GB302190A - Improvements in sound-reproducing instruments - Google Patents

Improvements in sound-reproducing instruments

Info

Publication number
GB302190A
GB302190A GB18410/27A GB1841027A GB302190A GB 302190 A GB302190 A GB 302190A GB 18410/27 A GB18410/27 A GB 18410/27A GB 1841027 A GB1841027 A GB 1841027A GB 302190 A GB302190 A GB 302190A
Authority
GB
United Kingdom
Prior art keywords
armature
stylus
pole
extensions
arm
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
GB18410/27A
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.)
COLUMBIA GRAPHOPHONE CO Ltd
Original Assignee
COLUMBIA GRAPHOPHONE 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 COLUMBIA GRAPHOPHONE CO Ltd filed Critical COLUMBIA GRAPHOPHONE CO Ltd
Priority to GB2407028A priority Critical patent/GB302216A/en
Priority to GB18410/27A priority patent/GB302190A/en
Priority to US289846A priority patent/US1944258A/en
Publication of GB302190A publication Critical patent/GB302190A/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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02Arrangements of heads
    • G11B3/10Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/30Supporting in an inoperative position
    • G11B3/31Construction of arms

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Moving Of Heads (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

302,190. Columbia Graphophone Co., Ltd., and Mitchell, F. A. July 11, 1927. Electric sound-boxes ; sound-boxes, mounting ; tool-arms.-Relates to a gramophone pick-up of the kind comprising a U or like shaped permanent or electro field magnet having four pole extensions and an armature mounted on a pivot situated within the space bounded by the pole extensions, and consists in an arrangement in which the axis of the armature pivot lies approximately in the plane of the field magnet and the, pole extensions overlap one another at their extremities. In the construction shown in Figs. 1 and 2 a magnet M, mounted within a casing C is provided with pole pieces N, S, each of which is formed with a pair of extensions N<1>, N<2> and S<1>, S<2>, the end of the extensions overlapping one another to form magnetic air gaps in which the ends of the armature A is located. The armature, which is formed in one with the stylus holder H, is pivotally mounted on the pole pieces by means of flat spring members P<1>, P<2>, the planes of which are at right angles to or otherwise intersect one another. The armature is surrounded by a coil D which is wound on a bobbin D<1> cut away on two opposite sides, preferably as shown in Fig. 5. The armature may be damped by means such as described in Specification 269,978 and comprising rubber &c. pads R, R<\> one or both of which may be adjustable. The stylus K may be held in the holder H without the usual screw grip as described in Specification 302,216. If necessary, a small spring H may be provided for preventing the stylus falling out when not reproducing, or the stylus may be retained by the magnetic, attraction of the pole-pieces N<1>, S'. The inner end H<3> of the needle hole may be inclined to guide the stylus into its correct position when placed on a record and mav also contain a rubber &c. damping pad. Fig. 8 shows the preferred means for connecting the reproducing device with the associated amplifier, the coil D being connected by leads L, L<1> to an auto-transformer E which in. turn is connected to the input transformer F of the amplifier through the regulating contact arm E<1>. Shunting or blocking condensers G, G<1> may be provided as shown so that it is possible to shunt the high-frequencies by means of the condenser G or to block the low frequencies by means of the condenser G<1>. Figs. 9and 10 show a modified form of pick-up in which the upper end A<3> of the armature is arranged close to but not between the upper pole extensions N<2>, S<2> and the combined armature and stylus holder is mounted upon ball bearings as described in Specification 298,685. One of the leads L from the coil D is attached to the metal case C by a screw C<1> whilst the other lead L<3> passes out of the case as shown. The case C is eccentrically pivoted, as shown in Fig. 12, in the forked member J which is mounted on the arm O pivoted at O<1> to the cabinet U. The lead L<3> is connected through the arm O to the lead L whilst the case C is connected to the lead L', the fork J being secured to, but insulated from, the arm O by the clamping screw O<3>, insulating washer J<2> and rubber tube O<2>. Thus, when the reproducing unit is in operation on a record disc W as shown in full lines in Fig. 12, the electrical impulses are conveyed along the two metallic paths C, J, L<1> and L<3>, O, L to the amplifier, but when the unit is thrown back into the rest position C<2> it touches the screw head O<3> and thereby shortcircuits the leads L, L'. Instead of mounting the unit on the arm O it may be supported on two or more link members or arms as described in Specification 300,704.
GB18410/27A 1927-07-11 1927-07-11 Improvements in sound-reproducing instruments Expired GB302190A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2407028A GB302216A (en) 1927-07-11 1927-07-11 Improvements in sound-reproducing instruments
GB18410/27A GB302190A (en) 1927-07-11 1927-07-11 Improvements in sound-reproducing instruments
US289846A US1944258A (en) 1927-07-11 1928-07-02 Sound reproducing instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18410/27A GB302190A (en) 1927-07-11 1927-07-11 Improvements in sound-reproducing instruments

Publications (1)

Publication Number Publication Date
GB302190A true GB302190A (en) 1928-12-11

Family

ID=10111972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18410/27A Expired GB302190A (en) 1927-07-11 1927-07-11 Improvements in sound-reproducing instruments

Country Status (2)

Country Link
US (1) US1944258A (en)
GB (1) GB302190A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190056803A1 (en) * 2017-08-17 2019-02-21 Apple Inc. Touch sensor excitation using transformer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498211A (en) * 1945-12-29
US2543655A (en) * 1947-03-11 1951-02-27 Soundscriber Corp Recording pickup having torsion rods
US2581511A (en) * 1947-12-31 1952-01-08 Donald J Baker Magnetic phonograph pickup
US3038037A (en) * 1958-01-29 1962-06-05 Mc Graw Edison Co Recording machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190056803A1 (en) * 2017-08-17 2019-02-21 Apple Inc. Touch sensor excitation using transformer
US10585502B2 (en) * 2017-08-17 2020-03-10 Apple Inc. Touch sensor excitation using transformer

Also Published As

Publication number Publication date
US1944258A (en) 1934-01-23

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