# US 8,275,156 B2 · Ribbon microphone and ribbon microphone unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,275,156 B2 - Document ID: US8275156B2 - Status: Granted - Kind: B2 - Application number: 12/265,477 - Filed: 2008-11-05 - Published: 2009-05-07 - Granted: 2012-09-25 - Earliest claimed: 2007-11-06 - Assignees: Kabushiki Kaisha Audio-Technica - Inventors: Hiroshi Akino - Web page: https://patentgrep.com/patent/US8275156B2 ## CPC - H04R 9/048: {of the ribbon type} - H04R 31/006: {Interconnection of transducer parts (of diaphragm and outer suspension by moulding H04R31/003)} - H04R 9/08: Microphones - H04R 2307/027: Diaphragms comprising metallic materials - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract To obtain a ribbon microphone unit, which makes the tension of a diaphragm adjustable by configuring a ribbon diaphragm assembly that is detachable to a magnetic-circuit assembly including a magnet, and which further allows a user side to carry out the maintenance by replacing the ribbon diaphragm assembly; a ribbon microphone unit comprises: a magnetic-circuit assembly including a magnet; and a ribbon diaphragm, wherein the ribbon diaphragm, together with a substrate having a circuit pattern formed on both ends thereof, a metal fitting for crimping an end portion of the ribbon diaphragm to the circuit pattern, and a screw for crimping the metal fitting toward the substrate, constitute a diaphragm assembly, and wherein the diaphragm assembly is secured to the magnetic-circuit assembly. ## Claims ### Claim 1 A ribbon microphone unit comprising: a magnetic-circuit assembly; and two ribbon diaphragm assemblies, wherein the magnetic-circuit assembly comprises: a yoke having a rectangular window hole that is formed in a center, opposing magnets secured to wall surfaces in the longitudinal direction of the rectangular window hole, and a magnetic gap formed between the magnets; wherein each of the two ribbon diaphragm assemblies comprises: a ribbon diaphragm disposed inside the magnetic gap and vibrates in response to a sound wave; and a substrate having a window hole and a circuit pattern formed on both ends of the window hole; wherein the two ribbon diaphragm assemblies are respectively attachable to and detachable from both side of the magnetic-circuit assembly. ### Claim 2 (depends on 1) The ribbon microphone unit according to claim 1, wherein a spacer is interposed between the circuit pattern and the ribbon diaphragm. ### Claim 3 (depends on 2) The ribbon microphone unit according to claim 2, wherein the ribbon diaphragm is lifted from a surface of the substrate by the spacer being interposed between the circuit pattern and the ribbon diaphragm. ### Claim 4 (depends on 1) The ribbon microphone unit according to claim 1, wherein: the substrate is rectangular, and has a window hole with a length approximately equal to or greater than half a length of the substrate, the length of the window hole extends in a longitudinal direction, and the window hole is formed in a center of the substrate. ### Claim 5 (depends on 1) The ribbon microphone unit according to claim 1, wherein the metal fitting is made of an electrically conductive material. ### Claim 6 (depends on 1) The ribbon microphone unit according to claim 1, wherein the yoke is rectangular, and has a long window hole, which is long in a longitudinal direction, formed in a center of the yoke. ### Claim 7 (depends on 1) The ribbon microphone unit according to claim 1, wherein the magnet is fixedly adhered to an inner wall parallel to a longitudinal direction of the window hole of the yoke. ### Claim 8 (depends on 1) The ribbon microphone unit according to claim 1, wherein a dustproof cloth is stuck on a position to plug the window hole of the substrate. ### Claim 9 (depends on 1) The ribbon microphone unit according to claim 1, wherein a magnet is fixedly adhered to a position to plug the window hole of the substrate. ### Claim 10 (depends on 1, 2, 3, 4, 5, 6, 7, 8) A ribbon microphone, wherein the ribbon microphone unit according to any of claims 1 to 3, 4 to 7, 8, and 9 is incorporated into a microphone case. ### Claim 11 (depends on 1) The ribbon microphone unit according to claim 1, wherein the substrate is an integral element with the window hole being a single hole positioned in a center of the substrate. ### Claim 12 (depends on 1) The ribbon microphone unit according to claim 1, wherein the substrate is a rectangular element formed with the window hole being positioned in a longitudinal direction such that the ribbon diaphragm is disposed vertically across the window hole. ### Claim 13 A ribbon microphone unit comprising: a magnetic-circuit assembly including a magnet and having a magnetic gap; and a ribbon diaphragm disposed inside the magnetic gap and vibrates in response to a sound wave, wherein the magnetic-circuit assembly comprises a yoke having a window hole and a magnet secured to a wall surface of the window hole, wherein the ribbon diaphragm, together with a substrate having a window hole and a circuit pattern formed on both ends of the window hole, a metal fitting for crimping an end portion of the ribbon diaphragm to the circuit pattern, and a screw for crimping the metal fitting toward the substrate, constitute the ribbon diaphragm assembly, wherein the ribbon diaphragm assembly is secured to the magnetic-circuit assembly, and wherein the substrate is a rectangular element formed with the window hole being positioned in a longitudinal direction such that the ribbon diaphragm is disposed vertically across the window hole. ### Claim 14 A ribbon microphone unit comprising: a magnetic-circuit assembly including a magnet and having a magnetic gap; and a ribbon diaphragm disposed inside the magnetic gap and which vibrates in response to a sound wave, wherein the magnetic-circuit assembly comprises a yoke having a window hole and a magnet secured to a wall surface of the window hole, wherein the ribbon diaphragm, together with a substrate having a plurality of holes being positioned in a longitudinal direction and a circuit pattern formed on both ends of the plurality holes, a metal fitting for crimping an end portion of the ribbon diaphragm to the circuit pattern, and a screw for crimping the metal fitting toward the substrate, constitute the ribbon diaphragm assembly, wherein the ribbon diaphragm assembly is secured to the magnetic-circuit assembly, and wherein a width of the ribbon diaphragm is smaller than a width of each of the plurality of holes.