JP2012119621A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device which allows for attachment enhancement of a cover to a case without providing an excessive clearance between a connection member and an insertion opening for inserting the connection member.SOLUTION: An urging part 32 for supporting the upper plate surface 40a of a circuit board 40 contained in a case 20 while urging when a guide part 33 is attached by a clamping part 22 or after completing guidance is formed on a cover 30. The guide part 33 is formed so that the proximal end portion 33a thereof is guided by the clamping part 22 when guidance is completed, and the distal end portion 33b thereof is guided by the clamping part 22 when guidance is started. The proximal end portion 33a is formed so that an insertion opening 31a is positioned to eliminate the clearance between the insertion opening 31a and a connector 42 when guidance is completed, and a protrusion 33d protruding farther than the proximal end portion 33a in the urging direction is formed at the distal end portion 33b.

Description

  The present invention relates to an electronic device in which an insertion opening through which a connection member is inserted is formed in a cover that closes an opening of a case.

  Conventionally, a control device disclosed in Patent Document 1 below is known as an electronic device in which an insertion opening through which a connection member is inserted is formed in a cover that closes an opening of a case. In this control device, a printed circuit board on which a connector member is mounted as a connection member connected to an external device is accommodated in a case. A cover is fitted to the opening side of the case, and the connecting terminal side of the connector member faces the outside of the case from the connector square hole portion of the cover. The printed circuit board accommodated in the case is supported by a pair of support rails and stoppers provided on the left and right inner wall surfaces of the case and a holding part formed on the cover. Thereby, the shakiness of the printed circuit board with respect to a case is suppressed.

JP 2000-261166 A

  By the way, as disclosed in Patent Document 1, in the configuration in which the cover in which the insertion opening through which the connection member is inserted is assembled to the case, in order to improve the assembling property of the cover with respect to the case, the guide portion is provided on the cover. It is conceivable that the guide portion is held and guided by a holding portion provided in the case. In this case, a predetermined gap is provided between the sandwiching portion and the guide portion in order to ensure assemblability.

  However, since the predetermined gap exists, the edge of the insertion opening comes into contact with the connection member when the insertion opening is inclined with respect to the connection member before insertion, and the cover can be assembled to the case. There is a problem of getting worse.

  It is also conceivable to set the tolerance of the guide part with respect to the gap dimension of the clamping part after setting the cover outer dimension in consideration of the warp of the case. However, since it is difficult to accurately set the dimension related to the surface guided by the holding portion of the guide portion, it is necessary to enlarge the opening for insertion of the cover as a result. On the other hand, if the insertion opening is simply enlarged in order to improve the assemblability, a gap is formed between the insertion opening and the connection member, and there is a high possibility that foreign matter will be mixed in or dew condensation in the case will occur. There is a problem of becoming.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an excessive gap between the connecting member and the insertion opening for inserting the connecting member. It is another object of the present invention to provide an electronic device that can improve the ease of assembling a cover to a case.

  In order to achieve the above object, in the electronic device according to claim 1, a substrate on which a connecting member for connecting to an external device is mounted, and the substrate is accommodated through a case opening. A case, a insertion opening for inserting the connection member, and a guide portion guided by being held by a holding portion formed in the case, and the connection member is inserted through the insertion opening. A cover that closes the case opening by guiding the guide portion to the holding portion and being assembled to the case in a state where the guide portion is inserted. A biasing portion for biasing and supporting the plate surface of the substrate accommodated in the case is formed during assembly of the guide portion and when the guide is completed, and the guide portion has a base end portion when the guide is completed. Above The distal end portion is guided by the holding portion and is guided by the clamping portion at the start of guidance, and the proximal end portion is configured such that the insertion opening portion is spaced from the connection member when the guidance is completed. It is formed so as to be positioned at a position to be eliminated, and a protruding portion is formed at the distal end portion so as to protrude with respect to the proximal end portion.

  According to a second aspect of the present invention, in the electronic device according to the first aspect, the protruding portion is formed such that a protruding length thereof becomes smaller as the base end portion side approaches the base end portion. To do.

  In the first aspect of the invention, the cover is formed with a biasing portion that biases and supports the plate surface of the substrate housed in the case during the assembly of the guide portion by the sandwiching portion and when the guidance is completed. The guide portion is formed such that the proximal end portion thereof is guided by the holding portion when the guidance is completed, and the distal end portion thereof is guided by the holding portion when the guidance is started. The proximal end portion is formed so that the insertion opening is positioned at a position where the gap with the connection member is eliminated when the guidance is completed, and the protruding portion is formed at the distal end portion so as to protrude from the proximal end portion. It is formed.

  Thus, when the guidance is completed with the proximal end portion of the guide portion held between the holding portions, the insertion opening is positioned at a position that eliminates the gap with the connection member, and the substrate is moved by the biasing portion. Since it is biased, it is possible to suppress the rattling of the substrate with respect to the case. Then, at the start of guidance in which the tip portion of the guide portion is held and guided by the holding portion, the protruding portion formed at the tip portion contacts the holding portion, so that the protruding portion is not formed at the tip portion. Thus, the inclination of the insertion opening with respect to the connection member is suppressed. For this reason, the edge of the insertion opening is less likely to come into contact with the connection member at the start of guidance, so that the cover can be easily assembled to the case without providing an excessive gap between the connection member and the insertion opening. be able to.

  In the invention of claim 2, the protruding portion is formed such that the protruding length becomes smaller as the proximal end portion side approaches the proximal end portion. If the protruding portion at the distal end portion is formed so as to form a step with respect to the proximal end portion, the guide of the protruding portion is not guided at the time of guiding the guide portion by the sandwiching portion due to the drag through the biasing portion. When finished, the proximal end portion is pressed so as to collide with the holding portion.

  Therefore, by forming the protruding portion so that the protruding length becomes smaller as the proximal end portion side approaches the proximal end portion, collision of the proximal end portion with the sandwiching portion is suppressed even when guidance of the protruding portion is finished. Thereby, the assembling property of the cover can be improved and a sudden change in the drag from the urging portion can be suppressed.

1 is a perspective view showing an electronic device according to a first embodiment. 2A is a cross-sectional view of the electronic device in FIG. 1 as viewed from the side, and FIG. 2B is a cross-sectional view as viewed from the top. It is explanatory drawing for demonstrating the detailed shape of the cover in 1st Embodiment, FIG. 3 (A) is a front view, FIG.3 (B) is a side view. FIG. 4A is a side view showing an assembled state before the circuit board is housed in the case in the first embodiment, and FIG. 4B is a side view showing the assembled state at the start of guidance. is there. FIG. 5C is a side view showing the assembled state during guidance by the protrusions of the guide portion in the first embodiment, and FIG. 5D is a side view showing the assembled state when guidance is completed. is there. It is explanatory drawing for demonstrating the detailed shape of the cover in 2nd Embodiment, FIG. 6 (A) is a front view, FIG.6 (B) is a side view. FIG. 7A is a side view showing the assembled state before the circuit board is housed in the case in the second embodiment, and FIG. 7B is a side view showing the assembled state at the start of guidance. is there. FIG. 8C is a side view showing the assembled state during guidance by the protrusions of the guide portion in the second embodiment, and FIG. 8D is a side view showing the assembled state when guidance is completed. is there. FIG. 9A is a side view showing the shape of the guide part according to the first modification of the embodiment, and FIG. 9B shows the shape of the guide part according to the second modification of the embodiment. FIG.

[First Embodiment]
Hereinafter, an electronic device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an electronic device 10 according to the first embodiment. 2A is a cross-sectional view of the electronic device 10 of FIG. 1 viewed from the side, and FIG. 2B is a cross-sectional view of the electronic device 10 viewed from the top. FIGS. 3A and 3B are explanatory views for explaining the detailed shape of the cover 30 in the first embodiment, FIG. 3A is a front view, and FIG. 3B is a side view.

  The electronic device 10 is mounted on a device affected by vibration, such as an automobile, and has a communication function for communicating with an external device (not shown) connected via a connector 42. As shown in FIGS. 1 and 2, the electronic device 10 has a resin case 20 formed in a substantially rectangular parallelepiped shape and a resin cover 30 that closes the case opening 21 of the case 20. It is configured.

  A support rail (not shown) for guiding and supporting the circuit board 40 is formed on the inner wall surface of the case 20, and the circuit board 40 is guided to the support rail through the case opening 21 and is supported by the case 20. Is housed inside. A predetermined wiring pattern is formed on the circuit board 40, and an electronic component 41 and the like for realizing the communication function and the like are mounted thereon. Further, a connector 42 is mounted in the vicinity of the outer edge of the upper plate surface 40a of the circuit board 40 as a connection member for connecting to the external device, corresponding to the predetermined wiring pattern.

  On the outer wall surface of the case 20 and in the vicinity of the case opening 21, a pair of holding portions 22 for guiding a guide portion 33 described later is provided. These both clamping parts 22 are each formed so that the upper end face 22a and the lower end face 22b parallel to each other face each other with a predetermined distance. Further, an engagement portion 23 is formed between the upper end surface 22a and the lower end surface 22b so as to protrude into an engagement opening 33c, which will be described later.

  The cover 30 closes the case opening 21 in a state where the connector 42 of the circuit board 40 accommodated in the case 20 is exposed. By this closing, the cover 30 enters the case 20 through the case opening 21. Foreign matter and condensation are prevented. As shown in FIGS. 3A and 3B, the cover 30 includes a substantially flat cover body 31 and two urging portions 32 that protrude from the vicinity of the lower end of the cover body 31 substantially orthogonally. And a pair of guide portions 33 projecting substantially orthogonally from both ends in the longitudinal direction with respect to the cover main body 31.

  The cover body 31 is formed with a rectangular insertion opening 31a at the center thereof according to the outer shape of the connector 42, and four engagement claws 31b for engaging with the inner wall of the case 20 at the four corners. Is formed. The insertion opening 31a is inserted so as to expose the connector 42 when each of the engaging claws 31b engages with the inner wall and the case opening 21 is closed by the cover main body 31. The gap between the edge of the common opening 31a and the connector 42 is formed as much as possible.

  The two urging portions 32 support the end portion on the connector side of the upper plate surface 40a of the circuit board 40 accommodated in the case 20 from above to below when the case opening 21 is closed by the cover body 31. Is to do. These urging portions 32 are formed in a tapered shape so that the lower surface of the urging portion 32 is located higher on the tip side (projecting side) in order to gradually increase the urging force on the upper plate surface 40a when closed.

  Both guide portions 33 are respectively guided by the clamping portion 22 when the case opening 21 is closed by the cover body 31, and the base end portion 33a is guided by the clamping portion 22 when the guide is completed, and the distal end portion 33b. Is configured to be guided by the clamping unit 22 at the start of guidance. In addition, an engagement opening 33c is formed at the center of the side surface of the guide portion 33 to engage and disengage the cover 30 and the case 20 by engaging with the engagement portion 23 at the time of closing.

  The proximal end portion 33 a is formed so that the insertion opening 31 a is positioned at a position where the gap with the connector 42 is eliminated when the guidance by the holding portion 22 is completed. Further, a protrusion 33d is formed on the distal end portion 33b so as to protrude downward with respect to the proximal end portion 33a. That is, the distal end portion 33b is formed to protrude by the protruding portion 33d so that the length in the urging direction (vertical direction) by the urging portion 32 is longer than the proximal end portion 33a.

  Next, attachment of the cover 30 to the case 20 that houses the circuit board 40 will be described with reference to FIGS. 4 and 5. 4A is a side view showing the assembled state before the circuit board 40 is accommodated in the case 20 in the first embodiment, and FIG. 4B shows the assembled state at the start of guidance. FIG. FIG. 5C is a side view showing an assembled state during guidance by the protrusion 33d of the guide portion 33 in the first embodiment, and FIG. 5D is a side view showing the assembled state when the guidance is completed. FIG.

  First, as shown in FIG. 4A, the circuit board 40 is inserted through the case opening 21 of the case 20 so as to be guided by the support rail. Next, after the circuit board 40 is accommodated in the case 20, the distal end portions 33 b (projection portions 33 d) of the both guide portions 33 of the cover 30 are guided to the both sandwiching portions 22 of the case 20. Immediately after the start of guidance, the connector 42 is not inserted through the insertion opening 31a.

  When the cover 30 is brought close to the case 20 with the distal end portion 33b guided to the holding portion 22, as shown in FIG. 4B, the connector 42 is inserted into the insertion opening 31a. At this time, since the protrusion 33d formed on the distal end portion 33b is in contact with the lower end surface 22b of the sandwiching portion 22, the protrusion 33d is formed on the upper plate surface 40a as compared with the case where the protrusion 33d is not formed on the distal end portion 33b. Regardless of the contact between the two urging portions 32, the inclination of the insertion opening 31a with respect to the connector 42 is suppressed.

  When the cover 30 is further brought closer to the case 20, as shown in FIG. 5C, the two urging portions 32 come into contact with the upper plate surface 40a so that the connector side end portion of the circuit board 40 faces from the upper side to the lower side. Be energized. Thereby, rattling of the circuit board 40 with respect to the case 20 is suppressed. At this time, since the connector 42 is already inserted into the insertion opening 31a, even if the edge of the insertion opening 31a contacts the connector 42, the assembly of the cover 30 to the case 20 may be deteriorated. Absent.

  When the cover main body 31 is approached from this state until the case opening 21 is closed, as shown in FIG. 5 (D), the guide by the distal end portion 33b (projection portion 33d) is finished, and the proximal end portion 33a is held by the clamping portion 22. When the engagement opening 33c engages with the engagement portion 23, the guidance is completed. In this guidance completion state, the engagement claw 31b of the cover main body 31 is engaged with the inner wall of the case 20, whereby the cover main body 31 is positioned with respect to the case opening 21.

  At the time of closing, the base end portion 33a is formed so that the insertion opening 31a is positioned at a position where the gap with the connector 42 is eliminated when guidance is completed. Does not occur.

  As described above, in the electronic apparatus 10 according to the present embodiment, the cover 30 has the upper plate surface 40a of the circuit board 40 accommodated in the case 20 during assembly of the guide portion 33 by the holding portion 22 and when the guide is completed. A biasing portion 32 that biases and supports is formed. The guide portion 33 is formed such that its proximal end portion 33a is guided by the sandwiching portion 22 when the guidance is completed, and its distal end portion 33b is guided by the sandwiching portion 22 when the guidance is started. The proximal end portion 33a is formed so that the insertion opening 31a is positioned at a position where the gap with the connector 42 is eliminated when the guidance is completed, and the distal end portion 33b is more biased than the proximal end portion 33a. A protruding protrusion 33d is formed.

  As a result, when the guide end 33a of the guide portion 33 is held and guided by the holding portion 22, the insertion opening 31a is positioned at a position where the gap with the connector 42 is eliminated, and is biased. Since the circuit board 40 is urged by the portion 32, rattling of the circuit board 40 with respect to the case 20 can be suppressed. At the start of guidance in which the distal end portion 33b of the guide portion 33 is sandwiched and guided by the sandwiching portion 22, the projection 33d formed on the distal end portion 33b comes into contact with the sandwiching portion 22 so that the insertion opening for the connector 42 is provided. The inclination of the part 31a is suppressed. For this reason, since the edge of the insertion opening 31a is less likely to contact the connector 42 at the start of guidance, the cover 30 is assembled to the case 20 without providing an excessive gap between the connector 42 and the insertion opening 31a. Can be improved.

[Second Embodiment]
Next, an electronic device according to a second embodiment of the present invention will be described with reference to FIGS. FIGS. 6A and 6B are explanatory views for explaining the detailed shape of the cover 30a in the second embodiment, FIG. 6A is a front view, and FIG. 6B is a side view. FIG. 7A is a side view showing an assembled state before the circuit board 40 is accommodated in the case 20 in the second embodiment, and FIG. 7B is a side view showing the assembled state at the start of guidance. FIG. FIG. 8C is a side view showing an assembled state during guidance by the projection 33d of the guide portion 33 in the second embodiment, and FIG. 8D is a side view showing the assembled state when the guidance is completed. FIG.

  The electronic device 10 according to the second embodiment differs from the electronic device according to the first embodiment in that a cover 30a is employed instead of the cover 30. Therefore, substantially the same components as those of the electronic device of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 6A and 6B, the cover 30 a is formed to have both urging portions 32 a instead of the urging portions 32 with respect to the cover 30. Both urging portions 32a urge and support the connector side end of the lower plate surface 40b of the circuit board 40 accommodated in the case 20 from below to above when the case opening 21 is closed by the cover body 31. Is to do. These urging portions 32a are formed in a taper shape so that the upper surface of the urging portion 32a is positioned lower toward the tip side (projecting side) in order to gradually increase the urging force against the lower plate surface 40b when closed.

In the electronic device 10 configured as described above, attachment of the cover 30a to the case 20 in which the circuit board 40 is accommodated will be described with reference to FIGS.
First, similarly to the first embodiment, the circuit board 40 is inserted through the case opening 21 of the case 20 (see FIG. 7A). Next, after the circuit board 40 is accommodated in the case 20, the distal end portions 33 b (projection portions 33 d) of the both guide portions 33 of the cover 30 a are guided to the both sandwiching portions 22 of the case 20.

  Then, when the cover 30a is brought close to the case 20 with the distal end portion 33b guided to the holding portion 22, as shown in FIG. 7B, the connector 42 is inserted into the insertion opening 31a. At this time, since the protrusion 33d formed on the distal end portion 33b is in contact with the lower end surface 22b of the sandwiching portion 22, the protrusion 33d is formed on the lower plate surface 40b as compared with the case where the protrusion 33d is not formed on the distal end portion 33b. Regardless of the contact between the two urging portions 32a, the inclination of the insertion opening 31a with respect to the connector 42 is suppressed.

  When the cover 30a is further brought closer to the case 20, as shown in FIG. 8C, the two urging portions 32a come into contact with the lower plate surface 40b so that the connector side end of the circuit board 40 faces from the lower side to the upper side. Be energized. Thereby, rattling of the circuit board 40 with respect to the case 20 is suppressed. At this time, since the connector 42 is already inserted into the insertion opening 31a, even if the edge of the insertion opening 31a contacts the connector 42, the assembly of the cover 30a to the case 20 may be deteriorated. Absent.

  When the cover body 31 is brought close to the case opening 21 from this state, as shown in FIG. 8D, the guide by the distal end portion 33b (projection portion 33d) is finished, and the proximal end portion 33a is held by the clamping portion 22 as shown in FIG. When the engagement opening 33c engages with the engagement portion 23, the guidance is completed.

  Thus, even if it is the structure which urges | biases and supports the connector side edge part of the lower board surface 40b of the circuit board 40 toward the upper direction from the downward direction by both the urging | biasing parts 32a, the connector 42 and the insertion opening part The assembling property of the cover 30a with respect to the case 20 can be improved without providing an excessive gap with 31a.

In addition, this invention is not limited to said each embodiment and its modification, You may actualize as follows.
(1) FIG. 9A is a side view showing the shape of the guide portion 33 according to the first modification of the embodiment, and FIG. 9B is a guide according to the second modification of the embodiment. 4 is a side view showing the shape of a portion 33. FIG.
As shown in FIG. 9A, as a first modification of the above-described embodiments, the protrusion 33d of the guide portion 33 has a protruding length that decreases as the proximal end portion side approaches the proximal end portion 33a. It may be formed. When the protrusion 33d of the distal end portion 33b is formed so as to form a step with respect to the proximal end portion 33a, the guide portion 33 by the clamping portion 22 is used for drag through the biasing portion 32 (32a). When the guide of the protrusion 33d is finished, the proximal end portion 33a is pressed so as to collide with the holding portion 22.

  Therefore, by forming the protruding portion 33d so that the protruding length becomes smaller as the proximal end portion side approaches the proximal end portion 33a, even if the guiding of the protruding portion 33d ends, the collision of the proximal end portion with the clamping portion 22 is prevented. It is suppressed. Thereby, while improving the assembly | attachment property of the cover 30 (30a), the sudden change of the drag from the urging | biasing part 32 (32a) can be suppressed.

  As shown in FIG. 9B, as a second modification of the above-described embodiments, the protrusion 33d of the guide portion 33 is formed so as to protrude from the proximal end portion 33a at the upper end and the lower end. Also good.

(2) The connecting member that is inserted into the insertion opening 31a without a gap is not limited to the connector 42. For example, even if a wire or the like is employed, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 10 ... Electronic device 20 ... Case 21 ... Case opening part 22 ... Clamping part 30, 30a ... Cover 31 ... Cover main body 31a ... Opening part 32, 32a ... Energizing part 33 ... Guide part 33a ... Base end part 33b ... Tip part 33d ... Projection 40 ... Substrate 42 ... Connector (connection member)

Claims (2)

A substrate on which a connection member for connecting to an external device is mounted;
A case in which the substrate is accommodated through a case opening;
An insertion opening for inserting the connection member and a guide portion guided by being held by a holding portion formed in the case, the connection member being inserted through the insertion opening. A cover that closes the case opening by being assembled to the case by guiding the guide portion to the clamping portion in a state;
An electronic device comprising:
The cover is formed with an urging portion that urges and supports the plate surface of the substrate accommodated in the case when the guide portion is assembled by the clamping portion and when the guide is completed.
The guide portion is formed such that a base end portion thereof is guided by the clamping portion when the guidance is completed, and a distal end portion thereof is guided by the clamping portion at the start of guidance,
The base end portion is formed so that the insertion opening is positioned at a position where the gap with the connection member is eliminated when the guidance is completed,
The electronic device according to claim 1, wherein a protrusion is formed at the distal end portion so as to protrude from the proximal end portion.   The electronic device according to claim 1, wherein the protruding portion is formed such that a protruding length thereof becomes smaller as the proximal end portion side approaches the proximal end portion.

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