JP2007213998A - Connector for substrate, and circuit body connection structure having same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecter for a substrate and a circuit body connection structure having the same capable of improving reliability of transmission quality and a high-speed transmission property of a differential signal. <P>SOLUTION: The circuit body connection structure 1 is provided with a printed wiring board 2 including a signal line and ground line formed on at least one board surface of an insulating substrate, and the connector 15 for the substrate used for electrically connecting the printed wiring board 2 and an FPC 10. A plurality of pairs of the signal lines electrically contacting with a substrate side electric contact part of a signal contact housed in the connector 15 for the substrate is positioned in front of the connector 15 for the substrate fixed on a board surface of the printed wiring board 2, and the ground line electrically connected with the substrate side electric contact part of the ground contact housed in the connector 15 for the substrate is positioned behind the connector 15 for the substrate so that the signal line and ground line face each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is for a board that includes a connector housing having a contact housing chamber and a plurality of contacts housed in the contact housing chamber, and electrically interconnects a circuit body and a wiring board via the contact. The present invention relates to a connector and a circuit body connection structure having the connector.

  In general, as an example of a board connector for electrically interconnecting a circuit body and a wiring board via a contact housed in a connector housing, one disclosed in Patent Document 1 is known. The board connector includes a connector housing having a contact housing chamber and a plurality of contacts housed in the contact housing chamber. The contact is formed with a circuit body-side electrical contact portion that is in electrical contact with the circuit body at one end, and a substrate-side electrical contact portion that is in electrical contact with the wiring board at the other end. The contacts are arranged side by side in a state where the board-side electrical contact portions are exposed from one side of the connector housing. The wiring board has a plurality of wiring conductors formed at a predetermined pitch at a position corresponding to the board-side electrical contact portion.

  However, in this board connector, all the contacts are provided in a state in which their orientations are aligned in one direction, that is, in a state where the board-side electrical contact portion of the contact is extended from one side of the connector housing. There is a problem that it cannot be applied to a so-called fine pitch wiring board in which the pitch of the wiring conductor is narrow.

  As another example of the board connector, Patent Document 2 discloses that a board-side electrical contact portion of a contact is alternately arranged on both sides of a connector housing. This board connector is applicable to a fine pitch wiring board as compared with the board connector described above. However, the wiring board 50 shown in FIG. 7 to which this type of board connector is applied has various problems that hinder the reliability of signal transmission.

  A wiring board 50 shown in FIG. 7 is a wiring board used for transmitting image information by digital signals, and a plurality of pairs of digital signals (differential signals) with low voltage and high frequency are used. This is a wiring board that is used to perform high-speed transmission of several hundred Mbps or more by flowing in opposite phases with signal lines (differential pairs) 51 and 52. In addition, a ground line 53 is also formed on the wiring board 50 in order to increase the transmission reliability of the differential signal. That is, the wiring board 50 has a wiring pattern equivalent to the pseudo coaxial cable.

  However, in this wiring board 50, since the signal lines 51 and 52 and the ground line 53 are not arranged and mixed, an extra empty space is generated in the board 50, and the pitch of the signal lines 51 and 52 is increased. There was a limit to narrowing. In addition, there are places where the distance between the adjacent signal lines 51 and 52 is locally narrowed and the distance between the insulation cannot be obtained, which makes it difficult to solder or causes a short circuit between the signal lines due to soldering. was there. There is a problem that not only the wiring structure of the board becomes complicated and expensive, but also the design change of the wiring board cannot be flexibly handled.

  Further, of the pair of signal lines 51 and 52, one signal line 51 is formed on the surface of the wiring substrate 50, and the other signal line 52 is interposed between the front surface and the back surface of the wiring substrate 50 through the through conductor 57. Since they are bridged, the conductor lengths of the pair of signal lines 51 and 52 are different, the skew value of the differential signal in the pair of signal lines 51 and 52 is increased, and the differential signal in the opposite phase cannot be synchronized, There was a problem that the reliability of signal transmission was lowered.

  As shown in FIG. 8, there are two types of signal contacts 55 and 56, that is, a circuit body side electric contact portion 58 and a board side electric contact portion 59, as shown in FIG. And a contact 56 having a circuit body side electrical contact portion 58 and a substrate side electrical contact portion 59 in opposite directions, and the former contact 55 has a U-turn signal. As a result, the signal is likely to be reflected in the high frequency region, resulting in a problem that transmission reliability is lowered.

  The above-mentioned problem of signal transmission degradation is more likely to occur as the frequency of transmission signals increases and the speed increases, so digital broadcasting televisions, mobile phones, and the like that are expected to become more popular. There has been a concern that the image quality of the image may be degraded.

No. 7-19102 Utility model registration number 2597004

  Accordingly, an object of the present invention is to provide a board connector and a circuit body connection structure having the board connector that can improve the reliability of transmission quality and enhance the high-speed transmission of differential signals.

  In order to solve the above problem, the board connector invention of claim 1 of the present invention comprises a connector housing having a contact housing chamber and a plurality of contacts housed in the contact housing chamber. In the board connector for electrically interconnecting the circuit body and the wiring board having a wiring structure of a predetermined pattern via the child, the plurality of contacts are a plurality of pairs of signal contacts and a plurality of ground contacts. The signal contact is a contact for transmitting a differential signal in a state where a positive signal and a negative signal having opposite phases are synchronized with each other, and one end of the circuit contact is electrically contacted with a conductor portion of the circuit body. A circuit board side electrical contact part that contacts the conductor part of the wiring board located in the opposite direction to the circuit body side electrical contact part at the other end, and the ground contactor has the circuit at one end. Electrical contact with body conductors A circuit body-side electrical contact portion that has a board-side electrical contact portion that contacts the conductor portion of the wiring board located in the same direction as the circuit body-side electrical contact portion at the other end. The side electrical contacts are located on opposite sides of each other.

  According to a second aspect of the present invention, in the board connector according to the first aspect, the ground contact is arranged outside each pair of the signal contacts.

  The invention of the circuit body connection structure according to claim 3 is for electrically connecting the wiring board having the signal line and the ground line formed on at least one plate surface of the insulating board, and the wiring board and the circuit body. A circuit body connection structure comprising the board connector according to claim 1 or 2, wherein the circuit body connection structure is in electrical contact with a board-side electrical contact portion of the signal contact housed in the board connector. A plurality of pairs of the signal lines are located on the front side of the board connector fixed to the plate surface of the wiring board, and are electrically connected to the board-side electrical contact portion of the ground contact housed in the board connector. The ground line to be connected is located on the rear side of the board connector, and the signal line and the ground line are opposed to each other.

  According to a fourth aspect of the present invention, in the circuit body connection structure according to the third aspect, the conductor lengths of the signal lines adjacent to each pair are equal to each other.

  According to a fifth aspect of the present invention, in the circuit body connection structure according to the third or fourth aspect, the circuit body is a flexible printed circuit.

  According to the invention described in claim 1 of the present application, since the one electrical contact portion and the other electrical contact portion of the signal contact are located in opposite directions, the differential signal flowing through the signal contact is The flow direction does not change by 90 ° or more, and reflection of a differential signal in the signal contact can be reduced. Since the pair of signal contacts are contacts having substantially the same shape, the skew value between the differential pairs can be reduced. Therefore, the reliability of transmission quality can be improved and the high-speed transmission performance of differential signals can be improved.

  According to the second aspect of the present invention, since the ground contact is arranged outside each pair of signal contacts, the ground contact is used as a connector for high-speed differential signal transmission using digital interface technology (Transition Minimized Differential Signaling). be able to.

  According to the third aspect of the present invention, since the signal lines and the ground lines are arranged separately on one side and the other side on the surface of the wiring board and face each other, the wiring pattern can be easily formed. Can be simplified. In addition, due to the synergistic effect of the wiring board and the board connector, it is possible to provide a circuit structure excellent in transmission quality reliability and high-speed transmission of differential signals.

  According to the fourth aspect of the present invention, since the conductor lengths of the adjacent signal lines in each pair are equal to each other, the skew value of the differential signal in the pair of signal lines can be reduced. Therefore, the high-speed transmission property of the differential signal can be further enhanced.

  According to the invention described in claim 5, since the circuit body is a flexible printed circuit, the handleability of the circuit body connection structure is improved, and the connector can be reduced in height and size.

  Specific examples of embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a board connector and a circuit body connection structure having the board connector according to the present invention. The circuit body connection structure 1 of the present embodiment is applied to a digital signal receiver (not shown) that receives a high-speed differential signal, and has wiring conductors 5, 6, 7 on both front and back surfaces of the insulating substrate 3 (FIG. 2). ) Formed on a printed wiring board (wiring board) 2, a flexible printed circuit (FPC) 10 in which a plurality of circuit conductors 12 arranged in parallel at a predetermined pitch are printed on an insulating sheet 11 (FIG. 4), The circuit board connector 15 is used to electrically connect the wiring board 2 and the FPC 10. The connector 15 includes a connector housing 30 having a contact housing chamber 38, and a plurality of contacts 17, 18, 25 (FIG. 3) that are housed in the contact housing chamber 38 and electrically connect the printed wiring board 2 and the FPC 10. 4).

  As shown in FIG. 2, the printed wiring board 2 has a rectangular flat plate shape, for example, and an insulating substrate 3 made of an organic material such as an epoxy resin, signal lines 5 and 6 as wiring conductors, and a ground line 7. Are printed together. As the epoxy resin constituting the insulating substrate 3, a paper base epoxy resin, a glass cloth base epoxy resin, a glass cloth / paper composite base epoxy resin, or the like is applied. A conductive metal foil having a thickness of several tens of μm, such as a copper foil, is applied to the wiring conductor constituting the predetermined wiring pattern. In the present embodiment, the printed wiring board 2 as a wiring board will be described, but a narrow wiring conductor may be formed on the insulating substrate 3 by insert molding or adhesion. Further, a conductive resin material may be applied as the wiring conductor.

  The printed wiring board 2 of this embodiment is a so-called double-sided printed wiring board, and wiring conductors are formed on both front and back surfaces. On the surface, a plurality of pairs of signal lines 5 and 6 for transmitting differential signals and contact points 7a of ground lines 7 facing the signal lines 5 and 6 are formed. The length of each pair of signal lines 5 and 6 is formed to be equal. A common or multiple ground lines 7 are formed on the back surface (not shown). The contact point contact portion 7a of the front surface ground wire 7 and the rear surface ground wire 7 are electrically connected via a through conductor 8 that bridges from the front surface to the back surface. In addition to the board connector 15, electronic devices such as transistors, capacitors, and resistors (not shown) are mounted on the printed wiring board 2 as necessary. An electronic device mounted on the printed wiring board 2 can be defined as a printed circuit board.

  A connector 15 is fixed in an empty space between the signal lines 5 and 6 facing each other and the contact point contact portion 7a of the ground line 7. The connector (see FIG. 3 and the like) 15 has a front side disposed toward the signal lines 5 and 6, a rear side disposed toward the ground line 7, and the FPC 10 is connected to the rear side of the connector 15. Yes. The ends of the signal lines 5 and 6 serve as contact points for connecting the signal contacts 17 and 18 of the connector 15. The line width and pitch of the adjacent signal lines 5 and 6 are arbitrary, but they are formed to dimensions that do not cause a problem when a differential signal (micro current) of several milliamperes flows.

  As described above, in the printed wiring board 2 according to the present invention, the signal lines 5 and 6 and the ground line 7 are separately formed on one side of the wiring board 2 so as to face each other. Therefore, it is possible to prevent the signal lines 5 and 6 and the ground line 7 from being mixed as in the conventional example, thereby complicating the wiring pattern, and within the limited space of the wiring board 2. The fine pitch of the signal lines 5 and 6 can be achieved. Further, since the conductor lengths of the adjacent signal lines 5 and 6 in each pair can be formed to be equal to each other, the skew value of the differential signal in the pair of signal lines 5 and 6 can be reduced. By reducing the skew value, the differential signal delay time difference between adjacent differential pairs is reduced, and the reliability of high-speed differential signal transmission can be increased. In addition, since the wiring structure is simple, it is possible to deal with a design change of the wiring board 2 with a considerable degree of freedom. In addition, the printed wiring board 2 can be easily manufactured, and the cost can be reduced.

  The FPC 10 as a circuit body includes a polymer insulating sheet 11, a circuit conductor 12 arranged in parallel on the insulating sheet 11 at a predetermined pitch, and a transparent or translucent protective layer. The insulating sheet 11 can be made of a constituent material such as an epoxy resin. The circuit conductor 12 is a metal foil such as a copper foil. In this embodiment, since FPC10 is used, the handleability of the circuit body connection structure 1 can be improved. Further, the connector 15 can be reduced in height and size.

  As shown in FIG. 3, the connector 15 includes contacts 17, 18, 25, a connector housing 30 that accommodates the contacts 17, 18, 25 in a row, and a rear wall of the connector housing 30. The slider 40 is mounted in the opening 36 and a shroud 45 as a fixing member for fixing the connector housing 30 to the printed wiring board 2.

  The contacts 17, 18, and 25 are the signal contacts 17 and 18 and the ground contact 25, and are formed by punching and bending a conductive substrate with a press. The signal contacts 17 and 18 are two types of contacts, that is, a pair of plus contact 17 and minus contact 18 that transmit a high-speed differential signal, and a plurality of pairs are provided. The two types of signal contacts 17, 18 have substantially the same shape except that their overall lengths are different, and have a pair of elastic clamping pieces 19 having circuit body side electric contact portions 20. A board-side electrical contact portion 21 is formed in the direction opposite to the circuit body-side electrical contact portion 20. The ground contact 25 includes an L-shaped elastic piece 26 having the circuit body-side electrical contact portion 20, and a board-side electrical contact portion 28 is formed in the same direction as the circuit body-side electrical contact portion 27.

  As described above, the signal contacts 17 and 18 and the ground contact 25 are different in the positions of the circuit body side electrical contact portions 20 and 27 and the board side electrical contact portions 21 and 28 and transmit differential signals having different polarities. In the signal contacts 17, 18, the circuit body-side electrical contact portion 20 and the board-side electrical contact portion 21 are provided in opposite directions to each other, and therefore, for high-speed differential signals applicable to the above-described printed wiring board 2. A connector 15 can be provided.

  Further, the high-speed differential signal flowing through the pair of plus contact 17 and minus contact 18 does not change the direction of signal flow at an angle exceeding 90 °, that is, as in the conventional example (see FIG. 8). Does not flow in a U-turn shape, it is possible to reduce the reflection of the differential signal. The reflection of the differential signal increases as the differential signal increases in speed and frequency, but the contacts 17 and 18 according to the present invention can improve the quality reliability of the signal transmitted at high speed. .

  Each contact 17, 17, 25 accommodated in the contact accommodating chamber 38 of the connector housing 30 is arranged so as to correspond to the signal lines 5, 6 and the ground line 7 of the printed wiring board 2, as shown in FIG. Has been. The ground contact 25 is disposed outside the pair of signal contacts 17 and 18. The wiring pattern of the signal lines 5 and 6 and the ground line 7 of the printed wiring board 2 and the contact arrangement of the connector 15 are configured such that digital interface technology (Transition Minimized Differential Signaling) can be used.

  As shown in FIG. 3, the connector housing 30 is injection-molded into a rectangular frame shape from a resin material such as polyethylene or polypropylene, and has a rectangular frame wall 31 and a contact accommodating chamber inside the frame wall 31. 38. The frame wall 31 includes a base wall 32, an upper wall 33 that faces the base wall 32, and left and right side walls 34. The front wall and the rear wall are formed with openings, the board-side electrical contact portions 21 of the signal contacts 17 and 18 are exposed from the front wall opening 35, and the circuit body-side electrical contact of the signal contactor 25 from the rear wall opening 36. The unit 20 faces and the FPC 10 is inserted.

  Here, the concept of the front-rear direction and the vertical direction of the connector housing 30 is defined as follows. The front in the front-rear direction refers to the side where the board-side electrical contact portion 21 of the signal contacts 17, 18 is located, and the rear in the front-rear direction refers to the circuit-body-side electrical contact portion 20 of the signal contacts 17, 18. It shall mean the side where it is located. “Upper in the vertical direction” means the side on which the shroud 45 is mounted, and “Lower in the vertical direction” means the side where the connector housing 30 faces the printed wiring board 2.

  Guide grooves 32 a and 33 a for guiding the inserted contacts 17, 18 and 25 are formed on the inner surfaces of the base wall 32 and the upper wall 33, respectively. The facing distance between the base wall 32 and the upper wall 33 depends on the thickness of the circuit body inserted between the pair of elastic clamping pieces 19 of the contacts 17 and 18 (see FIG. 5). Since the FPC 10 used in the present embodiment is thin, it is effective for reducing the size and height of the connector housing 30.

  Engagement frames 34 a are formed on the left and right side walls 34 to engage with locking pieces 47 that are bent at the left and right ends of the shroud 45. When the locking piece 47 is engaged with the engagement 34a frame, the connector housing 30 and the shroud 45 are integrated. The connector housing 30 integrated with the shroud 45 solders a pair of fixed legs 48 integrally formed on both sides of the shroud 45 to a soldering portion 9 (see FIG. 1) formed at a predetermined position of the printed wiring board 2. By being attached, it is fixed to the printed wiring board 2.

  The slider 40 is a holding member that is inserted from the rear wall opening 36 of the connector housing 30 and holds the contact state between the FPC 10 and the contacts 17, 18, and 25, and is a resin-molded integral part. The slide 40 includes a wall portion 41 having a slit 41a for allowing the FPC 10 to pass therethrough, a jaw portion 42 that extends forward across the wall portion 41, and a jaw from the inner surface of the wall portion 41 on both the left and right sides of the jaw portion 42. It is comprised from the flexible latching arm 43 extended in the same direction as the part 42. FIG.

  The slit 41a formed in the wall portion 41 is formed to a size that does not hinder the insertion of the FPC 10. When the FPC 10 is passed through the slit 41a, the vertical and horizontal movements on the end side (connector insertion side) of the FPC 10 are restricted, and the FPC 10 and the contacts 17, 18, It is possible to prevent the relative positional relationship with 25 from deviating.

  The jaw portion 42 is inserted into the elastic space 23 while elastically deforming the pair of elastic pinching pieces 19 of the signal contacts 17 and 18 and the L-shaped elastic piece 26 of the ground contactor 25 outward while being overlapped with the FPC 10. The FPC 10 is pressed against the electrical contact portions 20, 27 of the contacts 17, 18, 25 by the elastic restoring force of the elastic clamping piece 19 and the L-shaped elastic piece 26, and the circuit conductor 12 of the FPC 10 and the contacts 17, 18, 25 It is a part which makes the electrical contact parts 20 and 27 electrically contact (refer FIG. 5, 6). That is, the distance between the elastic spaces 23 of the contacts 17, 18, and 25 that receive the FPC 10 and the jaw part 42 is smaller than the total dimension of the thickness of the jaw part 42 and the thickness of the FPC 10. And the FPC 10 are inserted into the elastic space 23 so that the pair of elastic clamping pieces 19 or the L-shaped elastic piece 26 elastically opens outward with the base side as a fulcrum, and is proportional to the amount of elastic deformation. The circuit conductor 12 of the FPC 10 and the electrical contact portions 20 and 27 of the contacts 17, 18 and 25 are brought into contact with each other by elastic restoring force. The contact pressure between the electrical contact portions 20, 27 of the contacts 17, 18, 25 and the circuit conductor 12 of the FPC 10 is preferably constant in all the contacts 17, 18, 25, and a pair of elastic clamping pieces 19 and the size and shape of the L-shaped elastic piece 26 are determined.

  The locking arm 43 is for locking the slider 40 to the connector housing 30. When the slider 40 is inserted into the rear wall opening 36 of the connector housing 30, the locking arm 43 enters the locking holes 37 formed on the left and right sides of the connector housing 30, and is formed on the distal end side of the locking arm 43. The slider 40 is locked to the connector housing 30 by the hooked portion 43 a engaging with a locking projection (not shown) formed on the inner surface of the locking hole 37. Conversely, when releasing the lock, the pair of locking arms 43 are bent inward to release the engagement between the flange 43a and the locking protrusion, and the slider 40 can be removed from the connector housing 30. It is like that.

  As described above, according to the present embodiment, the signal lines 5 and 6 and the ground line 7 are separately formed on one side and the other side on the surface side of the printed wiring board 2, and face each other. Therefore, the wiring pattern can be simplified and simplified, and the fine pitches of the signal lines 5 and 6 in a limited space can be achieved. Further, since the conductor lengths of the adjacent signal lines 5 and 6 in each pair are equal to each other, the skew value of the differential signal in the pair of signal lines 5 and 6 can be reduced. Further, since the differential signal flow in the pair of signal contacts 17 and 18 is not folded back in a U-turn shape, reflection can be reduced. Therefore, it is possible to improve the high-speed transmission of differential signals, thereby improving the image quality of the digital signal receiver.

  In addition, this invention is not restrict | limited to the said embodiment, It can also implement with another form. For example, the connector 15 of the present embodiment uses two types of contacts 16 and 17 having different overall lengths as signal contacts, but may be one type of contacts having the same overall length. Further, the dimensions of the signal contacts 16 and 17 and the ground contact 25 are arbitrary, and are not limited to specific dimensions. The connector 15 is fixed to the printed wiring board 2 by a shroud 45 as a fixing member. However, the connector 15 can be fixed to the printed wiring board 2 by using a lock mechanism or the like without using the shroud 45.

  Moreover, although FPC10 is used as a circuit body in this embodiment, this invention is not restrict | limited to FPC10, The harness called a flat electric wire, a flexible flat circuit body (FFC), etc. can also be used. It is.

It is a perspective view showing one embodiment of a circuit body connection structure concerning the present invention. It is a top view which shows the printed wiring board shown in FIG. FIG. 2 is an exploded perspective view of the board connector shown in FIG. 1. It is a perspective view which shows a contactor arrangement | sequence. The signal contact in the state accommodated in the board | substrate connector shown in FIG. 1 is shown, (a) is a plus signal contact, (b) is sectional drawing of a minus signal contact. It is sectional drawing which similarly shows the ground contactor in the state accommodated in the board | substrate connector. It is a top view which shows an example of the conventional printed wiring board. The signal contact of the conventional board | substrate connector is shown, (a) is a plus signal contact, (b) is sectional drawing of a minus signal contact.

Explanation of symbols

1 Circuit body connection structure 2 Printed wiring board (wiring board)
5,6 Signal line (wiring conductor)
7 Ground line 10 FPC (circuit body)
15 Board Connector 17, 18 Signal Contact 20, 27 Circuit Body Side Electrical Contact 21, 28 Board Side Electrical Contact 25 Ground Contact 30 Connector Housing 38 Contact Housing 40 Slider 45 Shroud

Claims (5)

A connector housing having a contact housing chamber, and a plurality of contacts housed in the contact housing chamber, and electrically connecting a circuit body and a wiring board having a predetermined pattern wiring structure through the contact For interconnecting board connectors,
The plurality of contacts are a plurality of pairs of signal contacts and a plurality of ground contacts,
The signal contact is a contact for transmitting a differential signal in a state in which a positive signal and a negative signal having opposite phases are synchronized with each other, and one end of the circuit contact is in electrical contact with the conductor portion of the circuit body. A board-side electrical contact portion that is located in the opposite direction to the circuit body-side electrical contact portion and contacts the conductor portion of the wiring board at the other end,
The ground contact has a circuit body-side electrical contact portion that is in electrical contact with the conductor portion of the circuit body at one end, and is positioned in the same direction as the circuit body-side electrical contact portion at the other end. A substrate-side electrical contact portion that comes into contact with the portion,
A board connector characterized in that the board-side electrical contact portions of both contacts are located on opposite sides of each other.   The board connector according to claim 1, wherein the ground contact is disposed outside each pair of the signal contacts. The substrate for a substrate according to claim 1 or 2, wherein the substrate is used for electrically connecting the wiring substrate having a signal line and a ground line on at least one plate surface of the insulating substrate and the circuit substrate. A circuit body connection structure comprising a connector,
A plurality of pairs of the signal lines that are in electrical contact with the board-side electrical contact portions of the signal contacts housed in the board connector are positioned on the front side of the board connector fixed to the plate surface of the wiring board. The ground line electrically connected to the board-side electrical contact portion of the ground contact housed in the board connector is located on the rear side of the board connector, and the signal line and the ground line are A circuit body connection structure characterized by facing each other.   4. The circuit body connection structure according to claim 3, wherein conductor lengths of adjacent signal lines of each pair are equal to each other.   The circuit body connection structure according to claim 3, wherein the circuit body is a flexible printed circuit.

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