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US2868893A - Dual needle phonograph pick-up - Google Patents

Dual needle phonograph pick-up Download PDF

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Publication number
US2868893A
US2868893A US493220A US49322055A US2868893A US 2868893 A US2868893 A US 2868893A US 493220 A US493220 A US 493220A US 49322055 A US49322055 A US 49322055A US 2868893 A US2868893 A US 2868893A
Authority
US
United States
Prior art keywords
needle
pick
rigidity
damping
resilient
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
US493220A
Other languages
English (en)
Inventor
Lalesse Herman Cornelis
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2868893A publication Critical patent/US2868893A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
    • 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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R17/06—Gramophone pick-ups using a stylus; Recorders using a stylus comprising two or more styli or transducers

Definitions

  • the invention relates to pick-ups comprising at least two tracking needles, for example for use with normal and micro-groove disc records, which can be alternately rendered operative or inoperative and are each secured to a resilient needle holder, the said needle holders being connected via an armature to a common transforming element, while undesired movements of the needle holders are externally damped. It has been found that a needle holder which is inoperative during operation of the pick-up and consequently is connected to the entire system as a member supported at one end may be set into resonance due to the fa. that its natural frequency is attained.
  • the rigidity of the needle holder with respect to the pick-up housing determines the force necessarily required to be exerted sideways on the needle in order to obtain a predetermined deflection of the needle.
  • this force must be kept Within certain limits since when this limit is exceeded the needle tends to leave the groove along one of its walls under the action of the said force. This will be counteracted by the weight of the pick-up by which the needle is urged against one wall or both walls of the groove.
  • the resilient needle holders are intercoupled by means of a member consisting entirely or in part of damping material.
  • the total rigidity of the needle with respect to the pick-up tent C) Patented Jan. 13, P359 'ice housing substantially consists of the sum of the rigidities or the resilient needle holder, of the armature and of thcrystal about its torsion axis.
  • l ig. 1 is a cross-sectional view of a crystal pick-up in accordance with the invention, while Fig. 2 is a front elevation thereof in which the front face of the pick-up housing has been omitted.
  • reference numeral 1 desighates the housing of a crystal pick-up comprising two tracking needles 2 and 3 the first of which is operative while the latter is inoperative. Both needles, for example sapphires, are secured to resilient needle holders, for example the tracking needle 2 to the needle holder 4.
  • the needle holder is in turn connected via an armature 5 to a common crystal 6. This crystal is gripped in the housing 1 at 7 and can be twisted by the armature 5 about the axis 8 journalled in the housing at 9 and 10.
  • the rigidity of the entire pick-up system consists of the torsional rigidity of the crystal about the axis 3 and of the rigidities of the armature 5 and the needle holder,
  • the two resilient needle holders are intercoupled by means of a damping member ill arranged adjacent the needles 2 and 3.
  • the rigidity produced by the damping member 11 is parallel only to the larger rigidities of the resilient needle holders so that the smallest rigidity about the torsion axis 8 remains constant whereas any resonance of the free needle 3 is counteracted by the damping mate rial.
  • a phonograph pick-up comprising at least two selectively operative and spaced tracking needles, a resilient needle holder for each tracking needle, 2. common transducer, a V-shaped armature connecting both needle holders to said common transducer, and means for externally damping undesired resonance vibrations of said needle holders including an element constituted of damping mater.al directly intercoupling said resilient needle holders.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
US493220A 1954-03-10 1955-03-09 Dual needle phonograph pick-up Expired - Lifetime US2868893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL185764 1954-03-10

Publications (1)

Publication Number Publication Date
US2868893A true US2868893A (en) 1959-01-13

Family

ID=19750656

Family Applications (1)

Application Number Title Priority Date Filing Date
US493220A Expired - Lifetime US2868893A (en) 1954-03-10 1955-03-09 Dual needle phonograph pick-up

Country Status (7)

Country Link
US (1) US2868893A (xx)
BE (1) BE536330A (xx)
CH (1) CH327013A (xx)
DE (1) DE962653C (xx)
FR (1) FR1120394A (xx)
GB (1) GB765621A (xx)
NL (1) NL87749C (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1054727B (de) * 1955-05-04 1959-04-09 Funkwerk Leipzig Veb Piezoelektrisches Tonabnehmersystem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563860A (en) * 1946-10-11 1951-08-14 Gray Mfg Co Sound recording and reproducing head
US2570578A (en) * 1949-03-11 1951-10-09 Magnavox Co Dual stylus phonograph pickup
US2777016A (en) * 1952-12-19 1957-01-08 Electro Voice Dual needle phonograph cartridge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563860A (en) * 1946-10-11 1951-08-14 Gray Mfg Co Sound recording and reproducing head
US2570578A (en) * 1949-03-11 1951-10-09 Magnavox Co Dual stylus phonograph pickup
US2777016A (en) * 1952-12-19 1957-01-08 Electro Voice Dual needle phonograph cartridge

Also Published As

Publication number Publication date
NL87749C (xx)
DE962653C (de) 1957-04-25
BE536330A (xx)
GB765621A (en) 1957-01-09
CH327013A (de) 1958-01-15
FR1120394A (fr) 1956-07-04

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