JPH08125374A - Case body internally having partition plate - Google Patents

Abstract

PURPOSE: To provide the title case body fit for small-quantity-production capable of notably cutting down the assembling manhours of a metallic case body containing a high-frequency circuit, etc. CONSTITUTION: Linear notches 2 are formed by full etching step on specific positions of one metallic plate 1 from both surfaces thereof. Thus, frame plates 3a, 3d comprising the peripheral surfaces of a case body and plural numbers of partition plates partitioning the inside of the case body are formed simultaneously forming linear trenches on the specific positions of connecting plate parts 9 connecting the frame plates 3a-3d and the partition plates by half etching step so that the whole frame plates 3a-3d and the shield plates 3e-3g may be assembled and coupled in the unseparated state by folding them in crest or valley type along these trenches.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal casing having a partition plate as a shield plate therein, which is used for high frequency equipment such as a tuner.

[0002]

2. Description of the Related Art A housing used for housing a high-frequency circuit, such as a housing for a tuner or the like, secures electromagnetic shielding for each functional circuit and also secures the mechanical strength of the housing itself. To secure it, the inside is divided by a shield plate.

The conventional housing of this type of tuner is disclosed in, for example, Japanese Utility Model Laid-Open No. 53-134611 and Japanese Utility Model Laid-Open No. 55-1129.
As disclosed in Japanese Patent No. 25, etc., the frame body and the shield plate that make up the tuner housing are separately formed by press working,
In the assembling process, it is common to adopt a configuration in which they are integrated by means such as caulking after fitting.

[0004]

As described above, in the conventional housing for high-frequency circuits (tuner housing, etc.), the frame body and the shield plate are formed by pressing, and before the assembly process,
The frame and the plurality of shield plates are separate parts that are independent of each other. For this reason, when the number of shield plates is large, do not mix up the types of shield plates, and
Since it has to be aligned in a correct position, there is a problem that the number of assembling steps is large and complicated.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a housing having a partition plate inside, which can significantly reduce the number of assembling steps of a metal housing for housing a high-frequency circuit etc. and which is suitable for small-volume production.

[0006]

In order to achieve the above-mentioned object, the present invention achieves full etching (equivalent etching rate from the front surface and the back surface of a metal plate) from a predetermined portion of one metal plate by using an etching technique. Is performed, and is mainly defined as etching performed when the metal plate is cut off) to form linear cutouts, whereby a frame plate that constitutes, for example, four outer peripheral side surfaces of the housing and a housing are formed. Forming a plurality of partition plates that partition the inside of the body, and half-etching a predetermined part of the connecting plate part that connects the frame plate and the partition plate It is defined as etching that forms a groove of about half the plate thickness) to form a linear groove, and along this groove a valley fold or mountain fold is made, and all As combined and coupling with no separating plate and the shield plate configured.

[0007]

By providing linear cutouts or grooves in one metal plate by etching, it is possible to divide and form a plurality of frame plates and shield plates in a partially connected state, and also to form linear grooves. By folding along
All frame plates and shield plates can be combined and combined without separation. Therefore, the housing can be assembled simply by bending along the groove, and the number of assembling steps can be significantly reduced. Also, since each plate is automatically aligned by simply bending, the assembling work is easy and reliable. .

[0008]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a plan view showing a state where one metal plate for forming a housing according to one embodiment of the present invention is processed by etching. The shape shown in FIG. 1 is obtained by applying photoresist to both sides of one metal plate, patterning by mask and exposure, then selectively removing the photoresist, etching the metal plate, and then applying the photoresist. Shows the state in which is removed.

In FIG. 1, 1 is a metal plate, 2 is a linear notch forming each plate portion, 3a is a first frame plate, 3b is a second frame plate, 3c is a third frame plate, and 3d. Is the fourth frame plate, 3e
Is a first shield plate, 3f is a second shield plate, 3g is a third shield plate, 4 is an unnecessary metal plate, 5a, 5b, 5
c, 5d, 5e, 5f, 5g, 5h, 5i, 5j are projections for fitting (for engaging), 6a, 6b, 6c, 6d, 6
e, 6f, 6g, 6h, 6i, 6j are square holes for fitting (for engaging), 7 is a linear groove (surface groove) formed on the surface of the part connecting the plate parts, and 8 is each plate A linear groove (rear surface groove) formed on the back surface of the portion connecting the parts, 9 is a connecting portion (connecting plate portion), 10 is a board insertion portion, 11 is a board pattern escape, 1
Reference numeral 2 is a circular hole cutout, and 18 is a connecting plate (connecting plate portion).

The notch 2 is formed by subjecting the metal plate 1 to the above-described full etching, and the frame plate 3a.
3d and the shield plates 3e to 3g are formed, and each frame plate and the shield plate can be partially connected by the connecting portions 9 ... And the connecting plate 18. That is, the notch 2 is formed by performing linear etching from the front surface and the back surface of the metal plate 1 at the same position on both surfaces at the same time and at the same etching speed at the same etching speed and at the same time, with a line width of about the plate thickness of the metal plate 1. The metal plate 1 is formed into a frame plate (frame plate forming four outer peripheral side surfaces of the case) and a shield plate (a partition plate for partitioning the inside of the case) which form the case.

From the front surface or the back surface of the metal plate 1,
The front surface groove 7 and the rear surface groove 8 are formed by performing the linear etching by the half etching described above with a line width of about the plate thickness of the metal plate 1. That is, at the same time as forming the notch 2 in the metal plate 1, etching is performed from either the front surface or the back surface of the metal plate 1 to form a linear shape at a depth of about half the thickness of the metal plate 1. By performing the etching of, in each connecting portion 9 and connecting plate 18,
The front surface groove 7 or the back surface groove 8 is formed at the boundary with the frame plate or the shield plate. As a result, the surface groove 7 is bent along the groove (downward bending perpendicular to the paper surface in FIG. 1) so that the surface groove 7 can be easily and surely bent. Further, the back groove 8 can be formed by performing valley bending (upward bending upward in the direction perpendicular to the paper surface in FIG. 1) along the groove in the back groove 8.
Bending can be performed easily and surely at the boundary.

In this embodiment, the plate 4 which is not necessary to form the housing is completely separated by the notch 2 and separated by the etching process. However, in consideration of workability and the like, the unnecessary plate 4 is not completely separated by etching, but is connected to an adjacent frame plate or shield plate at a minute portion, and is cut and collected after etching is finished. It is also possible.

In this embodiment, after the etching is completed, a metal film such as a solder plating film, which is well compatible with the metal surface, is rust-proof at least on the surface of the groove or cut portion of the metal plate 1 which has been subjected to the etching treatment. Is formed. Of course, after the etching is completed and the photoresist is removed, a metal film such as a solder plating film that is well compatible with the metal surface may be deposited on the entire surface of the metal plate 1.

The connecting portion 9 having a right-angled triangular shape when viewed from a plane is formed by maintaining the connection between the two plate portions that are in contact with the surface groove 7 formed on the two sides sandwiching the right angle. The plate portions can be bent, and each plate portion (frame plate and shield plate) in contact with the surface groove 7 of each connecting portion 9 is bent along the surface groove 7 in an appropriate bending order to form a mountain bend.
It can be bent 0 degrees. Thereby, the frame plates 3a, 3b,
3c, 3d and each projection 5a of the shield plates 3e, 3f,
5b, 5c, 5d, 5g, 5h, 5i, 5j and corresponding square holes 6a, 6b, 6c, 6d, 6g, 6h,
6i and 6j are fitted to each other (engaged) and positioned, and the respective plate portions are combined at right angles to each other.

Shield plate 3g of the shield plates
Before the bending of the first frame plate 3a, only the frame plate 3a
It is bent and combined so that it is orthogonal to That is, first, the shield plate 3 is formed along the rear surface groove 8.
g by 90 degrees in a valley bend with respect to the connecting plate 18,
Next, the connecting plate 18 is folded along the surface groove 7 by 180 degrees mountain fold with respect to the frame plate 3a (by folding in two) to form the protrusion 5e of the shield plate 3g and the square hole 6e of the frame plate 3a. And the shield plate 3g is assembled at a right angle to the first frame plate 3a (at this time, the shield plate 3g faces downward with respect to the horizontal frame plate 3a in FIG. It is in). Then, after that, the frame plate 3a and the shield plate 3f are bent at a right angle, so that the projection 5f of the shield plate 3g and the shield plate 3f are bent.
The square hole 6f will be fitted.

As described above, when it is desired to provide a shield plate in a portion where the shield plate directly connected by the right-angled triangular connecting portion 9 cannot be formed, the surface groove 7 for double folding (for mountain folding) is formed. Connecting plate 1 connected to frame plate 3a at a part
A shield plate for partitioning the inside without cutting other shield plates or frame plates is formed by removing the other shield plate or the frame plate by cutting through so that the shield plate 3g connected by the back surface groove 8 for valley fold is formed. Since the shield plates can be attached to each other, or there is no gap between the shield plates or the contact portion between the shield plates and the frame plate, the structure can be formed. That is, notching the frame plate and the shield plate for removing the plate results in insufficient grounding in a high-frequency circuit and the electromagnetic shielding effect is insufficient. There is no such possibility if the method of planing is used.

The frame plate and the shield plate, which are bent and combined, are caulked at the fitting portions (engaging portions) of the projections and the square holes, or soldered, or both. As a result, the connection is ensured mechanically and electrically. Further, the frame plates, the frame plates and the shield plates, and the contact portions between the shield plates are also reliably connected mechanically and electrically by a conductive metal as necessary.

An insertion hole for a printed circuit board or the like is inserted into the board insertion portion 10 provided on each shield plate 3e, 3f, 3g, and processing such as grounding or soldering for mechanical fixing is performed. The shield plate is provided with a board pattern relief 11 in order to avoid electrical contact with the pattern of the attached printed circuit board or other exposed potential portions.
Care has been taken to prevent unnecessary contact. Further, the round hole notch 12 provided in the frame plate is a notch for mounting an input or output connector, and the round hole may be a polygonal hole.

FIG. 2 is a plan view showing the assembled state of the housing of this embodiment. In FIG. 2, 13 is the housing.
In the assembled state, the frame plates 3a, 3b, 3c, 3d and the shield plates 3e, 3f, 3g respectively have the protrusions 5
a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5
i, 5j and square holes 6a, 6b, 6c, 6d, 6e, 6
Adjacent plate portions in which f, 6g, 6h, 6i, and 6j are fitted to each other and the projections and the square holes are fitted to each other are arranged at right angles to each other.

FIG. 3 is a front view of the housing 13 of FIG.
This figure shows a configuration in which a printed circuit board 14 is arranged in the housing 13. As shown in FIG. 3, the upper surface of the printed circuit board 14 is arranged close to the lower end surface of the shield plate, and the insertion hole of the printed circuit board 14 is inserted into the board insertion portion 10 of the shield plate, so that the printed circuit board 14 and the shield board are shielded. The plate is fixed by soldering or the like.

FIG. 4 schematically shows a cross section of the metal plate 1 in FIG. 1, in which the notch 2, the surface groove 7,
The back surface groove 8 is shown in the same cross section for convenience. In the configuration shown in FIG. 4, the left side of the notch 2 is not separated. In the portion of the surface groove 7 of the metal plate 1, the groove 7
If a mountain bend is applied at the center of the groove and a valley bend is applied at the center of the groove 8 on the back surface groove 8 of the metal plate 1, a cross-sectional structure as schematically shown in FIG. 5 is obtained.

In FIG. 5, reference numeral 15 is a bent portion by mountain bending, and 16 is a bent portion by valley bending. In the present embodiment, after the bending process is performed, the thin-walled portions of the bent portions 15 and 16 (recessed portion by the groove on the surface side where the front surface groove 7 or the back surface groove 8 is formed) are formed as shown in FIG. A metal material 19 such as solder, which is well compatible with the above-mentioned rust-preventing metal film, is filled to increase the mechanical strength of the bent portion. The metallic material 19 is filled so that the bending curves are smoothly continuous. In addition,
Even when the front surface groove 7 and the rear surface groove 8 are not covered with the above-mentioned metal film for rust prevention, the bent portion is similarly filled with a metal material 19 such as solder that is well adapted to the etched metal surface. It In this embodiment, the frame plates 3a, 3b, 3
C, 3d and the shield plates 3e, 3f and the respective bent portions of the connecting portions 9 have the same structure as the bent portion 15 and the metal material 19 of FIG. 5, and the shield plate 3g and the connecting plate 1 are formed.
The bent portion with 8 has the same structure as the bent portion 16 and the metal material 19 in FIG.

In this embodiment, it is necessary to bend the connecting plate 18 by 180 degrees. FIG.
1 schematically shows a cross section of the metal plate 1 in FIG. 1, in which the surface groove 7 for 180-degree mountain bending between the frame plate 3a and the connecting plate 18, and the connecting plate 18 and the shield plate are shown. The back surface groove 8 between 3 g is shown in the same cross section for convenience. When the front surface groove 7 shown in FIG. 6 is subjected to 180-degree mountain bending and the back surface groove 8 is subjected to 90-degree valley bending, a bending structure as schematically shown in FIG. 7 is obtained. In FIG. 7, 17
Is a bent portion with a 180 degree mountain bend, 19
Is the metal material filled in the bent portion.

In the above-mentioned embodiment, the frame plate forms four outer peripheral side surfaces of the housing, but the frame plate has four outer peripheral side faces.
It is also possible to plate the outer peripheral side surface and the bottom surface or the upper surface so as to form five outer peripheral surfaces.

[0025]

As described above, according to the present invention, a plurality of frame plates and a shield plate are partially connected by forming a linear cutout or a groove by etching in one metal plate. It can be divided and formed in a state, and by bending along the linear groove, all frame plates and shield plates can be combined and joined together without being separated.
Therefore, the housing can be assembled simply by bending along the groove, and the number of assembling steps can be significantly reduced. Also, since each plate is automatically aligned by simply bending, the assembling work is easy and reliable. . Further, it is possible to arrange the shield plates that partition the inside of the housing at right angles with each other or with a small gap between the shield plates and the frame plate, and the electromagnetic shielding effect of a high frequency circuit or the like is enhanced.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which one metal plate for forming a housing according to one embodiment of the present invention is processed by etching.

FIG. 2 is a plan view showing a state after assembly of the housing according to the embodiment of the present invention.

FIG. 3 is a front view showing the assembled state of the housing according to the embodiment of the present invention.

FIG. 4 is an explanatory view of one example schematically showing a cross section of a metal plate according to one embodiment of the present invention for convenience of description.

FIG. 5 is an explanatory view schematically showing a cross section of the metal plate of FIG. 4 after being bent.

FIG. 6 is an explanatory view of another example schematically showing a cross section of a metal plate according to one embodiment of the present invention for convenience of description.

FIG. 7 is an explanatory diagram schematically showing a cross section of the metal plate of FIG. 6 after being bent.

[Explanation of reference numerals] 1 metal plate 2 notches 3a, 3b, 3c, 3d frame plate 3e, 3f, 3g shield plate 4 unnecessary metal plates 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5
i, 5j Protrusions 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6
i, 6j Square hole 7 Front surface groove 8 Back surface groove 9 Connecting portion 10 Board insertion portion 11 Board pattern relief 12 Round hole cutout 13 Housing 14 Printed board 15 90 degree crest bend section 16 90 degree valley bend section 17 180 degree Mountain bending part 18 Connecting plate 19 Metal material

Claims (9)

[Claims] 1. A frame plate forming an outer peripheral surface of a casing and a partition plate for partitioning the inside of the casing, which is formed by a notch formed by etching one metal plate. A casing having a partition plate inside, characterized in that all the frame plates and the shield plates are combined and joined in a state where they are not separated by bending along the grooves formed by etching the connecting plate portions to be connected. 2. The metal plate thickness according to claim 1, wherein the notch is formed by etching one metal plate from the front surface and the back surface at the same position on both surfaces at the same time and at the same etching rate. A casing having a partition plate inside, which is formed to have a similar line width. 3. The groove according to claim 1, wherein the groove is formed by etching from the front surface or the back surface of the connecting plate portion to a depth of approximately half the plate thickness of the metal plate. A case with a partition plate inside. 4. The method according to claim 1, wherein at least one of the partition plates is one of the other shield plate or the frame plate, a bent portion of a mountain fold along the groove by etching from the surface, and The connecting plate part connected by the bent part, and the bent part of the valley fold along the groove by etching from the back surface connected with the connecting plate part are connected through the shield plate in sequence. One of the bumps
The shield plate fits into a hole provided in any of the other shield plate or the frame plate that is arranged in close proximity, and another projection provided in the shield plate is arranged in close proximity to the shield plate. A casing having a partition plate inside, which is fitted with a hole provided in another shield plate or frame plate. 5. The housing according to claim 1 or 3, wherein the bent portion is filled with a metal material that is well suited to the etched metal surface. 6. The housing according to claim 1 or 3, wherein the groove formed by etching is coated with a metal film. 7. A housing having a partition plate inside, characterized in that the metal film coated on the bent portion is filled with a metal material that fits well. 8. The surface according to claim 1, wherein surfaces of the frame plates, the frame plates and the partition plates, or a plurality of the connection plate portions connecting the partition plates are flat and in the same plane. A case with a partition plate inside. 9. The frame plate and the partition plate according to claim 1, wherein a projection provided on one frame plate or a shield plate and a hole provided on the other frame plate or the shield plate are fitted to each other. A case with a partition plate inside that is characterized by fitting.