JP2933595B1 - Substrate fixture - Google Patents

Abstract

An object of the present invention is to save space, to easily attach / detach a printed circuit board, and to improve fixing reliability. SOLUTION: The board fixing device includes a base 2 fixed to a motherboard 31 and a lock piece 3 provided to be movable in a vertical direction in a housing hole 11 provided in the base 2. The base 2 has a flat portion 9 and the flat portion 9
The daughter board 35 is placed on top. The lock piece 3 is a member having a substantially U-shaped cross section, and a slide shaft 15 provided near the bent portion 6 is slidably supported by the base 2. On one free end side of the lock piece 3 is formed a claw portion 7 for holding the daughter board 35 between the flat portion 9 and the other free end side. A projection 8 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for holding and connecting a printed circuit board to a sheet metal or printed circuit boards at a constant interval in various electronic / electric devices, and is particularly suitable for fixing an end portion of the printed circuit board. The present invention relates to a substrate fixing device.

[0002]

2. Description of the Related Art In an electric / electronic device, a printed circuit board is fixed to another printed circuit board or a sheet metal such as a chassis and held in a housing.

Conventionally, there are guide rail systems, angle connector mounting systems, and stacking connector mounting systems as methods for mounting daughter boards on printed circuit boards, for example, on a motherboard via connectors.

In the guide rail system, as shown in FIG.
Guide rail 1 on motherboard 101 erected vertically
03, and the daughter board 102 is mounted vertically along the guide rail 103 on the board surface of the motherboard 101. Angle connector mounting method
As shown in FIG. 6, the daughter board 112 is slid in parallel with the mother board 111 and mounted using angle connectors 113 and 114. The stacking connector mounting method is adopted for small electronic devices such as mobile communication bodies, personal computers, and mobile terminals. As shown in FIG.
124, motherboard 121 and daughter board 1
This is a method of mounting the semiconductor device 22 so as to face the semiconductor device 22.

On the other hand, as a method of fixing a printed circuit board to a sheet metal such as a chassis, there are a screwing method, a snap-fit method, and a method of fixing with a fixing tool having a rotating claw portion.

As shown in FIG. 8, the screw fixing method is a method in which a printed circuit board 132 is fixed to a chassis 131 by screws 136. In order to secure a space required for the connectors 133 and 134, the printed circuit board 132 is fixed. A spacer 135 is interposed between the power supply and the chassis 131. In the snap fit method, as shown in FIG.
1 and a spacer 1 is provided between the printed circuit board 142 and the chassis 141 similarly to the screwing method.
45 is interposed.

[0007] As shown in Figs. 10 and 11, a method of fixing a fixing tool having a claw portion is as follows.
Is fixed to the chassis 151, and the printed circuit board 152 is fixed to the chassis 151 by the fixing tool 153. The fixing tool 153 includes a fixing part 155 fixed to the chassis 151 and a movable part 154 that is rotatably provided on the fixing part 155 and has a claw piece 157 formed at its tip to hold the printed board 152 together with the fixing part 155. And The movable portion 154 is formed with a protrusion 158 that engages with an elastic holding portion 156 provided on the fixed portion 155 when the movable portion 154 rises with respect to the fixed portion 155. Thereby, the movable part 154 is held by the fixed part 155, and the printed circuit board 152 is fixed between the fixed part 155 and the movable part 154.

[0008]

However, the above-mentioned conventional fixing method has the following problems.

In the guide rail system, the printed circuit boards are mounted vertically, and cannot be adopted unless a sufficient space is secured. In addition, in the angle connector mounting method, since one printed circuit board is slid and mounted, the space required for attachment and detachment becomes large,
Accordingly, the incidental structure must be large. Therefore, these guide rail systems and angle connector mounting systems have limitations in the current situation where electronic circuit boards are becoming smaller and higher in density in recent years.

[0010] The stacking connector mounting method does not cause the above-described problems, but since the connection of the connector is held by the contact pressure of the contact, the connection may be disconnected due to vibration or external force. Reliability is impaired. In order to make the reliability of the connection of the stacking connector later, if the screwing method and the snap-fitting method used for fixing the printed circuit board and the chassis are used together, the arrangement of the contacts of the stacking connector is approximately 1 mm or less. If the mounting positions of the boards are shifted, mechanical stress is applied to the contacts of the connector.

On the other hand, the screwing method and the snap-fitting method for fixing the printed circuit board and the sheet metal require forming a fixing hole in the printed circuit board.
This cannot be applied when there is no space for forming a hole in the printed circuit board. Further, in the screwing method, a tool such as a screwdriver is required for attaching and detaching the printed circuit board, which makes the operation cumbersome. Even in the snap-fitting method, the attaching / detaching operation is not as easy as the screwing method.
In particular, in the snap-fit method, when a printed circuit board is connected to a connector, the connector must be pulled out in parallel so as not to apply stress to the connector, and it is substantially difficult to attach and detach the connector.

The method of fixing with the fixture allows the holding and release of the printed circuit board only by rotating the movable part, so that the detachability is good. Since the direction in which the projections are removed is the same as the direction in which the printed circuit board is removed, if a force is applied in the direction in which the printed circuit board is removed, the projections come off from the elastic holding portion and the lock is released.

In order to solve the above-mentioned problems of the conventional fixing method, the present invention provides a board fixing device which can save space, can easily attach and detach a printed circuit board, and has high fixing reliability. The purpose is to:

[0014]

In order to achieve the above object, a substrate fixing device of the present invention is a substrate fixing device for holding and fixing a printed board on a plate material at a distance from the plate material. along the surface to be secured for mounting the end portion of the printed circuit board, the plate surface perpendicular direction of the plate material
A base member having a receiving hole formed in the inner wall surface and a shaft portion slidably fitted in the guide groove.
Is provided so as to extend along the guide groove in the accommodation hole.
Movably held I cross-section a substantially U-shape, or
And a fixing member that is elastically deformable, and has a free end facing the fixing member on one free end side of the fixing member.
As a result of the shifting , a claw portion for holding the end portion of the printed board between the base member and the base member is formed, and the other free end side of the fixing member holds the end portion of the printed board. In this state, a projection that engages with the base member is formed, and the claw portion and the projection are formed outward.

In the present invention configured as described above, the end of the printed circuit board is placed on the base member with the fixing member pulled up with respect to the base member, and then the fixing member is pushed toward the printed circuit board. As a result, the fixing member is engaged with and held by the base member, and the printed circuit board is sandwiched between the base member and the fixing member, and is held and fixed at an interval from the plate member.

At this time, the projection of the fixing member engages with the base member, and the fixing member and the base member are fixed. The fixing member has a substantially U-shaped cross section, and the claw portion is on one free end side. And the projection is formed on the other free end side, and since both are formed outwardly from each other,
When a force for removing the printed circuit board is applied to the claw portion, a force for further increasing the engagement force with the base member is applied to the projection.
As a result, in a state where the printed board is held by the base member and the fixing member, the engagement between the base member and the fixing member is not released even if a force for removing the printed board is applied to the printed board. . Further, when the projection of the fixing member engages with the base member, the projection is elastically deformed with the bent portion as a fulcrum. Therefore, when the projection of the fixing member is engaged with the base member, no play occurs between the claw portion and the printed board.

Further, as a structure for movably supporting the fixing member on the base member, an accommodation hole is formed in the base member for accommodating the fixing member and having guide grooves formed on both side walls along the moving direction of the fixing member. At the same time, on both sides of the fixing member,
With the configuration in which the shaft portion slidably fitted in the guide groove is provided, the movement of the fixing member is smoothly performed. In this case, since the guide groove is provided so as not to reach the opening surface of the accommodation hole, the end of the guide groove serves as a stopper of the shaft portion, and the fixing member is prevented from coming off from the base member. Further, in this case, since the shaft portion needs to be passed over both sides of the accommodation hole in order to incorporate the fixing member into the base member, the tip of the shaft portion is formed with an inclination so that the fixing member can be incorporated into the base member. Becomes easier. Further, the fixing member is configured to be held by the fixing member so as to be rotatable around the shaft at the position where the claw portion releases the holding of the printed board, so that the printed board is placed on the base member. In addition, it is possible to release the fixing member so as not to obstruct the placement of the printed circuit board by rotating the fixing member.

Further, by using the operation lever on the other free end side of the fixing member, when removing the printed board held and fixed, the operation lever is pushed into the one free end side to engage the projection. If it is removed and the fixing member is pulled up with respect to the base member as it is, the holding of the printed circuit board is easily released. Further, the base member has a flat portion parallel to the plate surface of the plate material, and by fixing the end portion of the printed circuit board on the flat portion, the fixing position of the base member to the plate material is shifted. Even so, the position of the printed circuit board can be adjusted in the in-plane direction of the plate material.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, and shows a state in which a daughter board mounted on a motherboard is fixed by a board fixing tool. FIG. 2 is similar to FIG.
FIG. 4 is an exploded perspective view of a main part of FIG.

The present embodiment is an example in which a daughter board 35 is mounted on a motherboard 31 via connectors 33 and 34.
Are fixed at two ends thereof by two board fixing devices 1 respectively.

The board fixture 1 has a substantially prismatic base 2 fixed to the motherboard 31 and a vertically movable (in a direction parallel to the mounting direction of the daughter board 35) movable on the base 2. The lock piece 3 is provided so as to be rotatable around an axis parallel to the end face 36. In the present embodiment, the base 2 and the lock piece 3 are formed of a plastic such as polyamide having appropriate elasticity and strength.

The lock piece 3 is a member having a substantially U-shaped cross section. When both free ends are defined as one end and the other end with reference to the U-shaped bent portion 6, the one end is attached to the motherboard 31. A claw 7 for holding an end of the mounted daughter board 35 is formed. The other end of the lock piece 3 is a lock release lever 14 for releasing engagement with the base 2 described later.
An outwardly extending locking projection 8 is formed at an intermediate portion of the first portion. Further, in the vicinity of the bottom of the bent portion 6, sliding shafts 15 are provided on both side surfaces of the lock piece 3, respectively.

On the other hand, the base 2 is fixed to the base board 31 by screws 37.
It has a flat portion 9 on which the end of the daughter board 35 is placed. The flat portion 9 is formed with a screw hole 10 into which a screw 37 inserted into the motherboard 31 from the back side of the motherboard 31 is screwed. An accommodation hole 11 for accommodating the lock piece 3 is formed outside the daughter board 35 placed on the flat portion 9.

Guide grooves 12 are formed on both inner side walls of the receiving hole 11 so that the sliding shaft 15 of the lock piece 3 is slidably fitted therein and guides the vertical movement of the lock piece 3 in the receiving hole 11. At the same time, a locking piece 13 with which the locking projection 8 of the lock piece 3 is engaged is formed on the inner wall of the housing hole 11. The guide groove 12 does not reach the upper end of the accommodation hole 11, and the upper end of the guide groove 12 serves as a stopper 16 for preventing the sliding shaft 15 of the lock piece 3 from coming out of the guide groove 12. . Thereby, the lock piece 3
Is prevented from being detached from the base 2 and the lock piece 3 being lost.

Further, when the sliding shaft 15 is located at the upper end portion of the guide groove 12, the base 2 can be rotated so that the lock piece 3 can be tilted outward around the sliding shaft 15. Has a recess 20 for the lock piece 3
Are formed. In addition, stopper pieces 19 are formed on both side ends of the lock piece 3 so as to abut on the outer wall of the base 2 in order to regulate the rotation angle. This allows
The lock piece 3 is vertically movable along the guide groove 12, and is rotatable at the upper end position of the guide groove 12 so as to fall outward with respect to the daughter board 35. In particular, since the slide shaft 15 of the lock piece 3 slides in the guide groove 12 of the base 2, the lock piece 3 can be smoothly moved and rotated in the vertical direction with respect to the base 2.

The lock piece 3 is attached to the base 2 by inserting the lock piece 3 from above the base 2 into the accommodation hole 11.
This is done by fitting it into At this time, the sliding shaft 15 of the lock piece 3 goes over the stopper 16 of the base 2.
As shown in FIG. 3, an inclined portion 15 a is provided at the distal end portion 5 such that the length of the sliding shaft 15 becomes shorter toward the lower side in the figure (in the inserting direction of the lock piece 3).

Next, a procedure for fixing the daughter board 35 to the motherboard 31 by the above-described board fixture 1 will be described with reference to FIG. Note that the motherboard 3
1, the substrate fixture 1 is fixed by screws 37.

First, as shown in FIG. 4A, the daughter board 35 is placed from above the motherboard 31 with the lock piece 3 folded down, and as shown in FIG. Daughter board 3 at 33
5 is connected, and the end of the daughter board 35 is placed on the flat portion 9 of the base 2. At this time, even if the mounting position of the board fixing tool 1 to the motherboard 31 is shifted, the daughter boat 35 within the range of the flat portion 9 of the base 2.
Can be adjusted, so that stress applied to the connectors 33 and 34 can be prevented. This stress prevention effect is particularly effective for stacking connectors in which the contact pitch is as narrow as about 0.5 mm.

Next, as shown in FIG. 4 (c), the lock piece 3 is rotated and raised with respect to the base 2, and as shown in FIG. 4 (d), the lock piece 3 is moved into the guide groove 12 of the base 2. Along the hole 11.

As a result, the lock release lever 14 is elastically deformed and bent inward with the bent portion 6 as a fulcrum.
As shown in FIG.
And the lock piece 3 is fixed to the base 2, and the claw 7 of the lock piece 3 sandwiches the end of the daughter board 35 with the flat portion 9 of the base 2.

The above-described steps correspond to the steps shown in FIG.
This is performed simultaneously for one substrate fixture 1. Thus, the daughter board 35 is held at the ends near the four corners and fixed to the motherboard 31 with a very simple operation. Since the daughter board 35 is fixed in parallel with the motherboard 31, space can be saved in the height direction. Further, the direction in which the daughter board 35 of the lock piece 3 is pressed against the flat portion 9 and the direction in which the lock piece 3 engages with the locking piece 13 of the base 2 are different from each other. The engagement between the connector 3 and the base 2 is not released, and the connection reliability of the connectors 33 and 34 is improved.

In particular, in this embodiment, the lock piece 3 is
It has a structure in which a claw portion 7 is provided on one end side and a locking projection 8 is provided on the other end side, so that when an upward force is applied to the claw portion 7 in the drawing, the locking projection 8 When the force is applied in the direction in which the engagement force with the locking piece 13 increases, the daughter board 35 cannot be pulled out because the engagement between the locking projection 8 and the locking piece 13 is not released even if the daughter board 35 is pulled out.

In general, a projection having an inclination between a fulcrum that is elastically deformed and a projection, such as a locking projection, has a different shape depending on the position of the projection when elastically deformed and the position of the projection when restored. However, in the present embodiment, the locking projection 8 is elastically deformed with the bent portion 6 as a fulcrum.
Since there is no inclination between the fulcrum that elastically deforms and the locking projection 8, a difference in height between the position where the locking projection 8 is elastically deformed and the position where the locking projection 8 is restored hardly occurs. As a result, no play occurs between the claw portion 7 and the daughter board 35 when the lock piece 3 is locked. As a result, the lifting of the daughter board 35 is prevented, and the connectors 33 and 34 are prevented.
Connection reliability is further improved.

The release of the fixation of the daughter board 35 is performed in a procedure reverse to the procedure described above. That is, first, the lock release lever 14 is tilted inward to release the engagement of the locking projection 8 with the locking piece 13, and in this state, the lock piece 3 is pulled up. Next, the lock piece 3 is rotated at the rising end position of the lock piece 3 to fall outward, and the daughter board 35 is pulled up. Thus, the work of removing the daughter board 35 can be easily performed.

In this embodiment, an example is shown in which the same board fixture 1 is used in all four places. However, when the thickness of the daughter board 35 to be fixed by the board fixture 1 is different, lock pieces having different heights are used. Are prepared, and an appropriate lock piece may be selected and used according to the thickness of the daughter board. In addition, the example in which the base 2 is fixed to the motherboard 31 with the screws 37 has been described, but instead of the screw holes 10, an elastic projection or the like such as an anchor is provided on the lower end surface of the base 2, and this elastic projection is May be fixed by a so-called snap-fit method, or may be fixed by other means.

In this embodiment, the structure in which the lock piece 3 rotates with respect to the base 2 has been described. However, in the present invention, the lock piece 3 does not necessarily need to have a structure capable of rotating. When is located at the rising end with respect to the base 2, the lock piece itself may be elastically deformed to create a space for placing the daughter board 35 on the base 2. However, in this case, the lock piece 3 needs to be made of a material that is more easily elastically deformed, and there is a concern that the lock piece 3 is likely to be disengaged from the base 2. For this purpose, it is preferable to adopt a structure in which the lock piece 3 is rotated as in the present embodiment.

Furthermore, in the present embodiment, the fixing of the printed circuit boards has been described as an example. However, the present invention can be applied to the case where the printed circuit boards are fixed to a chassis of an electronic device.

[0039]

As described above, according to the present invention, a base member fixed to a plate member and a substantially U-shaped fixing member provided to be movable with respect to the base member in a direction perpendicular to the plate surface of the plate member. The fixing member is formed by forming a claw portion for holding the printed circuit board on one free end side of the fixing member and forming a projection for engaging with the base member on the other free end. The printed circuit board can be fixed and released only by pushing it in or pulling it up. As a result, space can be saved in the height direction, and the printed circuit board can be easily fixed and released. In addition, since the direction of the force acting on the claw portion for detaching the printed circuit board is different from the direction of the force acting on the projection and disengaging the base member, even if the force for disengaging the printed circuit board is applied, the fixing member and the fixing member are disengaged. The engagement with the base member is not released, and the reliability of fixing the printed circuit board can be improved.

Further, as a structure for supporting the fixing member movably on the base member, a receiving hole is formed in the base member, and the guide member is provided on both side walls and a guide groove is provided along the moving direction of the fixing member. At the same time, on both sides of the fixing member,
With the configuration in which the shaft portion is slidably fitted in the guide groove, the movement of the fixing member can be performed smoothly. In this case, since the guide groove is provided so as not to reach the opening surface of the accommodation hole, the fixing member is prevented from coming off from the base member, and the fixing member can be prevented from being lost. Further, in this case, by forming a slope at the tip of the shaft portion, the fixing member can be easily incorporated into the base member. Further, the fixing member is configured to be held by the fixing member so as to be rotatable around the shaft portion at the position where the claw portion releases the holding of the printed board,
When the printed circuit board is placed on the base member, the fixing member can be easily released.

Further, by using the other free end side of the fixing member as the operation lever, the holding of the printed board can be easily released when the printed board held and fixed is removed. Further, the base member has a flat portion parallel to the plate surface of the plate material, and by fixing the end portion of the printed circuit board on the flat portion, the fixing position of the base member to the plate material is shifted. However, the position of the printed circuit board can be adjusted in the in-plane direction of the plate material. This is particularly effective when the printed circuit boards connected to each other by the stacking connector are fixed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and shows a state in which a daughter board mounted on a motherboard is fixed with a board fixing tool.

FIG. 2 is an exploded perspective view of a main part of FIG.

FIG. 3 is an enlarged front view of the vicinity of a sliding shaft of the substrate fixture shown in FIG.

FIG. 4 is a view for explaining a procedure for fixing a daughter board by the board fixing tool shown in FIG. 1;

FIG. 5 is a perspective view of a conventional method of fixing a printed circuit board using guide rails.

FIG. 6 is a perspective view of a conventional method of fixing a printed circuit board using an angle connector.

FIG. 7 is a perspective view of a conventional method of fixing a printed circuit board using a stacking connector.

FIG. 8 is a side view of a conventional method of fixing a printed circuit board with screws.

FIG. 9 is a side view of a conventional method of fixing a printed circuit board by snap fitting.

FIG. 10 is a perspective view of a conventional fixture for fixing a printed circuit board.

11 is a side view of a state in which the printed circuit board is fixed by the fixture shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Board fixing tool 2 Base 3 Lock piece 6 Bending part 7 Claw part 8 Engagement projection 9 Flat part 10 Screw hole 11 Housing hole 12 Guide groove 13 Locking piece 15 Sliding axis 16 Stopper 19 Stopper piece 20 Escape recess 31 Motherboard 33 , 34 Connector 35 Daughter board 37 Screw

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuo Katsuura 2-33 Nishihashimoto, Sagamihara City, Kanagawa Prefecture Inside the R & D Center (Nikko Industries Co., Ltd.) (72) Norio Matsumoto 2-23 Nishihashimoto, Sagamihara City, Kanagawa Prefecture No. 3 Inside the R & D center of Nichiko Industry Co., Ltd. (56) References JP-A-5-267869 (JP, A) JP-A-63-70600 (JP, A) (58) Fields investigated (Int. Cl. ⁶⁾ , DB name) H05K 7/14

Claims (6)

(57) [Claims] 1. A substrate fixture for holding and fixing the printed circuit board at a leaf material and spacing on plate, is fixed to the surface of the plate material mounting <br/> the end of the printed circuit board For placing , along a direction perpendicular to the plate surface of the plate material
A base member having a receiving hole formed in an inner wall surface with a guide groove, and a shaft portion slidably fitted in the guide groove are provided.
With the above, it is possible to move freely along the guide groove in the accommodation hole.
Held cross-section a substantially U-shaped and having a elastically deformable securing member, wherein one of the free end of the securing member, prior to the fixing member
The movement towards a serial fixing member, wherein with the claw portion for clamping is formed between the end portion of the printed circuit board and the base member, wherein the other free end of the fixing member, the printed circuit board A substrate fixing tool, wherein a projection is formed to engage with the base member in a state in which an end portion is sandwiched, and the claw portion and the projection are formed outward from each other. 2. The guide groove is provided on both sides of an inner wall of the housing hole.
Surface, and the shaft portion is a center of both sides of the fixing member.
The substrate fixing device according to claim 1, wherein the substrate fixing device is provided at a central bent portion.
Utensils. 3. The substrate fixture according to claim 1, wherein the guide groove is provided so as not to reach an opening surface of the accommodation hole. 4. The fixing member according to claim 1, wherein the claw portion is rotatably held around the shaft portion at a position where the claw portion releases the holding of the printed circuit board. Item 2. The substrate fixing device according to item 1. 5. The substrate fixing device according to claim 1, wherein the other free end side of the fixing member is an operation lever. 6. The board fixing device according to claim 1, wherein the board member is a printed board connected to the printed board by a stacking connector so as to face the printed board.