GB1381888A - Pickup cartridge - Google Patents

Pickup cartridge

Info

Publication number
GB1381888A
GB1381888A GB257272A GB257272A GB1381888A GB 1381888 A GB1381888 A GB 1381888A GB 257272 A GB257272 A GB 257272A GB 257272 A GB257272 A GB 257272A GB 1381888 A GB1381888 A GB 1381888A
Authority
GB
United Kingdom
Prior art keywords
armature
pickup
yokes
yoke
polepieces
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
GB257272A
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
Priority to JP46008791A priority Critical patent/JPS4937527B1/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1381888A publication Critical patent/GB1381888A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00Transducers of moving-armature or moving-core type
    • H04R11/08Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R11/12Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Abstract

1381888 Moving magnet gramophone pickups MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 19 Jan 1972 [23 Feb 1971] 2572/72 Heading H4J A pickup (Fig. 2a) has a flat plate permanent magnet armature 7 magnetized in the same polarity (N) on both major surfaces and in the opposite polarity (S) at the central plane between the two major surfaces. The armature 7 is supported at its centre of gravity 14 and is movable together with a cantilever stylus arm 26 in all angular directions about its centre of gravity. A U-shaped yoke of high permeability magnetic material has a pair of polepieces 16, 17 adjacent and astride the armature 7. A coil 18 is wound on it. As the stylus 25 tracks a record the armature 7 moves closer to one or other of the polepieces 16, 17 (Figs. 3a to 3c, not shown), thereby inducing an E.M.F. in the coil 18. A support 11 having a portion 10 of reduced diameter is coaxial with the cantilever stylus arm 26. The portion 10 is of phosphor bronze wire or plastics material and is embraced by a butyl rubber damping sleeve (not shown). The armature 7 is made of two magnetized plates of barium ferrite or platinum cobalt bonded together. It is provided with a central hole for receiving cantilever stylus arm 26. The armature 7 may be of circular or semicircular form or of cruciform or V-shape. Only part of the armature 7 (e.g. a semicircle) may be magnetized. As shown in Fig. 2a a monaural pickup has the yoke 15 vertical. Another monaural pickup (Fig. 7b) has two yokes 15a, 15b arranged one on each side of the armature 7, their coils 18a, 18b being connected in series. Each arm of each yoke 15a, 15b may carry a coil. A first stereophonic pickup (Fig. 2b) is generally similar to the pickup of Fig. 2a but has two yokes 15L, 15R at 45 degrees to the vertical. An alternative stereophonic pickup (Figs. 8a, 8b, not shown) has two yokes below the armature 7 as well as the two yokes above it. Appropriate coils are connected in series and there may be two coils on each yoke, one on each limb, i.e. 8 coils altogether. Another stereophonic pickup (Fig. 6) has yokes 15L and 15R including polepieces 16L, 17L, 17R. The yoke-coil unit is in a shield case 19 of "permalloy" fixed on a housing 20. The vibration system is removably fitted in a holder 22. A butyl rubber damper 23 interposed between the armature 7 and the support 11 controls the vibration system which is attached from under the yokes 15R and 15L at an appropriate tracking angle. The shape of the damper 23 is such that the armature 7 is not displaced towards the polepieces 16L, 16R, 17L 17R because of the static bias force due to the stylus pressure.
GB257272A 1971-02-23 1972-01-19 Pickup cartridge Expired GB1381888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP46008791A JPS4937527B1 (en) 1971-02-23 1971-02-23

Publications (1)

Publication Number Publication Date
GB1381888A true GB1381888A (en) 1975-01-29

Family

ID=11702672

Family Applications (1)

Application Number Title Priority Date Filing Date
GB257272A Expired GB1381888A (en) 1971-02-23 1972-01-19 Pickup cartridge

Country Status (5)

Country Link
US (1) US3763335A (en)
JP (1) JPS4937527B1 (en)
CA (1) CA952823A (en)
FR (1) FR2126218B1 (en)
GB (1) GB1381888A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630253A (en) * 1977-12-23 1986-12-16 Alps Electric Co., Ltd. Electromagnetic pickup cartridge having elongate core elements

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2235484C2 (en) * 1972-07-20 1974-08-29 Electroacustic Gmbh, 2300 Kiel Electromagnetic pickup
US3878342A (en) * 1972-08-18 1975-04-15 Fonofilm Ind A S Replaceable stylus for stereophonic phonograph pickup
DE2303455C3 (en) * 1973-01-25 1975-12-18 Karl 8399 Rotthalmuenster Braun Record pickups
JPS5122362B2 (en) * 1973-11-27 1976-07-09
JPS5123893B2 (en) * 1974-06-11 1976-07-20
US4031336A (en) * 1975-02-10 1977-06-21 Grado Joseph F Electromagnetic pickup with magnetic gap displacement generator
US4072823A (en) * 1975-06-06 1978-02-07 Kabushiki Kaisha Mitachi Onkyo Seisakusho Moving magnet pickup cartridge
US4209669A (en) * 1977-12-23 1980-06-24 Nippon Columbia Kabushikikaisha Pick-up cartridge
US4524439A (en) * 1980-04-08 1985-06-18 Victor Company Of Japan, Limited Electromagnetic pickup cartridge with flux sensors mounted above moving magnet
US4320487A (en) * 1980-09-23 1982-03-16 Rca Corporation Video disc stylus control apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE476263A (en) * 1946-06-21
CH478502A (en) * 1967-06-20 1969-09-15 Audio Technica Kk Pickup head for stereophonic record playback
US3627931A (en) * 1968-01-23 1971-12-14 Nippon Columbia Moving magnet type stereo pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630253A (en) * 1977-12-23 1986-12-16 Alps Electric Co., Ltd. Electromagnetic pickup cartridge having elongate core elements

Also Published As

Publication number Publication date
DE2208292A1 (en) 1972-09-07
JPS4937527B1 (en) 1974-10-09
CA952823A (en) 1974-08-13
FR2126218B1 (en) 1976-01-16
US3763335A (en) 1973-10-02
DE2208292B2 (en) 1976-05-26
FR2126218A1 (en) 1972-10-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee