JPS5816358B2 - Board fixing device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a printed wiring board used in electrical equipment such as a color television receiver, in which heavy components such as a tuner and a flybank transformer are mounted on a printed wiring board. This invention relates to a substrate fixing device that holds a board.

[Technical background of the invention and its problems]

Considering its purpose, if all electrical components are mounted on a printed wiring board, there will be no need for lead wires to connect the components.
This is preferable in terms of manufacturing electrical equipment.

However, electrical parts include light parts such as 2-3x8-degree resistors, capacitors, and coils, as well as heavy parts such as tuners, flyback transformers, and electrolytic capacitors that are 200-300r long, and these heavy parts are mounted on printed wiring boards. When you post it,
Vibrations during product transportation and shocks caused by poor handling of cargo caused cracks and damage to printed wiring boards.

In order to prevent such accidents, conventionally a structure as shown in Fig. 1 has been adopted.

Around the flybank transformer 12 mounted on the printed wiring board 10, a heat dissipation plate 14, which is also mounted on the printed wiring board, is bent into an L shape.
and the heat sink 14 were connected by a connector 16.

By integrating the flybank transformer and the heat dissipation plate with a connector, the heavy load is received over a wide area of the printed wiring board, and a part of the weight that was being received locally is dispersed and the printed wiring board This is a measure against damage.

Such a completed printed circuit board was attached to a chassis or inserted into a board mounting frame provided in a cabinet.

However, this level of countermeasure was not sufficient and damage accidents occurred as in the case when no countermeasures were taken.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a board fixing device that allows easy assembly and fixing work and prevents damage to printed wiring boards.

[Summary of the invention]

A mounting body connected to a heavy component is arranged near the important component mounting part in the printed wiring board, and a positioning hole is provided in this mounting body, and a protrusion is provided on the back cover of the mounting body. It is designed to prevent damage to the printed wiring board by inserting it into a positioning hole provided in the mounting body.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 5.

That is, the housing 23 shown in FIG. 2 is the outer housing of the television receiver of the present invention, 24 is the bottom plate of this housing, and 2 is the outer housing of the television receiver of the present invention.
5 is a top plate, and 26 and 27 are side plates.

A front frame 28 is provided with an opening 29 for arranging the image side of the cathode ray tube.

A back cover 30 is provided for the rear opening of the housing 23, and a first wiring board guide portion is provided on the inner surface of the bottom plate 24 from the rear opening toward the front frame 28. ,
Second frames 3L32 are arranged in parallel at appropriate intervals.

The first and second frames have left and right edges 357, 3 of the printed wiring board 35 extending in the longitudinal direction on opposite sides thereof.
Grooves 33 and 34 capable of holding the wires 52 therein are provided as wiring board guide portions.

Therefore, by sliding the printed wiring board 35 into the grooves 33 and 34 from the rear opening side of the housing 23, the printed wiring board 35 can be arranged in parallel with the bottom plate 24.

In this case, the rear end 352 of the printed wiring board 35, that is, the end corresponding to the rear opening of the casing, is fixed to the third frame 36 with screws R, , R2, for example.

Since this third frame 36 is disposed between the first and second frame members 13L32, the printed wiring board 35 is held by the U-shaped frame.

In this case, the printed wiring board 35 has its front end 35
4 are lips 37, 38 integrally molded inside the front frame 28.
It may be further supported by

- As explained above, the printed wiring board 35 used in the board fixing device of the present invention has the third frame λ'36 fixed to the rear end 353', and the first frame 36 provided in the housing 23. ,
It is accommodated in the grooves 33, 34 of the second frame 31, 32.

Furthermore, the reinforcing structure of the printed wiring board, which is a feature of the present invention, will be explained with reference to FIGS. 3 and 4.

Figure 3a shows the printed wiring board shown in Figure 1 at the rear end 53.
FIG. 3 is a partially enlarged perspective view of FIG.

Around the heavy components 47 such as flyback transformers, tuners, electrolytic capacitors, etc. mounted on the printed wiring board 35, heat dissipation plates and other heavy components 47 mounted on the printed wiring board are indirectly held or Mounting body 5 such as a supporting mounting plate
0 into an L shape.

Furthermore, a connecting tool 60 that connects and integrates the mounting body 50 and the heavy component 47 is fixed by screwing or the like.

Further, on the surface of the mounting body 50 facing the back cover 30, there are positioning holes 50. A locking portion consisting of the following is provided.

It is preferable that the positioning hole 501 be provided in a direction away from the upper part of the mounting body 50, that is, the upper surface of the printed wiring board, and a printed wiring board configured in this manner is a completed printed wiring board product.

On the other hand, as shown in FIG. 2, the back cover 30 is provided with protruding pieces 39 and 40 at its lower end.
A through hole T provided at the rear end of the bottom plate 24 forming a part of the
7. When inserted into T2, the housing 23 and back cover 30 are positioned.

The positioning hole 50 provided in the mounting body 50 of such a back cover 30. A locking means consisting of a protrusion 55 is provided at a position facing the.

In detail, the protrusion 55 may be formed integrally with the back cover if a synthetic resin material is used for the back cover.
If a plate material (bird board, wood), etc. is used for the back cover, a screw insertion hole 54 is provided in the protrusion forming part of the back cover, and a separately prepared protrusion 55 is screwed into it, as shown in Figure 4. Bye.

This protrusion 55 has a thin tip, and the positioning hole 50
1, but when the back cover 30 is fixed to the housing 23 in the normal mounting position, the protrusion 55 and the positioning hole 501 provided in the mounting body 50 have approximately the same diameter, and this protrusion 55 It is provided in a relationship to prevent movement of the mounting body 50.

Like this. The constructed product is the finished back cover.

The completed printed wiring board and the completed back cover may be assembled into the housing 23 as shown in FIG. 5.

FIG. 5A is an explanatory diagram showing the printed wiring board being installed in the middle. FIG. 5C is an explanatory diagram showing the completed installation. FIG. 5C is an explanatory diagram showing the back cover being installed in the middle.

That is, the first and second frames 3 provided within the housing 23
1. Insert and accommodate both side ends of the finished printed wiring board with the third frame attached to the grooves 32, and insert the protruding pieces 39 and 40 of the finished back cover into the through holes provided in the bottom 24 of the housing. T1.
When inserted into T2, the printed wiring board is fixed because the back cover blocks the direction in which the printed wiring board is removed.

This back cover is in contact with a third frame attached to the rear end of the printed wiring board, and the protrusions 39, 40 are inserted into through holes T, T2.

To further explain the installation situation of this completed camera back, Figure 5C
As shown in , the back cover 30 has a through hole T1. It is attached to be inserted into T2.

The protruding pieces 39 and 40 form the through hole T1. When inserted into T2, the back cover 30 is still in an inclined state, and the locking means formed by the protrusion 55 provided on the back cover is the locking means formed by the positioning hole 501 formed in the mounting body 50 of the printed wiring board. Although it has not yet been inserted into the stop, from this state, move the back cover 30 to the housing 2.
By pressing against the back side of the projection 50.3, the tip of the protrusion 55 fits into the positioning hole 50.3. The mounting body 50 is inserted into the mounting body 50 so as to prevent the mounting body 50 from shifting.

Note that the back cover 30 has screw insertion holes 62 provided at both ends thereof.
The printed circuit board is firmly held because it is screwed to the back of the case using screws.

〔Effect of the invention〕

As explained above, the force of the heavy components conventionally received by the printed circuit board is hardly applied to the printed circuit board, and is now received by the locking means consisting of the projection 55 provided on the back cover 30, and the force is absorbed by the projection 55. This is an extremely effective means of preventing damage to printed circuit boards because it is distributed from the back cover to the bottom plate 24 of the housing.

Also, this measure does not require any special assembly work (
, it was possible to prevent damage to the printed circuit board simply by adding a back cover to the case, which had a very large effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a part of a conventional printed circuit board, FIG. 2 is a perspective view illustrating an embodiment of the board fixing device of the present invention, and FIG. 3 a is a perspective view showing a printed wiring board of the present invention. Figures 4 and 5 are enlarged perspective views of the main parts, Figure 4 is a partially exploded perspective view of the camera back, Figure 5
Figure a is an explanatory view showing the printed wiring board being installed in the middle, b is an explanatory view showing the same installation is completed, and figure C is an explanatory view showing the back cover being installed in the middle. 23... Housing, 30... Back cover, 35...
...Printed wiring board, 41...Heavy parts, 5
0...Mounting plate, 501...Positioning hole (locking part), 55...Protrusion (locking means), 60
・・・・・・Connector.

Claims (1)

[Claims] 1. A casing having a rear opening, a printed wiring board disposed within the casing, heavy components such as a flyback transformer and a tuner attached to the printed wiring board, and the weight of the casing. a connector attached to the component; a mounting body connected to the connector and placed near the heavy component and attached to the printed wiring board; a locking portion provided on the mounting body; and the casing. A substrate fixing device comprising: a back cover that closes a rear opening; and a locking means provided on the back cover and engaging with a locking portion of the mounting body. 2. The substrate fixing device according to claim 1, wherein a locking means is provided on the additional plate, and a locking portion is provided on the back cover.