US1646261A - Diaphragm - Google Patents

Diaphragm Download PDF

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Publication number
US1646261A
US1646261A US627063A US62706323A US1646261A US 1646261 A US1646261 A US 1646261A US 627063 A US627063 A US 627063A US 62706323 A US62706323 A US 62706323A US 1646261 A US1646261 A US 1646261A
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US
United States
Prior art keywords
diaphragm
discs
celluloid
disc
shellac
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
US627063A
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English (en)
Inventor
Schmidt Lambert
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.)
RADIOTIVE Corp
Original Assignee
RADIOTIVE 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 RADIOTIVE CORP filed Critical RADIOTIVE CORP
Application granted granted Critical
Publication of US1646261A publication Critical patent/US1646261A/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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact

Definitions

  • LAMBERT SCHMIDT OF BROOKLYN, NEW YORK, ASSIGNOR TO RADIOTIVE CORPO- RATION, A CORPORATION OF NEW YORK.
  • This invention relates to diaphragms and more particularly to sound producing and augmenting diaphragms, such for instance as are commonly used in connection with sound receiving and transmitting apparatus.
  • the diaphragm should be 5 composed of a plurality of sheets or discs of fibrous material such as silk, cotton or paper, completely impregnated with and united in the form of a unitary structure by a phenolic condensation product.
  • Diaphragms of this nature In the practical manufacture of diaphragms of this nature, it has been found that not infrequently, the diaphragm when removed from the mold is distorted, and in some cases this distortion is of such degree as to make it unfit for use. Consequently, it is practically impossible to obtain uniform loudness and clearness of spoken words. Diaphragms of this construction referred to are also relatively expensive owing to the nature of the materials employed.
  • igure 1 is a perspective view showing the several component parts of the diaphragm before assembling the same to form the completed article;
  • Figure 2 is a plan view of a diaphra embodying the present improvements, with a part thereof broken away;
  • Figure 3 is a diametrical sectional view on an enlarged scale, taken on the line 3-3 of Figure 2.
  • the several parts of the diaphragm are 110 preferably of uniform diameter, each of the discs 5, 6 and 7 being provided with a central aperture 8, to receive a centering pin on one section of a mold (not shown) so that the several parts will assume superposed positions on the mold section in proper concentric relation to each other.
  • the celluloid disc 6 is first arranged upon the center pin of the mold, and the silk disc 7 is positioned upon this celluloid disc.
  • a mixture .consisting of two parts of powdered shellac and one part of powdered mica is then spread over the silk discv 7 in a layer of uniform thickness as indicated at 9. I have also found that very good results can be obtained with the use of shellac alone.
  • the other celluloid disc 5 is arranged in place on top of the powdered material 9.
  • the other or top section of the mold is then placed upon the disc 5 and by means of a suitable pressure exerting means the two mold parts are forced towards each other and are also heated.
  • the celluloid discs retain their individual disc form and are not amalgamated or homogeneously combined with each other or with the interposed layer of'adhesive com-'- position.
  • the primary purpose of the silk disc is to-provide a binder acting to prevent the possible disintegration or breaking down of the layer of shellac composition.
  • celluloid is best adapted for use in such diaphra s and is more uniformly responsive throng out the diaphragm area to vibratory influences than other materials which have heretofore been employed.
  • the principal advantage resulting from my new construction is the practical elimination of deleterious effects of variation! in humidity and temperature of the atmosphere upon the structure of the diaphragm, causing warping or distortion thereof. This is due to the factthat As showna minimum of moisture absorption material is embodied in the dia hragm structure.
  • this outer annu ar section of the diaphragm will be comparatively flexible while the inner thickened portion thereof is more rigid.
  • the inner portion of the diaphragm will move as a unit with the rod and the flexure of said diaphragm will take place between the outer edge of this thickened area and the extreme edge of the diaphragm which is clamped between the body and rim of the casing within which the telephone magnet is housed. Therefore, it will be seen that the entire outer annular portion of the diaphragm will partake of the vibratory movements transmitted to said diaphragm through the connection with the magnet armature.
  • the adhesive material whether of shellac and mica, or of shellac only, possesses a sufficient degree of elasticity to permit of such vibration of the diaphragm without crackin or disintegrating the adhesive material. uch uniform distribution of the vibrations produces a highly accurate translation of the voice currents into sound Waves so that very clear, loud and distinct tones or other sounds will be produced.
  • the assembled parts of the diaphragm remain in the heated mold lot as above described while'the mold is permitted to.slowly cool, after which the two mold sections are separated and the completed dia hragm then removed.
  • the celluloid discs are not porous or absorbent. They are, nevertheless, securely held by the adhesiveness of the shellac composition so that together with the interposed disc of silk,-they constitute a unitary structure.
  • the rod which transmits vibrations to the sounding diaphragm may be centrally connected thereto through the opening 8 in any preferred manner, such connection constituting no essential part of my present improvements.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US627063A 1923-06-20 1923-03-23 Diaphragm Expired - Lifetime US1646261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16046/23A GB222180A (en) 1923-06-20 1923-06-20 Improvements relating to diaphragms

Publications (1)

Publication Number Publication Date
US1646261A true US1646261A (en) 1927-10-18

Family

ID=10070144

Family Applications (1)

Application Number Title Priority Date Filing Date
US627063A Expired - Lifetime US1646261A (en) 1923-06-20 1923-03-23 Diaphragm

Country Status (5)

Country Link
US (1) US1646261A (enrdf_load_stackoverflow)
DE (1) DE430435C (enrdf_load_stackoverflow)
FR (1) FR568290A (enrdf_load_stackoverflow)
GB (1) GB222180A (enrdf_load_stackoverflow)
NL (1) NL13657C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020971A (en) * 1962-02-13 Cefaly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT304162B (de) * 1969-12-18 1972-12-27 Ciba Geigy Ag Stabilisierung von pestiziden Phosphorsäureestern
GB2169471A (en) * 1985-01-04 1986-07-09 Anthony Bernard Clarke Acoustic diaphragm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020971A (en) * 1962-02-13 Cefaly

Also Published As

Publication number Publication date
NL13657C (enrdf_load_stackoverflow) 1925-09-15
FR568290A (fr) 1924-03-21
GB222180A (en) 1924-09-22
DE430435C (de) 1926-06-18

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