GB1461979A - Magnetic tape cassette especially a compact cassette with screening shield - Google Patents

Magnetic tape cassette especially a compact cassette with screening shield

Info

Publication number
GB1461979A
GB1461979A GB1719374A GB1719374A GB1461979A GB 1461979 A GB1461979 A GB 1461979A GB 1719374 A GB1719374 A GB 1719374A GB 1719374 A GB1719374 A GB 1719374A GB 1461979 A GB1461979 A GB 1461979A
Authority
GB
United Kingdom
Prior art keywords
coil
strip
shield
magnetic tape
annealed
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
Application number
GB1719374A
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of GB1461979A publication Critical patent/GB1461979A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04Magazines; Cassettes for webs or filaments
    • G11B23/08Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
    • G11B23/087Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
    • G11B23/08707Details
    • G11B23/08792Shielding devices

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

1461979 Making magnetic tape cassettes BASF AG 19 April 1974 [21 April 1973] 17193/74 Heading B3A [Also in Division B8] Arcuate lengths 5 are cut from an annealed coil 9 of magnetic strip in a manner such as to retain in the cut lengths the magnetic properties of the annealed coil, and each length inserted into a magnetic tape cassette to act as a screening shield. The exemplified strip is a magnetically soft alloy containing 36% nickel sold under the Registered Trade Mark "Mumetal". A cleaning station (not shown) for the strip may be positioned between coil 9 and cutter 10. The coil is annealed at 600 to 1100‹ C. and a strip of protective material may be interposed between the turns of the coil to prevent them fusing together. The shield of Fig. la has a radius of curvature of 15 to 30 cm., a width of 8 to 10 mm. a thickness 0À2 to 0À4 mm. and a length of 22 mm. The ends of shield 1, Fig. 1b are angled towards the centre of curvature.
GB1719374A 1973-04-21 1974-04-19 Magnetic tape cassette especially a compact cassette with screening shield Expired GB1461979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732320439 DE2320439B2 (en) 1973-04-21 1973-04-21 MAGNETIC TAPE CASSETTE, IN PARTICULAR COMPACT CASSETTE, WITH SHIELD BAR AND METHOD FOR ITS MANUFACTURING

Publications (1)

Publication Number Publication Date
GB1461979A true GB1461979A (en) 1977-01-19

Family

ID=5878914

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1719374A Expired GB1461979A (en) 1973-04-21 1974-04-19 Magnetic tape cassette especially a compact cassette with screening shield

Country Status (8)

Country Link
JP (2) JPS5651060A (en)
BE (1) BE813978A (en)
BR (1) BR7403156D0 (en)
DE (1) DE2320439B2 (en)
FR (1) FR2226721B1 (en)
GB (1) GB1461979A (en)
IT (1) IT1011251B (en)
NL (1) NL176503C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835459A1 (en) * 1978-08-12 1980-02-28 Vacuumschmelze Gmbh SPRING SHIELDING ELEMENT, ESPECIALLY FOR MAGNETIC TAPE CASSETTES
JPS60199592A (en) * 1984-03-23 1985-10-09 Nomura Shoji:Kk Hydraulic clamp for welding of pipes

Also Published As

Publication number Publication date
IT1011251B (en) 1977-01-20
FR2226721B1 (en) 1978-03-24
JPS5651060A (en) 1981-05-08
JPS5758273A (en) 1982-04-07
NL176503C (en) 1985-04-16
NL176503B (en) 1984-11-16
NL7405362A (en) 1974-10-23
JPS5751188B2 (en) 1982-10-30
DE2320439B2 (en) 1977-02-10
BR7403156D0 (en) 1974-11-19
FR2226721A1 (en) 1974-11-15
JPS5751189B2 (en) 1982-10-30
BE813978A (en) 1974-10-21
DE2320439A1 (en) 1974-11-07

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940418