MXPA97006057A - Protection box for high frequency equipment - Google Patents

Abstract

The present invention relates to a protection box for high frequency equipment comprising: a frame for housing a circuit card, the frame having an interior space that is divided ia plurality of cameras by one or more partition plates, at least one of the dividing plates having an upper edge including an extension, a metal cover mounted on an opening of the frame, wherein the cover includes a hole and a plurality of lower hooks and upper hooks alternately disposed around the hole, each of the lower hooks and upper hooks having a free end facing the hole, said edges extending from the free end and a base end connected to the cover, wherein the free ends of the upper hooks are located above the free ends of the lower hooks, and the side edges of the lower hooks, and where the ends Ibs of the lower hooks are bent towards the free ends of the upper hooks by the extension in such a way that the free ends of the lower hooks make contact with the free ends of the upper hooks

Description

PROTECTION BOX PflRfl HIGH FREQUENCY EQUIPMENT BACKGROUND OF INVENTION 5 GROUP E Lfl INVENTION The present invention relates to a protective enclosure for high frequency equipment, and particularly ee G refers to a ground connection configuration between a divider plate, which is mounted within a frame of the protective enclosure, and A cover that covers a bistro opening.

DESCRIPTION OF THE RELATED TECHNIQUE Typically, high frequency equipment that incorporates a local oscillator circuit is electrically protected by dividing the interior of a metal frame using a plurality of dividing plates, and covering an opening of the frame using a metal cover. The protective box thus formed protects the high frequency equipment, and at the same time avoids undesirable side effects such as leakage of local oscillation rods (sera from OSO to others). circuits. Figure 6 is a plan view illustrating the main components of a known protection box, and Figure 7 is a cross-sectional diagram along the line VII-VII in Figure 6. In these figures, a circuit of local oscillation and / or other circuits (not shown) is nontein on a substrate (printed circuit board) I that is housed within a frame 2. The frame 2 is divided into a plurality of chambers by one or more divider plates 3. An upper cover 4 is mounted on an upper opening formed in the frame 2, and a lower cover 5 is mounted on a lower opening of the frame 2. substrate 1 and divider plate 3 are connected by welding 6"Four hooks 7 are formed on the upper cover 4 which are separated by a central hole 8 and grooves in the form of ruz 9 .. During the assembly of the known protection box described above, the cover top 4 is placed on the upper opening of the frame 2 and an extension 3a, which extends from the upper end of the divider plate 3, is received in the hole 8. When the upper cover plate 4 is pressed towards the frame 2, each of the hooks 7 are deformed upwards by extension 3a, connecting so ground the divider plate 3 to the upper cover 4 through the hooks 7. As a result, the local oscillation signal generated by the local oscillation circuit flows into the frame 2 through the divider plate 3 and the cover 4, and consequently, the signal can be inhibited so that it does not flow to other circuits. In accordance with the known protection box described above, when the extension 3a of the divider plate 3 GS recurs in the hole 8 of the upper cover 4, the plurality of hooks 7 come into contact with the upper surface of the a. divider plate 3 »It is + or provides an increased protection effect due to the minimum spaces around the hooks, comparison way, a second known protection box described in Japanese Unexamined Utility Model Publication No. 59- 81088 describes cantilever hooks that are formed by cutting a portion of a roof above, and putting in con + act the aesthetically an upper edge of a divider plate. Another advantage is the aforementioned protection loss is that the conductivity increases between the divider plate 3 and the upper cover 4 because the material The flux adhered to the surface of the divider plate 3 is scraped by the hooks 7, and the extension 3a is inserted through the hole 8 of the upper cover 4. A problem with the known protective casing described above occurs when there is even an light mutual phase shift between the positions of the hole and the extension 3a. When this happens, is not it just more difficult to adjust? the extension 3a through the hole 8, but the reaction force caused by forcibly bending the hooks 7 to fit over the extension 3a is applied to the plate divider 3 in the form of a folding force, and this folding force can cause cracking in the weld 6. Due to these problems occur when the upper plate 4 and the hooks 7 are formed of rigid material of a node which are relatively difficult to bend, it may be possible to reduce the folding effort by reducing the thickness of the upper cover 4 to make each of the hooks 7 easier to bend. However, in such a case, if the upper cover 4 or the frame 2 is subjected to impact when, for example, the protective box is dropped after the upper cover 4 is mounted on the frame 2 , southern and new problem in that each of the hooks 7 can be deformed and detached from the divider plate 3. In such case, the conductivity between the divider plate 3 and the upper cover 4 can not be maintained.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, an object of the present invention is to provide a protective box for high-level equipment. frequency where problems such as those described above are avoided. For this purpose, the present invention is directed to a protection box in which a cover is provided to cover the opening of a frame that houses a substrate (such as a printed circuit board) on which one or more integrated circuits are mounted. The cover includes lower hooks and upper hooks that have free ends that surround the hole, and edges that overlap each other so that no gaps are formed between them through which signals generated by them can escape. integrated circuits. The free ends of the lower hooks 5 engage an extension extending towards it. hole from the edge of a divider plate that divides the frame into a plurality of cameras. When the cover is pressed to the frame, the free ends of the lower hooks are bent upwards and contact a lower surface of the upper hooks. Therefore, providing a two-row construction composed of lower hooks and upper hooks, even if there is a slight mutual offset between the positions of the extension and the hole, this offset is absorbed by the hooks lower easily deformable, thus avoiding cracking in the weld that connects the divider plate to the substrate. In addition, because the deformation of the lower hooks is prevented by the upper hooks after the cover is mounted on the frame, the condition of The contact between the cover and the divider plate is kept in a markedly stable state. The protection box for the high frequency equipment according to the present invention comprises: a protection box for high frequency equipment, including a frame for housing a substrate (a circuit board), and a metal cover mounted on an opening in the frame.The frame has an interior space which is divided into a plurality of chambers by one or more divider plates, and at least one of the divider plates has a top edge which includes a pelengation.The cover includes a hole, and a plurality of lower hooks and upper hooks alternately arranged around the hole. lower and upper hooks has . a free end facing the hole, said edges extending from the free end, and a base end connected to the cover. The free ends of the upper hooks are located above the lower hooks, and the side edges of the upper hooks overlap the side edges of the lower hooks. Finally, the free ends of the lower hooks are bent towards the free ends of the upper hooks by the extension in such a manner that the free ends of the lower hooks contact the free ends of the upper hooks. Although the shape of the lower hooks and upper hooks is not important while the side edges of the upper and lower hooks overlap each other, it is preferable to form the lower hooks and upper hooks in a fan shape because the hooks can be easily overlapped by simply changing the hooks. upper hooks in a radial direction in relation to the. hole, thus simplifying the structure of molds to form the cover. Also, the lower hooks and upper hooks may be of identical configuration and shape, but it is preferable to form the upper hooks so that they have a greater width than the lower hooks to increase the mechanical resistance of the upper hooks, thereby increasing the deformation prevention effects of the upper hooks in relation to the ascending pressure applied by the lower hooks.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view illustrating the main components of the protection box for high frequency equipment in accordance with the present invention; Figure 2 is a cross-sectional view taken along the line II-II in Figure 1; Figure 3 is a plan view of the cover provided for the protection box; Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 3; Figure 5fl and 5B are diagrams to describe the manufacturing process of the aforementioned cover; Figure 6 is a plan view illustrating the main components of a known protection box; and Figure 7 is a cross-sectional view taken along the line of VII-VII in the figure DESCRIPTION OF THE PREFERRED MODE The present invention will now be described with reference to Figures 1-5B. In these figures, the same reference numbers are given to members which are equivalent to those of the known protection box described above shown in figures 6 and 7. The protection box according to the present invention is characterized in that An upper cover 10 is provided with a plurality of upper hooks 11 and lower hooks 12 having mutually overlapping side edges, wherein the lower hooks 12 are bent to contact the lower surface of the upper hooks 11 when the extension portion 3a formed on the upper edge of the divider plate 3 is inserted in the hole provided between the lower tips of the hooks 12 when the cover 10 is mounted on the upper opening of the frame 2. The upper hooks 11 and the lower hooks 12 mentioned above they have a fan shape and have base ends fixed in an alternating pattern around the periphery of a surface c onic 13 formed on the upper cover 10, with base portions of the upper hooks 11 being wider than the base portion of the lower hooks 12.

As shown in Figure 3 and Figure 4, before the upper cover 10 is placed on the frame 2, the free ends of the lower hooks 12 are placed in a position lower than the free ends of the upper hooks 11. , and extend horizontally from the conical surface 13. Subsequently, as indicated by the dashed lines in Figure 3, the side edges of the lower hooks 12 overlap (ie, extend below) the side edges of the hooks superior 1.1.

To manufacture this overlapping arrangement, first, as shown in FIG. 5fl, a concave portion 14 having an inverse conical shape is formed in the upper cover 10,? N hole 15 (diameter di) is formed in the center of the concave portion 14. Next, as shown in the figure 15B, a die and die is shown to form grooves in the concave portion 14 extending from the inclined (angular) portion thereof along the bottom horizontal plane to the hole 15, to separate the upper hooks 11 and the hooks lower 12. Next, the upper hooks 11 are pressed towards the hole 15. Consequently, there is a slight deviation of the upper hooks 11 toward the center of the hole 15, so that while a distance between the free ends of the opposite lower hook 12 remains unchanged in di, the distance between the free ends of the opposite upper hooks 11 becomes d2, and, as described above, the side portion of each of the lower hooks 12 overlaps the side portion of the surrounding upper hook 11. With respect to the assembly of a protective box for equipment of High frequency such as the one described above, the substrate 1, frame 2, and divider plate 3 are first integrated, then the upper cover 10 is placed on an upper edge of the frame 2 to cover the upper opening. As shown in Figures 1 and 2, the extension portion 3a located on the upper edge of the divider plate 3 is received between the tips of the lower hooks 12. This causes the lower hooks 12 to be bent upwards in such a way each of the lower hooks 12 makes contact with the lower surface of the surrounding upper hooks 11. This contact electrically connects the divider plate 3 with the upper cover 10 through the lower hooks 12, and the local oscillation signals. generated by the local oscillation circuit flow through the frame 2 through the divider plate 3 and the upper cover 10, thus inhibiting the signals so that they do not affect other circuits. Even if there is a slight mutual displacement between the hole formed in the upper cover 10 and the frame 2, the extension portion 3a of the dividing plate 3 does not contact the relatively rigid upper hooks 11, but rather is only in contact with the easily deformable lower hooks 12. Therefore, the displacement is absorbed by the easily deformable lower hooks 12. Accordingly, no used folding force is applied to the divider plate 3 of the lower hooks 12, reliably preventing cracking the welding B. Also, 5 even when an impact is applied to the upper cover 10 or to the frame 2, such as when the protective box is dropped after the upper cover 10 is mounted on the upper opening of the frame 2, the lower hooks 12 not $ are easily deformed because they are in contact with the lower surface of the upper hooks 11. Therefore, the lower hooks 12 do not detach from the extension portion 3a of the divider plate 3, and consequently, the conductivity between the divider plate 3 and the upper cover 10 is reliably maintained . In accordance with the above-described embodiment, a plurality of upper hooks 11 and lower hooks 12 are disposed on an upper cover 10 which is mounted on the upper opening of frame 2, this arrangement being of a 2-row construction in Wherein the lateral edges of the upper hooks 11 and the lower hooks 12 overlap, so that even in the case of a slight mutual displacement between the positions of the members when the upper cover 10 is mounted on the frame 2, this displacement is absorbed by the easily deformable lower hooks 12, which are bent with the extension portion 3a of the divider plate 3. Therefore, the force of forced plegainionto is not transmitted to the divider plate 3, thus reliably avoiding cracking of the weld 6. Further, since the deformation of the lower hooks 12 is prevented by the upper hooks 11 after the upper cover-10 is placed on the frame 2, the contact condition between the upper cover 10 and the dividing plate 3 can be maintained- in a markedly stable state. The upper hooks 11 and the lower hooks 12 are preferably fan-shaped, and the upper hooks 1.1. and the lower hooks 12 are relatively changed in the radial direction of the hole 15 using the conical portion 13 as a base, thus forming the upper hooks 1.1 and the lower hooks 12 on the upper cover 10, and facilitating the overlap of the upper hooks 11. and the lower hooks 12, thereby simplifying the mold structure to form the upper cover 10. In addition, the upper hooks 11 are formed to be wider than the lower hooks 12, making the lower hooks 12 more easily deformable, and increasing the relative stiffness of the upper hooks 11, increasing the prevention effects of deformation of the upper hooks 11 in relation to the lower hooks 12. The present invention is implemented by an arrangement such as the above-described embodiment, and It has the above advantages. It will be apparent to those skilled in the art that many changes and modifications can be made without departing from the spirit or scope of the invention as set forth herein.

Claims (4)

NOVELTY OF THE INVENTION CLAIMS

1. - A protective box for high frequency equipment comprising: a frame for housing a circuit card, the frame having an interior space that is divided into a plurality of cameras by one or more partition plates, at least one of the dividing plates having a 10 upper edge that includes an extension; a metal cover mounted on an opening of the frame; wherein the cover includes a hole and a plurality of lower hooks and upper hooks automatically arranged around the hole, each of the lower hooks and 15 upper hooks extending a free end facing the hole, said edges extending from the free end and a base end connected to the cover, where the free ends of the upper hooks are located above the free ends of the hooks inferiors, and 20 side edges of the upper hooks overlap the side edges of the lower hooks, and wherein the free ends of the lower hooks are bent towards the free ends of the upper hooks by the extension in such a way that the free ends of the lower hooks 25 make contact with the free ends of the upper hooks.

2. - The protection box according to claim 1, further characterized in that the lower hooks and the upper hooks are configured in such a way that the base end of each of the lower and upper hooks is wider than the free end of each hook. one of the lower and upper hooks.

3. The protection box according to claim 1, further characterized in that the base ends of the upper hooks are wider than the base ends 10 of the lower hooks.

4. The protection box according to claim 1, further characterized in that the cover is a metal plate that defines a first plane, the base end of each of the lower and upper hooks extends in the first angle relative to the foreground, and the free end of each of the lower and upper hooks extends at a second angle relative to the base end of each of said lower and upper hooks.