JPH054560U - Vibration prevention structure for printed circuit boards - Google Patents

Abstract

(57) [Abstract] [Purpose] A printed circuit board can be pressed and held by a relatively simple structure to prevent lateral displacement, and even when the printed circuit board array pitch is narrow, it can be effectively dealt with. [Structure] In a state where the printed boards 3A, 3B, 3C are removably inserted into the case 1 along guides 4A, 4B, 4C provided in the case 1, the printed boards 3A, 3B are held by the holding plates 6A, 6B. In the vibration preventing structure for a printed circuit board in which 3C is pressed and held in the insertion direction, the holding plates 6A and 6B that are in contact with the edges of the printed circuit boards 3A, 3B and 3C have the printed board 3A on both sides of the edge. 3B,
It is provided with a push-out protrusion 9 that holds 3C.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is mainly applied to a device in which a printed circuit board is inserted into and removed from a case, and relates to a vibration prevention structure for a printed circuit board that presses and holds the printed circuit board so that it does not rattle in the case. is there.

[0002]

[Prior Art]

 Generally, in a device in which a large number of printed circuit boards are inserted into the case at predetermined intervals and arranged, the printed circuit board is inserted into the case along the guides provided on the case and the The printed circuit board is pressed and fixed in the insertion direction by a holding plate made of a material. This prevents rattling of the printed circuit board (the rattling in the width direction of the guides provided on the case) due to the effect of vibration applied to the device.

However, in the above-mentioned holding plate, since an elastic material such as sponge is used as a member for preventing the vibration of the printed circuit board, in the long-term, the material is permanently deformed and the pressing force is increased. There was a problem that it weakened and the vibration prevention effect decreased. In addition, when the environment in which the equipment is installed is in a severe condition against vibration, a holding plate made of this kind of sponge cannot obtain sufficient pressure holding force.

[0004]

[Problems to be solved by the device]

 Further, as a structure for preventing the lateral displacement of the printed circuit board, it is conceivable to form a groove for receiving the edge of the printed circuit board by bending the holding plate instead of the elastic material such as the sponge described above. However, when the arrangement pitch of the printed circuit boards is narrowed in order to mount multiple printed circuit boards in the case with high density, there is a problem that the holding plate by this kind of bending process cannot cope with it.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to be configured by relatively simple processing, and to press and hold the printed circuit board for a long time with sufficient pressing force to laterally shift the printed circuit board. Another object of the present invention is to provide a structure for preventing vibration of a printed circuit board, which is capable of preventing the above-mentioned problems, and can sufficiently cope with the case where the arrangement pitch of the printed circuit board is narrow.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the vibration prevention structure for a printed circuit board according to the present invention is a state in which the printed circuit boards 3A, 3B, 3C are inserted into the case along the guides 4A, 4B, 4C provided on the case 1. In a vibration prevention structure for a printed circuit board, in which the printed circuit board is fixedly held by pressing the printed circuit board in the insertion direction by holding plates 6A and 6B, the holding plate abuts both end edges of the printed circuit board to secure the printed circuit board. It is characterized in that a protruding portion 9 is formed by extruding for sandwiching.

[0007]

[Action]

 The printed board 3A, 3B, 3C is pressed and held by the elastic deflection of the holding plates 6A, 6B while the both ends of the printed board 3A, 3B, 3C are sandwiched by the extruded protrusions 9. As a result, it is possible to secure a sufficient pressure holding force for a long period of time, and it is also possible to prevent rattling of the printed boards 3A, 3B, 3C with respect to the guides 4A, 4B, 4C. Further, even when the arrangement pitch of the printed circuit boards 3A, 3B, 3C is narrow, it is possible to sufficiently cope with it.

[0008]

【Example】

 FIG. 1 is a view showing an embodiment of a vibration preventing structure for a printed circuit board according to the present invention, which is a partially exploded perspective view of the printed circuit board in a pulled-out state. The front part of the case 1 of the measuring device having a flat box shape constitutes an operation panel (not shown), and the substrate housing 1A is formed in the rear part.

The substrate housing portion 1A is separated from the portion 1B housing the other mechanism by the vertical partition wall 2. In addition, one large printed board 3A is loaded along the partition wall 2 in the board housing portion 1A, and two small printed boards 3B are provided at a predetermined interval from the large printed board 3A. 3C are arranged in parallel and loaded.

Further, three sets of guide rails 4A, 4B, and 4C are provided on both sides of the board housing portion 1A along both side wall surfaces of the case. The guide rails 4A, 4B, 4C guide the side edges of the printed circuit boards 3A, 3B, 3C when the printed circuit boards 3A, 3B, 3C are inserted downward from above the case 1.

Each printed circuit board 3A, 3B, 3C is equipped with a connector 5 on the lower edge thereof, and this connector 5 is provided when the printed circuit boards 3A, 3B, 3C are completely loaded into the board housing portion 1A. It is adapted to be electrically connected to a connector (not shown) provided at the bottom of the board housing portion 1A.

The holding plates 6A, 6B press and hold the printed circuit boards 3A, 3B, 3C downward and hold them in place. Engaging claws 61A, 61B are formed on the front edges of the holding plates 6A, 6B. Attachment parts 62A and 62B are formed on the rear edge. The holding plates 6A, 6B were extruded on the side facing the printed circuit boards 3A, 3B, 3C at intervals corresponding to the plate thickness H of the printed circuit boards 3A, 3B, 3C by press molding or the like. A hemispherical extrusion protrusion 9 is formed. The push-out projection 9 holds both end edges of the printed circuit boards 3A, 3B, 3C in a state where the printed circuit boards 3A, 3B, 3C are loaded in the circuit board housing 1A.

The partition wall 2 is formed with slit-shaped engaging holes 21A and 21B for receiving the engaging claws 61A and 61B. The upper ends of the engagement holes 21A and 21B are engaged with the engagement claws 61A and 61B, and the holding plates 6A and 6B are provided with sufficient elastic force so that the print substrates 3A, 3B and 3C are attached to the case 1. It is formed below, that is, at a position slightly lower than the upper ends of the holding plates 6A and 6B so as to be pressed in the insertion direction.

Further, the brackets 71, 72 provided at the rear edge of the board housing 1A have screw holes 71A for attaching the attachment portions 62A, 62B of the holding plates 6A, 6B by means of screws 8 or the like. 72B is formed.

In the configuration described above, the printed boards 3A, 3B, 3C are inserted into the board housing 1A along the guide rails 4A, 4B, 4C. Next, with the printed boards 3A, 3B, 3C loaded in the board housing 1A, the engaging claws 61A, 61B are inserted into the engagement holes 21A, 21B, and the holding boards 6A, 6B are used to remove the printed boards 3A, 3B. 3B and 3C are pressed in the insertion direction. Then, when the mounting portions 62A, 62B are screwed to the brackets 71, 72 with screws 8, elastic deflection in the direction perpendicular to the surfaces of the holding plates 6A, 6B further presses the printed circuit boards 3A, 3B, 3C in the inserting direction. It is fixed and held.

At this time, the extrusion protrusions 9 are located on both sides of the edges of the printed circuit boards 3A, 3B, 3C, and the extrusion protrusions 9 extend from the left and right sides of the edges of the printed circuits 3A, 3B, 3C. Since it works so as to sandwich it, it is possible to prevent the guide rails 4A, 4B and 4C from rattling in the width direction and to prevent the lateral displacement of the printed circuit boards 3A, 3B and 3C.

By the way, in the above-described embodiment, the extruded protrusions 9 have a hemispherical shape, and the printed boards 3A, 3B, 3C are shown in a solid line state by the elastic force acting on the holding plates 6A, 6B as shown in FIG. Has the function of guiding and pinching it to the state of the dotted line (regular position), but the shape of this extrusion protrusion is not limited to a hemispherical shape, but an ellipse extending in the direction of the edge of the printed circuit board. It may be formed into a shape such as an elongated beet.

Further, as shown in FIG. 5, because of the high-density mounting of the printed boards 3A, 3B, 3C, when the arrangement pitch is narrow, one extruded protrusion 9 prevents lateral displacement of the left and right printed boards. It may be configured as follows. In addition, it is not necessary for the pair of left and right extrusion protrusions 9 to be arranged facing each other, and even if the protrusions 9 are arranged in a zigzag pattern along the longitudinal direction of the edges of the printed circuit boards 3A, 3B, 3C, the above-described embodiment may be adopted. The same effect as can be obtained.

Further, since the holding plates 6A and 6B fix and hold the plurality of printed circuit boards 3A, 3B and 3C with a sufficient pressing force in the insertion direction of the board housing portion 1A, the holding plates 6A and 6B are respectively held. It can also be used as a common ground plate for the printed boards 3A, 3B, 3C.

[0020]

[Effect of the device]

 As described above, according to the vibration prevention structure for a printed circuit board of the present invention, the holding plate that abuts against the edge of the printed circuit board has the protruding protrusions that sandwich the printed circuit board on both sides of the edge. By using the elastic deflection of the holding plate to press and hold the printed circuit board, it is possible to secure a sufficient pressing force for a long period of time compared to the conventional holding plate made of sponge, and moreover, the printed circuit board against the guide in the case. It can prevent rattling. Further, since the protrusions are formed on the holding plate by extrusion, it is possible to sufficiently deal with the structure even if the arrangement pitch of the printed circuit boards is narrow.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a vibration prevention structure for a printed circuit board according to the present invention, in which a partially exploded perspective view of the printed circuit board is pulled out;

FIG. 2 is a perspective view of an assembled state in the embodiment.

FIG. 3 is a vertical sectional view of the same embodiment.

FIG. 4 is a vertical cross-sectional end view of the extrusion protrusion portion in the example.

FIG. 5 is a vertical cross-sectional view showing a usage state of a holding plate according to another embodiment of the present invention.

[Explanation of symbols]

 1 Case 3A, 3B, 3C Printed circuit board 4A, 4B, 4C Guide rail 6A, 6B Holding plate 9 Extrusion protrusion (protrusion)

Claims (1)

[Claims for utility model registration] [Claim 1] A guide (4) provided on the case (1)
A, 4B, 4C) along with the printed circuit board (3A, 3B,
3C) is inserted in the case, the holding plate (6A, 6B) presses the printed circuit board in the insertion direction to fix and hold the printed circuit board in the vibration preventing structure of the printed circuit board. Projection (9) by extrusion that abuts both edges and clamps the printed circuit board
A vibration-proof structure for a printed circuit board, wherein: