JP2012219646A - Terminal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure that ensures sealing between a terminal and a resin member only with a rubber member arranged between the terminal and the resin member.SOLUTION: A terminal structure comprises: a plurality of terminals 2; a resin member 3 with the terminals 2 embedded therein; and a rubber member 4 which is arranged between the terminal 2 and the resin member 3 and compressed to be adhered around the terminal 2 for sealing a gap between the terminal 2 and the resin member 3. The resin member 3 is formed by inserting a jig J2 into a jig insertion space 4d of an inter-terminal rubber part 4a and injecting a fused resin while applying a compression load in a width direction. The fused resin is also injected into a resin space 4e which is formed in the inter-terminal rubber part 4a. The compression load can be applied easily to the inter-terminal rubber part 4a and the gap between the terminal and the rubber member can be sealed in the inter-terminal rubber part 4a, thereby ensuring sealing between the terminal and the resin member only with the rubber member 4.

Description

  The present invention relates to a terminal structure including a terminal and a molding resin for embedding the terminal, and more particularly to a terminal structure applied to a connector of an injector.

Conventionally, there is a terminal structure for fixing a terminal by resin molding (see Patent Document 1). In addition, since the terminal structure mounted on the vehicle injector is placed in an environment where oil may adhere, it is necessary to seal between the terminal and the resin.
Therefore, as shown in FIG. 6, a technique is known in which a rubber member 104 is interposed between the terminal 102 and the resin member 103 to seal between the terminal 102 and the resin member 103.

Specifically, a rubber member is applied to the terminal 102 by applying a compression load using a jig (not shown) from an outer surface substantially parallel to the axial direction of the terminal 102 of the rubber member 104 into which the plurality of terminals 102 are inserted. The resin member 103 is formed by pouring the molten resin around the rubber member 104 with the 104 pressed, and removing the jig to release the compressive load on the outer surface when the molten resin is solidified.
According to this, since the rubber member 104 tries to recover after the compression load is released, the rubber member 104 comes into close contact with the terminal 102 and the resin member 103, and between the terminal 102 and the rubber member 104, and between the rubber member 104 and the resin. The gap between the members 103 is sealed, and as a result, the seal between the terminal 102 and the resin member 103 is secured by the rubber member 104.

However, in this terminal structure, since a compressive load cannot be applied to the portion of the rubber member 104 between the adjacent terminals 102 (inter-terminal rubber portion 104a), the terminal side surface 102h on the adjacent terminal 102 side The seal between 102 and the rubber member 104 becomes insufficient.
For this reason, the seal with the rubber member 104 on the terminal side surface 102h is secured by an adhesive.

  However, in securing a seal with an adhesive, it is difficult to ensure a sufficient sealing performance in the long term because there is thermal degradation of the adhesive. That is, it is difficult to guarantee the reliability of the seal.

JP 2010-256213 A

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a terminal structure that ensures a seal between a terminal and a resin member only by a rubber member.

[Means of Claim 1]
The terminal structure according to claim 1 is arranged between a plurality of terminals (2), a resin member (3) in which the terminal (2) is embedded, and the terminal (2) and the resin member (3), A rubber member (4) is provided that is in close contact with the periphery of the terminal (2) by being compressed and seals between the terminal (2) and the resin member (3).
The resin member (3) is molded integrally with the terminal (2) and the rubber member (4) by injecting molten resin around the rubber member (4) in which the terminal (2) is inserted. ing.

  Further, if the direction in which adjacent terminals (2) are arranged in the width direction is the width direction, the rubber member (4) is a portion of the rubber member (4) between the adjacent terminals (2) (hereinafter referred to as inter-terminal rubber portion ( 4b)), a jig insertion space (4a) for applying a compressive load in the width direction by inserting the jig (J2a) and a resin space (4e) into which a part of the molten resin enters. Have.

  Then, with the jig (J2a) being inserted into the jig insertion space (4d), a compression load in the width direction is applied to the rubber part (4a) between the terminals, and around the rubber member (4) and The resin member (3) is formed by injecting molten resin into the resin space (4e).

  According to this, a compressive load in the width direction can be applied to the inter-terminal rubber portion (4a) by the jig (J2a), and the rubber member (4) is transferred to the terminal (2) in the inter-terminal rubber portion (4a). Can be pressed. And after releasing the compressive load by a jig | tool (J2a) after molten resin solidifies, the compression state of the rubber part (4a) between terminals can be maintained with the resin part solidified within the resin space (4e). .

That is, a compressive load can be easily applied to the inter-terminal rubber part (4a), and the terminal-rubber member can be sealed also in the inter-terminal rubber part (4a).
That is, it is not necessary to ensure the sealing property with the adhesive, and the seal between the terminal and the resin member can be ensured only by the rubber member (4).

[Means of claim 2]
According to the means described in claim 2, the terminal structure described in claim 1 is applied to an injector.
That is, it is used as a terminal structure of an injector having a needle for opening and closing the nozzle hole, an actuator for opening and closing the needle, and a drive terminal (2, 2A) connected to the actuator.

  The injector is often used in an environment where oil may adhere, and the terminal structure used for the injector needs to ensure sufficient sealing performance. According to this means, as described above, the sealability of the terminal structure can be sufficiently ensured only by the rubber member (4).

[Means of claim 3]
According to the means described in claim 3, the terminal structure described in claim 1 is applied to a fuel injection device including a pressure sensor (11).
That is, an injector (10) having a needle for opening and closing the nozzle hole, an actuator for opening and closing the needle, and a drive terminal (2, 2A) connected to the actuator, and a fuel pressure in the injector (10) are detected. Used as a terminal structure of a fuel injection device (12) including a pressure sensor (11) that performs and a sensor terminal (2, 2S) that is connected to the pressure sensor (11).

  The fuel injection device is often used in an environment where oil may adhere. In order to prevent oil from entering the IC mounted on the pressure sensor (11), the fuel injection device having the pressure sensor (11) particularly needs to ensure sufficient sealing performance. According to this means, as described above, the sealability of the terminal structure can be sufficiently ensured only by the rubber member (4).

[Means of claim 4]
According to the terminal structure of claim 4, when the direction in which the terminal (2) protrudes is the axial direction, the jig insertion space (4d) extends in a direction perpendicular to the axial direction and perpendicular to the width direction. The resin space (4e) is formed on both the one end side and the other end side in the axial direction of the jig insertion space (4d).

As described above, the compression state of the inter-terminal rubber part (4a) is maintained by the resin part solidified in the resin space (4e).
For this reason, when the resin space (4e) is formed on either one of the axial direction one end side or the other end side of the jig insertion space (4d), on the side where the resin space (4e) is not formed. The compression state of the rubber part (4a) between the terminals may be insufficient.
On the other hand, when the resin space (4e) is formed on both the one end side and the other end side in the axial direction of the jig insertion space (4d) as in this means, the compression of the inter-terminal rubber portion (4a) is performed. It becomes easy to maintain the state.

(Example 1) which is a fragmentary sectional view of a fuel-injection apparatus. (A) is a front view of a terminal structure, (b) is AA sectional drawing of (a) (Example 1). (A) is AA sectional drawing of Fig.2 (a) at the time of resin molding, (b) is explanatory drawing explaining a jig | tool and jig insertion space, (c) is B of (a). It is -B sectional drawing. It is sectional drawing which shows the state which removed the jig | tool after resin molding (Example 1). (Example 2) which is explanatory drawing explaining the other aspect of a jig | tool. (A) is sectional drawing of a terminal structure, (b) is AA sectional drawing of (a) (conventional example).

A terminal structure according to an embodiment of the present invention is arranged between a plurality of terminals (2), a resin member (3) in which the terminal (2) is embedded, and the terminal (2) and the resin member (3). And a rubber member (4) that is in close contact with the periphery of the terminal (2) by being compressed and seals between the terminal (2) and the resin member (3).
The resin member (3) is molded integrally with the terminal (2) and the rubber member (4) by injecting molten resin around the rubber member (4) in which the terminal (2) is inserted. ing.

  Further, if the direction in which adjacent terminals (2) are arranged in the width direction is the width direction, the rubber member (4) is a portion of the rubber member (4) between the adjacent terminals (2) (hereinafter referred to as inter-terminal rubber portion ( 4a)), a jig insertion space (4d) for applying a compressive load in the width direction by inserting the jig (J2a) and a resin space (4e) into which a part of the molten resin enters. Have.

  Then, by inserting a jig (J2a) into the jig insertion space (4d), a compression load in the width direction is applied to the rubber part (4a) between the terminals. The resin member (3) is formed by injecting molten resin into the resin space (4e).

[Configuration of Example 1]
The configuration of the first embodiment will be described with reference to FIGS.
The terminal structure of the first embodiment is provided as a terminal assembly 1 that holds a plurality of terminals.
The terminal assembly 1 includes a plurality of terminals 2, a resin member 3 in which the terminal 2 is embedded, and a rubber member that is disposed between the terminal 2 and the resin member 3 and seals between the terminal 2 and the resin member 3. 4 (see FIG. 2).

  The terminal structure of the present embodiment is applied to a fuel injection device 12 that includes an injector 10 and a pressure sensor 11 that detects the fuel pressure in the injector 10 (see FIG. 1).

The injector 10 receives high-pressure fuel from a fuel supply source and injects the fuel into each cylinder of the engine. The injector 10 opens and closes a nozzle hole (not shown), and an actuator for opening and closing the needle (see FIG. (Not shown).
The injector 10 includes a drive terminal 2A that supplies power to an actuator (for example, a piezoelectric actuator). For example, the drive terminal 2A includes two terminals 2 connected to positive and negative lead wires 14 connected to an actuator.

  The pressure sensor 11 detects the pressure of high-pressure fuel introduced into the injector 10 from a fuel supply source, for example, and is assembled to the body of the injector 10. The details of the configuration of the pressure sensor 11 are also disclosed in Patent Document 1, but an outline of the configuration of the pressure sensor 11 is described below.

The pressure sensor 11 includes a stem 16, a sensor chip 17, a mold IC 18 and the like.
The stem 16 has a hollow portion 16a into which high-pressure fuel is introduced, and a diaphragm 16b that deforms according to the pressure introduced into the hollow portion 16a.
The sensor chip 17 has a pressure-sensitive element that outputs in accordance with the deformation of the diaphragm 16b.
The mold IC 18 is formed by resin-molding a circuit board having a circuit for processing a signal detected by the sensor chip 17 and a circuit for applying a driving voltage to the sensor chip 17.

  The mold IC 18 is provided with an output terminal that processes and outputs a signal from the sensor chip 17, and a terminal connected to the terminal of the mold IC 18 is referred to as a sensor terminal 2S. For example, the sensor terminal 2 </ b> S includes three terminals 2.

  The drive terminal 2A and the sensor terminal 2S are provided in the connector housing 20 of the injector 10. That is, the drive terminal 2A, the sensor terminal 2S, and the one connector housing 20 constitute a connector of the fuel injection device 12.

Specifically, the drive terminal 2 </ b> A, the sensor terminal 2 </ b> S, and one GND terminal (not shown) are arranged in one connector housing 20.
The sensor terminal 2S is provided in one terminal assembly 1, the drive terminal 2A and the GND terminal 2 are provided in another one terminal assembly 1, and the two terminal assemblies 1 are provided in the connector housing 20. They are arranged side by side.
The connector housing 20 is formed by secondary resin molding in a state where the terminal assembly 1 is arranged at a predetermined position. The connector housing 20 has a recess 20a into which a mating connector (not shown) is fitted, and the tip of the terminal 2 protrudes from the bottom surface of the recess 20a toward the opening side.

The terminal structure of the present embodiment is applied to the terminal structure of the fuel injection device 12 having the driving terminal 2A and the sensor terminal 2S.
Below, the characteristic of the terminal structure of a present Example is demonstrated.

[Features of this embodiment]
A detailed description will be given of a terminal structure with three terminals 2 as an example with reference to FIGS.

The three terminals 2 are embedded in the resin member 3 to constitute one assembly (terminal assembly 1).
A rubber member 4 is interposed between the terminal 2 and the resin member 3.

That is, the rubber member 4 is formed with terminal insertion holes 4b into which the terminals 2 are inserted. The terminals 2 are inserted into the terminal insertion holes 4b, and the terminals 2 are held by the rubber member 4.
Here, if the direction in which the terminal 2 protrudes is defined as the axial direction, the terminal 2 is disposed in the terminal insertion hole 4b so as to protrude from both axial end surfaces of the rubber member 4.

The three terminals 2 are lined up in a row and are held by the rubber member 4 so as to protrude in the same direction (see FIGS. 2A and 2B).
Here, the direction in which adjacent terminals 2 are arranged is defined as the width direction. The axial direction and the width direction are orthogonal to each other.

  A space for applying a compressive load in the width direction by inserting a jig J2 (described in detail later) into a portion of the rubber member 4 between the adjacent terminals 2 (hereinafter referred to as the inter-terminal rubber portion 4a). And a resin space 4e which is a space for injecting a part of the molten resin into the inter-terminal rubber portion 4a.

  The jig insertion space 4d is provided as a hole penetrating in the depth direction in the central portion in the axial direction of the inter-terminal rubber portion 4a. The depth direction is a direction perpendicular to the width direction and perpendicular to the axial direction. That is, the jig insertion space 4 d is formed so as to open on both side surfaces 4 g in the depth direction of the rubber member 4.

  The resin space 4e is provided at one end side and the other end side in the axial direction of the jig insertion space 4d so as to communicate with the jig insertion space 4d and to open at both axial end surfaces of the rubber member 4. That is, the resin space 4e is formed as a passage that extends from the central portion in the width direction of the inter-terminal rubber portion 4a to both ends in the axial direction and opens to both end surfaces in the axial direction of the rubber member 4.

  In the present embodiment, since the jig insertion space 4d and the resin space 4e are provided in the above-described manner, the rubber member 4 includes three pieces each having one terminal 2 inserted therein by the jig insertion space 4d and the resin space 4e. It is divided into (4X, 4Y, 4Z).

  In other words, the rubber member 4 is divided into three pieces (4X, 4Y, 4Z), the terminal 2 is inserted into each piece, and a gap C in the width direction is formed between the pieces. . The gap C extends in the width direction at the central portion in the axial direction, and the widened portion is used as the jig insertion space 4d, and the gap C on one end side and the other end side in the axial direction of the jig insertion space 4d. Used as the resin space 4e (see FIG. 2A).

  The resin member 3 is formed by insert molding with a rubber member 4 into which the terminal 2 is inserted, covering the rubber member 4 and a part of the terminal 2 protruding from the other axial end surface of the rubber member 4. Yes. Note that one end surface 4 c in the axial direction of the rubber member 4 is exposed from the resin member 3.

  The terminal assembly 1 is arranged on the connector housing 20 so that one end side in the axial direction of the terminal 2 is in a protruding direction toward the opening side of the connector housing 20 (see FIG. 1).

[Method of manufacturing the terminal assembly 1 of this embodiment]
First, with a plurality of terminals 2 inserted into the rubber member 4, a compressive load is applied by a jig from the outer surface of the rubber member 4 substantially parallel to the axial direction (see FIGS. 3A and 3C).
That is, the jig J1 is pressed against both side surfaces 4f in the width direction of the rubber member 4, and a load is applied toward the center in the width direction. Thereby, the rubber member 4 is deformed and brought into close contact with the side surface 2f on the outer side in the width direction of the terminals 2 arranged on the outer side in the width direction.
Further, the jig J2 is pressed against both side surfaces 4g in the direction perpendicular to the width direction (depth direction), and a load is applied toward the center in the depth direction. As a result, the rubber member 4 is deformed and brought into close contact with the side surface 2g of the terminal 2 in the depth direction.

Further, one of the jigs J2 has a comb shape having a convex portion J2a protruding in the depth direction, and the jig J2 presses against both side surfaces 4g to push the rubber member 4 into the side surface 2g in the depth direction of the terminal 2. At the same time, the protrusion J2a is inserted into the jig insertion space 4d, thereby pressing the inter-terminal rubber portion 4a against the side surface 2h of the terminal 2 on the adjacent terminal 2 side.
That is, the length j in the width direction of the jig insertion space 4d before the protrusion J2a is inserted is smaller than the length k in the width direction of the protrusion J2a (see FIG. 3B), and the protrusion J2a Is inserted into the jig insertion space 4d, so that the rubber member 4 is deformed so that the jig insertion space 4d expands in the width direction.
As a result, the rubber member 4 is deformed and brought into close contact with the side surface 2h of the terminal 2 on the adjacent terminal 2 side.

  Next, in a state where a compression load is applied to the rubber member 4 by the jigs J1 and J2, molten resin is injected into the mold around the rubber member 4 (see FIGS. 3A and 3C). The molten resin also enters the resin space 4e. When the molten resin is solidified, the jigs J1 and J2 are removed, and the compressive load on the rubber member 4 is released (see FIG. 4). Thereby, the resin member 3 is formed.

According to this, since the molten resin around the resin space 4e and the rubber member 4 is solidified in a state in which the compression load is applied by the jigs J1 and J2, the rubber member 4 after releasing the compression load is restored by a restoring force to be restored. The rubber member 4 is in a state of being in close contact with the side surfaces 2f, 2g, and 2h of the terminal 2 (in a state of being substantially in airtight contact) and in a state of being in close contact with the resin member 3 (see FIG. 4).
For this reason, the space between the terminal and the rubber member is sealed. That is, the space between the terminal and the resin member is sealed by the rubber member 4.

  In addition, molten resin is poured so that the axial direction one end surface 4c of the rubber member 4 may be exposed. Further, since the resin member 3 is formed by pouring the molten resin while pressing the rubber member 4 with the jigs J1 and J2, the resin member 3 has a hole (healing) where the jigs J1 and J2 are arranged. It is formed as a tool window 3a) (see FIGS. 2 and 3).

[Effect of Example 1]
In the terminal structure of the present embodiment, a resin member 3 is injected by injecting molten resin into a mold in a state where a jig J2 is inserted into the jig insertion space 4d of the inter-terminal rubber portion 4a and a compressive load is applied in the width direction. Is formed. At this time, the molten resin is also injected into the resin space 4e formed in the inter-terminal rubber portion 4a.

  According to this, a compressive load in the width direction can be applied to the inter-terminal rubber portion 4a by the jig J2 (convex portion J2a), and the rubber member 4 can be pressed against the terminal 2 in the inter-terminal rubber portion 4a. And the state compressed by solidification of the molten resin in the resin space 4e can be maintained.

That is, a compressive load can be easily applied to the inter-terminal rubber portion 4a, and the terminal-rubber member can be sealed also in the inter-terminal rubber portion 4a.
That is, it is not necessary to secure the sealing property with the adhesive, and the seal between the terminal and the resin member can be ensured only by the rubber member 4.

For this reason, even if oil or a foreign substance tries to enter from the opening of the connector housing 20, the rubber member 4 ensures the seal between the terminal and the resin member, so that the entry can be prevented.
And since the sealing performance is ensured by the rubber member 4 instead of the sealing performance by the adhesive as in the prior art, it is easy to guarantee the reliability of the seal.

  In the terminal structure of the present embodiment, the jig insertion space 4d extends in a direction perpendicular to the axial direction and perpendicular to the width direction (that is, the depth direction), and the resin space 4e is formed from the jig insertion space 4d. It is formed on both the one end side and the other end side in the axial direction.

As described above, the compression state of the inter-terminal rubber portion 4a is maintained by the resin portion solidified in the resin space 4e.
For this reason, when the resin space 4e is formed on either the one end side or the other end side in the axial direction of the jig insertion space 4d, the inter-terminal rubber portion 4a is formed on the side where the resin space 4e is not formed. The compressed state may not be maintained sufficiently.
On the other hand, in the present embodiment, the resin space 4e is formed on both the one end side and the other end side in the axial direction of the jig insertion space 4d. Therefore, it is easy to maintain the compressed state of the inter-terminal rubber portion 4a.

Further, the terminal structure of this embodiment is applied to the terminal assembly 1 used in the fuel injection device 12.
The fuel injection device 12 is often used in an environment where oil may adhere. Further, in order to prevent oil intrusion into the circuit board of the mold IC 18 mounted on the pressure sensor 11, it is particularly necessary to ensure sufficient sealing performance in the fuel injection device having the pressure sensor 11.
According to the present embodiment, as described above, it is possible to sufficiently ensure the sealing performance of the terminal structure only by the rubber member 4, and it is possible to prevent the oil penetration of the mold IC 18 into the circuit board.

[Example 2]
The configuration of the second embodiment will be described with reference to FIG. 5 with a focus on differences from the first embodiment.
In the present embodiment, a convex portion J2a is provided on one side of the jig J2, and a concave portion J2b with which the convex portion J2a is engaged is formed on the other side of the jig J2.
This shows one mode of the jig J2.

[Modification]
In the first embodiment, the axial end surface 4 c of the rubber member 4 is exposed from the resin member 3, but the axial end surface 4 c may be covered with the resin member 3.

  Moreover, in Example 1, although the rubber member 4 was divided | segmented into three pieces (4X, 4Y, 4Z), it does not need to be divided | segmented. That is, three pieces may be connected. For example, the resin space 4e is provided only on one end side or the other end side in the axial direction of the jig insertion space 4d, and three pieces are connected on the other end side or one end side in the axial direction of the jig insertion space 4d. But you can. Further, the three pieces may be connected at any position in the depth direction on the outer side in the axial direction of the jig insertion space 4d.

  Moreover, although Example 1-3 demonstrated as a terminal structure used for the fuel-injection apparatus 12 which has the injector 10 and the pressure sensor 11, the terminal structure used for the injector 10 may be sufficient.

  In the fuel injection devices 12 of the first to third embodiments, the pressure sensor 11 is integrally incorporated in the body of the injector 10. However, the present invention is not limited thereto. ) Only may be integrated into the body of the injector 10.

  Moreover, although Example 1-3 demonstrated as a terminal structure used for the fuel-injection apparatus 12 which has the injector 10 and the pressure sensor 11, it is not restricted to this, For example, it is provided in the injector 10 and the fuel which detects the temperature of fuel is detected. You may apply to a temperature sensor etc. Further, a storage memory provided in the injector 10 for storing the characteristics of the injector 10 in advance, or a storage memory provided in the injector 10 for temporarily storing signals from the pressure sensor, the fuel temperature sensor, etc. You may apply to a terminal structure. Moreover, you may apply the terminal structure of this invention not only for fuel injection apparatuses but to the electronic components used for another apparatus.

DESCRIPTION OF SYMBOLS 1 Terminal assembly 2 Terminal 2A Drive terminal 2S Sensor terminal 3 Resin member 4 Rubber member 4a Terminal rubber part 4d Jig insertion space 4e Resin space 10 Injector 11 Pressure sensor 12 Fuel injection device J2 Jig J2a Convex part (jig )

Claims (4)

Multiple terminals (2);
A resin member (3) for embedding the terminal (2);
The terminal (2) and the resin member (3) are arranged between the terminal (2) and the resin member (3) in close contact with the periphery of the terminal (2) by being compressed. A rubber member (4) for sealing between,
The resin member (3) is integrated with the terminal (2) and the rubber member (4) by injecting molten resin around the rubber member (4) in which the terminal (2) is inserted. A terminal structure molded into
If the direction in which the adjacent terminals (2) are lined up is the width direction,
The rubber member (4) is formed by inserting a jig into a portion of the rubber member (4) between the adjacent terminals (2) (hereinafter referred to as an inter-terminal rubber portion (4a)). A jig insertion space (4d) for applying a compressive load in the width direction, and a resin space (4e) into which a part of the molten resin enters,
When the jig (J2a) is inserted into the jig insertion space (4d), a compression load in the width direction is applied to the rubber portion (4a) between the terminals, and the rubber member (4) The terminal structure, wherein the resin member (3) is formed by injecting molten resin into the periphery and the resin space (4e). The terminal structure according to claim 1,
This terminal structure
A terminal structure used for an injector having a needle for opening and closing a nozzle hole, an actuator for opening and closing the needle, and a drive terminal (2) connected to the actuator. The terminal structure according to claim 1,
This terminal structure
An injector (10) including a needle for opening and closing the nozzle hole, an actuator for opening and closing the needle, and a drive terminal (2, 2A) connected to the actuator;
A pressure sensor (11) for detecting a fuel pressure in the injector (10);
A terminal structure used for a fuel injection device (12) comprising a sensor terminal (2, 2S) connected to the pressure sensor (11). In the terminal structure according to any one of claims 1 to 3,
When the direction in which the terminal (2) protrudes is an axial direction,
The jig insertion space (4d) extends in a direction perpendicular to the axial direction and perpendicular to the width direction,
The terminal structure characterized in that the resin space (4e) is formed on both the one end side and the other end side in the axial direction of the jig insertion space (4d).

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