US1732029A - Acoustic instrument - Google Patents

Acoustic instrument Download PDF

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Publication number
US1732029A
US1732029A US40743A US4074325A US1732029A US 1732029 A US1732029 A US 1732029A US 40743 A US40743 A US 40743A US 4074325 A US4074325 A US 4074325A US 1732029 A US1732029 A US 1732029A
Authority
US
United States
Prior art keywords
diaphragm
acoustic
damping
contact
shows
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
US40743A
Other languages
English (en)
Inventor
Round Henry Joseph
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 US1732029A publication Critical patent/US1732029A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/26—Damping by means acting directly on free portion of diaphragm or cone

Definitions

  • the material of which the diaphragm is formed may be metallic or non-metallic, according to the use to which it is to be put.
  • the diaphragm is so arranged that the period when the damping is attached is about 1500' per second, and in order to obtain this, the diaphragm should have a slightly higher period before the oiled rubber is applied.
  • Figure 3 shows a microphone similar to that shown in Figures 1 and 2, except that the diaphragm 1 is conical.
  • This diaphragm may conveniently be of metal or of stiff material, such as paper treated with a phenol condensation product, a suitable contact surface being arran ed for.
  • the diaphragm 1 is thin and light and carries a coil 13 mounted upon an annular former 14 attached to the diaphragm and projecting into the air gaps of a. magnetic circuit 15, which is magneti'zed-by a coil 16, or may be of the permanent magnet type.
  • the diaphragm is clamped firmly at .its periphery by means 7 of a ring 17 and is damped over substanrubber material 8, such as sponge, felt or the like.
  • Figure 7 shows a further modification of the apparatus shown in Figure 4, the diaphragm being of the ring type.
  • a thin dia hragm adapted for rapid vibration, a ho low container mounted adjacent said diaphragm, a ring of yielding material contacting said diaphragm and the edge of said container which faces said diaphragm and a material of variable resistance within said container.
  • damping means comprising a flexible, absorbent material containing a llquid, in con-' tact with a surface of said diaphragm, and a sound-responsive device in contact with the diaphragm surface opposite the damping means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US40743A 1924-07-16 1925-07-01 Acoustic instrument Expired - Lifetime US1732029A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17060/24A GB241277A (en) 1924-07-16 1924-07-16 Improvements relating to diaphragms for acoustic instruments

Publications (1)

Publication Number Publication Date
US1732029A true US1732029A (en) 1929-10-15

Family

ID=10088528

Family Applications (1)

Application Number Title Priority Date Filing Date
US40743A Expired - Lifetime US1732029A (en) 1924-07-16 1925-07-01 Acoustic instrument

Country Status (3)

Country Link
US (1) US1732029A (enrdf_load_stackoverflow)
GB (1) GB241277A (enrdf_load_stackoverflow)
NL (1) NL17351C (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427348A (en) * 1941-08-19 1947-09-16 Bell Telephone Labor Inc Piezoelectric vibrator
US2563452A (en) * 1951-08-07 Lotjd-speakek unit
US2627558A (en) * 1946-07-22 1953-02-03 Electro Voice Unidirectional microphone
US2730572A (en) * 1952-08-08 1956-01-10 Permo Inc Phonograph transducer
US2774438A (en) * 1951-04-25 1956-12-18 Shure Bros Mechanical damping means for the diaphragms of microphones, speakers, and the like
US2906828A (en) * 1956-09-17 1959-09-29 Gordon S Carbonneau Voice coil connection for loud-speakers
US3022487A (en) * 1951-08-11 1962-02-20 Harris Transducer Corp Electromagnetic transducer
US3177301A (en) * 1961-06-12 1965-04-06 Hecht William Sound translating device
US3247331A (en) * 1954-07-30 1966-04-19 Rca Corp Magnetic structure for a loudspeaker
US3351900A (en) * 1965-04-13 1967-11-07 Yamamoto Yujiro Acoustic transducer for use in dense medium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3509412A1 (de) * 1985-03-15 1986-09-25 Maschinenbau Oppenweiler Binder GmbH & Co, 7155 Oppenweiler Elektromechanischer anschlagfuehler
CN111266935B (zh) * 2020-03-13 2021-11-02 济南市平阴鑫森有限责任公司 一种圆盘类金属铸件的表面除锈处理器

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563452A (en) * 1951-08-07 Lotjd-speakek unit
US2427348A (en) * 1941-08-19 1947-09-16 Bell Telephone Labor Inc Piezoelectric vibrator
US2627558A (en) * 1946-07-22 1953-02-03 Electro Voice Unidirectional microphone
US2774438A (en) * 1951-04-25 1956-12-18 Shure Bros Mechanical damping means for the diaphragms of microphones, speakers, and the like
US3022487A (en) * 1951-08-11 1962-02-20 Harris Transducer Corp Electromagnetic transducer
US2730572A (en) * 1952-08-08 1956-01-10 Permo Inc Phonograph transducer
US3247331A (en) * 1954-07-30 1966-04-19 Rca Corp Magnetic structure for a loudspeaker
US2906828A (en) * 1956-09-17 1959-09-29 Gordon S Carbonneau Voice coil connection for loud-speakers
US3177301A (en) * 1961-06-12 1965-04-06 Hecht William Sound translating device
US3351900A (en) * 1965-04-13 1967-11-07 Yamamoto Yujiro Acoustic transducer for use in dense medium

Also Published As

Publication number Publication date
GB241277A (en) 1925-10-16
NL17351C (enrdf_load_stackoverflow)

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