US3528047A - Miniaturized high-frequency transformer - Google Patents

Miniaturized high-frequency transformer Download PDF

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Publication number
US3528047A
US3528047A US823271A US3528047DA US3528047A US 3528047 A US3528047 A US 3528047A US 823271 A US823271 A US 823271A US 3528047D A US3528047D A US 3528047DA US 3528047 A US3528047 A US 3528047A
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US
United States
Prior art keywords
core
transformer
supporter
cap
hole
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.)
Expired - Lifetime
Application number
US823271A
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English (en)
Inventor
Kazutomo Iwata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3528047A publication Critical patent/US3528047A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core

Definitions

  • a miniaturized high-frequency transformer comprising: a cap core having an adjusting magnetic core at its center and an adjustment groove at its closed end; a core supporter having a hole at its center and another adjustment groove at its closed end; a terminal board member having coils wound thereon and a through tapping hole, the core supporter being in threaded engagement with the tapping hole so that the core supporter is firmly and adjustably coupled with the terminal board member and the resulting assembly is covered with the cap core with the adjusting magnetic core inserted into the hole in the core supporter; and a shield case for substantially enclosing the assembled transformer structure, whereby the inductance of the transformer is adjustable on either one of the opposite sides of the structure.
  • the present invention relates to a miniaturized highfrequency transformer used for example, in a miniaturized television receiver and is intended to provide a miniaturized transformer structure which has high performance and the inductance of which can be adjusted on either one of the opposite sides of the structure so that the transformer structure can be assembled on a printedcircuit board.
  • a cap-shaped ferrite core which covers coils is used in order to prevent quality factor (Q) of the transformer from being lowered due to the proximity effect by a shield case, and in almost all the conventional high-frequency transformers, the arrangement has been such that coils are wound on a ferrite core which is drum-shaped and the resulting core assembly is adjustably covered with a cap-shaped core which is provided with an adjusting groove at its closed end and is further threaded on its outer periphery for the purpose of moving the cap-shaped core to adjust the inductance of the transformer.
  • the adjustment of the inductance of a high-frequency transformer is performed only on one side (e.g., at the top portion) of the transformer, so that a completed miniaturized device such as a miniaturized television receiver must have included a space necessary for performing adjustment of the inductance of such a transformer, thus obstructing miniaturization of completed devices which include such a transformer.
  • the present invention relates to a high-frequency trans- ,former free from the disadvantages mentioned above.
  • FIG. 1 is a half cross-sectional front view of a high frequency transformer in accordance with an embodiment of the present invention
  • FIG. 2 is a perspective view of the major parts of the transformer shown in FIG. 1 is a disassembled state
  • FIG. 3 is a perspective view of a cap-shaped core which is used in the transformer.
  • numeral 1 designates a terminal board member in the center of which a hole 2 is bored to define a tapping cylindrical wall and which, at its upper portion, has a winding section 4. Coils 3 are wound on the section 4.
  • the hole 2, hereafter referred to as tapping hole, of the terminal board member 1 is.bored in the form of a through hole, and a shaft section 6 of a core supporter 5 made of a thermoplastic resin in a threaded engagement with the tapping hole 2 by means of self-tapping technique.
  • a plurality of ridges 7 are provided on the periphery of the shaft section 6 in the axial direction of the shaft section 6 so that the ridges 7 may be tapped when the core supporter 5 is adjustably fitted into the tapping hole 2 by simultaneously turning and depressing the core supporter 5.
  • an adjustment groove 8 is formed, on a flange section 9 of the core supporter 5 two protuberances 10 are formed, and a hole 11 is defined extending through the flange section 9 and part of the shaft section 6.
  • the core supporter 5 having such a construction as mentioned is coupled with a cap core 13 which is in the form of a hollow cylinder and has an adjusting magnetic core 12 extending axially of the cap core 13 and located at the center of the cylinder.
  • Funnel-shaped holes 20 tapering downwardly as viewed in FIG. 3 are defined in the top plate of the cap core 13 at positions to be engaged with the protuberances 10 of the core supporter 5 so that the protuberances 10 may be fixed into the holes 20 and fused and united with each other by means of thermal welding.
  • the adjusting magnetic core 12 of the cap core 13 is inserted into the hole 11 of the core supporter 5. At the top of the cap core 13 another adjustment groove 14 is formed.
  • a shield case 15 wholly covers the resulting assembly including the members as shown in FIG. 2.
  • earth terminals 16 is formed and at the top of the shield case 15 an adjustment groove 19 corresponding to the groove 14 in the cap core 13 is formed.
  • one end of each of terminal pins 17 is buried in the terminal board member 1 and recesses 18 for lead line are provided for in the terminal board member 1.
  • the adjustment can be accomplished, when necessary, not only at the top of the transformer using the adjustment groove 14 of the cap core 13 but also at the bottom of the transformer using the adjustment groove 8 of the core supporter 5 through the tapping hole 2 in the terminal board member 1, and even if the miniaturized transformer is assembled on a printed-circuit board, for example in a miniature television receiver, definition of a through hole in the printed-circuit board will suflice for a satisfactory adjustment of the inductance of the transformer due to the fact that on either one of the two opposite sides of the transformer, i.e., through the adjustment groove 14 or 8 or both, inductance adjustment is possible.
  • miniaturization of a completed device can be attained.
  • the core supporter 5 is madeof a thermoplastic resin
  • the protuberances 10 are formed on the top 9 of the core supporter 5 and both are coupled by means of thermal welding after the protuberances 10 have been fixed in the holes 20, so that the assembly can be accomplished easily and fixedly.
  • the present invention can make a great contribution to the field of miniaturization of electronic devices.
  • a miniaturized high-frequency transformer comprising: a terminal board member having a through tapping hole at its center extending in its axial direction and coils wound on one end of said terminal board member; a core supporter having an adjustment groove at its closed end and a hole at its center extending in its axial direction and adapted to be in threaded engagement with said tapping hole of said terminal board member; a cap core having an adjustment groove at its closed end and an adjusting magnetic core at its center extending in its axial direction, said adjusting magnetic core being inserted into said hole in said core supporter; and a shield case covering the resulting assembly.
  • a high-frequency transformer as claimed in claim 1. in which said core supporter is made of a thermoplastic resin, at least two protuberances are formed at an open end of said core supporter so that said protuberances are fixed into holes prepared at said closed end of said cap core the number of which corresponds to the number of protuberances, and said core supporter and said cap core are coupled with each other by means of thermal welding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
US823271A 1968-05-21 1969-05-09 Miniaturized high-frequency transformer Expired - Lifetime US3528047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968043032U JPS4712731Y1 (de) 1968-05-21 1968-05-21

Publications (1)

Publication Number Publication Date
US3528047A true US3528047A (en) 1970-09-08

Family

ID=12652578

Family Applications (1)

Application Number Title Priority Date Filing Date
US823271A Expired - Lifetime US3528047A (en) 1968-05-21 1969-05-09 Miniaturized high-frequency transformer

Country Status (5)

Country Link
US (1) US3528047A (de)
JP (1) JPS4712731Y1 (de)
DE (1) DE1925404A1 (de)
FR (1) FR2008964B1 (de)
GB (1) GB1260243A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001853A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Tunable-inductance magnetically-soft ferrite core structures and methods of manufacture
EP0108305A1 (de) * 1982-11-08 1984-05-16 Kaschke KG GmbH & Co. Spulenkörperanordnung für eine abgleichbare Spule
US5432493A (en) * 1993-03-05 1995-07-11 Lucas Industries Public Limited Company Two linear differential transformers with armature
US20170243693A1 (en) * 2016-02-24 2017-08-24 Sumida Corporation Coil part and method of manufacturing coil part

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510298A1 (fr) * 1981-07-21 1983-01-28 Europ Composants Electron Procede de fabrication d'une inductance et pot comportant ladite inductance

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318415A (en) * 1939-07-31 1943-05-04 Gen Electric High-frequency iron core
US2435630A (en) * 1945-06-02 1948-02-10 Automatic Mfg Corp Tuned transformer assembly
US2717984A (en) * 1951-12-27 1955-09-13 Bell Telephone Labor Inc Adjustable inductance device
US2823359A (en) * 1954-06-01 1958-02-11 Rca Corp Miniature intermediate-frequency transformer
US3227980A (en) * 1963-02-27 1966-01-04 Trw Inc Variable inductor employing spaced magnetic hubs
US3309640A (en) * 1964-06-10 1967-03-14 Oshima Musan Co Ltd High-frequency core device with relatively movable cores

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1005549A (fr) * 1947-08-06 1952-04-11 Embarcation à flotteurs
GB931862A (en) * 1959-04-02 1963-07-17 Plessey Co Ltd Improvements in or relating to radio frequency transformers
US3155895A (en) * 1960-04-20 1964-11-03 Adams Electronics Inc Coil assembly with threaded stem core
FR1305711A (fr) * 1961-10-23 1962-10-05 Vogt & Co K G Noyau à vis pour inductances réglables, et procédé pour sa fabrication

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318415A (en) * 1939-07-31 1943-05-04 Gen Electric High-frequency iron core
US2435630A (en) * 1945-06-02 1948-02-10 Automatic Mfg Corp Tuned transformer assembly
US2717984A (en) * 1951-12-27 1955-09-13 Bell Telephone Labor Inc Adjustable inductance device
US2823359A (en) * 1954-06-01 1958-02-11 Rca Corp Miniature intermediate-frequency transformer
US3227980A (en) * 1963-02-27 1966-01-04 Trw Inc Variable inductor employing spaced magnetic hubs
US3309640A (en) * 1964-06-10 1967-03-14 Oshima Musan Co Ltd High-frequency core device with relatively movable cores

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001853A1 (en) * 1982-11-05 1984-05-10 Spang Ind Inc Tunable-inductance magnetically-soft ferrite core structures and methods of manufacture
US4558295A (en) * 1982-11-05 1985-12-10 Spang & Company Tunable-inductance magnetically-soft ferrite core structures
EP0108305A1 (de) * 1982-11-08 1984-05-16 Kaschke KG GmbH & Co. Spulenkörperanordnung für eine abgleichbare Spule
US5432493A (en) * 1993-03-05 1995-07-11 Lucas Industries Public Limited Company Two linear differential transformers with armature
US20170243693A1 (en) * 2016-02-24 2017-08-24 Sumida Corporation Coil part and method of manufacturing coil part
CN107123519A (zh) * 2016-02-24 2017-09-01 胜美达集团株式会社 线圈部件及线圈部件的制造方法
US10109412B2 (en) * 2016-02-24 2018-10-23 Sumida Corporation Coil part and method of manufacturing coil part
CN107123519B (zh) * 2016-02-24 2018-12-14 胜美达集团株式会社 线圈部件及线圈部件的制造方法

Also Published As

Publication number Publication date
FR2008964A1 (de) 1970-01-30
FR2008964B1 (de) 1974-05-24
DE1925404B2 (de) 1970-09-10
GB1260243A (en) 1972-01-12
JPS4712731Y1 (de) 1972-05-11
DE1925404A1 (de) 1969-12-04

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