US20020046859A1 - Shield case for a radio-frequency appliance - Google Patents
Shield case for a radio-frequency appliance Download PDFInfo
- Publication number
- US20020046859A1 US20020046859A1 US09/817,763 US81776301A US2002046859A1 US 20020046859 A1 US20020046859 A1 US 20020046859A1 US 81776301 A US81776301 A US 81776301A US 2002046859 A1 US2002046859 A1 US 2002046859A1
- Authority
- US
- United States
- Prior art keywords
- shield
- plate
- side plate
- bending allowance
- connecting portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]
- H05K9/0024—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields
- H05K9/0026—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields integrally formed from metal sheet
Definitions
- This invention relates generally to shield cases for radio-frequency appliances and, more particularly, to a shield case for a radio-frequency appliance formed in a state of development by blanking a metal sheet such as of iron, stainless steel, aluminum, copper or phosphor bronze to be assembled upon being mounted onto a circuit board.
- FIGS. 1 and 2 show a first prior art of a shield case for a radio-frequency appliance of this kind.
- FIG. 1 shows an assembled state while FIG. 2 a development state.
- the first prior-art shield case includes two side plates 2 and 3 formed by blanking a metal sheet and two shield plates 4 and 5 formed connected to the side plates 2 and 3 through connecting portions and arranged close to each other due to assembling.
- Protuberances 4 a and 5 a are formed in respective opposite end edges of the two shield plates 4 and 5 in a development state, so that they can be inserted in a circuit board (not shown) and connected to a reference potential.
- a recess 4 b can be formed in an end edge of the shied plate 4 opposite to the protuberance 4 a so that it can be engaged with a shield plate 6 due to assembling.
- the shield plates 4 and 5 are twisted such that the surfaces of the shield plates 4 and 5 shown in FIG. 2 are positioned outward.
- the protuberances 4 a and 5 a are inserted in and soldered to the insertion holes of the circuit board.
- a protuberance 6 a of the shield plate 6 is inserted in a circuit-board hole in the similar manner and a protuberance 6 b is engaged with the recess 4 b of the shield plate 4 .
- a metal sheet is blanked in a manner similar to the first prior art, to form two side plates 2 and 3 as well as two shield plates 4 and 5 connected between the side plates 2 and 3 through connecting portions.
- Protuberances 4 a and 5 a are formed in end edges of the two shield plates 4 and 5 on the same side in a development state.
- a recess Sb is formed in an end edge of the shield plate 5 in order to allow the protuberance 4 a of the shield plate 4 to escape.
- the shield plates 4 and 5 are twisted such that one of the surfaces of the shield plates 4 and 5 shown in FIG. 4 is on an inner side and the other outward.
- the protuberance 4 a and Sa are inserted in and soldered to the insertion holes of the circuit board.
- the shield plate 6 is formed as a separate member thus increasing the number of parts.
- the shield plate 6 can be formed in one body with the shield plate 4 if increasing the distance between the shield plate 4 and the shield plate 5 .
- the shield case will increase in size. Therefore, the shield plate 6 must be made as a separate member in the case there exists a restriction in space or shape.
- the recess 5 b of the shield plate 5 must be made greater as the two shield plates 4 and 5 are arranged closer to each other, thus resulting in deterioration in shield effects.
- Another object of the invention is to provide a shield case for a radio-frequency appliance capable of comparatively freely coping with circuit arrangement and securing shield effects while having side plates and shield plates formed by blanking one metal sheet.
- a shield case for a radio-frequency appliance comprises: first and second side plates formed by blanking a metal sheet; first and second shield plates formed with spacing between the first side plate and the second side plate; a first connecting portion connecting the first shield plate to both the first side plate and the second side plate; a second connecting portion connecting the second shield plate to both the first side plate and the side plate; a first bending allowance formed between the first connecting portion and the second connecting portion of the first side plate; a second bending allowance formed between the first connecting portion and the second connecting portion of the second side plate, wherein the first bending allowance and the second bending allowance during assembling are bent inward between the first shield plate and the second shield plate.
- a protuberance is formed protruding toward the second shield plate from a first end edge of the first shield plate on a side close to the second shield plate in a development state, wherein the first bending allowance and the second bending allowance are set each to have a length greater than a length of the protuberance.
- a third shield plate is formed in a second end edge of the first shield plate on a side opposite to the first end edge through a third connecting portion.
- the bent portions at outer side are shielded by the engaging portions.
- the first bending allowance is formed in a widthwise part of the first side plate and the second bending allowance is formed in a widthwise part of the second side plate, further comprising a first engaging portion to be engaged with another widthwise portion of the first side plate by sandwiching the first bending allowance; and a second engage portion to be engaged with another widthwise portion of the second side plate by sandwiching the second bending allowance, wherein when the first bending allowance and the second bending allowance are bent inward, the first engaging portion is engaged together and the second engaging portion is engaged together.
- the distance between the first shield plate and the second shield plate increases.
- one metal sheet is blanked so that a sheet left is bent to form various portions into one body, thus reducing the number of parts and simplifying assembling operation. Furthermore, as compared to combination with separate parts, positional accuracy is improved and electric characteristic is stabilized, resulting in improved quality. Meanwhile, it is possible to reduce cost, i.e. the die cost required for separate parts. Furthermore, the provision of bending allowances allows for setting, in a development state, a spacing between the first and second shield plates freely, thus simplifying design.
- FIG. 1 is a perspective view showing an example of a conventional shield case for a radio-frequency appliance
- FIG. 2 is a development view of the FIG. 1 prior art
- FIG. 3 is a perspective view showing another example of a structure of a conventional shield case for a radio-frequency appliance
- FIG. 4 is a development view of the FIG. 3 prior art
- FIG. 5 is a perspective view showing an embodiment of this invention.
- FIG. 6 is a development view showing the FIG. 5 embodiment.
- a shield case 10 of this embodiment is formed by blanking a metal sheet similarly to the foregoing prior art.
- the shield case 10 includes two side plates 12 and 14 as well as two shield plates 24 and 26 formed connecting between the side plates 12 and 14 through a first connecting portion 16 , first connecting portion 18 , second connecting portion 20 and second connecting portion 22 .
- a protuberance 24 a is formed in a first end edge of the first shield plate 24 that is positioned on a side close to a second shield plate 26 in a development state.
- the protuberance 24 a is to be inserted in a board (not shown) and connected to a reference potential. Accordingly, the spacing between the first shield plate 24 and the second plate 26 is given greater than a length of the protuberance 24 a .
- the prior art of FIG. 3 formed a protuberance in one shield plate and a cut-out or recess in the other shield plate to allow the protuberance to escape, this embodiment provides a distance greater than a length of the protuberance 24 a to between the shield plates 24 and 26 . This prevents the shield effect from being reduced by the recess.
- third shield plate 30 is formed in a second end edge of the shield plate 24 on a side opposite to the protuberance 24 a , which is integrally connected to the shield plate 24 through a connecting portion 28 .
- the shield plate may be formed with a protuberance 30 a for connection to the reference potential.
- the shield 30 can be formed in the shield plate 24 on a side opposite to the shield plate 26 , there is no need to form the third shield plate as a separate member. However, this third shield plate 30 where unnecessary can be omitted.
- the shield case 10 of this embodiment is characterized by the first and second side plates 12 and 14 . That is, the first side plate 12 , in an area between the first connecting portion 16 and the second connecting portion 20 , is formed as a bending allowance 32 having a width of nearly a half of the entire width of the side plate 12 . Similarly, the second side plate 14 , in an area between the first connecting portion 18 and the second connecting portion 22 , is formed as a bending allowance 34 having a width of nearly a half of the entire width of the side plate 14 .
- two engaging portions 36 a and 36 b are formed in an area above the bending allowance 32 of the side plate 12 such that they project in a nest relation to each other from the positions corresponding to the opposite ends of the bending allowance 32 .
- Engaging portions 38 a and 38 b are formed similarly in the side plate 14 in an area above the bending allowance 34 .
- the two side plates 12 and 14 are bent at the connecting portions 16 - 20 by 90 degrees such that the surfaces appearing in FIG. 6 are both directed outward.
- the shield plate 24 and the shield plate 26 are bent at the connecting portions 16 - 22 by 90 degrees such that the surfaces thereof shown in FIG. 6 are directed inward. That is, the two side plates 12 and 14 are twisted in opposite directions, and the shield plates 24 and 24 are likewise twisted in opposite directions.
- the third shield plate 30 is also bent at the connecting portion 28 by 90 degrees toward the same direction as that of the side plate 14 .
- the first bending allowance 32 and the second bending allowance 34 respectively provided in the first side plate 12 and the second side plate 14 are bent to a point where connections are made between the first connecting portions 36 a and 36 b in the first side plate 12 as well as between the second connecting portions 38 a and 38 b in the second side plate 14 , as shown in FIG. 5.
- the distance between the shield plate 24 and the shield plate 26 can be freely provided to meet the circuit configuration of the circuit board (not shown) by the length of the bending allowance 32 and 34 and the bending amount thereof. Accordingly, even where the shield plate 24 and the shield plate 26 are arranged close in distance between them, the shield plate 30 can be formed together with the other shield plates by use of one metal sheet.
- a shield case 10 assembled as in FIG. 5 is rested on the circuit board.
- the protuberances 24 a and 30 are inserted in the circuit-board holes (not shown) and soldered to the grounding reference potential.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
- 1. Field of the Invention
- This invention relates generally to shield cases for radio-frequency appliances and, more particularly, to a shield case for a radio-frequency appliance formed in a state of development by blanking a metal sheet such as of iron, stainless steel, aluminum, copper or phosphor bronze to be assembled upon being mounted onto a circuit board.
- 2. Description of the Prior Art
- For the radio-frequency appliances, there is a proposal of doubly providing the shield plates in order to exclude radio-frequency interference.
- FIGS. 1 and 2 show a first prior art of a shield case for a radio-frequency appliance of this kind. FIG. 1 shows an assembled state while FIG. 2 a development state. The first prior-art shield case includes two
side plates shield plates side plates Protuberances shield plates recess 4 b can be formed in an end edge of theshied plate 4 opposite to theprotuberance 4 a so that it can be engaged with ashield plate 6 due to assembling. - In assembling the first prior art, the
shield plates shield plates protuberances protuberance 6 a of theshield plate 6 is inserted in a circuit-board hole in the similar manner and aprotuberance 6 b is engaged with therecess 4 b of theshield plate 4. - In the case of a second prior-
art shield case 1 shown in FIG. 3 and FIG. 4, a metal sheet is blanked in a manner similar to the first prior art, to form twoside plates shield plates side plates Protuberances shield plates shield plate 5 in order to allow theprotuberance 4 a of theshield plate 4 to escape. - In assembling the second prior art, the
shield plates shield plates protuberance 4 a and Sa are inserted in and soldered to the insertion holes of the circuit board. - In the first prior art, the
shield plate 6 is formed as a separate member thus increasing the number of parts. However, in the first prior art, theshield plate 6 can be formed in one body with theshield plate 4 if increasing the distance between theshield plate 4 and theshield plate 5. In this case, however, the shield case will increase in size. Therefore, theshield plate 6 must be made as a separate member in the case there exists a restriction in space or shape. - In the second prior art, where the spacing between the
shield plate 4 and theshield plate 5 has to be decreased due to the limitation of circuit arrangement or the like, therecess 5 b of theshield plate 5 must be made greater as the twoshield plates - Therefore, it is a primary object of this invention to provide a novel shield case for a radio-frequency appliance.
- Another object of the invention is to provide a shield case for a radio-frequency appliance capable of comparatively freely coping with circuit arrangement and securing shield effects while having side plates and shield plates formed by blanking one metal sheet.
- A shield case for a radio-frequency appliance according to the present invention comprises: first and second side plates formed by blanking a metal sheet; first and second shield plates formed with spacing between the first side plate and the second side plate; a first connecting portion connecting the first shield plate to both the first side plate and the second side plate; a second connecting portion connecting the second shield plate to both the first side plate and the side plate; a first bending allowance formed between the first connecting portion and the second connecting portion of the first side plate; a second bending allowance formed between the first connecting portion and the second connecting portion of the second side plate, wherein the first bending allowance and the second bending allowance during assembling are bent inward between the first shield plate and the second shield plate.
- Where a projection for setting a reference potential is provided in the shield plate, a protuberance is formed protruding toward the second shield plate from a first end edge of the first shield plate on a side close to the second shield plate in a development state, wherein the first bending allowance and the second bending allowance are set each to have a length greater than a length of the protuberance.
- Where integrating a third shield plate, a third shield plate is formed in a second end edge of the first shield plate on a side opposite to the first end edge through a third connecting portion.
- If there is reduction in shield effect when bending inward the bending allowances, the bent portions at outer side are shielded by the engaging portions. Specifically, the first bending allowance is formed in a widthwise part of the first side plate and the second bending allowance is formed in a widthwise part of the second side plate, further comprising a first engaging portion to be engaged with another widthwise portion of the first side plate by sandwiching the first bending allowance; and a second engage portion to be engaged with another widthwise portion of the second side plate by sandwiching the second bending allowance, wherein when the first bending allowance and the second bending allowance are bent inward, the first engaging portion is engaged together and the second engaging portion is engaged together.
- When assembling a shield plate having, in a development state, a first bending allowance formed between a first connecting portion and a second connecting portion of the first side plate and a second bending allowance formed between a first connecting portion and a second connecting portion of the second side plate, the first and second side plates as well as the first and second shield plates are twisted by 90 degrees to a perpendicular position to a circuit board. In this case, because the first and second bending allowances are bent inward between the first and second shield plates, the spacing between the first and second shield plates, even if great in the development state, can be decreased. For example, where forming protuberances in the side end edges of the first and second shield plates in the development state, the distance between the first shield plate and the second shield plate increases. In such a case, however, it is satisfactory to set the first and second bending allowances with length greater than a length of the protuberance in the development state and these bending allowances are bent inward during assembling.
- According to the present invention, one metal sheet is blanked so that a sheet left is bent to form various portions into one body, thus reducing the number of parts and simplifying assembling operation. Furthermore, as compared to combination with separate parts, positional accuracy is improved and electric characteristic is stabilized, resulting in improved quality. Meanwhile, it is possible to reduce cost, i.e. the die cost required for separate parts. Furthermore, the provision of bending allowances allows for setting, in a development state, a spacing between the first and second shield plates freely, thus simplifying design.
- The above described objects and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
- FIG. 1 is a perspective view showing an example of a conventional shield case for a radio-frequency appliance;
- FIG. 2 is a development view of the FIG. 1 prior art;
- FIG. 3 is a perspective view showing another example of a structure of a conventional shield case for a radio-frequency appliance;
- FIG. 4 is a development view of the FIG. 3 prior art;
- FIG. 5 is a perspective view showing an embodiment of this invention; and
- FIG. 6 is a development view showing the FIG. 5 embodiment.
- Referring to FIG. 5 and FIG. 6, a
shield case 10 of this embodiment is formed by blanking a metal sheet similarly to the foregoing prior art. In FIG. 6 showing a development state, theshield case 10 includes twoside plates shield plates side plates portion 16, first connectingportion 18, second connectingportion 20 and second connectingportion 22. - A
protuberance 24 a is formed in a first end edge of thefirst shield plate 24 that is positioned on a side close to asecond shield plate 26 in a development state. Theprotuberance 24 a is to be inserted in a board (not shown) and connected to a reference potential. Accordingly, the spacing between thefirst shield plate 24 and thesecond plate 26 is given greater than a length of theprotuberance 24 a. Although the prior art of FIG. 3 formed a protuberance in one shield plate and a cut-out or recess in the other shield plate to allow the protuberance to escape, this embodiment provides a distance greater than a length of theprotuberance 24 a to between theshield plates - Also,
third shield plate 30 is formed in a second end edge of theshield plate 24 on a side opposite to theprotuberance 24 a, which is integrally connected to theshield plate 24 through a connectingportion 28. The shield plate may be formed with aprotuberance 30 a for connection to the reference potential. - Because the
shield 30 can be formed in theshield plate 24 on a side opposite to theshield plate 26, there is no need to form the third shield plate as a separate member. However, thisthird shield plate 30 where unnecessary can be omitted. - The
shield case 10 of this embodiment is characterized by the first andsecond side plates first side plate 12, in an area between the first connectingportion 16 and the second connectingportion 20, is formed as abending allowance 32 having a width of nearly a half of the entire width of theside plate 12. Similarly, thesecond side plate 14, in an area between the first connectingportion 18 and the second connectingportion 22, is formed as abending allowance 34 having a width of nearly a half of the entire width of theside plate 14. Furthermore, twoengaging portions bending allowance 32 of theside plate 12 such that they project in a nest relation to each other from the positions corresponding to the opposite ends of thebending allowance 32. Engagingportions side plate 14 in an area above the bendingallowance 34. - During assembling, as shown in FIG. 5 the two
side plates shield plate 24 and theshield plate 26 are bent at the connecting portions 16-22 by 90 degrees such that the surfaces thereof shown in FIG. 6 are directed inward. That is, the twoside plates shield plates third shield plate 30 is also bent at the connectingportion 28 by 90 degrees toward the same direction as that of theside plate 14. - At this time, the
first bending allowance 32 and thesecond bending allowance 34 respectively provided in thefirst side plate 12 and thesecond side plate 14 are bent to a point where connections are made between the first connectingportions first side plate 12 as well as between the second connectingportions second side plate 14, as shown in FIG. 5. The distance between theshield plate 24 and theshield plate 26 can be freely provided to meet the circuit configuration of the circuit board (not shown) by the length of the bendingallowance shield plate 24 and theshield plate 26 are arranged close in distance between them, theshield plate 30 can be formed together with the other shield plates by use of one metal sheet. - Then, a
shield case 10 assembled as in FIG. 5 is rested on the circuit board. Theprotuberances - Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-86033 | 2000-03-27 | ||
JP2000086033A JP3773748B2 (en) | 2000-03-27 | 2000-03-27 | Shield case for high frequency equipment |
JP2000-086033 | 2000-03-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020046859A1 true US20020046859A1 (en) | 2002-04-25 |
US6392139B1 US6392139B1 (en) | 2002-05-21 |
Family
ID=18602263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/817,763 Expired - Fee Related US6392139B1 (en) | 2000-03-27 | 2001-03-27 | Shield case for a radio-frequency appliance |
Country Status (3)
Country | Link |
---|---|
US (1) | US6392139B1 (en) |
JP (1) | JP3773748B2 (en) |
CN (1) | CN1268186C (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4370515A (en) * | 1979-12-26 | 1983-01-25 | Rockwell International Corporation | Electromagnetic interference |
JPH0541588Y2 (en) * | 1986-12-25 | 1993-10-20 | ||
GB2297868B (en) * | 1995-02-07 | 1999-04-28 | Nokia Mobile Phones Ltd | A shielding device |
-
2000
- 2000-03-27 JP JP2000086033A patent/JP3773748B2/en not_active Expired - Fee Related
-
2001
- 2001-03-27 US US09/817,763 patent/US6392139B1/en not_active Expired - Fee Related
- 2001-03-27 CN CNB011192860A patent/CN1268186C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US6392139B1 (en) | 2002-05-21 |
JP3773748B2 (en) | 2006-05-10 |
CN1268186C (en) | 2006-08-02 |
JP2001274581A (en) | 2001-10-05 |
CN1338894A (en) | 2002-03-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SANYO ELECTRIC CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUMA, HIDEYUKI;HARADA, TOSHIYUKI;REEL/FRAME:011894/0162 Effective date: 20010606 Owner name: SANYO TUNERS INDUSTRIES CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUMA, HIDEYUKI;HARADA, TOSHIYUKI;REEL/FRAME:011894/0162 Effective date: 20010606 |
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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20100521 |