US2766920A - Radio frequency shielded container for electronic devices - Google Patents

Radio frequency shielded container for electronic devices Download PDF

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Publication number
US2766920A
US2766920A US420013A US42001354A US2766920A US 2766920 A US2766920 A US 2766920A US 420013 A US420013 A US 420013A US 42001354 A US42001354 A US 42001354A US 2766920 A US2766920 A US 2766920A
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US
United States
Prior art keywords
radio frequency
container
electronic devices
layer
foil
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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.)
Expired - Lifetime
Application number
US420013A
Inventor
Ralph A Rawley
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Bomac Laboratories Inc
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Bomac Laboratories Inc
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Publication date
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Priority to US420013A priority Critical patent/US2766920A/en
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Publication of US2766920A publication Critical patent/US2766920A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/30—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants by excluding light or other outside radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
    • B65D3/04—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially cylindrical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/10—Metal foil

Definitions

  • the present invention relates to improvements in tubular containers and, more particularly, to an improved container for electronic devices that are extremely sensitive to radio frequency energy.
  • Devices of the type referred to in the art as crystal or diode rectifiers generally employ a semi-conductor material such as germanium or silicon which have very sensitive rectification properties. Such devices may be found in radar receiving apparatus to detect low power reflected radio frequency signals. Due to the inherent sensitivity of these devices, they may be damaged by exposure to radio frequency energy in excess of the limit of the device. This phenomenon is referred to as burn-out. It is, therefore, necessary to provide such devices with some form of radio frequency shielding during shipment or in storage.
  • the desired protection has been afforded in the electronics industry by means of a lead capsule or a nonmagnetic electrically conductive material completely enclosing the device with further standard paper board outer packaging.
  • Such protection requires not only additional expense in the cost of materials, but increases assembly labor costs since the operator must be certain that the device is completely shielded.
  • the packaged article must be removed for testing during storage, it is difiicult to re-package in the original container because the metallic material is readily deformable and subject to cracking, splitting or tearing after several foldings. it is sometimes more convenient to employ a new container, rather than have the article inadequately protected.
  • 1 t is an object of the present invention to provide means packaging sensitive electronic devices with radio fre quency radiation protection incorporated in a unitary structure.
  • a further object is to provide a simple and inexpensive container for packaging semi-conductor rectifiers which will adequately shield said articles from radio frequency energy during transit and storage.
  • a feature of the invention resides in the construction of a tubular container comprising two spirally wound inner layers of a paper backed metallic foil material with the foil in face to face relationship.
  • An outer layer of a lrraft or other similar paper board is spirally wound around the foil layers to complete the tube.
  • the embodiment of my invention provides within itself safe protection from exposure to radio frequency energy. Because of the simplicity of construction the shielded tube be manufactured on standard paper tube machinery.
  • Figure l is a perspective view of the illustrative embodiment with the components partially broken away to disclose underlying structure
  • Figure 2 is an end view in detail of the complete container
  • Figure 3 is a detailed vertical cross sectional view of the embodiment with the exposed packaged article in perspective.
  • Figure 4 is a detailed vertical cross sectional view of an alternative embodiment.
  • the illustrative embodiment 1 comprises an inner tubular sleeve formed by a spirally wound layer of a thin paper backed metallic foil material 2 having foil face 3 extending outwardly. Spirally wound on this layer is a similar material 4 with the foil 5 in face to face relationship with underlying foil layer 3. This layer is wound in such a manner that the butt joint 6 of the underlying layer is overlapped. Any suitable adhesive bonds the two paper backed foil layers together.
  • an aluminum foil material having a foil thickness of approximately one thousandth of an inch was employed.
  • An outer sleeve of a kraft or similar fibrous material 7 having a thickness approximately equal to that of the inner two layer sleeve is spirally and adhesively wound on said inner sleeve to complete the container.
  • This layer may also be formed so as to overlap the butt joint 8 of layer 4.
  • the sensitive electronic device 9 of tubular construction when supported in my improved container will be safely protected from radio frequency energy even with the ends of said container open.
  • the container 1 may be modified as shown in Figure 4 to provide a complete enclosure.
  • a disc shaped end member 10 having a foil face disposed inwardly may be provided at one end with an outer body member 11 friction-fitted over the tubular container 1.
  • a similar disc member 12 is disposed at the other end followed by a friction-fitted cap 13 having a foil lining 14. Said cap rests against outer body member 11 as at 15.
  • Radio frequency shielded tubular container for elec tronic devices comprising a spirally wound inner layer of a thin metallic foil material having a fibrous material backing with said foil material extending outwardly, the adjacent edges of said inner layer forming a butt joint, an intermediate layer of a similar material spirally wound on and adhesively secured to said inner layer with said foil material in face to face relationship and the spiral windings of said intermediate layer overlapping the butt joints of said inner layer, and an outer layer of a fibrous material spirally wound on and adhesively secured to the fibrous material of said intermediate foil layer.
  • a radio frequency shielded tubular container for a semi-conductor crystal unit comprising an inner sleeve having a plurality of super-imposed spirally wound layers of a metallic foil material having a fibrous material backing with said foil material positioned in face to face relationship, the inner layer of said inner sleeve having adjacent edges forming a butt joint, the outer layer of said inner sleeve overlapping the butt joint of adjacent edges of the underlying inner layer and an outer sleeve of a fibrous material surrounding said inner sleeve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Description

R. 'A. RAWLEY -Oct. 16, 1956 RADIO FREQUENCY SHIELDED CONTAINER FOR ELECTRONIC DEVICES Filed March 31, 1954 FIG-.3
INVENTOR. A. RAWLEY RALPH BY d;
ATTORNEY United States Patent RADIO FREQUENCY SHIELDED CONTAINER FOR ELECTRONIC DEVICES Ralph A. Rawley, Wenham, Mass., assignor to Bomac Laboratories Inc., Beverly, Mass., a corporation of Massachusetts Application March 31, 1954, Serial No. 420,013 2 Claims. (Cl. 229--3.5D
The present invention relates to improvements in tubular containers and, more particularly, to an improved container for electronic devices that are extremely sensitive to radio frequency energy.
Devices of the type referred to in the art as crystal or diode rectifiers generally employ a semi-conductor material such as germanium or silicon which have very sensitive rectification properties. Such devices may be found in radar receiving apparatus to detect low power reflected radio frequency signals. Due to the inherent sensitivity of these devices, they may be damaged by exposure to radio frequency energy in excess of the limit of the device. This phenomenon is referred to as burn-out. It is, therefore, necessary to provide such devices with some form of radio frequency shielding during shipment or in storage.
The desired protection has been afforded in the electronics industry by means of a lead capsule or a nonmagnetic electrically conductive material completely enclosing the device with further standard paper board outer packaging. Such protection requires not only additional expense in the cost of materials, but increases assembly labor costs since the operator must be certain that the device is completely shielded. Further, if the packaged article must be removed for testing during storage, it is difiicult to re-package in the original container because the metallic material is readily deformable and subject to cracking, splitting or tearing after several foldings. it is sometimes more convenient to employ a new container, rather than have the article inadequately protected.
1 t is an object of the present invention to provide means packaging sensitive electronic devices with radio fre quency radiation protection incorporated in a unitary structure.
A further object is to provide a simple and inexpensive container for packaging semi-conductor rectifiers which will adequately shield said articles from radio frequency energy during transit and storage.
A feature of the invention resides in the construction of a tubular container comprising two spirally wound inner layers of a paper backed metallic foil material with the foil in face to face relationship. An outer layer of a lrraft or other similar paper board is spirally wound around the foil layers to complete the tube. The embodiment of my invention provides within itself safe protection from exposure to radio frequency energy. Because of the simplicity of construction the shielded tube be manufactured on standard paper tube machinery.
Other objects, features and advantages will be more readily appreciated after consideration of the following detailed specification and accompanying drawings, in which:
Figure l is a perspective view of the illustrative embodiment with the components partially broken away to disclose underlying structure;
Figure 2 is an end view in detail of the complete container;
Figure 3 is a detailed vertical cross sectional view of the embodiment with the exposed packaged article in perspective; and
Figure 4 is a detailed vertical cross sectional view of an alternative embodiment.
As shown in Figure l the illustrative embodiment 1 comprises an inner tubular sleeve formed by a spirally wound layer of a thin paper backed metallic foil material 2 having foil face 3 extending outwardly. Spirally wound on this layer is a similar material 4 with the foil 5 in face to face relationship with underlying foil layer 3. This layer is wound in such a manner that the butt joint 6 of the underlying layer is overlapped. Any suitable adhesive bonds the two paper backed foil layers together. In the illustrative embodiment an aluminum foil material having a foil thickness of approximately one thousandth of an inch was employed. An outer sleeve of a kraft or similar fibrous material 7 having a thickness approximately equal to that of the inner two layer sleeve is spirally and adhesively wound on said inner sleeve to complete the container. This layer may also be formed so as to overlap the butt joint 8 of layer 4.
As shown in Figure 3 the sensitive electronic device 9 of tubular construction when supported in my improved container will be safely protected from radio frequency energy even with the ends of said container open. If desired, the container 1 may be modified as shown in Figure 4 to provide a complete enclosure. A disc shaped end member 10 having a foil face disposed inwardly may be provided at one end with an outer body member 11 friction-fitted over the tubular container 1. A similar disc member 12 is disposed at the other end followed by a friction-fitted cap 13 having a foil lining 14. Said cap rests against outer body member 11 as at 15.
Various other modifications will occur to those skilled in the art. It is, therefore, my intention to cover in the appended claims such modifications or variations as fall within the spirit and scope of the invention.
What is claimed is:
1. Radio frequency shielded tubular container for elec tronic devices comprising a spirally wound inner layer of a thin metallic foil material having a fibrous material backing with said foil material extending outwardly, the adjacent edges of said inner layer forming a butt joint, an intermediate layer of a similar material spirally wound on and adhesively secured to said inner layer with said foil material in face to face relationship and the spiral windings of said intermediate layer overlapping the butt joints of said inner layer, and an outer layer of a fibrous material spirally wound on and adhesively secured to the fibrous material of said intermediate foil layer.
2. A radio frequency shielded tubular container for a semi-conductor crystal unit comprising an inner sleeve having a plurality of super-imposed spirally wound layers of a metallic foil material having a fibrous material backing with said foil material positioned in face to face relationship, the inner layer of said inner sleeve having adjacent edges forming a butt joint, the outer layer of said inner sleeve overlapping the butt joint of adjacent edges of the underlying inner layer and an outer sleeve of a fibrous material surrounding said inner sleeve.
References Cited in the tile of this patent UNITED STATES PATENTS 732,862 Jones July 7, 1903 1,983,520 Charch et al Dec. 11, 1934 2,039,372 Wickrnann May 5, 1936 2,247,197 Graves June 24, 1941 2,355,584 Douglas Aug. 8, 1944 2,484,608 Cheyney et al. Oct. 11, 1949 2,555,380 Stuart et al. June 5, 1951
US420013A 1954-03-31 1954-03-31 Radio frequency shielded container for electronic devices Expired - Lifetime US2766920A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917217A (en) * 1956-04-30 1959-12-15 St Regis Paper Co Foamed polystyrene article
US3002122A (en) * 1950-05-01 1961-09-26 Hilbert J Unger Shock resistant electron tube mounting
US3070281A (en) * 1960-11-02 1962-12-25 Sonoco Products Co Foam coated paper tube
US3077979A (en) * 1960-02-29 1963-02-19 Empire Corp Sample container
US3091262A (en) * 1957-08-19 1963-05-28 Darworth Inc Metal-fiber reinforced resin laminate
US3120319A (en) * 1962-07-09 1964-02-04 David J Buddrus Protective container
US3240234A (en) * 1960-02-24 1966-03-15 Union Carbide Corp Hose for low-temperature liquids
US3341102A (en) * 1965-05-13 1967-09-12 Giles D Stephens Cartons for protection and storage of magnetically sensitive materials
US3608769A (en) * 1969-06-09 1971-09-28 Nuclear Engineering Co Inc Shipping container arrangement
EP0216311A1 (en) * 1985-09-20 1987-04-01 Hans Kolb Wellpappe Container and method for its manufacture
US8522977B1 (en) * 2012-09-11 2013-09-03 Google Inc. Method and system for protective radio frequency shielding packaging
US9939423B2 (en) 2015-05-21 2018-04-10 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US732862A (en) * 1902-05-14 1903-07-07 Elmer M Jones Can or vessel.
US1983520A (en) * 1931-04-22 1934-12-11 Du Pont Cellophane Co Inc Laminated material
US2039372A (en) * 1936-05-05 Insulator
US2247197A (en) * 1939-07-26 1941-06-24 Sefton Fibre Can Company Manufacture of helically wound tubing with impervious lining
US2355584A (en) * 1939-05-15 1944-08-08 Cleveland Container Company Tubular container
US2484608A (en) * 1945-11-30 1949-10-11 Wingfoot Corp Lightweight container
US2555380A (en) * 1940-10-26 1951-06-05 Elizabeth R B Stuart Container

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2039372A (en) * 1936-05-05 Insulator
US732862A (en) * 1902-05-14 1903-07-07 Elmer M Jones Can or vessel.
US1983520A (en) * 1931-04-22 1934-12-11 Du Pont Cellophane Co Inc Laminated material
US2355584A (en) * 1939-05-15 1944-08-08 Cleveland Container Company Tubular container
US2247197A (en) * 1939-07-26 1941-06-24 Sefton Fibre Can Company Manufacture of helically wound tubing with impervious lining
US2555380A (en) * 1940-10-26 1951-06-05 Elizabeth R B Stuart Container
US2484608A (en) * 1945-11-30 1949-10-11 Wingfoot Corp Lightweight container

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002122A (en) * 1950-05-01 1961-09-26 Hilbert J Unger Shock resistant electron tube mounting
US2917217A (en) * 1956-04-30 1959-12-15 St Regis Paper Co Foamed polystyrene article
US3091262A (en) * 1957-08-19 1963-05-28 Darworth Inc Metal-fiber reinforced resin laminate
US3240234A (en) * 1960-02-24 1966-03-15 Union Carbide Corp Hose for low-temperature liquids
US3077979A (en) * 1960-02-29 1963-02-19 Empire Corp Sample container
US3070281A (en) * 1960-11-02 1962-12-25 Sonoco Products Co Foam coated paper tube
US3120319A (en) * 1962-07-09 1964-02-04 David J Buddrus Protective container
US3341102A (en) * 1965-05-13 1967-09-12 Giles D Stephens Cartons for protection and storage of magnetically sensitive materials
US3608769A (en) * 1969-06-09 1971-09-28 Nuclear Engineering Co Inc Shipping container arrangement
EP0216311A1 (en) * 1985-09-20 1987-04-01 Hans Kolb Wellpappe Container and method for its manufacture
US4684020A (en) * 1985-09-20 1987-08-04 Conductive Container, Inc. Conductive container
US8522977B1 (en) * 2012-09-11 2013-09-03 Google Inc. Method and system for protective radio frequency shielding packaging
US9939423B2 (en) 2015-05-21 2018-04-10 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials
US9939422B2 (en) 2015-05-21 2018-04-10 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials
US10018614B2 (en) 2015-05-21 2018-07-10 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials
US10648964B2 (en) 2015-05-21 2020-05-12 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials

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