JPH08186401A - Casing for high frequency signal transmission - Google Patents

Abstract

PURPOSE: To prevent the leak of a high frequency signal or the coupling of transmission lines at the casing to be used for transmitting the high frequency signal. CONSTITUTION: At a casing 1 whose one face is opened, a conductive rubber member 4 is integrated between the bottom surface of a partition plate 3 and the casing 1 and fixed onto the casing 1 by a screw 5. Further, projecting structure is provided at a contact part between the inside of a cover 2 and the upper surface of the partition plate 3. Thus, when the cover 2 is fixed on the casing 1, a projecting part 2a presses the partition plate 3 and shrinks the conductive rubber member 4 with pressure. Therefore, the partition plate 3 is pressed onto the cover 2 by the elasticity of the conductive rubber member 4 and tight adhesion can be kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for high frequency signal transmission, and more particularly to a housing for a microwave transmission device of 1 GHz or higher.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a housing used for transmitting a microwave signal has a partition wall integrally formed with a housing 1 ', an upper surface of a wall around the housing and a cover. The cover 2'has a structure to be screwed to the housing 1 '.

Another conventional example is shown in FIGS. 5 (a) and 5 (b). In this example, grounding tongues 12a and 12b elastically abutting on the upper surface of the shield partition plate 18b and the shield cover 10 are provided (for example, Japanese Utility Model Laid-Open No. 3-25295). In this example, the contact between the shield cover 10 and the shield partition plate 18b is ensured by the grounding tongues 12a and 12b.

Still another conventional example is shown in FIGS. 6 (a) and 6 (b). In this example, the casing 21 having the partition wall 22 and the connecting portion into which the upper portion of the partition wall is fitted are provided, and the shield plate 25 fitted to the opening surface of the housing 1 is in contact with the partition wall 22. It is composed of a rod-shaped elastic body 27 provided on the shield plate and a lid body 26 that presses the shield plate 25 against the partition wall 22 via the rod-shaped elastic body 27 (for example, actual fair 2-7).
No. 508). In this example, the shield 26 is made to pass through the rod-shaped elastic body 27 by bringing the lid 26 into close contact with the housing 21.
Is closely attached to the partition wall 22.

[0005]

However, in the conventional case, for example, the example shown in FIG. 4, the height of the wall around the case is higher than the height of the partition wall by the thickness of the conductive rubber material. However, there is a problem that the reproducibility is poor such that the cover warps when the cover is screwed, the electric characteristics become unstable, and the characteristics change depending on how the cover is closed.

Further, in the example shown in FIG. 5, the contact portion between the grounding tongue and the shield partition plate needs to have a certain area or more, which limits the miniaturization of the device or the high frequency of the transmission signal. In addition, there is a problem that a high frequency signal leaks from the gap in the microwave band because the shield cover and the shield partition plate are not in close contact with each other.

Further, in the example shown in FIG. 6, the height dimension of the partition wall integrally formed with the housing, the bending dimension and thickness of the shield plate, the flatness of the lid body or the diameter of the rod-shaped elastic body are set. There is a problem that it needs to be strictly managed, is structurally complicated, and has a shield plate inside, which hinders miniaturization.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, the object of the present invention is to provide a novel high-frequency signal transmission capable of solving the above-mentioned problems inherent in the conventional technology. It is to provide a housing.

[0009]

In order to achieve the above object, a high-frequency signal transmission case according to the present invention is provided with a partition wall having a structure different from that of the case, and between the bottom surface of the partition wall and the case. Cover provided with a conductive rubber material, a screw for fixing the partition wall to the housing without losing elasticity of the conductive rubber material, and a convex portion formed so as to closely adhere to the upper portion of the partition wall. And is configured.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be specifically described with reference to the drawings for each of its preferred embodiments.

FIG. 1A is a partial sectional perspective view showing a first embodiment of a high-frequency signal transmission casing according to the present invention. 1B is a sectional view taken along the line bb 'of FIG. 1A and seen in the direction of the arrow, and FIG. 1C is the line cc' of FIG. 1A. It is sectional drawing cut | disconnected along and seen in the direction of the arrow.

Referring to FIG. 1 (a), the first embodiment according to the present invention has a partition plate 3 having an appropriate width for a signal wavelength to be transmitted, on a housing 1 having an opening on one side. Then, a conductive rubber material 4 such as comelix is laid on the bottom surface of the partition plate 3, and the partition plate 3 and the conductive rubber material 4 are integrally fixed to the housing 1 with screws 5 (see FIG. 1C). There is.

In order to prevent the head of the screw 5 from protruding from the upper surface of the partition plate 3, a recess (counterbore) 3a is provided in the upper portion of the partition plate 3 into which the screw 5 is inserted. When fixing with the screw 5, the strength of tightening the screw 5 is adjusted so that the elasticity of the conductive rubber material 4 is not lost.

The high frequency transmission line is formed on a dielectric substrate 7, 7'such as an alumina substrate or a Teflon glass substrate soldered on the subcarriers 6, 6 ', and the housing 1
It is arranged in each room formed by the partition plate 3 and the conductive rubber material 4. Furthermore, the cover 2 covers the housing 1.
Is provided.

A convex portion 2a having a convex shape is formed at a portion where the inside of the cover 2 and the partition plate 3 are in contact with each other so as to ensure the contact.

With the above structure, when the cover 2 is screwed to the housing 1, the convex portion 2a of the cover pushes the partition plate 3 and the conductive rubber material 4 contracts. Therefore, the conductive rubber material 4
The partition plate 3 can be brought into close contact with the cover by the elastic force of.

FIG. 2 is a perspective view showing a second embodiment according to the present invention.

Referring to FIG. 2, in the second embodiment according to the present invention, convex portions 2b and 2b each having a step portion 2b 'are formed on the lower portions of both end faces of the cover 2,
The conductive rubber material 8 is fitted in the void formed by the step portion 2b 'and the step portion 1a provided correspondingly on the upper portion of the housing 1. According to this structure, the adhesion between the housing 1 and the cover 2 is further increased.

In addition to the second embodiment according to the present invention,
It is also possible to interpose a conductive rubber material in contact with the convex portion 2a at a position corresponding to the convex portion 2a of the cover 2 on the upper part of the partition plate 3.

FIG. 3 is a sectional view of the essential parts showing a third embodiment of the present invention.

Referring to FIG. 3, FIG. 3 is a sectional view similar to FIG. 1 (c) taken along the longitudinal direction of the partition plate 3, and has a length corresponding to the lower portion of the partition plate 3 of the housing 1. A groove 9 is cut at a position in the direction, and the conductive rubber material 4 is inserted in the groove 9.
Are fitted. When the conductive rubber material 4 is embedded so that the connecting surface between the conductive rubber material 4 and the partition plate 3 is recessed in the groove 9, the adhesion is further improved.

As in any of the above-mentioned embodiments, it is possible to fill the connecting portion of each constituent element with, for example, an adhesive, a gasket or the like, and by doing so, the adhesion between the respective elements is further improved. It will be good.

[0023]

As described above, according to the case of the present invention, unlike the past conventional examples, the partition wall is not integrated with the case, but is floated by the conductive rubber material in the height direction. With the movable structure, the partition plate and the cover can be brought into close contact with each other without requiring strict dimensional accuracy as in the past conventional example shown in FIG.

According to the present invention, even if the partition plate is movable, a conductive rubber material is provided between the partition plate and the case, and the partition plate is brought into close contact with the entire surface of the cover. In contrast, since there is no gap, high frequency signals will not leak.

Furthermore, according to the present invention, even if the cover or the housing is warped or distorted, if the partition plate is movable, it is possible to bring the cover and the partition plate into close contact with each other. Since no elastic body is attached to the cover, it is possible to obtain an effect that it is possible to sufficiently cope with miniaturization.

[Brief description of drawings]

1 shows a first embodiment according to the present invention, (a) is a partial sectional perspective view, (b) is a front sectional view, and (c) is a lateral sectional view.

FIG. 2 is a partial sectional perspective view showing a second embodiment according to the present invention.

FIG. 3 is a cross sectional view showing a third embodiment according to the present invention.

FIG. 4 is a front sectional view showing a first conventional example.

5A and 5B show a second conventional example, FIG. 5A is a plan view, and FIG.
Is a sectional view.

6A and 6B show a third conventional example, in which FIG. 6A is a perspective view and FIG.
Is a sectional view.

[Explanation of symbols]

 1, 1 '... Casing 2, 2' ... Cover 2a, 2b ... Convex part 3 ... Partition plate 3a ... Recessed part 4, 4 ', 8 ... Conductive rubber material 5 ... Screws 6, 6' ... Sub carrier 7, 7 ′ ... Dielectric substrate 9 ... Groove 10 ... Shield cover 12a, 12b ... A pair of grounding tongue pieces 18 ... Shield partition plates 18a, 18b ... Partition plate end face 21 ... Housing 22 ... Partition wall 23, 24 ... Printed circuit board 25 ... Shield plate 25a, 25b ... Shield plate U-shaped portion 26 ... Lid body 26a, 26b ... Lid-shaped U-shaped portion 27 ... Rod-shaped elastic body

Claims (7)

[Claims] 1. A housing having a high-frequency circuit inside, one surface of which is open, a partition plate provided between the high-frequency circuits, a bottom surface of the partition plate, and the housing in a region facing the bottom surface. A case for high-frequency signal transmission, comprising: a conductive rubber material provided; and a cover that covers an upper part of the case. 2. The high frequency signal transmission housing according to claim 1, further comprising a convex portion formed on a contact portion of the cover with the upper surface of the partition plate. 3. The high frequency signal transmission housing according to claim 1, further comprising a conductive rubber material provided at a contact portion between the cover and the upper surface of the partition plate. 4. A projection is formed at a contact portion of the cover with upper surfaces of both sides of the housing.
The high-frequency signal transmission housing according to. 5. The high frequency wave according to claim 4, further comprising conductive rubber provided between each of the convex portions of the cover and each of the contact portions on the upper surface of the partition plate and the casing. Signal transmission housing. 6. The method according to claim 6, further comprising: forming a groove between the high frequency circuits of the casing, embedding the conductive rubber in the groove, and mounting the partition plate on the conductive rubber. Claim 1
The high-frequency signal transmission housing according to. 7. The housing for high frequency signal transmission according to claim 6, further comprising a connection portion between the conductive rubber and the partition plate embedded in the housing.