JP2021093446A - Electronic device - Google Patents

Abstract

To provide an electronic device capable of appropriately fixing a cover to a case by absorbing dimensional variations of the case.SOLUTION: An electronic device includes: a substrate having a mounting surface of a connector and on which the connector is mounted on the mounting surface while a connection unit of the connector being directed in a direction along the mounting surface; a resin case having a first opening unit for inserting the substrate therein and accommodating the substrate inserted in a direction along the mounting surface from the first opening unit; and a cover fixed to the case so as to block the first opening unit. The cover includes: a second opening unit for exposing the connection unit of the connector on the substrate accommodated in the case in a state of being fixed to the case; a cover side lock unit that is engaged with a case side lock unit provided in the case and holds a state fixed to the case; and an outer claw unit that is formed so as to be closely opposed to an outer surface of the case.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electronic device.

For electronic devices mounted on vehicles such as automobiles, electronic devices equipped with a resin case for accommodating a circuit board, a cover for covering the opening of the case, and a lock portion for fixing the case and the cover to each other are adopted. (See, for example, Patent Document 1). In such an electronic device, the cover is made of a case by a lock portion composed of a convex case-side lock portion provided on the outer surface of the case and a substantially U-shaped flat plate-shaped cover-side lock portion provided on the cover. The state fixed to is maintained.

Japanese Unexamined Patent Publication No. 2014-68518

In the case made of resin as described above, in the resin molding at the time of manufacturing, the opening of the case is in a state of bulging in a bow shape due to thermal expansion of the resin, and the height and width of the opening are non-uniform. There was a case of variation. When such dimensional variation occurs, there is a risk that the cover cannot be properly fixed to the case.

Therefore, an object of the present invention is to provide an electronic device capable of absorbing the dimensional variation of the case and appropriately fixing the cover to the case.

The electronic device according to the present invention has a mounting surface of a connector, and has a substrate on which the connector is mounted on the mounting surface with the connection portion of the connector facing in a direction along the mounting surface, and the substrate inside. A resin case having a first opening for insertion and accommodating the substrate inserted from the first opening in a direction along the mounting surface, and the case so as to close the first opening. A cover fixed to the case is provided, and the cover is fixed to the case and has a second opening for exposing the connection portion of the connector on the substrate housed in the case and the case. It has a cover-side lock portion that engages with the provided case-side lock portion and holds a state of being fixed to the case, and an outer claw portion that is formed so as to be in close contact with the outer surface of the case.

According to the electronic device according to the present invention, even when the opening for inserting the substrate in the resin case is in a state of bulging like a bow and the height and width of the opening are uneven, there is a dimensional variation. The outer claws that are in close proximity to the outer surface of the case can press the case from the outside to the inside of the opening, which can absorb dimensional variations of the case so as to correct the bulge of the opening. it can. Therefore, even when the size of the case varies as described above, the cover-side lock portion can be appropriately engaged with the case-side lock portion to appropriately fix the cover to the case.

It is an exploded perspective view which shows the electronic device which concerns on this embodiment. It is a perspective view of the substrate which comprises the said electronic device. It is a top view of the substrate which comprises the said electronic device. It is a bottom view of the substrate which constitutes the said electronic device. It is a perspective view of the case which comprises the said electronic device. It is a front view of the case which comprises the said electronic device. It is sectional drawing at the position of the arrow VII-VII of FIG. It is sectional drawing at the position of arrow VIII-VIII of FIG. It is a front perspective view of the cover which comprises the said electronic device. It is a rear perspective view of the cover which comprises the said electronic device. It is a rear view of the cover which comprises the said electronic device. It is sectional drawing at the position of arrow XII-XII of FIG. It is sectional drawing at the position of arrow XIII-XIII of FIG. It is a top view of the case and the cover which shows the 1st stage of assembling the electronic device. FIG. 6 is a cross-sectional view of a case, a cover, and a substrate at the positions of arrows XV-XV in FIG. It is a top view of the case and the cover which shows the 2nd stage of assembling the electronic device. 16 is a cross-sectional view of the case, cover and substrate at the positions of arrows XVII-XVII in FIG. 16 is a cross-sectional view of the case, cover and substrate at the positions of arrows XVIII-XVIII in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The terms such as "parallel" and "orthogonal" and the values of length and angle, which specify the shape and geometric conditions and their degrees, which are used in the description of the present embodiment, are bound by a strict meaning. Instead, the interpretation will include the range in which similar functions can be expected. In the drawings referred to in the present embodiment, the same parts or parts having similar functions are designated by the same reference numerals or similar reference numerals, and the repeated description thereof may be omitted. The dimensional ratio of the drawing may differ from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing. In the present embodiment, for convenience of explanation, the directions indicated by the up / down, left / right, and front / back arrows shown in FIG. .. As used herein, the term "proximity facing" includes both a state of being separated from the object in the vicinity of the opposing object and a state of being in contact with the object.

The electronic device 1 according to the present embodiment is an electronic control device for controlling an electric device such as a motor or a suspension damper mounted on a vehicle. As shown in FIG. 1, the electronic device 1 includes a substrate 2 on which an electronic component 21 is mounted, a case 3 for accommodating the substrate 2 inside, and a cover 4 fixed to the case 3.

[Board 2]
As shown in FIGS. 2 and 3, the substrate 2 is a rectangular plate-shaped printed wiring board having a predetermined width in the front-rear direction and the left-right direction and a predetermined thickness in the vertical direction. The electronic component 21 and the connector 22 are mounted on the mounting surface 2a, which is the upper surface of the substrate 2. The electronic component 21 is a component that is driven by electric power supplied from a power source (for example, a battery) mounted on the vehicle to control an electric device mounted on the vehicle. FIG. 2 and the like show a state in which only one electronic component 21 is mounted on the mounting surface 2a, but in reality, various electronic components are mounted on the mounting surface 2a. Further, various electronic components are also mounted on the lower surface of the substrate 2.

The connector 22 is mounted on the mounting surface 2a with the connection portion of the connector 22 facing in the direction along the mounting surface 2a. The connector 22 has a box-shaped housing 221 that opens rearward and a plurality of connection terminals 222 fixed to the housing 221. The connector 22 is mounted on the mounting surface 2a by inserting and soldering the end sides of the plurality of connection terminals 222 protruding forward from the housing 221 into the through holes 20 (see FIG. 4) that penetrate the substrate 2 vertically. Will be done. A harness (cable) side connector for connecting to a power supply and an electric device mounted on a vehicle is inserted into a connection opening 22a (connection portion) opened behind the connector 22 (housing 221) to be connected. A wiring pattern for electrically connecting the electronic components 21 and the connector 22 and the like is formed on the mounting surface 2a of the substrate 2. A resist layer for protecting a wiring pattern or the like is provided on the mounting surface 2a.

Deformation portions 23 and 24 that can be elastically deformed in the vertical direction are formed at the four corner portions of the substrate 2, respectively. Specifically, two front deformation portions 23 are formed on the front end portion 2b side of the substrate 2. One front deformation portion 23 is formed on each of the left and right sides of the front end portion 2b of the substrate 2. In the substrate 2, the front deformed portion 23 is formed on the front end portion 2b side of the substrate 2 by making an L-shaped notch C1 in a plan view extending rearward from the front end portion 2b and further extending in the left-right direction from the rear end portion. .. The front deformed portion 23 formed in this way has a deformed base portion 23a that is connected to the substrate 2 and extends forward, and a deformed arm portion 23b that extends in the left-right direction (center side of the substrate 2) from the front portion of the deformed base portion 23a. doing. The front deformed portion 23 is also formed in a plan view L shape by the deformed base portion 23a and the deformed arm portion 23b, and the front deformed portion 23 is in a cantilevered state with respect to the substrate 2. The substrate 2 is formed in a thin plate shape by a resin material or the like. Therefore, when a force is applied to the tip (free end) side of the deformed arm portion 23b from the vertical direction, the front deformed portion 23 has a connecting portion between the substrate 2 and the deformed base portion 23a, and the deformed base portion 23a and the deformed arm portion 23b. With at least one of the connecting portions as a fulcrum, the deformable arm portion 23b can be elastically deformed so as to move in the vertical direction.

Two rear deformation portions 24 are formed on the rear end portion 2c side of the substrate 2. One rear deformation portion 24 is formed on each of the left and right sides of the rear end portion 2c of the substrate 2. In the substrate 2, the rear deformed portion 24 is formed on the rear end portion 2c side of the substrate 2 by making an L-shaped notch C2 in a plan view extending forward from the rear end portion 2c and further extending in the left-right direction from the front end portion. Has been done. The rear deformation portion 24 formed in this way has a deformation base portion 24a that is connected to the substrate 2 and extends rearward, and a deformation arm portion 24b that extends from the deformation base portion 24a in the left-right direction (center side of the substrate 2). There is. The rear deformed portion 24 is also formed in a plan view L shape by the deformed base portion 24a and the deformed arm portion 24b, and the rear deformed portion 24 is in a cantilevered state with respect to the substrate 2. Since the substrate 2 is made of resin or the like as a thin plate as described above, when a force is applied to the tip (free end) side of the deformed arm portion 24b from the vertical direction, the rear deformed portion 24 has the substrate 2 and the deformed base portion 24a. With at least one of the connecting portion with the deforming base portion 24a and the connecting portion between the deforming base portion 24a and the deforming arm portion 24b as a fulcrum, the tip side of the deforming arm portion 24b can be elastically deformed so as to move in the vertical direction. Although the resist layer is provided on the mounting surface 2a as described above, the front and rear deformed portions 23 and 24 are formed in order to facilitate elastic deformation of the front and rear deformed portions 23 and 24. The resist layer may not be provided on the mounting surface 2a. Further, the same deformed portions as the front and rear deformed portions 23 and 24 may be formed on the left and right end portions of the substrate 2.

As shown in FIG. 4, a substrate-side recess 25 is provided in the center of the rear end portion 2c of the substrate 2. The substrate-side recess 25 has a notch shape that penetrates the rear end portion 2c of the substrate 2 in the vertical direction and opens rearward.

[Case 3]
As shown in FIGS. 5 and 6, the case 3 is a resin rectangular box-shaped member composed of a front wall portion 3a, a lower wall portion 3b, an upper wall portion 3c, a left wall portion 3d, and a right wall portion 3e. The case 3 has a case-side opening 31 that opens rearward. The case 3 can accommodate the substrate 2 inserted through the case-side opening 31 inside the case 3. The substrate 2 is inserted into and accommodated inside the case 3 from the front end portion 2b side through the case side opening 31 in the direction along the mounting surface 2a.

The case 3 has two convex case-side lock portions 36 provided on the left and right sides near the case-side opening 31 on the outer surface of the upper wall portion 3c, and the left and right sides of each case-side lock portion 36 and the case 3. It has two U-shaped lock wall portions 37 provided so as to surround the front side. The two case-side lock portions 36 and the two lock wall portions 37 are similarly provided on the lower wall portion 3b of the case 3. The case-side lock portion 36 has an inclined surface 36a that inclines upward toward the front, and a front side surface 36b that connects to the front end portion (upper end portion) of the inclined surface 36a and extends downward. The front side surface 36b is orthogonal to the outer surface of the upper wall portion 3c, and the surface normal direction is parallel to the front-rear direction.

The case 3 has a connector receiving portion 38 having a shape that bulges upward in the center of the left and right at a position close to the opening on the case side 31 in the upper wall portion 3c, and two claw receiving portions provided on both the left and right sides of the connector receiving portion 38, respectively. It further has a portion 39. Each of the two claw receiving portions 39 has a notch shape that penetrates the upper wall portion 3c in the vertical direction and opens rearward. Each claw receiving portion 39 has a stepped shape in which the inner circumference on the lower side is smaller than that on the upper side (that is, the lower side is constricted), and has a stepped portion 39a protruding rearward and inwardly to the left and right.

The upper wall portion 3c of the case 3 has a stepped shape in which the portion on the rear side from the center of the front and rear is higher than the portion on the front side. When the substrate 2 is housed inside the case 3, the upper wall portion 3c is configured such that the rear portion of the upper wall portion 3c is separated from the mounting surface 2a of the substrate 2 above the front portion. Since the upper wall portion 3c has such a stepped shape, it is possible to mount a relatively tall electronic component on the rear side of the mounting surface 2a on the substrate 2. Further, since the upper wall portion 3c has the stepped shape, it is possible to reduce the vertical dimension (thinness) on the front side of the case 3.

The case 3 further has two sets of case-side substrate holding portions 32 provided on the inner surface of the front wall portion 3a facing the case-side opening portion 31 inside the case 3. A set of case-side substrate holding portions 32 is provided on each of the left and right sides on the inner surface of the front wall portion 3a. A set of case-side substrate holding portions 32 is located between two case-side first holding portions 321 and two case-side first holding portions 321 arranged at predetermined intervals in the left-right direction on the front wall portion 3a. It has one case-side second holding portion 322 arranged in.

As shown in FIGS. 6 to 8, each of the two case-side first holding portions 321 has a flat plate shape extending from the inner surface of the front wall portion 3a to the case-side opening 31 side (rear), and has a thickness in the left-right direction. It is a flat plate provided in the direction of the direction. Of the two case-side first holding portions 321, the case-side first holding portion 321 arranged on the left and right center sides of the case 3 is the case-side first holding portion arranged on the left and right wall portions 3d and 3e. The dimension extending toward the case side opening 31 side (rear side) is longer than that of 321 (see FIG. 8). An inclined surface 321a that inclines downward toward the rear is formed on the rear end side of each of the two case-side first holding portions 321 (see FIG. 7).

The case-side second holding portion 322 is arranged on the inner surface of the front wall portion 3a between the two case-side first holding portions 321 and above the two case-side first holding portions 321. Similar to the case-side first holding portion 321, the case-side second holding portion 322 has a flat plate shape extending from the inner surface of the front wall portion 3a to the case-side opening 31 side (rear), and the left-right direction is the thickness direction. It is in the shape of a flat plate provided in the correct direction. The dimension of the case-side second holding portion 322 extending toward the case-side opening 31 side is shorter than the case-side first holding portion 321 arranged on the left and right center sides of the case 3, and is closer to the left and right wall portions 3d and 3e. It is longer than the arranged case-side first holding portion 321 (see FIG. 8). An inclined surface 322a that inclines upward toward the rear is formed on the rear end side of the second holding portion 322 on the case side (see FIG. 7). The two case-side first holding portions 321 and the case-side second holding portion 322 are arranged in the vertical direction at intervals smaller than the thickness of the substrate 2. In other words, the vertical distance between the upper end portion of the two case-side first holding portions 321 and the lower end portion of the case-side second holding portion 322 is smaller than the thickness of the substrate 2.

One set of case-side substrate holding portions 32 is a case-side third holding portion arranged above the case-side first holding portions 321 arranged on the left and right wall portions 3d and 3e on the inner surface of the front wall portion 3a. It also has 323. Similar to the holding portions 321 and 322, the case-side third holding portion 323 has a flat plate shape extending from the inner surface of the front wall portion 3a to the case-side opening 31 side (rear), and the left-right direction is the thickness direction. It is a flat plate provided in the direction. The dimension of the case-side third holding portion 323 extending toward the case-side opening 31 side is shorter than that of the case-side first holding portion 321 arranged on the left and right wall portions 3d and 3e (see FIG. 8). The case-side first holding portion 321 and the case-side third holding portion 323 arranged on the left and right wall portions 3d and 3e are at the same distance as the thickness of the substrate 2 in the vertical direction (or slightly smaller than the thickness of the substrate 2). They are arranged with a large interval). In other words, the substrate 2 can be inserted between the upper end of the case-side first holding portion 321 and the lower end of the case-side third holding portion 323, and the substrate 2 is the case-side first holding portion 321. And it is sandwiched by the third holding portion 323 on the case side.

A set of case-side substrate holding portions 32 is convex arranged between the upper end portions of the two case-side first holding portions 321 and the lower end portions of the case-side second holding portions 322 on the inner surface of the front wall portion 3a. It further has a substrate front end positioning projection 324 in the shape of a substrate. The substrate front end positioning protrusion 324 is arranged between the two case-side first holding portions 321 and on the left and right wall portions 3d and 3e side of the case-side second holding portion 322. When the substrate 2 is inserted into the case 3, the substrate front end positioning protrusion 324 comes into contact with the tip end side of the deformed arm portion 23b of the front deformed portion 23 of the substrate 2, and the deformed arm portion 23b is inserted in the direction opposite to the insertion direction ( It is designed to press backward). The substrate front end positioning protrusion 324 may be changed to another position in terms of arrangement in the left-right direction.

The case 3 has two substrate insertion guide portions 35 provided on both left and right sides of the inner surface of the lower wall portion 3b inside the case 3. Each of the two substrate insertion guide portions 35 extends from a position close to the case-side opening 31 to the inner surface side of the front wall portion 3a on the inner surface of the lower wall portion 3b. The height of the board insertion guide portion 35 (height from the inner surface of the lower wall portion 3b) is slightly lower than the height position of the upper end portion of the first holding portion 321 on the two case sides (or the two case sides). The position is substantially the same as the height position of the upper end portion of the first holding portion 321 (see FIGS. 6 and 7). When the substrate 2 is inserted from the case-side opening 31, the two substrate insertion guide portions 35 abut on both ends in the left-right direction on the opposite surface 2d of the mounting surface 2a, so that the substrate 2 can be inserted into the case 3. It is designed to guide the insertion.

[Cover 4]
As shown in FIGS. 9 to 11, the cover 4 is a flat plate-like member having a predetermined thickness in the front-rear direction and extending in the left-right direction. The cover 4 has a flat plate shape having a size capable of closing the case-side opening 31 of the case 3, and the case-side opening 31 is in contact with the rear end of the case 3 forming the case-side opening 31. It is fixed to the case 3 so as to close the case. The cover 4 has a cover-side opening 45 provided at the center of the left and right, and three outer sides provided at the left and right sides of the cover-side opening 45 at the upper end of the cover 4 and at the center of the left and right at the lower end of the cover 4, respectively. It has claws 471, 472, 473. Hereinafter, the outer claw portion 471 provided on the left side of the cover side opening 45 at the upper end portion of the cover 4 is referred to as a first outer claw portion 471, and is provided on the right side of the cover side opening 45 at the upper end portion of the cover 4. The outer claw portion 472 provided may be referred to as a second outer claw portion 472, and the outer claw portion 473 provided at the center of the lower end portion of the cover 4 may be referred to as a third outer claw portion 473. The cover-side opening 45 is provided at a position biased upward rather than at the center of the top and bottom of the cover 4, and is open upward. The cover-side opening 45 exposes the connection opening 22a of the connector 22 in the substrate 2 housed in the case 3 in a state of being fixed to the case 3.

The first and second outer claw portions 471 and 472 are connected to the neck portion 47a extending upward from the upper end portion of the cover 4 and the upper end of the neck portion 47a, respectively, and are formed larger in the left-right direction and anteriorly than the neck portion 47a. It has a head 47b. The first and second outer claw portions 471 and 472 have a substantially T-shape when viewed from the front-rear direction. When the cover 4 is fixed to the case 3, the neck portion 47a is inserted into the claw receiving portion 39, and the lower surface of the portion extending forward of the head 47b is in close contact with the upper surface of the stepped portion 39a of the claw receiving portion 39. ing. The first and second outer claw portions 471 and 472 are close to each other with the stepped portion 39a of each claw receiving portion 39 so as to be close to the outer surface of the upper wall portion 3c of the case 3. The third outer claw portion 473 has a flat plate shape extending forward from the lower end portion of the cover 4, and has a substantially U-shaped outer shape in a plan view (the front end portion is formed in an arc shape). ing). When the cover 4 is fixed to the case 3, the upper surface of the third outer claw portion 473 is in close contact with the outer surface of the lower wall portion 3b of the case 3.

The cover 4 further has two sets of cover-side lock portions 46 provided on the left and right end sides of the three outer claw portions 471 to 473, respectively. The two sets of cover-side lock portions 46 each have two flat plate-shaped lock arm portions 461 extending forward from the upper end portion and the lower end portion of the cover 4, respectively. Each of the two lock arm portions 461 is formed with a lock hole 461a penetrating in the vertical direction. When the cover 4 is fixed to the case 3, the cover-side lock portion 46 engages with the case-side lock portion 36 provided on the case 3 to hold the cover 4 fixed to the case 3. More specifically, the cover-side lock portion 46 is guided so as to ride on the case-side lock portion 36 along the inclined surface 36a of the case-side lock portion 36 when the cover 4 is fixed to the case 3. The case-side lock portion 36 is inserted into the lock hole 461a so as to surround the lock portion 36. Then, the front side surface 36b of the case side lock portion 36 is brought into contact with the front inner side surface of the lock hole 461a to maintain the fixed state.

The cover 4 is covered by a plurality of inner claws 48 provided on both the upper and lower sides of the front surface 4a (inner surface) of the cover 4 facing the inside of the case 3 when fixed to the case 3, and the center of the left and right sides of the front surface 4a. It further has a connector support portion 49 provided at a position close to the side opening 45. Each of the plurality of inner claw portions 48 has a flat plate shape extending forward from the front surface 4a. The plurality of inner claw portions 48 are formed so as to be close to each other on the inner surfaces of the upper and lower wall portions 3c and 3b of the case 3 when the cover 4 is fixed to the case 3. An inclined surface 48a that is inclined downward toward the front is formed on the inner claw portion 48 that is closely opposed to the inner surface of the upper wall portion 3c of the case 3. An inclined surface 48a that is inclined upward toward the front is formed on the inner claw portion 48 that is closely opposed to the inner surface of the lower wall portion 3b of the case 3. Each inner claw portion 48 is adapted to sandwich the upper and lower wall portions 3c and 3b of the case 3 in the vertical direction together with the above-mentioned three outer claw portions 471 to 473. The connector support portion 49 has a flat plate shape extending forward from the front surface 4a. An inclined surface 49a that inclines downward toward the front is formed on the front end side of the connector support portion 49 (see FIG. 10). When the cover 4 is fixed to the case 3, the inclined surface 49a of the connector support portion 49 comes into contact with the lower end outer surface 22b (see FIG. 15) of the connector 22 of the substrate 2 housed inside the case 3, and the connector support portion 49 supports the connector 22. Further, the connector support portion 49 is inserted into the substrate side recess 25 of the substrate 2.

The cover 4 is provided on the front surface 4a on the left and right end sides of the plurality of flat plate-shaped reinforcing portions 43 provided so as to connect the plurality of inner claw portions 48 and the two sets of cover-side substrate holding portions 41, respectively. It further has a flat plate-shaped substrate insertion guide portion 44.

The cover 4 further has two sets of cover-side substrate holding portions 41 provided on the front surface 4a. A set of cover-side substrate holding portions 41 is provided on each of the left and right sides of the front surface 4a of the cover 4. A set of cover-side substrate holding portions 41 is located between two cover-side first holding portions 411 and two cover-side first holding portions 411 arranged at predetermined intervals in the left-right direction on the front surface 4a of the cover 4. It has one cover-side second holding portion 412 arranged in.

As shown in FIGS. 10 to 13, each of the two cover-side first holding portions 411 is a flat plate extending forward from the front surface 4a of the cover 4, and is provided so that the left-right direction is the thickness direction. It has a shape. The two cover-side first holding portions 411 have the same length extending forward from the front surface 4a (see FIG. 13). An inclined surface 411a that inclines downward toward the front is formed on each of the front end sides of the two cover-side first holding portions 411 (see FIG. 12).

The cover-side second holding portion 412 is arranged between the two cover-side first holding portions 411 and above the two cover-side first holding portions 411 on the front surface 4a of the cover 4. Like the cover-side first holding portion 411, the cover-side second holding portion 412 has a flat plate shape extending forward from the front surface 4a and is provided in a direction in which the left-right direction is the thickness direction. .. The dimension extending forward of the cover-side second holding portion 412 is the same length as the dimension extending forward from the front surface 4a of the two cover-side first holding portions 411 (see FIG. 12). An inclined surface 412a that inclines upward toward the front is formed on the front end side of the cover-side second holding portion 412 (see FIG. 12). The two cover-side first holding portions 411 and the cover-side second holding portion 412 are arranged in the vertical direction at intervals smaller than the thickness of the substrate 2. In other words, the vertical distance between the upper end portion of the two cover-side first holding portions 411 and the lower end portion of the cover-side second holding portion 412 is smaller than the thickness of the substrate 2.

A set of cover-side substrate holding portions 41 are located on the front surface 4a of the cover 4 at positions above the cover-side first holding portion 411 arranged on the left and right end sides of the cover 4 and at positions close to the cover-side opening 45, respectively. It further has two arranged cover-side third holdings 413. Similar to the holding portions 411 and 412, each of the two cover-side third holding portions 413 has a flat plate shape extending forward from the front surface 4a and is provided in a direction in which the left-right direction is the thickness direction. ing. The dimension extending forward of the cover-side third holding portion 413 is shorter than that of the cover-side first holding portion 411 (see FIG. 13). The first holding portion 411 on the cover side and the third holding portion 413 on the cover side arranged on the left and right end sides of the cover 4 are spaced apart from each other in the vertical direction at the same distance as the thickness of the substrate 2 (or slightly larger than the thickness of the substrate 2). ) Is vacant. In other words, the substrate 2 can be inserted between the upper end of the cover-side first holding portion 411 and the lower end of the cover-side third holding portion 413, and the substrate 2 is the cover-side first holding portion 411. And it is sandwiched by the third holding portion 413 on the cover side.

A set of cover-side substrate holding portions 41 has a convex shape arranged between the upper end portions of the two cover-side first holding portions 411 and the lower end portions of the cover-side second holding portions 412 on the front surface 4a of the cover 4. Further has a substrate rear end positioning projection 414. The substrate rear end positioning projection 414 is located between the two cover-side first holding portions 411 and is arranged on the left and right end sides of the cover 4 with respect to the cover-side second holding portion 412. When the substrate 2 is inserted into the cover-side substrate holding portion 41, the substrate rear end positioning projection 414 comes into contact with the tip end side of the deformed arm portion 24b of the rear deformed portion 24 on the substrate 2 and inserts the deformed arm portion 24b. It is designed to press in the direction opposite to the direction (forward).

[Assembly of electronic device 1]
Next, the assembly of the electronic device 1 configured as described above will be described. As shown in FIG. 1, the electronic device 1 inserts the substrate 2 into the case 3 through the case-side opening 31, and then fixes the cover 4 to the case 3 so as to close the case-side opening 31. Can be assembled. In the electronic device 1, the substrate 2 and the cover 4 can be assembled, and the substrate 2 can be inserted into the case 3 and the cover 4 can be fixed to the case 3 in the assembled state.

[Insert board 2 into case 3]
The substrate 2 is inserted into the case 3 from the front end portion 2b side through the case side opening 31 in the direction along the mounting surface 2a. The substrate 2 is inserted inside the case 3 while being guided so as to slide on the upper ends of the left and right substrate insertion guides 35. When the substrate 2 is inserted into the case 3, the front end portion 2b of the substrate 2 first becomes the case-side first holding portion 2b arranged on the left and right center sides of the case 3 in the left and right case-side substrate holding portions 32. It abuts on the inclined surface 321a of 321 respectively. After that, the front end portions of the deformation base portions 23a of the left and right front side deformation portions 23 on the substrate 2 are arranged on the left and right wall portions 3d and 3e side of the case 3 in the left and right case side substrate holding portions 32. It comes into contact with the inclined surface 321a of the portion 321 respectively. Then, the substrate 2 is inserted into the case 3 while the front end portions 2b of the substrate 2 and the front end portions of the left and right deformation base portions 23a are pushed up along the inclined surface 321a.

As the substrate 2 is further inserted into the case 3, the front end portion of the deformed arm portion 23b of the left and right front deformed portions 23 on the free end side becomes the case side second holding portion 322 of the left and right case side substrate holding portions 32. It comes into contact with the inclined surface 322a of the above. Then, the free end sides of the left and right deformed arm portions 23b are pushed down along the inclined surface 322a. By being pushed down in this way, the front side so that the free end side of the left and right deformed arm portions 23b moves downward with the contact portion between the lower surface of the deforming base portion 23a and the upper end portion of the first holding portion 321 on the case side as a fulcrum. The deformed portion 23 is elastically deformed. After that, the left and right deformation bases 23a are sandwiched between the upper end of the case-side first holding portion 321 and the lower end of the case-side third holding portion 323. The substrate 2 is inserted into the case 3 until the front ends of the left and right deformed arm portions 23b come into contact with the left and right substrate front end positioning protrusions 324. When the substrate 2 is inserted into the case 3 in this way, the front end portion 2b side of the substrate 2 is supported from below by the upper end portion of the case side first holding portion 321 and the left and right deformation base portions 23a are supported by the case side first holding portion 321. The front end of the substrate 2 is sandwiched by the 321 and the case-side third holding portion 323 from the vertical direction, and the left and right deformed arm portions 23b come into contact with the lower end portion of the case-side second holding portion 322 in a state of being elastically deformed downward. The portion 2b side is held by the case 3.

[Fixing the cover 4 to the case 3]
After the substrate 2 is inserted into the case 3 as described above, the cover 4 is fixed to the case 3 so as to close the case-side opening 31. When the cover 4 is brought closer to the case 3 with the front surface 4a of the cover 4 facing the case-side opening 31, the inclined surface 49a of the connector support portion 49 of the cover 4 becomes as shown in FIGS. 14 and 15. , It comes into contact with the lower end outer surface 22b of the connector 22 mounted on the substrate 2. Then, while the inclined surface 49a of the connector support portion 49 supports the connector 22 so as to push up along the inclined surface 49a, the connection opening 22a of the connector 22 protrudes outward from the cover side opening 45 of the cover 4. The connector 22 is guided so as to do so. At this time, the tip of the lock arm portion 461 of the cover-side lock portion 46 comes into contact with the inclined surface 36a of the case-side lock portion 36. Then, the lock arm portion 461 is elastically deformed by the reaction force due to the contact with the inclined surface 36a, and the front inner side surface of the lock hole 461a gets over the inclined surface 36a and comes into contact with the front side surface 36b of the case side lock portion 36. Proceed forward until you get to. Further, at this time, the upper inner claw portion 48 advances forward while contacting the inner surface of the upper wall portion 3c of the case 3, and the lower inner claw portion 48 contacts the inner surface of the lower wall portion 3b of the case 3. While moving forward. Since the inclined surface 48a is formed at the tip of the inner claw portion 48, the inner claw portion 48 can be smoothly inserted into the case 3. Further, at this time, the inner side surfaces of the left and right substrate insertion guide portions 44 of the cover 4 come into contact with the left and right end portions of the substrate 2, so that the substrate 2 is positioned in the left-right direction. Further, at this time, the inclined surface 411a of the cover-side first holding portion 411 in the left and right cover-side substrate holding portions 41 of the cover 4 is deformed into the rear end portion 2c of the substrate 2 inserted into the case 3 and the left and right rear sides. It comes into contact with the rear end portion of the deformation base portion 24a of the portion 24, respectively. Then, the inclined surfaces 411a of the left and right cover-side first holding portions 411 push up the rear end portions 2c of the substrate 2 and the rear end portions of the left and right deformation base portions 24a along the inclined surfaces 411a, and the front surface 4a of the cover 4 Approaches the rear end 2c side of the substrate 2.

When the front surface 4a of the cover 4 approaches the rear end portion 2c side of the substrate 2, the inclined surfaces 412a of the cover side second holding portion 412 in the left and right cover side substrate holding portions 41 become the left and right rear sides of the substrate 2. The deformed arm portion 24b of the deformed portion 24 comes into contact with the rear end portion on the free end side. Then, the inclined surfaces 412a of the left and right cover-side second holding portions 412 push down the free end sides of the left and right deformed arm portions 24b along the inclined surfaces 412a. By pushing down the free end side of the deformable arm portion 24b in this way, the free ends of the left and right deformed arm portions 24b are set as fulcrums with the contact portion between the lower surface of the deformable base portion 24a and the upper end portion of the first holding portion 411 on the cover side as a fulcrum. The rear side deformation portion 24 is elastically deformed so that the side moves downward. After that, in the left and right cover-side substrate holding portions 41, the upper end portions of the two cover-side first holding portions 411 and the lower end portions of the two cover-side third holding portions 413 are deformed from the rear end portion 2c of the substrate 2. The base portion 24a is sandwiched from above and below. Further, the substrate rear end positioning protrusions 414 of the left and right cover-side substrate holding portions 41 come into contact with the rear end portions of the left and right deformed arm portions 24b of the substrate 2 on the free end side. In such a state, the rear end portion 2c side of the substrate 2 and the left and right deformation base portions 24a are sandwiched by the cover side first holding portion 411 and the cover side third holding portion 413 from the vertical direction, and the left and right deformed arm portions 24b. Is elastically deformed downward and abuts on the lower end of the cover-side second holding portion 412, so that the rear end portion 2c side of the substrate 2 is held by the cover 4.

To fix the cover 4 to the case 3, as shown in FIGS. 16 to 18, the left and right case-side lock portions 36 in the case 3 are inserted into the lock holes 461a of the left and right cover-side lock portions 46 in the cover 4. By engaging, the cover 4 is fixed to the case 3. More specifically, the front side surface 36b of the case side lock portion 36 abuts on the front inner side surface of the lock hole 461a to prevent the cover side lock portion 46 from moving backward, and the upper and lower lock arm portions 461 By sandwiching the case 3 between them, the fixed state of the case 3 is maintained. At this time, in the first outer claw portion 471 and the second outer claw portion 472, the neck portion 47a is inserted into the claw receiving portion 39, and the lower surface of the portion extending forward of the head 47b is the stepped portion 39a of the claw receiving portion 39. Closely opposed to the upper surface of. The first and second outer claw portions 471 and 472 are closely opposed to the outer surface of the upper wall portion 3c of the case 3 by being close to the stepped portion 39a of each claw receiving portion 39. The third outer claw portion 473 is close to the outer surface of the lower wall portion 3b of the case 3.

In the accommodation space formed by fixing the cover 4 to the case 3, the front end portion 2b side of the substrate 2 is supported from below by the case side first holding portion 321 as described above, and the left and right deformation base portions 23a Is sandwiched by the case-side first holding portion 321 and the case-side third holding portion 323 from the vertical direction, and the left and right deformed arm portions 23b come into contact with the lower end portion of the case-side second holding portion 322 in a state of being elastically deformed downward. As a result, the front end portion 2b side of the substrate 2 is held by the case 3. Further, the rear end portion 2c side of the substrate 2 and the left and right deformation base portions 24a are sandwiched from the vertical direction by the cover side first holding portion 411 and the cover side third holding portion 413, and the left and right deformed arm portions 24b are elastically deformed downward. By contacting the lower end portion of the cover side second holding portion 412 in this state, the rear end portion 2c side of the substrate 2 is held by the cover 4. Further, the left and right deformed arm portions 23b of the front deformed portion 23 and the left and right deformed arm portions 24b of the rear deformed portion 24 are pressed from the front-rear direction by the substrate front end positioning projection 324 and the substrate rear end positioning projection 414. , The substrate 2 is held in the accommodation space in a state where the movement in the front-rear direction is restricted. Further, the connector support portion 49 is inserted into the substrate-side recess 25 (see FIG. 4) formed in the rear end portion 2c of the substrate 2, so that the final positioning of the substrate 2 in the left-right direction is performed. In this way, the substrate 2 is held in a fixed state in the accommodation space formed by fixing the cover 4 to the case 3.

According to the electronic device 1 according to the present embodiment configured as described above, the case-side opening 31 in the resin case 3 swells in a bow shape due to thermal expansion of the resin during resin molding of the case 3. Even if the height and width of the case-side opening 31 become non-uniform, the case-side opening 31 will be opened by the three outer claws 471 to 473 that are in close proximity to the outer surface of the case 3. The case 3 can be pressed from the outside to the inside, whereby the dimensional variation of the case 3 can be absorbed so as to correct the bulge of the case side opening 31. Therefore, even if there is a dimensional variation of the case 3 as described above, the cover side lock portion 46 can be appropriately engaged with the case side lock portion 36 to appropriately fix the cover 4 to the case 3. ..

In the electronic device 1 according to the present embodiment, in a state where the cover 4 is fixed to the case 3, the plurality of inner claws 48 are close to the inner surface of the case 3 so as to sandwich the case 3 together with the three outer claws 471 to 473. opposite. As a result, the coupling force between the case 3 and the cover 4 can be increased to improve the rigidity of the electronic device 1.

In the electronic device 1 according to the present embodiment, when the cover 4 is fixed to the case 3, the connector support portion 49 abuts on the lower end outer surface 22b of the connector 22 on the side facing the substrate 2 to support the connector 22. As a result, the connector 22 can be smoothly guided along the connector support portion 49 to the outside of the cover-side opening 45, so that the electronic device 1 can be smoothly assembled.

In the electronic device 1 according to the present embodiment, when the cover 4 is fixed to the case 3, the cover-side first holding portion 411 abuts on the opposite surface 2d of the mounting surface 2a on the substrate 2 to support the substrate 2. As a result, the cover 4 can be fixed to the case 3 while the substrate 2 is supported by the first holding portion 411 on the cover side, so that the electronic device 1 can be stably assembled.

In the electronic device 1 according to the present embodiment, in a state where the cover 4 is fixed to the case 3, the cover-side lock portion 46 surrounds the convex case-side lock portion 36 provided on the outer surface of the case 3, and the case side. The lock portion 36 abuts on the front side surface 36b on the side far from the cover side opening 45 to hold the fixed state. As a result, the fixed state of the cover 4 to the case 3 can be stably maintained. Further, the case 3 has a lock wall portion 37 that surrounds the cover side lock portion 46 in a state where the cover 4 is fixed to the case 3. As a result, even if a liquid such as water adheres to the outer surface of the case 3, the progress of the liquid to the case side opening 31 side can be suppressed by the lock wall portion 37, so that the liquid invades the inside of the case 3. Therefore, it is possible to suppress the influence on the electrical characteristics of the electronic component 21 mounted on the substrate 2 inside the case 3.

In the electronic device 1 according to the present embodiment, when the substrate 2 is inserted through the case-side opening 31, the pair of substrate insertion guide portions 35 abut on the left and right ends on the opposite surfaces of the mounting surface 2a, respectively, and the case. Guide the insertion of the substrate 2 into the 3. As a result, the substrate 2 can be smoothly inserted into the case 3, so that the electronic device 1 can be assembled more smoothly.

In the electronic device 1 according to the present embodiment, the first outer claw portion 471 and the second outer claw portion 472 are provided on the left and right sides of the cover side opening 45 at the upper end portion of the cover 4, and the third outer claw portion 473 is the cover 4. By being provided so as to be located between the first outer claw portion 471 and the second outer claw portion 472 at the lower end portion of the cover side, the three outer claw portions are surrounded by the cover side opening 45 in a triangular shape. 471 to 473 can be in close proximity to the outer surface of the case 3. As a result, the rigidity of the case 3 around the cover-side opening 45 can be improved, so that the mechanical strength of the electronic device 1 when the harness connected to the connector 22 is pulled can be sufficiently ensured. it can.

In the electronic device 1 according to the present embodiment, when the cover 4 is fixed to the case 3, the connector support portion 49 is inserted into the substrate side recess 25 formed in the rear end portion 2c of the substrate 2. As a result, the substrate 2 can be properly positioned in the left-right direction.

Although the embodiment according to the present invention has been described, the above embodiment is an example, and the present invention is not limited to the above embodiment. Various modifications, replacements, omissions, etc. can be made without departing from the gist of the present invention.

1 Electronic device 2 Board 2a Mounting surface 22 Connector 3 Case 31 Case side opening (first opening)
36 Case-side lock 4 Cover 45 Cover-side opening (second opening)
46 Cover side lock 47 Outer claw

Claims (8)

A board having a mounting surface of a connector and having the connector mounted on the mounting surface with the connection portion of the connector facing in a direction along the mounting surface.
A resin case having a first opening for inserting the substrate inside and accommodating the substrate inserted from the first opening in a direction along the mounting surface.
A cover fixed to the case so as to close the first opening is provided.
The cover engages with a second opening that exposes the connection portion of the connector in the substrate housed in the case and a case-side lock portion provided in the case while being fixed to the case. An electronic device having a cover-side lock portion that holds a state of being fixed to the case, and an outer claw portion that is formed so as to face the outer surface of the case in close proximity to the outer surface of the case. The electronic device according to claim 1, wherein the cover has an inner claw portion formed so as to sandwich the case together with the outer claw portion while being fixed to the case. The electronic device according to claim 1 or 2, wherein the cover has a connector support portion that abuts on the outer surface of the connector on the side facing the substrate when fixed to the case to support the connector. The electronic device according to any one of claims 1 to 3, wherein the cover has a substrate support portion that abuts on the opposite surface of the mounting surface of the substrate to support the substrate when fixed to the case. The cover-side lock portion is arranged so as to surround the convex case-side lock portion provided on the outer surface of the case in a state where the cover is fixed to the case, and the case-side lock portion is the first. 1 It is configured to abut on the side surface far from the opening and hold the fixed state.
The electronic device according to any one of claims 1 to 4, wherein the case has a wall portion surrounding the periphery of the cover-side lock portion in a state where the cover is fixed to the case. When the substrate is inserted through the first opening, the case abuts on both ends in the width direction orthogonal to the insertion direction and the plate thickness direction of the substrate on the opposite surface of the mounting surface, and the inside of the case. The electronic device according to any one of claims 1 to 5, which has a pair of substrate insertion guide portions for guiding the insertion of the substrate into the substrate. The outer claws include a first outer claw and a second outer claw provided on one end side of the cover with respect to the second opening, and the first outer claw on the other end side of the cover. The electronic device according to any one of claims 1 to 6, further comprising a third outer claw portion provided so as to be located between the portion and the second outer claw portion. The electronic device according to any one of claims 1 to 7, wherein the cover has a cover-side convex portion that is inserted into a substrate-side concave portion formed at an end portion of the substrate when fixed to the case.

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