JPH09266389A - Module board latching mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a module board having a large flexibility for a dimensional accuracy. SOLUTION: When a module board 4 is fixed to a connector 1 by engaging latches 2 provided in the connector 1 into notches 3 made in the module board 4, a dimensional variation may cause the notches 3 of the module board 4 to be shifted from top points of the latches 3, so that a latching mechanism will not work properly. In order to avoid such a situation, the notches 3 of the module board 4 are made into a rectangular shape. Thereby the flexibility of dimensional accuracy of the connector and module board can be made large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch mechanism of a module board for fixing a module board such as a memory to a latch provided on a connector side by a self-locking operation.

[0002]

2. Description of the Related Art As a mechanism for fixing a module board,
A latch mechanism has been proposed in which a module board is inserted into a connector and a latch provided on the connector side is engaged with the module board by a self-locking operation to fix the module board. JEDEC, American National Standards Organization
(Joint Electron Device E
Nineering Council) is MO-16
In 0 (standard), as a memory module substrate, a structure is proposed in which a semicircular cutout having a radius of 2 mm is provided in the engaging portion of the latch. When the memory module board is inserted into the connector and pushed in the direction of the latch, the semi-circular cutout portion spreads the springy latch. When the module board is further pushed in, the notch portion enters under the latch, and the latch returns to its original position and comes to the upper surface of the module board, so that the module board is fixed by the latch.

[0003]

In the case of the cutout shape such as the semicircular shape, a mechanism of pushing the module board in the latch direction and expanding the latch at the cutout portion to latch the module board is used. Even if you press
The latch mechanism may not work because the tip of the latch does not spread to the cutout portion of the module substrate due to the dimensional tolerance between the connector and the module substrate and an error in assembly work. Also,
If you continue to press it hard after that, it may damage the latch or the board. As described above, in the conventional mechanism, the dimensional accuracy of the connector and the board is severe.

An object of the present invention is to provide a module substrate latch mechanism having a large degree of freedom in dimensional accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention provides a module board latch mechanism in which a module board is inserted into a connector and at the same time a latch provided on the connector side engages the module board by a self-locking operation to fix the module board. The object is achieved by making the notch of the module substrate with which the latch engages rectangular.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the entire structure thereof, FIG. 1 is an overall perspective view when a memory module substrate is mounted, and FIG. 2 is an overall perspective view before the memory module is mounted. In the connector 1, the lead 5 and the reinforcing metal member 6 are soldered to the substrate 10,
It is attached to the substrate 10. A large number of ICs 8 are mounted on the memory module substrate 4 to form a memory module. The memory module substrate 4 is inserted into the receptacle contact 12 of the connector 1 from an oblique direction in accordance with the direction of the reverse insertion prevention key 9. The memory module substrate 4 and the connector 1 are connected by the connector 11 of the substrate 4 and the contact 12 of the connector 1. However, at this point, the connection between the contact 12 and the plug 11 of the memory module is unstable. Therefore, the memory module board 4 which is diagonally engaged is fixed in the direction of the board 10 by engaging the latch 2 provided on the connector 1 side with the rectangular cutout 3 provided on the module board 4. Contact 12
Maintain proper contact force with.

3, 4 and 5 show enlarged views of the latch mechanism portion. 3 is an enlarged view of the latch mechanism portion immediately before latching, FIG. 4 is an enlarged view of the latch mechanism portion during latching, and FIG. 5 is an enlarged view after latching.
The shape of the latch 2 is such that the portion 2a is tapered at the top and bottom and left and right. The memory module substrate 4 is the substrate 10
When the rectangular notch 3 of the memory module substrate 4 is pushed into the apex 2a of the latch 2, the substrate end face of the notch 3 pushes the taper portion of the latch 2. The latch 2 has a spring property, and accordingly, the latch 2 has a structure that draws a circle around the movable kerf 14 and spreads laterally. When the tip 2b of the latch 2 enters the range of the notch 3 of the memory module board 4, the latch 2 returns to the original position and the latch tip 2b comes to the upper surface of the memory module board 4. As a result, the memory module substrate 4 has the latch 2
Since it is on the upper surface, it cannot return to the original diagonal position, and the substrate 4 is fixed at that position.

When the memory module substrate 4 is removed, the latch is released by pushing the release metal fitting 7 of the latch 2 outward, and the memory module substrate 4 returns to the oblique angle at the time of insertion. The memory module board 4 inserted at an angle is pinched with fingers.

FIG. 6 shows a conventional example corresponding to FIG. The notch 3a of the memory module substrate 4a has a semicircular shape so as to surround the latch 2. In order to explain the difference from the memory module substrate 4 according to the present invention, the notch 3 (rectangular shape) of the memory module substrate 4 according to the present invention is shown by a broken line in FIG. An imaginary line 13 indicates a line that is parallel to the substrate end face and that passes through the apex 2a of the latch 2. Notch 3a on the outside of the release metal fitting 7 side from the virtual line
When hit, the latch 2 is applied with a force in a narrowing direction, does not move in a pushing-out direction, and the latch mechanism cannot be operated. However, if the notch 3a hits the inside of the imaginary line, the notch 3a can be extended toward the substrate 10 while unfolding the latch 2 to engage the latch. When the notch 3a and the latch 2 are displaced as shown in FIG. 6, the notch 3a
The latch 2 first hits the portion 2c. Since the portion 2c is the release metal fitting 7 side which is outside the imaginary line 13,
Even if the module board 4a is pushed, the latch 2 is only deformed downward, and the latch 2 does not spread laterally. However, in the present invention, since the notch is shown as the broken line 3, the latch 2 and the notch 3 always come first in the portion 2d, and since the memory module substrate 4 is always inside the virtual line 13, the notch 3 is present. The latch can be unfolded and advanced towards the substrate 10.

7 and 8 show an overall view of the substrate of the memory module, FIG. 7 shows one embodiment of the present invention, and FIG. 8 shows a conventional example. The present invention makes the notch shape into a rectangular shape and waits for the latch apex in a wide range,
The sliding part of the latch apex can be shortened. The corner portion in the cutout may have a minimum corner R.
As a result, the range of waiting for the latch apex is widened as compared with the semi-circular shape of the conventional example, so that it is possible to absorb the error in the relative position deviation between the connector latch and the board cutout.

[0012]

According to the present invention, the dimensional tolerances of the connector and the module board can be absorbed, so that it is not necessary to increase the dimensional accuracy of the connector and the board, and the degree of freedom of the dimensional accuracy can be increased. In addition, it is easy to assemble because there is no need to worry about variations in assembly.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a memory module substrate mounted on an embodiment of the present invention.

2 is an overall perspective view of the memory module substrate shown in FIG. 1 before mounting.

FIG. 3 is an enlarged view of a latch mechanism portion immediately before the latch shown in FIG. 1 is applied.

FIG. 4 is an enlarged view of a latch mechanism portion in the middle of engaging the latch shown in FIG.

5 is an enlarged view of a latch mechanism portion after the latch shown in FIG. 1 is engaged.

FIG. 6 is a view showing a conventional latch mechanism.

7 is an external view of the memory module substrate shown in FIG.

FIG. 8 is an external view of a conventional memory module board.

[Explanation of symbols]

1: Connector, 2: Latch, 2a: Latch apex, 2b:
Latch tip, 3: Notch, 4: Memory module board, 5: Lead, 6: Reinforcing metal fitting, 7: Release metal fitting, 8: I
C, 9: Reverse insertion prevention key, 10: substrate, 11: plug, 1
2: Contact

Claims (1)

[Claims] 1. A module board latch mechanism for fixing a module board by inserting a module board into a connector and engaging a latch provided on the connector side with the module board in a self-locking operation at the same time. A module board latch mechanism, wherein a notch of the module board has a rectangular shape.