US1980137A - Electrical reproducer for disk records - Google Patents

Electrical reproducer for disk records Download PDF

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Publication number
US1980137A
US1980137A US639507A US63950732A US1980137A US 1980137 A US1980137 A US 1980137A US 639507 A US639507 A US 639507A US 63950732 A US63950732 A US 63950732A US 1980137 A US1980137 A US 1980137A
Authority
US
United States
Prior art keywords
knife edge
bearing
bearings
disk records
knife
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
US639507A
Other languages
English (en)
Inventor
Hubner Hanns
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.)
CARL LINDSTROM AG
Original Assignee
CARL LINDSTROM AG
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 CARL LINDSTROM AG filed Critical CARL LINDSTROM AG
Application granted granted Critical
Publication of US1980137A publication Critical patent/US1980137A/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
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • the armature is generally mounted in roller bearings which are provided with rubber damping or the known knife edge bearings are used.
  • the knife edge bearing has in itself the advantage of possessing a stationary axis of rotation about which the oscillations take place .so that deviations of the form of the curve of the current produced in the pick-up from the ideal sine form, that is non-linear distortions, are to a large extent avoided.
  • This invention has the object of avoiding these disadvantages of the hitherto known electrical reproducers or pick-ups for disk records. According to the invention this object is achieved in the electrical reproducer for disk records with armature mounted on knife edges by the whole knife edge bearing being mounted in an elastic material (rubber or the like) which is yielding in a direction perpendicular to the axis.
  • the device is preferably constructed in such a manner that for holding the knife edges in the knife edge bearing a leaf spring is provided which bears on at least one of the parts connected by it (knife edge or hearing) through the intermediary of a damping elastic material (for example rubber).
  • the bearing may advantageously be arranged in the opening of the pole shoes of a four-pole magnet system.
  • Fig. 1 is a cross-section on the line 11-17 of Fig. 2, and
  • Fig. 2 is a longitudinal section.
  • the armature 1 is provided in a manne known per se with the knife edges 2 which bear against the knife edge bearings 3. Over the knife edge bearings 3 and the knife edge members 2, elastic tubular members 4 of rubber, constructed in the form of a hose, are placed which form the elastic bearing. The armature 1 engages with centrally disposed pins 8 over the middle part of a leaf spring 5 which ensures that the knife 7 edges 2 will bear firmly against the knife edge bearing 3. The leaf spring 5 lies on the rubber dampers 4 which enclose the whole knife edge bearing.
  • the whole knife edge bearing with the elastic envelope is preferably mounted in bearing members 6 which are secured in the two pole shoes 7.
  • an armature having oppositely extending members provided on their upper sides with knife edges, bearings having knife edge recesses in their lower sides and bearing on said knife edges, and tubular elastic damper members extending around and enclosing said knife edge members and said bearings and active to frictionally resist relative angular movement between said knife edge members and said bearings and thereby efiect damping of the points of resonance.
  • Apparatus as claimed in claim 1 including a spring connected to the armature and bearing downwardly on the tubular elastic damper members.
  • an armature having oppositely extending members provided on their upper sides with knife edges, bearings having knife edge recesses in their lower sides and bearing on said knife edges, tubular elastic damper members extending around and enclosing said knife edge members and said bearings, a spring connected to the armature and bearing downwardly on the tubular elastic damper members and a pole element having bearing members in which the said tubular elastic damper members and hence also the armature and its bearings are mounted I-IANNS HUBNER.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Motor Or Generator Frames (AREA)
  • Vibration Prevention Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US639507A 1931-11-23 1932-10-25 Electrical reproducer for disk records Expired - Lifetime US1980137A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE387974X 1931-11-23

Publications (1)

Publication Number Publication Date
US1980137A true US1980137A (en) 1934-11-06

Family

ID=6371215

Family Applications (1)

Application Number Title Priority Date Filing Date
US639507A Expired - Lifetime US1980137A (en) 1931-11-23 1932-10-25 Electrical reproducer for disk records

Country Status (3)

Country Link
US (1) US1980137A (fr)
FR (1) FR744199A (fr)
GB (1) GB387974A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496484A (en) * 1946-04-17 1950-02-07 Massa Frank Magnetostrictive phonograph pickup
US2585040A (en) * 1949-03-23 1952-02-12 Frederick Hart & Co Inc Electromagnetic recording head
US2769038A (en) * 1952-11-29 1956-10-30 Orton Melvern Phonograph pickup and the like

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496484A (en) * 1946-04-17 1950-02-07 Massa Frank Magnetostrictive phonograph pickup
US2585040A (en) * 1949-03-23 1952-02-12 Frederick Hart & Co Inc Electromagnetic recording head
US2769038A (en) * 1952-11-29 1956-10-30 Orton Melvern Phonograph pickup and the like

Also Published As

Publication number Publication date
GB387974A (en) 1933-02-16
FR744199A (fr) 1933-04-13

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