JPH0621279Y2 - Temporary fixing structure of shield plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a temporary fixing structure of a shield plate which constitutes a casing of a high frequency device such as a CATV tuner.

(Prior Art) In a high-frequency device such as a CATV tuner, a housing for housing circuit components is configured by combining several shield plates. FIG. 4 is an external perspective view of the housing, and the housing 2 shown in FIG.
A combination of three shield plates 4 to 28, shield plates 4 to 18, shield plates 20 to 2
6 and the shield plate 28 have a three-piece structure.

Although the respective shield plates are finally joined to each other by the solder dip, the respective shield plates are temporarily fixed to each other before the solder dip for the joining. An example of this temporary fixing structure will be described with reference to FIG. 5A. That is, at the upper end of the first shield plate A, the positioning slit 30 having a predetermined slit length is formed downward from the upper end, and the positioning slit 30 can be inserted into the side end surface of the second shield plate B. The second shield plate B with the first insertion claw 32 being formed and the plates A and B being arranged such that the insertion claw 32 is located directly above the positioning slit 30 thereof. The insertion claw 32 is inserted into the positioning slit 30 while descending toward the shield plate A.
After this insertion, the wedge-shaped acute-angled forks 36a, 3
While pressing the split caulking 36 having 6a against the upper end surface of the first shield plate A in the positioning slit 30 in which the insertion claw 32 is inserted, the cuts 38, 38 as shown in the drawing are thereby formed. Pressing portions 40, 4 formed on both sides of the positioning slit 30
By pressing the positioning slit 30 from both sides at 0, the insertion claw 32 is clamped and fixed in the positioning slit 30, and the second shield plate B is temporarily fixed to the first shield plate A. I'm trying to fix it.

(Problems to be solved by the invention) In the above-described conventional temporary fixing structure, a large impact is applied to the shield plate at the time of split caulking, and the shield plate is deformed. There is a problem that the printed wiring board on which the circuit components are arranged cannot be inserted from above the body.

Therefore, in order to prevent such a large impact from being applied, for example, as shown in FIG. 5B, the first shield plate A
After inserting the insertion claw 32 of the second shield plate B into the positioning slit 30, the large-sized notch 42 as shown in the drawing is formed on the upper end surface of the first shield plate A next to the positioning slit 30. Although it is possible to reduce the impact by using the split caulking, there is a problem that the shield performance of the housing 2 is significantly deteriorated due to the large notch 42.

Further, in any of the conventional structures described above, since the split caulking is used, it is difficult to make the pressing and holding force of the shield plate constant due to the notch formed by the split caulking, and therefore the first shield plate is Second
The shield plate may be temporarily fixed so as to float up, and this also causes a problem that the shield performance is deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably perform temporary fixing without impact on the shield plate and without lowering the shield performance. There is.

(Means for Solving the Problems) In order to achieve such an object, in the shield plate temporary fixing structure of the present invention, the first shield plate is provided with a predetermined depth downward from the upper end surface of the upper end surface of the first shield plate. By forming a first positioning slit having a predetermined slit length in a vertical position and in a direction parallel or substantially parallel to the upper end surface thereof, between the upper end of the first shield plate and the first positioning slit. In addition to forming a retaining portion, the retaining portion is pressed in one direction with respect to the surface of the first shield plate to be curved, and in the lower side of the first positioning slit in the first shield plate. On the peripheral surface, a second positioning slit having a predetermined slit length is formed downward from the inner peripheral surface,
For insertion on the side end surface of the second shield plate, which has a length that can be inserted into the second positioning slit and is the sum of the slit width of the first positioning slit and the slit length of the second positioning slit. The second positioning slit while lowering the second shield plate toward the first shield plate in a state where a pawl is formed and the insertion pawl is positioned directly above the second positioning slit. The insertion claw is inserted into the inside of the second positioning slit, and the removal prevention part is provided on the first shield plate so that the removal prevention part is located on the insertion claw inserted into the second positioning slit. The second shield plate by pushing it back in the other direction with respect to the surface.
It is characterized by being temporarily fixed to the shield plate of.

(Operation) With the insertion claw of the second shield plate being positioned directly above the second positioning slit of the first shield plate, the second shield plate is lowered toward the first shield plate. Thus, the insertion claw is inserted into the second positioning slit. And the first
On the insertion claw of the second shield plate inserted in the second positioning slit of the shield plate of
The retaining portion of the shield plate is pushed back in the other direction with respect to the surface of the first shield plate so that the retaining portion of the shield plate is positioned. As a result, the insertion claw of the second shield plate is positioned by the second positioning slit of the first shield plate, and is also prevented from coming out upward by the retaining portion of the first shield plate. Will be. In this way, the second shield plate is temporarily fixed to the first shield plate.

Therefore, according to this temporary fixing structure, since the temporary fixing can be performed without using the split caulking, the deformation of the shield plate due to the temporary fixing can be eliminated, and as a result, the printed wiring board on the shield plate can be prevented. The mountability can be improved. Further, since the insertion claw is inserted in the second positioning slit and the slit width of the first positioning slit can be made small, it is possible to prevent the deterioration of the shield performance as in the conventional case. it can. Furthermore, since the retaining portion is surely positioned on the insertion claw, the second shield plate can be temporarily fixed without being lifted from the first shield plate. Can be prevented.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings. The present invention will be described by being applied to a temporary fixing structure of a shield plate which constitutes a casing of a high frequency device such as a CATV tuner. 1 to 3 are views partially showing only the temporary fixing structure of the shield plate according to the embodiment of the present invention among the respective shield plates constituting the casing, and FIG. FIG. 2 shows a state in which the second shield plate is arranged immediately above the first shield plate, and FIG. 2 shows the insertion claw of the second shield plate inserted into the second positioning slit of the first shield plate. State, third
The figure is a view showing a state in which the retaining portion of the first shield plate is pushed back from the inserted state.

Hereinafter, a temporary fixing structure of a shield plate according to an embodiment of the present invention will be described.

In the first shield plate A in this embodiment, a predetermined slit length is provided on the upper end 50 at a predetermined depth position downward from the upper end surface 52 and in a direction parallel or substantially parallel to the upper end surface 52. First positioning slit 5 having
4 are formed. The first shield plate A also has a retaining portion 56 formed between the upper end surface 52 and the first positioning slit 54. The retaining portion 56 is pressed in one direction (direction of arrow 60 in the drawing) with respect to the surface 58 of the first shield plate A, and is curved by press molding or the like. Further, on the lower inner peripheral surface of the first positioning slit 54 in the first shield plate A, a second positioning slit 62 having a predetermined slit length downward from the inner peripheral surface is formed.

In the second shield plate B of this embodiment, the side end surface 64 of the second shield plate B can be inserted into the second positioning slit 62 of the first shield plate A and the first positioning slit 54.
The insertion claw 66 having a length that is the sum of the slit width and the slit length of the second positioning slit 62 is formed.

In the temporary fixing structure of the present embodiment having the above structure, as shown in FIG. 1, for inserting the second shield plate B directly above the second positioning slit 62 of the first shield plate A. Position the claw 66. In this state, by lowering the second shield plate B toward the first shield plate A, as shown in FIG. 2, the second shield plate A is moved into the second positioning slit 62 of the first shield plate A. The insertion claw 66 of the second shield plate B is inserted.
Then, the retaining portion 56 of the first shield plate A is positioned on the insertion claw 66 of the second shield plate B inserted into the second positioning slit 62 of the first shield plate A. Then, the retaining portion 56 is pushed back in the direction of arrow 68 in the figure. As a result, the second shield plate B is temporarily fixed to the first shield plate A as shown in FIG.

(Effect) As is apparent from the above description, according to the present invention,
It has become possible to provide a temporary fixing structure for a shield plate that can reliably perform temporary fixing without impact on the shield plate and without lowering the shield performance.

[Brief description of drawings]

1 to 3 relate to an embodiment of the present invention, FIG. 1 shows a state in which a second shield plate is arranged directly above a first shield plate, and FIG. 2 shows a first shield plate. FIG. 3 shows a state in which the insertion claw of the second shield plate is inserted into the second positioning slit of FIG. 3, and FIG. 3 is a diagram showing a state in which the retaining portion of the first shield plate is pushed back from the inserted state. is there. FIG. 4 is a view showing a housing of a CATV tuner, and FIGS. 5A and 5B are views showing a temporary fixing structure of a shield plate of a conventional example. A ... 1st shield plate, B ... 2nd shield plate, 50 ... 1st shield plate upper end, 52 ... 1st shield plate upper end surface, 54 ... 1st positioning slit, 56 ... Retaining part , 62 ... Second positioning slits, 66 ... Inserting claws.

Claims (1)

[Scope of utility model registration request] 1. A first positioning slit having a predetermined slit length at a predetermined depth position downward from the upper end surface of the first shield plate and in a direction parallel or substantially parallel to the upper end surface. By forming a retaining portion between the upper end of the first shield plate and the first positioning slit, and the retaining portion in one direction with respect to the surface of the first shield plate. And bend to form a second positioning slit having a predetermined slit length downward from the inner circumferential surface of the first positioning slit of the first shield plate. , A second end of the second shield plate, which is insertable into the second positioning slit and has a slit width of the first positioning slit and the second positioning. With the insertion claw having a length that matches the slit length of the lit formed, and with the insertion claw positioned immediately above the second positioning slit, the second shield plate is attached to the first shield plate. The insertion claw is inserted into the second positioning slit while descending toward the shield plate, and the retaining portion is located on the insertion claw inserted into the second positioning slit. The shield plate is temporarily fixed to the first shield plate by pushing back the retaining portion in the other direction with respect to the surface of the first shield plate as described above. Fixed structure.