JP2010221765A - Onboard equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress vibrations accompanied with vehicle vibrations, and to reduce manufacturing cost, in an onboard equipment mounted to a vehicle by using a bracket. <P>SOLUTION: A projecting strip portion is provided around a fixing part in a surface including a fixing part of the bracket of a case storing a circuit board and fixing the bracket to be mounted to a vehicle on an outer surface, of the onboard equipment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle device attached to a vehicle using a bracket.

  As an in-vehicle device attached to a vehicle using a bracket, for example, Patent Document 1 discloses an ETC (registered trademark) on-board device attached to an attachment portion of an instrument panel of a vehicle using an attachment portion (bracket). Yes.

  In the ETC vehicle-mounted device disclosed in Patent Document 1, the side surface of the case constituting the vehicle-mounted device is flat, and a bracket is fixed to a part of the side surface (see FIG. 13 and the like).

JP 2008-1000067 A

  In an in-vehicle device that is attached to a vehicle using a bracket, such as the above-mentioned ETC on-vehicle device, a case where the case and the bracket constituting the in-vehicle device are opposed to each other by screw fastening (screwing), fitting, press-fitting, welding, or the like. A method of fixing the site is adopted.

  However, if the fixing part (fixing point) between the case and the bracket is reduced (for example, fixing with two screws), the vehicle-mounted device vibrates using the fixing part as a power point as the vehicle vibrates, and the bracket and the case contact each other. There is a risk that abnormal noise will occur. In addition, the accumulation of the contact may deteriorate the case and the like, and the in-vehicle device may not operate normally.

  On the other hand, although it is conceivable to increase the number of fixing parts, such a method increases the number of work steps for fixing the bracket to the case, which may increase the manufacturing cost.

  In view of the above-described problems, an object of the present invention is to suppress vibration associated with vehicle vibration and reduce manufacturing cost in an in-vehicle device attached to a vehicle using a bracket.

  In order to achieve the above object, an invention according to claim 1 is an in-vehicle device provided with a circuit board and a case in which the circuit board is housed and a bracket for mounting on a vehicle is fixed on the outer surface. Then, the case is characterized in that a convex or concave step portion is provided around the fixing portion in the plane including the fixing portion of the bracket.

  In the present invention, the convex or concave stepped portion is provided in the surface including the fixing portion of the bracket in the case, so that the surface including the fixing portion in the case with respect to the bending stress due to vibration is compared with the configuration without the stepped portion. Yield strength, in other words, bending rigidity (mechanical strength against bending) can be improved.

  Even if vehicle vibrations act on the fixed part of the case via the bracket, the stepped part is located near the fixed part. Generation of abnormal noise due to contact can be suppressed.

  In addition, vibration of the in-vehicle device can be suppressed without increasing the fixing part (fixing point) between the case and the bracket, thereby suppressing an increase in work man-hours for fixing the bracket to the case, and thus manufacturing costs. Can be reduced.

  As the in-vehicle device, any of a state where the bracket is not fixed to the case and a state where the bracket is fixed to the case according to claim 2 can be adopted.

  The stepped portion may be configured to be one step convex or concave in the thickness direction of the case. However, when a stepped portion having a multistage structure (for example, two steps) is employed as described in claim 3, The bending rigidity can be further improved compared to the step.

  According to a fourth aspect of the present invention, in the configuration in which two fixing portions are provided only in one surface of the case, the fixing portion is provided so as to include a part of the opposing region of the two fixing portions, and 2 It is preferable to employ a stepped portion having a structure that is long in a direction connecting two fixed portions.

  When the step portion has the above-described structure (for example, a flat rectangular shape that is long in a direction connecting two fixing parts), in a configuration having two fixing parts in the same plane of the case, a direction connecting two fixing parts It is possible to improve the yield strength against bending stress caused by vibration (that is, the longitudinal direction in the case of a plane rectangle), that is, the bending rigidity in the direction connecting two fixed portions. And thereby, the vibration of the vehicle equipment which made the fixed part the power point can be suppressed effectively.

  Especially, as described in claim 5, when the stepped portion has a linear structure along a direction connecting two fixed portions, and the planar shape of the stepped portion along the surface including the fixed portion is rectangular. Is preferably configured such that the fixed portion is sandwiched between two diagonal lines of a stepped portion having a planar rectangular shape and is located within a range adjacent to the longitudinal end of the stepped portion.

  According to this, the bending rigidity in the longitudinal direction can be improved by the step portion, and the bending rigidity in the lateral direction can also be improved. Therefore, even when bending stress due to vibration in the short-side direction acts, the effect of the step portion can suppress deformation of the case such as torsion, and consequently suppress the generation of abnormal noise due to contact between the case and the bracket. it can.

  According to a sixth aspect of the present invention, the case includes two case members that can be divided in the thickness direction of the circuit board, and two edge parts that surround the circuit board in the case member are opposed to each other. In a configuration in which a plurality of fixing portions for fixing two case members to each other are provided, the direction perpendicular to the thickness direction of the circuit board in the two case members in a direction connecting the plurality of fixing portions at one edge portion. It is preferable that the fixing portion and the stepped portion provided on one side of the surface be positioned between any two fixing portions of the plurality of fixing portions.

  In the present invention, since the step portion is located between any two fixed portions, the rigidity between the fixed portions in the case can be improved. Therefore, the deformation of the case between the fixed parts due to vehicle vibration and the fluctuation of the case due to the variation in the fixed state at each fixed part due to the vehicle vibration are suppressed, and consequently the generation of noise due to the contact between the case and the bracket is suppressed. can do.

  The two fixed portions adjacent to each other at one edge, and the two fixed portions corresponding to the two fixed portions and adjacent to each other at the other edge, of the edges facing each other. In the configuration in which the distance between the two fixed portions in the direction of connecting the fixed portions is different, the reinforcing first rib is provided in parallel at the edge between the two fixed portions on the longer distance side. It is good to have a configuration.

  Due to restrictions such as the wiring pattern on the circuit board and the mounting position of the electronic component, it may be necessary to adopt a configuration in which the distance between two adjacent fixed parts is different at two opposing edges. In such a case, if the first rib for reinforcement is provided between the two fixed portions on the longer distance side, the deformation of the case between the fixed portions due to vehicle vibration can be effectively suppressed.

  As described in claim 8, the first rib is provided so as to straddle at least one end of the bracket in a state in which the bracket is fixed to the case in a direction in which the fixing portion is connected. Then it is better.

  As the vehicle vibrates, the bracket vibrates using a portion fixed to the case as a power point, and therefore, the end of the bracket may come into contact with the case to generate abnormal noise. On the other hand, in the present invention, since the first rib is provided across the end of the bracket, the case and the bracket follow and vibrate due to the effect of improving the rigidity by the first rib. Thereby, generation | occurrence | production of the noise by contact with a case and a bracket can be suppressed more effectively.

  On the other hand, as described in claim 9, the case extends along the surface having the fixing portion, and for reinforcing the gap of the stepped portion so as to connect the opposing long sides of the stepped portion of the planar rectangle. It is preferable to have a configuration having the second rib.

  According to this, the bending rigidity in the transversal direction of the planar rectangular stepped portion can be improved by the second rib. In particular, as described in claim 10, when the second rib has a shape extending along the short direction of the stepped portion of the flat rectangular shape, the bending rigidity in the short direction is further improved by the second rib. be able to.

  As described in claim 11, the case is provided with a plurality of second ribs for one stepped portion, and the plurality of second ribs are arranged symmetrically with respect to the center line in the longitudinal direction of the stepped portion. With this configuration, it is possible to evenly distribute the vibration force received by the fixed portion via the bracket to the second ribs as the vehicle vibrates. Thereby, it is possible to suppress the generation of a specific vibration mode, for example, abnormal resonance (vibration anisotropy).

  In the above-described invention, as described in claim 12, it is preferable to adopt a configuration in which the bracket is fixed to the case by screw fastening, and the fixing portion of the case is provided with a screw hole. According to this, workability | operativity at the time of attaching an in-vehicle apparatus to a vehicle or mounting and changing an in-vehicle apparatus can be improved.

  The above-mentioned in-vehicle device is particularly suitable for a small-sized in-vehicle device, for example, an ETC in-vehicle device used in an ETC system (Electronic Toll Collection system) as described in claim 13.

It is a perspective view which shows schematic structure of the ETC onboard equipment which concerns on 1st Embodiment. It is the perspective view which showed the ETC onboard equipment shown in FIG. It is a disassembled perspective view which shows each component of the ETC onboard equipment shown in FIG. It is a perspective view which shows the structure of the outer surface side of a lower case. It is sectional drawing which follows the VV line of FIG. It is a top view which shows the positional relationship of the screw hole for fixation and a protruding item | line part. It is a perspective view which shows the structure of the inner surface side of a lower case. It is a perspective view which shows schematic structure of a bracket. It is a perspective view which shows the state which fixed the bracket to the lower case.

(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration of the ETC vehicle-mounted device according to the first embodiment. FIG. 2 is a perspective view showing the ETC vehicle-mounted device shown in FIG. FIG. 3 is an exploded perspective view showing each component of the ETC vehicle-mounted device shown in FIG. FIG. 4 is a perspective view showing the configuration of the outer surface side of the lower case. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a plan view showing a positional relationship between the fixing screw hole and the protruding strip portion. FIG. 7 is a perspective view showing the configuration of the inner surface side of the lower case. FIG. 8 is a perspective view showing a schematic configuration of the bracket. FIG. 9 is a perspective view showing a state in which the bracket is fixed to the lower case.

  In the following, an ETC vehicle-mounted device used in an ETC system is shown as an example of the vehicle-mounted device. Further, the longitudinal direction of the substantially rectangular ridges is simply the longitudinal direction, the short direction of the ridges is simply the short direction, and the thickness direction of the circuit board is simply the thickness direction.

  The ETC vehicle-mounted device 10 shown in FIG. 1 is fixed to the outer surface of the case 12 to attach the ETC vehicle-mounted device 10 to the vehicle as a main part, a circuit board 11, a case 12 that houses the circuit board 11 inside, And a bracket 13 as an attachment member.

  In the present embodiment, in addition to the above components, as shown in FIG. 1, a screw 14 for configuring the case 12, a screw 15 for fixing the bracket 13 to the case 12, an indicator 16 such as a power source or an error, An operation SW 17 for confirming a history, a speaker 18 for notifying an occupant, a speaker 18 and a sound emitting hole of an opposing case 12 (upper case 30) are arranged so as to secure sound pressure and the like. An annular rubber bush 19, a holder 20 for holding the speaker 18 mounted on the circuit board 11, a card connector 21 for inserting and holding an ETC card, an ejector 22 for taking out the ETC card, and the like. Yes. Below, the point regarding the principal part of the ETC onboard equipment 10, especially the characteristic part comprised in the lower case 40 is demonstrated in detail, and it abbreviate | omits about other description.

  The circuit board 11 has a wiring pattern arranged on a well-known insulating base made of a thermoplastic resin, a thermosetting resin, ceramic, a composite of glass (for example, glass cloth) and a synthetic resin, etc., and includes a microcomputer, a power transistor, a resistor In addition, electronic parts such as capacitors are mounted. In the present embodiment, as shown in FIG. 1, the planar shape substantially perpendicular to the thickness direction is substantially rectangular, and a high-profile component such as an aluminum electric field capacitor or a speaker 18 is mounted on the one surface 11a side. A card connector 21 is arranged on the back side of 11a.

  The case 12 is composed of a plurality of members formed by molding a synthetic resin material so as to form an internal space and accommodate the circuit board 11 in the internal space. In the present embodiment, the case 12 is formed with a substantially uniform thickness over almost the entire region, and is configured by assembling two cases 30 and 40 configured to be splittable in the thickness direction. More specifically, the case 12 is configured by assembling the two cases 30 and 40 by fitting and fastening with the screw 14.

  The upper case 30 is a part mainly constituting an upper side portion of the case 12 that faces the one surface 11a of the circuit board 11, opens to the lower case 40 side, and has a box shape deeper than the lower case 40 in the thickness direction. It is said that. The planar shape of the box-shaped bottom 31 is substantially rectangular corresponding to the circuit board 11. The outer surface 31 a of the bottom portion 31 forms the upper surface of the outer surface of the case 12.

  Further, a planar annular side wall portion 32 is integrally provided at the edge portion on the inner surface of the bottom portion 31 so as to extend from the inner surface so as to surround the opening. As shown in FIG. 1, the indicator 16, the operation SW 17, the card insertion slot of the card connector 21, the ejector 22, and the like are provided on one side of the annular side wall 32 corresponding to the short side of the planar rectangle. An opening for exposure to the outside is provided.

  In addition, two side wall portions 32 corresponding to the long sides of the planar rectangle among the side wall portions 32 are provided with two groove portions (not shown) for fitting with the lower case 40 for each side wall portion. The groove is provided corresponding to protrusions 55a, 55b, 56a, and 56b of the lower case 40 described later. Further, the bottom portion 31 of the upper case 30 has a screw thread of the screw 14 near both corners of the side wall portion 32 corresponding to the short side opposite to the ETC card insertion side and the side wall portion 32 corresponding to the long side. A hole (not shown) is provided corresponding to the screw hole 44 of the lower case 40. These grooves and screw holes (not shown) correspond to the fixing portion (upper case 30 side) described in the claims.

  Next, the lower case 40 including the characteristic part according to the present embodiment will be described. The lower case 40 is a part mainly constituting a lower part of the case 12 facing the card connector 21 disposed on the back surface of the one surface 11a of the circuit board 11, and the bottom 41 of the lower case 40 is also shown in FIG. As shown, the planar shape is substantially rectangular corresponding to the circuit board 11. The outer surface 41 a of the bottom portion 41 forms the lower surface of the outer surface of the case 12.

  Further, as shown in FIG. 7, among the edges on the inner surface 41 b of the bottom 41, a portion corresponding to one short side of the planar rectangle and a portion corresponding to two long sides of the planar rectangle are connected to each other. A substantially U-shaped side wall 42 extending in a substantially vertical direction from the inner surface is integrally provided at the edges of the substantially U-shaped three sides. Of the edge portion, the portion corresponding to the remaining short side of the planar rectangle is substantially flush with the inner surface 41b of the bottom portion 41 (extending from the inner surface 41b of the bottom portion 41). As described above, the lower case 40 has a dust-like shape in which the opposing surface of the bottom 41 and a part of the side wall 42 are opened.

  In the lower case 40, a finger guard recess 43 is formed at the center of the edge of the short side where the side wall 42 is not provided. What is the short side where the finger guard recess 43 is formed? In the vicinity of both corners of the side wall portion 42 corresponding to the opposite short side and the side wall portion 42 corresponding to the long side, screw holes 44 of the screw 14 are provided through the bottom portion 41.

  Next, a part of the lower case 40 on the outer surface 41a side will be mainly described. For example, as shown in FIG. 4, a fixing screw hole 45 forming a pair for fixing the bracket 13 is provided on the bottom 41 of the lower case 40 so as to open to the outer surface 41 a side. In the present embodiment, the two fixing screw holes 45 that form a pair are opened only on the outer surface 41a of the bottom portion 41, and the longitudinal sides of the long side are substantially coincident with the longitudinal direction. One each is provided in the vicinity of both side wall portions 42 corresponding to. As described above, in this embodiment, two fixing screw holes 45 as fixing portions are provided only in one surface (upper surface) of the case 12.

  A convex ridge 46 is provided on the outer surface 41 a side around the fixing screw hole 45 in the bottom 41 of the lower case 40. In the present embodiment, for example, as shown in FIG. 5, the ridge 46 is one step higher than the reference portion and approximately parallel to the reference portion with respect to the portion of the outer surface 41 a around the ridge 46. A two-stage structure having a step portion 46a and a second step portion 46b that is one step higher than the first step portion 46a and substantially parallel to the reference portion. The reference part and the first stage part 46a, the first stage part 46a and the second stage part 46b are respectively connected by a connection part substantially perpendicular to the reference part. The height of the first stage portion 46a with respect to the reference portion is substantially equal to the height of the second stage portion 46b with respect to the first stage portion 46a.

  Further, for example, as shown in FIG. 6, the ridge 46 is provided so as to include a part of the opposing region of the two fixing screw holes 45 and has a linear structure extending along the longitudinal direction. . That is, the planar shape of the ridge 46 along the outer surface 41a, specifically, the outer shape of the first stage portion 46a and the outer shape of the second step portion 46b are rectangular. The two fixing screw holes 45 are in the vicinity of both ends of the ridge 46, more specifically, two diagonal lines (broken lines) of the first step portion 46a of the planar rectangular ridge 46 with respect to such a ridge 46. ) And is located within the range adjacent to the longitudinal end of the ridge 46 (within the range indicated by the dashed arrow).

  Further, in the vicinity of the fixing screw hole 45 on the outer surface 41a of the bottom portion 41, for example, as shown in FIG. 4, a pair of positioning projections 47 for positioning the bracket 13 is provided on the outer surface 41a (the above-mentioned reference portion). ) To protrude from. In the present embodiment, the two positioning projections 47 that form a pair are arranged in the vicinity of the side wall portions 42 corresponding to the longitudinal sides so that the direction in which the positioning projections 47 are connected substantially coincides with the longitudinal direction. Each one is provided. In the present embodiment, as shown in FIG. 6, the positioning projection 47 is also adjacent to both ends of the ridge 46, specifically, two diagonal lines (a first step portion 46 a of the planar rectangular ridge 46 ( It is located within a range (within the range indicated by a broken line arrow) that is sandwiched between broken lines) and adjacent to the longitudinal end of the ridge 46.

  Further, in the present embodiment, the fixing screw hole 48, the convex strip portion 49, and the positioning projection portion 50 having the same configuration as the fixing screw hole 45, the convex strip portion 46, and the positioning projection portion 47 are short. In the direction, the fixing screw hole 45, the ridge 46, and the positioning projection 47 and the screw hole 44 are provided on the outer surface 41 a of the bottom 41. That is, in the present embodiment, the bracket 13 includes the fixing screw hole 45, the convex strip portion 46, and the positioning projection 47 side, and the fixing screw hole 48, the convex strip portion 49, and the positioning projection portion 50 side. The fixed position of can be changed. However, it may be configured to have only the fixing screw hole 45, the ridge 46, and the positioning projection 47.

  Of the fixing screw holes 45 and 48 (parts on the outer surface 41a side), the side on which the bracket 13 is fixed corresponds to the fixing part of the bracket 13 described in the claims, and the ridges 46 and 49. Of these, the side on which the bracket 13 is fixed corresponds to the stepped portion described in the claims. In the present embodiment, the fixing screw hole 45 corresponds to a fixing portion of the bracket 13, and the protruding strip portion 46 corresponds to a step portion described in the claims.

  Next, a part of the lower case 40 on the inner surface 41b side will be mainly described. On the inner surface 41 b side of the lower case 40, as shown in FIG. 7, gaps 51 and 53 are formed corresponding to the ridges 46 and 49, respectively. As described above, the gaps 51 and 53 are due to the case 12 being molded with a substantially uniform thickness over almost the entire region. In the present embodiment, the planar shape along the inner surface 41b is the ridge 46. , 49 are long rectangles in the longitudinal direction.

  The plane rectangular gaps 51 and 53 are divided into a plurality of regions by ribs 52 and 54 that extend along the inner surface 41b and connect the opposing long sides of the plane rectangular ridges 46 and 49. . The ribs 52 and 54 are set such that the length (width) in the longitudinal direction is shorter than the length in the short direction. In the present embodiment, a plurality of ribs 52 and 54 are provided for the gaps 51 and 53, and the ribs 52 and 54 extend along the short direction. In addition, a plurality of ribs 52 and 54 are arranged symmetrically with respect to the center line in the longitudinal direction with respect to the respective gaps 51 and 53 (projection strips 46 and 49). The ribs 52 and 54 correspond to the second rib described in the claims.

  Of the substantially U-shaped side wall portions 42 provided on the edge of the inner surface 41 b of the bottom portion 41, the side wall portions 42 a and 42 b corresponding to the long sides are fitted with the grooves of the upper case 30. The fitting projections 55a, 55b, 56a, and 56b are integrally provided while projecting upward from the end surfaces of the side walls 42a and 42b. That is, two pairs of the fitting projection 55a and the fitting projection 55b, and the fitting projection 56a and the fitting projection 56b are provided on the side wall portions 42a and 42b facing each other.

  As described above, the lower case 40 as a fixing portion that fixes the upper case 30 and the lower case 40 to each other is provided on the lower case 40 with the fitting protrusions 55a (fitting protrusions) from the side of the finger guard recess 43 in the short direction. 55b), a fitting protrusion 56a (fitting protrusion 56b), and a screw hole 44 (screw hole 44). Then, the fixing screw hole 45, the protruding strip portion 46, and the positioning projection 47 are provided between the fitting projection 55a (fitting projection 55b) and the fitting projection 56a (fitting projection 56b). positioned. Further, the fixing screw hole 45, the convex strip portion 46, and the positioning projection 47 are positioned between the fitting protrusion 55 a (fitting protrusion 55 b) and the screw hole 44. That is, in the short direction, the fixing screw hole 45, the protruding strip portion 46, and the positioning protrusion 47 are a plurality of fixing protrusions 55a (fitting protrusions 55b) and fitting protrusions. It is located between any two fixed portions of 56a (fitting protrusion 56b) and screw hole 44 (screw hole 44).

  Further, in the present embodiment, due to the restriction of the circuit board 11, the side walls 42 b facing each other, along the short direction between the fitting protrusion 55 a and the fitting protrusion 56 a provided on one of the side walls 42 b. The length along the short direction between the fitting projection 55b and the fitting projection 56b provided on the other side wall 42b is longer than the length. Further, reinforcing ribs 57 are juxtaposed to the side wall portion 42b positioned between the fitting projection 55b and the fitting projection 56b on the longer side. The rib 57 corresponds to a first rib described in the claims.

  In the present embodiment, as shown in FIG. 9, the rib 57 is an end of the bracket 13 on the side far from the vehicle mounting portion 62 in the short direction with the bracket 13 fixed to the lower case 40 (case 12). It is provided so as to straddle the part 61a. The code | symbol 57a shown in FIG. 9 has shown the edge part of the rib 57 by the side of the screw hole 44 in a transversal direction.

  7 indicates a bottom portion of the fixing screw hole 45, and reference numeral 48 a indicates a bottom portion of the fixing screw hole 48. The rib 57 described above is provided with a finger protection recess 43 in the short-side direction. The side end is connected to the bottom of the fixing screw hole 45.

  Next, the bracket 13 will be described. As described above, the bracket 13 is an attachment member for attaching the ETC vehicle-mounted device 10 to the vehicle. In this embodiment, the bracket 13 is fixed to the outer surface of the case 12, specifically, the outer surface 41 a of the lower case 40. Further, a plate-like case fixing portion 60 which is formed by processing a metal plate mainly by press molding or the like and is arranged to face the outer surface 41a of the lower case 40, and is bent substantially perpendicular to the case fixing portion 60. And a vehicle attachment portion 62 that is bent substantially perpendicular to the connection portion 61 in a direction away from the lower case 40 and connected to the case fixing portion 60 via the connection portion 61. Yes. In addition, in the state fixed to the lower case 40, the case fixing part 60 of the bracket 13 is substantially parallel to the outer surface 41a of the bottom part 41, and the connecting part 61 is substantially the same as the side wall part 42 (42a, 42b) corresponding to the long side. It becomes parallel and the vehicle attachment part 62 becomes substantially parallel with the side wall part 42 corresponding to a short side.

  The case fixing portion 60 is a length that straddles the long side of the outer surface 41a of the bottom portion 41 of the planar rectangle so that the connecting portions 61 on both end sides are respectively disposed in the vicinity of the corresponding side wall portions 42a and 42b of the lower case 40. Have In the present embodiment, for example, as shown in FIG. 8, the case fixing portion 60 has a long rectangle in the longitudinal direction, and the length along the longitudinal direction is in the longitudinal direction of the outer surface 41 a of the bottom 41 of the lower case 40. It is almost the same as the length along or slightly longer. And the opening part 63 corresponding to the convex part 46 (convex part 49) is provided in the center site | part among the planar rectangular case fixing | fixed part 60. FIG. In addition, from the opening 63, for example, the peripheral portion 63a of the opening 63 is the periphery of the first step portion 46a and the protruding portion 46 so that only the second step portion 46b of the protruding portion 46 is exposed to the outside. It has a stepped shape corresponding to the part. Further, among the peripheral parts surrounding the central part, fixing screw holes 64 corresponding to the fixing screw holes 45 (fixing screw holes 48) and positioning protrusions 47 (positioning protrusions) are provided at both ends in the longitudinal direction. Positioning through holes 65 corresponding to the portions 50) are provided respectively.

  On the other hand, the vehicle attachment portion 62 is provided with an attachment hole 66 for attaching the ETC vehicle-mounted device 10 to the vehicle. In the present embodiment, two attachment holes 66 are provided in each of the end portions of the case fixing portion 60 and the two vehicle attachment portions 62 connected via the connection portion 61. In this embodiment, the resin member is integrally fixed to both surfaces of the vehicle attachment portion 62 made of a metal material and the wall surface of the attachment hole 66, and the attachment hole is formed in the resin member.

  As shown in FIG. 3, the bracket 13 configured as described above exposes the second stage portion 46 b of the protruding portion 46 from the opening 63 of the case fixing portion 60, and the positioning projection 47 has a corresponding penetration. In a state of being inserted into the hole 65, the screw 15 is inserted and fastened into the fixing screw hole 64 that overlaps with the fixing screw hole 45, and is fixed to the case 12 (lower case 40).

  Next, the effect of the characteristic part of the above-mentioned ETC onboard equipment 10 is demonstrated. First, in the ETC in-vehicle device 10 according to the present embodiment, a protruding strip portion 46 as a step portion is formed around the fixing screw hole 45 that is a fixing portion of the bracket 13 on the bottom outer surface 41a of the lower case 40 constituting the case 12. Is provided. Therefore, compared to a flat structure in which the bottom portion 41 does not have the protruding strip portion 46, the resistance of the bottom outer surface 41a of the lower case 40 including the fixing screw hole 45 to bending stress due to vibration, in other words, bending rigidity (mechanical force against bending). Strength).

  Even if vehicle vibration acts on the fixing screw hole 45 of the lower case 40 via the bracket 13, the protruding thread portion 46 is located in the vicinity of the fixing screw hole 45. Therefore, the fixing screw hole 45 is used as a power point. The vibration of the ETC on-vehicle device 10 can be suppressed, and consequently the generation of abnormal noise due to the contact between the case 12 and the bracket 13 can be suppressed.

  Further, the vibration of the ETC on-vehicle device 10 can be suppressed by the above effect without increasing the fixing screw holes 45 and 64 that are fixing portions (fixing points) between the case 12 and the bracket 13. It is possible to suppress an increase in work man-hours for fixing the bracket 13 to the (lower case 40), thereby reducing the manufacturing cost.

  Further, in the present embodiment, a two-stage ridge 46 is employed. As described above, when the multi-stage ridge 46 (step) is employed, the bending rigidity can be further improved as compared with the single-stage structure. The multi-stage structure is not limited to two stages, and may be three or more stages.

  Further, in the present embodiment, the direction formed by connecting the two fixing screw holes 45 is substantially coincident with the longitudinal direction, and the ridge 46 includes a part of the opposing region of the two fixing screw holes 45. However, the structure is long in the longitudinal direction. As described above, when the protrusion 46 has a structure that is long in the direction in which the two fixing screw holes 45 are connected, the resistance to bending stress due to vibration in the direction in which the protrusions 46 are connected (longitudinal direction in the present embodiment), that is, The bending rigidity in the direction of tying can be improved. And thereby, the vibration of the ETC onboard equipment 10 which made the fixing screw hole 45 a power point can be suppressed effectively.

  In particular, in the present embodiment, the protrusion 46 is a linear structure along the longitudinal direction as a structure that is long in the longitudinal direction, and the planar shape of the protrusion 46 along the outer surface 41a, more specifically, the first step portion 46a. The outer shape and the outer shape of the second stage portion 46b are rectangular. Then, the two fixing screw holes 45 are formed in the vicinity of both ends of the ridge portion 46, specifically, two diagonal lines (a first step portion 46a of the planar rectangular ridge portion 46) (see FIG. It is located within a range (within the range indicated by a broken line arrow) that is sandwiched between broken lines) and adjacent to the longitudinal end of the ridge 46. For this reason, the convex streak 46 improves the bending rigidity in the longitudinal direction and also improves the bending rigidity in the lateral direction. Therefore, even if a bending stress due to vibration in the short direction acts, the deformation of the case 12 (lower case 40) such as torsion is suppressed by the effect of the ridge 46, and consequently the contact between the case 12 and the bracket 13 It is possible to suppress the generation of abnormal noise.

  The effect described above is the same even when the bracket 13 is fixed to the fixing screw hole 48 and the protruding strip portion 49 side.

  In the present embodiment, the case 12 includes the upper case 30 and the lower case 40, and in the short direction, the fitting protrusion 55a (fitting protrusion 55b) and the fitting protrusion 56a (fitting) in the lower case 40 are provided. The fixing screw hole 45, the convex strip 46, and the positioning projection 47 are located between the projection 56b). Further, the fixing screw hole 45, the convex strip portion 46, and the positioning projection 47 are positioned between the fitting protrusion 55 a (fitting protrusion 55 b) and the screw hole 44. That is, in the short direction, the fixing screw hole 45, the protruding strip portion 46, and the positioning protrusion 47 are a plurality of fixing protrusions 55a (fitting protrusions 55b) and fitting protrusions. It is located between any two fixed portions of 56a (fitting protrusion 56b) and screw hole 44 (screw hole 44). Thereby, the rigidity between the fixing | fixed parts in the lower case 40 by which the bracket 13 is fixed can be improved. Therefore, the deformation of the lower case 40 between the fixed portions due to the vehicle vibration and the fluttering of the case 12 due to the variation in the fixed state at each fixed portion due to the vehicle vibration are suppressed, and as a result, the difference due to the contact between the case 12 and the bracket 13 is suppressed. Generation of sound can be suppressed.

  In the present embodiment, due to restrictions such as the wiring pattern on the circuit board 11 and the mounting position of the electronic component, the fitting protrusion 55a provided on one of the sidewall portions 42b and the fitting projection 55a are fitted to each other. The length along the short direction between the fitting protrusion 55b provided on the other side wall 42b and the fitting protrusion 56b is longer than the length along the short direction between the protrusions 56a. . Further, reinforcing ribs 57 are juxtaposed to the side wall portion 42b positioned between the fitting projection 55b and the fitting projection 56b on the longer side. By reinforcing the ribs 57, it is possible to effectively suppress deformation of the lower case 40 between the fixed portions due to vehicle vibration.

  Further, in the present embodiment, the ribs 57 are disposed so as to straddle the end portion 61a far from the vehicle mounting portion 62 in the bracket 13 in the short direction in a state where the bracket 13 is fixed to the lower case 40 (case 12). Is provided. Therefore, even if the bracket 13 tries to vibrate with the vibration fixed to the lower case 40 as a force point due to the vehicle vibration, the lower case 40 and the bracket 13 vibrate due to the effect of improving the rigidity by the ribs 57. Thereby, generation | occurrence | production of the noise by contact with the case 12 and the bracket 13 can be suppressed more effectively.

  Further, in the present embodiment, a rib 52 is provided on the bottom inner surface 41b of the lower case 40 so as to extend along the inner surface 41b and connect the opposing long sides of the planar rectangular ridge 46. 51 is partitioned into a plurality of regions. By providing the ribs 52 that connect the opposing long sides in this way, the bending rigidity in the short direction of the planar rectangular ridges 46 can be improved. In particular, in the present embodiment, the rib 52 has a shape extending along the short direction of the planar rectangular ridge 46, so that the bending rigidity in the short direction can be further improved. In addition, since the plurality of ribs 52 are arranged symmetrically with respect to the center line in the longitudinal direction of the ridge 46 (gap 51), the vibration force received by the fixed part via the bracket 13 due to vehicle vibrations. The ribs 52 can be evenly dispersed. Thereby, it is possible to suppress the generation of a specific vibration mode, for example, abnormal resonance (vibration anisotropy). The effects described above are the same for the rib 54.

  In the present embodiment, an example of the ridge portion 46 is shown as the stepped portion, but the same effect as described above can be expected even when the concave stepped portion is adopted.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the present embodiment, an example of the protruding ridge portion 46 (the protruding ridge portion 49) is shown as the stepped portion, but even if a concave stepped portion is adopted, the same as the protruding stepped portion represented by the protruding ridge portion 46. Can be expected.

  In this embodiment, the example which fixes the bracket 13 to the lower case 40 which comprises the case 12 was shown. However, the bracket 13 may be fixed to the upper case 30 side.

  In this embodiment, the example which makes the fixing | fixed part (fixing point) of the bracket 13 with respect to the case 12 (lower case 40) two places was shown. However, the number of fixing parts is not limited to the above example. For example, it may be only one place or three or more places.

  Moreover, the example of the fastening by the screw | thread 15 was shown as a fixing method of the bracket 13 to case 12 (lower case 40). Employing screw fastening can improve workability when the ETC in-vehicle device 10 is attached to or mounted on the vehicle. However, the fixing method is not limited to screw fastening, and any other method that fixes a part of the case 12 and the bracket 13 facing each other, such as fitting, press-fitting, and welding, can be employed.

  In this embodiment, although the example containing the bracket 13 was shown as the ETC onboard equipment 10, the structure which does not include the bracket 13 is good.

  In the present embodiment, an example of the ETC vehicle-mounted device 10 is shown as the vehicle-mounted device, but the vehicle-mounted device is not limited to the above example.

10 ... ETC on-board equipment (on-vehicle equipment)
DESCRIPTION OF SYMBOLS 11 ... Circuit board 12 ... Case 13 ... Bracket 40 ... Lower case 41a ... (Bottom part) Outer surface 45 ... Fixing screw hole (fixing part)
46 ... ridge (step)
51 ... Gap 52 ... Rib (second rib)

Claims (13)

A circuit board;
A case in which the circuit board is housed inside, and a bracket to be attached to the vehicle is fixed on the outer surface;
The in-vehicle device, wherein the case has a convex or concave stepped portion around the fixed part in a plane including the fixed part of the bracket.   The in-vehicle device according to claim 1, wherein the bracket is fixed to the case.   The in-vehicle device according to claim 1, wherein the stepped portion has a multistage structure in the thickness direction of the case. The case has two fixing parts only in one plane,
The step portion is provided so as to include a part of an opposing region of the two fixing parts, and has a structure that is long in a direction connecting the two fixing parts. 3. The in-vehicle device according to any one of 3 items. The stepped portion has a linear structure along a direction formed by connecting the two fixing parts, and a planar shape along a surface including the fixing parts is a rectangle,
5. The vehicle-mounted device according to claim 4, wherein the fixing portion is located within a range sandwiched between two diagonal lines of the stepped portion having a planar rectangular shape and adjacent to a longitudinal end portion of the stepped portion. machine. The case is composed of two case members that can be divided in the thickness direction of the circuit board,
The case member is provided with a plurality of fixing portions for fixing the two case members to edge portions facing each other among the edge portions surrounding the circuit board,
One of the surfaces perpendicular to the thickness direction of the circuit board in the two case members in the direction in which the plurality of fixing portions at one edge portion are connected to each other is selected from any two of the plurality of fixing portions. The in-vehicle device according to claim 1, wherein the fixing portion and the stepped portion are provided between the two fixing portions. Of the edges facing each other, the two fixing parts adjacent to each other at the one edge, and the two fixing parts corresponding to the two fixing parts and adjacent at the other edge are In the direction of connecting the fixed parts, the distance between the two fixed parts is different,
The in-vehicle device according to claim 6, wherein a first reinforcing rib is provided in parallel with the edge portion between the two fixed portions on the longer distance side.   The first rib is provided so as to straddle at least one end of the bracket with the bracket being fixed to the case in a direction in which the fixing portion is connected. The in-vehicle device according to claim 7.   The case has a second rib for reinforcement that extends along a surface having the fixing portion and divides a gap of the stepped portion so as to connect the opposing long sides of the stepped portion having a flat rectangular shape. Item 6. The in-vehicle device according to Item 5.   The in-vehicle device according to claim 9, wherein the second rib extends along a short side direction of the stepped portion having a planar rectangular shape. The case is provided with a plurality of the second ribs for one stepped portion,
The in-vehicle device according to claim 9 or 10, wherein the plurality of second ribs are arranged symmetrically with respect to a center line in the longitudinal direction of the stepped portion. The bracket is fixed to the case by screw fastening,
The in-vehicle device according to any one of claims 1 to 11, wherein a screw hole is provided in a fixing portion of the case.   The in-vehicle device according to any one of claims 1 to 12, which is used in an ETC system.

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