JPH071842Y2 - Filter case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a filter case, and more particularly to a filter case used for accommodating a filter element having a layered structure such as a triplate-type stripline filter.

[Prior art]

An example of the filter case is disclosed in, for example, Japanese Utility Model Publication No. 62-28081 filed on July 18, 1987.

[Problems to be solved by the invention]

Since this conventional filter case has a simple box shape, the XY of the filter element inside the filter case
Positioning in the direction (on the plane) is not always easy,
Further, since it is not assumed that the built-in elements have a layered structure, it is unsuitable for accommodating filter elements having a layered structure to be pressed against each other. That is, when a triplate-type stripline filter is built in a conventional filter case, since the pressure contact force is not sufficient, air with a low dielectric constant is present between the elements of each layer,
As a result, there is a problem that the filter characteristic is deteriorated.

Therefore, the main purpose of this device is to
It is an object of the present invention to provide a filter case that can be easily positioned in the direction and can sufficiently press the built-in filter element.

[Means for solving problems]

According to the invention, a rectangular bottom plate on which an element is placed, a side wall formed by standing up from two opposing side edges of the bottom plate, and an outwardly protruding claw portion formed on each of the side walls. Including a first portion, and a rectangular bottom plate slightly larger than the outer size of the bottom plate of the first portion, and side walls formed by rising from two side edges corresponding to the two side walls of the first portion of the bottom plate, A second portion including a slit formed in each of the side walls thereof is provided, the element is placed on the bottom plate of the first portion, and the first portion and the second portion are integrated to form the claw portion of the first portion of the second portion. The protrusion is formed by being inserted into the slit, and further, the protrusion is formed on the inner surface of the bottom plate of the second portion so as to protrude inward, and the element in which the protrusion is built is pressed against the bottom plate of the first portion. , A filter case.

[Action]

The filter case is completed by fitting the first portion and the second portion with the filter element placed on the bottom plate of the first portion and inserting the claw portion of the first portion into the slit of the second portion. . The protrusion presses the filter element downward from above, that is, toward the bottom plate of the first portion.

[Effect of device]

According to this invention, the bottom plate of the first part is slightly smaller than the bottom plate of the second part, and moreover, the filter case can be constructed only by integrating the first part and the second part and inserting the claws into the slits. The side wall facilitates positioning of the filter element in the case in the XY directions. Further, if the dimensions in the height direction of the side walls of the claw and the slit are appropriately set, the element comes into pressure contact with the projection of the second portion, so that, for example, a filter such as a triplate-type stripline filter is used. Even if the element is used, it is possible to prevent the deterioration of the filter characteristics due to insufficient pressure contact force.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments below with reference to the drawings.

〔Example〕

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
The filter case 10 is a lower case made by press molding a thin metal plate such as copper.
Includes 12 and upper case 14.

The lower case 12 as the first part includes a bottom plate 16 having, for example, a rectangular shape having a size substantially the same as or slightly larger than the outer size of an element (described later) to be mounted thereon. A side wall 18 is vertically formed at one edge of the bottom plate 16 on the short side. A notch 20 having a constant width and communicating with the bottom plate 16 is formed substantially at the center of the side wall 18. Similar side walls 22 and cutouts 24 are also provided on the edge facing the short side edge.
Is formed.

Two claws 26a and 26b are formed at a position sandwiching the notch 20 at the upper edge of the side wall 18 by being bent so as to project outward. In addition, similar claws 28a and 28b are provided on the side wall 22 described above.
Is formed.

Further, at one end on the long side sandwiched between the side walls 18 and 22, a side wall 30 that is integral with the side walls 18 and 22 and higher than them is vertically formed. No side wall is formed on the edge 32 facing the side wall 30.

In this example, the height of the side walls 18 and 22 is
It is chosen to be about half the height of 30 and therefore the nail 26a described above.
~ 28b is also formed at a position approximately half the height of the side wall 30.

The upper case 14 as the second portion includes a ceiling plate 34 that is slightly larger than the outer size of the bottom plate 16 of the lower case 12, for example, a rectangular ceiling plate 34. On the inner surface or the lower surface of the ceiling plate 34, a plurality of projections 36 for press-contacting the built-in element in the direction of the bottom plate 16 of the lower case 12 are formed by, for example, embossing, for example, in a truncated cone shape. These protrusions 36 are formed in an appropriate distribution so that a uniform pressure contact force or pressing force is applied from the entire upper surface of the element.

The protrusion 36 does not necessarily have to be formed by embossing, and may be formed by a cut and raised piece, for example, or may be formed by another member.

Further, at the end of the ceiling plate 34 on the long side corresponding to the side wall 30 of the lower case 12, an engagement for preventing the lower case 12 and the upper case 14 from coming off after they are fitted. For example, a semicircular stopper 38 as a part is formed by boss processing, for example.

The engaging portion or the stopper 38 need not be formed by bossing as in this embodiment, but may be formed by simply bending the edge of the ceiling plate 34.

A side wall 40 is formed so as to hang down (stand up) at one edge on the short side of the ceiling plate 34. On the side wall 40, the lower case 12
Slits where the claws 26a and 26b of the are to be fitted therein
42a and 42b are formed to extend horizontally over a certain length. The one slit 42b communicates with a notch 44 having a constant width formed in the center of the side wall 40. Lower case
When the 12 and the upper case 14 are integrated, the aforementioned claw 26b is first placed in the notch 44 and then inserted into the slit 42b. At a lower end portion of the side wall 40, a ground terminal 46 bent so as to protrude outward is provided at a position sandwiching the notch 44.
a and 46b are formed. In addition, the ground terminal on the side wall 40
Approximately directly above 46a and 46b is a built-in element 64
Holes 48a and 48b for soldering the ground electrode 74 (described later) to the filter case 10, that is, the upper case 14 are formed.

A similar side wall 50 is formed so as to hang down on the other short-side edge of the ceiling plate 34, and has slits 52a and 52b, a cutout 54, and a ground terminal.
56a and 56b, and holes 58a and 58b for soldering are formed.

A side wall 60 is integrally formed with the side walls 40 and 50 and has the same height as the one side edge of the lower case 12 facing the side wall 30 on the long side. Edge 62 opposite side wall 60
No sidewall is formed on the.

The height of the side wall 30 of the lower case 12 and the side wall 4 of the upper case 14
Almost equal to the height of 0, 50 and 60, the slits 42a, 42b,
52a and 52b are formed at positions approximately half the height of the side walls 40 and 50. Thereby, when the lower case 12 and the upper case 14 are integrated, the aforementioned claws 26a, 26b, 28a and 28b respectively correspond to the corresponding slits 42a, 42b, 52a and 52a.
It can fit in b as it is.

The element to be housed in the filter case 10 is, for example, a triplate-type stripline filter 64, the outer size of which is the bottom plate 16 of the lower case 12, that is, the side walls 18, 22 and 3.
It is almost equal to or slightly smaller than the inner size of the inner space formed by 0. Such a triplate-type stripline filter 64 includes a first dielectric substrate 66 and a second dielectric substrate 68 made of a dielectric material such as ceramic, and an insulating material made of resin, for example, between them. Sex sheet
70 is sandwiched. A ground electrode 72 is formed on the upper surface of the first dielectric substrate 66, a resonance electrode (not shown) is formed on the lower surface, and a ground electrode 74 is formed on the lower surface of the second dielectric substrate 68. Further, a resonance electrode (not shown) is formed on the upper surface of the second dielectric substrate 68, and an input / output terminal 76 is connected to the extraction portion of this resonance electrode. Since such a triplate-type stripline filter 64 itself is already known, its detailed description is omitted.

At the time of assembly, first, the tri-plate type stripline filter 64 is placed on the bottom plate 16 of the lower case 12. In that state, as shown in FIG. 2A, the side wall 30 of the lower case 12 and the edge 62 of the upper case 14 correspond to each other, and the edge 32 of the lower case 12 and the side wall 60 of the upper case 14 correspond to each other. Then, the upper case 14 and the lower case 12 are superposed and integrated.

Next, the lower case 12 or the upper case 14 is slid horizontally as shown by the arrow in FIG. 2A. Then, as shown in FIG. 2B, the claw portions 26a, 26b, 28a and 28b of the lower case 12 and the corresponding slits 42a, 42b, 52a and 52b of the upper case 14 are fitted to each other. In that state, for example, by twisting the claws 26a to 28b, temporarily fixing them, and finally soldering,
The filter case 10 is completed.

Thus, the tri-plate type strip line filter 64 housed by the side walls 18 and 22 of the lower case 12 is
Positioning in the XY directions is easily and reliably achieved. Further, as shown in FIG. 3, the stopper 38 of the upper case 14 is engaged with the side wall 30 of the lower case 12, and the side wall 30 and the side wall of the upper case 14 are engaged with each other.
With 60, the shift between the lower case 12 and the upper case 14 in the width direction, that is, the positioning of the filter 64 in the Y direction is easily and reliably achieved.

By appropriately selecting the height of the claws 26a to 28b and the heights of the slits 42a, 42b, 52a and 52b, the pressure contact force with respect to the triplate type stripline filter 64 can be optimally set. Further, as shown in FIG. 3, the upper case
Since the press-contact force is applied from the upper surface of the triplate-type stripline filter 64 by the projection 36 of the ceiling plate 34 of 14, the press-contact or crimping of the triplate-type stripline filter 64 becomes more reliable.

The slit of the upper case may not be horizontal, but may be angled so as to incline upward from the mating side as shown in FIG. By forming in this way, the pressure contact force can be further increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. FIG. 2A is a side view showing a state in which the lower case and the upper case are overlapped and integrated. FIG. 2B is a side view showing a state where the claws of the lower case are fitted in the slits of the upper case. FIG. 3 is a sectional view showing the completed filter case. FIG. 4 is a side view showing a modified example of the slit of the upper case. In the figure, 10 is a filter case, 12 is a lower case, 14 is an upper case, 16 is a bottom plate, 18, 22, 30, 40, 50 and 60 are side walls,
20 and 24 are notches, 26a, 26b, 28a and 28b are claws, 32 and 62 are edges, 34 is a ceiling plate, 36 is a protrusion, 38 is a stopper, 42
a, 42b, 52a and 52b are slits, 44 and 54 are notches, 64
Indicates a triplate-type stripline filter.

Claims (4)

[Scope of utility model registration request] 1. A rectangular bottom plate on which an element is placed, side walls formed by standing up from two opposing side edges of the bottom plate, and outwardly projecting claw portions formed on the respective side walls. And a rectangular bottom plate that is slightly larger than the outer size of the bottom plate of the first part, and is formed by rising from two side edges corresponding to the two side walls of the first part of the bottom plate. A second portion including a side wall that is formed and a slit formed in the side wall, and the element is mounted on the bottom plate of the first portion.
It is configured by integrating the portion and the second portion and inserting the claw portion of the first portion into the slit of the second portion, and further protruding inwardly on the inner surface of the bottom plate of the second portion. A filter case, which forms a protrusion, and presses the element containing the protrusion toward the bottom plate of the first portion. 2. An edge of the first portion which is sandwiched between two side walls to form another side wall and which is sandwiched between two side walls of the second portion and on which the side wall is absent. And a second side wall is formed so as to form another side wall, and the first part and the second part are integrated so that side edges without the side wall are covered by another side wall opposite to each other. The filter case according to claim 1. 3. An engagement portion formed on the edge of the bottom plate of the second portion without the side wall, wherein the engagement portion is formed when the first portion and the second portion are integrated. The filter case according to claim 2, wherein the filter case engages with an upper end of the other side wall of the first portion. 4. A notch communicating with the slit is formed in a side wall of the second portion, whereby the pawl of the first portion is placed in the notch and then the pawl is inserted into the slit. The filter case according to any one of claims 1 to 3, wherein the first part and the second part are slidable as described above.