JPH09298375A - System for preventing improper insertion of printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for preventing improper insertion of printed wiring boards which is simple and low-cost and minimizes the reduction of the pattern wiring area on the printed wiring board and the unusable area on the back panel. SOLUTION: A system comprises a shelf 2 provided with a top board 13 on which a back panel 4 for interconnection of multiple printed wiring boards 5a and 5b and guide rails 7 for guiding the printed wiring boards 5a and 5b are formed, and with a bottom board 14 and of the printed wiring boards 5a and 5b which are mounted on the shelf 2. A part 11 for preventing improper insertion of the printed wiring board 5a to be inserted into a connector 6 for a power supply circuit on the back panel 4 is provided on at least either the top board 13 or the bottom board 14. A notch 10 which is not in contact with the part 11 for preventing improper insertion is formed on the printed wiring board 5a on which the power supply circuit is mounted. The notch 10 is not formed on the printed wiring board 5b for other signal processing circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is supplied from a back panel in an electronic device constituted by mounting a plurality of printed wiring boards on a shelf having a back panel for interconnecting these printed wiring boards. The present invention relates to an erroneous insertion prevention structure for a printed wiring board that prevents a printed wiring board having a general signal processing circuit from being erroneously inserted into a power supply terminal portion.

[0002]

2. Description of the Related Art Generally, an electronic device constructed by mounting a plurality of printed wiring boards on a shelf having a back panel for interconnecting the printed wiring boards is disclosed in Japanese Patent Laid-Open No. 62-159497. As shown, an erroneous insertion prevention structure for the printed wiring board is provided for the purpose of preventing erroneous insertion in order to prevent erroneous operation and destruction due to incorrect insertion position.

An example of a conventional structure for preventing erroneous insertion of a printed wiring board is shown in FIGS. 8 (a), 8 (b) and 9. FIG. FIG.
(A), (b) is a top view of the printed wiring board used for the incorrect insertion prevention structure of a printed wiring board, and FIG. 9 is a perspective view of the back panel used for the incorrect insertion prevention structure of a printed wiring board. In FIGS. 8A and 8B, rectangular notches 103 are formed at corners on both sides in the width direction of the insertion-side ends of the printed wiring boards 101 and 102. The notch 103 is formed in each of the printed wiring boards 101 and 102 at the corner portion and in each of the printed wiring boards 101 and 102.
It is formed by changing the dimension in the substrate width direction. Further, the printed wiring board 101 has a notch 103 formed only on one side in the width direction. Incidentally, 109 is a connector connecting portion.

In FIG. 9, the back panel 104 includes
Erroneous insertion prevention blocks 106 and 107 are provided so as to sandwich the connectors 105a, 105b and 105c therebetween. The erroneous insertion prevention blocks 106 and 107 are provided with gaps 108 between the connectors 105a, 105b and 105c for the respective connectors 105a, 105b and 105c so that the notches 103 of the printed wiring boards 101 and 102 are fitted therein.
It is configured by changing the dimensions of.

In such a structure for preventing the incorrect insertion of the printed wiring board, the printed wiring board 1 is attached to the connector 105a.
When inserting 02, the block 107 side does not hit, but the block 106 side hits, and the connector connecting portion 109 of the printed wiring board 102 is connected to the connector 105.
Cannot be inserted into a. When the printed wiring board 101 is inserted into the connector 105a with the upper side in the drawing as the block 106 side, there is no problem on the block 107 side, but the block 106 side hits the printed wiring board 101 and cannot be inserted. On the other hand, when trying to insert the lower side in the figure as the block 106 side, the printed wiring board 101 can be inserted into the connector 105a without hitting any of the blocks 106 and 107, whereby the printed wiring board is inserted into the correct position. be able to.

[0006]

However, the above-mentioned conventional structure for preventing erroneous insertion of the printed wiring board has various problems. The first problem is that the manufacturing cost is high because the block has a complicated step-like shape. The second problem is that the pattern wiring area of the printed wiring board is reduced. That is, since the block is used as an obstacle for preventing erroneous insertion, it is necessary to determine the size of the cutout of the printed wiring board according to the size of the block, which naturally results in a large cutout. This reduction in the pattern wiring area is a major pain in designing the pattern because the connector for connection to the back panel tends to have a large number of pins in the recent trend of higher density. A third problem is that since the block is mounted on the back panel, its area is large and the unusable area is large on the back panel.

The present invention has been made in view of the above problems, and an object thereof is to provide a simple and low-cost structure for preventing erroneous insertion of a printed wiring board. Another object of the present invention is to provide an erroneous insertion prevention structure for a printed wiring board in which the pattern wiring area of the printed wiring board is less reduced and the unusable area of the back panel is minimized.

[0008]

In order to achieve the above object, the structure for preventing the incorrect insertion of a printed wiring board according to the present invention comprises a back panel for interconnecting a plurality of printed wiring boards,
A shelf having an upper surface plate and a lower surface plate on which guide rails for guiding the printed wiring board are formed, and a printed wiring board mounted on the shelf. At least one of the upper surface plate and the lower surface plate is a power source for the back panel. An erroneous insertion prevention part that interferes with the insertion of the printed wiring board to be inserted into the connector for the circuit is provided, and a notch is formed in the printed wiring board on which the power supply circuit is mounted so as not to abut the erroneous insertion prevention part, Notches are not formed in the printed wiring board of the other signal processing circuits.

Also, preferably, the erroneous insertion prevention portion is
The plate member is fixed to the upper surface plate or the lower surface plate, or the upper surface plate or the lower surface plate is cut and bent, or the upper surface plate or the lower surface plate is drawn.

According to the erroneous insertion prevention structure for a printed wiring board of the present invention having the above-mentioned structure, the erroneous insertion prevention portion prevents the insertion of the printed wiring board in which the notch is not formed, and the printed circuit on which the power circuit is mounted. A printed wiring board other than the wiring board is prevented from being connected to the power supply connector.

In the printed wiring board on which the power supply circuit is mounted, the notch avoids the erroneous insertion prevention portion, and the printed wiring board can directly enter and be inserted into the connector. Since the position of the notch is a portion sandwiched by the groove of the guide rail, it is a region where component mounting and pattern wiring are not possible, and the pattern wiring area is not reduced. Since the erroneous insertion prevention unit is provided on the upper surface plate or the lower surface plate of the shelf, the unusable area due to the erroneous insertion prevention structure does not occur on the back panel.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a structure for preventing incorrect insertion of a printed wiring board according to the present invention will be described with reference to FIGS. FIG. 1 is a partially cutaway perspective view of a structure for preventing an erroneous insertion of a printed wiring board, and FIG. 2 is a plan view showing a state in which a printed wiring board on which a power supply circuit is mounted is inserted into a connector for a power supply circuit and a partially enlarged view thereof. FIG. 3 is a plan view showing a state in which a printed wiring board for a general signal processing circuit is about to be inserted into a connector for a power supply circuit and a partially enlarged view thereof, and FIG. 4 shows dimensions of a printed wiring board on which a shelf and a power supply circuit are mounted. 5A, 5B, and 5C are plan views showing the dimensions of the shelf and the printed wiring board.

In FIG. 1, reference numeral 1 denotes a unit such as an electronic device. The unit 1 has a hollow rectangular parallelepiped shape composed of an opening 3 of a shelf 2 and a back panel 4 constituting the bottom of the shelf 2. The printed wiring board 5 is mounted. The back panel 4 constitutes a wiring board, a plurality of connectors 6 are mounted on the board, and plays a role of mutual wiring of the plurality of printed wiring boards 5.

The upper plate 13 and the lower plate 1 of the shelf 2
4, a pair of upper and lower guide rails 7 are provided corresponding to the connectors 6 on the back panel 4. The guide rail 7 may be formed by cutting the upper plate 13 and the lower plate 14 themselves and bending them inward.

The printed wiring board 5 has various electronic components 21.
Is mounted, and the connector 8 is provided at the end portion on the insertion side. The printed wiring board 5 is guided by the guide rails 7 and inserted through the opening 3 of the shelf 2. The connector 8 and the connector 6 mounted on the back panel 4 are fitted to each other, and the printed wiring board 5 is inserted. It is done.

In the electronic equipment, for example, the input power is always applied to the connector 6 facing the position of the slot 9a into which the printed wiring board 5a having the power supply circuit is inserted. Therefore, when the printed wiring board 5b of a general signal processing circuit is mistakenly inserted into the slot 9a and the connector 6 and the connector 8 are fitted to each other, an overcurrent flows into the printed wiring board 5b of the pudding and the printed wiring board 5b is inserted into the printed wiring board 5b. Mounted electronic component 21 (eg, integrated circuit)
May be damaged. Therefore, in an electronic device having the unit 1 in which a plurality of printed wiring boards are mounted, a printed wiring board that can be inserted into the slot 9a into which the printed wiring board 5a having a power supply circuit is inserted is
Only the printed wiring board 5a on which the power circuit is mounted,
The condition that the printed wiring board 5b of the general signal processing circuit cannot be inserted into the slot 9a is required.

As shown in FIG. 2, a printed wiring board 5a is provided.
A notch 10 is formed at the corner portion of the end portion on the insertion side of the notch 10, and the notch 10 has a shape corresponding to the notch 10.
The erroneous insertion prevention part 11 having a position and dimensions that do not interfere with
It is fixed immediately before the back panel 4 in the slot 9a of the upper surface plate 13 of the shelf 2 without contacting the back panel 4. The erroneous insertion prevention part 11 is formed of a rectangular metal plate. Specific examples include cold rolled steel sheets, corrosion-resistant aluminum alloy sheets, and cold stainless rolled steel sheets that are generally distributed in the market. More specifically, a cold rolled steel sheet is suitable because it is inexpensive to manufacture.

As a method of fixing the erroneous insertion preventing portion 11, there are rivet fixing, screw fixing, welding, and adhesion. More specifically, riveting is preferred. This is because the positioning is easy, accurate, and easy to assemble. The slot 9b into which the printed wiring board 5b of the signal processing circuit is inserted is not provided with an erroneous insertion prevention part.

Further, as shown in FIG. 3, since there is no cutout at the corner of the insertion side end of the printed wiring board 5b, when it is inserted into the slot 9a of the shelf 2, it is fixed to the top plate 13 of the shelf 2. The erroneous insertion prevention unit 11 hits the erroneous insertion prevention unit 11 and cannot be inserted any further.

Next, the dimension of the erroneous insertion prevention portion 11 in the plate thickness direction will be described with reference to FIG. The dimension of the printed wiring board 5 is A, the distance between the guide rails 7 provided on the upper surface plate 13 and the lower surface plate 14 of the shelf 2 is B, and the distance between the printed wiring board 5 and the distance between the upper and lower guide rails 7 of the shelf 2. Is C, these are in the relationship of B-A = C, while the plate thickness dimension D of the misinsertion preventing portion 11 is
Is D> C. On the other hand, when the dimension of the notch 10 of the printed wiring board 5a in the board width direction is E, (BD)>
The relationship is (AE).

Further, the size and position of the erroneous insertion prevention portion 11 in the board insertion direction will be described with reference to FIGS. 4 and 5. The distance from the connector 6 mounting surface of the back panel 4 to the insertion side end of the printed wiring board being inserted is F,
The protruding dimension of the pin in the connector 6 mounted on the back panel 4 from the back panel 4 is G, and the printed wiring board 5 of the pin in the connector 8 mounted on the printed wiring board 5
Let H be the protruding dimension from the end on the insertion side of F = G +
When it becomes H, the fitting of the printed wiring board 5 starts.
Let F at this time be F1. Then, F when completely fitted is defined as F2. Here, if the dimension from the mounting surface of the connector 6 of the back panel 4 to the end of the erroneous insertion prevention portion 11 on the opening 3 side is K, then K> F1. On the other hand, when the dimension in the insertion direction from the end of the cutout 10 on the insertion side of the printed wiring board 5 is L, L + F2> K.

In summary, the erroneous insertion prevention unit 11
D> C and K> F1 are satisfied, the upper plate 13 of the shelf 2 is fixed to the upper plate 13 at a position where it does not contact the back panel 4, and the notch 10 has E> D-C and L>.
It is formed so as to satisfy the conditions of K-F2. As a method of inserting / removing the printed wiring board 5, when the insertion / extraction lever 12 using the lever principle is used in order to overcome the force required for fitting the connectors 6 and 8 into and out, the misinsertion prevention unit 11 3 is provided at a position where the erroneous insertion prevention portion 11 and the printed wiring board 5 interfere with each other before the insertion / extraction lever 12 acts, as shown in FIG.

Next, the operation will be described. Slot 9
The only printed wiring board that can be inserted into a is the printed wiring board 5a on which the power supply circuit is mounted, and the slot 9a
The case where the printed wiring board 5b of the general signal processing circuit cannot be inserted will be described. When the printed wiring board 5b of the general signal processing circuit is inserted into the slots (slots 9b) other than the slot 9a, since there is no erroneous insertion prevention plate 11 in the slot 9b, the printed wiring board 5b is not disturbed by anything. It can be inserted and the connector 6 mounted on the back panel 4 and the connector 8 mounted on the printed wiring board 5b can be fitted together.

This printed wiring board 5b is placed in the slot 9a.
, The printed wiring board 5b is guided by the guide rail 7 from the opening 3 of the shelf 2 toward the back panel 4, and then the connector 6 of the back panel 4 is inserted.
When the distance F from the mounting surface to the insertion side end of the printed wiring board 5b in the middle of insertion becomes F = K, the insertion side end of the printed wiring board 5b collides with the erroneous insertion prevention part 11, and I can't go any further. At this time, the incorrect insertion prevention unit 1
Since the end of the No. 1 on the side of the opening 3 is at the position of K> F1, F> F1 is established and the printed wiring board 5b cannot be inserted into the slot 9a. As a result, the printed wiring board 5b of the general signal processing circuit will not be erroneously fitted into the connector 6 to which the input power is always applied, and an overcurrent will not flow into the printed wiring board 5b. It is possible to avoid damage to the electronic component 21 mounted on the.

On the other hand, when the printed wiring board 5a having the notches 10 formed at the corners on the insertion side is inserted into the slot 9a, the guide rail 7 guides and inserts the same as described above. , Notch 1 even if F = K
Since 0 exists, it does not interfere with the erroneous insertion prevention plate 11 and continues to move toward the back panel 4. Cutout 10
Since the dimension L in the inserting direction satisfies the condition of L = K−F2, even if F = F2, which is the condition for completing the insertion, F +
L> K holds, and the printed wiring board 5a completes insertion without interfering with the erroneous insertion prevention plate 11.

When the insertion / extraction lever 12 is used as an insertion / extraction method for the printed wiring board, the printed wiring board 5b is guided by the guide rails 7 and moves toward the back panel 4, as shown in FIG. Before the insertion / extraction lever 12 operates, it collides with the erroneous insertion prevention plate 11 and cannot be inserted any further. As a result, it becomes impossible to insert the connectors 6 and 8 before the force necessary for fitting them is applied. Therefore, it is determined that the incorrect insertion has occurred, and even if the incorrect insertion occurs, it is caused by the insertion / extraction lever 12. The force using the lever principle does not act on the printed wiring board 5b, and the risk of deformation or damage of the printed wiring board can be avoided.

Specific dimensions of the erroneous insertion prevention plate 11 in the plate thickness direction will be described. For example, the width dimension of the printed wiring board 5 is 194 + 0, -0.3 mm, and the distance between the guide rails 7 provided on the upper plate 13 and the lower plate 14 of the shelf 2 is 194.3 + 0.2, -0.2 mm. Then, the clearance between the printed wiring board 5 and the space between the upper and lower guide rails of the shelf 2 is 0.1 to 0.8 mm. Therefore, the plate thickness dimension D of the incorrect insertion prevention plate 11 is D> 0.8 mm.
It is. In consideration of a certain amount of interference, in the case of using a cold-rolled steel plate, the plate thickness dimension D of the incorrect insertion prevention portion 11 is D =
1.6 mm is preferred.

Next, the specific dimensions of the erroneous insertion prevention portion 11 in the board insertion direction will be described. The protruding dimension G of the pin in the connector 6 mounted on the back panel 4 from the back panel 4 is 11.9 + 0.2, −0.2 mm, and the pin in the connector 8 mounted on the printed wiring board 5 is of,
Assuming that the projecting dimension H from the insertion side end of the printer wiring board 5 is 11.7 + 0.2 and −0.2 mm, the dimension F1 at which the printed wiring board 5 starts to fit is F1 = 24 mm. For example, assuming a clearance of 1 mm,
The dimension K from the connector 6 mounting surface of the back panel 4 to the end of the wrong insertion prevention portion 11 on the opening 3 side of the shelf 2 is
K = 25mm is good.

Printed wiring board 5 on which a power supply circuit is mounted
Notch 10 formed in the corner of the insertion side end of a
The specific dimensions of will be described. As described above, the erroneous insertion prevention portion 11 having the plate thickness dimension D = 1.6 mm is attached to the shelf 2
When fixed to the slot 9a of the upper surface plate 13 with K = 25 mm, the dimension E of the notch 10 of the printed wiring board 5a in the board width direction is E> 1.5 mm (1.6-0.1 to 0.8).
Becomes For example, assuming a clearance of 0.5 mm, the dimension E of the notch 10 in the substrate width direction is E = 2.0.
mm is good. The dimension L of the insertion method from the end of the notch 10 on the insertion side of the printed wiring board is
When the distance F2 from the mounting surface of the connector 6 of the back panel 4 to the end on the insertion side of the printed wiring board is 15 mm, L> 10 mm. For example, as clearance 1
Considering mm, L = 11 mm is preferable.

Further, when the insertion / extraction lever 12 is used as the insertion / extraction method for the printed wiring board, the distance from the mounting surface of the connector 6 of the back panel 4 to the end on the insertion side of the printed wiring board when the insertion / extraction lever 12 starts to operate. 28 mm
Then, the erroneous insertion prevention plate 11 is fixed to the position where K> 28 mm. For example, if a clearance of 1 mm is expected, a position of K = 29 mm is preferable. Notch 10 at this time
The dimension L of the printed wiring board from the end on the insertion side in the insertion direction is L> 14 mm. If a clearance of 1 mm is expected, L = 15 mm is preferable.

With such a specific structure, when the printed wiring board 5b is inserted into the slot 9a, the printed wiring board 5b is guided by the guide rail 7 from the opening 3 of the shelf 2 and advances toward the back panel 4. When the distance from the connector 6 mounting surface of the back panel 4 to the insertion side end of the printed wiring board becomes 25 mm, the insertion side end of the printed wiring board 5b hits the erroneous insertion prevention section 11, I can't go any further. The dimension of the printed wiring board 5 to be fitted is such that the distance from the mounting surface of the connector 6 of the back panel 4 to the end portion on the insertion side of the printed wiring board 5 is 24 mm.
Cannot be inserted into the slot 9a. As a result, the printed wiring board 5b of the general signal processing circuit will not be erroneously fitted into the connector 6 to which the input power is always applied, and an overcurrent will not flow into the printed wiring board 5b. Electronic component 21 mounted on
You can avoid damage.

On the other hand, when the printed wiring board 5a having the notches 10 formed at the corners of the end portion on the insertion side is inserted into the slot 9a, the guide rail 7 guides and inserts the same as described above. Since the notch 10 exists even if the distance from the mounting surface of the connector 6 of the back panel 4 to the end of the printed wiring board on the insertion side is 25 mm, it does not interfere with the erroneous insertion prevention plate 11, and the back panel Continue to move toward 4. Even if the distance from the connector 6 mounting surface of the back panel 4 to the insertion-side end of the printed wiring board is 15 mm at which insertion is completed, 15 mm + 11 mm>
25 mm (F + L = K) is established, and the printed wiring board 5a completes insertion without interfering with the erroneous insertion prevention plate 11.

When the insertion / extraction lever 12 is used as a method for inserting / extracting the printed wiring board, the printed wiring board 5b is used.
Is guided by the guide rail 7 and proceeds toward the back panel 4, but if the erroneous insertion prevention plate 11 is located at the position of K = 29 mm, the insertion / extraction lever 12 starts to operate. From the mounting surface to the printed wiring board 5
Before the distance to the end portion on the insertion side of 28 mm becomes 28 mm, it hits the erroneous insertion prevention portion 11 and cannot be inserted any more. As a result, it becomes impossible to insert the connectors 6 and 8 before the force necessary for fitting them is applied. Therefore, it is determined that the incorrect insertion has occurred, and even if the incorrect insertion occurs, it is caused by the insertion / extraction lever 12. The force using this principle does not act on the printed wiring board 5b, and the risk of deformation of the printed wiring board can be avoided.

A second embodiment of the erroneous insertion prevention structure for a printed wiring board according to the present invention will be described with reference to FIG. In FIG. 6, the erroneous insertion prevention part 11 is formed by cutting and bending the top plate 13. In the second embodiment, only the top plate 13 is cut and bent, and the metal plate in the first embodiment is not needed, so that the cost can be further reduced.

A third embodiment of the erroneous insertion prevention structure for a printed wiring board according to the present invention will be described with reference to FIG. In FIG. 7, the erroneous insertion prevention portion 11 is formed by drawing the upper surface plate 13. In the third embodiment, only the upper surface plate 13 is drawn, and the metal plate in the first embodiment is not required, so that the cost can be further reduced.

Further, in the above-mentioned embodiment, the erroneous insertion preventing portion 11 is formed on the upper surface plate 13, but the invention is not limited to this, and it may be formed on the lower surface plate 14.

[0037]

As described above, in the erroneous insertion prevention structure for a printed wiring board according to the present invention, since the erroneous insertion prevention part having a simple shape is simply formed, the manufacturing cost can be reduced and the simple structure can be achieved. Can be structured. Further, since both ends in the width direction of the printed wiring board are sandwiched by the grooves of the guide rails provided on the upper and lower sides of the shelf when the printed wiring board is inserted into the shelf, it becomes an area where component mounting and pattern wiring cannot be performed. Since the notch for avoiding the interference with the erroneous insertion preventing portion is provided at the position including the impossible area, the reduction of the pattern wiring area of the printed wiring board can be suppressed. Further, since the position where the erroneous insertion preventing portion is attached is the upper surface plate or the lower surface plate of the shelf, it is possible to prevent an unusable region due to the erroneous insertion preventing structure on the back panel.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment of a structure for preventing incorrect insertion of a printed wiring board according to the present invention.

FIG. 2 shows a plan view and a partially enlarged view of a state in which a printed wiring board on which a power supply circuit is mounted is inserted into a connector for a power supply circuit according to the present invention.

FIG. 3 shows a plan view and a partially enlarged view of a state in which a printed wiring board of a general signal processing circuit is about to be inserted into a connector for a power supply circuit according to the present invention.

FIG. 4 is a plan view showing dimensions of a printed wiring board on which a shelf and a power supply circuit according to the present invention are mounted.

5A, 5B, and 5C are plan views showing the dimensions of a printed wiring board on which a shelf and a power supply circuit according to the present invention are mounted.

FIG. 6 is a partial cross-sectional view of a second embodiment of the structure for preventing incorrect insertion of a printed wiring board according to the present invention.

FIG. 7 shows a partial cross-sectional view of a third embodiment of the structure for preventing the incorrect insertion of the printed wiring board according to the present invention.

8A and 8B are plan views of a conventional printed wiring board used for a structure for preventing an erroneous insertion of the conventional printed wiring board.

FIG. 9 is a perspective view of a back panel used for a conventional structure for preventing an erroneous insertion of a printed wiring board.

[Explanation of symbols]

 1 Unit 2 Shelf 3 Opening 4 Back Panel 5a Printed Wiring Board with Power Circuit 5b Printed Wiring Board for Signal Processing Circuit 6 Connector 7 Guide Rail 8 Connector 9 Slot 10 Notch 11 Wrong Insertion Prevention Section 12 Insertion / Extraction Lever 13 Top Face plate 14 Bottom plate

Claims (4)

[Claims] 1. A shelf having a back panel for interconnecting a plurality of printed wiring boards, an upper plate and a lower plate having guide rails for guiding the printed wiring boards, and a printed wiring mounted on the shelf. A printed wiring board equipped with a power supply circuit, which comprises a board, and at least one of the upper surface plate and the lower surface plate is provided with an erroneous insertion prevention portion that interferes with insertion of a printed wiring board to be inserted into a connector for a power supply circuit of a back panel. Structure for preventing erroneous insertion of printed wiring board, characterized in that a notch is formed on the board so as not to come into contact with the erroneous insertion preventing portion, and a notch is not formed on the printed wiring boards of other signal processing circuits. . 2. The erroneous insertion prevention structure for a printed wiring board according to claim 1, wherein the erroneous insertion prevention portion is formed by fixing a plate member to an upper surface plate or a lower surface plate. 3. The erroneous insertion prevention structure for a printed wiring board according to claim 1, wherein the erroneous insertion prevention part is formed by cutting and bending an upper surface plate or a lower surface plate. 4. The erroneous insertion prevention structure for a printed wiring board according to claim 1, wherein the erroneous insertion prevention part is formed by drawing an upper surface plate or a lower surface plate.