JP2007317946A - Attaching structure for printed board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching structure for printed boards wherein the attachment of a printed board to a molded housing is made easy by it, and it can deal with the alteration of the size of the printed board without the alteration of the molded housing. <P>SOLUTION: In the attaching structure for printed boards wherein a printed board 1 is attached to a molded housing 23 of an electronic appliance in whose two side surfaces opposed to each other many louvers 21 are formed, the printed board is fastened to the molded housing via fastening tools 31. Each fastening tool is attached removably to one of the four corners of the printed board, and has each elastic piece 43 having such a locking portion 55 as to be engaged removably with each louver. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printed circuit board mounting structure for mounting a printed circuit board to a mold housing of an electronic device.

  Today, many electronic components are mounted on a printed circuit board and attached to a mold housing of an electronic device. Conventionally, as a structure for attaching a printed circuit board to a mold housing, Patent Document 1 or FIGS. As shown in FIG. 13, a screw base 9 is integrally provided at the bottom 7 of the mold housing 5 corresponding to the screw holes 3 provided at the two corners of the printed circuit board 1, and the insertion side end 11 of the printed circuit board 1 is formed as shown in FIG. A structure in which the printed circuit board 1 is screwed to the screw fixing base 9 with a fixing screw 15 after being inserted into the receiving portion 13 of the mold housing 5 is widely known.

12 (a) and 12 (c) are inner side views of the left and right side surfaces 17 and 19 of the mold housing 5, and FIG. 12 (b) is a plan view of the bottom portion 7 of the mold housing 5. 19 is provided with a plurality of slit-like air holes 21 at equal pitches in the vertical direction of the mold housing 5.
Further, in recent years, instead of the screw base 9, two locking claws are integrally projected on the bottom of the mold housing according to the size of the printed board 1 (L in FIG. 11), and the printed board is inserted. An attachment structure is also used in which, after the side end portion is inserted into the receiving portion of the mold housing, the rear end portion of the printed circuit board is locked to the locking claw with one touch.
JP 2000-340971 A

  However, since the screw mounting base 9 is integrally formed with the mold casing 5, once the mold casing 5 is designed, the circuit board 1-1 can be formed as shown in FIG. When the size (L1) in the vertical direction is changed (L> L1), a new mold casing 5 − having a different position of the screw base 9 as shown in FIGS. 15 and 16 is used to change the mold casing. There was a disadvantage that a mold design of 1 was generated and it was very expensive.

In addition, even in series products with different printed circuit board sizes, the mold housing cannot be diverted, and it is necessary to create respective molds.
The present invention has been devised in view of such circumstances, and it is easy to attach the printed circuit board to the mold housing, and when the size of the printed circuit board is changed, it is possible to cope without changing the mold housing. An object of the present invention is to provide a possible printed board mounting structure.

  In order to achieve such an object, the invention according to claim 1 is directed to a printed circuit board mounting structure in which a printed circuit board is mounted on a mold housing of an electronic device in which a large number of air holes are formed on a side surface. The printed circuit board is fixed to the mold housing via a fixing tool provided with an elastic piece having a lock portion that is detachably attached to the air hole and is detachably engaged with the air hole.

  According to a second aspect of the present invention, in the printed circuit board mounting structure according to the first aspect, the fixture is provided with a slit for sandwiching a corner of the printed circuit board. The invention according to claim 2 is characterized in that, in the printed board mounting structure according to claim 2, a slope portion for guiding the printed board to be inserted into the slit inward is provided at the board insertion port of the slit. .

  According to a fourth aspect of the present invention, in the printed circuit board mounting structure according to the second or third aspect, a boss that engages with a screw hole provided in a corner of the printed circuit board is provided in the slit. According to a fifth aspect of the present invention, in the printed circuit board mounting structure according to the fourth aspect, the boss has an inclined surface portion for guiding the printed circuit board inserted into the slit inward. It is provided.

Furthermore, the invention according to claim 6 is the printed board mounting structure according to any one of claims 1 to 3, wherein the inner wall surface of the slit with which the corner of the printed board abuts is inclined. In addition, the corners of the printed circuit board are chamfered along the inclined surface.
According to a seventh aspect of the present invention, in the printed circuit board mounting structure according to any one of the first to sixth aspects, a release lever having a Z-shape in front view is provided at the tip of the elastic piece. It is a thing.

  According to the invention according to each claim, by using a detachable fixing tool in the air hole of the mold casing, it is possible to uniformly fix printed circuit boards of different sizes to one mold casing. Even if the printed circuit board expands or contracts due to specification changes, it can be handled without changing the mold housing, and the mold housing can be diverted to series products that differ only in the size of the printed circuit board. .

However, since the fixture has no directionality and can be attached to the printed circuit board by being inverted, only one type of fixture needs to be prepared, and there is no manufacturing cost of the fixture. There is no need for troublesome product management.
And since the size of the printed circuit board can be changed for each pitch of the air holes of the mold housing, the versatility of the mold housing is high, and in addition, when the printed circuit board is cut into an L shape, for example, and fixed to the mold housing In addition, the thickness of the fixture can be adjusted, and it can also serve as a pedestal that determines the height of the printed circuit board.

In addition, according to the inventions according to claim 3 and claim 5, since the inclined portion is provided at the board insertion port and the boss of the slit, the fixture can be easily attached to the printed board and the board is inserted into the slit. The provision of the inclined surface at the mouth facilitates the removal of the printed circuit board and has an advantage of excellent recyclability.
Further, according to the invention of claim 6, even if the printed circuit board has different sizes in the vertical and horizontal directions due to a sudden specification change, it is possible to cope without changing the mold housing. According to the invention, the fixing tool can be easily detached from the mold housing by operating the release lever, and the printed circuit board can be easily attached to and detached from the mold housing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same thing as the prior art example of FIG. 11 or less is displayed with the same code | symbol.
1 to 4 are resin-made fixtures used in a printed circuit board mounting structure according to one embodiment of claims 1 to 5 and claim 7, and FIG. 5 is an electronic diagram to which the printed circuit board is attached via the fixtures. The mold housing of the apparatus is shown, and the mold housing 23 is formed of a bottom portion 25 formed in a rectangular shape in plan view and a side surface provided around the bottom portion 25. Like the mold housing 5 of FIG. A plurality of slit-shaped air holes 21 are provided at equal pitches on the left and right side surfaces 27 and 29, and a receiving portion 13 for inserting the insertion side end portion 11 of the printed circuit board 1 is provided. There are no screw mounts or locking claws.

As shown in FIG. 1 to FIG. 4, the fixture 31 is formed on a fixture body 39 having a rectangular shape in plan view in which a slit 37 opens over two adjacent end surfaces 33 and 35, and an end surface 41 on the opposite end surface 35 side. And an elastic piece 43 extending from the end surface 33 along the end surface 41, and the elastic piece 43 extends along the end surface 41 in a direction of being gradually separated.
The slit 37 sandwiches the corner of the printed circuit board 1 and attaches the fixture 31 to the printed circuit board 1 detachably. The slit 37 is formed at the center of the end faces 33 and 35 as shown in FIGS. In addition, a slope 45 for guiding the printed circuit board 1 to be inserted into the slit 37 inward is formed at the substrate insertion opening of the slit 37, and the inner wall surfaces 47 and 49 of the slit 37 are printed as shown in FIG. The shape is orthogonal to the corner of the substrate 25.

A cylindrical boss 51 that engages with the screw hole 3 provided at the corner of the printed circuit board 1 protrudes in the slit 37, and the corner of the printed circuit board 1 is sandwiched in the slit 37. When the boss 51 is engaged with the screw hole 3, the corners of the printed circuit board 25 are brought into contact with the inner wall surfaces 47 and 49 of the slit, so that the fixing tool 31 is securely attached to the printed circuit board 1.
As shown in FIGS. 1 and 2, the boss 51 is also provided with a slope portion 53 on the substrate insertion port side of the slit 37 for guiding the printed circuit board 1 inserted into the slit 37 further inward.

  On the other hand, the elastic piece 43 is provided with a convex lock portion 55 that can be engaged with the air hole 21 of the mold housing 23 and protrudes outward, as shown in FIG. The fixing tool 31 is attached to the left and right corners of the part as described above, and the insertion side end 11 of the printed circuit board 1 is inserted into the receiving part 13 of the mold housing 23, and then the elastic force of the elastic piece 43 is used. When the lock portion 55 is engaged with the air holes 21 of the left and right side surfaces 27 and 29, the printed circuit board 1 is fixed to the mold housing 23.

And since the said fixing tool 31 can be used front and back without directionality, when attaching the fixing tool 31 to two right and left corners of the rear side edge part of the printed circuit board 1 as described above, one type of fixing tool is used. One of 31 may be reversed and attached to the printed circuit board 1.
Further, as shown in FIGS. 1 to 4, a front-end Z-shaped release lever 57 is provided at the tip of the elastic piece 41, and the printed circuit board 1 is fixed to the mold housing 23 via the fixture 31 as shown in FIG. 6. 1 and FIG. 6, when the release lever 57 is operated in the direction of the arrow against the elastic force of the elastic piece 41, the lock portion 55 is detached from the air hole 21, and the printed circuit board 1 is molded. It can be removed from the housing 23.

5 to 7, (a) and (c) are inner side views of the left and right side surfaces 27 and 29 of the mold casing 23, and (b) is a plan view of the bottom portion 25 of the mold casing 23. ing.
Since the present embodiment is configured as described above, in order to attach the printed circuit board 1 of FIG. 11 on which electronic components are mounted to the mold housing 23, first, as described above, first, in the slit 37 of the fixture 31. With the corners of the printed circuit board 1 being sandwiched, the bosses 51 are engaged with the screw holes 3 of the printed circuit board 1, and the fixtures 31 are attached to the left and right corners of the rear end of the printed circuit board 1 as shown in FIG. . At this time, since the inclined surfaces 45 and 53 guide the printed circuit board 1 inward, it is easy to insert the printed circuit board 1 into the slit 37.

  Thus, after attaching the fixtures 31 to the left and right corners of the rear end portion of the printed circuit board 1, the insertion side end portion 11 of the printed circuit board 1 is inserted into the receiving portion 13 of the mold housing 23. When the lock portion 55 is engaged with the air holes 21 on the left and right side surfaces 27 and 29 of the mold housing 23 using the elastic force of the elastic piece 43 of the fixture 31, the printed circuit board 1 is attached to the mold housing 23. It becomes.

And when removing the printed circuit board 1 attached to the mold housing 23 through the fixture 31 in this way, the release lever 57 is moved in the direction of the arrow against the elastic force of the elastic piece 41 as shown in FIG. What is necessary is just to operate, the lock part 55 can remove | deviate from the air hole 21, and the printed circuit board 1 can be removed from the mold housing | casing 23. FIG.
Further, when the circuit is changed to the printed board 1-1 whose size is shorter in the vertical direction as shown in FIG. 14 due to the addition of the circuit and cost reduction, the same procedure as shown in FIG. After attaching the fixtures 31 to the left and right corners of the rear end of the printed circuit board 1-1, the insertion side end 11 of the printed circuit board 1-1 is inserted into the receiving portion 13 of the mold housing 23 and fixed. If the lock portion 55 is engaged with the air holes 21 on the left and right side surfaces 27 and 29 of the mold housing 23 using the elastic force of the elastic piece 43 of the tool 31, the printed circuit board 1-1 having a different size from the printed circuit board 1 is used. Is attached to the mold housing 23.

  As described above, according to the present embodiment, by using the detachable fixing tool 31 in the air hole 21 of the mold housing 23, the printed boards 1 and 1-1 having different sizes can be uniformly placed on one mold housing 23. It can be fixed without changing the mold housing 23 even if the printed circuit board expands or contracts due to a sudden specification change, and the series products differ only in the size of the printed circuit board. The mold housing 23 can be used.

  Since the inclined portions 45 and 53 are provided in the board insertion port of the slit 37 of the fixture 31 and the boss 51, the fixture 31 can be easily attached to the printed boards 1 and 1-1 and the release lever 57 is provided. The fixing tool 31 can be easily detached from the mold housing 23 by the operation described above, and the printed circuit boards 1 and 1-1 can be attached to and detached from the mold housing 23 very easily.

  Further, since the inclined portion 45 is provided at the board insertion opening of the slit 37, the printed boards 1 and 1-1 can be easily removed, so that the recyclability is excellent. Since it can be attached to the left and right of the printed circuit boards 1, 1-1 by reversing the use, it is sufficient to prepare one type of fixing tool 31 without fixing the manufacturing cost of the fixing tool 31. It does not take time to manage the product of the tool 31.

  Furthermore, according to this embodiment, since the size of the printed circuit board can be changed for each pitch of the air holes 21 of the mold housing 23, the versatility of the mold housing 23 is high. In addition to being able to cope with the case where it is notched and fixed to the mold housing 23, it also serves as a pedestal that determines the height of the printed circuit board by adjusting the thickness of the fixture 31 (fixer body 39). Has many excellent advantages.

  FIGS. 8 to 11 show a resin-made fixing tool used for a printed circuit board mounting structure according to one embodiment of claims 1 to 3, 6, and 7, and the fixing tool 31 of this embodiment. -1 represents the inner wall surface 59 of the slit 37 of the fixture main body 39-1 with which the corners of the printed circuit board 1 come into contact instead of the inner wall surfaces 47 and 49, and has an inclined surface shape extending diagonally. As shown in FIG. 10, the corners of the printed circuit board 1 in contact with the inner wall surface 59 are chamfered to form an inclined surface 61.

Since other configurations are the same as those of the embodiment of FIGS. 1 to 7, the same components are denoted by the same reference numerals and description thereof is omitted.
Thus, according to the present embodiment, when the circuit is changed to the printed circuit board 1-2 having different sizes in the vertical and horizontal directions as compared with the printed circuit board 1 as shown in FIG. It is possible to cope with this by changing the mounting position of the fixing tool 31-1 with respect to the mold housing 23, and it is only necessary to chamfer the corner of the new printed circuit board 1-2 in contact with the inner wall surface 59 as the inclined surface 63. According to the present embodiment, the intended purpose can be achieved as in the embodiments of FIGS.

  In each of the above-described embodiments, the insertion side end 11 of the printed circuit boards 1, 1-1, 1-2 is inserted into the receiving part 13 of the mold housing 23, and the printed circuit boards 1, 1-1, 1-2 are inserted. It is an attachment structure that fixes the rear side end portion to the mold housing 23 using the fixtures 31 and 31-1, for example, by attaching four fixtures 31 to the four corners of the printed circuit board 1 and 1-1, The present invention can also be applied to an attachment structure for fixing the printed boards 1 and 1-1 to the mold housing 23.

It is a top view of the fixing tool used for the mounting structure of the printed circuit board which concerns on one Embodiment of Claim 1 thru | or Claim 5 and Claim 7. It is a side view of the fixing tool shown in FIG. It is a perspective view of the fixing tool shown in FIG. It is a perspective view of the fixing tool shown in FIG. It is the top view of the bottom part of a mold housing | casing, and the inner side view of both sides | surfaces. It is the top view of the bottom part of the mold housing | casing which attached the printed circuit board, and the inner side view of both sides. It is the top view of the bottom part of the mold housing | casing which attached the printed circuit board, and the inner side view of both sides. It is a top view of the fixture used for the mounting structure of the printed circuit board which concerns on one Embodiment of Claim 1 thru | or Claim 3, Claim 6, and Claim 7. It is a side view of the fixing tool shown in FIG. It is explanatory drawing of the attachment structure of the printed circuit board using the fixing tool of FIG. It is a top view of a printed circuit board. It is the top view of the bottom part of the conventional mold housing | casing, and the inner side view of both sides | surfaces. It is a top view of the bottom part of the mold housing | casing which attached the printed circuit board. It is a top view of the printed circuit board from which size differs. It is the top view of the bottom part of the other conventional mold housing | casing, and the inner side view of both side surfaces. It is a top view of the bottom part of the mold housing | casing which attached the printed circuit board.

Explanation of symbols

1, 1-1, 1-2 Printed circuit board 3 Screw hole 11 Insertion side end 13 Receiving part 21 Air hole 23 Mold housing 27, 29 Side surface 31, 31-1 Fixing tool 37 Slit 39, 39-1 Fixing tool main body 43 Elastic pieces 45, 53 Slope portions 47, 49, 59 Inner wall surface 51 Boss 55 Lock portion 57 Release levers 61, 63 Inclined surface

Claims (7)

In a printed circuit board mounting structure for mounting a printed circuit board to a mold housing of an electronic device in which a large number of air holes are formed on the side surface,
The printed circuit board is fixed to the mold housing via a fixture that is detachably attached to a corner of the printed circuit board and provided with an elastic piece having a lock portion that is detachably engaged with the air hole. Printed circuit board mounting structure.   The printed circuit board mounting structure according to claim 1, wherein a slit for sandwiching a corner of the printed circuit board is provided in the fixture.   The printed board mounting structure according to claim 2, wherein a slope portion that guides the printed board to be inserted into the slit inward is provided at the board insertion opening of the slit.   The printed board mounting structure according to claim 2 or 3, wherein a boss that engages with a screw hole provided at a corner of the printed board is provided in the slit.   The printed board mounting structure according to claim 4, wherein the boss is provided with a slope portion that guides the printed board inserted into the slit inward.   The inner wall surface of the slit with which the corner of the printed circuit board abuts is an inclined surface, and the corner of the printed circuit board is chamfered along the inclined surface. The printed circuit board mounting structure described in the paragraph. The printed board mounting structure according to any one of claims 1 to 6, wherein a release lever having a Z-shape in front view is provided at a tip of the elastic piece.

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