GB1486778A - Stereo disc cutter - Google Patents

Stereo disc cutter

Info

Publication number
GB1486778A
GB1486778A GB2281874A GB2281874A GB1486778A GB 1486778 A GB1486778 A GB 1486778A GB 2281874 A GB2281874 A GB 2281874A GB 2281874 A GB2281874 A GB 2281874A GB 1486778 A GB1486778 A GB 1486778A
Authority
GB
United Kingdom
Prior art keywords
coil
rods
secured
stylus
rod
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
GB2281874A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2281874A priority Critical patent/GB1486778A/en
Priority to GB880177A priority patent/GB1565279A/en
Publication of GB1486778A publication Critical patent/GB1486778A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R9/16—Gramophone pick-ups using a stylus; Recorders using a stylus signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Surgical Instruments (AREA)

Abstract

1486778 Stereophonic record cutters J MARTIN 29 Jan 1975 [22 May 1974] 22818/74 Heading H4J A stereophonic cutter of the moving coil type has a cutting stylus holder 18 connected by two rods 20, mutually at right angles, to respective moving coils 16 in the air gaps of magnetic circuits 12, 14. Each magnetic circuit uses an annular permanent magnet 22 and polepieces 24 and 26. Each polepiece 24 has a central boss 24a embraced by a coil 16. Each coil 16 consists of a windings impregnated with epoxy resin and may have a main driving winding and a feedback winding. Feedback signals from the feedback windings are amplified by a directly coupled amplifier and are fed back to the input of the stereo signal power amplifier. Each boss 24a has a bore 24b in which is secured a rod 20 by silicone rubber 32. The remainder of the bore 24b is filled with silicone grease. A cross-shaped member 30 is adhered to each rod 20 and the outer ends of its legs 30b are secured to the coil. A connecting tube (not shown) may be provided between the member 30 and coil 16. A damper 34 surrounds the otherwise open parts of the rods 20. This includes a support plate 36 (Fig. 2) fixed to a back plate (not shown) to which the magnetic circuits 12 and 14 are also fixed. L- shaped brackets 40 on opposite sides of the rods 20 are held to support plate 36 by screws 42 and damping layers 44. A screw 46 varies the distance apart of the brackets 40 and hence the compression of layers 44. The rods 20 are of stainless steel (e.g. hypodermic needles), stylus holder 18 is of aluminium and the cross-shaped members 30 are of hard laminated plastics material. An alternative embodiment (Fig. 3, not shown) has each feedback coil (52) stationary and physically separated from the main driving coil (54) and co-operates with a solid metal armature (56) secured to its respective rod 20 and cross-shaped member 30. The stylus holder (60) is provided with a tapered threaded portion (60a) for receiving the stylus and a tapered nut (62) for co-operation with the threaded portion (60a) to securely clamp the stylus. A torsion rod (64) secured to the rods 20 or stylus holder and to the back plate 38 further assists damping of the rods 20.
GB2281874A 1975-01-29 1975-01-29 Stereo disc cutter Expired GB1486778A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2281874A GB1486778A (en) 1975-01-29 1975-01-29 Stereo disc cutter
GB880177A GB1565279A (en) 1975-01-29 1977-03-02 Disc cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2281874A GB1486778A (en) 1975-01-29 1975-01-29 Stereo disc cutter

Publications (1)

Publication Number Publication Date
GB1486778A true GB1486778A (en) 1977-09-21

Family

ID=10185552

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2281874A Expired GB1486778A (en) 1975-01-29 1975-01-29 Stereo disc cutter

Country Status (1)

Country Link
GB (1) GB1486778A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002955A1 (en) * 1977-12-29 1979-07-11 Ortofon Manufacturing A/S A moving-coil pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002955A1 (en) * 1977-12-29 1979-07-11 Ortofon Manufacturing A/S A moving-coil pickup

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee