US1961180A - Electroacoustic device - Google Patents

Electroacoustic device Download PDF

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Publication number
US1961180A
US1961180A US481448A US48144830A US1961180A US 1961180 A US1961180 A US 1961180A US 481448 A US481448 A US 481448A US 48144830 A US48144830 A US 48144830A US 1961180 A US1961180 A US 1961180A
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US
United States
Prior art keywords
armature
members
secured
electroacoustic device
yoke
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
US481448A
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English (en)
Inventor
Arend Thomas Van Urk
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1961180A publication Critical patent/US1961180A/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

Definitions

  • the invention concerns devices for converting electrical into acoustic oscillations or inversely such, for example, as loudspeakers, microphones or the like, comprising a ferromagnetic armature 5 which actuates, by means of one or more members, the vibrating member whereby the acoustic vibrations are produced.
  • At least one of the members serving for the connection of the armature and the vibrating member consists entirely or partly of a relatively to resonance phenomena so called dead material, for example of pressed material.
  • a dead material must hereinafter be understood to mean a material whose natural frequency is not located in the frequency range reproduced by the said devices. Such is, for example the case with pressed material prepared with the aid of artificial resins, pitch or the like. It has been stated that these pressed materials have a great internal damping owing to which they are eminently suited to serve as material for the members above referred to which, owing to their function, have the tendency of showing a strong resonance at a determined sound frequency. It has been found that such members, which hitherto have been made of metal, have such a pronounced natural resonance that they have a harmful effect on the quality of the sound reproduction.
  • the invention has for its object to obviate the said disadvantage. Besides, it afiords the advantage that the members can be pressed in one operation into the desired shape so that their manufacture is extremely suitable for mass-pro- 35 duction.
  • this yoke in which the armature actuates, by means of at least two members, a yoke on which the style for the vibrating member is mounted, this yoke consists, for example, of artificial resin.
  • Figure 1 is a lateral elevation of a loud speaker according to the invention.
  • Figure 2 is a longitudinal section taken on the 50 line II--II of Figure 1.
  • a soft iron armature 6 which is surrounded with some play by a coil '7 through which are led the speech currents to be converted into acoustic vibrations.
  • the two ends of the armature are secured to the middles of the two laminated springs 11 the free ends of which are clamped by screws 12.
  • the rectilinear reciprocating motion of the armature 6 is transferred by means of two rods 8 secured to the laminated springs 11, and of a yoke 9 secured to the said rods, to a rod 10 which acts on the vibrating member such as the cone 13.
  • the laminated springs 11, the rods 8, the yoke 9 and the rod 10, which consequently constitute the members with the aid of which the connection between the armature 6 and the vibrating member may be established, may be made, for example of an artificial resin such as Bakelite.
  • an artificial resin such as Bakelite.
  • an acoustic system comprising an armature and a vibratile diaphragm, a pair of oppositely disposed springs yieldably supporting said armature said springs being formed of an ar-.
  • an acoustic system comprising a diaphragm and an armature, means for connecting said diaphragm and armature comprising an elongated rod, a cross member secured to one end of said rod and a pair of oppositely disposed extensions secured to the ends of said armature and cross member respectively, said connecting means having a natural resonance period outside of the frequency range to be reproduced by said system and spring means of artificial resin for supporting said armature.
  • AREND THOMAS VAN URK AREND THOMAS VAN URK.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US481448A 1929-09-27 1930-09-12 Electroacoustic device Expired - Lifetime US1961180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL355919X 1929-09-27

Publications (1)

Publication Number Publication Date
US1961180A true US1961180A (en) 1934-06-05

Family

ID=19785222

Family Applications (1)

Application Number Title Priority Date Filing Date
US481448A Expired - Lifetime US1961180A (en) 1929-09-27 1930-09-12 Electroacoustic device

Country Status (4)

Country Link
US (1) US1961180A (enrdf_load_stackoverflow)
BE (1) BE372442A (enrdf_load_stackoverflow)
FR (1) FR700120A (enrdf_load_stackoverflow)
GB (1) GB355919A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB355919A (en) 1931-09-03
FR700120A (fr) 1931-02-24
BE372442A (enrdf_load_stackoverflow)

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