US3771797A - Guide for phono-pick-up - Google Patents

Guide for phono-pick-up Download PDF

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Publication number
US3771797A
US3771797A US00113579A US3771797DA US3771797A US 3771797 A US3771797 A US 3771797A US 00113579 A US00113579 A US 00113579A US 3771797D A US3771797D A US 3771797DA US 3771797 A US3771797 A US 3771797A
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US
United States
Prior art keywords
guidepiece
guideway
magnetic
pick
guide
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 - Lifetime
Application number
US00113579A
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English (en)
Inventor
K Braun
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Individual
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Individual
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Publication date
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Publication of US3771797A publication Critical patent/US3771797A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00—Relieving load on bearings
    • F16C39/06—Relieving load on bearings using magnetic means
    • F16C39/063—Permanent magnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/0408—Passive magnetic bearings
    • F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
    • F16C32/0434—Passive magnetic bearings with permanent magnets on both parts repelling each other for parts moving linearly
    • 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
    • G11B3/02—Arrangements of heads
    • G11B3/08—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
    • G11B3/09—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers using manual means only
    • 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
    • G11B3/02—Arrangements of heads
    • G11B3/08—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
    • G11B3/09—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers using manual means only
    • G11B3/092—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers using manual means only using mechanical means
    • 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
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • 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
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse
    • G11B3/125—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by using electric or magnetic means
    • 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
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/34—Driving or guiding during transducing operation
    • G11B3/38—Guiding, e.g. constructions or arrangements providing linear or other special tracking characteristics

Definitions

  • GUIDE FOR PHONO-PICK-UP This invention relates to a guide fora phono-pick-up the needle of which traverses a record radially thereof.
  • Stencils for records are cut by movement of the cutting stylus radially on'the record stencil.
  • the phono -pick-up for sound reproduction is customarily guided by a pick-up arm on a pivot support so that its needle does not move in a linear path, but moves in a circular path.
  • wrong angle positions between the tangent of therecord' groove and the longitudinal axis of the phono-pick-up will form varying angles which cause sound distortions.
  • an additional force urges the needle against the inner groove flank so that with stereo-edge writing in both channels different contact pressures prevail which causes still further distortion of sound reproduction.
  • this. is obtained in that the guide is arrangedto actmagnetically for holding the phono-pick-up suspended in free hovering fashion for movement in radial direction without encountering any friction from the guide. In so doing, all physical contact between the guiding and guided parts is eliminated.
  • the contemplated guide provides a longitudinal, and in this instance a rectilinear, guideway with a magnetic field in which the phono-pick-up, and more particularly a follower magnet thereof, is held freely suspended and encounters no magnetic resistance to its operational linear movements in the guideway instigated by the needle.
  • a magnetic guideway requires but a minimum of parts and functions satisfactorily.
  • FIG. 1 shows an embodiment of a longitudinal guide operating with magnetic repulsion forces
  • FIG. 2 is an end view of the guide
  • FIG. 3 is an enlarged end view of the guide, with the magnetic polarities indicated;
  • FIG. 4 is a side view of a phono-pick-up together with its follower magnet
  • FIG. 5 is an end view of the phono-pick-up
  • FIG. 6 is a schematic view of the magnetic guide according to the invention in combination with a conventional'phonograph.
  • FIG. 7 is a top view of the overall device of FIG. 6.
  • the reference numeral I designates a guideway which comprises a permanent magnet 3, and opposite ferromagnetic pole pieces or shoes 4 and 4, and in which is received a guidepiece in the form of a hovering magnet 2, which is also a permanent magnet that carries the pick-up.
  • Magnets 2 and 3 preferably consist of a material which can be magnetized in any direction, for example, oxide-ceramics. With the polarity of the magnets as shown in FIG. 3, 'magnet 2 is held hovering, by magnetic repulsive forces, in the guideway between the pole shoes 4 and 4'. The magnetic forces in the direction AA (FIG. I) cancel each other out as long as the magnet 2 is entirely within the longitudinal confines of the magnetic guideway 1.
  • the follower magnet 2 in the guideway I confines the operational movements of the phono-pick-up to movement in the direction A-A (FIG. 1) or in thedirection B (FIGS. 5 and 7) without encountering any friction.
  • FIG. 4 there is shown an arm whichat 6 is pivoted in a bearing 5 on thefollower magnet 2. Carried at one end of this arm A 7 is a pick-up box 8 with the needle 9, and carried at the opposite end of this arm is a counter weight 10 which is preferably adjustable. Adjustment of the counter weight 10 permits regulation of the needle pressure on a record, as will be readily understood. Because of the pivotal mount of the phono-pick-up on the bearing 5 on the follower magnet 2, the phono-pick-up will readily follow the slight planar deviations of nearly.
  • the phono-pick-up' is. fed byand under the control of a the record grooves, whereby-the same is by its follower magnet 2 guided in a free-of-contact movement in the direction B (FIGS. 5 and 7) within the magnetic guideway 1.
  • the guideway I extends parallel to the desired radial course of the needle on the record.
  • provisions are made whereby the magnet 2 is unable to move beyond either end of the magnetic guideway l, and will thus always remain in the magnetic guideway.
  • magnetic or mechanical endv stops of which exemplary non-magnetic, for example brass, stop pins 1a are shown in FIG. 1.
  • FIGS. 6 and 7 show a base 11 and a turntable 12 which is supported by bearing means 13, 18. Furthermore, the base 11 provides a bearing block 16 in which a bell crank 14 is pivoted at 15 so as to be swingable, by a handle 17, over in the direction of the arrow D.
  • the bell crank 14 carries the complete guide and phono-pick-up which, by pivoting of the bellcrank from the position shown in FIG. 6 in the direction D, can be swung from the turntable so as to permit recordchanging.
  • FIG. 7- indicates by arrow B the path of movement of the phono-pick-up, which is parallel to the record radius R, wherefore the needle follows the record radius R.
  • a guide for a phono-pick-up device having an arm carrying a needle and counterweight at opposite ends thereof, said arm being turnably supported about a pivot intermediate its ends, said guide comprising:
  • a magnetic guidepiece having a longitudinal axis and freely movable in the direction of its axis along said guideway
  • said guidepiece having oppositely facing pole pieces of opposite polarity
  • each pole piece of said guidepiece being spaced apart from, but configured to interlock with, an opposite polarity pole piece of said guideway, whereby there is only limited freedom of movement of said guidepiece, either laterally with respect to, or rotary about, its longitudinal axis;
  • said magnetic circuit means and said magnetic guidesaid guidepiece carrying said pivot on which said arm is turnably supported for permitting the needle on said arm to 'move in tracking relation with the spiral grooves in a record disc, with the needle being horizontally spaced from said guidepiece when tracking a record disc.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moving Of Heads (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
US00113579A 1970-02-06 1971-02-08 Guide for phono-pick-up Expired - Lifetime US3771797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2005331A DE2005331C3 (de) 1970-02-06 1970-02-06 Führungsvorrichtung für Tonabnehmer

Publications (1)

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US3771797A true US3771797A (en) 1973-11-13

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ID=5761557

Family Applications (1)

Application Number Title Priority Date Filing Date
US00113579A Expired - Lifetime US3771797A (en) 1970-02-06 1971-02-08 Guide for phono-pick-up

Country Status (4)

Country Link
US (1) US3771797A (de)
DE (1) DE2005331C3 (de)
DK (1) DK129881B (de)
GB (1) GB1354318A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114895A (en) * 1977-07-26 1978-09-19 Lewis Eckhart Phonograph tonearm pickup counterbalance
FR2444572A1 (fr) * 1978-12-23 1980-07-18 Mutoh Ind Ltd Regles paralleles universelles du type a rails
FR2444573A1 (fr) * 1978-12-23 1980-07-18 Mutoh Ind Ltd Regles paralleles universelles du type a rails
FR2518790A1 (fr) * 1981-12-21 1983-06-24 Karpov Valery Perfectionnements apportes aux bras de lecture pour electrophone
US4455641A (en) * 1978-09-12 1984-06-19 Dennesen Electrostatics, Inc. Linear tracking system
US4553230A (en) * 1984-08-20 1985-11-12 Paulson Rollie W Vibration free turntable apparatus
US5101398A (en) * 1988-02-19 1992-03-31 Canon Kabushiki Kaisha Device for magnetically guiding movement of a moving body such as an optical head
CN101988545A (zh) * 2009-08-06 2011-03-23 马明 磁悬浮轴承

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH613796A5 (en) * 1978-06-24 1979-10-15 John A Youngs Record player
DE3151948C2 (de) * 1981-12-30 1984-09-13 Valerij Georgievič Karpov Tangentialtonarm mit einer Schlittenführung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2413206A (en) * 1943-11-18 1946-12-24 Arthur F Worsham Pickup arm
US3101952A (en) * 1962-02-02 1963-08-27 James E Godfrey Tone-arm for a play-back sound reproducer
US3356372A (en) * 1964-12-09 1967-12-05 Rabinow Jacob Free-tracking phonograph pickup
US3441331A (en) * 1967-10-23 1969-04-29 Gen Motors Corp Gliding shelf

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2413206A (en) * 1943-11-18 1946-12-24 Arthur F Worsham Pickup arm
US3101952A (en) * 1962-02-02 1963-08-27 James E Godfrey Tone-arm for a play-back sound reproducer
US3356372A (en) * 1964-12-09 1967-12-05 Rabinow Jacob Free-tracking phonograph pickup
US3441331A (en) * 1967-10-23 1969-04-29 Gen Motors Corp Gliding shelf

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114895A (en) * 1977-07-26 1978-09-19 Lewis Eckhart Phonograph tonearm pickup counterbalance
US4455641A (en) * 1978-09-12 1984-06-19 Dennesen Electrostatics, Inc. Linear tracking system
FR2444572A1 (fr) * 1978-12-23 1980-07-18 Mutoh Ind Ltd Regles paralleles universelles du type a rails
FR2444573A1 (fr) * 1978-12-23 1980-07-18 Mutoh Ind Ltd Regles paralleles universelles du type a rails
US4312132A (en) * 1978-12-23 1982-01-26 Mutoh Industry, Ltd. Rail type universal parallel ruler device
FR2518790A1 (fr) * 1981-12-21 1983-06-24 Karpov Valery Perfectionnements apportes aux bras de lecture pour electrophone
US4553230A (en) * 1984-08-20 1985-11-12 Paulson Rollie W Vibration free turntable apparatus
US5101398A (en) * 1988-02-19 1992-03-31 Canon Kabushiki Kaisha Device for magnetically guiding movement of a moving body such as an optical head
CN101988545A (zh) * 2009-08-06 2011-03-23 马明 磁悬浮轴承

Also Published As

Publication number Publication date
GB1354318A (en) 1974-06-05
DE2005331C3 (de) 1973-01-04
DK129881B (da) 1974-11-25
DE2005331B2 (de) 1972-06-08
DE2005331A1 (de) 1971-08-19

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