Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
  • G11B3/58—Cleaning record carriers or styli, e.g. removing shavings or dust or electrostatic charges
  • G11B3/5809—Cleaning record carriers or styli, e.g. removing shavings or dust or electrostatic charges during transducing operation
  • G11B3/5818—Cleaning record carriers or styli, e.g. removing shavings or dust or electrostatic charges during transducing operation for record carriers
  • G11B3/5854—Cleaning record carriers or styli, e.g. removing shavings or dust or electrostatic charges during transducing operation for record carriers using means not contacting the record carrier
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
  • H05F3/00—Carrying-off electrostatic charges
  • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices

Definitions

• the invention concerns the alleviation of the adverse effects of electrostatic charges present on gramophone 5. records.
• th ' e positively 15. charged and negatively charged ions are emitted by respective emission means, and are emitted continuously ' and simultaneously by such means.
• the invention also includes apparatus for practising the method as aforesaid and which comprises emission means 20. adapted to create positively charged and negatively charged ions.
• Fig. 1 is a diagrammatic side elevation of a device constructed in accordance with the invention as positioned for use relative to a record disc on a gramophone turntable;
• Fig. 2 is a perspective view of the device shown in
• Fig. 1; and Fig. 3 is a diagrammatic perspective view of the 5. pins of the device of Figs. 1 and 2.
• a device for the neutralisation or substantial neutralisation of the electrostatic field arising from an electrostatic charge 10. at the surface of a record disc 11 on a gramophone turn ⁇ table 12 comprises spaced electrodes 13, 14 arranged in side-by-side disposition within a box 15 mounted adjacen the said turntable, the electrodes 13, 14 being connecte with respective high voltage sources via leads 16, 17. 15.
• the electrodes 13, 14 each comprise a pin of 38*s gauge wire, such pins being approximately two and a half centimetres long and being mounted in parallel dispositi at one and a half centimetres centres in a perspex block to extend forwardly therefrom by approximately three- 20. quarters of their length.
• the rearward ends of the pins are connected with the respective leads 16, 17 directl adjacent the back of the block.
• the box 15, which box is conveniently fabricated from synthetic plastics material, for example ABS, is of 25. rectangular form, and has a window at its forward end, the pins being arranged perpendicular to the plane of the window and the perspex block being secured to the box with the forward ends of the pins positioned rear- wardly of the window respectively to emit positive and 30. negative ions therethrough.
• such box is mounted on a base plate 18 by means of an articulated linkage 19, such linkage being so connected 35. with the base plate 18 or box 15 as to provide for a relative rotation between the box and base plate if desired.
• the device may be free-standing relative to the turntable 12 or may be secured in position relative thereto, the base plate in the former case, preferably 5. being weighted for stability purposes.
• the device is positioned adjacent the periphery of the record disc 11, say two and a half centimetres from the line of such periphery, with the common plane of the electrodes 13, 14 approximately
• the electrodes 13, 14 are connected with a positive source of 4.43 KV and a negative source of 3.55 KV respectively.
• the electrode emitting the positive ions is preferably placed forwardly of that electrode
• the pins be positioned to define a plane parallel to the plane of the record disc and slightly above such plane.
• the device as hereinbefore described represents a convenient, effective and aesthetically 5. pleasing structure for reducing contamination of the playing surface of the revolving disc by dust, for minimising variations in the weight trackability of the pick-up arm and stylus and for alleviating other problems arising from any electrostatic charge at the record
• arrangement there may be a row of from two to twelve pins arranged at say, two and a half centimetres centres for the emission of positive ions and a further similar row of pins for the emission of negative ions, the two rows being arranged in parallel disposition and lying in
• each emitter takes the form of a rod or wire arranged tangentially of the disc or
• wire lengths of between two and a half and thirty centimetres having given satisfactory results.

Landscapes

• Elimination Of Static Electricity (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9789569

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (1)

Citations (8)

• 1978
  • 1978-02-08 GB GB5089/78A patent/GB1596577A/en not_active Expired
• 1979
  • 1979-02-02 JP JP50032079A patent/JPS55500342A/ja active Pending
  • 1979-02-02 WO PCT/GB1979/000021 patent/WO1979000603A1/en unknown
  • 1979-02-05 NL NL7900896A patent/NL7900896A/nl not_active Application Discontinuation
  • 1979-02-07 BE BE193310A patent/BE873988A/xx unknown
  • 1979-02-08 IT IT20023/79A patent/IT1110419B/it active
  • 1979-08-28 EP EP79900136A patent/EP0010094A1/en not_active Withdrawn
  • 1979-10-05 DK DK420179A patent/DK420179A/da not_active Application Discontinuation

Patent Citations (8)

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