JP2015088596A - Shield case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain stabilized electric contact when a lid is fitted in a shield case.SOLUTION: A shield case 1 includes a first housing chamber 10 and a second housing chamber 11 in which substrates incorporating circuits are respectively housed. An opening of an upper surface of the first housing chamber 10 is closed by a first lid part 20 and an opening of a rear surface of the second housing chamber 11 is closed by a second lid part 21. The first lid part 20 is press-fitted in the opening of the upper surface of the first housing chamber 10 to be caulked by a caulking part 22. The second lid part 21 is press-fitted in the opening of the rear surface of the second housing chamber 10 to be caulked by a caulking part 23.

Description

  The present invention relates to a shield case suitable for application to a series unit that is installed on an indoor wall surface or the like and supplies a television signal or the like to an indoor television receiver or the like.

  The series unit is generally used by being attached to a box-like box embedded in an indoor wall surface. The series unit is an input coaxial terminal to which a coaxial terminal for output for connecting to an indoor TV receiver or the like with a coaxial cable and a coaxial cable for guiding a signal from an antenna or the like arranged in the interior space of the wall are connected. And a shield case provided with terminals. The shield case incorporates a substrate on which a circuit for outputting a signal input from the input coaxial terminal is output from the output terminal, and a distribution circuit or the like is incorporated in the substrate as necessary.

A configuration of a conventional shield case 100 included in the series unit is shown in FIGS. FIGS. 26A and 26B are a front view and a top view showing the configuration of the conventional shield case 100, and FIG. 27 is a rear view showing the configuration of the conventional shield case 100. FIGS. ) Is a side view showing the configuration of the conventional shield case 100 in a cross-sectional view taken along the line EE, and is an enlarged view of the portion e. FIGS. It is a bottom view and f section enlarged view shown in a figure.
The conventional shield case 100 shown in FIGS. 26 to 29 is made of metal, and has a rectangular parallelepiped first storage chamber 110 that is horizontally long at the top, and a vertically long rectangular parallelepiped second storage chamber 111 that extends from the center to the bottom. And a flat lower front portion 111c is formed on the lower front surface of the second storage chamber 111. The front surface of the first storage chamber 110 is an upper front surface portion 110c, which includes a lower surface and a wall portion 110a that rises from the lower surface, and the upper surface is open. The second storage chamber 111 includes a wall 111a and has a rear surface opened. A first output terminal 125 and a second output terminal 126, which are coaxial terminals, are provided so as to protrude forward from the upper front part 110c and the lower front part 111c in the conventional shield case 100, respectively.

  A pair of engaging portions 110f each having a U-shape are formed on both sides of the upper front portion 110c and the lower front portion 111c of the conventional shield case 100 in the vertical direction. The engaging portion 110f has a rectangular vertically long engaging hole, and a terminal block (not shown) attached to the front surface of the shield case 100 is detachably fixed to the engaging portion 110f. Further, insertion holes 110d having a rectangular cross section with a predetermined depth are formed on both sides of the upper front portion 110c of the first storage chamber 110, and the second storage chamber 111 is the rear surface of the lower front portion 111c. Insertion portions 111e are formed on both sides of the lower part of each. An insertion hole having the same shape as the insertion hole 110d is formed in the insertion portion 111e. Further, an input terminal 124 that is a coaxial terminal is provided so as to protrude downward from the lower surface of the first storage chamber 110. As shown in FIG. 28A, the first storage chamber 110 and the second storage chamber 111 communicate with each other, and the first storage chamber 110 has a first substrate 127a, and the second storage chamber 111 has a second storage. A substrate 127b is incorporated. On the first board 127a and the second board 127b, a distribution circuit that divides the signal input from the input terminal 124 into two, and a signal that is divided into two by the distribution circuit, respectively, is a first output terminal 125 and a second output terminal 126. A circuit is provided for output from. A first lid 120 is fitted to the upper surface of the first storage chamber 110 so as to close the opening, and an opening is formed in the opening on the rear surface of the second storage chamber 111. The second lid 121 is fitted to the rear surface of the second storage chamber 111 so as to be closed.

  The configuration of the first lid 120 is shown in FIG. 30A, 30B, 30C, and 30D are a top view, a side view, a front view, and a rear view showing the configuration of the first lid 120. FIG. As shown in these drawings, the first lid portion 120 made of metal is composed of a flat plate-like main body portion 120a, and the main body portion 120a has an outer shape approximately the same as the size of the opening on the upper surface of the first storage chamber 110. It is made into a shape. That is, a projecting portion 120b having a horizontally long rectangular shape protrudes from the front surface of the main body 120a, and a rear corner is chamfered. The first lid 120 is fitted to the upper surface of the first storage chamber 110, but the upper end of the wall 110a is thinned to form a stepped portion as shown in FIG. When the first lid 120 is press-fitted into the upper surface of the first storage chamber 110, the periphery of the lower surface of the first lid 120 is brought into contact with the stepped portion to form the fitting portion 122.

  Moreover, the structure of the 2nd cover part 121 is shown in FIG. 31A, 31B, and 31C are a front view, a top view, and a side view showing the configuration of the second lid 121. FIG. As shown in these drawings, the second lid 121 made of metal is composed of an elongated rectangular main body 121a, and the main body 121a has substantially the same size as the opening of the rear surface of the second storage chamber 111. It has a vertically long rectangular shape. The second lid 121 is fitted to the rear surface of the second storage chamber 111, but the upper end of the wall 111a is thinned to form a stepped portion as shown in FIG. When the second lid 121 is press-fitted into the rear surface of the second storage chamber 111, the periphery of the lower surface of the second lid 121 comes into contact with the stepped portion to form the fitting portion 123.

JP 2012-89326 A JP-A-10-189161

  In the conventional shield case 100, as described above, the first lid 120 is fitted to the upper surface of the first storage chamber 110 and the second lid 121 is fitted to the rear surface of the second storage chamber 111. The shield case 100 is shielded. The first lid 120 and the second lid 121 are fitted into the first storage chamber 110 and the second storage chamber 111 by press-fitting, but when they are press-fitted, the first lid 120 or the second lid 121 is fitted. There is a problem that a gap is easily formed between the first storage chamber 110 and the opening of the first storage chamber 110 or the second storage chamber 111, the electrical contact becomes unstable, and the shielding effect is lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shield case in which a stable electrical contact can be obtained when a lid is fitted, thereby improving the shield effect.

  A shield case according to the present invention is a shield case including an input terminal, at least one output terminal, and a storage chamber in which a circuit for outputting a signal input from the input terminal is output from the output terminal. A lid portion fitted into the opening of the storage chamber, the lid portion being fitted into the opening so as to close the opening, and a caulking margin formed at an edge of the lid portion Is characterized by being caulked to the edge of the opening.

  In the shield case of the present invention, when the lid is fitted into the opening of the storage chamber, the caulking margin formed at the edge of the lid is crimped to the edge of the opening. Even if it is made into a shape, it is possible to prevent the lid from floating from the opening. As a result, the electrical contact between the lid and the opening is stabilized, and the shielding effect can be improved.

It is the front perspective view and back perspective view which show the structure of the shield case concerning the Example of this invention. It is the perspective view and front view which looked from the back diagonally downward which show the structure of the shield case concerning the Example of this invention. It is the top view and back view which show the structure of the shield case concerning the Example of this invention. It is the side view which shows the structure of the shield case concerning the Example of this invention with an AA sectional view, and the a section enlarged view. It is the bottom view which shows the structure of the shield case concerning the Example of this invention in the BB sectional drawing, and b part enlarged view. It is the front perspective view and back posterior view which show exploded the composition of the shield case concerning the example of the present invention. It is the front perspective view which shows the structure of the 1st cover part in the shield case of the Example of this invention, a back perspective view, a top view, a side view, a front view, and a rear view. It is the front perspective view which shows the structure of the 2nd cover part in the shield case of the Example of this invention, the perspective view seen from back diagonally downward, a front view, a side view, and a top view. In the shield case of the Example of this invention, it is the front perspective view and back perspective view which show the structure which removed the 1st cover part and the 2nd cover part. In the shield case of the Example of this invention, it is the perspective view and front view seen from back diagonally downward which show the structure which removed the 1st cover part and the 2nd cover part. In the shield case of the Example of this invention, it is the upper side figure and rear view which show the structure which removed the 1st cover part and the 2nd cover part. In the shielding case of the Example of this invention, the side view which shows the structure which removed the 1st cover part and the 2nd cover part with CC line sectional drawing, and the c section enlarged view. In the shield case of the Example of this invention, it is the bottom view which shows the structure which removed the 1st cover part and the 2nd cover part by DD line sectional drawing, and the d section enlarged view. It is a figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is another figure which compares and shows the unnecessary radiation electric field strength of the shield case of the Example of this invention, and the conventional shield case. It is the front view and top view which show the structure of the conventional shield case. It is a rear view which shows the structure of the conventional shield case. It is the side view which shows the structure of the conventional shield case in the EE sectional view, and e section enlarged view. It is the side view which shows the structure of the conventional shield case in the FF sectional view, and f section enlarged view. It is a top view, a side view, a front view, and a rear view showing a configuration of a first lid portion in a conventional shield case. It is the front view, top view, and side view which show the structure of the 2nd cover part in the conventional shield case.

The configuration of the shield case 1 of the embodiment of the present invention provided in the series unit is shown in FIGS. FIGS. 1A and 1B are a front perspective view and a rear perspective view showing the configuration of the shield case 1 according to the present invention, and FIGS. 2A and 2B are views of the shield case 1 according to the embodiment of the present invention. FIGS. 3A and 3B are a top view and a rear view showing the configuration of the shield case 1 according to the embodiment of the present invention, respectively. (A) (b) is the side view which shows the structure of the shield case 1 concerning the Example of this invention by the AA sectional view, A part enlarged view, Fig.5 (a) (b) is FIG. FIG. 6B is a bottom view showing the configuration of the shield case 1 according to the embodiment in a cross-sectional view taken along the line B-B, and FIG. 6B is an enlarged view thereof. FIGS. It is the front perspective view which decomposes | disassembles and shows, and a rear perspective view.
The shield case 1 according to the present invention is made of metal, and as shown in FIGS. 1 to 6, a rectangular parallelepiped first storage chamber 10 that is horizontally long at the top, and a vertically long rectangular solid that extends from the center to the bottom. The second storage chamber 11 is configured such that a first lid portion 20 is fitted to the upper surface of the first storage chamber 10 and a second lid portion 21 is fitted to the rear surface of the second storage chamber 11. .

  First, the structure which removed the 1st cover part 20 and the 2nd cover part 21 in the shield case 1 concerning this invention is demonstrated, referring FIG. 9 thru | or FIG. FIGS. 9A and 9B are a front perspective view and a rear perspective view showing a configuration in which the first lid 20 and the second lid 21 are removed from the shield case 1 according to the present invention, and FIG. FIG. 11B is a perspective view and a front view of the shield case 1 according to the present invention, showing a configuration in which the first lid portion 20 and the second lid portion 21 are removed, as viewed obliquely from the rear, and FIGS. 11A and 11B. These are the top view and rear view which show the structure which removed the 1st cover part 20 and the 2nd cover part 21 in the shield case 1 concerning this invention, Fig.12 (a) (b) is the shield case 1 concerning this invention FIG. 13 is a side view showing the configuration in which the first lid portion 20 and the second lid portion 21 are removed in a cross-sectional view taken along the line C-C, and an enlarged view of the c portion, and FIGS. 1, the first lid 20 and the second lid 21 are removed. Bottom view illustrating the configuration in sectional view taken along line D-D, and d enlarged view.

  As shown in these drawings, the shield case 1 according to the present invention from which the first lid portion 20 and the second lid portion 21 are removed is formed by molding a metal. A first rectangular parallelepiped shape having a box shape including an upper front surface portion 10c that is a front surface of the first storage chamber 10, a lower surface, and a wall portion 10a that is erected from the lower surface. A storage chamber 10 is formed at the top. Further, a box-shaped second storage chamber 11 having a vertically long rectangular parallelepiped shape and an open rear surface is formed by a wall portion 11a formed from the center portion to the lower portion. A flat lower front portion 11 c is formed on the lower front surface of the second storage chamber 11. A second cylindrical portion 10e and a third cylindrical portion 11d for constituting a coaxial terminal are provided so as to protrude forward from substantially the central portion of the upper front portion 10c and the lower front portion 11c.

  The upper front surface portion 10c and the lower front surface portion 11c of the shield case 1 according to the present invention, which are engaging portions 10f that are U-shaped on both sides of the second cylindrical portion 10e and on both sides of the third cylindrical portion 11d. Are formed in pairs in the vertical direction. The engagement portion 10f has a rectangular vertically long engagement hole, and a terminal block (not shown) attached to the front surface of the shield case 1 is detachably engaged with the engagement portion 10f. Further, insertion holes 10d having a rectangular cross section with a predetermined depth are formed on both sides of the rear surface of the upper front surface portion 10c, respectively, and are formed on the rear surface of the lower front surface portion 11c and below the second storage chamber 11. Insert portions 11e are formed on both sides. An insertion hole having the same shape as the insertion hole 10d is formed in the insertion portion 11e. The pair of insertion holes 10d has an insertion hole in which a foot of a plate-like attachment member (not shown) for attaching the series unit including the shield case 1 to a wall surface or a box embedded in the wall surface is detachably fitted. The pair of insertion portions 11e is an insertion portion into which the foot portion of the mounting member is detachably fitted. The attachment member is formed with an insertion hole and a screw hole which are long holes used when attaching to a wall surface or a box.

Furthermore, a first cylindrical portion 10b for constituting a coaxial terminal is provided so as to protrude downward from the lower surface of the first storage chamber 10. As shown in FIG. 12A, the back of the first storage chamber 10 and the upper portion of the second storage chamber 11 communicate with each other, and a substrate is attached to the first storage chamber 10 and the second storage chamber 11. A plurality of bosses are erected.
As shown in FIGS. 9A and 12B, the upper end of the wall portion 10a in the first storage chamber 10 is thinned to form a stepped portion, which forms the rear surface of the first storage chamber 10. A rectangular notch 10g is formed at the substantially central edge of the upper end of the wall 10a. Further, as shown in FIGS. 9B and 13B, the end of the wall portion 11 a in the second storage chamber 11 is thinned to form a stepped portion. A rectangular notch 11b is formed at substantially the center of the edge of the wall 11a that forms both side surfaces.

  Next, the structure of the 1st cover part 20 is demonstrated, referring FIG. 7A, 7 </ b> B, 7 </ b> C, 7 </ b> D, 7 </ b> E, and 7 </ b> F are a front perspective view, a rear perspective view, a top view, a side view, a front view, and a rear view showing the configuration of the first lid 20. is there. The first lid portion 20 is formed by processing a metal plate. As shown in these drawings, the first lid portion 20 is composed of a flat body portion 20a. The main body 20 a has an outer shape that is approximately the same size as the opening on the upper surface of the first storage chamber 10. That is, a projecting portion 20b having a horizontally long rectangular shape protrudes from the front edge of the main body portion 20a, and a rear corner portion is chamfered. In addition, a small rectangular protrusion 20c is formed as a caulking margin substantially at the center of the rear edge.

  Moreover, the structure of the 2nd cover part 21 is shown in FIG. 81 (a), (b), (c), (d), and (e) are a perspective view, a perspective view, a front view, a top view, and a side view of the second lid portion 21, as viewed obliquely from the rear. The second lid portion 21 is formed by processing a metal plate. As shown in these drawings, the second lid portion 21 is composed of a flat plate-like main body portion 21a having an elongated rectangular shape. The main body portion 21 a has a vertically long rectangular shape that is approximately the same size as the opening of the rear surface of the second storage chamber 11. Further, small rectangular protrusions 21c are formed as caulking margins at the substantially central edges of both sides in the longitudinal direction of the main body 21a.

  Next, assembly of the shield case 1 according to the present invention will be described with reference to FIG. When the shield case 1 according to the present invention is assembled, the first lid 20 is disposed on the upper surface of the first storage chamber 10 as shown in FIGS. 2 Arranged on the rear surface of the storage chamber 11. Prior to this, a center contact and an insulating cylindrical body for holding the center contact substantially at the center are mounted in the first cylindrical portion 10b, the second cylindrical portion 10e, and the third cylindrical portion 11d. The terminal 24, the first output terminal 25, and the second output terminal 26 are assembled. Further, the first substrate 27a is attached using a plurality of bosses standing inside the first storage chamber 10, and the second substrate 27b is used using a plurality of bosses standing inside the second storage chamber 11. Install. Next, the connecting piece which is the rear end of the center contact of the input terminal 24, the first output terminal 25 and the second output terminal 26 is electrically connected to the first substrate 27a and the second substrate 27b by soldering or the like. This state is shown in FIG. 4A. A distribution circuit that distributes the signal input from the input terminal 24 to the first substrate 27a and the second substrate 27b, and a signal distributed by the distribution circuit are shown in FIG. A circuit for outputting from the first output terminal 25 and the second output terminal 26 is assembled.

In this state, the first lid 20 is fitted to the upper surface of the first storage chamber 10. As described above, the upper end of the wall portion 10a of the first storage chamber 10 is thinned to form a stepped portion. Therefore, when the first lid portion 20 is press-fitted into the upper surface of the first storage chamber 10, the periphery of the lower surface of the first lid portion 20 comes into contact with and is fitted to the step portion. At this time, the projection 20 c is fitted into the crimping portion 22, and the fitted projection 20 c is crimped into the crimping portion 22. As shown in FIG. 4B, the caulking process is performed to bend the protrusion 20 c to form the caulking portion 22, whereby electrical contact is made in the fitting portion between the first lid portion 20 and the first storage chamber 10. It will surely be done.
Further, the second lid portion 21 is fitted to the upper surface of the second storage chamber 11. As described above, the upper end of the wall portion 11a of the second storage chamber 11 is thinned to form a stepped portion. Therefore, when the second lid portion 21 is press-fitted into the rear surface of the second storage chamber 11, the periphery of the lower surface of the second lid portion 21 comes into contact with and is fitted to the step portion. At this time, each of the projections 21 c is fitted into the crimping portion 23, and the fitted projection 21 c is crimped into the crimping portion 23. As shown in FIG. 5B, the protrusions 21 c are bent to form the caulking portion 23 by the caulking process, and thereby the electrical contact is made at the fitting portion between the second lid portion 21 and the second storage chamber 11. Will surely be done.

  Thus, the shield case 1 according to the present invention is assembled, and the configuration thereof is shown in FIGS. Since the configuration of the shield case 1 according to the present invention is the same as described above, the description thereof will be omitted. However, in the shield case 1 according to the present invention, the input terminal 24 is connected with a coaxial cable that guides a signal from an antenna or the like. The other end of the coaxial cable having one end connected to an indoor television receiver or the like is connected to the output terminal 25 or the second output terminal 26. As a result, the television receiver can be viewed on the television receiver.

In the shield case 1 according to the present invention, the first lid portion 20 and the second lid portion 21 are crimped when fitted into the first storage chamber 10 and the second storage chamber 11. The effect of shielding by this caulking process is shown in FIGS. 14 to 25 show the electric field strengths of the horizontal polarization component and the vertical polarization component of unwanted radiation on the six surfaces of the shield case 1 of the present invention and the conventional shield case 100. The characteristic is indicated by a broken line, and the characteristic of the shield case 1 according to the present invention is indicated by a solid line. In this case, an RF signal having an input level of about 110 dBμV is input to the input terminal 24 in the shield case 1 of the present invention and to the input terminal 124 in the conventional shield case 100. A line indicated by a dotted line is a specified value.
FIG. 14 shows the unwanted radiated electric field intensity of the horizontal polarization component in front of the shield cases 1 and 100. Referring to FIG. 14, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but the shield case 1 according to the present invention is shielded at a frequency lower than about 1400 MHz. It can be seen that the effect is improved by about 7 dB at the maximum.
FIG. 15 shows the unnecessary radiated electric field intensity of the vertically polarized component in front of the shield cases 1 and 100. Referring to FIG. 15, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but the shield case 1 according to the present invention is shielded at a frequency lower than about 1900 MHz. It can be seen that the effect is improved by about 12 dB at the maximum.

FIG. 16 shows the unnecessary radiated electric field intensity of the horizontal polarization component on the left surface of the shield cases 1 and 100. Referring to FIG. 16, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB. However, the shield of the shield case 1 according to the present invention is used at a frequency lower than about 1500 MHz. It can be seen that the effect is improved by about 3 dB at the maximum.
FIG. 17 shows the unnecessary radiated electric field intensity of the vertically polarized component on the left surface of the shield cases 1 and 100. Referring to FIG. 17, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB. However, the shield of the shield case 1 according to the present invention is used at a frequency lower than about 1800 MHz. It can be seen that the effect is improved by about 13 dB at the maximum.

FIG. 18 shows the unnecessary radiated electric field intensity of the horizontal polarization component on the right surface of the shield cases 1 and 100. Referring to FIG. 18, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB. However, the shield of the shield case 1 according to the present invention is used at a frequency lower than about 1500 MHz. It can be seen that the effect is improved by about 8 dB at the maximum.
FIG. 19 shows the unnecessary radiated electric field intensity of the vertically polarized component on the right surface of the shield cases 1 and 100. Referring to FIG. 17, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB. However, the shield of the shield case 1 according to the present invention is used at a frequency lower than about 1600 MHz. It can be seen that the effect is improved by about 10 dB at the maximum.

FIG. 20 shows the unnecessary radiated electric field intensity of the horizontal polarization component on the rear surface of the shield cases 1 and 100. Referring to FIG. 20, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, and the present invention is applied at frequencies around 1000 MHz and around 2400 MHz. It can be seen that the shielding effect of the shield case 1 is improved by about 2 dB at the maximum.
FIG. 21 shows the unnecessary radiated electric field intensity of the vertically polarized component on the rear surface of the shield case 1, 100. Referring to FIG. 21, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the wave regulation value of about 34 dB. However, the shield of the shield case 1 according to the present invention is used at frequencies lower than about 1500 MHz. It can be seen that the effect is improved by about 10 dB at the maximum.

FIG. 22 shows the unwanted radiated electric field intensity of the horizontal polarization component on the upper surface of the shield case 1, 100. Referring to FIG. 22, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but the shield case 1 according to the present invention is shielded at a frequency lower than about 1400 MHz. It can be seen that the effect is improved by about 3 dB at the maximum.
FIG. 23 shows the unwanted radiation electric field intensity of the vertically polarized component on the upper surface of the shield cases 1 and 100. Referring to FIG. 23, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but according to the present invention at frequencies lower than about 1500 MHz and frequencies around 2000 MHz. It can be seen that the shielding effect of the shielding case 1 is improved by about 8 dB at the maximum.

FIG. 24 shows the unwanted radiated electric field intensity of the horizontally polarized component on the lower surface of the shield case 1, 100. Referring to FIG. 24, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but the present invention is applied at a frequency lower than about 1200 MHz and a frequency around 1900 MHz. It can be seen that the shielding effect of the shield case 1 is improved by about 6 dB at the maximum.
FIG. 25 shows the unwanted radiation field intensity of the vertically polarized component on the lower surface of the shield case 1, 100. Referring to FIG. 25, the conventional shield case 100 and the shield case 1 according to the present invention satisfy the specified value of about 34 dB, but the shield case 1 according to the present invention is shielded at a frequency lower than about 1300 MHz. It can be seen that the effect is improved by about 7 dB at the maximum.

  In the shield case 1 according to the present invention, it is considered that the shielding effect is improved for the following reason. When the lid portion and the opening are formed in an elongated shape when the lid portion is press-fitted into the opening, the central portion of the lid portion is likely to float from the opening. And in the floating part, since the electrical contact becomes unstable, it is considered that the shielding effect is reduced. In the shield case 1 according to the present invention, the protrusions 20c provided on the first lid part 20 are crimped to the notches 10g of the first storage chamber 10 to form the crimping part 22 and the protrusions 20c provided on the second lid part 21. The caulking portion 23 is formed by caulking the notch 11 b of the second storage chamber 11. Thereby, the 1st cover part 20 and the 2nd cover part 21 can be prevented from floating from opening of the 1st storage chamber 10 and the 2nd storage chamber 11, and an electrical contact can be stabilized. Therefore, in the shield case 1 according to the present invention, the shielding effect is improved.

In the shield case according to the present invention described above, when the lid portion is press-fitted into the opening, a portion that easily floats from the opening, for example, a substantially central portion in the longitudinal direction, is caulked. If it is thin and long, the portion that tends to float is not limited to the central portion in the longitudinal direction, so that it may be caulked in a plurality of portions in the longitudinal direction. Further, when the lid and the opening have a shape close to a square, they may be crimped on all sides. In addition, the caulking portion described above has a protrusion provided on the lid as a caulking allowance, and the caulking allowance is caulked into a notch provided in the opening. In addition, the shape of the notch is not limited to a rectangular shape, and may be a shape that matches the shape of the caulking allowance.
In the above description, the shield case of the present invention has two output terminals. However, the present invention is not limited to this, and the number of output terminals may be one or three. When the number of output terminals is one, the distribution circuit assembled on the substrate can be omitted, and when the number of output terminals is three, the distribution circuit assembled on the substrate can be divided into three.

DESCRIPTION OF SYMBOLS 1 Shield case, 10 1st storage chamber, 10a wall part, 10b 1st cylindrical part, 10c upper front part, 10d insertion hole, 10e 2nd cylindrical part, 10f engaging part, 10g notch, 11 2nd storage room, 11a Wall part, 11b Notch, 11c Lower front part, 11d Third cylindrical part, 11e Insertion part, 20 First lid part, 20a Body part, 20b Projection part, 20c Projection, 21 Second lid part, 21a Body part, 21c Projection , 22 Caulking portion, 23 Caulking portion, 24 Input terminal, 25 First output terminal, 26 Second output terminal, 27a First substrate, 27b Second substrate, 100 Shield case, 110 First storage chamber, 110a Wall portion, 110c Upper front part, 110d insertion hole, 110f engaging part, 111 second storage chamber, 111a wall part, 111c lower front part, 111e insertion part, 120 1 lid part, 120a body part, 120b protrusion, 121 second lid part, 121a body part, 122 fitting part, 123 fitting part, 124 input terminal, 125 first output terminal, 126 second output terminal, 127a first 1 substrate, 127b 2nd substrate

Claims (2)

A shield case including an input terminal, at least one output terminal, and a storage chamber in which a circuit for outputting a signal input from the input terminal is output from the output terminal;
A lid fitted into the opening of the storage chamber;
The shield case, wherein the lid portion is fitted into the opening so as to close the opening, and a crimping margin formed at an edge portion of the lid portion is crimped to an edge portion of the opening.   The protrusion is formed at a substantially central portion in the longitudinal direction of the lid portion, and a notch is formed at an edge of the opening, and the protrusion is caulked into the notch. Shield case.

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