JP2002044837A - Water-proof structure of cable pull-in section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-proof structure of a cable pull-in section by which number of components can be decreased, assembly processes can be simplified and a cost of constitution of a device can be reduced. SOLUTION: In this water-proof structure of a cable pull-in section, a drain wire 43 which is stripped and exposed is cut at the base, and a connecting cable 31 is pulled into a case body 1 with a covered electric wire 55 for earth connection joined, then the first heat shrinking tube 61 is mounted, wherein heat shrinking is applied to cover from an outer periphery of the outermost covering 47 up to outer peripheries of a set of covered electric wires 41 and the covered electric wire 55 for earth connection, within the case body 1. When the heat shrinking tube 61 is heat-shrinked, thermal melting resin constituting an inner layer of the heat shrinking tube 61 is melted and penetrated into spaces between the covered electric wires 41a, 55 and the drain wire 43, and the spaces are sealed. In addition, within the space in the outermost covering 47, an adhesive agent with lower viscosity is filled through an opening 47a of the outermost covering 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a cable lead-in portion for leading a connection cable into a case body.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing a conventional waterproof structure of a cable lead-in portion. In this waterproof structure, the connection cable 101 is not drawn directly into the case body 103,
The male waterproof connector 10 is attached to the end of the connection cable 101.
5, a female waterproof connector 107 is provided on the case body 103 so as to penetrate the case body 103 in and out. An apparatus main body (not shown) that needs to be waterproof is provided inside the case body 103, and the electric connection between the main body and the connection cable 101 is made by the male and female waterproof connectors 105 and 107, and the waterproof connector 107 and the apparatus. This is performed via the internal wiring 109 for electrically connecting the main body.
The connection between the internal wiring 109 and the waterproof connector 107 is performed by soldering.

[0003]

However, in the above-mentioned conventional waterproof structure, the waterproof connectors 105 and 107 are expensive and complicated assembling work such as screwing and soldering is required at the time of assembly. Increase in the number of parts,
There are problems such as the complicated assembly process and the high cost of the device configuration.

[0004] In view of the above problems, it is an object of the present invention to provide a waterproof structure for a cable lead-in portion which can reduce the number of parts, simplify the assembling process, and reduce the cost of the device configuration.

[0005]

The technical means for achieving the above object includes a covered electric wire group composed of a plurality of covered electric wires, a drain wire formed by knitting or twisting a plurality of metal wires, A connection cable including a conductive shield layer that covers the covered electric wire group and the drain wire so as to be in contact with the drain wire, and an insulating outermost coating provided on the outer periphery of the shield layer, is waterproof. A waterproof structure for a cable lead-in portion that is drawn into a case body that accommodates a necessary device main body, wherein the terminal portion of the connection cable that is drawn into the case body through a through hole provided in the case body. An exposed portion of the drain line, which is exposed by peeling the outer coating and the shield layer, is cut at or near a base end of the exposed portion. In the state where the coated electric wire for ground connection is electrically connected to the end of the exposed portion remaining after the cutting, in the case body, an outer layer made of a heat-shrinkable resin and an inner layer made of a heat-meltable resin are provided. A first heat-shrinkable tube comprising: a first heat-shrinkable tube which is externally inserted into the connection cable and heat-shrinked, and is exposed by peeling from the outer periphery of the outermost covering so as to cover the opening of the outermost covering. It is characterized in that the insulated wire group and the outer peripheral portion of the insulated wire for ground connection are in close contact with each other.

Preferably, in the heat-shrinkable first heat-shrinkable tube, a low-viscosity adhesive that enters the gap in the outermost coating of the connection cable by capillary action is provided. Preferably, the space is filled from the opening of the outermost coating.

[0007] More preferably, the viscosity of the adhesive is 0.1 Pa · s or less.

Preferably, an outer diameter of the first heat-shrinkable tube in a state where the first heat-shrinkable tube is heat-shrinked and attached to the connection cable is set to a value larger than an inner diameter of the through hole provided in the case body. It is good to be.

Further, preferably, a cylindrical portion is provided on an outer surface of the case body so as to protrude from the outer wall surface,
The internal cavity of the cylindrical portion functions as the through hole,
In a state where one end of the first heat-shrinkable tube attached to the outer peripheral portion of the connection cable in the case body is in contact with the inner wall surface of the case body, the heat-shrinkable tube is heat-shrinked outside the case body. It is preferable that the second heat-shrinkable tube be adhered from the outer peripheral portion of the cylindrical portion to the connection cable so as to cover an outer opening of the cylindrical portion into which the connection cable is inserted.

[0010] Further, preferably, a convex portion for locking the second heat-shrinkable tube is provided on an outer peripheral portion of the cylindrical portion.

Preferably, the case body is a case body of an on-vehicle image pickup device which is installed facing the outside of the vehicle and simultaneously images blind spots in two different directions around the vehicle, which are blind spots of a driver. Is good.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <Outline Description of In-Vehicle Imaging Device> Here, a case where the waterproof structure of a cable lead-in section according to the present embodiment is applied to an in-vehicle imaging device will be described. FIG. 1 is a cross-sectional view of an in-vehicle imaging device to which a waterproof structure of a cable lead-in portion according to an embodiment of the present invention is applied, FIG. 2 is an enlarged view of the cable lead-in portion of FIG. 1, and FIG. FIG.

This in-vehicle image pickup apparatus is, as shown in FIG.
A blind body is provided with a case body 1 and an apparatus main body 3 housed in the case body 1, is installed facing the outside of the vehicle, and has a blind spot in two different directions which becomes a blind spot of a driver around the vehicle. Are simultaneously imaged. The case 1 is provided with an attachment 5 for attaching the vehicle-mounted imaging device to the vehicle body.

As a preferable use form of the on-vehicle imaging device, the on-vehicle imaging device is installed at a front end portion of a vehicle (a front grille or the like), and the left and right blind spot regions on the front side of the vehicle are imaged by the on-vehicle imaging device. And so on.

The apparatus main body 3 includes an imaging unit 11 and light 13 incident from an imaging area (blind spot area) in two directions, left and right.
A prism (reflecting means) 15 having two reflecting surfaces for reflecting L and 13R toward the imaging unit 11;
And a circuit unit 19 that performs drive control and the like of the imaging unit 11.

The circuit unit 19 includes three circuit boards 21, 23, and 25 on which various elements are provided. The three circuit boards 21, 23, 25 are arranged in a three-tiered manner at a predetermined interval, and the imaging unit 11 is arranged on the uppermost circuit board 21. Also,
The electrical connection between the circuit board 21 and the circuit board 23 is made by a rigid flexible board 27,
3 and the circuit board 25 are electrically connected by the connector 2
9. The lowermost circuit board 25 has a connector 3 connected to an end of the connection cable 31.
3 is provided with a connection part (not shown) to be connected.

The prism 15 has a substantially triangular prism shape, and any one of the three side surfaces 15a to 15c is provided.
Sides 15a to 15c (here 15a, 15b)
Are light-transmitting left and right windows 35 provided in the case body 1.
L, 35R. And
Lights 13L and 13R from the left and right imaging regions that have entered the case body 1 from the left and right windows 35L and 35R are incident on the prism 1.
5, is reflected by the left and right side surfaces 15 a and 15 b of the prism 15 functioning as a reflection surface, is reflected toward the imaging unit 11, and is introduced into the imaging unit 11.

The light beams 13L and 13R introduced into the image pickup unit 11 enter the image pickup device 11b via the imaging lens 11a provided in the image pickup unit 11, whereby the left and right images are picked up by the image pickup device 11b. An image of the region is captured. The taken image is the circuit unit 1
9 and the connection cable 31 are output to the outside via one of the covered wires 41a described later.

<Detailed Description of Main Part> Connection Cable 31
As shown in FIG. 3, a covered wire group 41 composed of a plurality of covered wires 41a, a drain wire 43 formed by knitting (or twisting) a plurality of metal wires,
A conductive metal foil layer (shield layer) 45 for covering the covered wire group 41 and the drain wire 43 so as to be in contact with the drain wire 43;
Outermost covering 47 covering the drain line 43
And

As shown in FIG. 2, such a connection cable 31 is drawn into the case body 1 through a cable lead-in portion 51. This cable lead-in part 5
1, a cylindrical portion 53 is provided so as to protrude outward from the outer surface of the case body 1, and an internal cavity (through hole) of the cylindrical portion 53 is provided.
The connection cable 31 is drawn into the case body 1 through the inside. Here, a convex portion 53a having a triangular cross-section that is continuous in a ring shape over the entire circumference of the cylindrical portion 53 protrudes from the outer peripheral portion of the cylindrical portion 53.

Hereinafter, an assembling process of the cable lead-in portion 51 will be described.

First, as shown in FIG.
The outermost coating 47 and the metal foil layer 45 of the connection cable 31 are peeled off in a predetermined stripping section at the end of the terminal 1 to expose the covered electric wire group 41 and the drain wire 43.
Subsequently, the exposed portion of the exposed drain line 43 is
The conductor at the base end or near the base is cut off, and the conductor of the insulated wire 55 for ground connection whose end is peeled and the conductor is exposed is soldered to the tip of the remaining exposed part. Connect with Reference numeral 57 in FIG. 4 indicates a solder connection portion.

Subsequently, each of the covered electric wires 41a and the drain wires 43, which have been peeled and exposed, are bent radially outward from the openings 47a of the outermost covering 47 as shown in FIG. With the gap between 41a and the drain wire 43 enlarged, in the gap in the outermost coating 47 (particularly, in the gap between each coated electric wire 41a and the drain wire 43),
A low-viscosity adhesive (in this case, an instant adhesive) 59 (see FIG. 6) is filled through the opening 47a of the outermost coating 47 as shown by an arrow A in FIG. In the filling step of the adhesive 59, if the outermost coating 47 and the metal foil layer 46 shown in FIG.
5 may be performed before connection.

Here, as the adhesive 59 to be used, a low-viscosity adhesive which enters into the gap in the outermost coating 47 by capillary action is used. The viscosity of the adhesive is preferably 0.1 Pa · s or less. Here, a low-viscosity adhesive (here, a cyano-based adhesive) having a viscosity of 10 mPa · s at a temperature of about 20 ° C. is used. Can be

Subsequently, as shown in FIG. 7, the distal end of the connection cable 31 is drawn into the case 1 through the internal cavity of the cylindrical portion 53 of the case 1, and the first end of the connection cable 31 is inserted into the outer periphery of the connection cable 31. Is attached.

The first heat-shrinkable tube 61 has a double structure having an outer layer and an inner layer. The outer layer is made of a heat-shrinkable resin such as an electron beam crosslinked soft flame-retardant polyolefin resin. The inner layer is formed of a hot-melt resin such as a hot-melt adhesive.

To mount the first heat-shrinkable tube 61, the heat-shrinkable tube 61 is inserted into the connection cable 31 in the case body 1 and heat-shrinked by heating, so that the opening 47a of the outermost coating 47 is opened. Outermost covering 47
Covered wire group 41 exposed by peeling from the outer periphery of
And it is carried out by closely contacting the outer peripheral portion of the insulated wire 55 for ground connection.

Then, when the first heat-shrinkable tube 61 is extrapolated to a predetermined position of the connection cable 31 and heated and contracted, the first heat-shrinkable tube 61 is moved to the peeling area of the connection cable 31. Is heated, the heat-meltable resin that forms the inner layer portion of the heat-shrinkable tube 61 is melted by heating, and enters the gap between the covered electric wires 41 a and 55 and the drain wire 43, and enters. The gap is sealed by the hot-melt resin.

Here, the inner diameter of the inner cavity of the cylindrical portion 53 is set to be equal to or slightly larger than the outer diameter of the connection cable 47, and is thermally shrunk so that the connection cable 31
The outer diameter of the heat-shrinkable tube 61 attached to the outer peripheral portion is set to a value larger than the inner diameter of the internal cavity of the cylindrical portion 53.

Subsequently, on the outside of the case body 1, FIG.
As shown in (2), mounting of the second heat-shrinkable tube 63 is performed. The second heat-shrinkable tube 63 also has a double structure including an outer layer portion and an inner-layer portion similarly to the first heat-shrinkable tube 61, and the composition of each layer is the same as that of the first heat-shrinkable tube 61. The same is true.

As shown in FIG. 2, the second heat-shrinkable tube 63 is attached to one end of the first heat-shrinkable tube 61 attached to the outer periphery of the connection cable 31 in the case body 1. With the second heat-shrinkable tube 63 being extrapolated from the outer peripheral portion of the tubular portion 53 to the connection cable 31 in a state of being in contact with the inner wall surface of the case body 1, the heat-shrinkable tube 63 is heated and contracted by heating. The heat-shrinkable second heat-shrinkable tube 63 is adhered from the outer peripheral portion of the tube portion 53 onto the connection cable 31 so as to cover the outer opening 53b of the tube portion 53 into which the connection cable 31 is inserted. .

Each of the coated electric wires 41a and 55 of the connection cable 31 drawn into the case body 1 in this manner is connected to the apparatus main body 3 via the connector 33 connected to the end thereof. The insulated wire 55 for ground connection is used for ground connection, and each insulated wire 41a is used for power supply to the apparatus main body 3 and transmission of signals (image signals and the like).

According to this embodiment, since the first and second heat-shrinkable tubes 61 and 63 are used for waterproofing, the number of parts can be reduced, the assembly process can be simplified, and the device can be configured. Cost can be reduced.

By the way, the drain wire 43 formed by the knitted wire easily forms a minute gap, and rainwater easily penetrates into the case body 1 through the inside of the connection cable 31 through the minute gap. However, according to the present embodiment, the exposed portion of the drain line 43, which is peeled and exposed, is cut at or near the base end, and the remaining exposed portion of the drain line 43 is connected to the ground connection. In a state where the covered electric wires 55 are connected to each other,
The heat-shrinkage is performed so as to cover the opening 47a of the outermost covering 47 from the outer peripheral part of the outermost covering 47 to the outer peripheral part of the covered electric wire group 41 exposed by peeling and the outer peripheral part of the covered electric wire 55 for ground connection. The first heat-shrinkable tube 61 is connected to the connection cable 31 in order to bring the first heat-shrinkable tube 61 into close contact.
In the surrounding area B surrounding the stripped area of
The joined electric wire 55 for ground connection is fastened by the first heat-shrinkable tube 61. Thus, rainwater that enters the case body 1 through the outermost coating 47 of the connection cable 31 (particularly, within the minute gap of the drain wire 43) can be effectively blocked in the surrounding area B. it can.

Further, since the first heat-shrinkable tube 61 has an outer layer portion made of a heat-shrinkable resin and an inner layer portion made of a heat-meltable resin, the first heat-shrinkable tube 61 is positioned at a predetermined position of the connection cable 31. When the tube 61 is heated and contracted by heating, the tube 61 is heated by heating in the surrounding area B.
The heat-fusible resin forming the inner layer portion of the
1a, 55 and the gap between the drain line 43,
The gap can be sealed by the infiltrated heat-meltable resin, and waterproofing can be surely achieved.

Further, in the end portion of the outermost coating 47 of the connection cable 31 covered by the first heat-shrinkable tube 61, a low-viscosity liquid that penetrates into a gap in the outermost coating 47 by capillary action. An adhesive (here, a cyano-based adhesive having a viscosity of 10 mPa · s at a temperature of about 20 ° C.) 59 is filled into the gap through the opening 47 a of the outermost coating 47. 59 can be filled in the gap located deep from the opening 47a of the outermost covering 47, and the filled adhesive 59 can further enhance the waterproof effect.

Further, the outer diameter of the first heat-shrinkable tube 61 in a state where the first heat-shrinkable tube 61 is heat-shrinked and attached to the connection cable 31 is set to be larger than the inner diameter of the internal cavity of the cylindrical portion 53. When the cable 31 is pulled, the first heat-shrinkable tube 61 is locked to the outer peripheral portion of the inner cavity of the cylindrical portion 53 on the inner wall surface of the case body 1, so that the connection cable 31 moves outward. Since the connection cable 31 is stopped, the tension on the connection cable 31 is reduced.
To the connection portion between the device body 3 and the inside of the case body 1 to prevent the connection state of the connection portion from deteriorating or being disconnected, and it is not necessary to take any special measures against the tensile tension of the connection cable 31. .

Further, the second heat-shrinkable tube 63 heat-shrinked from the outer peripheral portion of the tube portion 53 to the connection cable 31 so as to cover the outer opening 53b of the tube portion 53 into which the connection cable 31 is inserted is adhered. Therefore, the outermost coating 4 of the connection cable 31 is formed by the second heat-shrinkable tube 63.
Rainwater that enters through a gap between the inner peripheral surface of the cylinder portion 53 and the inner peripheral surface of the cylindrical portion 53 can be reliably blocked.

Further, the second heat-shrinkable tube 63 is provided inside the case body 1 with the first heat-shrinkable tube 63 attached to the connection cable 31.
The heat-shrinkable tube 61 is heat-shrinked in a state where one end of the heat-shrinkable tube 61 is in contact with the inner wall surface of the case body 1 and attached to the cylindrical portion 53 and the connection cable 31. Can be reliably positioned and fixed along.

When the second heat-shrinkable tube 63 is thermally contracted, the heat-shrinkable tube 63 is locked by the convex portion 53a provided on the outer peripheral portion of the cylindrical portion 53. Tube part 5 due to heat shrinkage on 53
3 can be effectively suppressed from slipping toward the distal end side, so that the length of the cylindrical portion 53 protruding from the outer wall surface of the case body 1 is not increased, and the heat-shrinkable tube 6 after the heat shrinkage is reduced.
The width along the axial direction of the region where the portion 3 covers the cylindrical portion 53 can be sufficiently ensured, and the waterproof reliability of the cable lead-in portion 51 can be improved.

In this embodiment, the waterproof structure of the cable lead-in portion according to the present invention is applied to the vehicle-mounted imaging device. The waterproof structure of the cable lead-in section according to the present invention may be applied.

[0042]

According to the first aspect of the present invention, since waterproofing is performed using the first heat-shrinkable tube, the number of parts can be reduced, the assembling process can be simplified, and the apparatus configuration can be reduced in cost.

By the way, the drain wire formed by the knitted wire or the stranded wire tends to form a minute gap, and rainwater easily enters the case body by passing through the inside of the connection cable through the minute gap. However, according to the present invention, the exposed portion of the drain wire that has been peeled and exposed is cut at or near the base end, and a covered electric wire for ground connection is applied to the remaining exposed portion of the drain wire. In a connected state, heat shrinks from the outer peripheral portion of the outermost coating so as to cover the opening of the outermost coating of the connection cable to the outer peripheral portion of the insulated wire group exposed by peeling and the outer peripheral portion of the insulated wire for ground connection. In order to bring the first heat-shrinkable tube into close contact with the first heat-shrinkable tube, the first heat-shrinkable tube surrounds the stripped region of the connection cable in the surrounding region, and the covered electric wire group and the connected grounding contact. Covered wire of use is to be clamped by the first heat-shrinkable tubing. This makes it possible to effectively block rainwater that enters the case through the outermost coating of the connection cable (particularly, within the minute gap between the drain wires) in the outer peripheral region.

Further, since the first heat-shrinkable tube has an outer layer made of a heat-shrinkable resin and an inner layer made of a heat-meltable resin, the first heat-shrinkable tube is extrapolated to a predetermined position of the connection cable. When heated and thermally contracted, the heat-meltable resin that forms the inner layer portion of the tube is melted by heating and enters the gap between the coated electric wires in the outer surrounding area, and the heat-melted resin that has entered The gap can be sealed by the conductive resin, and waterproofing can be surely achieved.

According to the second and third aspects of the present invention,
In the heat-shrinkable first heat-shrinkable tube, a low-viscosity adhesive that enters the gap in the outermost coating of the connection cable by capillary action through the opening of the outermost coating. Since it is filled inside, the adhesive can be filled from the opening of the outermost coating to the gap located at a deep position, and the waterproof effect can be further enhanced.

According to the fourth aspect of the present invention, the outer diameter of the first heat-shrinkable tube in a state where the first heat-shrinkable tube is heat-shrinked and attached to the connection cable is equal to the inside diameter of the through hole provided in the case body for drawing in the connection cable. When the connection cable is pulled, the first heat-shrinkable tube is locked to the outer peripheral portion of the through hole of the case body, and the connection cable moves outward. Is stopped, the tension of the connection cable is applied to the connection between the connection cable and the device body in the case body, so that the connection state of the connection can be prevented from being deteriorated or disconnected, and the tension of the connection cable can be prevented. No special measures need to be taken.

According to the fifth aspect of the present invention, the second heat-shrinkable tube heat-shrinked from the outer peripheral portion of the tube portion to the connection cable so as to cover the outer opening of the tube portion into which the connection cable is inserted. Are tightly adhered to each other, so that the second heat-shrinkable tube can reliably block rainwater that enters through a gap between the outermost coating of the connection cable and the inner peripheral surface of the cylindrical portion.

The second heat-shrinkable tube is heat-shrinked in a state in which one end of the first heat-shrinkable tube attached to the connection cable in the case is brought into contact with the inner wall surface of the case, and the second heat-shrinkable tube is formed into a cylindrical portion. And the connection cable,
The positioning and fixing along the longitudinal direction of the connection cable can be reliably performed in the cable lead-in section.

According to the sixth aspect of the present invention, at the time of heat shrinkage, the second heat shrinkable tube is locked by the convex portion provided on the outer peripheral portion of the cylindrical portion, whereby the second heat shrinkable tube is formed. Since it is possible to effectively suppress the sliding of the cylindrical portion toward the distal end due to thermal shrinkage on the cylindrical portion, without increasing the protruding length of the cylindrical portion from the outer wall surface of the case body, after the thermal shrinkage, The width along the axial direction of the region where the second heat-shrinkable tube covers the cylindrical portion can be sufficiently ensured, and the waterproof reliability of the cable lead-in portion can be improved.

According to the invention described in claim 7, according to claim 1 of the present invention,
The waterproof structure of the cable lead-in portion of the vehicle-mounted image pickup device is reduced by using the waterproof structure of the cable lead-in portion described in any one of (1) to (6), while reducing the number of parts, simplifying the assembling process, and reducing the cost of the device configuration. Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vehicle-mounted imaging device to which a waterproof structure of a cable lead-in portion according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged view of a cable lead-in portion of FIG.

FIG. 3 is a sectional view of a connection cable.

FIG. 4 is an explanatory view of an assembling process of a cable lead-in section.

FIG. 5 is an explanatory diagram of a process of assembling a cable lead-in section.

FIG. 6 is a cross-sectional view of the connection cable in a state where an adhesive is filled in a gap in the outermost coating.

FIG. 7 is an explanatory view of an assembling process of a cable lead-in section.

FIG. 8 is a sectional view of a conventional waterproof structure of a cable lead-in portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case body 3 Device main body 31 Connection cable 41 Insulated electric wire group 41a Insulated electric wire 43 Drain wire 45 Metal foil layer 47 Outermost coating 51 Cable lead-in part 53 Tube part 53a Convex part 55 Coated electric wire for ground connection 59 Adhesive 61 First Heat shrink tubing 63 second heat shrink tubing

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 5/225 H04N 5/225 C // H04N 7/18 7/18 J (72) Inventor Masayuki Ishikura Nagoya City, Aichi Prefecture 1-7-10 Kikuzumi, Minami-ku Harness Research Institute, Ltd. F-term (reference) 5C022 AA04 AC21 AC42 AC51 AC65 AC69 AC70 AC75 AC78 5C054 CC05 CD03 CE11 DA08 HA30 5G363 AA01 CA03 CA06 CB20

Claims (7)

[Claims] An insulated wire group comprising a plurality of insulated wires,
A drain wire formed by knitting or twisting a plurality of metal wires, a conductive shield layer covering the covered wire group and the drain wire so as to be in contact with the drain wire, and an outer periphery of the shield layer A connection cable having an insulating outermost coating provided on the case body has a waterproof structure of a cable lead-in portion that is drawn into a case body that accommodates a device body that requires waterproofing, and a through hole provided in the case body. An exposed portion of the drain wire, which is exposed by peeling the outermost coating and the shield layer at a terminal portion of the connection cable drawn into the case body through the base portion or a proximal end of the exposed portion, In the state where the coated electric wire for ground connection is electrically connected to the end of the exposed portion remaining after the cutting, In inner, a first heat-shrinkable tube comprising an inner layer portion formed of the outer layer portion and a heat-meltable resin comprising a heat-shrinkable resin is extrapolated is thermally shrunk to the connecting cable,
It is characterized by being covered from the outer peripheral portion of the outermost coating so as to cover the opening of the outermost coating, to the outer peripheral portion of the covered electric wire group exposed by peeling and the outer peripheral portion of the covered electric wire for ground connection. The waterproof structure of the cable entry section. 2. In the heat-shrinkable first heat-shrinkable tube, a low-viscosity adhesive that enters a gap in the outermost coating of the connection cable by capillary action is applied to the outermost coating. 2. The waterproof structure of a cable lead-in part according to claim 1, wherein the gap is filled into the gap from the opening. 3. The waterproof structure according to claim 2, wherein the viscosity of the adhesive is 0.1 Pa · s or less. 4. An outer diameter of the first heat-shrinkable tube in a state where the first heat-shrinkable tube is heat-shrinked and attached to the connection cable,
The waterproof structure for a cable lead-in part according to any one of claims 1 to 3, wherein the value is set to a value larger than the inner diameter of the through hole provided in the case body. 5. A cylindrical portion is provided on an outer surface of the case body so as to protrude from the outer wall surface, and an internal cavity of the cylindrical portion functions as the through hole. In a state in which one end of the first heat-shrinkable tube attached to the outer peripheral portion of the first heat-shrinkable tube is in contact with the inner wall surface of the case body, the second heat-shrinkable tube heat-shrinked outside the case body. The waterproof structure of a cable lead-in part according to claim 4, wherein the outer peripheral part of the cylindrical part is closely attached to the connection cable so as to cover an outer opening of the cylindrical part into which the connection cable is inserted. . 6. The waterproof structure for a cable lead-in portion according to claim 5, wherein a convex portion for locking the second heat-shrinkable tube is provided on an outer peripheral portion of the cylindrical portion. 7. The case body of an in-vehicle imaging device which is installed facing the outside of the vehicle and simultaneously captures two different blind spots, which are blind spots of a driver, around the vehicle. Claim 1
7. A waterproof structure for a cable lead-in part according to any one of claims 6 to 6.