JP2006287128A - Printed board holding structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printed board holding structure that the stress imposed on a printed board due to fixing can be reduced. <P>SOLUTION: In the printed board holding structure which holds the printed board when containing the printed board in the space made up of a case 2 and a cover 8, an arcuate notch 7 is formed on the inserting edge 9 of the printed board 1, and a first drum-shaped supporter 4 having a narrowed portion 10 is formed on a backward wall surface 3 opposed to the notch 7. When fitting the cover 8, the printed substrate 1 is held, the notch 7 and first supporter 4 abutting each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printed circuit board holding structure for holding a printed circuit board in an internal space of a housing.

  Conventionally, a method of soldering connection terminals provided on an electronic component onto a printed circuit board has been employed for mounting the electronic component on the printed circuit board. In recent years, along with the increase in the number of connection terminals, the miniaturization of electronic components has progressed remarkably, and accordingly, the connection terminals of electronic components have become narrower, the land area of printed circuit boards, and the wiring pitch have also decreased. As the process progresses, if the printed circuit board is warped or distorted, peeling of electronic components mounted on the printed circuit board is likely to occur.

  Also, with the recent increase in interest in the environment, so-called lead-free solder, which does not use lead, has come to be used as a solder material when soldering electronic components onto a printed circuit board. However, lead-free solder has a high melting point and has a characteristic that its viscosity is lower than that of conventional solder containing lead, and it has become difficult to obtain a soldering strength suitable for warping and distortion of a printed circuit board.

For example, Patent Document 1 discloses a holding structure that supports a printed circuit board on which electronic components are mounted. In Patent Document 1, a fitting groove for inserting and supporting both sides of a printed board is provided on both sides of a holder that supports a printed board on which an electronic component is mounted, and the printed board is placed inside the fitting groove. A protrusion is provided for pressing. When the printed circuit board is inserted into the holder, the printed circuit board is held and fixed by being pressed by the protrusions.
Japanese Utility Model Publication No. 62-204389

  However, if the printed circuit board is supported and fixed by the pressing by the protrusion, the printed circuit board may be warped or distorted by the pressing. The warpage and distortion cause stress on the electronic components mounted on the printed circuit board. Moreover, since there is a possibility that stress is applied to the solder that fixes the electronic component on the printed circuit board, the pressure on the printed circuit board causes a solder crack, and eventually leads to peeling of the electronic component from the printed circuit board. .

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to fix the printed board inside the housing without depending on the pressure on the printed board. In addition, another object of the present invention is to provide a printed circuit board holding structure capable of preventing the printed circuit board from being warped when the printed circuit board is incorporated in a housing.

  In order to solve the above problems, a printed circuit board holding structure according to a first aspect includes a printed circuit board on which an electronic component is mounted, a housing formed in a box shape having at least one surface as an opening surface, and the housing of the housing. In a printed circuit board holding structure that holds a printed circuit board when housed in an internal space formed by a cover that closes the opening surface, the printed circuit board has an arc-shaped notch at the front end of insertion into the internal space A first support portion is formed on the rear wall surface facing the opening surface of the housing so as to protrude into the internal space corresponding to the notch portion. The portion with which the part abuts has a constricted drum shape, and the cover holds the printed circuit board by bringing the cutout part of the printed circuit board into contact with the constricted part of the first support part.

  According to the first aspect of the present invention, a notch is provided at the front end of the printed circuit board, and a constriction is formed on the rear wall surface of the housing so as to protrude into the internal space corresponding to the notch. A drum-shaped first support portion having a portion is provided. For this reason, even if it does not press a printed circuit board, a printed circuit board can be held by abutting a notch part formed in the insertion front end part of a printed circuit board, and the 1st support part formed in the back wall surface. it can. That is, since there are enlarged diameter portions on the both sides of the constricted portion of the first support portion, the diameter of the enlarged portion gradually increases as compared with the constricted portion. It is locked to the diameter portion, and unnecessary movement of the printed circuit board is prevented.

  The printed circuit board holding structure according to claim 2 is configured such that when the cutout portion of the printed circuit board comes into contact with the constricted portion of the first support section, the printed circuit board is inserted between the side surface of the front end of the printed circuit board and the rear wall surface of the housing. Is characterized in that a gap is formed. According to the second aspect of the present invention, when the printed circuit board is disposed in the internal space of the housing, the printed circuit board is notched due to the contact between the side surface of the front end of the printed circuit board and the rear wall surface of the housing. Can be prevented from reaching the first support portion. That is, a gap is formed between the side surface of the front end of the printed circuit board and the rear wall surface of the housing, so that the notch formed in the front end of the printed circuit board is securely connected to the first support section. Can abut.

  In the printed circuit board holding structure according to claim 3, the cover is formed with a second support portion so as to protrude into the internal space, and the second support portion has both sides of the rear end of the printed circuit board inserted. And the movement of the rear end portion is limited. According to the third aspect of the present invention, even if the rear end of the printed board is moved due to, for example, vibration from the outside, the movement is locked, and the printed board can be prevented from moving. In particular, movement in a direction perpendicular to the surface of the printed circuit board can be prevented, and the printed circuit board is stably held in the housing.

  In the printed circuit board holding structure according to claim 4, the casing serves as a guide when inserting the printed circuit board into the internal space inside the both side walls, and supports both sides of the printed circuit board when the internal space is stored. It has the rail which carries out. According to the fourth aspect of the invention, the rail guides the printed circuit board to a predetermined position and serves as a guide for arranging the printed circuit board, and the printed circuit board can be disposed at the predetermined position. Furthermore, since the rail holds both sides of the printed circuit board disposed at a predetermined position, the printed circuit board can be more stably held in the internal space of the housing.

  The printed circuit board holding structure according to claim 5 is characterized in that the first support portion is formed integrally with the rear wall surface. According to the fifth aspect of the present invention, if the first support portion is incorporated in the mold for molding the rear wall surface of the casing in advance, the increase in cost related to the molding of the first support body is minimized. Can be fastened.

  In the printed circuit board holding structure according to claim 6, the first support portion is provided at a plurality of locations on the rear wall surface of the housing, and a plurality of cutout portions of the printed circuit board correspond to the first support portion. It is provided at a location. According to the sixth aspect of the present invention, a plurality of first support portions and notch portions are provided so as to correspond to each other. For this reason, since the plurality of notched portions formed at the insertion front end of the printed circuit board abut against the plurality of first support parts, the printed circuit board can be more stably held in the internal space of the housing. it can.

  According to a seventh aspect of the present invention, there is provided a printed circuit board holding structure including a housing formed in a box shape having at least one surface as an opening surface, and a cover for closing the opening surface of the housing. In the printed circuit board holding structure for holding the printed circuit board when housed in the internal space, the printed circuit board has an arc-shaped protruding portion formed at the front end of insertion into the internal space. The opposing rear wall surface is formed with a first support portion corresponding to the protruding portion so that the rear wall surface is depressed, and the first support portion has a barrel shape in which a portion with which the protruding portion abuts is inflated. And the cover is configured to hold the printed circuit board by bringing the protruding portion of the printed circuit board into contact with the bulge of the first support section.

  According to the invention described in claim 7, the arcuate protrusion is provided at the insertion front end of the printed circuit board, and the rear wall surface of the housing corresponds to the protrusion so that the rear wall surface is depressed. 1 support portion is provided. For this reason, even if it does not press a printed circuit board, a printed circuit board can be held by the projection part formed in the insertion front end part of a printed circuit board, and the 1st support part formed in the back wall surface contacting. . That is, since there are reduced diameter portions whose diameter gradually decreases from the bulge portion on both sides of the bulge portion of the first support portion, even if the printed circuit board tries to move, the protruding portion of the printed circuit board has its reduced diameter. The movement of the printed circuit board is prevented.

  In the printed circuit board holding structure according to claim 8, when the protruding portion of the printed circuit board comes into contact with the bulge portion of the first support section, the printed circuit board holding structure is interposed between the side surface of the front end of the printed circuit board and the rear wall surface of the housing. Is characterized in that a gap is formed. According to the invention described in claim 8, when the printed circuit board is disposed in the internal space of the housing, the protruding portion of the printed circuit board is caused by the contact between the side surface of the front end of the printed circuit board and the rear wall surface of the housing. A state in which the first support portion is not reached can be avoided. In other words, a gap is formed between the side surface of the front end of the printed circuit board and the rear wall surface of the housing, so that the protrusion formed on the front end of the printed circuit board can be reliably brought into contact with the first support section. You can touch.

  In the printed circuit board holding structure according to claim 9, the cover is formed with a second support part so as to protrude into the internal space, and the second support part has the insertion rear end of the printed circuit board on both sides thereof. And the movement of the rear end portion is limited. According to the ninth aspect of the present invention, even if the rear end portion of the printed board is about to move due to, for example, vibration from the outside, the movement is locked, and the printed board can be prevented from moving. In particular, movement in a direction perpendicular to the surface of the printed circuit board can be prevented, and the printed circuit board is stably held in the housing.

  In the printed circuit board holding structure according to claim 10, the casing serves as a guide when inserting the printed circuit board into the internal space on both side walls, and supports both sides of the printed circuit board when the internal space is stored. It has the rail which carries out. According to the tenth aspect of the present invention, the rail guides the printed circuit board to a predetermined position and serves as a guide for arranging the printed circuit board, so that the printed circuit board can be disposed at the predetermined position. Furthermore, since the rail holds both sides of the printed circuit board disposed at a predetermined position, the printed circuit board can be more stably held in the internal space of the housing.

  The printed circuit board holding structure according to claim 11 is characterized in that the first support portion is formed integrally with the rear wall surface. According to the eleventh aspect of the present invention, if the first support portion is incorporated in the mold for molding the rear wall surface of the housing in advance, the increase in cost related to the molding of the first support body is minimized. Can be fastened.

  In the printed circuit board holding structure according to claim 12, the first support portion is provided at a plurality of locations on the rear wall surface of the housing, and the protruding portion of the printed circuit board also corresponds to the first support portion. It is provided in. According to the twelfth aspect of the present invention, a plurality of first support portions and projecting portions are provided so as to correspond to each other. For this reason, since the plurality of protrusions formed at the insertion front end of the printed circuit board abut against the plurality of first support parts, the printed circuit board can be more stably held in the internal space of the housing. .

  The printed circuit board holding structure according to a thirteenth aspect is characterized in that the housing and the support portion are made of a resin material. As for the housing | casing which has a structure described in Claims 1 thru | or 12, you may comprise a housing | casing from a resin material like Claim 13. Thus, by comprising a housing | casing with a resin material, a housing | casing can be reduced in weight rather than comprising a housing | casing with a metal material, for example.

  The printed circuit board holding structure according to the fourteenth aspect is characterized in that the casing is used in an engine ECU of a vehicle. The housing having the holding structure described in claims 1 to 13 is suitable for an engine ECU of a vehicle as described in claim 14. An engine ECU of a vehicle is required to be lighter, but a large external force such as vibration from the vehicle acts on the engine ECU, so that the printed circuit board is required to be held more stably. If the above-described holding structure is adopted for such an engine ECU, the printed circuit board can be securely held, and therefore the printed circuit board can be prevented from moving in the internal space of the housing by vibration.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the electronic device described in this embodiment can be used in an ECU (Electric Control Unit) installed at each position of a vehicle where vibration occurs during operation. Among these, it is suitable for an engine ECU disposed in an engine room where particularly large vibrations occur.
(First embodiment)
1 to 8 are views for explaining a printed circuit board holding structure according to the first embodiment of the present invention. As shown in FIGS. 1 to 8, reference numeral 1 denotes a printed circuit board on which electronic components and the like are mounted and soldered. An arc-shaped cutout portion 7 is formed at a position where the printed board 1 comes into contact with the first support portion 4 when the printed board 1 is accommodated in the housing 2.

  Reference numeral 2 denotes a housing for storing the printed circuit board 1 therein. The housing 2 is formed of, for example, a resin that can be easily processed and can keep the surface smooth. Rails 5 that support both side portions 16 and 17 of the printed circuit board 1 are provided on the inner space side of the side walls 11 a and 11 b of the housing 2. Here, the interval W2 between the side walls 11a and 11b is formed larger than the width W1 of the printed circuit board 1 so that the printed circuit board 1 can be easily inserted into the housing 2.

  Reference numeral 3 denotes a rear wall surface of the housing 2, and a first support portion 4 is formed on the rear wall surface 3 so as to protrude into the housing 1. The first support portion 4 may be formed integrally with the rear wall surface 3 when forming the housing 2, or is fixed to the rear wall surface 3 with an adhesive or the like after the first support portion 4 is formed. May be. As shown in FIG. 6, the first support portion 4 is formed in a drum shape having a constricted portion 10 and a curved portion (expanded portion) 14 whose diameter gradually increases from the constricted portion 10. Alternatively, as shown in FIG. 7, the first support portion 4 may be formed in a bobbin shape for a bobbin whose side surfaces are composed of a curved portion (expanded portion) 14 and a straight portion 15. The 1st support part 4 is formed so that it may become a smooth protrusion part surface.

  When the printed circuit board 1 is stored in the housing 2, the first support portion 4 (neck portion 10) and the notch portion 7 come into contact with each other as shown in FIGS. 6 and 7. As shown in FIG. 5A, the surface where the rail 5 contacts the side portions 16 and 17 of the printed circuit board 1 is provided at substantially the same height as the position where the diameter of the constricted portion 10 is the smallest. As shown in FIG. 5B, the rail 5 may have a shape in which concave notches are provided in both side walls 11a and 11b.

  Reference numeral 8 denotes a cover formed in a U shape that closes the opening surface 6 of the housing 2 after the printed circuit board 1 is stored in the internal space of the housing 2. As shown in FIG. 2, second support portions 13 a and 13 b that sandwich the rear end portion 12 of the printed circuit board 1 accommodated from the both surfaces of the cover 8 protrude from the inner surface of the cover 8 into the internal space of the housing 2. It is formed to do.

  Next, a printed circuit board holding structure when the printed circuit board 1 is stored in the internal space of the housing 2 will be described with reference to FIGS. 3 and 4. Inserted into the internal space of the housing 2 along the rails 5 provided inside the side walls 11a and 11b from the opening surface 6 of the housing 2 with the insertion front end 9 of the printed circuit board 1 as the head. . At this time, the distance W2 between the side walls 11a and 11b is larger than the width W1 of the printed circuit board. Therefore, the printed circuit board 1 can be easily stored in the internal space of the housing 2. The rails 5 hold both side portions 16 and 17 of the printed circuit board 1.

  When the printed circuit board 1 is housed in the housing 2, as shown in FIGS. 4 (a) and 4 (b), the notch 7 formed in the insertion front end 9 is located on the inner space side of the rear wall 3. The first support portion 4 (constriction portion 10) formed so as to protrude in the direction of contact. Then, the front insertion end 9 of the printed circuit board 1 is positioned, and the front insertion end 9 of the printed circuit board 1 is temporarily fixed to the rear wall surface 3. Then, after temporarily fixing the insertion front end 9 of the printed circuit board 1, the cover 8 is assembled to the housing 2 while closing the opening 6 with the cover 8. At this time, the insertion rear end portion 12 of the printed circuit board 1 is sandwiched from both surfaces by the second support portions 13a and 13b provided on the inner surface of the cover 8, and the insertion rear end portion 12 is positioned. The entire printed circuit board 1 is held. For example, fitting means (claw fitting, screw fastening, etc.) (not shown) is used for assembling the cover 8 to the housing 2.

  As shown in FIGS. 6 and 7, the cutout portion 7 is formed in an arc shape whose diameter is R1, but R1 is substantially the same as the diameters R2 and R2 ′ of the constricted portion 10, or R2, R2 By setting it larger than ', the notch 7 and the constricted part 10 abut easily. As shown in FIG. 8, the first support portion 4 and the cutout portion 7 are formed so as to correspond to each other, but the number thereof may be singular or plural.

  Here, as shown in FIGS. 4A to 4C, when the printed circuit board 1 is stored in the internal space of the housing 2, the side surface of the insertion front end 9 of the printed circuit board 1 and the rear of the housing 2. A clearance 18 of about 0.2 to 0.3 millimeters is preferably formed between the wall 3. When such a gap 18 is formed when the printed circuit board 1 is stored in the internal space of the housing 2, contact between the side surface of the insertion front end 9 of the printed circuit board 1 and the rear wall surface 3 of the housing 2, A state in which the cutout portion 7 of the printed circuit board 1 cannot reach the first support portion 4 can be avoided. That is, by forming the gap 18, the cutout portion 7 formed at the insertion front end portion 9 of the printed circuit board 1 can be brought into contact with the first support portion 4 with certainty.

  By the way, external force such as vibration acts on the housing 2 or the printed circuit board 1 held in the internal space of the housing 2 is warped, distorted, or expanded due to an environment such as temperature and humidity. Such a change may occur. When such a change occurs, stress is generated in the printed circuit board 1, but it is not preferable in terms of reliability to leave the printed circuit board 1 while the stress is generated. In the present embodiment, for example, as shown in FIG. 4C, the cutout portion 7 of the printed circuit board 1 is in contact with the constricted portion 10 of the first support portion 4 formed in a drum shape, The stress generated in the printed circuit board 1 can be released by moving in the direction.

As described above, the cutout portion 7 formed at the insertion front end portion 9 of the printed circuit board 1 and the constricted portion 10 of the drum-shaped first support portion 4 come into contact with each other, whereby the printed circuit board 1 is attached to the housing 2. Can be firmly held. Even if some stress is generated on the printed circuit board 1, the cutout portion 7 of the printed circuit board 1 moves according to the constricted portion 10 to release the stress. However, since the enlarged diameter portions 18 are formed on both sides of the constricted portion 10, the notched portion 7 is prevented from moving more than necessary.
(Second Embodiment)
Next, a printed circuit board holding structure according to the second embodiment of the present invention will be described with reference to FIGS. In addition, the same reference number is attached | subjected to the component same as 1st Embodiment, and description is partially abbreviate | omitted.

  As shown in FIGS. 9 to 14, reference numeral 21 denotes a printed circuit board on which electronic components and the like are mounted and soldered. An arc-shaped protruding portion 27 is formed at a position where the printed board 21 comes into contact with the first support portion 24 when the printed board 21 is inserted into the housing 22.

  Reference numeral 22 denotes a housing that accommodates the printed circuit board 21 and is formed of a resin that can be easily processed and can keep the surface smooth. Rails 5 that support both sides 36 and 37 of the printed circuit board 21 from below are provided inside both wall surfaces of the housing 22. The interval W4 between the side walls 31a and 31b of the housing 22 is formed larger than the width W3 of the printed circuit board 21 so that the printed circuit board 21 can be easily inserted into the housing 22.

  Reference numeral 23 denotes a rear wall surface of the housing 22, and a first support portion 24 is formed on the rear wall surface 23 so as to be a recessed portion in which the rear wall surface 23 is depressed. The first support portion 24 is formed integrally with the rear wall surface 23 when the housing 22 is formed. Alternatively, it may be cut out after the rear wall surface 23 is formed. As shown in FIG. 14, the first support portion 24 is formed in a barrel shape having a bulge portion 30 and a curved portion (reduced diameter portion) 34 whose diameter gradually decreases from the bulge portion 30 at the center portion of the cylinder, It is formed to have a smooth concave surface.

  When the printed circuit board 21 is housed in the housing 22, as shown in FIG. 14, the first support portion 24 (bulge portion 30) and the protruding portion 27 come into contact with each other. As shown in FIG. 13, the surface of the rail 5 that contacts the side portions 36 and 37 of the printed circuit board 21 is provided at substantially the same height as the position where the diameter of the bulge portion 30 is the largest. Although not shown, the rail 5 may have a shape in which a concave cut is provided in each of the side walls 31a and 31b.

  Reference numeral 28 denotes a U-shaped cover that closes the opening 6 after the printed circuit board 21 is stored in the internal space of the housing 22. As shown in FIG. 10, on the inner surface side of the cover 28, second support portions 33 a and 33 b that sandwich the inserted rear end portion 32 of the printed circuit board 21 from both surfaces protrude into the internal space of the housing 22. It is formed to do.

  Next, a printed circuit board holding structure when the printed circuit board 21 is housed in the housing 22 will be described with reference to FIGS. 11 and 12. Inserted into the internal space of the housing 21 along the rail 5 provided inside the side walls 31a and 31b from the opening surface 26 of the housing 22 with the front end 29 of the printed circuit board 21 as the head. . At this time, the distance W4 between the side walls 31a and 31b is larger than the width W3 of the printed circuit board. Therefore, the printed circuit board 21 can be easily stored in the housing 22. The rails 5 hold both side portions 36 and 37 of the printed circuit board 1.

  When the printed circuit board 21 is housed in the housing 22, as shown in FIGS. 12A and 12B, the protruding portion 27 formed on the insertion front end 29 has a recess recessed in the rear wall surface 23. It abuts on the first support portion 24 (bulge portion 30) formed to be. Then, the front insertion end portion 29 of the printed circuit board 21 is positioned, and the front insertion end portion 29 of the printed circuit board 21 is temporarily fixed to the rear wall surface 23. Then, after temporarily fixing the insertion front end portion 29 of the printed circuit board 21, the cover 28 is assembled to the housing 22 while closing the opening surface 26 with the cover 28. At this time, the insertion rear end portion 32 of the printed circuit board 21 is sandwiched from both surfaces by the second support portions 33a and 33b provided on the inner surface of the cover 28, and positioning of the insertion rear end portion 32 is performed. The entire printed circuit board 21 is held. For example, fitting means (claw fitting, screw tightening, etc.) (not shown) is used for assembling the cover 28 to the housing 22.

  As shown in FIG. 14, the protruding portion 27 is formed in an arc shape whose diameter is R3, but by setting R3 to be substantially the same as the diameter R4 of the bulging portion 30 or larger than R4, The protrusion part 27 and the bulge part 30 contact | abut easily. Although not shown, the first support portion 24 and the protruding portion 27 are formed so as to correspond to each other, but the number thereof may be singular or plural.

  Here, as shown in FIG. 12, when the printed circuit board 21 is stored in the internal space of the housing 22, between the side surface of the insertion front end portion 29 of the printed circuit board 21 and the rear wall surface 23 of the housing 22, A gap 38 of about 0.2 to 0.3 mm is preferably formed. When such a gap 38 is formed when the printed circuit board 21 is stored in the internal space of the housing 22, due to the contact between the side surface of the insertion front end 29 of the printed circuit board 21 and the rear wall surface 23 of the housing 22, A state in which the protruding portion 27 of the printed circuit board 1 cannot reach the first support portion 24 can be avoided. That is, by forming the gap 38, the protruding portion 27 formed at the insertion front end portion 29 of the printed circuit board 21 can surely come into contact with the first support portion 24.

  By the way, external force such as vibration acts on the housing 22 or the printed circuit board 21 held in the internal space of the housing 22 is warped, distorted, or expanded due to an environment such as temperature and humidity. Such a change may occur. When such a change occurs, stress is generated in the printed circuit board 21, but it is not preferable in terms of reliability to leave the printed circuit board 21 while the stress is generated. In the present embodiment, for example, as shown in FIG. 12C, the protruding portion 27 of the printed circuit board 21 is in contact with the bulging portion 30 of the first support portion 24 formed in a barrel shape, and in the direction of the arrow. The stress generated in the printed circuit board 21 can be released.

  As described above, the protruding portion 27 formed at the insertion front end portion 29 of the printed circuit board 21 and the bulging portion 30 of the barrel-shaped first support portion 24 come into contact with each other, so that the printed circuit board 21 is attached to the housing 22. Can hold firmly. Even if some stress is generated on the printed circuit board 21, the projecting portion 27 of the printed circuit board 21 moves according to the bulging portion 30 to release the stress. However, since the reduced diameter portion 38 is formed on both sides of the bulge portion 30, the protrusion 27 is prevented from moving more than necessary.

  Although the best mode for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. is there. In the invention according to the dependent claims of the present invention, a part of the constituent features of the dependent claims can be omitted.

  For example, the cutout portion 7 shown in the first embodiment is formed also in the rear end portion 12 of the printed board 1 and the first support portion is used instead of the second support portion 13 formed in the cover 8. 4 is formed. When the cover 6 closes the opening 6 of the housing 2, the insertion rear end portion 12 and the first support portion 4 formed on the cover 8 are in contact with each other. It is good also as a simple structure. Further, the protruding portion 27 shown in the second embodiment is also formed at the insertion rear end portion 32 of the printed circuit board 21, and the first support portion 24 is replaced with the second support portion 33 formed on the cover 28. When the support portion having substantially the same shape is formed and the opening 28 of the housing 22 is closed with the cover 28, the shape is almost the same as that of the first support portion 24 formed on the rear end portion 32 and the cover 28. It is good also as a structure which contacts this support part.

  In the present embodiment, a printed circuit board holding structure that can be used in an engine ECU of a vehicle has been described. However, the present invention is not limited to this, and the present invention is effective when used in an electronic device for any application.

The disassembled perspective view of the housing | casing which employ | adopted the holding structure of the printed circuit board which concerns on the 1st Embodiment of this invention. Sectional drawing of the housing | casing which employ | adopted the printed circuit board holding structure which concerns on the 1st Embodiment of this invention. The perspective view from the upper surface of the housing | casing which employ | adopted the printed circuit board holding structure which concerns on the 1st Embodiment of this invention FIG. 4 is an enlarged view of the vicinity of a broken line CC ′ in FIG. 3, (a) is a top view, (b) is a cross-sectional view taken along line E-E ′ in (a), and (c) is a diagram in which the printed circuit board 1 is moved. FIG. 3A is a cross-sectional view taken along line A-A ′ of FIG. 3, and FIG. 4B is a view in which concave notches are formed on both side walls 11 a and 11 b as rails. The enlarged view of the location where a notch part and a 1st support part contact | abut based on the 1st Embodiment of this invention. The enlarged view of the location which the notch part and the 1st support part from which a shape differs contact | abuts The figure which made the notch part and the 1st support part plural. The disassembled perspective view of the housing | casing which employ | adopted the printed circuit board holding structure which concerns on the 2nd Embodiment of this invention. Sectional drawing of the housing | casing which employ | adopted the printed circuit board holding structure which concerns on the 2nd Embodiment of this invention. The perspective view from the upper surface of the housing | casing which employ | adopted the printed circuit board holding structure which concerns on the 2nd Embodiment of this invention. FIG. 12 is an enlarged view of the vicinity of a broken line H-H ′ in FIG. 11, (a) is a top view, (b) is a K-K ′ cross-sectional view of (a), and (c) is a view in which the printed circuit board 21 is moved. F-F 'sectional view of FIG. The enlarged view of the location which the protrusion part and 1st support part contact based on the 2nd Embodiment of this invention

Explanation of symbols

1, 21 Printed circuit board 2, 22 Housing 3, 23 Rear wall surface 4, 24 First support part 5 Rail 6, 26 Opening surface 7 Notch part 8 Cover 9, 29 Print board insertion front end part 10 Constriction part 11, 11a, 11b, 31, 31a, 31b Side walls 12, 32 Inserted rear end portions 13, 13a, 13b, 33, 33a, 33b of the printed circuit board Second support portion 14 Curved portion (expanded diameter portion) of the first support portion
15 Linear portions 16, 17, 36, 37 of the first support portion Side portions 18, 38 of the printed board Gap 27 Projection portion 30 Swelling portion 34 Curve portion (reduced diameter portion) of the first support portion
100, 101, 102 Electronic device W1 Width W2 of printed circuit board 1 Interval W3 between side walls 11a and 11b W3 Width of printed circuit board 21 Width R4 between side walls 31a and 31b R1 Radius R2 of notch 7 and radius R3 of constricted portion 10 Radius R4 of the bulge 30 Radius of the protrusion 27

Claims (14)

When the printed circuit board on which the electronic component is mounted is stored in an internal space formed by a box-shaped housing having at least one surface as an opening surface and a cover that closes the opening surface of the housing, the print In the printed circuit board holding structure that holds the board,
In the printed circuit board, an arc-shaped notch is formed at the insertion front end to the internal space,
On the rear wall surface facing the opening surface of the housing, a first support portion is formed so as to protrude into the internal space corresponding to the cutout portion. The part where the cut portion abuts has a constricted drum shape,
A printed circuit board holding structure, wherein the printed circuit board is held by the cover so that the cutout portion of the printed circuit board is brought into contact with the constricted portion of the first support portion.   When the cutout portion of the printed circuit board comes into contact with the constricted portion of the first support section, a gap is formed between the side surface of the front end portion of the printed circuit board and the rear wall surface of the housing. The printed circuit board holding structure according to claim 1.   The cover is formed with a second support portion so as to protrude into the internal space, and the second support portion sandwiches the rear end portion of the printed circuit board from both sides thereof, and the rear end portion. 3. The printed circuit board holding structure according to claim 1, wherein movement of the printed circuit board is limited.   The casing serves as a guide for inserting the printed circuit board into the internal space on both side walls, and has rails for supporting both sides of the printed circuit board when the internal space is stored. The printed circuit board holding structure according to any one of claims 1 to 3.   The printed circuit board holding structure according to claim 1, wherein the first support portion is integrally formed with a rear wall surface. The first support portion is provided at a plurality of locations on the rear wall surface of the housing,
6. The printed circuit board holding structure according to claim 1, wherein the cutout portion of the printed circuit board is also provided at a plurality of locations corresponding to the first support portion. When the printed circuit board on which the electronic component is mounted is stored in an internal space formed by a box-shaped housing having at least one surface as an opening surface and a cover that closes the opening surface of the housing, the print In the printed circuit board holding structure that holds the board,
In the printed circuit board, an arc-shaped protrusion is formed at an insertion front end portion in the internal space,
A first support portion is formed on the rear wall surface facing the opening surface of the housing so as to correspond to the projecting portion so that the rear wall surface is depressed, and the first support portion is the projecting portion. The part that abuts has a bulging barrel shape,
The printed circuit board holding structure is characterized in that the printed circuit board is held by causing the protruding portion of the printed circuit board to abut against the bulge portion of the first support portion by the cover.   When the protruding portion of the printed circuit board comes into contact with the bulge portion of the first support portion, a gap is formed between the side surface of the front end portion of the printed circuit board and the rear wall surface of the housing. The printed circuit board holding structure according to claim 7, wherein:   The cover is formed with a second support portion so as to protrude into the internal space, and the second support portion sandwiches the rear end portion of the printed circuit board from both sides thereof, and the rear end portion. 9. The printed circuit board holding structure according to claim 7, wherein movement of the printed circuit board is limited.   The casing serves as a guide for inserting the printed circuit board into the internal space on both side walls, and has rails for supporting both sides of the printed circuit board when the internal space is stored. A printed circuit board holding structure according to any one of claims 7 to 9.   The printed circuit board holding structure according to claim 7, wherein the first support portion is formed integrally with a rear wall surface. The first support portion is provided at a plurality of locations on the rear wall surface of the housing,
12. The printed circuit board holding structure according to claim 7, wherein projecting portions of the printed circuit board are also provided at a plurality of locations corresponding to the first support portion. 13.   The printed circuit board holding structure according to claim 1, wherein the housing and the first and second support portions are made of a resin material.   The printed circuit board holding structure according to claim 1, wherein the casing is used in an engine ECU of a vehicle.

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