JPH0316307Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a spacer structure that maintains a constant gap between a printed circuit board and a pedestal to prevent deflection of the circuit board.

Prior Art and Problems As shown in Figure 1, a printed circuit board 3 whose ends are fixed to a chassis 1 with screws 2
Since the electronic component 4 is mounted on the upper surface of the electronic component 4, a gap 5 is provided between the electronic component 4 and the pedestal 1 in order to prevent a shot accident between the pedestal and the pedestal 1. For this reason, the center of the board 3 is in a floating state, so when an external force is applied to the connector 7 through the cable 6 in the Y or X direction as shown in b or c in the figure, the board 3 is bent and the copper foil pattern is peeled off. This has the disadvantage of causing a short circuit accident with the frame 1. 8 is a lid.

Therefore, conventionally, a spacer as shown in FIG. 2 or 3 is used to prevent the substrate 3 from being bent.
The example in Figure 2 is a square hole (not shown) provided in the pedestal 1.
A spacer 10 is inserted from below through the board, and a tuft pin screw 11 is screwed together from the top surface of the board to keep the gap A constant. The spacer 10 has a flange 12 at the lower end.
It has a two-plate claw portion 13 that expands after passing through the square hole of the pedestal 1 to prevent it from falling off the pedestal 1. However, since the upper end of the spacer 10 is flat and only contacts the substrate 3, the screw 11 is required as a separate component in order to prevent the gap A from expanding, which has the drawback of requiring a large number of parts and man-hours.

The spacer 20 in FIG. 3, as shown in FIG. 3A, is made of a flat resin material and is formed into a vertically and horizontally symmetrical structure as shown. In other words, 2
1 and 22 are upper and lower claws, and 23 and 24 are elastic support pieces that face these claws and hold the substrate 3 or the pedestal 1 between them. This spacer structure consists of a board 3 and a stand 1.
If a hole of the same shape is formed in the hole, then the claw part 21,
Since it can be installed with only 22 press-fitting operations, the second
Compared to the example shown in the figure, the number of parts is smaller and the workability is better.
However, since the upper and lower claws 21 and 22 are both chevron-shaped (convex), they are difficult to grasp with the fingertips (slip).
Moreover, since the claw portion 22 protrudes from the lower part of the pedestal 1, it is inconvenient that if this portion is used as the bottom surface of the device, it will not be flat.

Purpose of the invention The present invention aims to provide a spacer structure that has good installation workability and has a small protrusion length to the bottom surface of the pedestal.

Composition of the Invention The present invention includes a flat brim, a prismatic body extending upward from the center of the brim, and a lower side that protrudes downward from the sides of the torso. a claw portion; a neck portion extending upward from the center of the upper end of the body;
An upper claw part that protrudes downward from the upper end of the neck part is integrally molded with a resin material, and each part above the collar part is press-fitted into the pedestal through a hole provided in the pedestal. By press-fitting only the upper claw part through a hole provided in the opposing printed circuit board, the frame is held between the collar part and the lower claw part, and the body part and the upper claw part are held together. It is characterized by having a structure in which the printed circuit board is held between them, and this will be explained in detail below with reference to the illustrated embodiment.

Embodiment of the invention FIG. 4 shows an embodiment of the invention, in which a is a perspective view of a single unit, b is a front view of the same, and c is a front view of the installed state. The spacer 30 of this example is made of a resin material, and has, in order from the bottom, a circular collar portion 31, a prismatic body portion 32, a neck portion 35, and an upper claw portion 33, and two pieces on the sides of the body portion 32. A lower claw portion 34 is formed. The gap _G1 between the lower end of the upper claw part 33 and the upper end of the body part 32 is slightly narrower than the thickness of the board 3, and elastically clamps the board 3 in the mounted state c. Lower claw part 3
Gap G ₂ between the lower end of 4 and the upper end of the collar 31 is the frame 1
This is also useful for elastically holding the pedestal 1.

A square hole 1a is formed in the pedestal 1, and is sized to pass through the body 32 of the spacer 30 and the claws 34 on both sides that have been deformed by pressure.The claws 34 expand to their original shape after passing through the square hole 1a. The pedestal 1 is held between the flange portion 31 and the flange portion 31. It is convenient for the prismatic body 32 to be prevented from rotating if the hole 1a is a square hole. On the other hand, the board 3 is provided with a round hole 3a having a diameter that allows the upper claw part 33 to pass through when it is pressed and deformed, and similarly, after passing through the hole, the claw part 33 expands and is separated from the body part 32. The substrate 3 is held between the substrates 3 and 3. The above-mentioned deformation of the claws 33, 34 is automatically performed by press-fitting the entire spacer. For this reason, both the claw parts 33 and 34 need to have a shape that expands toward the rear in the insertion direction. Incidentally, a portion corresponding to the elastic piece 23 shown in FIG. 3 may be formed at the upper end portion of the body portion 32.

Effects of the invention As described above, according to the invention, since it is a single part, the number of parts and the number of work steps can be reduced. Also, since the part you grip with your fingertips is the brim, it won't slip easily, making installation easier. Furthermore, since only the flat flange is exposed on the bottom of the pedestal,
The protrusion length is short, which is advantageous in maintaining the flatness of the bottom surface of the casing.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the deflection that occurs on a printed circuit board when no spacer is used, Figs. 2 and 3 are explanatory diagrams of conventional spacers, and Fig. 4 is a configuration diagram showing an embodiment of the present invention. . In the figure, 1 is the frame, 1a is its square hole, 3 is a printed circuit board, 3a is its round hole, 30 is a spacer, 31
32 is the body part, 33 is the upper claw part, 34
35 is a lower claw portion and a neck portion.

Claims (1)

[Scope of utility model registration request] A flat brim, a prismatic body extending upward from the center of the brim, a lower claw protruding from a side of the body so as to expand downward, and the body. A neck portion extending upward from the center of the upper end and an upper claw portion protruding downward from the upper end of the neck portion are integrally molded with a resin material, and the upper claw portion is inserted through a hole provided in the pedestal from above the collar portion. The pedestal is held between the collar portion and the lower claw portion by press-fitting each part of the pedestal and only the upper claw portion through a hole provided in a printed circuit board facing the pedestal; A spacer characterized in that the spacer has a structure in which the printed circuit board is held between the body portion and the upper claw portion.