MICROPHONE DIAPHRAGM ASSEMBLY

• US 3,555,206 A
• Filed: 09/15/1967
• Issued: 01/12/1971
• Est. Priority Date: 09/15/1967
• Status: Expired due to Term

• Current Assignee: Alexander L. Dvorsky
• Original Assignee: Alexander L. Dvorsky
• Inventors: Dvorsky, Alexander L.
• Application Number:
  US04/671,185
• Time in Patent Office: 1,215 Days
• US Class Current: 381/347
• CPC Class Codes: H04R 1/225 for telephonic receivers
• CPC Class Codes: H04R 7/20 Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
• CPC Class Codes: H04R 7/26 Damping by means acting directly on free portion of diaphragm or cone air damping H04R1/28

Abstract

A composite diaphragm structure combining a deeply drawn main diaphragm, an inturned compliance ring under the main diaphragm and an elastomer stiffener and damper applied to the front face of the main diaphragm.

Claims

1. A diaphragm assembly for a microphone comprising a diaphragm of formed sheet material having a center spherical dome and a semitoroidal corrugation surrounding said dome and a radially outward extending flat flange surrounding said corrugation, an edge-supporting semitoroidal corrugation of formed sheet material disposed under and inside of said corrugation and having a radially outward extending flat flange positioned in adhered face-to-face relation with said diaphragm flange and an inwardly directed mounting skirt on the second said corrugation, and a voice coil attached to said diaphragm near the juncture of said dome and said corrugation.

2. The diaphragm assembly of claim 1 in which the sheet material of said diaphragm is substantially thicker than the sheet material of the second said corrugation.

3. The diaphragm assembly of claim 1 in which the sheet material of said diaphragm is twice as thick as that of the second said corrugation, and both materials are of the same plastic material.

4. The diaphragm assembly of claim 3 in which the sheet materials of both said diaphragm and the second said corrugation are polyester plastic.

5. The diaphragm assembly of claim 1 in which a sheet of medium soft elastomer, having a center portion and radial arms, is disposed over the surface of said diaphragm, with said center portion adhered to said dome and the ends of said arms adhered to said corrugation.

6. a damper for application to the face of an acoustic diaphragm comprising a central circular body portion of elastomeric material and a plurality of arms extending radially outward of said body portion, an area of said body portion adhered to the midportion of said diaphragm and the extremities of said arms adhered to areas of said diaphragm radially spaced from said midportion.

7. A microphone assembly, comprising a magnetically permeable cup-shaped housing, a magnet within said housing and having an end disposed adjacent to the open end of said housing, a diaphragm overlying said housing open end and subject to the pressure of sound waves, a voice coil secured to and depending from said diaphragm and disposed adjacent to said magnet, whereby vibrations of the diaphragm cause movement of said voice coil in the magnetic field provided between said magnet and said housing, and a flexible member overlying said diaphragm and having at least limited contact therewith, said flexible member damping resonances in said diaphragm and having an opening for exposing at least a portion of said diaphragm directly to said sound waves.

8. The construction of claim 7 wherein said opening is at the center of said flexible member and the latter having radially outwardly extending legs, said flexible member being connected to said diaphragm at its marginal surface surrounding said center opening and at the ends of each of said legs.

9. a microphone assembly, comprising a magnetically permeable cup-shaped housing, a magnet within said housing and having an end disposed adjacent to the open end of said housing, a diaphragm overlying said housing open end and subject to the pressure of sound waves, said diaphragm having a central dome and a peripheral annular bulge surrounding said dome and providing an annular depression said diaphragm between said dome and said bulge, said dome and bulge both projecting in a direction away from said open end of said housing, a voice coil secured to and depending from said diaphragm and disposed adjacent to said magnet, whereby vibrations of the diaphragm cause movement of said voice coil in the magnetic field provided between said magnet and said housing, a flexible member formed of an elastomeric material overlying said annular depression and having a central opening exposing at least a portion of said dome.

10. The construction of claim 9 wherein said flexible material is secured To said dome and said bulge.

11. The construction of claim 10 wherein said flexible member is secured to said dome at its marginal portion surrounding its central opening, and has a plurality of arms each secured to said bulge.