JP2000114755A - Printed-circuit board fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printed-circuit board fixing device which can easily and reliably fix printed circuit boards having different heights through simple operations without substantially projection from an upper face (or front face) of a case. SOLUTION: A fixing device 20 includes a fixing plate 21 having at least one guide groove 24, and a depressing member 30 made of a resilient material one end of which is fixed to the fixing plate 21 and the other end of which is slidably mounted along the guide groove 24. The fixing device 20 is mounted in a case 1 on printed circuit boards 5, the other end of the depressing member 30 is slid along the guide groove 24, the depressing member 30 is bent downwards to be press contacted with the boards 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing a printed circuit board in an electronic apparatus, and more particularly to an apparatus for fixing a printed circuit board in a case where a pliton board having a different height is replaced and mounted on the electronic apparatus. is there.

[0002]

2. Description of the Related Art For example, in an electronic device such as a personal computer, as shown in FIG. 9, a printed circuit board 2 (hereinafter, referred to as a motherboard) on which electronic components are mounted is mounted on the bottom of a case 1 having an open top. A plurality of printed boards 5a, 5b, 5 such as a CPU board, an option board, etc.
c (hereinafter sometimes simply referred to as 5), and a terminal provided at the lower end thereof is connected to a connector 3 provided on the motherboard 2. Although the figure shows a case where the upper part of the case 1 is opened, the opening is usually located on the front surface in use.

An example of such a printed circuit board 5 is shown in FIG.
Shown in It should be noted that the electronic components mounted on the printed circuit board 5 are omitted in the figure. Reference numeral 6 denotes a terminal provided at the lower end of the printed circuit board 5, and 7 denotes a connector connected to a terminal (not shown) provided at a side end of the printed circuit board 5. The upper end of the connector 7 is bent at a right angle. The fixed metal fitting 8 is screwed. When mounting the printed board 5 on the motherboard 2, the terminals 6 are connected to the connectors 3 of the motherboard 2, and the lower ends of the fixing brackets 8 are inserted into holes (not shown) provided in the bottom plate of the case 1. The bent portion provided at the upper end is fixed to the flange provided at the upper end of the case 1 by screwing.

[0004] The printed circuit boards 5a to 5c as described above are:
Since it is only connected to the connector 3 provided on the motherboard 2 and the connector 7 attached to the fixing bracket 8 and attached to the case 1, the connectors 3 and 7 are not affected by vibration or impact.
Connection is easily loosened, which may result in poor connection. For this reason, it is desirable that the printed circuit boards 5a to 5c be pressed and fixed from above.

However, the printed circuit board 5 such as a CPU board and an option board is mounted on another commercially available board or the like as appropriate according to the purpose of use. The height is not constant and irregular. For this reason, it is troublesome to fix the upper ends of the plurality of printed boards 5a to 5c. Further, as described above, the printed circuit boards 5a to 5c need to have a structure in which the fixing means can be easily attached and detached in order to appropriately replace the printed circuit boards.

FIG. 11 is a perspective view of an essential part showing an example of a fixing device for a plurality of printed boards 5a to 5c in such a case. In the figure, reference numeral 10 denotes an L-shaped fixture, and a vertical piece thereof is provided with a screw insertion hole (not shown) corresponding to the position of each of the printed circuit boards 5a to 5c. 11a, 1
1b and 11c are bent at right angles at their lower ends so that the contact pieces 12
Are formed, and the fixing pieces 11a to 11c are brought into contact with the vertical pieces of the fixing tool 10 and the screws 14 inserted through the screw inserting holes into the elongated holes 13 are fixed. By screwing a nut (not shown) on the opposite side of the long piece, it can be moved up and down along the vertical piece and can be fixed at a desired position.

In the fixing device 9 configured as described above, the fixing tool 10 is mounted on the case 1 orthogonal to the printed circuit boards 5a to 5c, and both ends thereof are fixed to the case 1. Then, loosen the screw 14 to move the fixing pieces 11a to 11c up and down,
The contact pieces 12 are respectively brought into contact with the upper end portions of the printed boards 5a to 5c, and the screws 14 are tightened and fixed at the positions, and the printed boards 5a to 5c are pressed from above. The connection with is not loosened.

[0008]

According to the fixing device 9 described above, the printed circuit boards 5a to 5c are pressed from above, thereby preventing the connection of the connectors 3 and 7 from being loosened due to vibration or the like. Are printed circuit boards 5a to 5
Since the heights of the fixing pieces c are different, the lengths of the fixing pieces 11a to 11c protruding upward (or forward) from the fixing tool 10 are different. Particularly, when the printed circuit board (for example, 5c) is high, most of the fixing pieces are fixed. It protrudes from the tool 10.

For this reason, the upper surface (or the front surface) of the frame 1
It is difficult to attach the panel to the frame, and it is necessary to form the frame 1 large in accordance with the case where the fixing pieces 11a to 11c project most, or to form the panel in a box shape, which requires extra material. Not only that, an unnecessary space is formed, which increases the size of the electronic device and inevitably increases the cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to easily and reliably mount printed circuit boards having different heights with a simple operation without substantially protruding from the upper surface (or front surface) of a case. It is an object of the present invention to obtain a printed circuit board fixing device that can be fixed.

[0011]

According to the present invention, there is provided an apparatus for fixing a printed circuit board, comprising: a fixing plate having at least one guide groove; an elastic member having one end fixed to the fixing plate and the other end fixed to the guide groove. A fixing device comprising a pressing member slidably mounted along the fixing board, the fixing device is mounted on a case on the printed circuit board, and the other end of the pressing member is slid along the guide groove, The pressing member is bent downward so as to be pressed against the printed circuit board.

The holding member is provided at one end of a strip-shaped elastic member with a locking portion for locking to a fixing plate, and at the other end has a hole into which a screw is screwed or inserted, and a guide groove on the upper surface. A fixing portion having a guide projection into which the fixing portion is fitted is provided, and a thin bent portion is provided substantially at the center in the longitudinal direction and at the center of the locking portion and the fixing portion.

The fixing portion of the holding member is slid along the guide groove, and the holding member is fixed to the fixing plate by a screw and a nut screwed or inserted into a hole provided in the fixing portion at a desired position. I did it.

At least a part of both sides in the longitudinal direction of the guide groove is formed in a corrugated shape, and a projection having a large diameter portion and a small diameter portion is provided on the upper surface of the fixing portion of the pressing member.

In addition, a corrugated portion is formed on at least a part of both edges in the longitudinal direction of the guide groove, and a large diameter slightly smaller than the wide portion of the corrugated portion is formed on the upper surface of the other end of the pressing member. Part, a small diameter part slightly smaller in diameter than the narrow part of the corrugated part,
And an operation unit having a larger diameter head than the wide part of the corrugated part.

[0016]

[First Embodiment] FIG. 1 is a schematic perspective view of a first embodiment of the present invention. The same parts as those in the conventional example described with reference to FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the drawing, reference numeral 20 denotes printed circuit boards 5a to 5
This is a fixing device for the printed circuit boards 5a to 5c attached to the opening of the case 1 at right angles to c, and details thereof are shown in FIGS.

In FIG. 2, reference numeral 21 denotes a substantially rectangular fixing plate made of a metal plate, a synthetic resin plate, or the like. Locking pieces 22a and 22b are protruded from one end of the fixing plate, and the other end facing the fixing plate is provided. Fixed arms 23a and 23b are provided at the edges. 2
4a, 24b, 24c, 24d, 24e, 24f (hereinafter may be simply referred to as 24) are provided on printed circuit boards 5a to 5c mounted on the motherboard 2 (accordingly, on the connector 3 provided on the motherboard 2). Guide grooves, 25a, 25b, 25c, 25d, 25e, 25f
(Hereinafter sometimes simply referred to as 25) is a guide groove 24a.
Locking piece 22a and mounting arm 2
This is a locking hole provided near an edge perpendicular to 3a. In addition, 26a, 26b, 26c, 26d are guide grooves 24a-
Although the ventilation hole is provided between 24f, it may be omitted.

Reference numeral 30 denotes a pressing member, as shown in FIG. 3, made of an elastic material such as a synthetic resin, and has a width W ₂ of
Is formed in a band shape wider than the width W ₁ , and near the center and both ends, a thin bent portion 3 whose lower surface is cut off
1a, 31b and 31c are formed, and a bent portion 3 at the center is formed.
1b is formed in an arc shape toward the lower side.

[0019] 32 is a fixed part of the thick provided on one end, a narrow guide protrusion 33a on the upper surface is a width W ₃ than the width W ₁ of the guide grooves 24, 33b are projected, both A screw hole 34 in which a nut is inserted is provided between the guide projections 33a and 33b. The screw hole 34 may be a screw insertion hole. Further, the other end is formed to be thick, and a locking claw 35 is provided on the upper surface.
On the upper surface on the central portion side of the locking piece 3, a locking piece 3 opened to the locking claw 35 side.
6 are provided. Note that a thick portion is formed between the bent portions 31a and 31b and between the bent portions 31b and 31c.

Next, the holding member 30 constructed as described above is used.
A description will be given of the attachment to the fixing plate 21 with reference to FIG. First, the locking piece 36 of the pressing member 30 is inserted into the locking hole 25 of the fixing plate 21 to lock, and the locking claw 35 is locked to the edge of the fixing plate 21. Next, the pressing member 30 is brought into contact with the lower surface of the guide groove 24 of the fixing plate 21 to make the guide projection 33
a, 33 b are inserted into the guide grooves 24. Then, the screw 41 inserted into the guide groove 24 of the fixing plate 21 is screwed into the screw hole 34 provided in the fixing portion 32 of the holding member 30 and screwed into the nut 42 abutting on the lower surface of the fixing portion 32. Then screw 41
When the fixing member 21 is tightened, the holding member 30 is
Attached to the underside of the

In this manner, the guide grooves 24a to 24 provided in the fixed plate 21 corresponding to the printed boards 5a to 5c are provided.
The fixing device 20 is configured by attaching the pressing members 30 to f, respectively, and the fixing device 20 is placed on the opening of the case 1 at right angles to the printed circuit boards 5a to 5c as shown in FIG. The locking pieces 22a, 22b are fitted into the locking holes 1a, 1b provided in the case 1, and the mounting arms 23a, 23b
Is fixed to a mounting portion (not shown) provided in the case 1 by screwing. At this time, each holding member 30 is located on each of the printed boards 5a to 5c. The means for attaching the fixing device 20 to the case 1 is not limited to the above, and an appropriate means can be used.

Next, the operation of the present embodiment as described above will be described with reference to FIG. First, the screw 41 is loosened to hold the holding member 30 slidably along the guide groove 24 of the fixing plate 21. Next, depending on the height of the printed circuit board 5 mounted on the motherboard 2, the fixing portion 32 of the pressing member 30 is fixed.
Move along the guide groove 24. The pressing member 30 is bent with the bent portions 31a to 31c as fulcrums along with the movement of the fixed portion 32, and a bent portion 31b provided substantially in the center thereof.
Contacts the upper end of the printed circuit board 5.

In this state, when the screw 41 is tightened to fix the fixing portion 32 at that position, the pressing member 30 is elastically deformed into a substantially triangular shape with the central bent portion 31b as the apex, and It is pressed by the elastic force and fixes the printed circuit board 5 at that position.

According to the present embodiment configured as described above, the upper ends of the plurality of printed boards 5a to 5c having different heights mounted on the motherboard 2 are each elastically pressed by the pressing member 30. Accordingly, the printed circuit boards 5a to 5c can be securely fixed at predetermined positions by a simple structure and a simple operation, and are not loosened by vibration or the like.

Further, since the flat fixing device 20 including the fixing plate 21 and the pressing member 30 is mounted on substantially the same plane as the upper end surface (front end surface) of the case 1, the case 1 and the panel need to be enlarged. Therefore, the size of the electronic apparatus can be reduced, and waste of materials can be eliminated.

[Second Embodiment] FIG. 6 is a plan view and a longitudinal sectional view of a main part of a second embodiment of the present invention. In the present embodiment, a corrugated portion 27 composed of a wide portion and a narrow portion is provided on the entire length or the rear side (left side in the figure) of both edges in the longitudinal direction of the guide groove 24 provided in the fixing plate 21 and a presser foot is provided. A protrusion 37 is provided at the center of the screw hole 34 on the upper surface of the holding portion 32 of the member 30. The lower part of the protrusion 37 is slightly smaller than the diameter of the wide portion of the corrugated portion 27 of the guide groove 24. The large diameter portion and the small diameter portion whose upper portion is slightly smaller than the narrow portion of the corrugated portion 27 are formed in two steps.

In the present embodiment as described above, in the initial state where the pressing member 30 is extended and fixed with the screw 41, the large diameter portion of the projection 37 is located within the wide portion of the corrugated portion 27 of the guide groove 24. are doing. Therefore, even if the screw 41 is loosened and the fixing portion 32 of the holding member 30 is slid, the large-diameter portion of the projection 37 is blocked by the narrow portion of the corrugated portion 27 and cannot move.

When the fixing portion 32 of the holding member 30 is to be slid in the direction of the arrow a in order to fix the printed circuit board 5, the screw 41 is loosened and pressed down, and the projection 37 is lowered. The small diameter portion is located inside the corrugated portion 27. As a result, the fixing portion 32 of the holding member 30 slides along the guide groove 24 in the direction of the arrow a, and when the screw 41 is stopped from being lowered at a predetermined position, the protrusion 37 rises and its large diameter portion is reduced. It fits into the wide part of the corrugated part 27 and is held at that position. When the screw 41 is tightened in this state, the pressing member 30 is elastically deformed into a substantially triangular shape as described with reference to FIG. 5, and the bent portion 31 which is the apex thereof is pressed against the printed circuit board 5.

To return the holding member 30 to its original state, the screw 41 is loosened and pressed down, so that the large-diameter portion of the projection 37 is disengaged from the corrugated portion 27 of the guide groove 24 and the small-diameter portion is inserted into the corrugated portion 27. Since it is located, the holding member 30 is automatically extended by its restoring force and returns to the original state.

According to the present embodiment, when the fixing portion 32 of the holding member 30 is fixed at a desired position, the large-diameter portion of the projection 37 becomes the wide portion of the corrugated portion 27 by stopping the screw 41 from being lowered. Since it is fitted and held at that position, the screw 41 can be easily tightened. To return to the original state, use screw 4
When the pressure member 1 is loosened and lowered, the pressing member 30 is automatically extended and returns to the original position, so that the operation is extremely easy.

[Third Embodiment] FIG. 7 is a plan view and a longitudinal sectional view of a main part of a third embodiment of the present invention. In the present embodiment, the protrusion 37 and the screw 41 of the second embodiment (FIG. 6) are used.
Instead of the nut 42, a large-diameter portion 44 having a diameter slightly smaller than the wide portion of the corrugated portion 27 and a small-diameter portion having a diameter slightly smaller than the narrow portion are provided on the upper surface of the fixing portion 32 of the holding member 30. 45
And an operation unit 4 comprising a head 46 larger than the diameter of the wide part
3 is provided.

In the present embodiment as described above, in the initial state in which the holding member 30 is extended, the large diameter portion of the operating portion 43 is pushed up by the elasticity of the holding member 30 so that the guide groove 2 is raised.
4 is located in the wide portion of the waveform portion 27. Therefore, even if the fixing portion 32 of the holding member 30 is slid, the large diameter portion of the operation portion 43 is blocked by the narrow portion of the corrugated portion 27 and cannot move.

When the fixing portion 32 of the holding member 30 is to be slid in the direction of the arrow a in order to fix the printed circuit board 5, as shown in FIG. The small diameter portion is located inside the corrugated portion 27. As a result, the fixing portion 32 of the holding member 30 slides in the direction of the arrow a along the guide groove 24, and the holding member 30 is elastically deformed into a substantially triangular shape as shown in FIG. It is pressed against the printed circuit board 5. When the user releases his / her finger from the operation unit 43 in a state where the bent portion 31b is strongly pressed against the printed circuit board 5, the operation unit 43 rises by the reaction force of the pressing member 30, and the operation unit 43
The large diameter portion 44 is fitted into the wide portion of the guide groove 24 and locked at that position.

In order to return the holding member 30 to the original state, if the operating portion 43 is depressed, the large diameter portion 44 of the operating portion 43 is disengaged from the corrugated portion 27 of the guide groove 24 and the lock is released, and the small diameter portion 45 is released. Is located in the corrugated portion 27, so that the pressing member 30 is automatically extended by the restoring force and returns to the original state.

According to the present embodiment, when the fixing portion 32 of the holding member 30 is fixed at a desired position, the large diameter portion 44 is fitted into the wide portion of the corrugated portion 27 by stopping the operation portion 43 from being reduced. When the operating portion 43 is pressed down, the pressing member 30 is automatically extended and returned to the original position when the operating portion 43 is pressed down. Release is possible and operation is extremely easy.

In the above description, the substantially rectangular fixed plate 21
A plurality of guide grooves 24 are provided on the guide groove 24, and the holding member 30 is attached to the guide groove 24 to form the fixing device 20. However, the shape of the fixing plate 21 can be appropriately changed. The number of the pressing members 30 may be one, and the number of the pressing members 30 can be appropriately increased or decreased in accordance with the printed circuit board 5 to be fixed. Also, the electronic device to which the printed board fixing device according to the present invention is mounted is not limited to the illustrated one, and any electronic device using printed boards having different heights may use the fixing device according to the present invention. be able to.

[0037]

According to the present invention, there is provided an apparatus for fixing a printed circuit board, comprising: a fixing plate having at least one guide groove; an elastic material having one end fixed to the fixing plate and the other end slidable along the guide groove. The fixing device is mounted on a case on a printed circuit board, the other end of the pressing member is slid along the guide groove, and the pressing member is bent downward. To press the printed circuit boards of different heights mounted on the motherboard elastically with the holding member, so that the printed circuit boards can be securely fixed by a simple structure and simple operation. Yes, it does not loosen due to vibration.

Further, since the flat fixing device including the fixing plate and the holding member is mounted on substantially the same plane as the upper end surface (or the front end surface) of the case, it is not necessary to make the case or panel large, and the The device can be miniaturized and material can be wasted.

The holding member is provided at one end of a band-shaped elastic member with a locking portion for locking to a fixing plate, and has a hole at the other end into which a screw is screwed or inserted, and is fitted into a guide groove on the upper surface. A fixed portion having a guide projection is provided, and a thin bent portion is provided substantially at the center of the longitudinal direction and at the center of the locking portion and the fixed portion. Can be fixed.

The fixing portion of the holding member is slid along the guide groove, and the holding member is fixed to the fixing plate by a screw and a nut screwed or inserted into a hole provided in the fixing portion at a desired position. Therefore, the printed circuit board can be securely fixed.

Since at least a part of both edges in the longitudinal direction of the guide groove is formed in a waveform, and a projection having a large diameter portion and a small diameter portion is provided on the upper surface of the fixing portion of the holding member, the holding member is provided. Is easier to fix and restore.

A corrugated portion is formed on at least a part of both longitudinal edges of the guide groove, and a large-diameter portion having a diameter slightly smaller than the wide portion of the corrugated portion is formed on the upper surface of the other end of the pressing member. Since the operation part consisting of a small diameter part slightly smaller in diameter than the narrow part of the part and a head part larger in diameter than the wide part of the corrugated part is provided,
The operation of fixing the printed circuit board is extremely easy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of Embodiment 1 of the present invention.

FIG. 2 is a perspective view of the fixing device of FIG. 1;

FIG. 3 is a plan view, a side view, and a bottom view of the pressing member of FIG. 2;

4A and 4B are a plan view and a side view showing a state in which a pressing member is attached to the fixing plate of FIG. 2;

FIG. 5 is an operation explanatory view of the fixing device of FIG. 1;

FIG. 6 is a plan view and a longitudinal sectional view of a main part according to a second embodiment of the present invention.

FIG. 7 is a plan view and a longitudinal sectional view of a third embodiment of the present invention.

FIG. 8 is an operation explanatory view of the third embodiment.

FIG. 9 is a schematic perspective view of an example of a conventional electronic device.

FIG. 10 is a perspective view of the printed circuit board of FIG. 9;

FIG. 11 is a perspective view of an example of a conventional printed circuit board fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Motherboard 3,7 Connector 5a-5c Printed circuit board 6 Terminal 8 Fixing fixture 20 Fixing device 21 Fixing plate 24a-24f Guide groove 25a-25f Locking hole 27 Wave part 30 Holding member 31a-31c Bending part 32 Fixing part 33a, 33b Guide projection 35 Locking claw 36 Locking piece 37 Protrusion 43 Operating section

Claims (5)

[Claims] 1. An electronic device in which printed boards having different heights are replaced and used, a fixed plate having at least one guide groove, and one end fixed to the fixed plate and made of an elastic material, and the other end is connected to the guide groove. A fixing device comprising a pressing member slidably mounted along the fixing board, the fixing device is mounted on a case on the printed circuit board, and the other end of the pressing member is slid along the guide groove, A fixing device for a printed circuit board, wherein the holding member is bent downward and pressed against the printed circuit board. 2. A holding member for locking the holding member to a fixing plate at one end of a band-shaped elastic material, and a hole at the other end into which a screw is screwed or inserted is inserted into a guide groove on an upper surface. 2. A fixing portion having a guide projection provided, and a thin bent portion is provided at a substantially central portion in a longitudinal direction and at a central portion side of the locking portion and the fixing portion. PCB fixing device. 3. A fixing portion of the holding member is slid along the guide groove, and the holding member is fixed to the fixing plate by a screw and a nut screwed or inserted into a hole provided in the fixing portion at a desired position. The printed circuit board fixing device according to claim 1, wherein the fixing is performed. 4. The guide groove is characterized in that at least a part of both edges in the longitudinal direction of the guide groove are formed in a waveform, and a projection having a large diameter portion and a small diameter portion is provided on an upper surface of a fixing portion of the pressing member. The printed circuit board fixing device according to claim 1. 5. A large diameter portion having a diameter slightly smaller than a wide portion of the corrugated portion, the corrugated portion being formed on at least a part of both edges in the longitudinal direction of the guide groove, and being provided on an upper surface of the other end of the pressing member. 2. The printed circuit board fixing device according to claim 1, further comprising an operation unit including a small-diameter portion having a diameter slightly smaller than the narrow portion of the corrugated portion and a head having a larger diameter than the wide portion of the corrugated portion.