Patent Publication Number: US-2023140361-A1

Title: Noncontact communication medium for recording medium cartridge, recording medium cartridge, and method for manufacturing noncontact communication medium for recording medium cartridge

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Application No. 2021-178341, filed Oct. 29, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     Technical Field 
     A technique of the present disclosure relates to a noncontact communication medium for a recording medium cartridge, a recording medium cartridge, and a method for manufacturing a noncontact communication medium for a recording medium cartridge. 
     Related Art 
     WO2019/193829A describes a cartridge memory for a recording medium cartridge. The cartridge memory comprises a memory unit that has a memory capacity capable of storing management information regarding a second information recording medium configured to record information with a second data track number greater than a first data track number, and a capacity setting unit configured to be capable of setting a data storage area limited to a first capacity capable of storing management information regarding a first information recording medium configured to record information with the first data track number, in the memory unit. 
     JP2001-266534A described a single reel type tape cartridge in which one reel  2  with a tape  3  wound thereon is disposed inside a case body  1 , and a noncontact memory cartridge M is disposed in a loading unit  10  provided inside the case body  1 . In the tape cartridge, a loading slot  23  for loading the memory cartridge M from a case external surface is opened in a case peripheral wall facing the loading unit  10 , an engagement structure that undetachably engages and fixes the memory cartridge M inserted into and loaded in the loading unit  10  is provided between the loading unit  10  and the memory cartridge M, and the memory cartridge M can be assembled later to the loading unit  10  from the case external surface side. 
     SUMMARY 
     An embodiment according to the technique of the present disclosure provides a noncontact communication medium for a recording medium cartridge, a recording medium cartridge, and a method for manufacturing a noncontact communication medium for a recording medium cartridge that enable relaxation of stress in an IC chip due to deformation of a substrate. 
     A first aspect according to the technique of the present disclosure is a noncontact communication medium for a recording medium cartridge comprising a substrate, an IC chip that is electrically connected to one end and the other end of an antenna coil formed on the substrate and configured to induce power with application of a magnetic field from an outside, and a stress relaxing member that is provided between the IC chip and the substrate. 
     A second aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to the first aspect, in which the stress relaxing member is formed of metal. 
     A third aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to the second aspect, in which the metal is the same as metal that forms the antenna coil. 
     A fourth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to the second aspect or the third aspect, in which the metal is copper or a copper alloy. 
     A fifth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the second aspect to the fourth aspect, in which the stress relaxing member is formed as a print pattern. 
     A sixth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the fifth aspect, in which the IC chip has a quadrangular shape in plan view, and the stress relaxing member is provided at positions corresponding to four corners of the IC chip in plan view of the IC chip. 
     A seventh aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the fifth aspect, in which the IC chip has a quadrangular shape in plan view, and the stress relaxing member is provided along opposite sides of the IC chip in plan view of the IC chip. 
     An eighth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the fifth aspect, in which the stress relaxing member is provided at a position corresponding to a whole of the IC chip in plan view of the IC chip. 
     A ninth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the fifth aspect, in which the stress relaxing member is provided at a position corresponding to an outer peripheral portion of the IC chip in plan view of the IC chip. 
     A tenth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the ninth aspect, in which the IC chip has a storage capacity of equal to or greater than 32 kB. 
     An eleventh aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the tenth aspect, in which a ratio of a maximum outer shape dimension of the IC chip to a long side dimension of the substrate is equal to or greater than 25%. 
     A twelfth aspect according to the technique of the present disclosure is the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the eleventh aspect, in which the substrate is a flexible substrate. 
     A thirteenth aspect according to the technique of the present disclosure is a recording medium cartridge comprising the noncontact communication medium for a recording medium cartridge according to any one of the first aspect to the twelfth aspect. 
     A fourteenth aspect according to the technique of the present disclosure is a method for manufacturing a noncontact communication medium for a recording medium cartridge, the method comprising forming a stress relaxing member on a substrate, and mounting an IC chip electrically connectable to one end and the other end of an antenna coil formed on the substrate and configured to induce power with application of a magnetic field from an outside, on the substrate through the stress relaxing member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic perspective view showing an example of the appearance of a magnetic tape cartridge according to an embodiment. 
         FIG.  2    is a schematic perspective view showing an example of the structure of a rear right end portion inside a lower case of the magnetic tape cartridge according to the embodiment. 
         FIG.  3    is a side cross-sectional view showing an example of a support member provided on an inner surface of the lower case of the magnetic tape cartridge according to the embodiment. 
         FIG.  4    is a schematic configuration diagram showing an example of the hardware configuration of the magnetic tape drive according to the embodiment. 
         FIG.  5    is a schematic perspective view showing an example of an aspect in which a magnetic field is discharged from a lower side of the magnetic tape cartridge according to the embodiment by a noncontact reading and writing device. 
         FIG.  6    is a conceptual diagram showing an example of an aspect in which a magnetic field is applied from the noncontact reading and writing device to a cartridge memory in the magnetic tape cartridge according to the embodiment. 
         FIG.  7    is a bottom view showing an example of a back surface structure of the cartridge memory according to the embodiment. 
         FIG.  8    is a top view showing an example of a front surface structure of the cartridge memory according to the embodiment. 
         FIG.  9    is a sectional view of the cartridge memory shown in  FIG.  8    taken along a line A-A. 
         FIG.  10    is an explanatory view showing an example of a manufacturing method of the cartridge memory according to the embodiment. 
         FIG.  11    is a top view showing an example of a front surface structure of a cartridge memory according to a modification example. 
         FIG.  12    is a top view showing an example of a front surface structure of a cartridge memory according to a modification example. 
         FIG.  13    is a sectional view of the cartridge memory shown in  FIG.  12    taken along a line B-B. 
         FIG.  14    is a top view showing an example of a front surface structure of a cartridge memory according to a modification example. 
     
    
    
     DETAILED DESCRIPTION 
     First, terms that are used in the following description will be described. 
     CPU is an abbreviation for “Central Processing Unit”. RAM is an abbreviation for “Random Access Memory”. NVM is an abbreviation for “Non-Volatile Memory”. ROM is an abbreviation for “Read Only Memory”. EEPROM is an abbreviation for “Electrically Erasable and Programmable Read Only Memory”. SSD is an abbreviation for “Solid State Drive”. USB is an abbreviation for “Universal Serial Bus”. ASIC is an abbreviation for “Application Specific Integrated Circuit”. PLD is an abbreviation for “Programmable Logic Device”. FPGA is an abbreviation for “Field-Programmable Gate Array”. SoC is an abbreviation for “System-on-a-Chip”. IC is an abbreviation for “Integrated Circuit”. RFID is an abbreviation for “Radio Frequency IDentifier”. 
     In the following description, for convenience of description, in  FIG.  1   , a loading direction of a magnetic tape cartridge  10  in a magnetic tape drive  30  (see  FIG.  4   ) is indicated by an arrow A, a direction of the arrow A is referred to a front direction of the magnetic tape cartridge  10 , and a side in the front direction of the magnetic tape cartridge  10  is referred to as a front side of the magnetic tape cartridge  10 . In the following description on the structure, “front” indicates the front side of the magnetic tape cartridge  10 . 
     In the following description, for convenience of description, in  FIG.  1   , a direction of an arrow B perpendicular to the direction of the arrow A is referred to as a right direction, and a side in the right direction of the magnetic tape cartridge  10  is referred to as a right side of the magnetic tape cartridge  10 . In the following description on the structure, “right” indicates the right side of the magnetic tape cartridge  10 . 
     In the following description, for convenience of description, in  FIG.  1   , a direction perpendicular to the direction of the arrow A and the direction of the arrow B is indicated by an arrow C, a direction of the arrow C is referred to as an upper direction of the magnetic tape cartridge  10 , and a side in the upper direction of the magnetic tape cartridge  10  is referred to as an upper side of the magnetic tape cartridge  10 . In the following description on the structure, “upper” indicates the upper side of the magnetic tape cartridge  10 . 
     In the following description, for convenience of description, in  FIG.  1   , a direction opposite to the front direction of the magnetic tape cartridge  10  is referred to as a rear direction of the magnetic tape cartridge  10 , and a side in the rear direction of the magnetic tape cartridge  10  is referred to as a rear side of the magnetic tape cartridge  10 . In the following description on the structure, “rear” indicates the rear side of the magnetic tape cartridge  10 . 
     In the following description, for convenience of description, in  FIG.  1   , a direction opposite to the upper direction of the magnetic tape cartridge  10  is referred to as a lower direction of the magnetic tape cartridge  10 , and a side in the lower direction of the magnetic tape cartridge  10  is referred to as a lower side of the magnetic tape cartridge  10 . In the following description on the structure, “lower” indicates the lower side of the magnetic tape cartridge  10 . 
     As shown in  FIG.  1    as an example, the magnetic tape cartridge  10  has a substantially rectangular shape in plan view, and comprises a box-shaped case  12 . The magnetic tape cartridge  10  is an example of a “recording medium cartridge” according to the technique of the present disclosure. The case  12  is formed of resin, such as polycarbonate, and comprises an upper case  14  and a lower case  16 . The upper case  14  and the lower case  16  are bonded by welding (for example, ultrasonic welding) and screwing in a state in which a lower peripheral edge surface of the upper case  14  and an upper peripheral edge surface of the lower case  16  are brought into contact with each other. A bonding method is not limited to welding and screwing, and other bonding methods may be used. 
     Inside the case  12 , a cartridge reel  18  is rotatably housed. The cartridge reel  18  comprises a reel hub  18 A, an upper flange  18 B 1 , and a lower flange  18 B 2 . The reel hub  18 A is formed in a cylindrical shape. The reel hub  18 A is a shaft center portion of the cartridge reel  18 , has a shaft center direction along an up-down direction of the case  12 , and is disposed in a center portion of the case  12 . Each of the upper flange  18 B 1  and the lower flange  18 B 2  is formed in an annular shape. A center portion in plan view of the upper flange  18 B 1  is fixed to an upper end portion of the reel hub  18 A, and a center portion in plan view of the lower flange  18 B 2  is fixed to a lower end portion of the reel hub  18 A. A magnetic tape MT is wound around an outer peripheral surface of the reel hub  18 A, and an end portion in a width direction of the magnetic tape MT is held by the upper flange  18 B 1  and the lower flange  18 B 2 . The reel hub  18 A and the lower flange  18 B 2  may be molded integrally. 
     An opening  12 B is formed on a front side of a right wall  12 A of the case  12 . The magnetic tape MT is pulled out from the opening  12 B. 
     As an example, as shown in  FIG.  2   , a cartridge memory  19  is housed in a rear right end portion of the lower case  16 . The cartridge memory  19  is an example of a “noncontact communication medium” according to the technique of the present disclosure. In the embodiment, a so-called passive type RFID tag is employed as the cartridge memory  19 . 
     Management information is stored in the cartridge memory  19 . The management information is information for managing the magnetic tape cartridge  10 . Examples of the management information include identification information capable of specifying the magnetic tape cartridge  10 , a recording capacity of the magnetic tape MT, the outline of information (hereinafter, referred to as “recorded information”) recorded on the magnetic tape MT, items of the recorded information, and information indicating a recording format and the like of the recorded information. 
     The cartridge memory  19  performs communication with an external device (not shown) in a noncontact manner. Examples of the external device include a reading and writing device that is used in a production process of the magnetic tape cartridge  10  and a reading and writing device (for example, a noncontact reading and writing device  50  shown in  FIGS.  4  to  6   ) that is used in a magnetic tape drive (for example, the magnetic tape drive  30  shown in  FIG.  4   ). 
     The external device performs reading and writing of various kinds of information to the cartridge memory  19  in a noncontact manner. Although details will be described below, the cartridge memory  19  generates power with electromagnetic application to a magnetic field from the external device. Then, the cartridge memory  19  operates using the generated power and performs transfer of various kinds of information with the external device by performing communication with the external device through the magnetic field. 
     As an example, as shown in  FIG.  2   , a support member  20  is provided on an inner surface of a bottom plate  16 A in the rear right end portion of the lower case  16 . The support member  20  is a pair of inclined mounts that supports the cartridge memory  19  from below in an inclined state. A pair of inclined mounts is a first inclined mount  20 A and a second inclined mount  20 B. The first inclined mount  20 A and the second inclined mount  20 B are disposed at an interval in a right-left direction of the case  12  and are modularized in an inner surface of a rear wall  16 B of the lower case  16  and the inner surface of the bottom plate  16 A. The first inclined mount  20 A has an inclined surface  20 A 1 , and the inclined surface  20 A 1  is inclined downward from the inner surface of the rear wall  16 B toward the inner surface of the bottom plate  16 A. An inclined surface  20 B 1  is also inclined downward from the inner surface of the rear wall  16 B toward the inner surface of the bottom plate  16 A. 
     In front of the support member  20 , a pair of position restriction ribs  22  is disposed at an interval in the right-left direction. A pair of position restriction ribs  22  is provided upright on the inner surface of the bottom plate  16 A and restricts a position of a lower end portion of the cartridge memory  19  in a state of being disposed on the support member  20 . 
     As an example, as shown in  FIG.  3   , a reference surface  16 A 1  is formed on an outer surface of the bottom plate  16 A. The reference surface  16 A 1  is a plane. Here, the plane indicates a surface parallel to a horizontal plane in a case where the lower case  16  is placed on the horizontal plane such that the bottom plate  16 A turns toward a lower side. An inclination angle θ of the support member  20 , that is, an inclination angle of each of the inclined surface  20 A 1  and the inclined surface  20 B 1  is  45  degrees with respect to the reference surface  16 A 1 . The inclination angle of 45 degrees is merely an example, and may be in a range of “0 degrees &lt;inclination angle θ&lt;45 degrees” or may be equal to or greater than 45 degrees. 
     The cartridge memory  19  comprises a substrate  26 . The substrate  26  is an example of a “substrate” according to the technique of the present disclosure. The substrate  26  is a flexible substrate. The substrate  26  has a quadrangular flat plate shape in which each corner portion is chamfered in an arc shape as an example. The substrate  26  has two surfaces in a thickness direction, that is, a front surface  26 A and a back surface  26 B. The substrate  26  is placed on the support member  20  such that the back surface  26 B of the substrate  26  turns toward a lower side, and the support member  20  supports the back surface  26 B of the substrate  26  from below. A part of the back surface  26 B of the substrate  26  is in contact with the inclined surface of the support member  20 , that is, the inclined surfaces  20 A 1  and  20 B 1 , and the front surface  26 A of the substrate  26  is exposed to an inner surface  14 A 1  side of a top plate  14 A. 
     The upper case  14  comprises a plurality of ribs  24 . A plurality of ribs  24  are disposed at intervals in the right-left direction of the case  12 . A plurality of ribs  24  are provided to protrude downward from the inner surface  14 A 1  of the top plate  14 A of the upper case  14 , and a distal end surface  24 A of each rib  24  has an inclined surface corresponding to the inclined surfaces  20 A 1  and  20 B 1 . That is, the distal end surface  24 A of each rib  24  is inclined at 45 degrees with respect to the reference surface  16 A 1 . 
     In a case where the upper case  14  is bonded to the lower case  16  as described above in a state in which the cartridge memory  19  is disposed on the support member  20 , the distal end surface  24 A of each rib  24  comes into contact with the substrate  26  from the front surface  26 A side, and the substrate  26  is pinched by the distal end surface  24 A of each rib  24  and the inclined surface of the support member  20 . With this, a position in an up-down direction of the cartridge memory  19  is restricted by the ribs  24 . 
     As an example, as shown in  FIG.  4   , the magnetic tape drive  30  comprises a transport device  34 , a reading head  36 , and a control device  38 . The magnetic tape cartridge  10  is loaded into the magnetic tape drive  30 . The magnetic tape drive  30  is a device that pulls out the magnetic tape MT from the magnetic tape cartridge  10  and reads recorded information from the pulled-out magnetic tape MT using the reading head  36  by a linear serpentine method. In the embodiment, in order words, reading of the recorded information indicates reproduction of the recorded information. 
     The control device  38  controls the entire magnetic tape drive  30 . In the embodiment, although the control device  38  is realized by an ASIC, the technique of the present disclosure is not limited thereto. For example, the control device  38  may be realized by an FPGA. Alternatively, the control device  38  may be realized by a computer including a CPU, a ROM, and a RAM. In addition, the control device  38  may be realized by combining two or more of an ASIC, an FPGA, a PLD, and a computer. That is, the control device  38  may be realized by a combination of a hardware configuration and a software configuration. 
     The transport device  34  is a device that selectively transports the magnetic tape MT in a forward direction and a backward direction, and comprises a sending motor  40 , a winding reel  42 , a winding motor  44 , a plurality of guide rollers GR, and the control device  38 . 
     The sending motor  40  rotationally drives the cartridge reel  18  in the magnetic tape cartridge  10  under the control of the control device  38 . The control device  38  controls the sending motor  40  to control a rotation direction, a rotation speed, rotation torque, and the like of the cartridge reel  18 . 
     The winding motor  44  rotationally drives the winding reel  42  under the control of the control device  38 . The control device  38  controls the winding motor  44  to control a rotation direction, a rotation speed, rotation torque, and the like of the winding reel  42 . 
     In a case where the magnetic tape MT is wound around the winding reel  42 , the sending motor  40  and the winding motor  44  are rotated by the control device  38  such that the magnetic tape MT runs in the forward direction. Rotation speeds, rotation torque, and the like of the sending motor  40  and the winding motor  44  are adjusted depending on a speed of the magnetic tape MT wound around the winding reel  42 . 
     In a case where the magnetic tape MT is rewound to the cartridge reel  18 , the sending motor  40  and the winding motor  44  are rotated by the control device  38  such that the magnetic tape MT runs in the backward direction. Rotation speeds, rotation torque, and the like of the sending motor  40  and the winding motor  44  are adjusted depending on a speed of the magnetic tape MT wound around the winding reel  42 . 
     The rotation speed, the rotation torque, and the like of each of the sending motor  40  and the winding motor  44  are adjusted in this manner, whereby tension in a predetermined range is applied to the magnetic tape MT. Here, the predetermined range indicates, for example, a range of tension obtained from at least one of a computer simulation, a test with a real machine, or the like as a range of tension in which data can be read from the magnetic tape MT by the reading head  36 . 
     In the embodiment, although the rotation speed, the rotation torque, and the like of each of the sending motor  40  and the winding motor  44  are controlled such that the tension of the magnetic tape MT is controlled, the technique of the present disclosure is not limited thereto. For example, the tension of the magnetic tape MT may be controlled using a dancer roller or may be controlled by drawing the magnetic tape MT to a vacuum chamber. 
     Each of a plurality of guide rollers GR is a roller that guides the magnetic tape MT. A running path of the magnetic tape MT is determined by separately disposing a plurality of guide rollers GR at positions straddling over the reading head  36  between the magnetic tape cartridge  10  and the winding reel  42 . 
     The reading head  36  comprises a reading element  46  and a holder  48 . The reading element  46  is held by the holder  48  to come into contact with the magnetic tape MT during running, and reads recorded information from the magnetic tape MT transported by the transport device  34 . 
     The magnetic tape drive  30  comprises the noncontact reading and writing device  50 . The noncontact reading and writing device  50  is an example of an “outside” according to the technique of the present disclosure. The noncontact reading and writing device  50  is disposed to confront the back surface  26 B of the cartridge memory  19  below the magnetic tape drive  30  in a state in which the magnetic tape cartridge  10  is loaded. The state in which the magnetic tape cartridge  10  is loaded into the magnetic tape drive  30  indicates, for example, a state in which the magnetic tape cartridge  10  reaches a position determined in advance as a position where reading of recorded information from the magnetic tape MT by the reading head  36  starts. 
     As an example, as shown in  FIG.  5   , the noncontact reading and writing device  50  emits a magnetic field MF from below the magnetic tape cartridge  10  toward the cartridge memory  19 . The magnetic field MF passes through the cartridge memory  19 . The magnetic field MF is an example of a “magnetic field” according to the technique of the present disclosure. 
     As an example, as shown in  FIG.  6   , the noncontact reading and writing device  50  is connected to the control device  38 . The control device  38  outputs a control signal for controlling the cartridge memory  19  to the noncontact reading and writing device  50 . The noncontact reading and writing device  50  emits the magnetic field MF toward the cartridge memory  19  in response to the control signal input from the control device  38 . The magnetic field MF passes through the cartridge memory  19  from the back surface  26 B side to the front surface  26 A side. 
     The noncontact reading and writing device  50  spatially transmits a command signal to the cartridge memory  19  under the control of the control device  38 . The command signal is a signal indicating a command to the cartridge memory  19 . In a case where the command signal is spatially transmitted from the noncontact reading and writing device  50  to the cartridge memory  19 , the command signal spatially transmitted from the noncontact reading and writing device  50  is included in the magnetic field MF in response to an instruction from the control device  38 . In other words, the command signal is superimposed on the magnetic field MF. That is, the noncontact reading and writing device  50  transmits the command signal to the cartridge memory  19  through the magnetic field MF under the control of the control device  38 . 
     As shown in  FIG.  7    as an example, a coil  60  is formed in a loop shape on the back surface  26 B of the cartridge memory  19 . Here, as a material of the coil  60 , copper foil is employed. The coil  60  induces an induced current with application of the magnetic field MF (see  FIGS.  5  and  6   ) from the noncontact reading and writing device  50 . Here, although an example where the coil  60  is formed on the back surface  26 B of the cartridge memory  19  has been shown, this is merely an example, and the coil  60  may be formed to be buried in the substrate  26  of the cartridge memory  19 . The coil  60  is an example of an “antenna coil” according to the technique of the present disclosure. 
     A first conduction portion  62 A and a second conduction portion  62 B are provided on the back surface  26 B of the cartridge memory  19 . The first conduction portion  62 A and the second conduction portion  62 B have solder, and electrically connect both end portions of the coil  60  to an IC chip  52  on the front surface  26 A. The first conduction portion  62 A and the second conduction portion  62 B are an example of “one end and the other end of an antenna coil” according to the technique of the present disclosure. 
     As shown in  FIG.  8    as an example, the IC chip  52  is mounted on the front surface  26 A of the cartridge memory  19 . On the front surface  26 A of the cartridge memory  19 , the IC chip  52  is electrically connected to the first conduction portion  62 A and the second conduction portion  62 B. Specifically, a first lead  102 A that is one of a pair of leads protruding from the IC chip  52  is soldered to the first conduction portion  62 A, and a second lead  102 B that is the other lead of a pair of leads is soldered to the second conduction portion  62 B. The IC chip  52  is an example of an “IC chip” according to the technique of the present disclosure. 
     As shown in  FIG.  8    as an example, the IC chip  52  is mounted on the substrate  26  through a stress relaxing member  28 . As shown in  FIG.  8    as an example, the IC chip  52  has a quadrangular shape in plan view. The IC chip  52  has a maximum outer shape dimension L 1  (that is, a length of a diagonal line) equal to or greater than 2.5 mm. Along side dimension L 2  of the substrate  26  is 10 mm. Accordingly, a ratio (that is, L 1 /L 2 ) of the maximum outer shape dimension L 1  of the IC chip  52  to the long side dimension L 2  of the substrate  26  is equal to or greater than 25%. 
     The stress relaxing member  28  is provided at positions corresponding to four corners of the IC chip  52  having a quadrangular shape in plan view of the IC chip  52 . That is, four stress relaxing members  28  are provided, and stress relaxing members  28 A,  28 B,  28 C, and  28 D support the four corners of the IC chip  52 , respectively. 
     As shown in  FIG.  8    as an example, the stress relaxing members  28 A,  28 B,  28 C, and  28 D have a quadrangular shape. While an area of each of the stress relaxing members  28 A,  28 B,  28 C, and  28 D in plan view is not particularly limited, such an area that a region including each of the four corners of the IC chip  52  is supported and stress transmitted from the substrate  26  can be relaxed should be secured. 
     As shown in  FIG.  9    as an example, the stress relaxing member  28  is provided between the IC chip  52  and the substrate  26 . The stress relaxing member  28  has a rectangular parallelepiped shape protruding from the substrate  26  toward the IC chip  52 . A distance h (that is, a thickness of the stress relaxing member  28 ) at which the stress relaxing member  28  protrudes from the substrate  26  is about  30  The IC chip  52  and the stress relaxing member  28  are adhered through an adhesive (not shown). 
     The stress relaxing member  28  is formed of metal as an example. Specifically, the stress relaxing member  28  is formed of the same metal as metal that forms the coil  60 . “same” used herein indicates same in a meaning including an error that is generally allowed in the technical field to which the technique of the present disclosure belongs, in addition to completely same. 
     The stress relaxing member  28  is formed of copper foil as an example. While an ingredient of copper foil is not particularly limited, for example, single copper (that is, industrial native copper) may be used or a copper alloy in which copper is a main ingredient and other elements are added may be used. 
     The stress relaxing member  28  is further formed as a print pattern. That is, the stress relaxing member  28  is formed as a print pattern as well in a process in which the coil  60  is formed. Specifically, the stress relaxing member  28  is formed as a print pattern on the substrate  26  using a known photolithography technique. 
     As shown in  FIG.  9    as an example, a case where bending stress with deflection to the substrate  26  is generated is considered. In this case, as shown in  FIG.  9    as an example, the stress relaxing member  28  relaxes stress transmitted from the substrate  26 . Specifically, the stress relaxing member  28  expands and contracts due to stress transmitted from the substrate  26  to relax stress. As a result, generation of stress to the IC chip  52  with deformation of the substrate  26  is suppressed. 
     The IC chip  52  comprises a computer (not shown). The computer comprises a CPU, an NVM, and a RAM (all are not shown). The program for a magnetic tape cartridge and the management information are stored in the NVM. The CPU controls the operation of the cartridge memory  19  by reading the program from the NVM and executing the program on the RAM. A storage capacity of the NVM is equal to or greater than 32 kB. That is, a storage capacity of the IC chip  52  is equal to or greater than 32 kB. 
     Next, a manufacturing process of the noncontact communication medium according to the embodiment will be described referring to  FIG.  10   . 
     In the manufacturing process of the noncontact communication medium shown in  FIG.  10    as an example, first, in Step ST 101 , the coil  60  is formed on the substrate  26 . Thereafter, the manufacturing process progresses to Step ST 103 . 
     In Step ST 103 , the IC chip  52  is positioned on the substrate  26 . Thereafter, the manufacturing process progresses to Step ST 105 . 
     In Step ST 105 , the stress relaxing member  28  is formed on the substrate  26  based on a position of the IC chip  52  positioned in Step ST 103 . Thereafter, the manufacturing process progresses to Step ST 107 . 
     In Step ST 107 , the IC chip  52  is mounted on the substrate  26  through the stress relaxing member  28  formed in Step ST 105 . With this, the manufacturing process of the noncontact communication medium ends. 
     As described above, in the cartridge memory  19  according to the embodiment, the stress relaxing member  28  is provided between the IC chip  52  and the substrate  26 . Therefore, according to this configuration, stress in the IC chip  52  due to deformation of the substrate  26  is relaxed, compared to a case where the IC chip  52  is attached directly onto the substrate  26 . 
     In the cartridge memory  19 , the stress relaxing member  28  is formed of metal. 
     Therefore, according to this configuration, since ductility of metal is used for stress relaxation, stress in the IC chip  52  due to deformation of the substrate  26  is relaxed, compared to a case where the stress relaxing member  28  is formed of a material other than metal. 
     In the cartridge memory  19 , the metal that forms the stress relaxing member  28  is the same as the metal that forms the coil  60 . Therefore, according to this configuration, the stress relaxing member  28  is easily formed, compared to a case where metal different from the coil  60  is used as the stress relaxing member  28 . As a result, improvement of the productivity of the cartridge memory  19  can be expected. 
     In the cartridge memory  19 , the metal that forms the stress relaxing member  28  is copper or a copper alloy. Therefore, according to this configuration, the stress relaxing member  28  is easily formed, compared to a case where metal other than copper is a main ingredient as the stress relaxing member  28 . As a result, improvement of the productivity of the cartridge memory  19  can be expected. 
     In the cartridge memory  19 , the stress relaxing member  28  is formed as a print pattern. Therefore, according to this configuration, the stress relaxing member  28  is easily formed, compared to a case where the stress relaxing member  28  is attached as a separate component. As a result, improvement of the productivity of the cartridge memory  19  can be expected. 
     In the cartridge memory  19 , the IC chip  52  has a quadrangular shape in plan view, and the stress relaxing member  28  is provided at the positions corresponding to the four corners of the IC chip  52  in plan view of the IC chip  52 . Therefore, according to this configuration, stress due to deformation of the substrate  26  easily escapes and stress in the IC chip  52  is relaxed, compared to a case where the stress relaxing member  28  is provided in a central portion of the IC chip  52 . 
     In the cartridge memory  19 , the IC chip  52  has the storage capacity equal to or greater than 32 kB. Therefore, according to this configuration, compared to a case where the storage capacity of the IC chip  52  is less than 32 kB, even though the storage capacity of the IC chip  52  be equal to or greater than 32 kB to cause an increase in size of the IC chip  52 , stress in the IC chip  52  due to deformation of the substrate  26  is relaxed. 
     In the cartridge memory  19 , the ratio of the maximum outer shape dimension L 1  of the IC chip  52  to the long side dimension L 2  of the substrate  26  is equal to or greater than 25%. Therefore, according to this configuration, even though the IC chip  52  increases in size, stress in the IC chip  52  due to deformation of the substrate  26  is relaxed, compared to a case where the ratio of the maximum outer shape dimension L 1  of the IC chip  52  to the long side dimension L 2  of the substrate  26  is less than 25%. 
     In the cartridge memory  19 , the substrate  26  is a flexible substrate. Therefore, according to this configuration, stress in the IC chip due to deformation of the substrate  26  is relaxed, compared to a case where the substrate  26  is a rigid substrate. 
     First Modification Example 
     In the above-described embodiment, although a form example where the stress relaxing member  28  is provided at the positions corresponding to the four corners of the IC chip  52  has been described, the technique of the present disclosure is not limited thereto. In a first modification example, as shown in  FIG.  11    as an example, the stress relaxing member  28  is provided along opposite sides of the IC chip  52  in plan view of the IC chip  52 . 
     In the example shown in  FIG.  11   , stress relaxing members  28 E and  28 F are formed along a pair of long sides of the IC chip  52 . The stress relaxing members  28 E and  28 F have a rectangular parallelepiped shape having long sides along the long sides of the IC chip  52 . A length of each of the stress relaxing members  28 E and  28 F is set to be longer than a length of each of the long sides of the IC chip  52 . A width of each of the stress relaxing members  28 E and  28 F is set to fall within a range including each of the long sides of the IC chip  52 . That is, the stress relaxing members  28 E and  28 F support a pair of long sides of the IC chip  52 . 
     As described above, in the cartridge memory  19  according to the first modification example, the IC chip  52  has a quadrangular shape in plan view, and the stress relaxing member  28  is provided along the opposite sides of the IC chip  52  in plan view of the IC chip  52 . Therefore, according to this configuration, stress due to deformation of the substrate  26  easily escapes and stress in the IC chip  52  is relaxed, compared to a case where the stress relaxing member  28  is provided only in a part of the opposite sides of the IC chip  52 . 
     In the first modification example, although a form example where the stress relaxing member  28  is provided along a pair of long sides of the IC chip  52  has been described, the technique of the present disclosure is not limited thereto. For example, the stress relaxing member  28  may be provided along a pair of short sides of the IC chip  52 . 
     Second Modification Example 
     In the above-described embodiment, although a form example where the stress relaxing member  28  is provided partially with respect to the IC chip  52  has been described, the technique of the present disclosure is not limited thereto. In a second modification example, as shown in 
       FIG.  12    as an example, the stress relaxing member  28  is provided at a position corresponding to the whole of the IC chip  52  in plan view of the IC chip  52 . 
     As shown in  FIG.  12    as an example, a stress relaxing member  28 G is formed in a flat plate shape. The stress relaxing member  28 G has an area greater than the IC chip  52  in plan view of the IC chip  52 . That is, the stress relaxing member  28 G supports the whole surface of the IC chip  52  on the substrate  26  side. 
     As shown in  FIG.  13    as an example, a case where bending stress with deflection to the substrate  26  is generated is considered. In this case, as shown in  FIG.  13    as an example, the stress relaxing member  28  relaxes stress transmitted from the substrate  26 . Specifically, rigidity increases with the stress relaxing member  28  provided on the substrate  26  to relax stress. For example, the stress relaxing member  28  has rigidity equal to the IC chip  52  or equal to or higher than the IC chip  52 . The stress relaxing member  28  has rigidity equal to or higher than the substrate  26 , for example. That is, in a region of the substrate  26  where the stress relaxing member  28  is provided, deformation of the substrate  26  itself is suppressed. As a result, generation of stress to the IC chip  52  with deformation of the substrate  26  is suppressed. 
     As described above, in the cartridge memory  19  according to the second modification example, the stress relaxing member  28  is provided at the position corresponding to the whole of the IC chip  52  in plan view of the IC chip  52 . Therefore, according to this configuration, deformation itself of the substrate  26  is suppressed, such that stress in the IC chip  52  due to deformation of the substrate  26  is relaxed, compared to a case where the stress relaxing member  28  is provided at a position corresponding to a part of the IC chip  52 . 
     Third Modification Example 
     In the above-described embodiment, although a form example where the stress relaxing member  28  is provided at the position corresponding to the whole of the IC chip  52  in plan view of the IC chip  52  has been described, the technique of the present disclosure is not limited thereto. For example, as shown in  FIG.  14    as an example, the stress relaxing member  28  may be provided at a position corresponding to an outer peripheral portion of the IC chip  52 . 
     As shown in  FIG.  14    as an example, a stress relaxing member  28 H is formed in a quadrangular frame shape. The stress relaxing member  28 H is formed along the outer peripheral portion of the IC chip  52  in plan view of the IC chip  52 . That is, the stress relaxing member  28  supports the outer peripheral portion of the IC chip  52 . While a width of the stress relaxing member  28 H is not particularly limited, such a width that a region including the outer peripheral portion of the IC chip  52  can be supported should be set. 
     The stress relaxing member  28  relaxes stress transmitted from the substrate  26 . Specifically, rigidity increases with the stress relaxing member  28  provided on the substrate  26  to relax stress. For example, the stress relaxing member  28  has rigidity equal to the IC chip  52  or equal to or higher than the IC chip  52 . The stress relaxing member  28  has rigidity equal to or higher than the substrate  26 , for example. That is, in a region of the substrate  26  where the stress relaxing member  28  is provided, deformation of the substrate  26  itself is suppressed. As a result, generation of stress to the IC chip  52  with deformation of the substrate  26  is suppressed. Since the stress relaxing member  28  has a quadrangular frame shape, in other words, the stress relaxing member  28  is not formed in an inside portion of the quadrangular frame. Accordingly, deformation of the substrate  26  is not excessively suppressed. 
     As described above, in the cartridge memory  19  according to the third modification example, the stress relaxing member  28 H is provided at the position corresponding to the outer peripheral portion of the IC chip  52  in plan view of the IC chip  52 . Therefore, according to this configuration, deformation itself of the substrate  26  is suppressed, such that stress in the IC chip  52  due to deformation of the substrate  26  is relaxed, compared to a case where the stress relaxing member  28 H is provided at a position corresponding to a part of the outer peripheral portion of the IC chip  52 . 
     In the third modification example, although a form example where the stress relaxing member  28 H is formed in a continuous quadrangular frame shape has been described, the technique of the present disclosure is not limited thereto. For example, the stress relaxing member  28 H may have a discontinuous quadrangular frame shape. 
     In the above-described embodiment, although a form example where the stress relaxing member  28  has a quadrangular shape has been described, the technique of the present disclosure is not limited thereto. For example, the stress relaxing member  28  may have a quadrangular shape in which a corner portion is chamfered or may have a polygonal shape, a circular shape, or an annular shape other than the quadrangle in plan view. 
     In the above-described embodiment, although a form example where copper foil is employed as the coil  60  has been described, the technique of the present disclosure is not limited thereto. For example, other kinds of conductive materials, such as aluminum foil, may be used as the coil  60 . In this case, other kinds of conductive materials, such as aluminum foil, that form the coil  60  are employed as the stress relaxing member  28 . 
     The content of the above description and the content of the drawings are detailed description of portions according to the technique of the present disclosure, and are merely examples of the technique of the present disclosure. For example, the above description relating to configuration, function, operation, and advantageous effects is description relating to an example of configuration, function, operation, and advantageous effects of the portions according to the technique of the present disclosure. Thus, it is needless to say that unnecessary portions may be deleted, new elements may be added, or replacement may be made to the content of the above description and the content of the drawings without departing from the gist of the technique of the present disclosure. Furthermore, to avoid confusion and to facilitate understanding of the portions according to the technique of the present disclosure, description relating to common technical knowledge and the like that does not require particular description to enable implementation of the technique of the present disclosure is omitted from the content of the above description and the content of the drawings. 
     In the specification, “A and/or B” is synonymous with “at least one of A or B”. That is, “A and/or B” may refer to A alone, B alone, or a combination of A and B. Furthermore, in the specification, a similar concept to “A and/or B” applies to a case in which three or more matters are expressed by linking the matters with “and/or”. 
     All cited documents, patent applications, and technical standards described in the specification are incorporated by reference in the specification to the same extent as in a case where each individual cited document, patent application, or technical standard is specifically and individually indicated to be incorporated by reference.