JP2014150111A - Electric cable fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric cable fixing structure which reduces the impact of burrs or steps on the airtightness when molding a compact, and reduces the cost by decreasing the number of components.SOLUTION: In a structure for fixing an electric cable 17 to a housing 12 by sliding a cable fixing member 20 and fitting to the housing 12, an elastic O-ring 19 is attached to the electric cable 17 passing through the cable draw-out hole 16 of the cable fixing member 20 and the cable insertion hole 22 of the housing 12 in order. When the cable fixing member 20 is moved to a lock position, the O-ring 19 is collapsed between the holding portion 20h of the cable fixing member 20 and the housing 12 to fill the gap between the cable insertion hole 22 and the electric cable 17, and the electric cable 17 is fixed between the cable fixing member 20 and the housing 12 by the pressing force of the O-ring 19.

Description

  The present invention relates to an electric cable fixing structure, and more particularly to an electric cable fixing structure for fixing an electric cable connecting a circuit board disposed in a casing of an electronic device or the like and an external power source to the casing. Is.

  In general, an electronic device has a structure in which an electrical cable that connects a circuit board disposed in a device casing and an external power source is drawn out from the device casing. The electric cable is fixed to the device casing with a cable fixing part in the middle, and when pulled by receiving external force, the external force is received by the cable fixing part, and external force is directly applied to the connection part with the circuit board. Thus, disconnection is prevented (see, for example, Patent Document 1).

  7 to 9 show an example of an in-vehicle camera device provided with a cable fixing portion described in Patent Document 1, FIG. 7 is a sectional view of the in-vehicle camera device, and FIG. 8 is an in-vehicle camera device. FIG. 9 is an exploded perspective view, and FIG. 9 is a perspective view showing a part of the rear case of the in-vehicle camera device in a cutaway manner.

  As shown in FIGS. 7 and 8, the in-vehicle camera device 100 includes a front case 102a provided with an imaging lens unit 101 (see FIG. 7) for introducing imaging light at a front portion, and a waterproof packing at the rear portion of the front case 102a. A housing 102 having a rear case 102b that is disposed with 113 therebetween and fixed to the front case 102a with screws 103 (see FIG. 8). Further, as shown in FIG. 7, the image pickup device 104, the video circuit board 105, and the like are housed in the front case 102a, and a cable lead-out hole 106 is provided in the rear part of the rear case 102b. An electric cable 107 made of a video signal line, a power line, or the like is inserted into the connector, and a connector 108a provided at the tip of the electric cable 107 is connected to a connector 108b provided on the video circuit board 105 side. The electrical connection between the circuit and the outside is intended.

  Further, as shown in FIGS. 7 and 8, a holder 109 is provided in the middle of the electric cable 107 to fix the electric cable 107 to the housing 102 in the cable lead-out hole 106. The holder 109 is installed in a mold in a state where a part of the electric cable 107 is bent 90 degrees, and is integrated by filling the resin or the like forming the holder 109 therewith, so-called insert molding. The electric cable 107 is integrated. Then, by fixing the holder 109 to the cable drawing hole 106, the electric cable 107 is fixed to the rear case 102b together with the holder 109.

  The structure for fixing the electric cable 107 to the cable lead-out hole 106 will be described in more detail with reference to FIG. 9. As shown in FIGS. 7, 8, and 9, the cable lead-out hole 106 is formed outside the rear case 102b. A cylindrical wall 110a is erected on the outer periphery. Also, as shown in FIG. 8, four fan-shaped claws 110b are formed at equal intervals on the inner peripheral surface of the cable lead-out hole 106, and on the side surface of one end of the claw 110b in the circumferential direction, As shown in FIGS. 8 and 9, a stopper wall 110c is provided.

  On the other hand, a waterproof packing mounting portion 110d is provided between the cylindrical wall 110a and the four fan-shaped claws 110b, and a waterproof packing 111 made of a ring-shaped rubber material is mounted on the waterproof packing mounting portion 110d. It has come to be.

  The holder 109 has a bayonet structure that fits and is fixed to the cable lead-out hole 106 by rotating after being fitted into the cable lead-out hole 106. Here, as shown in FIG. 8, a virtual center line Ox when the holder 109 is rotated is defined as a rotation axis. The holder 109 has a structure in which the electric cable 107 is inserted and waterproofed and fixed, and a disk-shaped flange 109b provided at one end of a cylindrical boss portion 109a (see FIG. 9). The holding portion 109c that holds the electric cable 107 inserted through the inside of the boss portion 109a bent at a right angle to the rotation axis Ox, and a gap in the direction of the rotation axis Ox between the flange 109b and the circumferential direction of the outer periphery of the boss portion 109a It is composed of four fin portions 109d arranged.

  When assembling the in-vehicle camera device, the electric cable 107 with the connector 108a attached to the tip is inserted into the cable lead-out hole 106 from the outside of the rear case 102b, that is, the cylindrical wall 110a to which the waterproof packing 111 is attached. Then, the connector 108a is coupled to the connector 108b on the video circuit board 105 side. Thereafter, the front case 102 a and the rear case 102 b are fixed with the four screws 103.

  Next, the fin 109d of the holder 109 is inserted into the rear case 102b from between the claw 110b and the claw 110b of the rear case 102b, and the flange 109b is stored inside the cylindrical wall 110a. While being pressed against the rear case 102b, it is rotated clockwise around the rotation axis Ox.

  In this way, the waterproof packing 6 is pressed, and the fin portion 109d of the holder 109 and the claw 110b of the rear case 102b are fitted, so that the holder 109 and the rear case 102b are fixed and waterproof. The structure is maintained. Thereafter, an anti-rotation plate 112 that is engaged with the electric cable 107 and prevents the holder 109 from rotating counterclockwise is attached to the rear surface of the rear case 102b. Thereby, the rotation of the holder 109 in the clockwise direction is restricted by the end face of the fin portion 109d abutting against the stopper wall 110c of the rear case 102b, and the rotation in the counterclockwise direction is caused by the electric cable 107 abutting against the rotation prevention plate 112. Being regulated. 7 and 9 show a state in which the electric cable 107 is attached to the rear case 102b in this way.

JP, 2011-46331, A.

  As described above, in the electric cable fixing structure in the in-vehicle camera device described in Patent Document 1, the electric cable is attached to the housing by fixing the holder to the cable drawing hole using a bayonet structure. This bayonet structure is a structure in which the holder is rotated and fixed with respect to the housing, so if there is a burr or a step in the rotating flange with the waterproof packing sandwiched between the housing, the waterproof packing will twist, etc. There was a problem affecting hermeticity. In addition, there is a problem that man-hours required for management to obtain accuracy when molding the casing and the holder and man-hours required for removing burrs attached to the holder immediately after molding are required. In addition, an anti-rotation plate that stops the rotation of the holder is required, which increases the number of parts and increases costs.

  Accordingly, the present invention has been made in view of the above-mentioned problems, and an electric cable that can reduce the influence on the airtightness caused by burrs and steps during molding of the parts, and can reduce the number of parts to reduce the cost. The purpose is to provide a fixed structure.

The present invention has been proposed in order to achieve the above object, and the electric cable fixing structure of the present invention includes an electric cable for connecting between a circuit board disposed in the casing and an external power source to the casing. An electric cable fixing structure for fixing,
A front and rear, left and right, upper and lower surfaces, and a cable fixing member to which the electric cable is attached, and an inclined surface inclined from the rear surface toward the lower surface,
The rear surface, the left and right side surfaces, the upper and lower surfaces, and the inclined surfaces that are formed in the housing and correspond to the surfaces and the inclined surfaces of the cable fixing member, respectively, are provided with an open front surface. A recess for housing the cable fixing member;
A cable lead-out hole that is formed in the housing corresponding to the cable insertion hole and through which the electric cable provided from the rear surface of the recess to the outside of the housing is inserted;
An elastic O-ring that is inserted between the electrical cable and disposed between the cable fixing member and the housing;
An engagement protrusion formed on at least one side surface of the cable fixing member and protruding toward one inner side surface of the recess;
The inner surface of the recess corresponding to the engagement protrusion is formed to be inclined along the inclined surface of the recess, and the engagement protrusion is slidably engaged to move the cable fixing member. A guide portion that guides to a locking position at the end of a slidable range of the engaging protrusion, and a locking portion that locks the engaging protrusion so as not to move when the cable fixing member is moved to the locking position. A slide groove having
Formed on the rear surface of the cable fixing member, and when the cable fixing member is moved toward the end of the slide groove, the O-ring is crushed and the O-ring forms a gap between the cable lead-out hole and the electric cable. And a holding unit to be buried,
When the cable fixing member slides toward the locking position, the engaging protrusion can move to the locking portion of the slide groove by bringing the inclined surface of the cable fixing member into contact with the inclined surface of the recess. The inclination of the inclined surface of the concave portion is configured to be larger than the inclination of the guide portion (claim 1).

  According to this configuration, when the inclined surface of the cable fixing member is brought into contact with the inclined surface of the concave portion on the housing side and the cable fixing member is slid toward the lock position, the guide portion of the slide groove and the concave portion are inclined. The gap with the surface is gradually reduced, and is fitted between the slide groove and the inclined surface of the recess at the end position of the guide portion. Further, when the cable fixing member is further slid inward from the end position of the guide portion and pushed in, the gap between the guide portion of the slide groove and the inclined surface of the recess is passed so as to press fit, and the engagement protrusion The cable fixing member can be moved to a lock position where the portion fits within the lock portion of the slide groove. When the cable fixing member is moved toward the end of the slide groove, the holding portion of the cable fixing member crushes the O-ring. The crushed O-ring fills the gap between the cable lead hole and the electric cable and provides a waterproof seal. Further, when the electric cable is pulled by receiving an external force, a part of the external force is received and buffered by the seal portion, and the external force can be protected from being directly applied to the cable fixing member side.

  As described above, when the cable fixing member is slid toward the lock position, the inclination angle of the slide groove and the inclination of the recess are such that the gap between the guide portion of the slide groove and the inclined surface of the recess gradually decreases. In a structure where the cable fixing member is fitted while sliding the guide part of the slide groove and the inclined surface of the concave part with different surface angles, the engaging protrusion part is moved from the terminal position of the slide part into the lock part. After that, since the slide groove does not return from the lock portion to the guide portion side, the cable fixing member can be held at the lock position.

  Further, it is preferable that the slide groove is provided on both left and right inner surfaces of the recess, and the engagement protrusion is provided on both the left and right side surfaces of the cable fixing member.

  According to this configuration, the cable fixing member engages the engagement protrusions provided on the left and right inner surfaces and the slide grooves provided on the left and right side surfaces in the recess, respectively, and the inclined surface of the cable fixing member and the recess Since the slanted surface is brought into contact and slides in the concave portion, the cable fixing member moves stably, and in the locked position, the O-ring is uniformly pressed from the holding portion and crushed, thereby providing a waterproof seal. Increase the force to hold and hold the electric cable.

  Further, it is preferable that the lock portion of the slide groove is formed continuously from the end position of the guide portion (claim 3).

  According to this configuration, a step is formed between the end position of the guide portion and the lock portion. For this reason, after the engagement protrusion is moved from the end position of the slide portion into the lock portion, it is further difficult for the engagement protrusion to return to the guide portion side of the slide groove.

  According to the present invention, the structure can be simplified by moving the cable fixing member to the lock position by sliding the inclined surface in the recess. In addition, it eliminates the effects of burrs produced during molding and airtightness created by poor finish of the mold, which has been a problem with conventional electric cable fixing structures, and improves waterproof performance and electric cable retention. Can do. Moreover, since the use of the anti-rotation plate or the like used in the conventional structure can be abolished, it can be expected that the cost can be reduced and provided at a low cost.

It is a perspective view of the vehicle-mounted camera apparatus which provided the electric cable fixing structure of this invention. It is an expansion schematic sectional drawing along the AA line of FIG. It is sectional drawing of a vehicle-mounted camera apparatus same as the above, (a) is a schematic sectional drawing along the BB line of FIG. 2, (b) is a schematic sectional drawing along the CC line of FIG. It is a figure explaining the structure which fixes a cable fixing member in a recessed part, (a) is a figure before fixing a cable fixing member in a recessed part, (b) is a figure after fixing a cable fixing member in a recessed part. is there. It is a figure explaining the structure where the holding | maintenance part of a cable fixing member crushes an O-ring, (a) is a figure before attaching a cable fixing member in a recessed part, (b) has fixed the cable fixing member in the recessed part. FIG. It is a figure explaining the effect | action when the inclination of the inclined surface of a recessed part and the inclination of the guide part of a slide guide groove differ, (a) makes the inclination of the inclined surface of a recessed part, and the inclination of the guide part of a slide guide groove the same. (B) and (c) are explanatory diagrams when the inclination of the inclined surface of the recess is formed larger than the inclination of the guide portion of the slide guide groove. It is sectional drawing of the vehicle-mounted camera apparatus to which the conventional electric cable fixing structure is applied. It is a disassembled perspective view of the vehicle-mounted camera apparatus shown in FIG. It is a perspective view which fractures | ruptures and shows a part of rear case of the vehicle-mounted camera apparatus shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. In the following description, expressions indicating directions such as up and down and left and right are not absolute, and are appropriate when each part of the in-vehicle camera device of the present embodiment is depicted in an orientation, When the posture changes, it should be interpreted according to the change in posture.

  1 to 5 show examples of an electric cable fixing structure according to an embodiment of the present invention, and FIG. 1 is a perspective view of an in-vehicle camera device shown as an example of an electronic apparatus to which the electric cable fixing structure is applied. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view of the on-vehicle camera device, FIG. 2A is a cross-sectional view taken along line BB in FIG. 2, and FIG. FIG. In the following description, the left and right direction left side of FIG. 2 will be described as the front-rear direction front and the right side as the rear side, the up-down direction is up and down, and the direction perpendicular to the page is the left and right.

  As shown in FIGS. 1 and 2, the in-vehicle camera device includes a front case 12a provided with an imaging lens portion 11 for introducing imaging light at a front portion, and a waterproof packing 13 (see FIG. 2) at the rear portion of the front case 12a. (See FIG. 1) and a rear case 12b fixed with screws 14 (see FIG. 1).

  As shown in FIG. 2, an imaging element 15a such as a CCD, a video circuit board 15b, and the like are housed in the front case 12a, and a cable lead-out hole 16 penetrating in the front-rear direction is provided in the rear part of the rear case 12b. ing.

  Then, a connector 18a is attached to the distal end, and a cable fixing member 20 and an O-ring 19 are attached to the rear of the connector 18a. From the rear end side where the ring 19 is attached, it passes through the cable lead-out hole 16 of the rear case 12b and is pulled out to the outside of the rear case 12b. Thereafter, inside the rear case 12b, the connector 18a attached to the tip of the electric cable 17 is connected to the connector 18b provided on the video circuit board 15b so that the electrical connection between the inside of the housing 12 and the outside can be achieved. The cable fixing member 20 and the O-ring 19 provided in the middle of the cable 17 are assembled and fixed to the rear case 12b as will be described later. This assembling procedure is appropriately changed.

  As described above, the O-ring 19 and the cable fixing member 20 attached to the middle portion of the electric cable 17 form the electric cable fixing structure of the present invention together with the later-described recess 21 formed in the rear case 12b. is there. That is, the middle portion of the electric cable 17 is fixed and held on the rear case 12b by the electric cable fixing structure. By this fixing, even if the electric cable 17 is pulled from the outside of the housing 12, it receives an external force at the fixing portion and suppresses the external force from being transmitted to the inside of the housing 12, thereby suppressing the video circuit board 15 b inside the housing 12. It is trying to eliminate the influence on.

  In addition, the electric cable 17 penetrating the cable lead-out hole 16 can freely move in the front-rear direction within the cable lead-out hole 16 before the connector 18a is connected to the connector 18b. Then, when the connector 18a is connected to the connector 18b and then the cable fixing member 20 is attached to the recess 21 of the rear case 12b, the electric cable 17 is fixed to the rear case 12b. Thereafter, the waterproof packing 13 is disposed between the front case 12a and the rear case 12b, and the front case 12a and the rear case 12b are fixed with screws 14 to be assembled as the in-vehicle camera device 10. is there.

  Next, an electric cable fixing structure including the O-ring 19, the cable fixing member 20, the recess 21 of the rear case 12b, and the like will be described in more detail with reference to FIGS.

  As shown in FIG. 4, the cable fixing member 20 includes a front surface 20a, a rear surface 20b, a left side surface 20c, a right side surface 20d, an upper surface 20e, a lower surface 20f, and an angle θ1 from the rear surface 20b to the lower surface 20f (see FIG. 2). This is a block-shaped resin molded member having an inclined surface 20g provided in an inclined manner.

  As shown in FIGS. 2 and 4, the cable fixing member 20 has a cable insertion hole 22 that penetrates from the front surface 20 a to the rear surface 20 b, and the electric cable 17 is attached to the cable insertion hole 22 through the cable insertion hole 22. Yes. In the present embodiment, when the cable fixing member 20 is molded, the electric cable 17 is placed in a mold and filled with a resin for forming the cable fixing member 20 to be integrated with the cable fixing member 20. The cable fixing member 20 is integrated by so-called insert molding.

  Further, as shown in FIGS. 3 and 4, the left and right side surfaces 20 c and 20 d of the cable fixing member 20 protrude to the outside (inner side surfaces 21 c and 21 d side of the recess 21) substantially perpendicularly to the left and right symmetrical positions. The boss to be formed, that is, the engaging projection 23 is integrally formed. As shown in FIG. 2, the distance from the upper surface to the lower surface 20f of the engaging protrusion 23 is set to W1.

  As shown in FIGS. 2 and 5B, the cable fixing member 20 has a cable insertion hole 22 at the center, and the holding portion 20h projects rearward (rear inner surface 21b side of the recess 21). Are integrally formed. In addition, the round shape is provided to the front-end | tip part of the holding | maintenance part 20h.

  As shown in FIGS. 2 to 4, the recess 21 that accommodates the cable fixing member 20 provided in the rear case 102 b is provided inside the housing 12, that is, on the inner surface side of the rear case 12 b. 20, a rear inner surface 21b corresponding to the rear surface 20b, a left side surface 21c corresponding to the left side surface 20c of the cable fixing member 20, and a right inner side surface 21d corresponding to the right side surface 20d of the cable fixing member 20. An upper inner surface 21e corresponding to the upper surface 20e of the cable fixing member 20, a lower inner surface 21f corresponding to the lower surface 20f of the cable fixing member 20, and a cable fixing member inclined from the rear inner surface 21b toward the lower inner surface 21f. 21 inclined surfaces 21g corresponding to 20 inclined surfaces 20g. As shown in FIG. 2, the inclination angle of the inclined surface 21 g is the same angle θ1 as that of the inclined surface 20.

  2, 4, and 5, the rear inner surface 21 b of the recess 21 penetrates from the recess 21 to the rear surface of the rear case 12 b corresponding to the cable insertion hole 22 of the cable fixing member 20. The cable lead-out hole 16 and an O-ring positioning recess 24 formed in a mortar shape so as to be inclined toward the center of the cable lead-out hole 16 are provided. The O-ring positioning recess 24 is configured so that the O-ring 19 can accommodate a part of the O-ring 19 for positioning. 5A, when the O-ring 19 is positioned and accommodated in the O-ring positioning recess 24, the O-ring 19 protrudes from the O-ring positioning recess 24 into the recess by a height H. As shown in FIG. Is set to

Further, as shown in FIGS. 2 to 5, the engagement protrusions 23 and 23 of the cable fixing member 20 are slidably engaged with the left and right inner side surfaces 20 c and 20 d of the recess 21 at symmetrical positions, respectively. A slide groove 25 is provided.
The slide groove 25 is formed by, for example, molding the two parts of the rear case 12b divided by the surface where each of the slide grooves 25 is opened into a mold including the slide groove 25, and bonding them with an adhesive or the like. It should be a method. By doing this,
The slide groove 25 can be formed on the inner side surfaces 20c and 20d of the recess 21 in the rear case 12b by molding.

  The slide groove 25 is engaged with the engagement protrusion 23, and the cable fixing member 20 is inserted into the recess 21 from the opening surface side, and FIG. 2, FIG. 3, FIG. 4 (b), FIG. The guide portion 25a that guides the movement to the position immediately before being accommodated (guide portion end position E), and the cable fixing member 20 exceeds the guide portion end position E to the lock position. And a locking portion 25b that locks the cable fixing member 20 so as not to move at the locked position.

  As shown in FIG. 2, the guide portion 25a of the slide groove 25 is formed at an inclination angle θ2 so as to extend substantially parallel to the inclined surface 21g from the opening surface of the recess 21 toward the rear inner surface 21b. The inclination angle θ2 is slightly smaller than the inclination angle θ1 of the inclined surface 21g. Further, at the starting end position S of the guide portion 25a, the distance of the perpendicular line hanging from the position of the one side surface 26 of the guide portion 25a onto the inclined surface 21g of the concave portion 21 is from the upper surface to the lower surface of the engaging projection portion 23 of the cable fixing member 20. The distance W1 is the same as the distance up to 20f.

  Then, due to the difference between the inclination angle θ2 of the guide portion 25a and the inclination angle θ1 of the inclined surface 21g, the inclined surface from the position of the one side surface 26 of the guide portion 25a at the starting end position S of the guide portion 25a as shown in FIG. The distance W2 is the distance W1 of the perpendicular W21 hanging on the inclined surface 21g from the position of the one side surface 26 of the guide portion 25a at the terminal position E of the guide portion 25a. Is set to be slightly smaller. The difference between the distance W1 and the distance W2 is that, on the opening side of the concave portion 21, the engagement protrusion 23 is engaged with the guide portion 25a and the cable fixing member 20 is directed toward the rear inner surface 21b, that is, toward the lock position. When the cable fixing member 20 is slid, the distance (gap) between the one side surface 26 of the guide portion 25a and the inclined surface 21g of the recess 21 increases from the distance W1 to the distance W2 as the cable fixing member 20 is slid. The cable fixing member 20 is fitted between the guide portion 25a and the inclined surface 21g in the immediate vicinity of the lock position. Further, when the cable fixing member 20 is further slid inwardly into the recess 21 against the fitting, it is moved to the lock position, that is, the lock portion 25b.

  The lock portion 25b is formed continuously from the end position E of the guide portion 25a toward the upper inner surface 21e, and a portion where the lock portion 25b is formed is defined as a lock position. The lock portion 25b provided at the lock position is slightly bent so as to continuously protrude from the terminal position E of the guide portion 25a toward the opening side of the concave portion 21, that is, the front side of the housing 12. Accordingly, a step 27 is formed between the guide portion 25a and the lock portion 25b as shown in FIGS.

  Next, the operation of the cable fixing structure configured as described above will be described. First, the connector 18a is attached to the tip, the electrical cable 17 having the cable fixing member 20 and the O-ring 19 attached to the rear of the connector 18a, and the cable lead-out hole 16 of the rear case 12b from the rear end side to which the O-ring 19 is attached. The other end of the electric cable 17 is pulled out of the housing 12. Next, the connector 18a attached to the tip of the electric cable 17 is connected to the connector 18b provided on the video circuit board 15b.

  Subsequently, the O-ring 19 on the electric cable 17 is slid toward the rear inner surface 21b of the recess 21 and positioned in the O-ring positioning recess 24 of the recess 21 as shown in FIG. In FIG. 5A, the cable fixing member 20 is not attached in the recess 21, the electric cable 17 is passed through the cable lead-out hole 16, and the O-ring 19 is positioned in the O-ring positioning recess 24. It is in the state that was done. In this state, the O-ring 19 protrudes into the recess 21 by the dimension H.

  Subsequently, as shown in FIG. 4A, the cable fixing member 20 on the electric cable 17 is disposed to face the concave portion 21 of the rear case 12b. Further, at the starting end position S of the left and right slide grooves 25, the left and right engaging projections 23, 23 are engaged with the guide portions 25a, 25a, respectively, and the cable fixing member 20 is moved toward the rear inner surface 21b, that is, toward the lock position. Slide towards you. At this time, the inclined surface 20g of the cable fixing member 20 is brought into contact with the inclined surface 21g of the concave portion 21, and the engaging protrusion 23 is brought into contact with one side surface 26 of the slide groove 25 and moves toward the lock position while sliding on each other. To do. Further, during this movement, the excess electric cable 17 disposed between the cable fixing member 20 and the rear inner surface 21b of the recess 21 is removed so as to be gradually pulled out of the rear case 12a.

  Further, when approaching the lock position, the distance (gap) between the one side surface 26 of the guide portion 25a and the inclined surface 21g of the concave portion 21 gradually decreases toward W2, so that the cable fixing member 20 is one side surface 26 of the guide portion 25a. Is gradually fitted between the inclined surface 21g of the recess 21 and a large pressing force is required, but if the cable fixing member 20 is further pressed inwardly into the recess 21, it moves to the lock position (lock portion 25b). Can be made. When the cable fixing member 20 moves to the terminal end of the cable groove 25, the holding portion 20h of the cable fixing member 20 is disposed on the O-ring 19, and the O-ring 19 is crushed toward the rear inner surface 21b.

  Further, the O-ring 19 that is crushed by the holding portion 20h of the cable fixing member 20 is crushed and expanded in the O-ring positioning recess 24, and as shown in FIGS. The cable 17 is in close contact with each other, and the gap between the cable drawing hole 16 and the electric cable 17 and the gap between the electric cable 17 and the O-ring 19 are respectively closed and sealed. Thereby, the waterproofing in the location of the cable extraction hole 16 is achieved. Further, the external force applied to the electric cable 17 is received by the portion of the cable fixing member 20 integrated with the electric cable 17, and the external force is protected from being directly applied to the connection portion with the video circuit board 15.

  Therefore, in the cable fixing structure in the present embodiment, the cable fixing member 20 is slid on the inclined surface 20g in the recess 21 and moved to the lock position, thereby causing a problem in the conventional electric cable fixing structure. The waterproof performance and the holding power of the electric cable can be improved by eliminating the influence on the burr produced at the time of molding and the airtightness produced by the defective finish of the mold.

  Moreover, since the use of the anti-rotation plate or the like used in the conventional structure can be abolished, effects such as simplification of the structure, reduction in cost, and provision at a low cost can be expected.

  Further, the O-ring 19 crushed by the holding portion 20h gives a force for pushing the cable fixing member 20 to the lock position side by the restoring force P as shown in FIG. This restoring force P, together with the step 27, makes it difficult for the engaging projection 23 of the cable fixing member 20 arranged at the lock position to return from the lock portion 25b to the guide portion 25a side, so that the cable fixing member 20 is reliably brought to the lock position. Thus, the reliability of fixing to the electric cable 17 is improved.

  Further, in the cable fixing structure of the present embodiment, the inclination θ1 of the inclined surface 21g of the recess 21 is formed larger than the inclination θ2 of the guide portion 25a of the slide guide groove 25, so that the guide portion 25a changes to the lock portion 25b. It is possible to prevent the moved engagement protrusion 23 from returning from the lock portion 25a to the guide portion 25a side, and to reliably maintain the cable fixing member 20 in the locked state. This operation will be described next with reference to the schematic diagram shown in FIG.

  6A is a view when the inclination θ1 of the inclined surface 21g of the recess 21 and the inclination θ2 of the guide portion 25a of the slide guide groove 25 are the same, and FIGS. 6B and 6C are views of the recess 21. FIG. FIG. 6 is a view when the inclination θ1 of the inclined surface 21g is formed larger than the inclination θ2 of the guide portion 25a of the slide guide groove 25.

  As shown in FIG. 6A, when the inclination θ1 of the inclined surface 21g of the concave portion 21 and the inclination θ2 of the guide portion 25a of the slide guide groove 25 are the same, the inclined surface starts from the position of one side surface 26 of the guide portion 25a. The distance to 21g is the same as the distance from the start position to the end position E of the guide portion 25a. Therefore, even if the cable fixing member 20 is slid toward the terminal position E of the guide portion 25a, the engagement protrusion 23 can be moved from the guide portion 25a to the lock portion 25b without being press-fitted. it can. And after moving to the lock part 25b, the cable fixing member 20 is pushed to the lock position side in the lock part 25b by the distance L1 by the restoring force P of the O-ring 19 crushed by the holding part 20h. The engagement protrusion 23 is pushed into the lock portion 25b by the restoring force P. In FIG. 6A, the position of the cable fixing member 20 indicated by a solid line indicates the position immediately after being moved from the guide portion 25a into the lock portion 25b, and the position indicated by a dotted line indicates the position within the guide portion 25a. The lock position is moved into the lock portion 25b and then moved by the distance L1 by the restoring force P of the O-ring 19.

  However, in this structure, the O-ring 19 is moved by the distance L1 as the cable fixing member 20 is pushed into the lock portion 25b, and the gap between the cable lead-out hole 16 and the electric cable 17 and the electric cable 17 and the O cable 19 are increased. The force of closing and sealing each gap between the rings 19 is weakened. Further, the restoring force P due to the O-ring 19 holding the engaging protrusion 23 in the lock portion 25b is also weakened, and the cable fixing member 20 is arranged in the guide portion in a state where the cable fixing member 20 is disposed at the lock position. When pulled to the 25a side, the engaging protrusion 23 may return from the lock portion 25b to the guide portion 25a. In FIG. 6A, an engagement protrusion 23 indicated by a two-dot chain line indicates an engagement protrusion returned from the lock portion 25b to the guide portion 25a.

  On the other hand, the inclination θ1 of the inclined surface 21g of the concave portion 21 is set to be larger than the inclination θ2 of the guide portion 25a of the slide guide groove 25 as in the structure of the present embodiment shown in FIGS. When the cable fixing member 20 is formed to be large, when the cable fixing member 20 is slid toward the terminal position E of the guide portion 25a, the cable fixing member 20 gradually moves to the slide groove 25 side, and the guide portion 25a of the engaging protrusion 23 is formed. From the position to the lock portion 25b, it is forced to push and move. 6 (b) and 6 (c), the position of the cable fixing member 20 indicated by a solid line indicates the position immediately after being moved from the guide portion 25a to the lock portion 25b, and the position indicated by a dotted line is The lock position is shown in which it is moved from the guide portion 25a into the lock portion 25b and then moved by the distance L2 by the restoring force P of the O-ring 19. A one-dot chain line indicates the position of the guide portion 25a of the slide guide groove 25 when the inclination θ2 of the guide portion 25a of the slide guide groove 25 is the same as the inclination θ1 of the inclined surface 21g of the recess 21. That is, in FIGS. 6B and 6C, the inclination θ1 of the inclined surface 21g of the recess 21 in FIG. 6A is the same, and the inclination θ2 of the guide portion 25a of the slide guide groove 25 is set as shown in FIG. Is shown in a state of being smaller than the inclination θ2 of the guide portion 25a of the slide guide groove 25 in FIG.

  Then, after being moved to the lock portion 25b as shown in FIG. 6B, the cable fixing member 20 is moved to the lock position side by the distance L2 by the restoring force P of the O-ring 19 crushed by the holding portion 20h. The engaging projection 23 is pushed into the lock portion 25b by the restoring force P. In this case, the distance L2 that the cable fixing member 20 moves to the lock position side in the lock portion 25b is shown in FIG. 6A by the amount that the cable fixing member 20 has already been moved to the slide groove 25 side. The distance may be smaller than the distance L1. Accordingly, the distance that the cable fixing member 20 moves by being pushed into the lock portion 25b is a distance L2 that is smaller than the distance L1 of the structure described in FIG. The force for closing and sealing the gap between the electric cable 17 and the gap between the electric cable 17 and the O-ring 19 is larger than that in the case of the structure described with reference to FIG. Further, the restoring force P holding the engaging projection 23 in the lock portion 25b is also increased, so that the looseness of the engagement projection 23 in the lock portion 25b can be kept small, and FIG. As shown in FIG. 5, the engagement protrusion 23 is moved from the lock portion 25b to the guide portion 25a by the large restoring force P, the step 27, and the entrance (end position E of the guide portion 25a) from the lock portion 25b to the guide portion 25a. Therefore, the cable fixing member 20 can be securely held at the lock position. An engagement protrusion 23 indicated by a two-dot chain line in FIG. 6C indicates an engagement protrusion in a state where it is prevented from returning from the lock portion 25b to the guide portion 25a.

  In the above embodiment, the case of the in-vehicle camera device has been described as the electronic device. However, the present invention is not limited to this in-vehicle camera device, and can be widely applied to general electronic devices. Moreover, although the structure which provided the engagement protrusion part 23 and the slide groove | channel 25 on both right and left sides was disclosed, it is good also as a structure provided only in one side. Furthermore, even if the electric cable 17 is not integrated with the cable fixing member 20 by insert molding, the electric cable 17 may be inserted later into the cable insertion hole 22 provided in the cable fixing member 20 in advance. It is. Further, modifications, improvements and the like within the scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 10 In-vehicle camera apparatus 12 Case 12a Front case 12b Rear case 16 Cable extraction hole 17 Electric cable 19 O-ring 20 Cable fixing member 20a Front surface 20b Rear surface 20c Left side surface 20d Right side surface 20e Upper surface 20f Lower surface 20g Inclined surface 20h Holding part 21 Recessed part 21a Opening surface 21b Rear inner surface 21c Left inner surface 21d Right inner surface 21e Upper inner surface 21f Lower inner surface 21g Inclined surface 22 Cable insertion hole 23 Engaging projection 24 O-ring positioning recess 25 Slide groove 25a Guide portion 25b Lock portion 26 One of the slide grooves Side surface 27 Step θ1 Inclination angle θ2 of inclined surfaces 20g and 21g Inclination angle of guide portion 25a

Claims (3)

An electric cable fixing structure for fixing an electric cable for connecting between a circuit board disposed in the case and an external power source to the case,
A front and rear, left and right, upper and lower surfaces, and a cable fixing member to which the electric cable is attached, and an inclined surface inclined from the rear surface toward the lower surface,
The rear surface, the left and right side surfaces, the upper and lower surfaces, and the inclined surfaces that are formed in the housing and correspond to the surfaces and the inclined surfaces of the cable fixing member, respectively, are provided with an open front surface. A recess for housing the cable fixing member;
A cable lead-out hole that is formed in the housing corresponding to the cable insertion hole and through which the electric cable provided from the rear surface of the recess to the outside of the housing is inserted;
An elastic O-ring that is inserted between the electrical cable and disposed between the cable fixing member and the housing;
An engagement protrusion formed on at least one side surface of the cable fixing member and protruding toward one inner side surface of the recess;
The inner surface of the recess corresponding to the engagement protrusion is formed to be inclined along the inclined surface of the recess, and the engagement protrusion is slidably engaged to move the cable fixing member. A guide portion that guides to a locking position at the end of a slidable range of the engaging protrusion, and a locking portion that locks the engaging protrusion so as not to move when the cable fixing member is moved to the locking position. A slide groove having
Formed on the rear surface of the cable fixing member, and when the cable fixing member is moved toward the end of the slide groove, the O-ring is crushed and the O-ring forms a gap between the cable lead-out hole and the electric cable. And a holding unit to be buried,
When the cable fixing member slides toward the locking position, the engaging protrusion can move to the locking portion of the slide groove by bringing the inclined surface of the cable fixing member into contact with the inclined surface of the recess. And the inclination of the inclined surface of the said recessed part was comprised so that it might become larger than the inclination of the said guide part, The electric cable fixing structure characterized by the above-mentioned.   2. The electric cable fixing structure according to claim 1, wherein the slide groove is provided on both left and right inner side surfaces of the recess, and the engagement protrusion is provided on both left and right side surfaces of the cable fixing member.   The electric cable fixing structure according to claim 1, wherein the lock portion of the slide groove is formed continuously from the end position of the guide portion.

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