US20080283619A1 - Ic card - Google Patents
Ic card Download PDFInfo
- Publication number
- US20080283619A1 US20080283619A1 US12/182,070 US18207008A US2008283619A1 US 20080283619 A1 US20080283619 A1 US 20080283619A1 US 18207008 A US18207008 A US 18207008A US 2008283619 A1 US2008283619 A1 US 2008283619A1
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- US
- United States
- Prior art keywords
- recess
- cap
- card
- memory card
- memory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
- G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
- G06K13/08—Feeding or discharging cards
- G06K13/0806—Feeding or discharging cards using an arrangement for ejection of an inserted card
- G06K13/0825—Feeding or discharging cards using an arrangement for ejection of an inserted card the ejection arrangement being of the push-push kind
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
- H01L2924/1815—Shape
Definitions
- the present invention relates to IC (integrated circuit) card technology, and technology effectively applied to, e.g., semiconductor memory card (hereinafter referred to as a memory card).
- IC integrated circuit
- Memory cards such as multimedia cards (standardized by the multimedia organization), SD memory cards (standardized by the SD card organization) or memory sticks (registered trademark of Sony Corp.) are a kind of storage devices to store information in their internal semiconductor memory chips. Since access can be made directly and electrically to nonvolatile memories of semiconductor memory chips without mechanical control, the memory cards have the excellent advantages of faster write and read speeds and easier replacement of storage media in comparison with other storage devices. Since the memory cards are compact in size and light in weight, they are primarily used as auxiliary storage devices of portable electronic devices such as portable personal computers, cellular phones, or digital cameras.
- the appearance of a multimedia card is formed by a square-planar thin-plate cap having a corner largely chamfered.
- a memory body is fitted in and bonded to a recess on a parts mounting surface of the cap.
- the memory body includes a wiring board and semiconductor chips mounted on its principal surface.
- the semiconductor chips are sealed by a sealing part and are electrically connected with plural external terminals on the back surface of the wiring board through wiring of the wiring board.
- the plural external terminals on the back surface of the wiring board are exposed to the outside to be electrically connected with an electronic device in which the multimedia card is to be incorporated.
- the appearance of the above-mentioned SD card is formed by bonding together two square-planar thin-plate cases each having a corner largely chamfered.
- a memory body is sandwiched between the two cases.
- Plural openings are formed on the bask surface of one case of the SD card, and plural external terminals of the memory body are exposed from the openings. Through the openings of the case, the external terminals of the SD card and an electronic device in which the SD card is to be incorporated are electrically connected.
- the appearance of the above-mentioned memory stick is a rectangular thin plate having a corner largely chamfered.
- a memory body is sandwiched between two cases.
- sides of the two cases are provided with recesses penetrating from the principal surface to the back surface of the two cases, and the recesses are engaged with retainers of an electronic device.
- This construction prevents an SD card from being forcibly removed or from popping out readily due to slight impact (see Patent Documents 1, 2, and 3).
- a recess for fixing the memory stick in a desired position is provided at an edge of a case side at which external terminals of the case are exposed (see Patent Document 4).
- memory cards such as multimedia cards whose appearance is formed by one cap are thinner and mechanically weaker than SD cards and memory sticks. Providing a recess without sufficient care would reduce mechanical strength and damage the card. Therefore, there is a problem in that it is impossible to provide even a small recess without sufficient care.
- An object of the present invention is to provide technology that prevents an IC card from falling off readily an electronic device while maintaining the mechanical strength of the IC card.
- a recess having a depth of a third to two thirds of the thickness of the cap from a principal surface of the cap is provided at a side of the cap.
- An IC card can be prevented from falling off readily an electronic device while maintaining the mechanical strength of the IC card.
- FIG. 1 is an overall perspective view of an IC card of one embodiment of the present invention when viewed from a principal surface thereof;
- FIG. 2 is an overall perspective view of the IC card of FIG. 1 when viewed from a back surface thereof;
- FIG. 3 is an overall plan view of the principal surface of the IC card of FIG. 1 ;
- FIG. 4 is an overall plan view of the back surface of the IC card of FIG. 1 ;
- FIG. 5 is a sectional view along the line Y 1 -Y 1 of FIG. 4 ;
- FIG. 6 is an overall plan view of a body of the IC card of FIG. 1 ;
- FIG. 7 is a sectional view along the line X 1 -X 1 of FIG. 6 ;
- FIG. 8 is an overall plan view of the IC card of FIG. 1 when a sealing part of the principal surface of the IC card body is removed;
- FIG. 9 is an overall plan view showing an example of an array of different terminals on the back surface of the body of the IC card of FIG. 1 ;
- FIG. 10 is a drawing for explaining the IC card of FIG. 1 before being attached to a connector
- FIG. 11 is a drawing for explaining the IC card of FIG. 10 when viewed from a right side thereof;
- FIG. 12 is a drawing for explaining the IC card of FIG. 1 after being attached to the connector;
- FIG. 13 is a drawing for explaining the IC card of FIG. 12 when viewed from a right side thereof;
- FIG. 14 is a perspective view showing major parts of the cap when the recess of the IC card of FIG. 1 is viewed from the principal surface of the cap;
- FIG. 15 is a perspective view showing major parts of the cap when the recess of the IC card of FIG. 1 is viewed from the back surface of the cap;
- FIG. 16 which is shown for comparison, is a perspective view showing major parts of the cap on the principal surface when the recess for preventing the IC card from falling off penetrates from the principal surface to the back surface of the cap;
- FIG. 17 which is shown for comparison, is a perspective view showing major parts of the cap on the back surface when the recess for preventing the IC card from falling off penetrates from the principal surface to the back surface of the cap;
- FIG. 18 is a side view showing major parts of the cap of the IC card of FIG. 1 ;
- FIG. 19 is a drawing for explaining the depth of the recess of FIG. 18 ;
- FIG. 20 is a drawing for explaining the depth of the recess of FIG. 18 ;
- FIG. 21 is a drawing schematically showing glass-reinforced fibers on the side of the cap of the IC card
- FIG. 22 is a drawing schematically showing glass-reinforced fibers on the side of the cap of the IC card of FIG. 1 ;
- FIG. 23 is a drawing schematically showing glass-reinforced fibers on the back surface of the cap of the IC card of FIG. 1 ;
- FIG. 24 is an overall plan view of the back surface of the cap of the IC card of FIG. 1 ;
- FIG. 25 is an overall plan view of the back surface of the cap of the IC card of FIG. 1 ;
- FIG. 26 is a sectional view along the line X 2 -X 2 of FIG. 25 for explaining a defect in forming a recess for preventing an IC card from falling off;
- FIG. 27 is a perspective view showing major parts of the recess of the cap of FIG. 26 ;
- FIG. 28 is a sectional view taken along the line X 2 -X 2 of FIG. 25 of the cap of the IC card of FIG. 1 ;
- FIG. 29 is a drawing showing a side of the IC card of FIG. 1 when attached to the connector;
- FIG. 30 is a drawing for explaining a defect in forming a recess for preventing an IC card from falling off, on a back surface of the cap;
- FIG. 31 is a plan view of the principal side of the IC card of FIG. 1 when an adapter is attached to the IC card;
- FIG. 32 is a side view of the IC card of FIG. 31 ;
- FIG. 33 is a plan view of the back surface of the IC card of FIG. 31 ;
- FIG. 34 is an overall plan view of the principal surface of an IC card of another embodiment of the present invention.
- FIG. 35 is an overall plan view of the back surface of the IC card of FIG. 34 ;
- FIG. 36 is a sectional view taken along the line Y 2 -Y 2 of FIG. 35 ;
- FIG. 37 is a plan view showing major parts of a board frame in the process of assembling IC cards of an embodiment of the present invention.
- FIG. 38 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent to FIG. 37 ;
- FIG. 39 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent to FIG. 38 ;
- FIG. 40 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent to FIG. 39 ;
- FIG. 41 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent to FIG. 40 ;
- FIG. 1 is an overall perspective view of a memory card (IC card) 1 A of the present embodiment when viewed from a principal surface thereof.
- FIG. 2 is an overall perspective view of the memory card 1 A of FIG. 1 when viewed from a back surface thereof.
- FIG. 3 is an overall plan view of the principal surface of the memory card 1 A of FIG. 1 .
- FIG. 4 is an overall plan view of the back surface of the memory card 1 A of FIG. 1 .
- FIG. 5 is a sectional view along the line Y 1 -Y 1 of FIG. 4 .
- FIG. 6 is an overall plan view of a memory body of the memory card 1 A.
- FIG. 7 is a sectional view along the line X 1 -X 1 of FIG. 6 .
- FIG. 8 is an overall plan view of the memory card when a sealing part of the principal surface of the memory body is removed.
- FIG. 9 is an overall plan view showing an example of an array of different terminals on the back surface of the memory body.
- the arrow of FIGS. 1 and 3 indicate the direction in which the memory card 1 A is inserted into an electronic device.
- the memory card 1 A of the first embodiment can be used as an auxiliary storage unit of various portable electronic devices including information processing units such as portable computers, image processing units such as digital cameras, or communication devices such as cellular phones.
- the memory card 1 A is formed from a plane rectangular, small thin plate having a chamfered part. Its contour dimensions are about 24 mm in width (second length) W 1 , about 18 mm in length (first length) L 1 , and about 1.4 mm in depth D 1 .
- the memory card 1 A has the same contour specifications and functions as multimedia cards (hereinafter simply referred to as RSMMC) of so-called reduced size.
- RSMMC multimedia cards
- the contour size allows the memory card to be used as, e.g., small-size electronic devices such as cellular phones and digital cameras.
- FSMMC full-size MMC
- auxiliary instrument auxiliary instrument
- a sheet metal cap 2 forming the appearance of the memory card 1 A is formed of an insulating resin such as ABS resin and PPE (Poly Phenylen Ether) in terms of weight reduction, machinability, and flexibility.
- an insulating resin such as ABS resin and PPE (Poly Phenylen Ether) in terms of weight reduction, machinability, and flexibility.
- PPE Poly Phenylen Ether
- a glass-reinforced fiber having higher tensile strength per sectional area than the above-mentioned insulating resin forming the cap 2 is mixed into the resin.
- a chamfered part 2 a at one corner at the front side of the cap 2 is used for index.
- a small recess (second recess) 2 b formed on a short side of the cap 2 on the side of the chamfered part 2 a is provided to realize a latch mechanism for holding the memory card 1 A in an electronic device to prevent the memory card 1 A incorporated in the electronic device from being forcibly extracted, or prevent the memory card 1 A from popping out when the electronic device is dropped.
- the length L 2 of the recess 2 b is about 1.5 ⁇ 0.1 mm, and the length L 3 is about 0.55 ⁇ 0.1 mm.
- the recess 2 b when viewed from a side thereof, is formed to terminate in the middle of thickness of the cap 2 from the principal surface (first surface), so that its depth is about 0.65 ⁇ 0.1 mm.
- the recess 2 b can be provided at plural locations, when too many recesses 2 b were provided, the mechanical strength of the cap 2 would decrease. Therefore, in the first embodiment, the recess 2 b is provided only at the side of one side of the memory card 1 A. Thereby, the mechanical strength of the cap 2 can be maintained.
- the length L 1 of the memory card 1 A in the direction of the arrow A is shorter than the width W 1 orthogonal to it, and the length of a card guide of a connector to which the memory card 1 A is attached becomes short, when a connector for pressing the sides of the memory card 1 A is used, the memory card 1 A is liable to disconnect from the connector due to rotary deviation (rotation direction within a surface parallel to the principal surface of the memory card 1 A). Accordingly, in that case, the recess 2 b may be provided at each of sides opposite to each other of the cap 2 . Since rotary deviation can be prevented by this construction, the ability to prevent the memory card 1 A from falling off can be increased. The recess 2 b will be described in detail later.
- Adapter attaching parts 2 c having a convex cross section at both corners at the back of the cap 2 are fitted into recesses of the adapter for converting RSMMC into FSMMC.
- An adapter claw attaching part 2 d at the center in a longitudinal direction in the vicinity of the back of the back surface of the cap 2 is engaged with a claw of the adapter.
- a plane triangular mark 2 e at the front side of the principal surface of the cap 2 indicates the direction in which the memory card 1 A is inserted into a desired electronic device.
- An indentation 2 f is used to stick a seal capable of describing various information (classification of the memory card 1 A, etc.).
- a groove 2 g is a groove for removing the card.
- a recess 2 h (first recess) is formed on the back surface of the cap 2 (second surface, part housing surface).
- the recess 2 h is formed in stepped form with a shallow recess 2 h 1 and a deep recess 2 h 2 .
- a frame part 2 i is formed so as not to compromise its continuity along the direction of the outer circumference.
- the mechanical strength of the thin cap 2 is maintained.
- Both corners of the recess 2 h at the back of the cap 2 are chamfered and the width of the frame part 2 i 1 in those portions is expanded to enhance the mechanical strength of the cap 2 .
- a memory body 3 (electronic part body) is fitted in and bonded to or placed into tight contact with the recess 2 h .
- the memory body 3 includes a wiring board 3 a , semiconductor chips (hereinafter simply referred to as chips) 3 b ( 3 b 1 , 3 b 2 ) mounted on a principal surface of the wiring board 3 a , and a sealing part 3 c for sealing the chips 3 b .
- the wiring board 3 a of the memory body 3 has a wiring structure in which one or plural metal wiring layers (wiring) are formed in an insulator such as resins of a glass epoxy system.
- the wiring for the principal surface of the wiring board 3 a is electrically connected with external terminals 3 d of the back surface of the wiring board 3 a via through holes.
- external terminals 3 d are arrayed along the longitudinal direction of the wiring board 3 a .
- seven external terminals may be arrayed in a row along the longitudinal direction of the wiring board 3 a .
- the plane contour of the wiring board 3 a is formed to be rectangular, and its three corners are chamfered.
- a flash memory Electrically Erasable Programmable Read Only Memory
- EEPROM Electrically Erasable Programmable Read Only Memory
- plural memory chips 3 b 1 may be arrayed on the principal surface of the wiring board 3 a to obtain a desired memory capacity in total.
- the chips may be stacked in layers to obtain a desired memory capacity in total. When the chips are stacked in layers, a large capacity can be obtained on a small occupation area.
- the chip 3 b 1 is disposed at a position distant from the chamfered part for index. In the vicinity of one side of a principal surface of the memory chip 3 b 1 , plural pointing pads (hereinafter referred to as pads) PD 1 are disposed along the side.
- the pads PD 1 are electrically connected with the wiring of the principal surface of the wiring board 3 a through bonding wires WR 1 .
- the bonding wires WR 1 are formed of metallic thin wires such as gold (Au).
- a controller is formed which controls the operation of a flash memory circuit of the chip 3 b 1 .
- the chip 3 b 2 is disposed near the chamfered part for index.
- the pads PD 2 are electrically connected with the wiring of the principal surface of the wiring board 3 a through bonding wires WR 2 .
- the chips 3 b 1 and 3 b 2 , the bonding wires WR 1 and WR 2 , and most of the principal surface of the wiring board 3 a are covered by the sealing part 3 c made of resin and the like of epoxy system.
- the sealing part 3 c is housed in the deep recess 2 h 2 side of the cap 2 , and an outer circumferential portion of the principal surface of the wiring board 3 a exposed from the sealing part 3 c contacts the upper surface of a stepped portion of the shallow recess 2 h 1 of the cap 2 and is bonded by an adhesive.
- FIG. 10 shows the memory card 1 A before being attached to the connector 5 .
- FIG. 11 shows the memory card 1 A of FIG. 10 when viewed from a right side thereof.
- FIG. 12 shows the memory card 1 A after being attached to the connector 5 .
- FIG. 13 is a right side view of FIG. 12 .
- the tip of the lock claw 5 a of the connector 5 enters the recess 2 b at a side of the memory card 1 A.
- a coil spring 5 b is attached to another end of the lock claw 5 a , and the lock claw 5 a is urged in the direction of the side of the memory card 1 A. This prevents the memory card 1 A from falling off the connector 5 . That is, since the memory card 1 A can be firmly supported by the lock claw 5 a of the connector 5 by providing the memory card 1 A with the recess 2 b , the memory card 1 A can be prevented from falling off the connector 5 .
- the tips of 13 metallic contact pins 5 d attached to a connector body 5 c contact the external terminals 3 d of the memory card 1 A.
- the contact pins 5 d are formed in the shape of flat springs, and their tips are urged to the back surface of the memory card 1 . Thereby, the tips of the contact pins 5 d tightly contact the external terminals 3 d .
- An metallic upper shell 5 e of the connector 5 is provided with an elastic claw integrated with it, and by the elasticity claw, the memory card 1 A is urged in a direction indicated by the arrow B of FIG. 13 .
- a slider 5 f of connector 5 is slid in the direction of the arrow A by the memory card 1 A and the memory card 1 A is locked.
- a method of ejecting the memory card 1 A e.g., a push-push system is adopted. Specifically, when the back of the memory card 1 A inserted into the connector 5 is lightly pushed in the direction of the arrow A, the memory card 1 A is unlocked and lightly pops out backward by an urging force of a coil spring 5 g , so that the memory card 1 A can be easily removed from the connector 5 .
- FIG. 14 is a perspective view showing major parts of the cap 2 when the recess 2 b of the memory card 1 A is viewed from the principal surface of the cap 2 .
- FIG. 15 is a perspective view showing major parts of the cap 2 when the recess 2 b of the memory card 1 A is viewed from the back surface of the cap 2 .
- FIGS. 16 and 17 which are shown for comparison, are perspective views showing major parts of the cap 2 on the principal surface and the back surface when the recesses 50 for preventing the memory card from falling off penetrate from the principal surface to the back surface of the cap 2 .
- the recess 2 b does not penetrate from the principal surface to the back surface of the cap 2 , a resin part of cap 2 is left at the bottom of the recess 2 b , and the continuity of the frame part 2 i of the back surface of the cap 2 is maintained. Thereby, the mechanical strength of the cap 2 can be maintained.
- the frame part 2 i of the back surface of the cap 2 maintaining the mechanical strength of the thin cap 2 becomes thin partially and its continuity is compromised, with the result that the mechanical strength of the cap 2 decreases.
- the recess 2 b since a resin part of the cap 2 is left at the bottom of the recess 2 b , and the recess 2 b does not compromise the continuity of the frame part 2 i of the back surface of the cap 2 so that the continuity of the frame part 21 is maintained.
- the mechanical strength of the cap 2 can be maintained even when the recess 2 b for falling-off prevention is provided in the thin cap 2 .
- the recess 2 b is formed on the principal surface of the cap 2 and does not penetrate from the principal surface to the back surface of the cap 2 . Therefore, according to the first embodiment, the memory card 1 A can be prevented from moving in a memory card 1 A attaching/detaching direction indicated by the arrow C of the memory card 1 A, and also from moving in the thickness direction of the memory card 1 A indicated by the arrow E. Specifically, since the memory card 1 A inserted into the connector 5 is thin, it may shake in the direction of the arrow E because of external shocks. As shown in FIGS.
- a resin part of the cap 2 is left at the bottom of the recess 2 b and there can be provided a part to prevent the memory card 1 A from moving in the direction of the arrow E.
- the memory card 1 A in the connector 5 can be prevented from shaking in the direction of the arrow E, and a momentary poor connection between the external terminals 3 d of the memory card 1 A and the contact pins 5 d of the connector 5 can be prevented. Since a mechanical part for falling-off prevention of the memory card 1 A also serves as a mechanism for preventing the memory card 1 A from shaking, new parts and mechanisms do not need to be added. Therefore, the memory card of this embodiment will neither cause an increase in costs of the connector 5 nor hamper the trend to make the connector 5 more compact and lighter in weight.
- FIG. 18 is a side view showing major parts of the cap 2 .
- FIGS. 19 and 20 respectively show the depth of the recess 2 b .
- the depth D 2 of the recess 2 b is about a third to two thirds of the thickness D 1 of the cap 2 , preferably about two fifths to three fifths, more preferably half the thickness of the cap 2 .
- Half the thickness of the cap 2 referred to here is not only the actual half 0.7 mm but also includes a range of error. That is, when a range of error is e.g., ⁇ 10.1 mm, half the thickness of the cap 2 referred to here is 0.6 to 0.8 mm. The reason for this is that, as shown in FIGS.
- FIG. 21 schematically shows glass-reinforced fibers 8 on the side of the cap 2 .
- the depths of the recess 2 b is designed so as not to heavily disorder the orientation of the glass-reinforced fiber 8 contained in the cap 2 .
- the glass-reinforced fibers 8 contained under the recess 2 b of the cap 2 especially the frame part 2 i
- more glass-reinforced fibers 8 are oriented along the longitudinal direction of the frame part 2 i than along other directions.
- the mechanical strength of the frame part 2 i of the cap 2 can be enhanced, and the mechanical strength of the cap 2 (rigidity to bending and twisting) can be enhanced.
- the depth of the recess 2 b has only to be set so that a resin having a thickness of 0.15 mm or longer, preferably 0.2 mm or longer, is left at the bottom of the recess 2 b.
- FIGS. 24 and 25 show overall plan views of the back surface of the cap 2 .
- the recess 2 b is formed so that its depth length L 3 is smaller than the width w 2 of the frame part 2 i .
- the width W 2 of the frame part 2 i is about 0.6 ⁇ 0.1 mm, for example.
- the depth length L 3 of the recess 2 b must be about 0.5 to 0.6 mm to maintain the ability to prevent the memory card 1 A from falling off.
- the depth length L 3 of the recess 2 b becomes greater than the width W 3 of the frame part 2 i , and part of the recess 2 b overlaps an area of the recess 2 h .
- the recess 2 b is thus made too deep on the condition that depth length L 3 >width W 3 , as shown in FIGS. 26 and 27 , the recess 2 b will penetrate the recess 2 h , and a part (a coating side of an adhesive) of the principal surface (chip mounting surface) of the wiring board 3 a will be exposed.
- the depth length L 3 of the recess 2 b should be preferably long to enhance the ability to prevent the memory card 1 A from falling off.
- FIG. 26 is a sectional view along the line X 2 -X 2 of FIG. 25 .
- FIG. 27 is a perspective view showing major parts of the recess 2 b of the cap 2 of FIG. 26 .
- the depth D 2 of the recess 2 b is set so that the recess 2 b does not penetrate the recess 2 h .
- the recess 2 h is provided with the shallow recess 2 h 1 and the deep recess 2 h 2 , and the recess 2 b overlaps an area of the shallow recess 2 h 1 to secure a resin thickness between the recess 2 b and the deep recess 2 h 2 . This prevents the recess 2 b from penetrating the recess 2 h at its bottom and side.
- the shallow recess 2 h 1 whose depth D 3 is about 0.4 mm, is used to house the wiring board 3 a of the memory body 3 .
- the deep recess 2 h 2 whose depth D 4 is about 1 mm, is used to house the sealing part 3 c of the memory body 3 .
- FIG. 29 shows a side of the memory card 1 A when attached to or detached from the connector 5 .
- FIG. 30 enlargedly shows a contact portion between the cap 2 and a guide part when the recess 2 b exists on the back surface of the cap 2 of the memory card 1 A.
- the recess 2 b since the short sides of the card compel the whole area of the back surface at the sides to be used as the guide part of the card, when the recess 2 b is provided on the back surface of the cap 2 , the recess 2 b will contact the guide part 5 h of the connector 5 without fail.
- the recess 2 b by providing the recess 2 b on the principal surface of the cap 2 , since the smoothness of the back surface of the cap 2 is maintained, damages due to contact between the cap 2 and the guide part 5 h when the memory card 1 A is attached or detached can be reduced. Therefore, the life of the memory card 1 A and the connector 5 can be extended.
- FIG. 31 is a plan view of the principal side of the memory card 1 A when an adapter 9 is attached to the memory card 1 A (RSMMC).
- FIG. 32 is a side view of the memory card 1 A of FIG. 31 .
- FIG. 33 is a plan view of the back surface of the memory card 1 A of FIG. 31 .
- RSMMC can be converted into FSMMC, that is, FSMMC size (e.g., 32 mm ⁇ 24 mm ⁇ 1.4 mm).
- FSMMC size e.g., 32 mm ⁇ 24 mm ⁇ 1.4 mm.
- the recess 2 b for falling-off prevention is exposed at one side of the principal surface of the converted memory card 1 A, and the converted memory card 1 A can also be prevented from falling off and popping out of an electronic device.
- FIG. 34 is an overall plan view of the principal surface of a memory card 1 B of the second embodiment.
- FIG. 35 is an overall plan view of the back surface of the memory card 1 B of FIG. 34 .
- FIG. 36 is a sectional view taken along the line Y 2 -Y 2 of FIG. 35 .
- the cap 2 of the memory card 1 B of the second embodiment is larger in its plane size than the cap 2 of the memory card 1 A of the first embodiment, and is, for example, about 32 mm in length L 4 , about 24 mm in width W 1 , and 1.4 mm in depth D 1 .
- the cap 2 of the memory card 1 B does not require a part for attaching an adapter for size conversion. In other points, the memory card 1 B is the same as the memory card of the first embodiment.
- the memory card 1 B of the second embodiment also has the recess 2 b formed at the side of one side of the principal surface of the cap 2 as in the first embodiment. This construction enables the memory card 1 B to be prevented from falling off and popping out of an electronic device.
- FIGS. 37 to 41 are plan views of the principal surface of a board frame 10 in the process of assembling the memory cards.
- the strap-like board frame 10 is provided.
- plural wiring boards 3 a are connected to the center of two short sides thereof.
- the frame members 10 a, the coupling parts 10 b, and the wiring boards 3 a are integrally formed.
- the three corners of the wiring board 3 a are chamfered.
- the chips 3 b 1 and 3 b 2 of the each wiring board 3 a of the board frame 10 , and the bonding wires WR 1 and WR 2 , and the like are collectively sealed by the transfer molding method, and a sealing part 3 c is formed on the each wiring board 3 a .
- the wiring boards 3 a are separated from the board frame 10 to manufacture the memory body 3 .
- the memory body 3 is fitted in the recess 2 h of the cap 2 shown by FIGS. 1 to 5 of the first embodiment and fixed by an adhesive.
- the memory card 1 A of the first embodiment is manufactured.
- the memory body 3 is fitted in the recess 2 h of the cap 2 shown by FIGS. 34 to 36 of the second embodiment and fixed by an adhesive.
- the memory card 1 B of the second embodiment is manufactured.
- connection method using bump electrodes can be adopted.
- EEPROM electrically erasable programmable read-only memory
- the present invention is not limited to such a memory card; it can also apply to a memory card incorporating another memory circuit such as SRAM (Static Random Access Memory), FRAM (Ferroelectric Random Access Memory), or MRAM (Magnetic Random Access Memory). Also, it can apply to an IC (integrated circuit) card having no memory circuit.
- the present invention can apply to the IC card industry.
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Abstract
An IC card is prevented from falling off readily an electronic device while maintaining the mechanical strength of the IC card. A recess for preventing a memory card from falling off an electronic device is provided at the side of one side of a principal surface of a cap of the memory card which is configured by fitting a memory body in a recess formed on a parts mounting surface of the cap. The bottom of the recess is terminated in the middle of the thickness of the cap. This construction makes it possible to prevent the memory card from falling off readily an electronic device while maintaining the mechanical strength of the memory card.
Description
- The present application claims priority from Japanese patent application No 2003-359824 filed on Oct. 20, 2003, the content of which is hereby incorporated by reference into this application.
- The present invention relates to IC (integrated circuit) card technology, and technology effectively applied to, e.g., semiconductor memory card (hereinafter referred to as a memory card).
- Memory cards such as multimedia cards (standardized by the multimedia organization), SD memory cards (standardized by the SD card organization) or memory sticks (registered trademark of Sony Corp.) are a kind of storage devices to store information in their internal semiconductor memory chips. Since access can be made directly and electrically to nonvolatile memories of semiconductor memory chips without mechanical control, the memory cards have the excellent advantages of faster write and read speeds and easier replacement of storage media in comparison with other storage devices. Since the memory cards are compact in size and light in weight, they are primarily used as auxiliary storage devices of portable electronic devices such as portable personal computers, cellular phones, or digital cameras.
- The appearance of a multimedia card is formed by a square-planar thin-plate cap having a corner largely chamfered. A memory body is fitted in and bonded to a recess on a parts mounting surface of the cap. The memory body includes a wiring board and semiconductor chips mounted on its principal surface. The semiconductor chips are sealed by a sealing part and are electrically connected with plural external terminals on the back surface of the wiring board through wiring of the wiring board. The plural external terminals on the back surface of the wiring board are exposed to the outside to be electrically connected with an electronic device in which the multimedia card is to be incorporated. The appearance of the above-mentioned SD card is formed by bonding together two square-planar thin-plate cases each having a corner largely chamfered. A memory body is sandwiched between the two cases. Plural openings are formed on the bask surface of one case of the SD card, and plural external terminals of the memory body are exposed from the openings. Through the openings of the case, the external terminals of the SD card and an electronic device in which the SD card is to be incorporated are electrically connected. The appearance of the above-mentioned memory stick is a rectangular thin plate having a corner largely chamfered. Like the SD card, a memory body is sandwiched between two cases.
- By the way, in conventional multimedia cards, sufficient measures have not been taken against action of forcibly extracting the multimedia cards inserted into electronic devices and against cases where the multimedia cards pop out when the electronic devices drop. However, since the multimedia cards have often been used in electronic devices such as cellular phones and mobile computers, more and more electronic devices have had a slot structure so that the multimedia cards can be easily removed, for convenience of users' use. As a result, there has been an increase in action of forcibly extracting the multimedia cards and cases where the multimedia cards pop out readily when the electronic devices drop, and therefore it has become important to take appropriate measures against such situations.
- In the above-mentioned SD card, sides of the two cases are provided with recesses penetrating from the principal surface to the back surface of the two cases, and the recesses are engaged with retainers of an electronic device. This construction prevents an SD card from being forcibly removed or from popping out readily due to slight impact (see
Patent Documents - In the above-mentioned memory stick, a recess for fixing the memory stick in a desired position is provided at an edge of a case side at which external terminals of the case are exposed (see Patent Document 4).
- [Patent document 1] Japanese Unexamined Patent Publication No. 2003-6576
- [Patent document 2] Japanese Unexamined Patent Publication No. 2003-86293
- [Patent document 3] Japanese Unexamined Patent Publication No. 2003-86296
- [Patent document 4] Japanese Unexamined Patent Publication No. 2003-91700
- However, memory cards such as multimedia cards whose appearance is formed by one cap are thinner and mechanically weaker than SD cards and memory sticks. Providing a recess without sufficient care would reduce mechanical strength and damage the card. Therefore, there is a problem in that it is impossible to provide even a small recess without sufficient care.
- An object of the present invention is to provide technology that prevents an IC card from falling off readily an electronic device while maintaining the mechanical strength of the IC card.
- The above-mentioned and other objects and novel characteristics of the present invention will become apparent from the description of this specification and the accompanying drawings.
- The typical disclosures of the invention will be summarized in brief as follows.
- Specifically, according to the present invention, in an IC card whose electronic part body is fitted in and bonded to or placed into tight contact with a recess on a parts mounting surface of a cap, a recess having a depth of a third to two thirds of the thickness of the cap from a principal surface of the cap is provided at a side of the cap.
- Effects obtained by typical disclosures of the invention will be described in brief as follows.
- An IC card can be prevented from falling off readily an electronic device while maintaining the mechanical strength of the IC card.
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FIG. 1 is an overall perspective view of an IC card of one embodiment of the present invention when viewed from a principal surface thereof; -
FIG. 2 is an overall perspective view of the IC card ofFIG. 1 when viewed from a back surface thereof; -
FIG. 3 is an overall plan view of the principal surface of the IC card ofFIG. 1 ; -
FIG. 4 is an overall plan view of the back surface of the IC card ofFIG. 1 ; -
FIG. 5 is a sectional view along the line Y1-Y1 of FIG. 4; -
FIG. 6 is an overall plan view of a body of the IC card ofFIG. 1 ; -
FIG. 7 is a sectional view along the line X1-X1 ofFIG. 6 ; -
FIG. 8 is an overall plan view of the IC card ofFIG. 1 when a sealing part of the principal surface of the IC card body is removed; -
FIG. 9 is an overall plan view showing an example of an array of different terminals on the back surface of the body of the IC card ofFIG. 1 ; -
FIG. 10 is a drawing for explaining the IC card ofFIG. 1 before being attached to a connector; -
FIG. 11 is a drawing for explaining the IC card ofFIG. 10 when viewed from a right side thereof; -
FIG. 12 is a drawing for explaining the IC card ofFIG. 1 after being attached to the connector; -
FIG. 13 is a drawing for explaining the IC card ofFIG. 12 when viewed from a right side thereof; -
FIG. 14 is a perspective view showing major parts of the cap when the recess of the IC card ofFIG. 1 is viewed from the principal surface of the cap; -
FIG. 15 is a perspective view showing major parts of the cap when the recess of the IC card ofFIG. 1 is viewed from the back surface of the cap; -
FIG. 16 , which is shown for comparison, is a perspective view showing major parts of the cap on the principal surface when the recess for preventing the IC card from falling off penetrates from the principal surface to the back surface of the cap; -
FIG. 17 , which is shown for comparison, is a perspective view showing major parts of the cap on the back surface when the recess for preventing the IC card from falling off penetrates from the principal surface to the back surface of the cap; -
FIG. 18 is a side view showing major parts of the cap of the IC card ofFIG. 1 ; -
FIG. 19 is a drawing for explaining the depth of the recess ofFIG. 18 ; -
FIG. 20 is a drawing for explaining the depth of the recess ofFIG. 18 ; -
FIG. 21 is a drawing schematically showing glass-reinforced fibers on the side of the cap of the IC card; -
FIG. 22 is a drawing schematically showing glass-reinforced fibers on the side of the cap of the IC card ofFIG. 1 ; -
FIG. 23 is a drawing schematically showing glass-reinforced fibers on the back surface of the cap of the IC card ofFIG. 1 ; -
FIG. 24 is an overall plan view of the back surface of the cap of the IC card ofFIG. 1 ; -
FIG. 25 is an overall plan view of the back surface of the cap of the IC card ofFIG. 1 ; -
FIG. 26 is a sectional view along the line X2-X2 ofFIG. 25 for explaining a defect in forming a recess for preventing an IC card from falling off; -
FIG. 27 is a perspective view showing major parts of the recess of the cap ofFIG. 26 ; -
FIG. 28 is a sectional view taken along the line X2-X2 ofFIG. 25 of the cap of the IC card ofFIG. 1 ; -
FIG. 29 is a drawing showing a side of the IC card ofFIG. 1 when attached to the connector; -
FIG. 30 is a drawing for explaining a defect in forming a recess for preventing an IC card from falling off, on a back surface of the cap; -
FIG. 31 is a plan view of the principal side of the IC card ofFIG. 1 when an adapter is attached to the IC card; -
FIG. 32 is a side view of the IC card ofFIG. 31 ; -
FIG. 33 is a plan view of the back surface of the IC card ofFIG. 31 ; -
FIG. 34 is an overall plan view of the principal surface of an IC card of another embodiment of the present invention; -
FIG. 35 is an overall plan view of the back surface of the IC card ofFIG. 34 ; -
FIG. 36 is a sectional view taken along the line Y2-Y2 ofFIG. 35 ; -
FIG. 37 is a plan view showing major parts of a board frame in the process of assembling IC cards of an embodiment of the present invention; -
FIG. 38 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent toFIG. 37 ; -
FIG. 39 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent toFIG. 38 ; -
FIG. 40 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent toFIG. 39 ; -
FIG. 41 is a plan view showing major parts of the board frame in the process of assembling IC cards subsequent toFIG. 40 ; - In embodiments below, descriptions will be made separately to plural sections or embodiments when required. Unless otherwise stated, they are not independent of each other, and one is dependent partially or wholly on others in terms of variants, details, additional descriptions, and the like. In the embodiments below, the number of elements (including count, numeric value, quantity, and range), when designated, are not limited to the designated number and may be around the designated number, except in cases where it is explicitly specified and cases where it is theoretically limited to the specific number. Furthermore, in the embodiments below, it goes without saying that components in the embodiments (including element steps and the like) are not always mandatory, except in cases where they are explicitly specified. Likewise, in the embodiments below, shapes, positional relations, and the like of components and the like, when designated, include similarities to the designated those, except in cases where they are explicitly specified and cases where the similarities are theoretically inappropriate. The same is also true for the above-mentioned numeric values and range. In all drawings for explaining the embodiments, elements having identical functions are identified by the same reference numerals and duplicate descriptions of them are omitted. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
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FIG. 1 is an overall perspective view of a memory card (IC card) 1A of the present embodiment when viewed from a principal surface thereof.FIG. 2 is an overall perspective view of thememory card 1A ofFIG. 1 when viewed from a back surface thereof.FIG. 3 is an overall plan view of the principal surface of thememory card 1A ofFIG. 1 .FIG. 4 is an overall plan view of the back surface of thememory card 1A ofFIG. 1 .FIG. 5 is a sectional view along the line Y1-Y1 ofFIG. 4 .FIG. 6 is an overall plan view of a memory body of thememory card 1A.FIG. 7 is a sectional view along the line X1-X1 ofFIG. 6 .FIG. 8 is an overall plan view of the memory card when a sealing part of the principal surface of the memory body is removed.FIG. 9 is an overall plan view showing an example of an array of different terminals on the back surface of the memory body. The arrow ofFIGS. 1 and 3 indicate the direction in which thememory card 1A is inserted into an electronic device. - The
memory card 1A of the first embodiment can be used as an auxiliary storage unit of various portable electronic devices including information processing units such as portable computers, image processing units such as digital cameras, or communication devices such as cellular phones. Thememory card 1A is formed from a plane rectangular, small thin plate having a chamfered part. Its contour dimensions are about 24 mm in width (second length) W1, about 18 mm in length (first length) L1, and about 1.4 mm in depth D1. Thememory card 1A has the same contour specifications and functions as multimedia cards (hereinafter simply referred to as RSMMC) of so-called reduced size. The contour size allows the memory card to be used as, e.g., small-size electronic devices such as cellular phones and digital cameras. However, by converting the memory card into a full-size MMC (hereinafter simply referred to as FSMMC) using an adapter (auxiliary instrument), the memory card can also be used for relatively large-size electronic devices such as portable personal computers. - A
sheet metal cap 2 forming the appearance of thememory card 1A is formed of an insulating resin such as ABS resin and PPE (Poly Phenylen Ether) in terms of weight reduction, machinability, and flexibility. To improve mechanical strength, a glass-reinforced fiber having higher tensile strength per sectional area than the above-mentioned insulating resin forming thecap 2 is mixed into the resin. Achamfered part 2 a at one corner at the front side of thecap 2 is used for index. A small recess (second recess) 2 b formed on a short side of thecap 2 on the side of thechamfered part 2 a is provided to realize a latch mechanism for holding thememory card 1A in an electronic device to prevent thememory card 1A incorporated in the electronic device from being forcibly extracted, or prevent thememory card 1A from popping out when the electronic device is dropped. The length L2 of therecess 2 b is about 1.5±0.1 mm, and the length L3 is about 0.55±0.1 mm. Therecess 2 b, when viewed from a side thereof, is formed to terminate in the middle of thickness of thecap 2 from the principal surface (first surface), so that its depth is about 0.65±0.1 mm. Although therecess 2 b can be provided at plural locations, when toomany recesses 2 b were provided, the mechanical strength of thecap 2 would decrease. Therefore, in the first embodiment, therecess 2 b is provided only at the side of one side of thememory card 1A. Thereby, the mechanical strength of thecap 2 can be maintained. For RSMMC, since the length L1 of thememory card 1A in the direction of the arrow A is shorter than the width W1 orthogonal to it, and the length of a card guide of a connector to which thememory card 1A is attached becomes short, when a connector for pressing the sides of thememory card 1A is used, thememory card 1A is liable to disconnect from the connector due to rotary deviation (rotation direction within a surface parallel to the principal surface of thememory card 1A). Accordingly, in that case, therecess 2 b may be provided at each of sides opposite to each other of thecap 2. Since rotary deviation can be prevented by this construction, the ability to prevent thememory card 1A from falling off can be increased. Therecess 2 b will be described in detail later.Adapter attaching parts 2 c having a convex cross section at both corners at the back of thecap 2 are fitted into recesses of the adapter for converting RSMMC into FSMMC. An adapterclaw attaching part 2 d at the center in a longitudinal direction in the vicinity of the back of the back surface of thecap 2 is engaged with a claw of the adapter. A planetriangular mark 2 e at the front side of the principal surface of thecap 2 indicates the direction in which thememory card 1A is inserted into a desired electronic device. Anindentation 2 f is used to stick a seal capable of describing various information (classification of thememory card 1A, etc.). Agroove 2 g is a groove for removing the card. - On the back surface of the cap 2 (second surface, part housing surface), a
recess 2 h (first recess) is formed. Therecess 2 h is formed in stepped form with ashallow recess 2h 1 and adeep recess 2h 2. In the outer circumference of therecess 2 h, aframe part 2 i is formed so as not to compromise its continuity along the direction of the outer circumference. By theframe part 2 i, the mechanical strength of thethin cap 2 is maintained. Both corners of therecess 2 h at the back of thecap 2 are chamfered and the width of theframe part 2i 1 in those portions is expanded to enhance the mechanical strength of thecap 2. A memory body 3 (electronic part body) is fitted in and bonded to or placed into tight contact with therecess 2 h. Thememory body 3 includes awiring board 3 a, semiconductor chips (hereinafter simply referred to as chips) 3 b (3b wiring board 3 a, and a sealingpart 3 c for sealing thechips 3 b. Thewiring board 3 a of thememory body 3 has a wiring structure in which one or plural metal wiring layers (wiring) are formed in an insulator such as resins of a glass epoxy system. The wiring for the principal surface of thewiring board 3 a is electrically connected withexternal terminals 3 d of the back surface of thewiring board 3 a via through holes. InFIGS. 2 and 4 , e.g., 13external terminals 3 d are arrayed along the longitudinal direction of thewiring board 3 a. In another case, as shown inFIG. 9 , e.g., seven external terminals may be arrayed in a row along the longitudinal direction of thewiring board 3 a. The plane contour of thewiring board 3 a is formed to be rectangular, and its three corners are chamfered. - On the principal surface of the
wiring board 3 a (chip mounting surface), twochips 3 b 1 and 3 b 2 different in plane size are mounted with their principal surfaces (device forming surfaces) upward and their back surfaces bonded to thewiring board 3 a by an adhesive or the like. The twochips 3 b 1 and 3 b 2 are disposed in line along the longitudinal direction of thewiring board 3 a (that is, the disposition direction of the pluralexternal terminals 3 d). On thechip 3b 1 having a relatively large plane size, a flash memory (EEPROM: Electrically Erasable Programmable Read Only Memory) having a memory capacity of 16M bytes (128M bits), 32M bytes (256M bits), or 64M bytes (512M bits) is formed. Of course,plural memory chips 3b 1 may be arrayed on the principal surface of thewiring board 3 a to obtain a desired memory capacity in total. Also, the chips may be stacked in layers to obtain a desired memory capacity in total. When the chips are stacked in layers, a large capacity can be obtained on a small occupation area. Thechip 3b 1 is disposed at a position distant from the chamfered part for index. In the vicinity of one side of a principal surface of thememory chip 3b 1, plural pointing pads (hereinafter referred to as pads) PD1 are disposed along the side. The pads PD1 are electrically connected with the wiring of the principal surface of thewiring board 3 a through bonding wires WR1. The bonding wires WR1 are formed of metallic thin wires such as gold (Au). On the other hand, on thechip 3b 2 having a relatively small plane size, a controller is formed which controls the operation of a flash memory circuit of thechip 3b 1. Thechip 3b 2 is disposed near the chamfered part for index. On the principal surface of thechip 3b 2 for the controller, in the vicinity of two opposite long sides, plural pads PD2 are disposed in a row along each of the long sides. The pads PD2 are electrically connected with the wiring of the principal surface of thewiring board 3 a through bonding wires WR2. - The
chips 3 b 1 and 3 b 2, the bonding wires WR1 and WR2, and most of the principal surface of thewiring board 3 a are covered by the sealingpart 3 c made of resin and the like of epoxy system. The sealingpart 3 c is housed in thedeep recess 2h 2 side of thecap 2, and an outer circumferential portion of the principal surface of thewiring board 3 a exposed from the sealingpart 3 c contacts the upper surface of a stepped portion of theshallow recess 2h 1 of thecap 2 and is bonded by an adhesive. - Next, with reference to
FIGS. 10 to 13 , a description will be made of how thememory card 1A is attached to a connector of an electronic device.FIG. 10 shows thememory card 1A before being attached to theconnector 5.FIG. 11 shows thememory card 1A ofFIG. 10 when viewed from a right side thereof.FIG. 12 shows thememory card 1A after being attached to theconnector 5.FIG. 13 is a right side view ofFIG. 12 . - When the
memory card 1A is inserted into theconnector 5 along the direction of the arrow A, the tip of thelock claw 5 a of theconnector 5 enters therecess 2 b at a side of thememory card 1A. Acoil spring 5 b is attached to another end of thelock claw 5 a, and thelock claw 5 a is urged in the direction of the side of thememory card 1A. This prevents thememory card 1A from falling off theconnector 5. That is, since thememory card 1A can be firmly supported by thelock claw 5 a of theconnector 5 by providing thememory card 1A with therecess 2 b, thememory card 1A can be prevented from falling off theconnector 5. - When the
memory card 1A is inserted into theconnector 5, the tips of 13metallic contact pins 5 d attached to aconnector body 5 c contact theexternal terminals 3 d of thememory card 1A. The contact pins 5 d are formed in the shape of flat springs, and their tips are urged to the back surface of thememory card 1. Thereby, the tips of the contact pins 5 d tightly contact theexternal terminals 3 d. An metallicupper shell 5 e of theconnector 5 is provided with an elastic claw integrated with it, and by the elasticity claw, thememory card 1A is urged in a direction indicated by the arrow B ofFIG. 13 . Thereby, since thememory card 1A is pressed against the contact pins 5 d when inserted into the connector, the tips of the contact pins 5 d tightly contact theexternal terminals 3 d. This construction brings the contact pins 5 d of theconnector 5 into a satisfactory electrical connection with theexternal terminals 3 d of thememory card 1A. - When the
memory card 1A has been inserted into theconnector 5, aslider 5 f ofconnector 5 is slid in the direction of the arrow A by thememory card 1A and thememory card 1A is locked. As a method of ejecting thememory card 1A, e.g., a push-push system is adopted. Specifically, when the back of thememory card 1A inserted into theconnector 5 is lightly pushed in the direction of the arrow A, thememory card 1A is unlocked and lightly pops out backward by an urging force of acoil spring 5 g, so that thememory card 1A can be easily removed from theconnector 5. - Next, a description will be made of the
recess 2 b for preventing thememory card 1A from falling off. -
FIG. 14 is a perspective view showing major parts of thecap 2 when therecess 2 b of thememory card 1A is viewed from the principal surface of thecap 2.FIG. 15 is a perspective view showing major parts of thecap 2 when therecess 2 b of thememory card 1A is viewed from the back surface of thecap 2.FIGS. 16 and 17 , which are shown for comparison, are perspective views showing major parts of thecap 2 on the principal surface and the back surface when therecesses 50 for preventing the memory card from falling off penetrate from the principal surface to the back surface of thecap 2. - As shown in
FIGS. 14 and 15 , in the first embodiment, therecess 2 b does not penetrate from the principal surface to the back surface of thecap 2, a resin part ofcap 2 is left at the bottom of therecess 2 b, and the continuity of theframe part 2 i of the back surface of thecap 2 is maintained. Thereby, the mechanical strength of thecap 2 can be maintained. Specifically, as shown inFIGS. 16 and 17 , when therecess 50 for preventing the memory card from falling off penetrates from the principal surface to the back surface of thecap 2, theframe part 2 i of the back surface of thecap 2 maintaining the mechanical strength of thethin cap 2 becomes thin partially and its continuity is compromised, with the result that the mechanical strength of thecap 2 decreases. In contrast to this, in the first embodiment, since a resin part of thecap 2 is left at the bottom of therecess 2 b, and therecess 2 b does not compromise the continuity of theframe part 2 i of the back surface of thecap 2 so that the continuity of theframe part 21 is maintained. By this construction, the mechanical strength of thecap 2 can be maintained even when therecess 2 b for falling-off prevention is provided in thethin cap 2. - As shown in
FIGS. 14 and 15 , in the first embodiment, therecess 2 b is formed on the principal surface of thecap 2 and does not penetrate from the principal surface to the back surface of thecap 2. Therefore, according to the first embodiment, thememory card 1A can be prevented from moving in amemory card 1A attaching/detaching direction indicated by the arrow C of thememory card 1A, and also from moving in the thickness direction of thememory card 1A indicated by the arrow E. Specifically, since thememory card 1A inserted into theconnector 5 is thin, it may shake in the direction of the arrow E because of external shocks. As shown inFIGS. 16 and 17 , when therecess 50 for preventing the memory card from falling off penetrates from the principal surface to the back surface of thecap 2, since there is no part to prevent the memory card from moving in the direction of the arrow E, the memory card cannot be prevented from shaking, and theexternal terminals 3 d of the memory card and the contact pins 5 d of the connector may disconnect momentarily. To prevent this problem, it is conceivable to provide a member for preventing shakes in the thickness direction of the memory card. In this case, however, there is a problem in that the number of parts increases and the connector cost is increased. Also, theconnector 5 tends to be more compact and lighter in weight, and therefore it is difficult to provide new parts and mechanisms. In contrast to this, in the first embodiment, a resin part of thecap 2 is left at the bottom of therecess 2 b and there can be provided a part to prevent thememory card 1A from moving in the direction of the arrow E. By this construction, thememory card 1A in theconnector 5 can be prevented from shaking in the direction of the arrow E, and a momentary poor connection between theexternal terminals 3 d of thememory card 1A and the contact pins 5 d of theconnector 5 can be prevented. Since a mechanical part for falling-off prevention of thememory card 1A also serves as a mechanism for preventing thememory card 1A from shaking, new parts and mechanisms do not need to be added. Therefore, the memory card of this embodiment will neither cause an increase in costs of theconnector 5 nor hamper the trend to make theconnector 5 more compact and lighter in weight. -
FIG. 18 is a side view showing major parts of thecap 2.FIGS. 19 and 20 respectively show the depth of therecess 2 b. As shown inFIG. 18 , the depth D2 of therecess 2 b is about a third to two thirds of the thickness D1 of thecap 2, preferably about two fifths to three fifths, more preferably half the thickness of thecap 2. Half the thickness of thecap 2 referred to here is not only the actual half 0.7 mm but also includes a range of error. That is, when a range of error is e.g., ±10.1 mm, half the thickness of thecap 2 referred to here is 0.6 to 0.8 mm. The reason for this is that, as shown inFIGS. 19 and 20 , when thecap 2 is bent, since a neutral plane of a compressive stress F and a tensile stress G occurs at a location half the thickness of thecap 2, by forming the bottom of therecess 2 b in the neutral plane position or its vicinity, the bottom of therecess 2 b can be less affected by the compressive stress and the tensile stress. As a result, according to the first embodiment, cracks can be inhibited or prevented from occurring at bothcorners 2b 1 of the bottom of therecess 2 b due to the bend stress of thecap 2. In the first embodiment, round tapers are formed at bothcorners 2b 1 of the bottom of therecess 2 b. By this construction, since stress applied to the bothcorners 2b 1 at the bottom of therecess 2 b can be dispersed, cracks can be further inhibited or prevented from occurring at bothcorners 2b 1 of the bottom of therecess 2 b due to the bend stress of thecap 2. Accordingly, the mechanical strength of thecap 2 can be maintained even when therecess 2 b for falling-off prevention is provided in thethin cap 2. -
FIG. 21 schematically shows glass-reinforcedfibers 8 on the side of thecap 2. When therecess 2 b is too deep, the orientation of the glass-reinforcedfibers 8 falls into disorder, so that the mechanical strength of thecap 2 may be lost. Accordingly, in the first embodiment, as shown inFIGS. 22 and 23 , the depths of therecess 2 b is designed so as not to heavily disorder the orientation of the glass-reinforcedfiber 8 contained in thecap 2. Specifically, among the glass-reinforcedfibers 8 contained under therecess 2 b of the cap 2 (especially theframe part 2 i), more glass-reinforcedfibers 8 are oriented along the longitudinal direction of theframe part 2 i than along other directions. By this construction, the mechanical strength of theframe part 2 i of thecap 2 can be enhanced, and the mechanical strength of the cap 2 (rigidity to bending and twisting) can be enhanced. To form such a construction, the depth of therecess 2 b has only to be set so that a resin having a thickness of 0.15 mm or longer, preferably 0.2 mm or longer, is left at the bottom of therecess 2 b. -
FIGS. 24 and 25 show overall plan views of the back surface of thecap 2. In the first embodiment, as shown inFIG. 24 , therecess 2 b is formed so that its depth length L3 is smaller than the width w2 of theframe part 2 i. In this case, the width W2 of theframe part 2 i is about 0.6±0.1 mm, for example. However, depending on products, performance improvement and an increase in chip size force the plane area of thewiring board 3 a to be expanded, so that, in some cases, the width offrame part 2 i may be decreased accordingly. On the other hand, the depth length L3 of therecess 2 b must be about 0.5 to 0.6 mm to maintain the ability to prevent thememory card 1A from falling off. As a result, as shown inFIG. 25 , the depth length L3 of therecess 2 b becomes greater than the width W3 of theframe part 2 i, and part of therecess 2 b overlaps an area of therecess 2 h. When therecess 2 b is thus made too deep on the condition that depth length L3>width W3, as shown inFIGS. 26 and 27 , therecess 2 b will penetrate therecess 2 h, and a part (a coating side of an adhesive) of the principal surface (chip mounting surface) of thewiring board 3 a will be exposed. The depth length L3 of therecess 2 b should be preferably long to enhance the ability to prevent thememory card 1A from falling off. However, when therecess 2 b is excessively extended to the right direction ofFIG. 26 , therecess 2 b will penetrate therecess 2 h at a side of therecess 2 b.FIG. 26 is a sectional view along the line X2-X2 ofFIG. 25 .FIG. 27 is a perspective view showing major parts of therecess 2 b of thecap 2 ofFIG. 26 . - Accordingly, in the first embodiment, as shown in
FIG. 28 , when depth length L3>width W3, the depth D2 of therecess 2 b is set so that therecess 2 b does not penetrate therecess 2 h. Therecess 2 h is provided with theshallow recess 2h 1 and thedeep recess 2h 2, and therecess 2 b overlaps an area of theshallow recess 2h 1 to secure a resin thickness between therecess 2 b and thedeep recess 2h 2. This prevents therecess 2 b from penetrating therecess 2 h at its bottom and side.FIG. 28 is a sectional view taken along the line X2-X2 ofFIG. 25 in the case of the first embodiment. Theshallow recess 2h 1, whose depth D3 is about 0.4 mm, is used to house thewiring board 3 a of thememory body 3. Thedeep recess 2h 2, whose depth D4 is about 1 mm, is used to house the sealingpart 3 c of thememory body 3. -
FIG. 29 shows a side of thememory card 1A when attached to or detached from theconnector 5.FIG. 30 enlargedly shows a contact portion between thecap 2 and a guide part when therecess 2 b exists on the back surface of thecap 2 of thememory card 1A. As described above, when thememory card 1A is attached or detached, it is slid in the horizontal direction ofFIG. 29 with pressure applied to thememory card 1A in the direction of the arrow B so that theexternal terminals 3 d of thememory card 1A, and the contact pins 5 d of theconnector 5 are brought into a satisfactory contact with each other. As a result, the back surface on the outer circumference side of thememory card 1A is pressed against aguide part 5 h of aplastic connector body 5 c of theconnector 5, and both members are slid in the horizontal direction ofFIG. 29 while rubbing against each other. As a result, as shown inFIG. 30 , when therecess 2 b is provided on the back surface of thecap 2, both thecap 2 and theguide part 5 h may be damaged, such as the upper surface of theguide part 5 h that is shaved by therecess 2 b. Especially, for RSMMC, since the short sides of the card compel the whole area of the back surface at the sides to be used as the guide part of the card, when therecess 2 b is provided on the back surface of thecap 2, therecess 2 b will contact theguide part 5 h of theconnector 5 without fail. In contrast to this, in the first embodiment, by providing therecess 2 b on the principal surface of thecap 2, since the smoothness of the back surface of thecap 2 is maintained, damages due to contact between thecap 2 and theguide part 5 h when thememory card 1A is attached or detached can be reduced. Therefore, the life of thememory card 1A and theconnector 5 can be extended. -
FIG. 31 is a plan view of the principal side of thememory card 1A when anadapter 9 is attached to thememory card 1A (RSMMC).FIG. 32 is a side view of thememory card 1A ofFIG. 31 .FIG. 33 is a plan view of the back surface of thememory card 1A ofFIG. 31 . By attaching theadaptor 9 to thememory card 1A, RSMMC can be converted into FSMMC, that is, FSMMC size (e.g., 32 mm×24 mm×1.4 mm). Therecess 2 b for falling-off prevention is exposed at one side of the principal surface of the convertedmemory card 1A, and the convertedmemory card 1A can also be prevented from falling off and popping out of an electronic device. - In the second embodiment, FSMMC will be described.
FIG. 34 is an overall plan view of the principal surface of amemory card 1B of the second embodiment.FIG. 35 is an overall plan view of the back surface of thememory card 1B ofFIG. 34 .FIG. 36 is a sectional view taken along the line Y2-Y2 ofFIG. 35 . - The
cap 2 of thememory card 1B of the second embodiment is larger in its plane size than thecap 2 of thememory card 1A of the first embodiment, and is, for example, about 32 mm in length L4, about 24 mm in width W1, and 1.4 mm in depth D1. Thecap 2 of thememory card 1B does not require a part for attaching an adapter for size conversion. In other points, thememory card 1B is the same as the memory card of the first embodiment. - The
memory card 1B of the second embodiment also has therecess 2 b formed at the side of one side of the principal surface of thecap 2 as in the first embodiment. This construction enables thememory card 1B to be prevented from falling off and popping out of an electronic device. - In the third embodiment, a method of assembling the
memory cards FIGS. 37 to 41 .FIGS. 37 to 41 are plan views of the principal surface of aboard frame 10 in the process of assembling the memory cards. - As shown in
FIG. 37 , the strap-like board frame 10 is provided. Toframe members 10 a of theboard frame 10,plural wiring boards 3 a are connected throughfine coupling parts 10 b connected to the center of two short sides thereof. In this stage, theframe members 10 a, thecoupling parts 10 b, and thewiring boards 3 a are integrally formed. The three corners of thewiring board 3 a are chamfered. Next, as shown inFIG. 38 , afterchips 3 b 1 and 3 b 2 are mounted on the principal surface of the eachwiring board 3 a of theboard frame 10, surfaces including wirings and electrodes (pads PD1 and PD2) of thewiring boards 3 a and thechips 3 b 1 and 3 b 2 are cleaned by e.g., plasma cleaning processing. Then, as shown inFIG. 39 , the pads PD1 and PD2 of thechips 3 b 1 and 3 b 2 of the eachwiring board 3 a, and the wiring and electrodes of thewiring board 3 a are electrically connected by bonding wires WR1 and WR2. Next, as shown inFIG. 40 , thechips 3 b 1 and 3 b 2 of the eachwiring board 3 a of theboard frame 10, and the bonding wires WR1 and WR2, and the like are collectively sealed by the transfer molding method, and a sealingpart 3 c is formed on the eachwiring board 3 a. Next, as shown inFIG. 41 , by cutting thecoupling parts 10 b, thewiring boards 3 a are separated from theboard frame 10 to manufacture thememory body 3. Then, when FSMMC is manufactured, thememory body 3 is fitted in therecess 2 h of thecap 2 shown byFIGS. 1 to 5 of the first embodiment and fixed by an adhesive. Thus, thememory card 1A of the first embodiment is manufactured. On the other hand, when FSMMC is manufactured, thememory body 3 is fitted in therecess 2 h of thecap 2 shown byFIGS. 34 to 36 of the second embodiment and fixed by an adhesive. Thus, thememory card 1B of the second embodiment is manufactured. - Hereinbefore, though the invention made by the inventors has been described in detail based on preferred embodiments, it goes without saying that the present invention is not limited to the preferred embodiments, but may be modified in various ways without changing the main purports of the present invention.
- For example, as a method of connecting chips, a connection method using bump electrodes can be adopted.
- The above description has been dominated by application of the invention made by the inventors to a memory card incorporating a flash memory (EEPROM), which is an application field of the invention. However, the present invention is not limited to such a memory card; it can also apply to a memory card incorporating another memory circuit such as SRAM (Static Random Access Memory), FRAM (Ferroelectric Random Access Memory), or MRAM (Magnetic Random Access Memory). Also, it can apply to an IC (integrated circuit) card having no memory circuit.
- The present invention can apply to the IC card industry.
Claims (6)
1-18. (canceled)
19. An IC card comprising:
a cap having a first surface and a second surface, which is a reverse surface thereof; and
an electronic part body secured in a first recess of the second surface of the cap,
wherein a second recess is configured to prevent the IC card from accidental disengagement from an electronic device,
the second recess is provided on one side of the cap, and
the second recess has a depth in a thickness direction of the cap such that the second recess terminates in an intermediate portion between the first and second surfaces.
20. The IC card according to claim 19 , wherein the depth of the second recess is one third to two thirds of the thickness of the cap.
21. The IC card according to claim 19 , wherein the IC card is a Reduced Size Multi-Media Card (RS-MMC) and the cap has dimensions in plan view satisfying the RS-MMC standard,
wherein the electronic part body comprises a sealing device, a first non-volatile memory chip, and a controller chip for the first non-volatile memory chip, and
wherein the first non-volatile memory chip and the controller chip are sealed by the sealing device.
22. The IC card according to claim 21 , further comprising a second non-volatile memory chip, wherein the second non-volatile memory chip is arranged over the first non-volatile memory chip.
23. The IC card according to claim 19 , wherein the cap has a first side and a second side, the first and second sides are arranged to be parallel to a first direction in which the IC card is inserted into the electronic device, the second recess is provided in the first side of the cap, and the second side is not provided with a second recess.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/182,070 US20080283619A1 (en) | 2003-10-20 | 2008-07-29 | Ic card |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-359824 | 2003-10-20 | ||
JP2003359824A JP2005122657A (en) | 2003-10-20 | 2003-10-20 | Ic card |
US10/961,136 US7416133B2 (en) | 2003-10-20 | 2004-10-12 | IC card |
US12/182,070 US20080283619A1 (en) | 2003-10-20 | 2008-07-29 | Ic card |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/961,136 Continuation US7416133B2 (en) | 2003-10-20 | 2004-10-12 | IC card |
Publications (1)
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US20080283619A1 true US20080283619A1 (en) | 2008-11-20 |
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ID=34509894
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Application Number | Title | Priority Date | Filing Date |
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US10/961,136 Active 2025-12-31 US7416133B2 (en) | 2003-10-20 | 2004-10-12 | IC card |
US12/182,070 Abandoned US20080283619A1 (en) | 2003-10-20 | 2008-07-29 | Ic card |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/961,136 Active 2025-12-31 US7416133B2 (en) | 2003-10-20 | 2004-10-12 | IC card |
Country Status (5)
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US (2) | US7416133B2 (en) |
JP (1) | JP2005122657A (en) |
KR (1) | KR20050037963A (en) |
CN (1) | CN1610194A (en) |
TW (1) | TW200528008A (en) |
Cited By (2)
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US20150286919A1 (en) * | 2012-03-29 | 2015-10-08 | Sandisk Technologies Inc. | Memory Card |
US10380055B2 (en) | 2014-06-30 | 2019-08-13 | Samsung Electronics Co., Ltd. | Memory card having multi-row terminals |
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WO2007010595A1 (en) * | 2005-07-19 | 2007-01-25 | Renesas Technology Corp. | Semiconductor device and method for manufacturing same |
JP4860436B2 (en) * | 2006-11-07 | 2012-01-25 | トッパン・フォームズ株式会社 | IC card and manufacturing method thereof |
GB2490501A (en) * | 2011-05-03 | 2012-11-07 | Kevin Coppard | Grip system cut or molded into an electronic circuit card |
USD736212S1 (en) * | 2014-07-01 | 2015-08-11 | Samsung Electronics Co., Ltd. | Memory card |
USD736213S1 (en) * | 2014-07-01 | 2015-08-11 | Samsung Electronics Co., Ltd. | Memory card |
USD739856S1 (en) * | 2014-07-30 | 2015-09-29 | Samsung Electronics Co., Ltd. | Memory card |
USD736216S1 (en) * | 2014-07-30 | 2015-08-11 | Samsung Electronics Co., Ltd. | Memory card |
USD783622S1 (en) * | 2015-08-25 | 2017-04-11 | Samsung Electronics Co., Ltd. | Memory card |
USD783621S1 (en) * | 2015-08-25 | 2017-04-11 | Samsung Electronics Co., Ltd. | Memory card |
USD772232S1 (en) * | 2015-11-12 | 2016-11-22 | Samsung Electronics Co., Ltd. | Memory card |
USD773467S1 (en) * | 2015-11-12 | 2016-12-06 | Samsung Electronics Co., Ltd. | Memory card |
USD848431S1 (en) * | 2016-01-19 | 2019-05-14 | Sony Corporation | Memory card |
USD887998S1 (en) * | 2017-02-17 | 2020-06-23 | Stat Peel Ag | Chip |
JP1621567S (en) * | 2018-06-13 | 2019-01-07 | ||
US10999929B2 (en) * | 2019-05-29 | 2021-05-04 | Quanta Computer Inc. | Expansion card interfaces for high-frequency signals and methods of making the same |
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- 2004-10-12 US US10/961,136 patent/US7416133B2/en active Active
- 2004-10-19 KR KR1020040083488A patent/KR20050037963A/en not_active Application Discontinuation
- 2004-10-20 CN CNA200410086063XA patent/CN1610194A/en active Pending
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US10380055B2 (en) | 2014-06-30 | 2019-08-13 | Samsung Electronics Co., Ltd. | Memory card having multi-row terminals |
Also Published As
Publication number | Publication date |
---|---|
US20050082375A1 (en) | 2005-04-21 |
CN1610194A (en) | 2005-04-27 |
KR20050037963A (en) | 2005-04-25 |
TW200528008A (en) | 2005-08-16 |
US7416133B2 (en) | 2008-08-26 |
JP2005122657A (en) | 2005-05-12 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |