# US 2012/0070022 A1 · Speaker, hearing aid, earphone, and portable terminal device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0070022 A1 - Document ID: US20120070022A1 - Status: Published application - Kind: A1 - Application number: 13/320,825 - Filed: 2011-03-14 - Published: 2012-03-22 - Earliest claimed: 2010-03-18 - Assignees: Panasonic Corporation - Inventors: Shuji Saiki - Web page: https://patentgrep.com/patent/US20120070022A1 ## CPC - H04R 9/063: {using a plurality of acoustic drivers (H04R1/24 and H04R1/403 take precedence)} - H04R 1/10: Earpieces; Attachments therefor {; Earphones; Monophonic headphones (H04R1/28 takes precedence; stereophonic headphones H04R5/033)} - H04R 1/1016: {Earpieces of the intra-aural type} - H04R 7/20: Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands - H04R 25/00: Electric hearing aids - 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 A speaker capable of suppressing deterioration of acoustic efficiency while allowing miniaturization of the speaker includes a first unit (20) and a second unit (21) each of which outputs sound. The first unit (20) includes: a diaphragm (25) which vibrates back and forth to radiate sound; and plural suspensions (26a, 26b, 26c, 26d) which support, at different positions, an outer periphery of the diaphragm (25). At least one of air passages (35a, 35b) for channeling sound from the second unit (21) to the outside is provided between the plural suspensions (26a, 26b, 26c, 26d). ## Claims ### Claim 1 A speaker comprising a first unit and a second unit each of which is configured to output sound, wherein said first unit includes: a first diaphragm which vibrates back and forth to radiate sound; and a plurality of suspensions which support an outer periphery of said first diaphragm at mutually different positions, and wherein at least one air passage for channeling sound outputted from said second unit to the outside is provided between said suspensions. ### Claim 2 (depends on 1) The speaker according to claim 1, wherein said second unit includes a second diaphragm which vibrates back and forth to radiate the sound, and said first diaphragm and said second diaphragm are arranged in series such that at least part of a membrane surface of one of said diaphragms overlaps with at least part of a membrane surface of the other when seen from a vibration direction of said first diaphragm or said second diaphragm. ### Claim 3 (depends on 2) The speaker according to claim 2, further comprising an acoustic port through which sound is radiated to the outside, wherein said first unit is disposed between said acoustic port and said second unit, the sound radiated to a front of said first diaphragm is radiated to the outside through said acoustic port, and the sound radiated to a front of said second diaphragm passes through the at least one air passage, and is radiated to the outside through said acoustic port. ### Claim 4 (depends on 2) The speaker according to claim 2, wherein a first sound hole and a second sound hole are formed in said acoustic port, the sound radiated from said first diaphragm is radiated from the first sound hole, and the sound radiated from said second diaphragm is radiated from the second sound hole, via the at least one air passage. ### Claim 5 (depends on 4) The speaker according to claim 4, wherein a first air chamber is formed in front of said first diaphragm, a second air chamber is formed in front of said second diaphragm, and the first air chamber, the second air chamber, the first sound hole, and the second sound hole are formed such that a first acoustic resonance and a second acoustic resonance have mutually different frequencies, the first acoustic resonance being dependent on an acoustic capacitance of the first air chamber and an acoustic mass of the first air hole, and the second acoustic resonance being dependent on an acoustic capacitance of the second air chamber and an acoustic mass of the second air hole. ### Claim 6 (depends on 2) The speaker according to claim 2, wherein the respective vibration directions of said first diaphragm and said second diaphragm are opposite directions. ### Claim 7 (depends on 6) The speaker according to claim 6, wherein each of said first unit and said second unit is an electrodynamic electro-acoustic transducer including a magnetic circuit, and a magnetizing direction of said magnetic circuit of said first unit and a magnetizing direction of said magnetic circuit of said second unit are mutually opposite in the vibration direction of said diaphragms. ### Claim 8 (depends on 7) The speaker according to claim 7, wherein said first unit and said second unit are arranged such that a bottom face-side of said magnetic circuit of said first unit and a bottom face-side of said magnetic circuit of said second unit face each other. ### Claim 9 (depends on 7) The speaker according to claim 7, wherein said first unit and said second unit are arranged such that said first diaphragm and said second diaphragm face each other. ### Claim 10 (depends on 1) The speaker according to claim 1, wherein a first air chamber is formed in front of said first diaphragm, a second air chamber is formed in front of said second diaphragm, a sound hole is formed in said acoustic port, the sound hole is connected to the first air chamber, and is connected to the second air chamber via the at least one air passage, and the sound radiated to the back of said first diaphragm and the sound radiated to the back of said second diaphragm are radiated in a direction different from a direction of sound radiated from the sound hole. ### Claim 11 (depends on 7) The speaker according to claim 7, wherein a magnetic fluid is filled into a magnetic air gap formed in said magnetic circuit of said first unit and into which a voice coil is inserted. ### Claim 12 (depends on 1) A hearing aid or an earphone comprising said speaker according to claim 1. ### Claim 13 (depends on 12) The hearing aid or the earphone according to claim 12, further comprising an ear tip at an exit-side of said acoustic port. ### Claim 14 (depends on 13) The hearing aid or the earphone according to claim 13, wherein an air passage hole is formed in said ear tip, for allowing air inside an external auditory canal to pass to the outside. ### Claim 15 (depends on 1) A portable terminal device comprising the speaker according to claim 1.