JP6161502B2 - Automotive electronic devices - Google Patents

Description

  The present invention relates to an electronic device having a shield case in which a circuit board is accommodated, and more particularly to an in-vehicle electronic device fixed in a vehicle.

  Patent Document 1 discloses an invention related to an in-vehicle electronic device. In this in-vehicle electronic device, a lower case and an upper case are combined to form a metal case, and a printed board on which an electronic circuit is mounted is accommodated in the metal case. Both the lower case and the upper case have a rectangular planar shape, and mounting seats are integrally formed on the three side surfaces.

  In Patent Document 1, it is described that the three mounting seats of the lower case and the three mounting seats of the upper case are fastened together. It is thought that it is fixed inside.

  The high-frequency electronic device described in Patent Document 2 includes a frame that stores high-frequency circuit components, an upper surface cover that covers one opening surface of the frame, and a lower surface cover that covers the other opening surface of the frame. Yes. Each of the top cover and the bottom cover is integrally formed with two mounting portions, and the top cover mounting portion and the bottom cover mounting portion are overlapped and screwed together to the housing. .

Japanese Utility Model Publication No. 61-168683 JP-A-8-32269

  In the devices described in Patent Document 1 and Patent Document 2, the width dimension of the mounting seat and the mounting portion is extremely small with respect to the length dimension of the side surface of the case. The mounting seat and the mounting portion do not have sufficient strength to support the case, and when external vibration is applied, the case is likely to vibrate, and further, the mounting seat and the mounting portion are deformed. Cheap.

  Further, since the mounting seat and the mounting portion integrally extend from the metal plate constituting the case, the distortion generated in the mounting seat and the mounting portion is easily transmitted to the metal plate constituting the case as it is. When strain is transmitted to the case, a gap is easily formed in the case, and the internal electronic circuit may not be sufficiently protected from external noise.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and a fixing bracket formed integrally with a case portion can support a shield case containing a circuit board with sufficient strength in a vehicle body. An object of the present invention is to provide an in-vehicle electronic device having a structure in which a shield case is hardly deformed by an external force acting.

The present invention relates to an in-vehicle electronic device provided with a shield case, a circuit board housed in the shield case, and a fixing bracket for fixing the shield case in a vehicle.
The shield case is configured by combining a first case portion and a second case portion, and the first case portion and the second case portion are fixed by a plurality of screwing portions. And
A base portion of the fixing bracket is integrally continuous from a side portion of the second case portion, and a tip portion of the fixing bracket is in a position extending to the outside of the shield case;
Two screwing portions are provided on the side portion of the second case portion, and the two screwing portions are located inside both edges of the base portion of the fixing bracket. It is characterized by this.

  In the in-vehicle electronic device according to the present invention, the screwing portions that fix the second case portion and the first case portion are located inside both edges of the base portion of the fixing bracket. By this screwing, the rigidity of the base portion of the fixed bracket formed integrally with the second case portion is increased, and the support strength of the shield case can be increased. In addition, even if distortion occurs in the fixing bracket, it is difficult to transmit this distortion to the second case part, and the shield case can be prevented from being deformed, and the first case part and the second case part are prevented from being deformed. It becomes possible to regulate the widening of the gap.

  In the present invention, the shield case has a quadrangular planar shape as viewed from the second case portion side, and the base portion of the fixing bracket is integrally continuous from the side portion which is one side thereof, and the fixing case It is preferable that the distance between the both edge portions of the base portion of the bracket is substantially equal to the length of the one side.

  In the above configuration, the width of the base portion of the fixing bracket can be sufficiently increased, and the strength of the fixing bracket can be increased.

  Furthermore, in the present invention, it is preferable that the distance between the both edge portions of the fixing bracket is gradually reduced from the base portion to the tip portion.

  In the above configuration, when a bending moment acts on the fixed bracket due to the inertia force of the shield case, the bending stress at the continuous portion between the second case portion and the base portion of the fixed bracket can be reduced.

  According to the present invention, at least one of the first case portion and the second case portion is provided with a shielding piece that covers a gap at a joint portion between the first case portion and the second case portion. In addition, it is preferable that the length of the gap is regulated to be less than the wavelength of electromagnetic noise by the shielding piece.

  Providing the shielding piece makes it difficult for electromagnetic noise to enter from the gap between the first case portion and the second case portion.

  In the present invention, the first case portion has a concave shape having a plate surface portion and a side surface portion rising from an edge portion of the plate surface portion, and the second case portion has an opening of the first case portion. It is preferable to have a cover body portion that covers and a reinforcing rib formed integrally with the lid body portion.

  In the on-vehicle electronic device of the present invention, the fixing bracket is particularly effective in a structure in which the fixing bracket is curved in a direction away from the second case portion in the height direction of the shield case.

  In the present invention, it is preferable that a reinforcing rib is formed integrally with the fixed bracket.

  According to the present invention, since the rigidity of the base portion of the fixing bracket that extends integrally from the second case portion can be increased, the strength of the fixing bracket can be increased. Further, since there are two screwing portions at the boundary between the second case portion and the fixed bracket, when the fixed bracket is elastically deformed, the deformation is hardly transmitted to the second case. . Therefore, the overall rigidity of the shield case is increased, and it is easy to prevent the gap between the first case portion and the second case portion from being widened.

The perspective view of the vehicle-mounted electronic device of embodiment of this invention, Plan view of in-vehicle electronic device, Left side view of in-vehicle electronic device, Right side view of in-vehicle electronic device, Sectional drawing which cut | disconnected the vehicle-mounted electronic device by the II-II line | wire shown in FIG.

  The in-vehicle electronic device 1 shown in FIG. 1 and below performs processing of an image signal sent from a camera that captures the outside of the vehicle, and is used by being fixed in, for example, a spare tire installation area in the vehicle. The

  The in-vehicle electronic device 1 is provided with a shield case 2. The shield case 2 is configured by combining a first case portion 10 and a second case portion 20. Both the first case portion 10 and the second case portion 20 are formed of a magnetic metal plate such as a steel plate. As shown in FIG. 5, the circuit board 5 is accommodated in the shield case 2. Electronic components constituting the electronic circuit 4 are mounted on the circuit board 5. A connector 6 is fixed to the end of the circuit board 5.

  The first case portion 10 is formed in a concave shape by bending a metal plate. The first case portion 10 has a plate surface portion 11 facing the Z2 side, a first side surface portion 12 facing the X1 side, a second side surface portion 13 facing the X2 side, and a third side surface portion facing the Y1 side. 14 and the fourth side surface portion 15 facing the Y2 side are integrally formed. The first case portion 10 has a cubic shape with an opening directed to the Z1 side. The planar shape viewed from the Z1 side or the Z2 side is a quadrangle.

  As shown in FIG. 3, a connector window 16 is formed at the center of the first side surface portion 12. The connector window 16 is formed to be released upward (Z1 direction).

  In the second case portion 20, a first fixing bracket 30 is continuously and integrally formed on the X1 side, and a second fixing bracket 40 is continuously and integrally formed on the X2 side. . As shown in FIGS. 1 and 5, the first fixing bracket 30 and the second fixing bracket 40 are arranged in the Z1 direction from the shield case 2 in which the first case portion 10 and the second case portion 20 are combined. It is formed to be bent away. This bent portion is a boundary portion B1 between the second case portion 20 and the first fixing bracket 30, and a boundary portion B2 between the second case portion 20 and the second fixing bracket 40.

  In the second case part 20, the part in contact with the boundary part B <b> 1 is the first side part 21, and the part in contact with the boundary part B <b> 2 is the second side part 22. In the first fixed bracket 30, a portion in contact with the boundary portion B <b> 1 is a base portion 31, and a tip portion 32 is located at a portion away from the shield case 2 in the X1 direction and the Z1 direction. In the second fixed bracket 40, a portion that is in contact with the boundary portion B <b> 2 is a base portion 41, and a tip portion 42 is located in a portion that is separated from the shield case 2 in the X2 direction and the Z1 direction.

  As shown in FIGS. 1 and 2, the first case portion 10 and the second case portion 20 are fixed to each other by four screwing portions 7a, 7b, 7c, and 7d. In each screwing part 7a, 7b, 7c, 7d, the fixed piece bent toward the inside of the case from the edge part on the Z1 side of the side surface parts 12, 13, 14, 15 of the first case part 10 is integrated. These fixing pieces are formed with female screw holes. Mounting holes are formed at four locations of the second case portion 20, and the fixing screws 8 are inserted into the mounting holes and screwed into the female screw holes. At the four screw fixing portions 7a, 7b, 7c, 7d, The first case portion 10 and the second case portion 20 are fixed.

  As shown in FIG. 2, the four screwing portions 7 a, 7 b, 7 c, and 7 d are provided inside the four corners of the shield case 2 having a square planar shape. The two screwing portions 7 a and 7 b are provided on the first side portion 21 of the second case portion 20. The screwing portions 7 a and 7 b are disposed on the inner side in the Y direction with respect to both edge portions 31 a and 31 a of the base portion 31 of the first fixing bracket 30. And the space | interval W1 in the Y direction of both edge parts 31a and 31a is wider than the pitch P1 in the Y direction of the screwing parts 7a and 7b. Further, the width dimension W <b> 1 in the Y direction of the base portion 31 of the first fixed bracket 30 substantially matches the width dimension in the Y direction of the first side portion 21 of the second case portion 20.

  Similarly, the screwing portions 7c and 7d are provided inside both edge portions 41a and 41a of the base portion 41 of the second fixing bracket 40 in the Y direction. Further, the interval W2 between both edge portions 41a and 41a of the base portion 41 is wider than the pitch P1 in the Y direction of the screwing portions 7c and 7d. Further, the interval W <b> 2 of the base portion 41 substantially matches the width dimension in the Y direction of the second side portion 22 of the second case portion 20.

  The first fixing bracket 30 is integrally formed continuously with the second case portion 20 at the boundary portion B1. However, the base 31 is formed so as to be substantially coincident with the width dimension of the second case portion 20, and the first side portion 21 of the second case portion 20 is screwed inside the both edges 31a and 31a. It is being fixed to the 1st case part 10 with the parts 7a and 7b. Therefore, even if the first fixing bracket 30 is distorted, the distortion is not directly transmitted to the second case portion 20. Therefore, the shield case 2 is not easily deformed by the distortion of the second case portion 20. Moreover, it can suppress that the joint part of the 1st case part 10 and the 2nd case part 20 is spread, and it becomes easy to control that electromagnetic noise enters the inside of the shield case 2 from a joint part.

  The same applies to the second fixing bracket 40. Even in the continuous portion of the second fixing bracket 40 and the second case portion 20, the second case bracket 20 is fixed by the screwing portions 7c and 7d, so that the strength of the second fixing bracket 40 is high. Thus, the distortion of the second fixed bracket 40 is not easily transmitted to the second case portion 20.

  The first fixing bracket 30 is formed with side bent portions 34, 34 on the Y1 side and the Y2 side, and the first fixing bracket 30 has a U-shaped cross section. Reinforcing ribs 35, 35 that are recessed in the Z2 direction are formed at two locations of the first fixed bracket 30. Similarly, side bent portions 44 and 44 and two reinforcing ribs 45 and 45 recessed in the Z2 direction are also formed in the second fixing bracket 40. Since the side bent portions 34 and 44 and the reinforcing ribs 35 and 45 are formed, the bending strength of the first fixing bracket 30 and the second fixing bracket 40 is enhanced.

  As shown in FIGS. 1 and 2, the first fixing bracket 30 gradually decreases in width from W1 to W3 from the base portion 31 to the tip portion 32. Similarly, the width dimension of the second fixed bracket 40 gradually decreases from the base portion 41 to the tip portion 42 from W2 to W4.

  A female screw hole 33 is formed in the tip portion 32 of the first fixing bracket 30, and a female screw hole 43 is formed in the tip portion 42 of the second fixing bracket 40. When the on-vehicle electronic device 1 is attached to a vehicle such as an automobile, the tip portions 32 and 42 are installed on a frame or the like which is a vehicle structure, and a fixing screw 51 inserted through an attachment hole formed in the frame is a female screw. A fixing screw 52 screwed into the hole 33 and inserted into the mounting hole is screwed into the female screw hole 43.

  The in-vehicle electronic device 1 has a mass that supports the shield case 2 in a state where the tip portion 32 of the first fixing bracket 30 and the tip portion 42 of the second fixing bracket 40 are fixed to the frame.

  When acceleration acts on the shield case 2 by inertial force such as vehicle body vibration, the boundary B1 between the first fixing bracket 30 and the second case portion 20 and the second fixing bracket 40 and the second case portion 20 A bending moment acts on the boundary portion B2. However, since the boundary portions B1 and B2 have the maximum width dimensions W1 and W2, the bending stress acting on the boundary portions B1 and B2 is extremely small. Therefore, it can suppress that the distortion resulting from a support structure generate | occur | produces in the 1st side part 21 and the 2nd side part 22 of the 2nd case part 20, and the deformation | transformation of the shield case 2 and the clearance gap accompanying this can be prevented. It becomes possible to prevent expansion.

  In the second case part 20, the space between the boundary part B <b> 1 and the boundary part B <b> 2 is a lid part 23, and the opening part in the Z <b> 1 direction of the first case part 10 is blocked by the lid part 23. ing. The lid portion 23 is integrally formed with a frame-shaped reinforcing rib 24a formed so as to surround the periphery and a reinforcing rib 24b that crosses the inside thereof. The reinforcing ribs 24a and 24b are formed by partially pressing a metal plate constituting the lid portion 23 into a protruding shape in the Z1 direction. The lid body portion 23 is reinforced with bending strength by providing reinforcing ribs 24a and 24b.

  As shown in FIGS. 1 and 3, the second case portion 20 includes a first shielding piece 25a bent in the Z2 direction from an edge on the Y1 side of the lid portion 23, and an edge on the Y2 side. A second shielding piece 25b bent in the Z2 direction is formed. The gap between the third side surface portion 14 of the first case portion 10 and the lid portion 23 of the second case portion 20 is closed by the first shielding piece 25a. Similarly, the gap between the fourth side surface portion 15 and the lid portion 23 is closed by the second shielding piece 25b.

  As shown in FIG. 3, the first fixing bracket 30 is formed with a notch 36a, and the third shielding piece 36 cut out from the notch 36a is bent in the Z2 direction. The upper portion of the connector window 16 formed on the first side surface portion 12 of the first case portion 10 is closed by the third shielding piece 36.

  As shown in FIG. 3, a gap δ1 is formed between the third shielding piece 36 and the connector 6, and a gap δ2 is formed between the plate surface portion 11 of the first case portion 10 and the connector 6. . A gap δ3 is formed between the first side surface portion 12 and the Y6 side of the connector 6 and the Y2 side.

  These gaps δ1, δ2, and δ3 are set to about 0.3 to 1.5 mm. Since the connector 6 is disposed with the gaps δ1, δ2, and δ3 in both the first case portion 10 and the second case portion 20, the connector 6 is inserted in the Z direction as well as the Y direction. Even if it moves in the direction, it can be avoided that the connector 6 strikes the first case portion 10 and the second case portion 20 strongly, and damage to the connector 6 can be reduced.

  As shown in FIG. 4, notches 46a and 47a are formed in the second fixed bracket 40, and the two fourth shielding pieces 46 and 47 cut and raised by the notches 46a and 47a are Z2. It is bent toward the direction.

  A gap 53 is formed between the second side surface portion 13 of the first case portion 10 and the second case portion 20, and a part of the gap 53 is blocked by the fourth shielding pieces 46 and 47. The gap 53 is limited by the lengths La, Lb, and Lc. By setting the lengths La, Lb, and Lc to be shorter than the expected wavelength of the electromagnetic noise, the electronic circuit 4 can be prevented from being affected by the electromagnetic noise. Among the expected electromagnetic noise, an electromagnetic wave with a short wavelength is a 2 GHz electromagnetic wave used in a mobile phone and has a wavelength of 150 mm. Therefore, the lengths La, Lb, and Lc need to be less than 150 mm.

  In the embodiment described above, the two fixing brackets 30 and 40 are integrally formed on the second case portion 20, but only one of the fixing brackets may be formed.

DESCRIPTION OF SYMBOLS 1 In-vehicle electronic device 2 Shield case 5 Circuit board 6 Connector 7a, 7b, 7c, 7d Screwing part 10 1st case part 12, 13, 14, 15 Side face 16 Connector window 20 2nd case part 21 1st Side 22 Second side 23 Lid 30 Fixed bracket 31 Base 32 Tip 40 Second Fix bracket 41 Base 42 Tip 46, 47 Shielding piece B1, B2 Boundary part

Claims (7)

In an in-vehicle electronic device provided with a shield case, a circuit board housed in the shield case, and a fixing bracket for fixing the shield case in a vehicle,
The shield case is configured by combining a first case portion and a second case portion, and the first case portion and the second case portion are fixed by a plurality of screwing portions. And
A base portion of the fixing bracket is integrally continuous from a side portion of the second case portion, and a tip portion of the fixing bracket is in a position extending to the outside of the shield case;
Two screwing portions are provided on the side portion of the second case portion, and the two screwing portions are located inside both edges of the base portion of the fixing bracket. An in-vehicle electronic device characterized by the above.   The shield case has a square shape when viewed from the side of the second case part, and the base part of the fixing bracket is integrally continuous from the side part which is one side thereof, and the base part of the fixing bracket The in-vehicle electronic device according to claim 1, wherein a distance between the two edge portions is substantially equal to a length of the one side.   The in-vehicle electronic device according to claim 1, wherein a distance between the both edge portions of the fixing bracket is gradually decreased from the base portion to the tip portion.   At least one of the first case portion and the second case portion is provided with a shielding piece that covers a gap between the joint portions of the first case portion and the second case portion. The in-vehicle electronic device according to any one of claims 1 to 3, wherein the length of the gap is regulated by a piece to be less than the wavelength of electromagnetic noise.   The first case portion has a concave shape having a plate surface portion and a side surface portion rising from an edge portion of the plate surface portion, and the second case portion is a lid portion that covers the opening of the first case portion. The vehicle-mounted electronic device according to claim 1, wherein a reinforcing rib is integrally formed on the lid portion.   The in-vehicle electronic device according to any one of claims 1 to 5, wherein the fixing bracket is curved in a direction away from the second case portion toward a height direction of the shield case.   The in-vehicle electronic device according to claim 6, wherein a reinforcing rib is formed integrally with the fixed bracket.

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