GB1245031A - Stereophonic gramophone pickup - Google Patents

Stereophonic gramophone pickup


Publication number
GB1245031A GB2107869A GB2107869A GB1245031A GB 1245031 A GB1245031 A GB 1245031A GB 2107869 A GB2107869 A GB 2107869A GB 2107869 A GB2107869 A GB 2107869A GB 1245031 A GB1245031 A GB 1245031A
United Kingdom
Prior art keywords
permanent magnet
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.)
Application number
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.)
Pickering and Co Inc
Original Assignee
Pickering and Co Inc
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 claimed from US72545768A external-priority
Application filed by Pickering and Co Inc filed Critical Pickering and Co Inc
Publication of GB1245031A publication Critical patent/GB1245031A/en
Expired legal-status Critical Current



    • 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


1,245,031. Stereophonic pick-ups. PICKERING & CO. Inc. 24 April, 1969 [30 April, 1968; 29 Jan., 1969], No. 21078/69. Heading H4J. A stereophonic pick-up (Fig. 5) comprises a supporting structure carrying a quadrangular cluster of four polepieces 33, 34, 46, 47 (Figs. 2, 7) which define a common space. A tubular armature 93 of high permeability material is pivotally mounted at one end outside the common space for movement of the opposite end within the common space. A permanent magnet 66 is mounted on the supporting structure and is magnetically coupled at one of its poles to the pivotally mounted armature 93. Its other end is remote from the magnetic circuitry. Relative motion between the permanent magnet 66 and armature 93 in the region of magnetic coupling is small and the armature 93 is maintained in a substantially uniform and constant state of magnetic saturation. The armature 93 is preferably mounted and damped by a flexible collar 94 of natural or synthetic rubber. Two magnetic circuits are provided, one for each channel. The right-hand channel circuit comprises polepiece 46, leg 44, coupling member 53, core member 31, coil 38 and polepiece 33. The left hand channel circuit comprises polepiece 47, leg 45, coupling member 53, core member 32, coil 40 and polepiece 34. A " shorted turn " non-magnetic member 35 for reducing cross-talk and providing a relatively flat frequency response electromagnetically couples the core members 31, 32 beneath the coils 38, 40 and may have two holes as shown or a single large hole (Fig. 13, not shown). An earthing strap 61 connects the magnetic circuits to a shielding casing 85. The quadrangular cluster of polepieces need not be in rightangled configuration (Fig. 12, not shown). The permanent magnet 66 may be cemented in position or its channel housing (Fig. 11, not shown) may be provided with a window (200) in the base of the channel and a wall (201) at the front of the channel. The magnet is inserted between the wall (201) and the base and held by projections (202, 203). A removable stylus assembly comprises a tubular casing 88 of non-magnetic material having a handle 90 which provides positive location relative to the shielding casing 85. A springy metal tie wire 95 between the easing 88 and armature 93 allows pivoting of the armature 95. The pick-up supporting structure is in two moulded interfitting parts, the first part accommodating the magnetic circuit arrangements apart from the permanent magnet which is accommodated in the second part (Fig. 3, not shown).
GB2107869A 1968-04-30 1969-04-24 Stereophonic gramophone pickup Expired GB1245031A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72545768A 1968-04-30 1968-04-30
US79492169A 1969-01-29 1969-01-29

Publications (1)

Publication Number Publication Date
GB1245031A true GB1245031A (en) 1971-09-02



Family Applications (1)

Application Number Title Priority Date Filing Date
GB2107869A Expired GB1245031A (en) 1968-04-30 1969-04-24 Stereophonic gramophone pickup

Country Status (8)

Country Link
JP (1) JPS5425401B1 (en)
BE (1) BE732277A (en)
CH (1) CH510923A (en)
DE (1) DE1921927C3 (en)
DK (1) DK129610C (en)
FR (1) FR2007302A1 (en)
GB (1) GB1245031A (en)
NL (1) NL168390C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646279A (en) * 1970-12-07 1972-02-29 Pickering & Co Inc Induced magnetic moving iron stereophonic phonograph pickup with replaceable stylus assembly and one common pole piece
DE3228299A1 (en) * 1982-07-29 1984-02-02 Philips Patentverwaltung Gmbh, 2000 Hamburg CARTRIDGES FOR READING INFORMATION FROM THE ROLL OF A ROTATING INFORMATION CARRIER DISK

Also Published As

Publication number Publication date
DK129610B (en) 1974-10-28
DE1921927C3 (en) 1980-10-16
NL168390C (en) 1982-03-16
DE1921927A1 (en) 1969-11-20
BE732277A (en) 1969-10-29
CH510923A (en) 1971-07-31
FR2007302A1 (en) 1970-01-02
NL6905490A (en) 1969-11-03
DK129610C (en) 1975-05-05
NL168390B (en) 1981-10-16
DE1921927B2 (en) 1980-02-07
JPS5425401B1 (en) 1979-08-28

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