JP5323390B2 - Connection structure - Google Patents

Description

  The present invention relates to a connection structure for connecting, for example, an electronic component used in a vehicle lighting device or a control device to an electric cable such as a flat cable.

  Conventionally, as a structure and method for connecting an electronic component such as an LED lamp and an electric cable such as a flat cable, the connection structure and connection method of the LED lamp and the flat cable of Patent Document 1 have been proposed (Patent Document). 1).

  In this connection structure and connection method, for example, a connection tab portion provided in a lead portion of an LED lamp is overlapped at a position corresponding to a flat conductor of a flat cable, and a piercing piece of a connector straddling the connection tab portion is flattened. The part that penetrates and penetrates the conductor is curled inward and connected.

However, since the LED lamp and the flat cable are fixed by inserting the piercing piece of the connector into the flat conductor of the flat cable, for example, when an external force in the longitudinal direction is applied to the flat cable due to deformation or extension. In addition, an external force may affect the connection portion between the flat conductor of the flat cable and the piercing piece of the connector, and the electrical connection state may become unstable.
Japanese Patent Laid-Open No. 2005-50986

  An object of this invention is to provide the connection structure which can improve connection reliability.

The present invention includes a connection terminal for electrically connecting the electronic component to an electrical cable in contact with one contact disposed facing the electronic component, a first box-body inserted the electronic component及beauty before Symbol connecting terminal And a second box which is fitted to the bottom surface of the first box so as to sandwich the electric cable, and the connecting terminal is restrained in the longitudinal direction with respect to the electric cable. A plurality of flat conductors, each having a connecting portion that is connected in a state where the electric cable is disposed at a predetermined interval in the width direction, and a covering member that integrally covers the plurality of flat conductors. In the state which comprises a flat cable, and forms a hooking part which is eccentric in the thickness direction in a part of the longitudinal direction of the flat cable, and the connection part is inserted in the first box The bottom of the first box The flat conductor of the flat cable protruding position constituted by a through connecting portion connecting through in the thickness direction, in at least one of the opposing surfaces of the first box-body and the second box-body, engagement of the engaging portion A hook projecting piece projecting downward at both ends in the longitudinal direction of the first box, and a portion corresponding to the connection terminal on the upper surface of the second box, An avoiding recess for preventing the penetration connecting portion penetrating the flat cable in the thickness direction is provided, and the front side and the rear side of the opposite side surfaces in the width direction of the first box and the second box are mutually connected. An engaging means comprising an engaging portion to be engaged and an engaged portion; and the engaging means is disposed at a position on the outer side in the longitudinal direction in the longitudinal direction from the connecting portion, and the flat cable At the front and rear ends of the hooked part or hooked part The pair of formed bent portions are arranged at positions outside the engaging portion of the engaging means in the front-rear direction, the engaging portion is engaged with the engaged portion, and the longitudinal direction of the second box is The hooking portion is sandwiched between both side surfaces and the upper surface, and the bottom surface of the first box and the inside of the flange projecting piece, and the engaging means is engaged to form the first box and the second box. When the first box and the second box are fitted, the hooking portion of the flat cable is the through-connection portion of the connection terminal inserted into the first box. The flat conductor is penetrated in the thickness direction to electrically connect the electronic component and the flat cable.

The electronic component includes a light source device such as an LED chip, various sensors, a resistor for adjusting a supply voltage, and a diode constituting a bypass circuit when a high voltage is applied.
The connection terminal includes a terminal such as a pierce terminal that directly connects an electronic component to an electric cable.

The first box includes a device holder that is allowed to be assembled with an electronic device such as an LED chip or a resistor, and is formed in a rectangular parallelepiped shape having an open top surface.
The second box is formed in a size and shape that matches the bottom surface of the device holder that is the first box, and is fitted to the bottom surface of the device holder so as to sandwich an electric cable such as a flat cable. Including being an under holder.

In addition, although the ribbon electric wire which arranged and integrated the round strand wire in the width direction may be used as an electric cable, the flat cable with a high heat dissipation effect is more preferable.
Also, the position outside in the front-rear direction is a position where all of the engaging means are outside the connecting portion in the longitudinal direction of the electric cable, or the connecting portion and the engaging means overlap in the longitudinal direction, and the remaining one This is the position where the part is on the outside.

  According to this invention, even if an external force is applied to the electric cable, the external force does not affect the connection portion between the connection terminal and the electric cable, and the connection reliability is improved.

  As shown in FIGS. 1 to 7, the LED module 1 of the present invention is in contact with one side contact 32a, 41a on one side of contacts 32, 41 arranged opposite to each other in the electronic device 3 (LED chip 30, resistor 40). The connection terminal 6 for electrically connecting the electronic device 3 to the flat cable 100, the device holder 7 for inserting the connection terminal 6, and the flat cable 100 are fitted to the bottom surface of the device holder 7. The connecting holder 6 has a piercing blade 63b that penetrates and connects to the conductor 101 of the flat cable 100.

  The flat cable 100 includes two conductors 101 and a non-conductive laminate sheet 102 that covers the conductors 101, and is eccentric in the thickness direction H at a part in the longitudinal direction L of the flat cable 100. A hooking portion 110 is formed.

  A hooking groove 91 that allows the hooking portion 110 to be hooked is provided on the upper surface of the underholder 9 that faces the bottom surface of the device holder 7.

  Further, convex engaging claws 7a, 7b and concave engaged portions 93a, which are engaged with each other on the front side and the rear side of the opposite side surfaces in the width direction W of the device holder 7 and the under holder 9, respectively. 93b. Further, the engaging claws 7 a and 7 b and the engaged portions 93 a and 93 b are arranged at positions on the outer side in the longitudinal direction L from the piercing blade 63 b of the connection terminal 6 protruding from the bottom surface of the device holder 7.

  The configuration of the LED module 1 described above will be described in detail with reference to FIGS. 1 shows a perspective view of the LED module 1, FIG. 2 shows a bottom view of the LED module 1, FIG. 3 shows a cross-sectional view of the LED module taken along line AA, and FIG. FIG. 5 shows an exploded perspective view, FIG. 5 shows a perspective view of the assembly of the device holder 7 to which the intermediate terminal 5 and the connection terminal 6 are assembled, the under holder 9 and the flat cable 100, and FIG. 6 shows the intermediate terminal. 5 and FIG. 7 are explanatory views showing perspective views of the assembly of the device holder 7 to which the connection terminal 6 and the connection terminal 6 are assembled and the under holder 9 to which the flat cable 100 is inserted, and FIG. 7 shows a piercing blade 63b of the connection terminal 6; Explanatory drawing about the positional relationship between the engaging claws 7a and 7b of the device holder 7 and the bent portions 100a and 100b of the flat cable 100 is shown. To have.

  As shown in FIG. 4, the LED module 1 is a connection unit that connects the electronic device 3 including the LED chip 30 and the resistor 40 inserted into the device holder 7 to the flat cable 100.

  That is, the device holder 7 which is the first box, the LED chip 30 and the resistor 40 which are inserted into the device holder 7, and the connection terminal 6 (6a, 6) which connects the LED chip 30 and the resistor 40 to the flat cable 100. 6b), an intermediate terminal 5 that fixes the LED chip 30 and the resistor 40, a cover member 2 that covers the intermediate terminal 5 from above, and an under holder 9 that is a second box.

  The cover member 2 includes a cover body 2a having a vertically long rectangular shape in plan view formed of a resin plate, and both ends of the cover body 2a in the longitudinal direction L (hereinafter simply referred to as “longitudinal direction”) of the flat cable 100. And an engaging claw portion 2b that engages with the upper surface flange of the device holder 7, and the LED chip 30, the resistor 40, the intermediate terminal 5, and the connection terminal 6 assembled to the device holder 7 from above. The device holder 7 is assembled from above so as to cover it.

  Further, in the center of the cover main body 2a in the width direction W (hereinafter simply referred to as “width direction”) of the flat cable 100, the cover main body 2a is inserted into the inside when the cover is fitted to the cover fitting portion 70A. A circular window 21 having a circular shape in a plan view is provided so that the light emitting portion 31 of the attached LED chip 30 can be visually recognized from the outside.

  The electronic device 3 includes an LED 30 serving as a light source and a resistor 40 that forms a voltage adjustment circuit that adjusts a voltage applied from the outside of the LED module 1 to a predetermined voltage in accordance with the characteristics of the LED 30. In addition, LED30 is about 1-2 mm square whose height is low with respect to the length of the width direction W (the same direction as the width direction of the flat cable 100) and the longitudinal direction L (the same direction as the length direction of the flat cable 100). It is formed in a substantially rectangular parallelepiped.

  The LED 30 includes a light emitting portion 31 having a circular shape in plan view on the upper surface, and L-shaped contacts 32 continuous from the bottom surface on opposite side surfaces in the width direction W. In addition, among the contacts 32, the left back side in FIG. 4 is defined as one side contact 32a, and the right front side is defined as the other side contact 32b.

  The resistor 40 has a thin rectangular parallelepiped shape that is wider than the LED 30, has the same depth, and has a height of about ¼, and is long in the width direction W. The contact 41 is provided continuously. Of the contacts 41, the left rear side in FIG. 4 is a first contact 41a, and the right front side is a second contact 41b.

  The LED 30 and the resistor 40 having such a configuration are arranged along the longitudinal direction L of the flat cable 100, the resistor 40 on the front side in FIG. 4, the LED 30 on the back side, and the opposing contacts 32a and 32b and the contact 41a. , 41b are arranged in the width direction W.

  The intermediate terminal 5 is formed of one copper alloy plate having appropriate elasticity. Specifically, by pressing, the component arrangement openings 55a and 55b in which the LEDs 30 and the resistors 40 are arranged are punched out, and three main springs 51 in the width direction W arranged in the longitudinal direction L at a predetermined interval; It is formed in the shape of a Japanese character in a plan view composed of two parallel longitudinal frames 53 (53a, 53b) in the longitudinal direction L that connect the end portions of the three main springs 51.

  The main spring 51 includes an amplitude part 51a formed in a sine curve shape in the height direction in the vicinity of the center in the width direction W, and constitutes a spring by a biasing force in the width direction W by the amplitude part 51a.

  Of the two longitudinal frames 53 in the longitudinal direction L that connect the ends of the three main springs 51, the side surface on the component arrangement opening 55a, 55b side of the other longitudinal frame 53b on the right front side in FIG. Further, a reverse U-shaped terminal contact portion 52 in contact with the other side contacts 32b and 41b of the LED 30 and the resistor 40 is provided.

  The terminal contact portion 52 is formed in a one-side support state in which the component arrangement openings 55a and 55b side are free and the longitudinal frame 53 side is fixed to the side surface of the longitudinal frame 53, and by the urging force in the width direction W due to the inverted U-shape. It constitutes a spring. In the present embodiment, the intermediate terminal 5 is made of a copper alloy, but may be other than a metal member as long as it has conductivity.

  The device holder 7 is a holder formed in a rectangular parallelepiped shape with an open top surface for inserting and fixing the electronic device 3, the intermediate terminal 5, and the connection terminal 6. As shown in FIGS. A cover fitting portion 70A to which the cover member 2 is fitted is formed in the open portion over both side surfaces and the upper surface in the longitudinal direction L.

  Further, on the rear side of both side surfaces in the width direction W, engaging claws 7a that are engaged with the engaged portions 93a of the under holder 9 are formed. Further, on the front side of both side surfaces in the width direction W, engaging claws 7b that are engaged with the engaged portions 93b of the under holder 9 are formed. Moreover, the collar part protrusion piece 7c which protrudes below is formed in the center lower end of both the collar surfaces of a longitudinal direction. Further, the pair of engaging claws 7 a and 7 b are arranged at a position outside in the longitudinal direction L from the piercing blade 63 b of the connection terminal 6 protruding from the bottom surface of the device holder 7.

  The bottom surface of the device holder 7 is formed in a size and shape that matches the top surface of the under holder 9.

  A device insertion recess 70 for inserting and fixing the electronic device 3 and the intermediate terminal 5 is formed in the center in the width direction W of the upper surface inside the cover insertion portion 70A. Moreover, the connection terminal insertion recessed part 79 which inserts and fixes the connection terminal 6 is provided in the bottom face.

  The device insertion recess 70 is formed to be slightly larger than the planar shape of the intermediate terminal 5 so that the intermediate terminal 5 can be inserted from above, and the enclosure block 71 (71a) is formed in a portion corresponding to the component arrangement openings 55a and 55b. , 71b). Therefore, the intermediate terminal 5 inserted by fitting the component arrangement openings 55a and 55b and the surrounding block 71 can substantially fix the horizontal direction in the device insertion recess 70.

  The enclosure block 71 surrounds the side of the electronic device 3 to be inserted inside in plan view from three directions, and is formed in a U shape having a square configuration with the right front side opened in FIG. In addition, a through hole 72 that allows the connection plate 61 of the connection terminal 6 inserted into the connection terminal insertion recess 79 on the bottom surface side of the device holder 7 to be inserted is provided in the bottom left side portion of the device holder 7.

  A connection terminal insertion recess 79 that allows insertion of a connection terminal 6 to be described later is formed in a groove shape that allows insertion of each pierce portion 63, and includes the above-described through-hole 72.

  There are two types of connection terminals 6, an LED connection terminal 6 b for connecting the LED 30 to the flat cable 100, and a resistance connection terminal 6 a for connecting the resistor 40 to the flat cable 100. And a contact plate 61 having a contact convex portion 61 a that contacts the contact terminals 32, 41 of the resistor 4, a horizontal plate portion 62 that is substantially perpendicular to the contact plate 61 and has a key shape in plan view, and the horizontal plate portion 62. And a piercing portion 63 provided at the tip of the piercing.

  The connection terminal for resistance 6a and the connection terminal for LED 6b adjust the length in the width direction W and the direction of the key in the horizontal plate part 62 so that the pierced part 63 is positioned at the position of the conductor 101 of the flat cable 100. It can arrange | position so that the position of the longitudinal direction L may match.

  The pierce part 63 is composed of a roof part 63a having a semicircular shape when viewed from the front and a piercing blade 63b projecting downward from both ends in the width direction W of the roof part 63a. In the present embodiment, one piercing portion 63 includes a total of two piercing blades 63b arranged at one end side with a predetermined interval in the longitudinal direction L and one piercing blade 63b on the other end side. Three piercing blades 63b are provided.

  In addition, although the intermediate terminal 5 and the connection terminal 6 are comprised with the 0.1-0.5-mm-thick copper alloy board | plate material, according to the size of LED30 etc., about 0.2-0.25-mm-thick copper Alloy plate materials are preferred. Moreover, what is necessary is just to have electroconductivity, and it is not limited to the said copper alloy.

  As shown in FIGS. 3 and 4, the flat cable 100 includes two conductors 101 disposed at a predetermined interval in the width direction W and a non-conductive covering the two conductors 101 integrally. The laminate sheet 102 is composed of a conductive laminate sheet 102. Although only a part of the flat cable 100 is shown in the figure, the flat cable 100 is formed with a necessary length.

  Further, the flat cable 100 has flexibility, and is bent to be hooked 110 formed by a convex shape in a side view, that is, a step shape higher than other portions, and a planar body corresponding to the length of the under holder 9. Is forming.

  The hooking portion 110 is formed by bending the flat cable 100 at the valley fold line A and by folding the flat cable 100 at the mountain fold line B so that the hooking portion 110 having a convex shape in side view is eccentric in the thickness direction H. In addition, the space | interval of the valley fold line A and the mountain fold line B is formed substantially the same as the height inside the engaging groove 91 of the under holder 9, and the space | interval of the mountain fold line B is substantially the same as the length inside the engaging groove 91 of the under holder 9. Is formed. Further, the pair of bent portions 100 a and 100 b formed at the front and rear ends of the hooking portion 110 are longer than the engaging portions between the engaging claws 7 a and 7 b of the device holder 7 and the engaged portions 93 a and 93 b of the under holder 9. It is arranged at a position outside the direction L.

  The under holder 9 has a concave engaging groove 91 that is slightly wider than the engaging portion 110 of the flat cable 100 and whose depth is slightly deeper than the thickness of the flat cable 100, which allows the flat cable 100 to be engaged. It is formed eccentrically in the thickness direction H. As shown in FIGS. 2 and 3, a recessed engaged portion 93 a to which the engaging claw 7 a of the device holder 7 is engaged is formed on the rear side of both side surfaces in the width direction W.

  Further, on the front side of both side surfaces in the width direction W, concave engaged portions 93b are formed to which the engaging claws 7b of the device holder 7 are engaged. Further, the pair of engaged portions 93 a and 93 b are arranged at positions outside the longitudinal direction L from the piercing blade 63 b of the piercing portion 63 protruding from the bottom surface of the device holder 7.

  In addition, an avoiding recess 92 that prevents the piercing blade 63 b penetrating the flat cable 100 is provided in the vicinity of the center of the engaging groove 91 in plan view.

  Next, assembly of the LED modules 1 each configured as described above will be described.

  First, as shown in FIG. 4, the connection terminal 6 is held in the connection terminal insertion recess 79 of the device holder 7 so that the piercing blade 63 b protrudes downward so that the contact plate 61 penetrates the through hole 72. Insert it.

  By inserting the connection terminal 6 into the connection terminal insertion recess 79, the connection terminal 6 is in a mode in which the piercing blade 63 b protrudes from the bottom surface of the device holder 7, and the contact plate 61 penetrating the through hole 72 is enclosed by the enclosure block. It becomes an aspect which protrudes in the device insertion recessed part 70 from 71 planar view inner side.

  Then, the intermediate terminal 5 is inserted from above the device insertion recess 70 of the device holder 7 to which the connection terminal 6 is inserted. Accordingly, the amplitude portion 51a is disposed on the side portion of the surrounding block 71, the terminal contact portion 52 is disposed at a position facing the contact plate 61 in the width direction W, and the one-side longitudinal frame 53a extends in the width direction W. It can be inserted in a fixed manner.

  The electronic device 3 is inserted from above the device insertion recess 70 in which the intermediate terminal 5 and the connection terminal 6 are inserted. Specifically, the resistor 40 is inserted and inserted so as to be sandwiched from above between the contact plate 61 of the resistor connection terminal 6a and the terminal contact portion 52 of the resistor arrangement opening 55a.

  The LED 30 is inserted and inserted so as to be sandwiched from above between the contact plate 61 of the LED connection terminal 6b and the terminal contact portion 52 of the LED arrangement opening 55b. Thereby, the electronic device 3, the intermediate terminal 5, and the connection terminal 6 can be assembled | attached to the device holder 7 (refer FIG. 5).

  Next, after the hooking portion 110 of the flat cable 100 is put on the hooking groove 91 of the under holder 9 from above (see FIG. 6), the electronic device 3, the intermediate terminal 5, and the connection terminal 6 are assembled. Then, the hooking portion 110 of the flat cable 100 is sandwiched between the opposing surfaces of the under holder 9 in the vertical direction.

  When the hooking portion 110 is sandwiched, the engaging claws 7 a and 7 b of the device holder 7 and the engaged portions 93 a and 93 b of the under holder 9 are made from the piercing blade 63 b of the connection terminal 6 protruding from the bottom surface of the device holder 7. The under holder 9 is engaged with the bottom surface of the device holder 7 from below by engaging with each other at positions outside the longitudinal direction L (see FIGS. 2 and 3).

  Further, the engaging portions 110 of the flat cable 100 are formed on both side surfaces in the longitudinal direction forming the engaging grooves 91 of the under holder 9, that is, both flange portions and the upper surface, and the bottom surface of the device holder 7 and the inside of the flange protruding portions 7 c and 7 c. Is inserted.

  Thereby, the piercing blade 63b of the piercing portion 63 protruding downward from the bottom surface of the device holder 7 is pressed downward by the roof portion 63a via the connection terminal insertion recess 79, and the non-conductive laminate sheet 102 of the flat cable 100 is pressed. The connection terminal 6 and the conductor 101 are electrically connected through the conductor 101.

  Thereafter, when the cover member 2 is fitted from above into the cover fitting portion 70A of the device holder 7 to which the electronic device 3, the intermediate terminal 5, and the connection terminal 6 are assembled, the assembly of the LED module 1 is completed ( (See FIG. 1).

  According to the connection structure having the above-described configuration, when the device holder 7 and the under holder 9 are fitted, the hooking portion 110 of the flat cable 100 is sandwiched in the vertical direction, and the piercing blade of the connection terminal 6 that protrudes from the bottom surface of the device holder 7 Since 63b is penetrated and connected to the conductor 101 of the flat cable 100, the LED chip 30 and the resistor 40 of the electronic device 3 can be connected to the flat cable 100 in a stable state.

  Further, after the hooking portion 110 of the flat cable 100 is put on the hooking groove 91 of the under holder 9, the engaging claws 7 a and 7 b of the device holder 7 and the engaged portions 93 a and 93 b of the under holder 9 are connected to the device holder 7. Of the connecting terminals 6 projecting from the bottom surface of each other at a position outside the longitudinal direction L from the piercing blade 63b.

  Thereby, when an external force in the longitudinal direction L is applied to the flat cable 100 due to deformation or extension, the engagement claws 7a and 7b of the device holder 7 and the engaged portions 93a and 93b of the under holder 9 An external force is concentrated and applied to the bent portions 100a and 100b of the flat cable 100 formed outside the engaging portion. That is, the external force does not affect the connection portion between the piercing blade 63b of the connection terminal 6 and the conductor 101 of the flat cable 100, and connection reliability is improved.

  Further, since the hooking portion 110 of the flat cable 100 is hooked in the hooking groove 91 of the under holder 9 and the device holder 7 and the under holder 9 are fitted, the position with respect to the flat cable 100 can be easily determined.

  Therefore, the piercing blade 63b of the connection terminal 6 can be reliably penetrated with respect to the conductor 101 of the flat cable 100 to be electrically connected.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The connection structure of the present invention corresponds to the LED module 1,
Similarly,
The front-rear direction corresponds to the longitudinal direction L,
The electronic components correspond to the electronic device 3, the LED 30, and the resistor 40,
One contact corresponds to one side contact 32a, 41a,
The other contact corresponds to the other contact 32b, 41b,
The terminal member corresponds to the intermediate terminal 5,
The connection terminal corresponds to the connection terminal 6,
The connection portion and the through connection portion correspond to the piercing blade 63b,
The first box corresponds to the device holder 7,
The second box corresponds to the under holder 9
The electric cable corresponds to the flat cable 100,
The flat conductor corresponds to the conductor 101,
The covering member corresponds to the non-conductive laminate sheet 102,
The engaging portion of the engaging means corresponds to the engaging claws 7a and 7b,
The engaged portions of the engaging means correspond to the engaged portions 93a and 93b,
The hooked portion corresponds to the hooking groove 91,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

  In the embodiment, the hooking portion 110 of the flat cable 100 is formed in a convex shape in a side view, and the hooking groove 91 of the under holder 9 to which the hooking portion 110 is hooked is formed in a concave shape in a side view. May be formed in a concave shape in a side view, and the engaging groove 91 may be formed in a convex shape in a side view.

The perspective view of a LED module. The bottom view of a LED module. FIG. 3 is a cross-sectional view of the LED module shown in FIG. The disassembled perspective view of an LED module. Explanatory drawing about assembly of a device holder, an under holder, and a flat cable. Explanatory drawing about assembly of device holder and under holder. Explanatory drawing about the positional relationship of the engaging claw of a device holder, the piercing blade of a connection terminal, and the bending part of a flat cable.

1 ... LED module 3 ... electronic device 30 ... LED
40 ... resistor 6 ... connecting terminal 63b ... piercing blade 7 ... device holder 7a, 7b ... engaging claw 9 ... under holder 91 ... engagement groove 93a, 93b ... engaged portion 100 ... flat cable 100a, 100b ... bending portion 101 ... conductor 102 ... non-conductive laminate sheet 110 ... hanging portion L ... longitudinal direction W ... width direction H ... thickness direction

Claims (1)

A connection terminal for electrically connecting the electronic component to an electric cable in contact with one of the contacts disposed opposite to the electronic component;
A first box-body inserted the electronic component及beauty before Symbol connection terminals,
A second box that is fitted so as to sandwich the electric cable with respect to the bottom surface of the first box;
The connection terminal is provided with a connection portion that is connected to the electrical cable in a state in which the position in the longitudinal direction is constrained,
The electric cable is constituted by a flat cable including a plurality of flat conductors arranged at predetermined intervals in the width direction and a covering member that integrally covers the plurality of flat conductors, and the flat cable. And forming a hook portion eccentric in the thickness direction in a part of the longitudinal direction of
A through connection that connects the flat conductor of the flat cable in the thickness direction in a posture protruding from the bottom surface of the first box in a state where the connection terminal is inserted into the first box. constituted by a part,
On the opposing surface of at least one of the first box and the second box, a hooked part that allows the hooking part to be hooked is provided,
At both ends in the longitudinal direction of the first box, it is provided with a flange projecting piece projecting downward,
In a location corresponding to the connection terminal on the upper surface of the second box, an avoiding recess for preventing the penetration connection portion that penetrates the flat cable in the thickness direction,
On the front side and the rear side of the opposite side surfaces in the width direction of the first box and the second box, provided with engaging means configured to be engaged with each other and engaged parts,
The engaging means is arranged at a position outside the connecting portion in the longitudinal direction in the longitudinal direction,
A pair of bent portions formed at the front and rear ends of the hooking portion or the hooked portion of the flat cable are disposed at positions outside the engaging portion of the engaging means in the front-rear direction,
The engaging portion is engaged with the engaged portion, and the engaging portion is sandwiched between both the longitudinal side surfaces and the upper surface of the second box and the inner side of the bottom surface and the flange protruding piece of the first box. , Engaging the engaging means to fit the first box and the second box,
When the first box and the second box are fitted, the flat conductor in the hooking portion of the flat cable at the through-connection portion of the connection terminal inserted into the first box. Is a connection structure in which the electronic component and the flat cable are electrically connected to each other in a thickness direction.

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