JP2006216682A - Cabinet of electric apparatus, printed circuit board fitting tool and fitting structure of printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve work efficiency of fixing of PCB 20 without increasing the number of components and cost. <P>SOLUTION: A PCB fitting tool fitting PCB 20 to a cabinet 14 of an electric apparatus has a seat 12, a projection 11 and a tip 13. The seat 12 has an engagement hole 16 in a position which is the nearest to an end of PCB 20 at the time of fitting PCB 20. The projection 11 has notches 15A to 15C which can be bent to a side of the engagement hole 16 in order from the nearest. The tip 13 and the projection 11 are made to pass through a fitting hole 21. PCB 20 is placed on the seat 12. The projection 11 is bent to an almost right angle in the notches 15A and 15B. A distance between the seat 12 and the notch 15A, and a distance between the notches 15B and 15C on an inner side of bend of the projection 11, are almost equal to thickness of PCB 20. A distance between the notches 15A and 15B on the inner side of bend of the projection 11 is almost equal to a distance from the fitting hole 21 to the nearest end of PCB 20, in a fitting state where the projection 11 is bent in the notch 15C and the tip 13 is inserted into the engagement hole 16 so as to engage them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a casing of an electric device, a printed circuit board mounting tool, and a printed circuit board mounting structure, and more particularly to an electric device that is common to different types of electric devices and suitable for mounting the printed circuit board to the casing. And a printed circuit board mounting structure.

  Conventionally, when a printed circuit board (hereinafter referred to as “PCB”) is attached to a casing of an electric device, it is attached using a screw such as a cross-recessed machine screw (JIS B1111).

  Patent Document 1 discloses a metal contact piece mounting structure that can securely attach a metal contact piece to a circuit board even when the space for soldering is narrow.

  Patent Document 2 discloses a printed circuit board fixing structure in which a printed circuit board is attached to and removed from a chassis without the need for a tool.

Patent Document 3 discloses a substrate fixing structure that does not require a complicated jig for holding the substrate at the temporary fixing position and does not require parts for holding the workpiece.
JP 2002-344171 A JP 2001-44664 A JP-A-7-297574

  However, when mounting with screws, there is a problem that the printed circuit board must be held in some way until the screws are tightened, and a tool is required to fasten the screws, which takes time. It was. There has been a problem that the mounting hole of the printed circuit board and the screw hole of the housing have to be aligned.

  In the technique disclosed in Patent Document 1, temporary fixing can be performed by attaching a printed circuit board to a metal contact piece. However, since it is necessary to fix by soldering, there is a problem that a tool is necessary and time is required.

  With the technique disclosed in Patent Document 2, a printed circuit board can be attached to the housing without the need for a tool. However, since it is necessary to manufacture a mounting piece having a complicated shape, there is a problem that costs are increased. In addition, it is necessary to prepare a special mounting portion for mounting the mounting piece on the housing side, and it is necessary to process a large square hole in the printed circuit board, resulting in a problem that costs increase.

  With the technique disclosed in Patent Document 3, the printed circuit board can be temporarily fixed. However, since it is necessary to fix with a screw, there existed a problem that a tool was required and it took time. In addition, a board holder, a screw for fixing the board holder and the printed circuit board, and a screw for fixing the board holder and the housing are required, and the number of parts increases and the number of screws increases. There was a problem that increased.

  The present invention has been made to solve the above-mentioned problems, and one of the objects of the present invention is to improve the work efficiency of fixing the printed circuit board without increasing the number of parts and the cost. A possible electrical device housing, printed circuit board fixture, and printed circuit board mounting structure are provided.

  In order to solve the above-described problem, according to one aspect of the present invention, a printed circuit board fixture that attaches a printed circuit board to a predetermined portion of a casing of an electric device includes a pedestal, a protrusion, and a tip. Have

  The base-like pedestal is fixed to a predetermined portion and holds the printed circuit board at a predetermined distance from the predetermined portion. Most of the columnar protrusions protrude from the pedestal portion on the opposite side to the predetermined portion, and can penetrate through the mounting holes of the printed circuit board. The tip portion is provided at the tip of the projection and can penetrate the mounting hole.

  The pedestal portion has through-holes or non-through-holes that engage with each other when the tip portion is inserted at a position that is closest to the end portion of the printed circuit board when the printed circuit board is attached. The protruding portion has a first portion, a second portion, and a third portion that can be bent toward the engagement hole, in order from the pedestal portion.

  The tip and the projection are passed through the mounting hole, the printed circuit board is seated on the pedestal, the projection is bent at a substantially right angle at the first portion and the second portion, and the projection is bent at the third portion. In the mounting state in which the tip portion is inserted into the engagement hole and engaged with the engagement hole, the distance from the base portion to the first portion and the second portion to The edge of the printed circuit board whose distance to the portion 3 is approximately equal to the thickness of the printed circuit board, and whose distance from the first portion to the second portion inside the projection bend is closest to the mounting hole Is roughly equal to the distance to

  Preferably, the protrusion is foldable by having a notch on the side of the engagement hole of each of the first portion, the second portion, and the third portion.

  Preferably, the protrusion is further bendable by having a notch on the opposite side of the engagement hole of each of the first portion, the second portion, and the third portion.

  Preferably, the pedestal portion holds the printed circuit board at a predetermined distance from the predetermined portion because the distance between the portion in contact with the printed circuit board and the predetermined portion is a predetermined distance.

  Preferably, the tip has a notch, and when the notch is compressed, it is elastically deformed to reduce the cross-sectional area of the tip. The tip of the tip can pass through the attachment hole and the engagement hole even if the notch is not compressed. The protrusion side of the tip can pass through the mounting hole when at least the notch is compressed, can penetrate the engagement hole when the notch is compressed, and the notch is compressed If not, the engagement hole cannot be penetrated.

  Preferably, in the attached state, the protrusion is elastically extended by the printed circuit board.

  Preferably, the pedestal portion has an engaging portion that engages with the predetermined portion at a portion in contact with the predetermined portion, and the pedestal portion is fixed to the predetermined portion by engaging the engagement portion with the predetermined portion. .

  According to another aspect of the present invention, the casing of the electric device includes a printed circuit board fixture in which the pedestal is fixed to a predetermined portion by integrally molding the printed circuit board fixture and the casing. Prepare.

  Preferably, the material of the printed circuit board fixture is polystyrene.

  According to still another aspect of the present invention, the printed circuit board mounting structure is a mounting structure in which a printed circuit board is mounted on a predetermined portion of a casing of an electric device with a printed circuit board mounting tool. The printed circuit board fixture has a pedestal, a protrusion, and a tip.

  The base-like pedestal is fixed to a predetermined portion and holds the printed circuit board at a predetermined distance from the predetermined portion. Most of the columnar protrusions protrude from the pedestal portion on the opposite side to the predetermined portion, and can penetrate through the mounting holes of the printed circuit board. The distal end portion is provided at the distal end of the projection portion and has a distal end portion that can penetrate the attachment hole.

  The pedestal portion has through-holes or non-through-holes that engage with each other when the tip portion is inserted at a position that is closest to the end portion of the printed circuit board when the printed circuit board is attached. The protruding portion has a first portion, a second portion, and a third portion that can be bent toward the engagement hole, in order from the pedestal portion.

  The tip and the projection are passed through the mounting hole, the printed circuit board is seated on the pedestal, the projection is bent at a substantially right angle at the first portion and the second portion, and the projection is bent at the third portion. In the mounting state in which the tip portion is inserted into the engagement hole and engaged with the engagement hole, the distance from the base portion to the first portion and the second portion to The printed circuit board has a distance from the first part to the second part inside the bent portion of the projection that is closest to the mounting hole and the mounting hole. Is approximately equal to the distance to the end of

  According to the present invention, the pedestal portion is fixed to a predetermined portion of the housing by the printed circuit board mounting tool, and the printed circuit board is held at a predetermined interval from the predetermined portion. Further, the front end portion and the protruding portion are passed through the mounting hole of the printed circuit board, the printed circuit board is seated on the pedestal portion, and the protruding portion is bent at a substantially right angle at the first portion and the second portion. The printed circuit board is attached by bending the protrusion at the portion and inserting the tip portion into the engagement hole to engage with the engagement hole.

  For this reason, a printed circuit board can be temporarily fixed because a front-end | tip part and a projection part are passed through the attachment hole of a printed circuit board. Further, when molded integrally with the housing, the number of components is reduced, and even when not molded integrally with the housing, the number of components does not increase.

  Further, the structure of the component is not particularly complicated, and the printed circuit board does not need to be particularly processed, so that the cost does not increase. Moreover, since the printed circuit board can be attached to the housing simply by bending the protrusion and inserting the tip portion into the engagement hole, the attachment operation can be simplified.

  As a result, it is possible to provide a printed circuit board mounting tool capable of improving the working efficiency of fixing the printed circuit board without increasing the number of parts and the cost.

  Further, the distance from the pedestal portion to the first portion and the distance from the second portion to the third portion inside the bent portion of the protruding portion are approximately equal to the thickness of the printed circuit board, and the protruding portion The distance from the first part to the second part inside the bend is approximately equal to the distance from the mounting hole to the end of the closest printed circuit board.

  As a result, the printed circuit board mounting tool can firmly fix the printed circuit board to the housing.

  In addition, the first portion, the second portion, and the third portion each have a notch on the side of the engagement hole, or further have a notch on the opposite side of the engagement hole. Thus, the protrusion can be bent. For this reason, it becomes easy to bend a protrusion part and a bending location also becomes clear.

  Further, the front end portion has a notch, and when the notch is compressed, it is elastically deformed to reduce the cross-sectional area of the front end. The tip of the tip can pass through the attachment hole and the engagement hole even if the notch is not compressed, and the protrusion side of the tip is at least the attachment hole when the notch is compressed. The projection portion side of the tip portion can be easily penetrated through the engagement hole when the notch portion is compressed, so that the tip portion can be easily inserted into the attachment hole and the engagement hole. Can be passed through. For this reason, work efficiency improves.

  In addition, the protrusion side of the tip part can be inserted into the engagement hole only when the cutout part is compressed, so that the cutout part is compressed and engaged with the engagement hole. As long as the notch is not compressed, the tip does not come out of the engaging portion. For this reason, the printed circuit board can be firmly fixed to the housing by the printed circuit board mounting tool.

  In addition, by fixing the printed circuit board to the housing with the printed circuit board mounting tool, the protrusion is elastically extended by the printed circuit board in the mounted state. be able to.

  Further, the pedestal portion has an engaging portion that engages with the predetermined portion at a portion in contact with the predetermined portion, and the pedestal portion is fixed to the predetermined portion by engaging the engaging portion with the predetermined portion. The For this reason, since a printed circuit board fixture and a housing | casing can be shape | molded separately, it becomes easy to produce.

  Further, the pedestal is fixed to the predetermined portion by integrally forming the printed circuit board fixture and the housing. For this reason, the number of parts can be reduced.

  Moreover, it can shape | mold easily by making the material of a printed circuit board fixture into polystyrene.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is an external view of a PCB mounting structure 10 according to an embodiment of the present invention.

  Referring to FIG. 1, a PCB mounting structure 10 is a structure for mounting a PCB to a predetermined portion of a housing 14 with a PCB mounting tool. The PCB fixture has a protruding portion 11, a pedestal portion 12, and a tip portion 13.

  The PCB fixture and the housing 14 are molded integrally. Thereby, the base 12 of the PCB fixture is fixed to a predetermined portion of the housing 14. The material of the PCB fixture and the housing 14 is preferably polystyrene. Thereby, the bendability of the PCB fixture and the strength of the housing 14 can be provided in a well-balanced manner. The materials of the PCB fixture and the housing 14 are not limited to this, and other resins may be used as long as the bendability of the PCB fixture and the strength of the housing 14 can be ensured.

  The pedestal portion 12 has a truncated cone shape. However, the pedestal portion 12 may be in the shape of a truncated pyramid, a cylinder, or a prism. Further, the pedestal portion 12 is solid. However, it is not limited to this, The base part 12 may be hollow. Further, the pedestal portion 12 may be a portion molded by recessing a part of the housing inward.

  The protrusion 11 protrudes from the pedestal 12 to the opposite side of the housing 14. The shape of the protrusion 11 is a columnar shape and includes notches 15A to 15C. Since the protruding portion 11 is penetrated through the PCB mounting hole, when the PCB mounting hole is a circular hole, the section of the protruding portion 11 without the cutout portions 15A to 15C, that is, the cross section of most of the protruding portion 11 The shape of is preferably a circle. However, the shape of the cross section of the protrusion 11 is not limited to this, and may be another shape, for example, a polygon.

  The depth of the notches 15A to 15C of the protrusion 11 is preferably a depth that allows the protrusion 11 to be easily bent and does not cause the protrusion 11 to break. Further, the notches 15A to 15C of the protrusion 11 are provided on the side of the engagement hole 16 of the pedestal 16 as shown in FIG.

  However, the present invention is not limited to this, and the notches 15 </ b> A to 15 </ b> C of the protrusion 11 may be provided on the side of the pedestal 16 on the side of the engagement hole 16 and on the opposite side. In particular, when the cross-sectional shape of the protrusion 11 is a circle, the notches 15A to 15C are provided from both sides in this way, even if the notch is deepened, the cross-sectional area of the protrusion 11 of this part is increased. Since it can enlarge, the bendability and intensity | strength of the projection part 11 can be ensured with sufficient balance.

  Moreover, the shape of the cross section of the notches 15A to 15C of the protrusion 11 is not limited to the trapezoidal shape as shown in FIG. 1, but is another shape, for example, an arcuate shape with respect to an acute sector or a semicircle. It may be. Since the stress concentration is prevented when the shape has as few corners as possible or the angle is as gentle as possible even if there are corners, the cross-sectional shape of the notches 15A to 15C is trapezoidal or circular rather than triangular. An arcuate shape is preferred.

  The tip portion 13 is provided at the tip of the protruding portion 11. The shape of the distal end portion 13 is a truncated cone shape. The diameter of the cross section on the distal end side of the distal end portion 13 is smaller than the diameter of the cross section on the protruding portion 11 side of the distal end portion 13. The tip portion 13 is provided with a notch from the tip side. The depth of the notch may extend to the protrusion 11. By compressing this notch, the tip portion 13 is elastically deformed, and the cross-sectional area of the tip portion 13 is reduced.

  Further, the pedestal portion 12 is provided with an engagement hole 16 with which the distal end portion 13 is engaged. As shown in FIG. 1, the engagement hole 16 is a non-through hole. However, the engagement hole 16 is not limited to this, and may be a through hole.

  FIG. 2 is a first cross-sectional view for illustrating the PCB mounting procedure in PCB mounting structure 10 according to the embodiment of the present invention.

  With reference to FIG. 2, the PCB 20 is seated on the pedestal portion 12 by passing the distal end portion 13 and the protruding portion 11 through the attachment hole 21. In this state, the PCB 20 is temporarily fixed to the housing 14 and the PCB fixture. And it is bent about 90 degrees by the notch 15A so that the protrusion part 11 may follow the upper surface of PCB20.

  The diameter of the cross section on the distal end side of the distal end portion 13 and the diameter of the protruding portion 11 are smaller than the diameter of the mounting hole 21 of the PCB 20. The diameter of the cross section of the tip portion 13 on the side of the protrusion 11 is set to be smaller than the diameter of the mounting hole 21 of the PCB 20 at least when the notch of the tip portion 13 is compressed.

  Thereby, the front-end | tip part 13 and the projection part 11 can be penetrated to the attachment hole 21 of PCB20.

  Note that the diameter of the cross section on the distal end side of the distal end portion 13 may be smaller than the diameter of the mounting hole 21 of the PCB 20 when the notch of the distal end portion 13 is compressed. Further, the diameter of the cross section of the tip portion 13 on the protruding portion 11 side may be smaller than the diameter of the mounting hole 21 of the PCB 20 even when the notch of the tip portion 13 is not compressed.

  FIG. 3 is a second cross sectional view for illustrating the PCB mounting procedure in PCB mounting structure 10 according to the embodiment of the present invention.

  Referring to FIG. 3, next, the protrusion 11 is bent by about 90 ° at the notch 15 </ b> B so as to be along the end face of the PCB 20. Further, the protrusion 11 is bent at the notch 15 </ b> C, and the tip 13 is inserted into the engagement hole 16.

  FIG. 4 is a third cross sectional view for illustrating the PCB mounting procedure in PCB mounting structure 10 according to the embodiment of the present invention.

  With reference to FIG. 4, the diameter of the cross section on the distal end side of the distal end portion 13 and the diameter of the protruding portion 11 are smaller than the diameter of the inlet portion of the engagement hole 16 of the pedestal portion 12.

  Further, the diameter of the distal end portion 13 on the protruding portion 11 side is larger than the diameter of the inlet portion of the engagement hole 16 of the pedestal portion 12 when the notch of the distal end portion 13 is not compressed, but the notch of the distal end portion 13 is. When compressed, the diameter becomes smaller than the diameter of the entrance portion of the engagement hole 16 of the base portion 12.

  The diameter of the tip 13 on the side of the protrusion 11 is smaller than the diameter of the part deeper than the entrance of the engagement hole 16 of the base 12. The diameter of the cross section of the tip 13 on the side of the protrusion 11 is larger than the diameter of the protrusion 11.

  Thereby, when the tip part 13 is inserted to the back part from the entrance part of the engagement hole 16 of the base part 12, the compression of the notch of the tip part 13 is released, and the protruding part 11 side of the tip part 13 is It cannot be removed from the entrance of the engagement hole 16 of the base 12. As a result, the tip end portion 13 of the PCB mounting tool is engaged with the engagement hole 16 of the pedestal portion 12.

  Further, the distance from the pedestal portion 12 to the notch portion 15A and the distance from the notch portion 15B to the notch portion 15C inside the bent portion of the protrusion 11 are substantially equal to the thickness of the PCB 20. The range substantially equal to the thickness of the PCB refers to the distance from the pedestal 12 to the notch 15A and the distance from the notch 15B to the notch 15C on the inner side of the bent portion 11 of the protrusion 11. This is the range of manufacturing tolerances when manufactured to have the same length as the thickness. Further, the distance from the notch 15A to the notch 15B inside the bent portion of the protrusion 11 is substantially equal to the distance from the mounting hole 21 of the PCB 20 to the end of the PCB 20 closest to the notch. The range substantially equal to the distance from the mounting hole 21 of the PCB 20 to the end of the closest PCB 20 is the distance from the notch 15A to the notch 15B on the inner side of the bent portion of the protrusion 11, and the mounting hole 21 of the PCB 20 It is a range of manufacturing tolerances when manufacturing so as to have the same length as the distance from the end of the PCB 20 to the end of the closest PCB 20.

  Accordingly, the PCB 20 can be firmly fixed to the housing 14 by the PCB mounting tool.

  In addition, since the protruding portion 11 of the PCB fixture fastens the PCB 20 and the protruding portion 11 is elastically extended, the PCB 20 is fixed by the tightening force due to the elastic force. It becomes possible to fix firmly without.

  In this embodiment, the case where the PCB fixture and the housing 14 are integrated has been described. However, the present invention is not limited to this, and the PCB fixture and the housing 14 may be separated. In this case, an engagement portion that engages with a predetermined portion of the housing 14 is provided at a portion of the base plate portion 12 of the PCB fixture that contacts the predetermined portion of the housing 14, and this engagement portion is provided at the predetermined portion of the housing 14. By being engaged, the pedestal portion 14 is fixed to a predetermined portion of the housing 14.

  Thereby, a PCB fixture and the housing | casing 14 can be shape | molded separately. For this reason, production becomes easy. Also, different materials can be used, such as a material having excellent bendability for the PCB fixture and a material having excellent strength for the housing 14.

  In this embodiment, the PCB mounting structure 10 has been described. However, the present invention is regarded as the invention of the housing 14 of the electric device having the PCB mounting structure 10 and the PCB mounting structure of the PCB mounting structure 10. be able to.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is an external view of a PCB mounting structure according to an embodiment of the present invention. FIG. It is a 1st sectional view for explaining a PCB attachment procedure in a PCB attachment structure according to an embodiment of the present invention. It is a 2nd sectional view for explaining the PCB attachment procedure in the PCB attachment structure according to the embodiment of the present invention. It is a 3rd sectional view for explaining the PCB attachment procedure in the PCB attachment structure according to the embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 PCB mounting structure, 11 Protrusion part, 12 Base part, 13 Tip part, 14 Housing | casing, 15A-15C Notch part, 16 Engagement hole, 20 PCB, 21 Mounting hole.

Claims (11)

A casing of an electric device provided with a printed circuit board fixture for attaching a printed circuit board to a predetermined portion of the casing of the electric device,
The material of the printed circuit board fixture is polystyrene,
The printed circuit board fixture is
By integrally molding the printed circuit board fixture and the housing, the fixed part is fixed to the predetermined part, and the distance between the part in contact with the printed circuit board and the predetermined part is a predetermined distance, A pedestal pedestal for holding the printed circuit board at a predetermined distance from the predetermined portion;
Projecting on the opposite side to the predetermined portion from the pedestal portion, penetrating through the mounting hole of the printed circuit board, most of the columnar protrusion,
Provided at the tip of the protrusion, and having a tip that can penetrate the mounting hole,
The pedestal has a penetrating or non-penetrating hole that engages with each other when the tip is inserted at a position that is generally closest to the end of the printed circuit board when the printed circuit board is attached. ,
The tip has a notch, and when the notch is compressed, it is elastically deformed to reduce the cross-sectional area of the tip,
The tip of the tip can pass through the attachment hole and the engagement hole even if the notch is not compressed,
The protrusion side of the tip can pass through the attachment hole when at least the notch is compressed, and can pass through the engagement hole when the notch is compressed. , When the notch is not compressed, the engagement hole is not able to penetrate,
The protrusion has a first part, a second part, and a third part that can be bent toward the engagement hole by having a notch on the engagement hole side. In order from the nearest
Passing the tip and the projection through the mounting hole, seating the printed circuit board on the pedestal, bending the projection at a substantially right angle at the first portion and the second portion, In the mounting state in which the protrusion is bent at the third portion and the tip portion is inserted into the engagement hole and engaged with the engagement hole, the pedestal portion is bent from the pedestal portion inside the protrusion. The distance between the first portion and the distance from the second portion to the third portion is approximately equal to the thickness of the printed circuit board, and the first portion is inside the bent portion of the protrusion. The distance from the second portion to the second portion is approximately equal to the distance between the mounting hole and the end of the printed circuit board closest to the mounting hole;
In the attached state, the protrusion is a state where the protrusion is elastically extended by the printed circuit board. A printed circuit board fixture for attaching a printed circuit board to a predetermined portion of a casing of an electric device,
A pedestal pedestal that is secured to the predetermined portion and holds the printed circuit board at a predetermined distance from the predetermined portion;
Projecting on the opposite side to the predetermined portion from the pedestal portion, penetrating through the mounting hole of the printed circuit board, most of the columnar protrusion,
Provided at the tip of the protrusion, and having a tip that can penetrate the mounting hole,
The pedestal has a penetrating or non-penetrating hole that engages with each other when the tip is inserted at a position that is generally closest to the end of the printed circuit board when the printed circuit board is attached. ,
The protrusion has a first part, a second part, and a third part that can be bent toward the engagement hole, in order from the base part,
Passing the tip and the projection through the mounting hole, seating the printed circuit board on the pedestal, bending the projection at a substantially right angle at the first portion and the second portion, In the mounting state in which the protrusion is bent at the third portion and the tip portion is inserted into the engagement hole and engaged with the engagement hole, the pedestal portion is bent from the pedestal portion inside the protrusion. The distance between the first part and the distance from the second part to the third part is substantially equal to the thickness of the printed circuit board, and the first part inside the projection bend A printed circuit board fixture, wherein the distance from the second portion to the second portion is approximately equal to the distance from the mounting hole to the end of the printed circuit board that is closest.   The said protrusion part can be bend | folded by having a notch in the side of the said engagement hole of each of the said 1st part, the said 2nd part, and the said 3rd part. Printed circuit board fixtures.   The said protrusion part is further bendable by having a notch on the opposite side of the said engagement hole of each of the said 1st part, the said 2nd part, and the said 3rd part. 4. The printed circuit board fixture according to 3.   3. The pedestal portion holds the printed circuit board at a predetermined distance from the predetermined portion when a distance between a portion in contact with the printed circuit board and the predetermined portion is the predetermined distance. Printed circuit board fixture. The tip has a notch, and when the notch is compressed, it is elastically deformed to reduce the cross-sectional area of the tip,
The tip of the tip can pass through the attachment hole and the engagement hole even if the notch is not compressed,
The protrusion side of the tip can pass through the attachment hole when at least the notch is compressed, and can pass through the engagement hole when the notch is compressed. The printed circuit board fixture according to claim 2, wherein when the cutout portion is not compressed, the engagement hole cannot penetrate the engagement hole.   The printed circuit board attachment according to claim 2, wherein in the attachment state, the protrusion is in a state of being elastically extended by the printed circuit board. The pedestal portion has an engaging portion that engages with the predetermined portion at a portion in contact with the predetermined portion,
The printed circuit board mounting tool according to claim 2, wherein the base part is fixed to the predetermined part by engaging the engagement part with the predetermined part.   The printed circuit board fixture according to claim 2, wherein the pedestal portion is fixed to the predetermined portion by integrally molding the printed circuit board fixture and the housing. Electrical device housing.   The printed circuit board fixture according to claim 2, or the casing of the electric device according to claim 9, wherein a material of the printed circuit board fixture is polystyrene. A printed circuit board mounting structure in which a printed circuit board is attached to a predetermined portion of a casing of an electric device with a printed circuit board mounting tool,
The printed circuit board fixture is
A pedestal pedestal that is secured to the predetermined portion and holds the printed circuit board at a predetermined distance from the predetermined portion;
Projecting on the opposite side to the predetermined portion from the pedestal portion, penetrating through the mounting hole of the printed circuit board, most of the columnar protrusion,
Provided at the tip of the protrusion, and has a tip that can penetrate the mounting hole,
The pedestal has a penetrating or non-penetrating hole that engages with each other when the tip is inserted at a position that is generally closest to the end of the printed circuit board when the printed circuit board is attached. ,
The protrusion has a first part, a second part, and a third part that can be bent toward the engagement hole, in order from the base part,
Passing the tip and the projection through the mounting hole, seating the printed circuit board on the pedestal, bending the projection at a substantially right angle at the first portion and the second portion, In the mounting state in which the protrusion is bent at the third portion and the distal end is inserted into the engagement hole and engaged with the engagement hole, the pedestal is bent from the pedestal portion inside the protrusion. The distance between the first part and the distance from the second part to the third part is substantially equal to the thickness of the printed circuit board, and the first part inside the projection bend A printed circuit board mounting structure, wherein the distance from the second portion to the second portion is substantially equal to the distance between the mounting hole and the end of the printed circuit board closest to the mounting hole.

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