JP3339541B2 - Board mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board mounting structure for mounting a printed board on a chassis.

[0002]

2. Description of the Related Art FIGS. 12 to 15 show a conventional substrate mounting structure. In FIG. 12, for example, four metal studs 2 are mounted on a metal chassis 1 serving as a base so as to stand, and a board 3 is mounted on the studs 2 with screws 4. Therefore, the substrate 3
Are mounted parallel to the chassis 1 by studs 2 at an appropriate height. In this case, as shown in FIG.
A mounting hole 1a for mounting the stud 2 is formed in the chassis 1, and a tip of the stud 2 is formed with a convex step. As shown in FIG. 14, the tip of the stud 2 is inserted into the mounting hole 1a. It is fixed to the chassis 1 by swaging.

[0003]

However, in the above-described conventional board mounting structure, for example, when a high-frequency component such as an oscillator is mounted on the board 3 such as a CATV receiver or a TV set receiver, The following problems occur.

(1) When such an electronic device is dropped or subjected to an impact, the screen and sound are temporarily disturbed. The reason for this depends on the location of the electronic device when it is subjected to shocks and vibrations. However, as shown in FIG. 15, the shocks and vibrations are finally transmitted to the chassis 1 serving as a base (the position shown in FIG. 15). This is because the oscillation frequency is transmitted from the chassis 1 to the stud 2 via the caulking portion and then to the substrate 3, and the oscillation frequency is disturbed. Particularly, when the chassis 1 is thin, a large impact and vibration are transmitted.

(2) Cracks occur in the substrate 3 due to stress caused by warpage of the substrate 3 or the like. The reason is that stress of the substrate 3 due to a change in environmental temperature or a change over time does not escape to the chassis 1 side.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a mounting structure of a substrate capable of preventing impact, vibration, and stress on the substrate.

[0007]

According to the present invention, a tongue having a free end is formed on a chassis, a substrate is attached to the tongue, and a stopper for limiting the amount of bending of the tongue is provided. It shall be. With this configuration, even when shocks and vibrations are applied to the chassis, these shocks and vibrations are attenuated by the free ends of the tongues, and the tongues are greatly deformed.
Preparative Runode prevented by the stopper, it is possible to reduce the shock and vibration transmitted to the substrate, and also as a stress due to changes over time or changes in environmental temperature is applied to the substrate, the stress of the tongue Since it is absorbed by the free end, it is possible to prevent the substrate from cracking.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a substrate mounting structure according to the present invention, a chassis is cut out to form a tongue having a free end, the substrate is mounted on the tongue, and the tongue is bent.
A stopper was provided to limit the volume .

The stopper is attached to the upper surface of the tongue.
It is especially possible to take the substrate through the struts on the tongue
When attaching, place a stopper between these tongues and the support.
It is preferred to attach.

Alternatively, the stopper is provided on the lower surface of the chassis.
In this case, the chassis is cut and bent and used as a stopper.
The stopper can be formed integrally with the chassis by extending so as to be able to abut on the lower side of the tongue piece .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic structure of the present invention will be described with reference to FIGS.
Referring to an example, FIG. 1 is a perspective view showing a mounting structure of a substrate according to a reference example, FIG. 2 is an exploded perspective view showing the mounting structure of FIG. 1, FIG. 3 is a shock and vibration in one of the mounting structure It is explanatory drawing which shows a propagation state, and the same member as the above-mentioned prior art example is attached | subjected the same reference sign.

In FIG. 1 and FIG. 2, for example, four rectangular tongues 11 are formed on a metal chassis 1 serving as a base by punching the plate surface in a U-shape. 11, a mounting hole 1a is formed.
Therefore, the tongue piece 11 is positioned on the short side with respect to the chassis 1.
The other three sides 11b are connected at the side 11a and are free ends.
The tongue pieces 11 are formed so as to face in the same direction, and are formed on the same plane as the plate surface of the chassis 1. Each tongue piece 11
Are mounted with metal studs 2, and a substrate 3 is mounted on these studs 2 with screws 4. A protruding step is formed at the tip of the stud 2, and is fixed to the corresponding tongue piece 11 by inserting the tip into the mounting hole 1a and caulking.

In such a configuration, even if a shock or vibration is applied to the x position of the chassis 1 in FIG. 3, the shock or vibration is transmitted to only one side 11a of the tongue piece 11 and is attenuated by the free end. Therefore, shock and vibration transmitted to the substrate 3 via the stud 2 can be reduced. In this case, the vibration cycle until the shock or vibration transmitted to the tongue piece 11 attenuates becomes longer, but the peak vibration becomes smaller, so that the maximum value of the shock or vibration transmitted to the substrate 3 can be reduced. . The elastic force increases as the longer side of the tongue 11 is longer than the shorter side, so that the effect of reducing impact and vibration can be enhanced by making the tongue 11 elongated. Further, even if a stress due to a change in environmental temperature or a change over time acts on the substrate 3, the stress is absorbed by the free end of the tongue piece 11.
Cracks can be prevented.

FIG. 4 is a perspective view showing the mounting structure of the substrate according to the first embodiment of the present invention, FIG. 5 is an exploded perspective view showing the mounting structure of FIG. 4, and FIG. 6 is a sectional view showing the stopper of FIG. The same members as those in FIGS. 1 to 3 are denoted by the same reference numerals.

In the first embodiment, a stopper 5 for limiting the amount of bending of the tongue piece 11 is added to the reference example described above . The stopper 5 has a mounting hole 5 a formed therein, and the tip of the stud 2 is fixed to the mounting hole 1 a of the tongue piece 11 through the mounting hole 5 a of the stopper 5. As shown in FIG. 6, the stopper 5 is formed to be bent substantially in a crank shape, and overlaps the upper surface of the chassis 1 by a distance X in the horizontal direction.
In addition, they are separated by a distance Y in the vertical direction.

According to such a configuration, since the tongue piece 11 is formed flush with the chassis 1, the tip of the stopper 5 is separated from the plate surface of the chassis 1 by a distance as shown in FIG. When the tongue 11 is bent downward in this state, the tip of the stopper 5 comes into contact with the surface of the chassis 1, so that the tongue 11 can be prevented from being greatly bent.

FIG. 7 is a sectional view showing a stopper according to a second embodiment of the present invention, and FIG. 8 is a perspective view showing the stopper of FIG.

The second embodiment is different from the first embodiment in that a stopper 5 for limiting the amount of bending of the tongue piece 11 is provided.
However, it is attached to the lower surface of the chassis 1 with the screw 6 instead of the upper surface of the tongue piece 11. in this case,
The stopper 5 bent and formed in a substantially crank shape is attached so as to overlap the lower surface of the tongue piece 11 horizontally by a distance X and vertically by a distance Y. Therefore, when the tongue piece 11 bends downward, the lower surface on the free end side of the tongue piece 11 comes into contact with the tip of the stopper 5, so that the tongue piece 11 can be prevented from being largely bent.

FIG. 9 is a sectional view showing a stopper according to a third embodiment of the present invention, and FIG. 10 is a perspective view showing the stopper of FIG.

The third embodiment differs from the second embodiment in that the stopper 5 is not a separate member but is formed integrally with the chassis 1. That is, the stopper 5 is attached to the tongue piece 1.
1 is punched out in a U-shape, and the tip of the chassis 1 is bent downward by 180 ° so as to overlap the lower surface of the tongue piece 11 horizontally and vertically. It is separated in the direction.

FIG. 11 is a perspective view showing a mounting structure of a substrate according to another reference example . In this reference example , the stud 2 is omitted, and a substantially central portion of the tongue piece 11 is bent upward by 90 ° and its tip end is bent. The substrate 3 is configured to be directly attached to the substrate. In this case, a protrusion 11c is formed at the tip of the tongue piece 11, and the substrate 3 is fixed to the tongue piece 11 by passing the protrusion 11c through the substrate 3 and caulking. According to such a configuration, the tip side half 11d of the tongue piece 11 can be used in place of the stud 2, and the remaining half 11e coupled to the chassis 1 can reduce shock and vibration.

[0022]

As described above, according to the present invention,
Forming a tongue having a free end on the chassis, it limits the tongue attached to the substrate to Rutotomoni, the amount of deflection of the tongue piece strike
Even if shocks and vibrations are applied to the chassis, these shocks and vibrations are attenuated by the free ends of the tongues , and the tongues are not significantly deformed , and are therefore transmitted to the substrate. In addition, even if stress is applied to the board due to changes in the environmental temperature or changes over time, the stress is absorbed by the free end of the tongue, causing cracks on the board. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a mounting structure of a substrate according to a reference example .

FIG. 2 is an exploded perspective view showing the mounting structure of FIG.

FIG. 3 is an explanatory diagram showing a state of propagation of shock and vibration in the mounting structure of FIG. 1;

FIG. 4 is a perspective view showing a substrate mounting structure according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view showing the mounting structure of FIG. 4;

FIG. 6 is a sectional view showing the stopper of FIG. 4;

FIG. 7 is a sectional view showing a stopper according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing the stopper of FIG. 7;

FIG. 9 is a sectional view showing a stopper according to a third embodiment of the present invention.

FIG. 10 is a perspective view showing the stopper of FIG. 9;

FIG. 11 is a perspective view showing a substrate mounting structure according to another reference example .

FIG. 12 is a perspective view showing an example of a conventional substrate mounting structure.

FIG. 13 is an exploded perspective view showing the mounting structure of FIG.

FIG. 14 is a sectional view showing an attached state of the stud of FIG. 12;

FIG. 15 is an explanatory diagram showing a state of propagation of shock and vibration in the mounting structure of FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis 1 2 Stud (post) 3 Substrate 5 Stopper 11 Tongue piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/04 H05K 7/14

Claims (5)

(57) [Claims] 1. A forming a tongue having a free end by notching the chassis, attaching the substrate to the tongue Rutotomoni, tongue
A mounting structure for a substrate, comprising a stopper for limiting an amount of bending of a piece . 2. The substrate mounting structure according to claim 1, wherein said stopper is attached to an upper surface of said tongue piece . 3. The substrate is attached to the tongue piece via a column.
The substrate mounting structure according to claim 2 , wherein the stopper is mounted between the tongue piece and the support post . 4. The stopper is provided on a lower surface of the chassis.
Attachment structure of the substrate according to claim 1, wherein the girder. 5. The stopper is formed by notching the chassis.
This stopper is applied to the lower side of the tongue.
The mounting structure for a substrate according to claim 4 , wherein the mounting structure extends so as to be accessible .