip 142 electronically records and/or stores device information and is not necessarily drawn to scale in FIGS. 2 and 3A-3C. In one embodiment, the silicon chip 142 is configured to store device information into a plurality of data fields. For example, in one embodiment, the silicon chip 142 is a memory chip capable of recording and/or storing device information, such as a format of data stored on the device 52 and a volser number associated with the device 52. In one embodiment, the memory of the silicon chip 142 stores a subset of data that is present on the optical label 58. In an alternative embodiment, the memory of the silicon chip 142 stores all data that is present on the optical label 58 and includes fields including a 64 bit unique TAG identifier, an 8 bit RFID revision level, an 88 bit user defined volser number, a 32 bit cyclic redundancy check (CRC) sum, a 160 bit manufacturer's serial number, a case and/or device identifying number, and other data fields. In another embodiment, the silicon chip 142 stores different field information for different forms of devices 52. To this end, the silicon chip 142 is preferably an electronic memory chip having at least the memory capacity to be written with device information. In one embodiment, the silicon chip 142 is an electronic memory chip capable of retaining stored data even in a power “off” condition, and is for example, a 4 k-byte electrically erasable programmable read-only memory (EEPROM) chip known as an EEPROM chip available from, for example, Philips Semiconductors, Eindhoven, The Netherlands. In another embodiment, the silicon chip 142 is a 1 k-byte EEPROM chip. Those with skill in the art of memory chips will recognize that other memory formats and sizes for the chip 142 are also acceptable.
The chip 142 is programmed to have a specific content and format for the information stored in memory. In one embodiment, the chip 142 electronically stores a subset of the data present on the optical label 58 (
In one embodiment, the volser number is a unique number that is specific to each data storage device it is associated with. In another embodiment, the volser number is a non-unique number. The volser number can be user-defined or assigned by a manufacturer according to specifications provided by a customer. In general, the volser number includes a character within the 88 bit field to mark the end of the volser number, which enables the reading and interpretation of variable length and/or unique volser numbers. In one embodiment, the end mark character is a NULL character, for example 8 bits of all binary zeros. As a point of reference, 8 bits of all binary zeros is the initial state of the memory, and also corresponds with a string termination character in the program language C/C++. In one embodiment, the bit pattern of the volser number is not encrypted when reading or writing the volser number to enable easy decoding by an outside source, such as a customer or client. In other embodiments, the volser number is encrypted (for example by inverting the bits) to prevent decoding by an outside source, or encoded to save space in the memory of the chip 142.
The CRC is a 32 bit field derived from the tag ID, the RFID revision, and the volser number. In one embodiment, the CRC is form of a hash function that is employed to produce a check value against a block of data, such as a packet of network traffic or a block of a computer file. In this regard, a check value is a small, fixed number of bits that can be employed to detect errors after transmission or storage of data. For example, in one embodiment the CRC is computed and appended before transmission or storage, and verified afterwards by a recipient to confirm that no changes occurred on transmission of the data. Advantages of CRCs are that they are easily implemented in binary hardware, they can be analyzed mathematically, and CRCs detect common errors caused by noise in transmission channels.
The CRC value is the remainder of a binary division that has no bit carry in the message bit stream, by a pre-defined and preferably short bit stream having a length n, where n represents a coefficient of a polynomial. Generally, CRCs are derived from the division of a polynomial, such as a ring of polynomial, over a finite field. In this regard, the set of polynomials is chosen such that each coefficient is either 0 or 1 (which is a fundamental of a binary or base 2 number). In an exemplary embodiment, the generating polynomial of the CRC is chosen to be:
x̂=+x̂26+x̂23+x̂22+x̂16+x̂12+x̂11+x̂10+x̂+x̂7+x̂5+x̂+x̂2+x̂+x̂0
and a seed value is selected to be 0xFFFFFFFF. In this manner, the CRC enables the determination if one or more of the tag ID, the RFID revision, or the volser number have become corrupted or incorrectly read during transmission.
In other embodiments, a checksum, parity check, or other function may be employed to generate the check value for the data. A checksum usually refers to a check value that is a sum of the data being checked. A parity check usually refers to a check value that is the exclusive-or of the data being checked. The set of functions useful in generating such check values are referred to as hash functions.
In one embodiment, the antenna 144 is a coiled copper radio frequency (RF) antenna. In an alternate embodiment, the antenna 144 is integrated within the chip 142. In any regard, it is to be understood that other materials for, and various forms of, the antenna 144 are also acceptable. In general, the antenna 144 is configured to inductively couple with the reader system 54 (
In one embodiment, the device RFID tag 60 is employed in a 13.56 MHz RFID system and the antenna 144 has a reactance that produces a resonance of about 13.56 MHz. In this regard, for RFID circuits having a capacitance of 27 pF, the antenna coil and parallel capacitor have a reactance of about +j435 ohms, equivalent to an inductance of about 5.1 μH. Other IC capacitances require different antenna reactances to resonate at 13.56 MHz. To this end, other capacitances and antenna reactances for the device RFID tag 60 are also acceptable. In one embodiment, the antenna 144 has a capacitance that is adjustable to tune the resident frequency. In another embodiment, the capacitance of the antenna 144 is laser trimmed.
It is desired that the device RFID tag 60 be sized to fit within a perimeter of the optical label 58 (
For example, one aspect of the invention provides the data storage device 52 as a data storage tape cartridge and the antenna 144 within the circuitry 146 is selected to have a width W of about 15 mm and a length L of about 77 mm, resulting in an antenna area of about 1155 sq. mm. In this manner, the antenna 144 is provided with a sufficient range, while the device RFID tag 60 is sized to fit beneath the optical label 58 (
With additional reference to
Aspects of the present application can be broadly applied to any manner or style of data storage device, and is not limited to the data storage tape cartridge illustrated in
In one embodiment, the device RFID 160 includes a backing 170, a silicon chip 172, and an antenna 174. The backing 170 is highly similar to the backing 140 (
The backing 220 is highly similar to the backing 140 (
In one embodiment, the data storage device 200 is a 2.5 inch SATA hard disk drive and the housing 202 substantially replicates a tape cartridge. In this manner, the data storage device 200 conforms to industry standard tape cartridges, and is compatible with existing tape automation equipment and software. In one embodiment, the data storage device 200 is a sealed, anti-static hard disk drive cartridge having a form factor that is suited for library cases, racks, and like manner of cartridge carousels.
In some embodiments, multiple pad antennas 62 are disposed in a row in order to ensure that the fields generated by the antenna 62a is larger than a perimeter of the data storage device 52, or a carton of multiple data storage devices, that is placed on the pad antenna 62. In other embodiments, two antenna pads 62 are oriented orthogonally one to the other such that the field generated by the antennas 62a intersects in a perpendicular manner to ensure that any random orientation of the device RFID tag 60 is readable. Although not shown, scanners/multiplexers and power splitters may be used to connect multiple antennas to a reader.
In general, and with additional reference to
In one embodiment, the menu 302 includes a cartridge initialization tab 306 that is configured to identify and initialize a new cartridge entering the reader system 54. A user activating the tab 306 is prompted to enter an ID in field 308. In one embodiment, the ID entered in field 308 is a volser number generated by the user that is to be assigned to the data storage device 52, and in particular, to the device RFID tag 60 attached to the device 52. In other embodiments, a sorted table of label serial numbers and corresponding volser numbers associated with multiple data storage devices 52 is stored on a mass storage device within memory unit 74, and the reader system 54 is operable to enter a suitable corresponding volser number for a selected one of the devices 52 into the ID field 308. In a similar manner, a tag ID for a selected one of the devices 52 can be either scanned or entered into field 310. Once initialized, the data storage device 52 is usable to store data and is configured for tracing via the system 50.
In one embodiment, the case 404 defines an enclosure 406 provided with an insert 408, a global positioning system (GPS) unit 410 coupled to the enclosure 406 that enables tracking of the case 404 and the devices 402, and a case RFID tag 412 coupled to the enclosure 406. In one embodiment, the case 404 includes a first section 414 and a second section 416, where the first section 414 is a cover and the second section 416 is a base. The cover 414 includes the tracking GPS unit 410 and the case RFID tag 412 coupled to the cover 414. In this regard, the cover 414 is illustrated in an open position to provide a better view of the multiple data storage devices 402 in the base 416, although it is to be understood that tracing and tracking of the devices 402 is preferably accomplished by maintaining the cover 414 in the closed position.
In one embodiment, the case 404 is a molded case of a durable plastic resin and includes the cover 414 movably coupled to the base 416, and a carrying handle 417 coupled to the base 416. In general, the case 404 is sized to accommodate multiple data storage devices 402. In one embodiment, each data storage device 402 occupies a volume of about 29 cm3 and the case 404 is sized to contain about twenty such devices 402 within the enclosure 406. The case 404 can be molded from any suitable engineering plastic, such as polyester, polycarbonate, high density polyethylene, and the like. One suitable case 404 is molded from Lexan™ HPX polycarbonate resin, available from GE Advanced Materials, Fairfield, Conn. Suitable cases 404 are available from Hardigg, South Deerfield, Mass., and are identified as STORM CASE®.
The insert 408 is removably formed within the base 416 and is preferably a molded plastic insert configured to retain each of the multiple data storage devices 402 in a manner that orients the device RFID tags 60 perpendicular to the field generated by the pad antenna 62, which enables the reader system 54 to quickly and accurately read the multiple device RFID tags 60. In this regard, it is desired that the base insert 408 not interfere with the radiofrequency reading of the device RFID tags 60 attached to the devices 402. In one embodiment, the insert 404 includes multiple layers of cubed foam that can be customized to accommodate one or more data storage devices 402. In another embodiment, the insert 408 is a molded plastic insert, formed from suitable polymers such as polyolefins and the like, or other plastics. In this regard, the insert 408 can be either a rigid insert or a compliant insert.
The GPS unit 410 is a suitable global positioning system including cellular telephony technology that enables digital communication between the system 50 (
The case RFID tag 412 is similar to the device RFID tag 60 (
In one embodiment, the tracing and tracking system 400 includes an optional portable reader device 420 configured to read one or both of the optical tag 58 (
As a point of reference, in some circumstances the case 404 is a metallic case that interferes with the sending and receiving of radio frequency signals within the reader system 54. To this end, in one embodiment the case 404 includes the cover 414 that can be opened to expose the optical label 58 and the device RFID tag 60 on the multiple data storage devices 402 for direct reading by the portable reader 420. In a preferred embodiment, the case 404 is a plastic case that is configured to enable the reader system 54 to read the identity of the multiple data storage devices 402 within the case 404 without having to open the cover 414.
The PDA 420 includes a variety of personal digital assistants operable with Windows Mobile 5.0 software or higher. One suitable PDA includes Dell Axim X51v available from www.dell.com.
The application software operable by the PDA 420 is designed to work in the environment described above in reading and writing to the device RFID tags 60. The PDA 420 includes a status line 428 that is visible throughout the session when accessing the dialog tabs. A variety of dialog tabs are provided including an inventory tab 430, a locate tab 432, a tools tab 434, and a help tab 436.
The inventory tab 430 includes controls that are employed to support performing a device inventory and includes a listbox that stores the volser numbers of scanned devices and a series of command buttons. The series of command buttons includes a start/stop scan button that is employed to place the device RFID tag 60 into and out of a scanning mode. When scanning, volser numbers of located devices 402 are inserted into the listbox. If the device RFID tag 60 information is validated (for example via the CRC check described above), the volser number is prominently displayed. If the device RFID tag 60 information is not validated, a flag is displayed, such as the volser number being displayed in red text. A text message can be displayed beneath the listbox for documenting a count of how many devices have been scanned.
The detail command button is employed to display a modal dialog containing detailed information related to the volser number currently selected in the listbox. For example, such information can include the unique tag identifier, the revision number, the volser number, and the CRC described above.
The save command button can be employed to save information on scanned devices. In one embodiment, the information is saved in encrypted format. Tapping the save command button will bring up a modal dialog box in which save options are presented prior to the actual creation of a saved file.
The clear list button will clear information from the listbox.
The locate tab 432 is employed to locate devices from an imported watch list. As with the inventory tab 430, accessing the locate tab 432 provides a listbox with volser numbers of the as-identified watch list items and a series of command buttons. The series of command buttons includes an import list button that is useful to bring up a file selection dialog, where the selected file contains a list of volser numbers in a predefined format. Volser numbers are read from the file, and inserted into the list box in text.
The seek/stop seek command button is employed to engage the scan card between an in-scan mode and an out of scan mode. While scanning, if a device in the watch list is detected, the volser number in the listbox is changed to a green color, for example, to indicate that the watched-for device 402 has been located. A text box beneath the listbox contains a count of matching or matched devices.
The save button enables a user to save the results of the locate operation to a file. Tapping this button will present a modal dialog in which save options are specified prior to the actual creation of a saved file.
The detail and clear list buttons have the same function on the locate tab 432 as on the inventory tab 430.
The tools tab 434 is employed to access diagnostic utilities of the PDA 420. In one embodiment, a card information button is toggled to display a modal dialog regarding information on the device RFID tag 60 or the SD card.
The help tab 436 stores information on the software version and support information. In one embodiment, the help tab 436 is non-interactive.
In one embodiment, moving files from the PDA 420 to the GUI 66 employs synchronization software that is best accessed when the PDA 420 is docked in the cradle 422 (
With this in mind, an X-Y-Z coordinate system is imposed on the antenna pad 62 near an approximate center of the antenna 62a with Z=0 at a surface of the antenna pad 62. The perimeter of the antenna 62a is associated with coordinates X1, Y1 in the plane of the antenna pad 62. An outermost extent of each of the cartridges 402a-402d is associated with coordinates X2, Y2, Z2. For example, the data storage device 402a presents an outermost corner positioned at coordinates X2, Y2, Z2. Following this convention, the data storage device 402c presents an outermost corner of the cartridge located at −X2, −Y2, Z2. It is desired to optimize the field output from the antenna 62a to ensure that all of the device RFID tags 60 are readable by the antenna 62a, even if the tags 60 are placed at the outermost corners, and to minimize the far field emission from antenna 62a in compliance with various governmental regulations.
Table 1 provides exemplary dimensions (in meters) for sizing the antenna 62a to minimize far field emissions, and provides dimensions that result in maximizing the output of the antenna 62a. A separate set of dimensions is provided for minimizing the conductance (Q) of antenna 62a. Note that the dimensions in Table 1 are positive, such that an entire X axis dimension for a size of the antenna 62a is obtained by calculating the distance between the minus X position (−X) and the positive X axis dimension (+X) in reference to
With reference to Table 1, in one embodiment the antenna 62a is sized to have an X axis dimension of about 480 mm and a Y axis dimension of about 280 mm to minimize far field emission from the antenna 62a. In another embodiment, the antenna 62a is sized to have an X axis dimension of about 700 mm and a Y axis dimension of about 500 mm to maximize the output of the antenna 62a relative to the current through the antenna 62a. It is desired, in general, to configure the antenna 62a to have dimensions roughly within these parameters in balancing the power/range of the antenna 62a with the emitted field of the antenna 62a. To this end, one of skill in the art of antennas will readily recognize that other dimensions for the antenna 62a are also acceptable.
In one embodiment, the base insert 408 includes a plurality of device slots 452 and defines relief portions 454a, 454b, 45c that are sized to mate with projections 456a, 456b, 456c, respectively, extending from an interior of the base portion 416. Each of the device slots 452 is sized to frictionally retain an individual one of the data storage devices 402 in a manner that orients the device RFID tag 60 perpendicular to the field that is generated by the pad antenna 62 (
The cover insert 440′ is preferably durably retained within the cover 414 and defines a plurality of device slots 442′ that are sized to frictionally engage one end of a device 402 when the cover 414 is closed over the devices 402. In this manner, the cover insert 440′ is similar to the cover insert described in
The base insert 486 includes a pair of foldable panels 487a and 487b hinged about an approximate central spine 488. Each of the panels 487a, 487b defines a respective seat portion 489a, 489b and opposing wings 490a, 491a and 490b, 491b that fold relative to the seat portions 489a, 489b. The seat portion 489a and the opposing wings 490a, 491a define device separators 492a. When the opposing wings 490a, 491a are folded over devices 402 placed in the seat portion 489a, the separators 492a separate the devices 402 for retention within a device slot 494a. In a similar manner, the seat portion 489b and the opposing wings 490b, 491b define device separators 492b such that when the opposing wings 490b, 491b are folded over devices 402 placed in the seat portion 489b, the separators 492b separate the devices 402 for retention within a device slot 494b. An outer side of each panel 487a, 487b defines a flange 495a, 495b, respectively, that is configured to be retained within lips 496 formed within the base 416.
The base insert 486 is formed of thermoplastic materials and can be formed in a variety of processes, such as blow molding, injection molding, press molding or other thermoplastic fabrication processes. In one embodiment, the base insert 486 is molded of an ultra low density polyethylene film (or a really low density polyethylene RLDPE), although other suitable polymers are also acceptable. For example, in one embodiment the base insert 486 is formed of a foamed thermoplastic material. In one embodiment, the base insert 486 is formed to be compliant such that when the insert 486 is retained within the base 416 it offers vibration damping and shock absorption that is useful in protecting the devices 402.
In the folded configuration illustrated in
The label 508 in one embodiment is highly similar to the optical label 58 (
In one embodiment, it is desired that each of the first and second antennas 546, 548 include an antenna having dimensions of about 350 mm×420 mm, although it is to be understood that other sizes of antennas are suitable and within the scope of this invention. Certain larger cases are more effectively read by an antenna having dimensions of about 370 mm×470 mm, for example. To this end, one embodiment of the U-shaped antenna assembly 542 provides guides 550 that are configured to position the case 404 at a desired location within a read field of the U-shaped antenna assembly 542.
In one embodiment, the adjustable antenna support 642 is height-adjustable, and the hinged antenna 646 is configured to move in an arc 652 of at least 90 degrees relative to the adjustable antenna support 642. The antennas 646, 648 are sized to ensure radiofrequency reading of randomly oriented multiple data storage devices 402 stored in a generalized metallic case 404, for example. With this in mind, in an exemplary embodiment the hinged antenna 646 and the fixed antenna 648 each includes an antenna area of about 350 mm×390 mm.
Metallic cases 404 can interfere with RFID reading of the device RFID tags 60 (
In another embodiment, the antenna support 642 includes an embedded antenna (not shown) that is substantially similar to the antennas described above and configured to provide a field orthogonal to the fields generated by the antennas 646, 648. In this manner, the magnetic fields produced by the reader system 640 produce an optimized output with a minimum level of far field emissions.
The flip antenna assembly 704 includes a first panel 710 and a second panel 712 that is rotatably connected to the first panel 710 along a hinged spine 714, for example. The first panel 710 includes the first antenna surface 702 provided with an embedded antenna 702a, the combination of which is configured to receive the case 404 and read the device RFID tags 60 attached to the storage devices 402. The first panel 710 is configured to rotate away from, and off of, the second panel 712 to produce intersecting RFID read fields. In this manner, two orthogonal fields are generated emanating from the first and second panels 710, 712, respectively, as best illustrated in
The antennas within the panels 710, 712 are substantially similar to the antennas described above, including the antenna 62a (
The panels 710, 712 described above are configured to produce a maximum magnetic field output from the antennas 702a, 716 while minimizing the far field emissions in a region near the reader system 700. In particular, since the panel 710 can be rotated relative to the panel 712, the field output from the respective antennas 702a, 716 is orientation-variable, and thus adjustable, to enable optimizing the emitted field. In this manner, the device RFID tags 60 are “readable” even if the case 404, or metal in a data storage device, interferes with the fields, or is less than optimally positioned relative to the reader system 700.
The reader system 740 includes a portable antenna 742 in communication with the pad antenna 62a and the reader unit 64 of the reader system 54 illustrated in
In the embodiments described above, the reader systems can employ separate read and write antennas. In this regard, multiple antennas may be used with a reader system, particularly to increase a read range without exceeding regulated electromagnetic field limits. Recall, in some jurisdictions government regulations specify limits for maximum electromagnetic field strength, and it can be desirable to have multiple (and less powerful) antennas that each are within the field guidelines where each antenna contributes to the read field of the reader system. In this regard, the multiple antennas used in the reader systems described above will increase the read range of the RFID reader without exceeding field limits.
In particular, the flow chart 800 provides a process 802 for selecting one or more data storage devices for transport. In this regard, transport could include transit from a facility (such as backup devices leaving a business office for storage), or transit into a facility (such as backup devices returning to the business office from a secure storage site). Process 804 provides for reading (optically and/or electronically) each selected data storage device 402. It is to be understood that each device 402 includes the device RFID tag 60 described above. The reader system 54 is operable to RFID read/identify one or multiple of the devices 402 that are on or within a field that is generated by the pad antenna 62. In this manner, the unique 64 bit tag ID, the RFID revision field, the volser number, the CRC check sum, the cartridge manufacturer's serial number, and/or any other user-defined field that is electronically stored on the chip 142 (
Thereafter, the GUI 66 is operable to create a report that indicates the selected storage devices 402 are in transit, or scheduled for transit, or have been received, or are scheduled to be received. As a point of reference, the GUI 66 might create a report that indicates one or more of the devices 402 has not been correctly read, or has not been read at all. Loop 808 illustrates the use of the portable reader device 420 employed to selectively read and confirm the presence of one or more such devices 402.
After the report has been created by the GUI 66, a user is able to operate the GUI 66 to compile the report in process 810. In one embodiment, process 810 compiles the report and is operable to write a file electronically to the GUI 66 that is stored or transferred to other systems/networks. For example, in one embodiment the user employs the process 810 to compile a report in a spreadsheet application, or in a word processing application or other program suited for data processing. The report is file-shared with the originator of the devices 402 to inform the originator that the devices 402 are being traced. In this regard, the file-sharing can be network-based and/or sent automatically via the Internet, for example.
Process 812 provides for verifying transit and disposition of each of the data storage devices 402 identified in the compiled report. For example, in one embodiment the process 812 sends an e-mail to the user and to an intended recipient notifying each that the selected data storage devices have been scheduled for transit and are expected to arrive at the indicated/selected terminus at a projected time. Loop 814 provides for redundancy checking and the verification of the transit of the data storage devices 402 by double checking with the compiled report and process 810.
Flowchart 800 illustrates but one embodiment of the electronic data storage device tracing system 50 employed to identify and trace data storage devices. Those with skill in the art of data generation and protection will recognize that the systems described above are operable in any number of ways to sense/read/write RFID tags located within an electromagnetic field of an antenna, and trace and report on the tracing of the devices to which the tags are attached.
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific embodiments of data storage device tracing and tracking systems discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof.
