WO1979000603A1 - Alleviating the effects of static charge on gramophone records - Google Patents

Alleviating the effects of static charge on gramophone records Download PDF

Info

Publication number
WO1979000603A1
WO1979000603A1 PCT/GB1979/000021 GB7900021W WO7900603A1 WO 1979000603 A1 WO1979000603 A1 WO 1979000603A1 GB 7900021 W GB7900021 W GB 7900021W WO 7900603 A1 WO7900603 A1 WO 7900603A1
Authority
WO
WIPO (PCT)
Prior art keywords
record
negatively charged
charged ions
ions
emitters
Prior art date
Application number
PCT/GB1979/000021
Other languages
French (fr)
Inventor
D Powell
D Chave
Original Assignee
Milty Prod Ltd
D Powell
D Chave
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 Milty Prod Ltd, D Powell, D Chave filed Critical Milty Prod Ltd
Publication of WO1979000603A1 publication Critical patent/WO1979000603A1/en
Priority to DK420179A priority Critical patent/DK420179A/en

Links

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)

Abstract

A method of and a means for alleviating the adverse effects of electrostatic charge and of the electrostatic field arising therefrom on a gramophone record during the playing thereof is proposed which involves the simultaneous emission both of positive and negative ions to the space above the record by respective emission electrodes (13, 14) disposed adjacent to the periphery of the record, there being a differential between the voltages applied to the respective emission electrodes and the positive electrode preferably being located in advance of the negative electrode in the direction of record rotation so as to be met first by any particular part of the disc periphery.

Description

ENHANCED SOUND REPRODUCTION TECHNICAL FIELD
The invention concerns the alleviation of the adverse effects of electrostatic charges present on gramophone 5. records.
DISCLOSURE OF THE INVENTION
According to the present invention there is proposed a method for the alleviation, during the playing of a record, of the adverse effects of the static charge on 10. the record and the electrostatic field arising from such charge, which method comprises the neutralisation or substantial neutralisation of the said field by means of positively and negatively charged ions.
According to a preferred feature, 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. BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further, by way of example only, with reference to the accompanying drawing 25. illustrating one embodiment thereof, and in which:-
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.
BEST MODE OF CARRYING OUT THE INVENTION
Referring now to the drawings, 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.
In order to provide for the ready vertical adjust¬ ment of the box relative to the plane of the record disc, 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.
In a typical situation 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
10. one and a quarter centimetres above the plane of the disc, and 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
15. emitting the negative ions in the direction of disc rotation so as to be met first by any particular part of the disc periphery, it having been found that such disposition gives an improved performance as compared with the alternative disposition.
20. We have found that by means of the device as herein¬ before described we are able to create a space above the revolving disc of substantially neutral charge, and accordingly are able effectively to inhibit the ingress of dust and the like to such space, and thus to the
25. surface of the record.
The disposition of the device in relation to the plane of the disc does not appear to be critical, and indeed advantageous effects have been achieved when the plane as defined by the pins is below the plane of the disc,
30. although it is preferred that the pins be positioned to define a plane parallel to the plane of the record disc and slightly above such plane.
It has been established that the pins will produce satisfactory effects if arranged one above the other,
35. rather than in the side-by-side disposition shown, and thus the invention is not to be considered limited to the disposition of pins shown.
Whilst 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
10. surface, such device represents but one of a variety of means embodying the invention.
Thus, for example, instead of providing a single pair of pins emitting positive or negative ions, alternative forms of emitter may be used. In one
15. 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
20. respective, planes parallel or perpendicular to the plane of the disc and, in the former case, tangential to such disc.
In another arrangement, each emitter takes the form of a rod or wire arranged tangentially of the disc or
25. perpendicular to the plane thereof and in spaced dis¬ position relative to the periphery of the disc, wire lengths of between two and a half and thirty centimetres having given satisfactory results.
It may be found convenient, and indeed economically
30. advantageous to build the device into the turntable deck, thereby minimising or eliminating the need for additional structure specifically to support the emitters.
Like voltages to those referred to in connection with the device illustrated in the drawing,, and indeed a
35. range of voltages at either side thereof, will give
O Pi substantial neutralisation of an electrostatic field arising from the disc surface to provide satisfactory results, although it may be that a lesser voltage differential as between the respective sources is 5. preferred.
Whilst the invention has been disclosed in the context of the simultaneous emission of positive and negative ions, such invention is not limited to simul¬ taneous emission in the sense of continuous emission
10. both of positive and negative ions at one and the same time as in the case of the embodiment hereindisclosed. In its broadest sense the inventive concept is seen to lie in the use both of positive and negative ions to neutralise the field arising from the electrostatic
15. charge present on the record.

Claims

._-_..-----' - .6 -
Claims:
1. A method for the alleviation, during the playing of a gramophone record, of the adverse effects of the static charge on the record, and of the electrostatic field
5. arising from such charge, the method comprising the neutralisation or substantial neutralisation of the said field by means of both positivel and negatively charged ions.
2. The method as claimed in claim 1, wherein the 10. positively and negatively charged ions are emitted simultaneously by respective emission means.
3. The method as claimed in claim 1 wherein positively and negatively charged ions are emitted continuously and simultaneously.
15. 4. The method as claimed in claim 1, wherein the source of ions is disposed adjacent the periphery of the record to emit an array of ions across the surface of the record
5. The method as claimed in claim 1, wherein positively charged and negatively charged ions are emitted from
20. respective emitters arranged in side-by-side disposition adjacent the periphery of the record, the positive ion emitter being positioned forwardly of the negative ion emitter in the direction of record rotation.
6. The method as claimed in claim 1, wherein a sub- 25. stantial voltage differential is maintained between the positive and negative ion emitters.
7. In or for a record player, apparatus for use in alleviating the adverse effects of the static charge on the record during the playing thereof which includes 30. emission means adapted to emit both positively charged and negatively charged ions to neutralise or substantiall to neutralise he electrostatic field arising from such static charge.
8. The apparatus as claimed in claim 7, wherein the 35. emission means comprise respective emitters for the positively charged and the negatively charged ions arranged in adjacent disposition.
9. The apparatus as claimed in claim 7 wherein the respective emitters are arranged in side-by-side dis-
5. position.
10. The apparatus as claimed in claim 7 wherein the emitter of positively charged ions is positioned forwardly of the emitter of the negatively charged ions in the direction of rotation of the gramophone record.
10. 11. The apparatus as claimed in claim 7 wherein the position of the emitters is adapted to be adjustable relative to the plane of the record.
12. Apparatus as claimed in claim 7 wherein the emitters are provided in a housing mountable adjacent the periphery
15. of the record.
13. Apparatus as claimed in claim 12, wherein the housing is angularly adjustable about an axis perpen¬ dicular to the plane of the record.
14. Apparatus as claimed in claim 7, wherein the housing 20. forms part of the structure of the record player.
15. A gramophone record player having a device for the alleviation, during the playing of the record, of the adverse effects of a static charge on the record and the electrostatic field arising from such charge as claimed
25. in claim 1 or operating in accordance with the method claimed in claim 1.
PCT/GB1979/000021 1978-02-08 1979-02-02 Alleviating the effects of static charge on gramophone records WO1979000603A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK420179A DK420179A (en) 1978-02-08 1979-10-05 METHOD AND DEVICE FOR MATERATING THE EFFECTS OF STATIC CHARGING ON GRAMPHONE RECORDS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5089/78 1978-02-08
GB5089/78A GB1596577A (en) 1978-02-08 1978-02-08 Enhanced sound reproduction from gramophone records

Publications (1)

Publication Number Publication Date
WO1979000603A1 true WO1979000603A1 (en) 1979-08-23

Family

ID=9789569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1979/000021 WO1979000603A1 (en) 1978-02-08 1979-02-02 Alleviating the effects of static charge on gramophone records

Country Status (8)

Country Link
EP (1) EP0010094A1 (en)
JP (1) JPS55500342A (en)
BE (1) BE873988A (en)
DK (1) DK420179A (en)
GB (1) GB1596577A (en)
IT (1) IT1110419B (en)
NL (1) NL7900896A (en)
WO (1) WO1979000603A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012612A1 (en) * 1990-12-26 1992-07-23 Eastman Kodak Company Web edge discharging system
WO2007122269A1 (en) * 2006-04-26 2007-11-01 B. Braun Melsungen Ag Manufacture and use of modified polysaccharide chitosan bonds and a process to improve the preparation of hes-medicinal substance compounds
TWI393484B (en) * 2007-11-02 2013-04-11 Hon Hai Prec Ind Co Ltd Apparatus and method for removing static electricity on surgaces of plastic productus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556795A (en) * 1982-11-19 1985-12-03 Ensign-Bickford Industries, Inc. Corona discharge device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR354294A (en) * 1905-05-15 1905-10-03 William Henry Chapman Process for removing static electricity from paper, wire and other materials
US2582939A (en) * 1947-04-15 1952-01-15 Dictaphone Corp Record chip removal apparatus
FR1229405A (en) * 1959-07-07 1960-09-07 Neutralization of electro-static charges by application of coercive fields
US3555378A (en) * 1967-05-15 1971-01-12 Commw Of Australia Charging xerographic images
FR2147997A1 (en) * 1971-07-30 1973-03-11 Eastman Kodak Co
US3942072A (en) * 1974-10-18 1976-03-02 Burlington Industries, Inc. Method and system for maintaining an electrically neutral atmosphere
US3968405A (en) * 1975-04-14 1976-07-06 Testone Anthony Quintin Static electricity suppressor with patterned coating and method of making
DE2632265B1 (en) * 1976-07-17 1977-11-24 Ruthard Marowsky Record player attachment removing electrostatic charges from record - has point sources of ionising radiation positioned over turntable

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR354294A (en) * 1905-05-15 1905-10-03 William Henry Chapman Process for removing static electricity from paper, wire and other materials
US2582939A (en) * 1947-04-15 1952-01-15 Dictaphone Corp Record chip removal apparatus
FR1229405A (en) * 1959-07-07 1960-09-07 Neutralization of electro-static charges by application of coercive fields
US3555378A (en) * 1967-05-15 1971-01-12 Commw Of Australia Charging xerographic images
FR2147997A1 (en) * 1971-07-30 1973-03-11 Eastman Kodak Co
US3942072A (en) * 1974-10-18 1976-03-02 Burlington Industries, Inc. Method and system for maintaining an electrically neutral atmosphere
US3968405A (en) * 1975-04-14 1976-07-06 Testone Anthony Quintin Static electricity suppressor with patterned coating and method of making
DE2632265B1 (en) * 1976-07-17 1977-11-24 Ruthard Marowsky Record player attachment removing electrostatic charges from record - has point sources of ionising radiation positioned over turntable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012612A1 (en) * 1990-12-26 1992-07-23 Eastman Kodak Company Web edge discharging system
US5400208A (en) * 1990-12-26 1995-03-21 Eastman Kodak Company Web edge discharging system
WO2007122269A1 (en) * 2006-04-26 2007-11-01 B. Braun Melsungen Ag Manufacture and use of modified polysaccharide chitosan bonds and a process to improve the preparation of hes-medicinal substance compounds
US8859724B2 (en) 2006-04-26 2014-10-14 B. Braun Melsungen Ag Manufacture and use of modified polysaccharide chitosan bonds and a process to improve the preparation of HES-medicinal substance compounds
TWI393484B (en) * 2007-11-02 2013-04-11 Hon Hai Prec Ind Co Ltd Apparatus and method for removing static electricity on surgaces of plastic productus

Also Published As

Publication number Publication date
BE873988A (en) 1979-05-29
GB1596577A (en) 1981-08-26
IT1110419B (en) 1985-12-23
DK420179A (en) 1979-10-05
JPS55500342A (en) 1980-06-19
EP0010094A1 (en) 1980-04-30
IT7920023A0 (en) 1979-02-08
NL7900896A (en) 1979-08-10

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