JPH0697681A - Stopping structure of printed wiring board - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a printed wiring board having an ejector for pulling out a printed wiring board, which can easily hold and release the printed wiring board with respect to a housing of an electronic device. [Structure] When the printed wiring board 22 is inserted into the housing 21, the stopper 26 provided on the housing 21 via an elastic member 29 prevents the printed wiring board 22 from being pulled out, and the ejector is used to pull out the printed wiring board 22. When 33 is rotated in a predetermined direction, the stopper release portion 33a provided on the ejector 33 releases the stopper 26 from retaining the printed wiring board 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board retaining structure for a printed wiring board having an ejector for extracting the board.

[0002]

2. Description of the Related Art FIGS. 16 and 17 show a conventional mounting structure of a printed wiring board on a housing of an electronic device.

A plurality of connectors 3 are provided on the motherboard 1a on the back side of the housing 1 so as to correspond to the printed wiring board 2 mounted in the housing 1. Further, guide rails 4 are provided on the upper and lower surfaces of the housing 1 so as to correspond to the respective connectors 3.

On the other hand, the printed wiring board 2 is provided with a connector 6 which is electrically connected to the connector 3 on the front end side, and an ejector 8 for pulling out the board is supported at upper and lower corners on the base end side. It is rotatably attached via a shaft 9.

The printed wiring board 2 is mounted on the housing 1 by inserting the upper and lower edges of the printed wiring board 2 into the guide rail 4 and using the guide rail 4 as a guide to guide the arrow a.
Slide in the direction, and finally the back part 8 of the ejector 8.
This is done by applying a finger to a and pressing it (Fig. 17).
(A)). With this, the printed wiring board 2 is inserted into the housing 1, and the connector 6 is electrically connected to the connector 3 (FIG. 17B).

On the other hand, when the printed wiring board 2 is pulled out from the housing 1, the ejector 8 is rotated in the direction of arrow b. Thus, the end portion 8b of the ejector 8 presses the edge portion 1b of the housing 1, and the printed wiring board 2 is slid in the arrow c direction by the "lever principle" with the end portion 8b as a fulcrum (FIG. 1).
7 (c)).

According to this conventional printed wiring board mounting structure, since the printed wiring board 2 is held in the housing 1 by the fitting force of the connector 3 and the connector 6, vibration and shock are not generated. Connector 3 when acting on 1
In some cases, the printed wiring board 2 may come off the housing 1 due to the disengagement of the connector 6 from the connector 6. Therefore, conventionally, as shown in FIG.
As shown in FIG.
The printed wiring board 2 was fixed by means of 3 to prevent the printed wiring board 2 from coming off, but it was very complicated because the fixing plate 11 had to be attached and detached by detaching the screw 13 every time the printed wiring board 2 was inserted and removed. .

[0008]

As described above, since the printed wiring board is held in the housing by the fitting force between the connectors in the above structure, the fitting between the connectors is disengaged when vibration or impact is applied. The printed wiring board sometimes came out of the housing. On the other hand, if the fixed plate for retaining the printed wiring board is screwed to the housing, there is a problem that the fixing plate must be attached and detached every time the printed wiring board is inserted and removed.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a retaining structure for a printed wiring board which can easily retain and release the printed wiring board from the housing. And

[0010]

According to a first aspect of the present invention, there is provided a printed wiring board to which an ejector for drawing out a substrate is rotatably attached, the housing being the printed wiring board inserted into a housing of an electronic device. In a retaining structure for a printed wiring board that prevents the printed wiring board from slipping out of the housing, the housing is attached to the housing via an elastic member, and the movement of the printed wiring board in the direction of coming out of the housing is performed by the printed wiring board. A stopper that abuts and blocks is provided, and the ejector contacts the stopper side when the printed wiring board is rotated in a direction to pull out the printed wiring board from the housing, and the ejector is other than a position that blocks the printed wiring board. It is configured to have a stopper releasing portion for moving it to the position.

According to the second aspect of the present invention, the printed wiring board, to which the ejector for pulling out the substrate is rotatably attached, prevents the printed wiring board inserted in the housing of the electronic device from coming off from the housing. In the printed wiring board retaining structure, the ejector is rotatably attached to the printed wiring board through a support shaft and an elongated hole into which the support shaft is inserted, and within the range of the elongated hole using the support shaft as a guide. The ejector is provided with a second engaging portion that is slidable and that fits into a first engaging portion provided on the housing, and the second engaging portion is the printed wiring board. The configuration is such that when the ejector is slid in a direction intersecting the insertion direction of the printed wiring board with the board inserted in the housing, the ejector can be fitted into the first engaging portion. ing.

According to a third aspect of the present invention, a printed wiring board to which an ejector for pulling out a substrate is rotatably attached and which prevents the printed wiring board inserted into the housing of an electronic device from coming off the housing. In the printed wiring board retaining structure, the ejector is a groove portion engaged with a support shaft provided on the printed wiring board, a pressing portion when the ejector is used for extracting a substrate, and a hole formed in the housing. And a pressing portion that engages with the support shaft with the groove in one direction while the printed wiring board is inserted into the housing, and the pressing portion is centered on the support shaft. As the ejector is rotated in a predetermined direction, the housing is pressed so that the printed wiring board can be moved through the support shaft in a direction opposite to the insertion direction. Is When the printed wiring board is inserted into the housing, the groove can be fitted into the hole when the groove is engaged with the support shaft in the other direction opposite to the one direction. It is arranged in.

According to a fourth aspect of the present invention, a printed wiring board to which an ejector for pulling out a substrate is rotatably attached and which prevents the printed wiring board inserted in the housing of an electronic device from coming off the housing. In the printed wiring board retaining structure, a middle portion of a lever is rotatably attached to the ejector, and the lever is biased by a spring in a direction opposite to a rotation direction of the ejector when the printed wiring board is pulled out. , One end side of the lever is arranged so that it can be fitted into a hole formed in the housing by the action of the spring at a position where the printed wiring board is inserted into the housing, and the other end of the lever The side is arranged so that it can be rotated together with the ejector in the rotation direction when the printed wiring board is pulled out.

[0014]

According to the first aspect of the invention, when the printed wiring board is inserted into the housing of the electronic device, the stopper provided on the housing via the elastic member prevents the printed wiring board from moving in the direction of coming out of the housing. When the ejector is rotated in a predetermined direction so as to pull out the printed wiring board from the housing, the stopper is moved by the stopper releasing portion provided on the ejector, and the lock of the printed wiring board by the stopper is released.

In the second invention, when the ejector is slid in a direction intersecting the inserting direction while the printed wiring board is inserted in the housing of the electronic device with the support shaft as a guide, the second engaging member provided on the ejector. First joint part is provided in the housing
The printed wiring board is locked to the housing by fitting with the engaging portion of the. Further, when the printed wiring board is pulled out, the ejector is slid in the opposite direction to release the lock, so that the ejector can freely rotate with respect to the support shaft, and the printed wiring board is pulled out from the housing by the lever principle of the ejector.

According to the third aspect of the invention, with the printed wiring board inserted in the housing of the electronic device, the groove portion of the ejector is engaged with the support shaft in the other direction so that the protruding portion of the ejector is the hole portion of the housing. The ejector plays a role of preventing the printed wiring board from coming off by being fitted to the printed wiring board. If the ejector mounting position is changed with respect to the support shaft and the ejector groove is oriented in one direction to engage with the support shaft, the ejector becomes rotatable with respect to the support shaft, and the lever of the ejector causes the printed wiring board to move. Can be pulled out from the housing.

According to the fourth aspect of the invention, when the printed wiring board is inserted into the housing of the electronic device, the one end side of the lever, which is rotatably held in the middle of the ejector, is formed in the housing by the action of the spring. The printed wiring board is prevented from coming off the housing. Further, when pulling out the printed wiring board from the housing, by rotating the ejector and the lever in the rotation direction when pulling out the printed wiring board, the fitting between the one end side of the lever and the hole portion of the housing is released, The lever principle of the ejector allows the printed wiring board to be pulled out from the housing.

[0018]

Embodiments of the present invention will be described in detail below with reference to FIGS.

1 to 4 are views for explaining an embodiment according to the first invention, and FIG. 1 is a perspective view for explaining a retaining structure.
2 is a cross-sectional view thereof, FIG. 3 is a view for explaining a lock when the printed wiring board is inserted, and FIG. 4 is a view for explaining a lock release when the printed wiring board is pulled out.

The housing 21 of the electronic device has the same structure as the conventional example.
A motherboard 21a is provided on the back side thereof, and a plurality of connectors 23 are provided corresponding to the printed wiring board 22 mounted in the housing 21. Further, guide rails 24 are provided on the upper and lower surfaces of the housing 21 so as to correspond to the respective connectors 23. Furthermore, stoppers 26 are provided on the board insertion port sides of the respective guide rails 24.
Is provided.

As shown in FIGS. 1 and 2, the stopper 26 has its base end fixed to a "U" -shaped elastic member 29 interposed between the inner wall 21b of the housing 21 and the rail base 27. The spring force of the elastic member 29 causes the tip 26a to
The side is projected from the rail base 27. In addition, in order to limit the amount of protrusion of the stopper 26, a protrusion 26b that comes into contact with the rear surface of the rail base 27 is provided on the side surface of the stopper 26, and the stopper is provided by the printed wiring board 22 inserted into the housing 21. So that 26 can be pushed down easily
An inclined surface is formed at the tip 26a of the stopper 26.

On the other hand, the printed wiring board 22 is provided with a connector 31 which is electrically connected to the connector 23 on the front end side, and ejector 33 for pulling out the substrate is supported at the upper and lower corners on the base end side. It is rotatably attached via 34. The ejector 33 is provided with a stopper 2 when the ejector 33 is rotated to pull out the printed wiring board 22.
A stopper release portion 33a for pushing down 6 is provided.
The tip side corner portion 22a of the printed wiring board 22 is provided with a stopper 26 when the printed wiring board 22 is inserted into the housing 21.
Is chamfered so that can be easily pushed down.

Next, with reference to FIGS. 3 and 4, description will be given of how to prevent the printed wiring board 22 from coming off and how to release it.

When the printed wiring board 22 is slid in the direction of arrow a in order to insert the printed wiring board 22 into the housing 21, as shown in FIG.
The slope of 6a and the slope of the corner 22a of the printed wiring board 22 face each other. Therefore, when the printed wiring board 22 is further slid in the direction of the arrow a, the stopper 26 is pushed down by the pressing force of the printed wiring board 22.
As shown in (b), the printed wiring board 22 is attached to the stopper 26.
It can be inserted into the guide rail 24 without being hindered by.
Then, the back surface 33b of the ejector 33 is pressed in the direction of arrow a, and the connector 31 is fitted into the connector 23 as shown in FIG. It is electrically connected to the connector 23. Further, when the printed wiring board 22 is completely inserted into the housing 21, the restoring force of the elastic member 29 causes the stopper 26 to project to the rear end 22b side of the printed wiring board 22 and the housing of the printed wiring board 22. The stopper 26 prevents the body 21 from coming off.

On the other hand, when the printed wiring board 22 is pulled out from the housing 21, the ejector 33 is rotated in the direction of arrow b. As a result, as shown in FIG. 4A, the stopper release portion 33a positioned near the elastic member 29 is moved to the elastic member 2
The elastic member 29 is pushed by the stopper 26.
Bends in the descending direction. Therefore, as shown in FIG. 4B, the lock of the printed wiring board 22 by the stopper 26 is released. Then, when the ejector 33 is further rotated in the direction of the arrow b, the end portion 33d of the ejector 33 is moved to the housing 2
The printed wiring board 22 is slid in the direction of arrow c by pushing the edge 21d of No. 1 and the end 33d as a fulcrum in the "lever principle" (FIG. 4C), and the fitting of the connectors 23 and 31 is released. To do.

As described above, in the retaining structure of this embodiment, when the printed wiring board 22 is inserted into the housing 21, the stopper 26 automatically retains the printed wiring board 22 so that the printed wiring board 22 is removed from the housing 21. Ejector 3 to pull out
When 3 is rotated in the direction of arrow b, the stopper 26 is automatically released from the retainer, so no additional man-hours are required for retaining and releasing the printed wiring board 22.

FIGS. 5 to 7 are views for explaining an embodiment according to the second invention. FIG. 5 is a front view showing a state in which a printed wiring board is retained by using an ejector, and FIG. 6 is an ejector. FIG. 7 is a front view of the state in which the retainer is released, and FIG. 7 is a front view of the state in which the printed wiring board is pulled out by the ejector.

In the retaining structure of this example, a receiving bracket 41 having a U-shaped cross section is provided in the vicinity of the guide rail 24 for inserting the printed wiring board provided in the housing 21A.

On the other hand, an elongated hole 331 and a groove (second engaging portion) 332 are formed in the ejector 33A attached to the printed wiring board 22A. The ejector 33A is attached to the printed wiring board 22A by inserting the support shaft 34 of the printed wiring board 22A into the elongated hole 331. The ejector 33A is rotatable about the support shaft 34 and within the range of the elongated hole 331. The support shaft 34 can be slid as a guide. Further, the width of the groove 332 is approximately the same as the plate thickness of the receiving metal fitting 41, so that the printed wiring board 22A can be connected to the housing 21A.
When the ejector 33A is slid by using the support shaft 34 as a guide, the plate portion (a first engagement member) of the plate portions 41a and 41b of the receiving metal fitting 41 facing each other is close to the guide rail 24. Groove 3) in joint part 41b
32 can be fitted.

Next, the operation of the retaining structure will be described.

When the printed wiring board 22A is inserted into the housing 21A, as shown in FIG. 7, after the end portion 335 of the ejector 33A is positioned inside the receiving metal fitting 41, the ejector 33A is rotated in the direction of arrow d. , The end portion 335 is the plate portion 4
The printed wiring board 22A is slid in the direction of the arrow a by the "lever principle" with the end portion 335 as a fulcrum, and the printed wiring board 22A is completely inserted into the housing 21A (FIG. 6). A connector (not shown) provided at the tip of the printed wiring board 22A is connected to a connector (not shown) in the housing 21A.

Then, in the state shown in FIG. 6, when the ejector 33A is slid in the direction of arrow e using the support shaft 34 as a guide, the groove 332 is fitted in the plate portion 41b, and the printed wiring board 22A comes out of the housing 21A. The ejection is blocked by the ejector 33A (FIG. 5).

On the other hand, the printed wiring board 22A is attached to the housing 21A.
When pulling out the ejector 33 from the state shown in FIG.
Slide A in the direction of arrow f. The ejector 33A is now in the state shown in FIG. 6, and the printed wiring board 22A
Is unlocked. Then, as shown in FIG. 7, when the ejector 33A is rotated in the direction of arrow b, the ejector 3A is rotated.
The end portion 335 of 3A presses the plate portion 41b, and the end portion 335 is used as a fulcrum to perform the "lever principle".
Is slid in the direction of arrow c.

As described above, in the retaining structure of this embodiment, the printed wiring board 22A is retained by sliding the ejector 33A in the direction of the arrow e with the printed wiring board 22A inserted in the housing 21A. By sliding the arrow mark in the direction of arrow f, the retainer by the ejector is released, and thus the retainer and release of the printed wiring board 22A can be easily performed.

8 to 11 are views for explaining an embodiment according to the third invention, FIG. 8 is a perspective view of an ejector, and FIG.
Is a side view of the printed wiring board to which the ejector is attached,
FIG. 10 is a front view showing a state in which the printed wiring board is pulled out by using the ejector, and FIG. 11 is a front view in a state in which the printed wiring board is retained by using the ejector.

In the retaining structure of this example, the ejector 33B is provided with a groove 337 having a U-shaped cross section. By hooking the groove 337 on the support shaft 34 of the printed wiring board 22B, the ejector 33B prints. It is attached to the wiring board 22B.

Then, the printed wiring board 22 is mounted on the housing 21B.
With B inserted, as shown in FIG.
When the ejector 33B is hooked on the support shaft 34 with the groove 337 facing upward and the ejector 33B is rotated in the direction of arrow b, the ejector 3
The end portion (pressing portion) 338 of 3B is the edge portion 211 of the housing 21B.
The printed wiring board 22B is slid in the direction of arrow c, which is a direction in which the printed wiring board 22B is pulled out from the housing 21B, by pressing, and using the “lever principle” with the end portion 338 as a fulcrum.

Further, the printed wiring board 22B is mounted on the housing 21B.
11, the groove 337 faces downward and is hooked on the support shaft 34, and the projection portion 33 of the ejector 33B is inserted into the hole portion 212 formed in the housing 21B.
9 is fitted, the ejector 33B allows the housing 21
The printed wiring board 22B is prevented from coming off from B.

As described above, in the retaining structure of this example, the housing 21
The groove 3 is formed on the support shaft 34 of the printed wiring board 22B inserted in
When the ejector 33B is engaged with 37 directed upward, the ejector 33B plays a role of pulling out the printed wiring board 22B, and when the groove 337 is engaged with the support shaft 34 downward, the ejector 33B is engaged with the printed wiring board. 22B
Plays a role in preventing In addition, the printed wiring board 22B
On the other hand, since the ejector 33B is removable, the housing 21
When a plurality of printed wiring boards 22B are mounted on B,
When pulling out the printed wiring board 22B, another printed wiring board 2
Since the 2B ejector 33B can be used, it is not always necessary to provide the two ejector 33B on one printed wiring board 22B.

12 to 15 are views for explaining the fourth embodiment. FIG. 12 is a front view of a printed wiring board having an ejector, FIG. 13 is a bottom view of the printed wiring board, and FIGS. [Fig. 6] is a view for explaining retaining and releasing of the printed wiring board by a lever provided on the ejector.

In this example, the support shaft 3 of the printed wiring board 22D is used.
The middle portion of the ejector 33D is rotatably held by the ejector 33D, and the middle portion of the lever 52 is rotatably held by the end portion 51 of the ejector 33D via a pin 53.
Further, the grip portion (other end) 521 of the lever 52 is pulled in the direction of arrow d by the spring 55, and the end surface 523 of the tip end portion (one end) 522 of the lever 52 is an inclined surface.

On the other hand, in the case 21D into which the printed wiring board 22D is inserted, as shown in FIG.
The hole 21 that fits with the tip 522 of the lever 52 near the
5 is formed.

In this example, when the printed wiring board 22D is inserted into the guide rail 24 and further slid in the direction of the arrow a, which is the inserting direction, the tip end face 523 of the lever 52 comes into contact with the edge 216 of the housing 21D, The lever 52 is slightly rotated in the direction of the arrow b, and the front end 522 of the lever 52 is positioned near the hole 515 (FIG. 15). Then, when the printed wiring board 22D is further slid in the direction of arrow a and completely inserted into the housing 21D, the lever tip portion 5
22 is positioned at a position corresponding to the housing hole 215,
The tip portion 522 is fitted into the hole portion 215 by the tensile force of the spring 55. Therefore, the removal of the printed wiring board 22D from the housing 21D is prevented by the lever 52 in which the tip portion 522 fits into the hole portion 215.

On the other hand, the printed wiring board 22D is attached to the housing 21D.
When the lever 52 is pulled out, the lever 52 is rotated in the direction of the arrow b, and the ejector 33D is rotated together with the lever 52 in the direction of the arrow b. By rotating the lever 52 in the direction of arrow b, the lever tip portion 522 comes out from the hole portion 215, and the lever 52
The retaining of the printed wiring board 22D due to is released. Then, by rotating the ejector 33D in the direction of the arrow b,
As shown in FIG. 15, the end portion 51 of the ejector 33D presses the housing edge portion 216, and the printed wiring board 22D is slid in the direction of arrow c, which is the direction in which the printed wiring board 22D exits from the housing by the “lever principle”.

As described above, in the retaining structure of this embodiment, when the printed wiring board 22D is inserted into the housing 21D, the lever 52 automatically retains the printed wiring board 22D.
When the printed wiring board 22D is pulled out from the housing 21D, if the lever 52 is rotated in the rotation direction of the ejector 33D for pulling out, the retaining of the printed wiring board 22D by the lever 52 is released. And it can be easily released.

[0046]

As described above, according to the first invention,
When the printed wiring board is inserted into the housing of the electronic device, the stopper provided on the housing through the elastic member automatically prevents the printed wiring board from being pulled out, and the ejector is pulled in the predetermined direction to pull out the printed wiring board. When rotated, the stopper release portion provided on the ejector automatically releases the retainer by the stopper, so that no special work is required for retaining and releasing the printed wiring board.

Further, in the second invention, when the ejector is slid in the predetermined direction while the printed wiring board is inserted into the housing of the electronic device with the support shaft as a guide, the second engaging portion provided on the ejector is provided. The printed wiring board is retained by fitting to the first engaging portion provided on the housing, and when the printed wiring board is pulled out using the ejector, the ejector slides in the direction opposite to the predetermined direction. Then, the retaining of the printed wiring board is released, and the ejecting can be performed by the ejector, so that the retaining of the printed wiring board and the release thereof can be easily performed.

In the third aspect of the invention, with the printed wiring board inserted in the electronic device, the groove portion of the ejector faces the other direction and engages with the support shaft so that the protruding portion of the ejector fits into the hole portion of the housing. By doing so, the printed wiring board is prevented from coming off, and when the groove part of the ejector is oriented to one direction and engages with the support shaft, the printed wiring board can be pulled out by the ejector. Can be done easily.

In the fourth invention, when the printed wiring board is inserted into the housing of the electronic device, one end of the lever rotatably held by the ejector is fitted in the hole formed in the housing by the action of the spring. The printed wiring board is automatically retained, and when pulling out the printed wiring board, the retaining of the printed wiring board is released by rotating the lever in the direction of the ejector rotation when pulling out the printed wiring board. Therefore, the printed wiring board can be easily retained and released.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a retaining structure for a printed wiring board according to an embodiment of the first invention.

FIG. 2 is a sectional view of the retaining structure.

FIG. 3 is a diagram illustrating a lock when the printed wiring board is inserted in the retaining structure.

FIG. 4 is a diagram illustrating unlocking when the printed wiring board is pulled out in the retaining structure.

FIG. 5 is a diagram illustrating an embodiment of the second invention, and is a front view of a state in which a printed wiring board is retained by using an ejector.

FIG. 6 is a front view of a state where the retainer of the printed wiring board by the ejector is released.

FIG. 7 is a front view of the printed wiring board pulled out by the ejector.

FIG. 8 is a perspective view of an ejector according to an embodiment of the third invention.

FIG. 9 is a side view of a printed wiring board to which the ejector is attached.

FIG. 10 is a front view showing a state in which a printed wiring board is pulled out using the ejector.

FIG. 11 is a front view showing a state in which the printed wiring board is retained by using the ejector.

FIG. 12 is a view for explaining the embodiment of the fourth invention, and is a front view of a printed wiring board having an ejector.

FIG. 13 is a bottom view of the printed wiring board.

FIG. 14 is a diagram illustrating a state in which the printed wiring board is prevented from being pulled out by a lever provided on an ejector of the printed wiring board.

FIG. 15 is a diagram illustrating a state in which the retaining of the printed wiring board by the lever is released.

FIG. 16 is a perspective view showing a conventional printed wiring board mounting structure.

FIG. 17 is a diagram illustrating insertion and removal of the printed wiring board with respect to the housing.

[Explanation of symbols]

21 housing 22 printed wiring board 26 stopper 29 elastic member 33 ejector 34 support shaft 33a stopper releasing portion 21A housing 22A printed wiring board 33A ejector 331 elongated hole 332 second engaging portion 41b first engaging portion 21B housing 212 (Housing) Hole 22B Printed Wiring Board 33B Ejector 337 Groove 338 Pressing Part 339 Projection 21D Housing 251 (Housing) Hole 22D Printed Wiring Board 33D Ejector 52 Lever 521 (Lever) Other End 522 One end side (of lever) 55 Spring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Kozo Yamada, 1-chome, 3-chome, Asahigaoka, Hino-shi, Tokyo, Toshiba Corporation Hino factory (72) Inventor, Ichiro Kasahara, 3-chome, Asaigaoka, Hino-shi, Tokyo Stock Company Toshiba Hino Factory

Claims (4)

[Claims] 1. A printed wiring board to which an ejector for extracting a substrate is rotatably attached, which prevents the printed wiring board inserted into the housing of an electronic device from coming off the housing. In the retaining structure, the housing is provided with a stopper that is attached to the housing via an elastic member and that blocks movement of the printed wiring board in a direction of coming out of the housing by contacting the printed wiring board and preventing the movement.
The ejector is provided with a stopper releasing portion that comes into contact with the stopper side and moves the stopper to a position other than a position where the printed wiring board is blocked when the printed wiring board is rotated in a direction of pulling out the printed wiring board from the housing. The structure that prevents printed wiring boards from being pulled out. 2. A printed wiring board to which an ejector for extracting a substrate is rotatably attached, the printed wiring board being inserted into the housing of an electronic device to prevent the printed wiring board from coming off from the housing. In the retaining structure, the ejector is rotatably attached to the printed wiring board through a support shaft and an elongated hole into which the support shaft is inserted, and is slidable within the range of the elongated hole using the support shaft as a guide. Further, the ejector is provided with a second engaging portion that fits with a first engaging portion provided in the housing, and the second engaging portion includes the printed wiring board in the housing. The print is characterized in that it is arranged so that it can be fitted into the first engaging portion when the ejector is slid in a direction intersecting the insertion direction of the printed wiring board while being inserted into the body. Wiring board With a retaining structure. 3. A printed wiring board to which an ejector for pulling out a substrate is rotatably attached and which prevents the printed wiring board inserted in the housing of an electronic device from coming off the housing. In the retaining structure, the ejector is fitted with a groove portion that is engaged with a support shaft provided on the printed wiring board, a pressing portion when the ejector is used for extracting a substrate, and a hole portion formed in the housing. The pressing portion engages the shaft with the groove portion in one direction in a state where the printed wiring board is inserted into the casing, and the ejector is centered around the shaft. When the printed wiring board is rotated in a predetermined direction, the housing is pressed to move the printed wiring board through the support shaft in a direction opposite to the insertion direction. wiring When the plate is inserted into the housing, the groove is arranged so that it can be fitted into the hole when engaged with the support shaft in the other direction opposite to the one direction. The printed wiring board retaining structure that is characterized by 4. A printed wiring board to which an ejector for extracting a substrate is rotatably attached, the printed wiring board being inserted into the housing of an electronic device to prevent the printed wiring board from coming off from the housing. In the retaining structure, the middle of the lever is rotatably attached to the ejector, and the lever is biased by a spring in a direction opposite to the rotation direction of the ejector when the printed wiring board is pulled out, and One end side is arranged so that it can be fitted into a hole formed in the casing by the action of the spring at a position where the printed wiring board is inserted into the casing, and the other end side of the lever is the printed circuit board. A printed wiring board retaining structure, which is arranged so as to rotate together with the ejector in a rotation direction when the wiring board is pulled out.