JPS6236380Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to equipment such as branchers, distributors, mixers, and duplexers used in cable television broadcasting, and particularly relates to equipment with a structure in which a printed circuit board is mounted inside the housing. .

This type of equipment has a metal casing with input/output terminals on the side for connecting external cables and connectors, and a printed circuit board with circuit components mounted on it.
The input/output terminal provided on the printed circuit board and the input/output terminal of the casing are connected by soldering or the like.

By the way, in this type of equipment, it is necessary to electrically connect the ground of the printed circuit board and the casing for shielding and the like. Therefore, conventionally, in the case of a die-cast case, a through hole for screws was provided at the ground end of the printed circuit board in order to secure the printed circuit board, and a screw receiving part was provided at the corresponding position on the bottom of the case to support the printed circuit board. Then, the printed circuit board was screwed to the housing, and the two were electrically connected. However, in this conventional device, since the screw through holes are provided, the space at the ground end on the board becomes large, which poses a problem that becomes an obstacle in reducing the size of the printed board. Also, when assembling, multiple pieces (usually 4 pieces)
The disadvantage is that it is time consuming and difficult to work as it requires turning the screws in the book.

This invention was made in view of these points,
The configuration does not use screws to secure the printed circuit board to the case or to connect the ground end of the printed circuit board to the case, reducing the space at the ground end, making it easier to miniaturize the printed circuit board, and reducing the time and effort during assembly. To provide cable television broadcasting equipment that improves workability by eliminating screw fixing work that requires .

In order to achieve such an objective, the present invention mounts a printed circuit board on which circuit components are mounted inside a housing having input/output terminals on the side, and connects the input/output terminals of the printed circuit board with the input/output terminals of the housing. In addition to connecting the
In a cable television broadcasting device in which the ground end of a printed circuit board and a casing are connected, the casing is formed by opening the top and bottom surfaces, and a top plate and a bottom plate that cover the openings are each made separately. established in
A printed circuit board is mechanically fixed to the bottom plate, and the ground end of the board is electrically connected, and the bottom plate is slidably welded to the casing, and the side part of the bottom plate is pressed to an appropriate position on the side of the casing. At the same time, the upper surface plate is attached to the upper opening of the housing.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of the cable television broadcasting equipment of the present invention with the top plate removed;
Figure 2 shows A with the top plate of the above embodiment installed.
-A sectional view. The printed circuit boards shown in FIGS. 1 and 2 above and FIG. 5 described below are as follows:
For the sake of simplicity, illustration of the mounting state of electronic circuit components is omitted.

The cable television broadcasting equipment of the present invention shown in FIGS. 1 and 2 is related to a mixer/brancher, and includes a casing 1 having input/output terminals on the side,
A top plate 2 to be attached to the upper opening of the housing 1, a bottom plate 3 to be attached to the bottom opening of the housing 1, and a printed circuit board 4 fixedly supported by the bottom plate 3 and installed in the housing 1. It consists of

As shown in FIG. 3, the casing 1 is made of aluminum die-casting or the like and is formed into a substantially rectangular parallelepiped shape with open top and bottom surfaces, and has male screw tubes for input/output terminals on its longitudinal side surfaces. 14 is provided protrudingly. As shown in FIG. 2, the upper opening 11 is slightly tapered so as to expand toward the upper end, and is configured to press and hold a top plate 2, which will be described later, when it is attached. There is. Upper plate guides 18, 18 for guiding spring pieces of the upper plate 2, which will be described later, are protruded from the longitudinal center of the upper opening 11. Further, a plurality of pressing protrusions 19 are provided on the longitudinal surface of the inner side surface 16 of the housing, and the pressing protrusions 19 are provided on one side in the width direction to slide against and press a spring piece on the side of the bottom plate 3, which will be described later. A printed circuit board guide 17 is provided which engages with a notch for aligning the mounting direction of a printed circuit board 4, which will be described later. Furthermore,
An input/output terminal 15 is installed in an insulated manner inside the male spiral tube 14, and its end is connected to the inner surface 16 of the housing 1.
It is made to stick out from the outside.

The top plate 2 is made of a metal plate, for example, and has a shallow box shape by bending the circumferential side 21, as shown in FIG. Spring pieces 22 and 23 are provided protrudingly on the sides. With this arrangement, when the top plate 2 is attached to the upper opening 11 of the housing 1, the taper of the opening 11 allows the circumferential side 21 and the spring pieces 22, 23 to touch the inner circumferential wall of the opening 11. The top plate 11 is securely held in pressure contact with the top plate 11. Also, spring piece 22
is sandwiched between the upper plate guides 18, 18, and also has the function of preventing the upper plate 2 from tilting.

Note that necessary information such as the name of the device (in the case of this embodiment, mixer/brancher), model, manufacturer's name, trademark, input/output display, etc. can be printed on the top side of the top plate 2. .

The bottom plate 3 is formed of a metal plate, for example, and has a fifth
As shown in FIGS. 7 to 7, the bottom opening 12
It is formed into a substantially box shape with a rectangular bottom surface 31 having a size substantially equal to the size of the rectangular bottom surface 31, and side portions 32 provided by vertically bending an extended portion of the outer periphery thereof. A plurality of spring pieces 35 (four pieces per side in this embodiment) are provided on both longitudinal sides of the side portion 32 in correspondence with the pressing protrusions 19 provided on the housing 1, and these spring pieces 35 , 35, a slip-off prevention piece 36 having a cut and raised portion 37 projecting downward is provided, and
Guide pieces 38, 38 are provided at both ends to guide the fixed printed circuit board 4 so that it does not shift laterally.

The spring piece 35 is provided in a “dog” shape with a bent portion protruding outward, and is pressed against the inner side surface 16 of the housing (the pressing protrusion 19 in this embodiment) when attached to the bottom opening 12. Then, the bottom plate 3 is held in the housing 1. Furthermore, lower support claws 33 and upper support claws 34 for supporting and fixing the printed circuit board 4 are provided on both sides in the width direction of the side portion 32, and the printed circuit board 4 is placed on the vertically bent lower support claws 33. , the upper support claw 34 is bent and clamped and fixed. here,
The upper support claw 34 also functions as a ground terminal by being brought into pressure contact with a ground end provided at a corresponding position on the printed circuit board 4. However, the ground terminal is not limited to this, for example, the guide piece 3
8. This can also be realized by bending the tip of the slip-off prevention piece 36 and bringing it into contact with the ground end of the printed circuit board 4.

The support position (height) of the printed circuit board 4 by the lower support claws 33 is set so that when the bottom plate 3 is installed in the housing 1, the input/output end of the circuit board 4 comes into contact with the input/output terminal 15. Then input/output terminal 15
It is convenient to be able to directly solder the input and output terminals.

The printed circuit board 4 has a wiring pattern 41 for connecting electronic circuit components (not shown) to be mounted on a board having substantially the same planar shape as the bottom plate 3, and also has an input/output end 42 and a ground end 43. It consists of The input/output terminal 42 is provided at a position corresponding to the input/output terminal 15 protruding from the inner surface of the casing 1. Further, the ground end 43 is provided at a portion of the bottom plate 3 that functions as a ground terminal, for example, at the position of the upper support claw 34 and the slip-off prevention piece 36 in this embodiment. Also, one end of the printed circuit board 4 is attached to a printed circuit board guide 17 of the housing 1 when it is attached to the housing 1.
A notch 44 is provided that engages with the connector to align the insertion direction and prevent incorrect insertion.

Next, the assembly of the device of the above embodiment will be explained with reference to the above figures along with the function of each part.

First, the printed circuit board 4 is fixed to the bottom plate 3.
For fixing, place the printed circuit board 4 on the lower support claw 33 with the mounting surface of the electronic circuit components facing down, and then,
This is done by bending the upper support claw 34 and the falling-off prevention piece 36 to hold the substrate 4 between them. At this time, the upper support claw 34 and the falling-off prevention piece 36 are brought into pressure contact with the ground end 43 to electrically connect. In addition, the upper support melon 34, the falling-off prevention piece 36, and the ground end 43
It is desirable to solder the

The bottom plate 3 with the printed circuit board 4 fixed thereon is inserted into the bottom opening 12 of the housing 1 with the printed circuit board 4 facing up.
Attach to. Attachment is performed by press-fitting the bottom plate 3 into the housing 1. That is, when the bottom plate 3 is inserted into the housing 1, in the case of this embodiment, the bent portion of the spring piece 35 comes into pressure contact with the pressing protrusion 19 provided on the inner surface 16, and the bottom plate 3 is inserted into the housing 1. keep it inside. Then, the bottom plate 3 is prevented from coming off by raising the cut and raised portion 37 of the falling-off prevention piece 36. Note that by setting the upper end of the spring piece 35 to come into contact with the side of the printed circuit board 4 when the housing 1 is inserted, the spring pressure can be increased and the contact force with the housing 1 can be strengthened. .

After this, the input/output terminal 1 protrudes inside the housing 1.
5 and the input/output end 42 of the printed circuit board 4 are soldered. The connection between the ground end 43 and the casing 1 is made by connecting the ground end 43 to the upper support claw 34 and the falling-off prevention piece 36.
This is done by the contact between the spring piece 35 and the pressing protrusion 19. Therefore, the earth connection can be made without requiring laborious work such as screw fixing as in the conventional case.

Finally, the top plate 2 is press-fitted into the top opening 11 of the housing 1. Installation is done through the opening 11 of the spring piece 22.
This is done by placing the upper plate 2 between the upper plate guides 18, 18 and pressing the upper plate 2. in this case,
The circumferential side surface 21, particularly the spring pieces 22 and 23, are held in the housing 1 by being in pressure contact with the tapered inner wall of the upper opening 11.

In the above embodiment, the housing 1 and the bottom plate 3 are brought into pressure contact mainly by the pressure contact between the spring piece 35 and the pressing protrusion 19.
The side portion 32 may be brought into pressure contact with the pressing protrusion 19 or the inner surface 16, or the spring piece 35 may be directly pressed against the inner surface 16.
It is also possible to have a structure in which it is brought into pressure contact with 6.

Further, in the above embodiment, the upper opening 11 is tapered and the upper plate 2 is held in pressure contact with the upper opening 11, but the present invention is not limited to this. For example, a structure may be adopted in which a locking pawl is provided and held.

Furthermore, although the above embodiments show the case where the present invention is applied to a mixer/brancher, the present invention can be applied to cable television broadcasting equipment having a branching device, a distributor, and other similar structures.

As explained above, the present invention has an opening at the top and bottom of the casing 1, and a bottom plate to which a printed circuit board is mechanically and electrically attached is attached to the bottom opening. It is possible to fix the printed circuit board and the casing and to connect the ground end of the printed circuit board and the casing without using it, making it possible to reduce the space at the ground end, making it easier to downsize the printed circuit board, and when assembling. Since there is no time-consuming screw fixing work, it has the effect of greatly improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the cable television broadcasting equipment of the present invention with the top plate removed;
Figure 2 shows A with the top plate of the above embodiment installed.
-A sectional view, FIG. 3 is a perspective view showing an example of the casing constituting the above embodiment, FIG. 4 is a perspective view showing an example of the top plate constituting the above embodiment, and FIG. 5 is a perspective view showing an example of the top plate constituting the above embodiment. FIGS. 6 and 7 are side views of the bottom plate in the longitudinal and width directions. DESCRIPTION OF SYMBOLS 1...Housing, 11...Top opening, 12...Bottom opening, 13...Side surface, 14...Male spiral tube, 15
... Input/output terminal, 16 ... Inner surface, 19 ... Pressing projection, 2 ... Top plate, 21 ... Circumferential surface, 22,2
3... Spring piece, 3... Bottom plate, 32... Side part, 3
3... Lower support claw, 34... Upper support claw, 36...
... Spring piece, 36 ... Fallout prevention piece, 37 ... Cut and raise, 38 ... Guide piece, 4 ... Printed circuit board, 4
1... Wiring pattern, 42... Input/output terminal, 43...
...Earth end, 44...Notch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A printed circuit board on which circuit components are mounted is installed in a casing with input/output terminals provided on the side, and the input/output terminals of the printed circuit board are connected to the input/output terminals of the casing. In cable television broadcasting equipment, which connects the ground end of the printed circuit board and the casing, the top and bottom surfaces are opened to form the casing, and the top and bottom plates are provided to cover the openings. Each face plate is provided separately, a printed circuit board is mechanically fixed to the bottom plate, and the ground end of the board is electrically connected. 1. A cable television broadcasting device, characterized in that it is mounted by sliding pressure contact on a side surface, and the top plate is mounted in an opening at the top of the casing. (2) The cable television broadcasting device according to item 1 above, wherein a plurality of spring pieces are formed on the sides of the bottom plate, and the bottom plate is attached to the casing by pressing the spring pieces against the inner side of the casing. device.