Patents Assigned to Foster Electric Company, Limited
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Patent number: 11317213Abstract: In a diaphragm 1, at a front surface side surface layer of a base material 10 made of pulps 20 which are mainly composed of cellulose, a mixed layer 11 in which the pulps 20, mica 22, and cellulose nanofibers 21 are mixed is formed.Type: GrantFiled: October 3, 2019Date of Patent: April 26, 2022Assignee: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Hisami Kajiwara
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Patent number: 11284198Abstract: A speaker unit, which can be made thin, includes: a magnetic circuit 61 having a space serving as a magnetic gap G formed inside a cylindrical portion 69; a voice coil 85 arranged in the magnetic gap G; and a diaphragm 51 having a center hole 51a that penetrates a center of the diaphragm, an outer peripheral portion 51b supported on a frame 53, and an inner peripheral portion 51c whose inner peripheral surface is connected to the voice coil 85. The cylindrical portion 69 of the magnetic circuit 61 includes a standing wall 69c formed along a vibration direction A of the diaphragm 51, and a slit 69a. The inner peripheral portion 51c of the diaphragm 51 includes an insert hole (a standing wall receiving portion) 57 in which the standing wall 69c is inserted, and an insert portion 59 which is inserted in the slit 69a.Type: GrantFiled: August 22, 2018Date of Patent: March 22, 2022Assignee: Foster Electric Company, LimitedInventor: Takayuki Tabata
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Publication number: 20220038809Abstract: The present invention is configured such that, a ring member is bonded to a cone section formed on the outer circumference of a vibration plate body, and the inner circumferential section of an edge is bonded to the outer circumference section of the ring member or the cone section. Thus, the stiffness is increased without requiring a change in the shape of the vibration plate body, that is, the stiffness is improved without causing an increase in the weight of the vibration plate body, and a degradation in acoustic pressure at high frequencies is prevented.Type: ApplicationFiled: September 12, 2019Publication date: February 3, 2022Applicant: Foster Electric Company, LimitedInventors: Shintaro Yamaki, Takashi Matsumura, Minoru Horiguchi
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Publication number: 20210385580Abstract: In a diaphragm 1, at a front surface side surface layer of a base material 10 made of pulps 20 which are mainly composed of cellulose, a mixed layer 11 in which the pulps 20, mica 22, and cellulose nanofibers 21 are mixed is formed.Type: ApplicationFiled: October 3, 2019Publication date: December 9, 2021Applicant: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Hisami KAJIWARA
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Publication number: 20210351680Abstract: An oscillatory actuator 1 includes a cylindrical case 2, an electromagnetic driver 3, a mover 4, a first damper 40a, and an inner guide 6a. The electromagnetic driver 3 is provided inside the case 2. The mover 4 is enabled to oscillate through driving by the electromagnetic driver 3. The first damper 40a has a plurality of arms 52a supporting the mover 4 from an inner surface of the case 2. The inner guide 6a is provided on the inner surface of the case 2 and restricts movement of the first damper 40a beyond a predetermined range. The inner guide 6a is located further toward a center of the case 2 than the first damper 40a in a direction of an oscillation axis ? of the mover 4.Type: ApplicationFiled: September 17, 2019Publication date: November 11, 2021Applicant: FOSTER ELECTRIC COMPANY, LIMITEDInventors: Yusuke Chiba, Yoshikazu Okazaki
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Publication number: 20210159768Abstract: An oscillatory actuator includes a first damper 51 and a second damper 251 attached to a case 1 and including spiral arms, and first elastic member 150 and second elastic member 350 bridging adjacent arms of the first damper 51 and the second damper 251.Type: ApplicationFiled: April 3, 2019Publication date: May 27, 2021Applicant: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Yusuke CHIBA
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Publication number: 20200336838Abstract: A speaker unit, which can be made thin, includes: a magnetic circuit 61 having a space serving as a magnetic gap G formed inside a cylindrical portion 69; a voice coil 85 arranged in the magnetic gap G; and a diaphragm 51 having a center hole 51a that penetrates a center of the diaphragm, an outer peripheral portion 51b supported on a frame 53, and an inner peripheral portion 51c whose inner peripheral surface is connected to the voice coil 85. The cylindrical portion 69 of the magnetic circuit 61 includes a standing wall 69c formed along a vibration direction A of the diaphragm 51, and a slit 69a. The inner peripheral portion 51c of the diaphragm 51 includes an insert hole (a standing wall receiving portion) 57 in which the standing wall 69c is inserted, and an insert portion 59 which is inserted in the slit 69a.Type: ApplicationFiled: August 22, 2018Publication date: October 22, 2020Applicant: Foster Electric Company, LimitedInventor: Takayuki Tabata
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Patent number: 10791399Abstract: Cylindrical ventilation ports radiating sound radiated from a rear surface of a diaphragm to an outside are projected from a rear surface of the electroacoustic converter having the diaphragm inside. A distal end of each ventilation port is located in a through hole of a circuit board, on which the electroacoustic converter is mounted, at a position farther away from the diaphragm than a contact surface of the circuit board. The distal end of each ventilation port may be in the through hole or may be protruded to the outside from the rear surface of the circuit board. As a result, since separation from the radiated sound from the front surface of the diaphragm is achieved, the radiated sound from the rear surface of the diaphragm is prevented from interfering with the radiated sound from the front surface of the diaphragm.Type: GrantFiled: August 31, 2015Date of Patent: September 29, 2020Assignee: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Akinori Matsunaga
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Publication number: 20190172440Abstract: The noise-canceling headphone includes a housing including a microphone collecting external noise and a speaker emitting a sound toward an opening of an external auditory canal of a user. The noise-canceling headphone generates a noise-canceling signal from a noise signal collected by the microphone, drives the speaker with the noise-canceling signal, and emits a noise-canceling sound having a phase opposite to that of the external noise. One microphone is provided outside a back cavity that is an acoustic space behind a diaphragm of the speaker in a housing, and a guide guiding the external noise to the microphone is provided in the housing.Type: ApplicationFiled: June 1, 2016Publication date: June 6, 2019Applicant: Foster Electric Company, LimitedInventor: Shinya Ashizawa
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Patent number: 10211009Abstract: A switch-containing cable when bended does not conduct electricity, but conducts electricity when pressurized with fingers. The cable has belt-like first and second oppositely disposed conductor films including respective first and second belt-like base materials on inner surfaces of which respective first and conductors are disposed; an insulating spacer arranged to maintain a gap therebetween; and a belt-like sheath configured with the first and second conductor films sandwiching the spacer and containing a belt-like conductor film functioning as a switch member in a hollow cavity. The first conductor film constituting the belt-like conductor film is movably overlaid on the insulating spacer, and the hollow cavity of the sheath includes a gap allowing for lengthwise relative displacement of at least the first belt-like base material caused by bending the sheath with respect to the belt-like conductor film housed in the hollow cavity, thereby preventing the cable from conducting electricity when bended.Type: GrantFiled: October 13, 2016Date of Patent: February 19, 2019Assignee: FOSTER ELECTRIC COMPANY LIMITEDInventors: Koichi Yajima, Morikazu Nakada
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Publication number: 20180220234Abstract: Cylindrical ventilation ports radiating sound radiated from a rear surface of a diaphragm to an outside are projected from a rear surface of the electroacoustic converter having the diaphragm inside. A distal end of each ventilation port is located in a through hole of a circuit board, on which the electroacoustic converter is mounted, at a position farther away from the diaphragm than a contact surface of the circuit board. The distal end of each ventilation port may be in the through hole or may be protruded to the outside from the rear surface of the circuit board. As a result, since separation from the radiated sound from the front surface of the diaphragm is achieved, the radiated sound from the rear surface of the diaphragm is prevented from interfering with the radiated sound from the front surface of the diaphragm.Type: ApplicationFiled: August 31, 2015Publication date: August 2, 2018Applicant: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Akinori Matsunaga
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Patent number: D718285Type: GrantFiled: October 28, 2013Date of Patent: November 25, 2014Assignee: Foster Electric Company LimitedInventor: Hidenori Shibusawa
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Patent number: D726165Type: GrantFiled: April 24, 2014Date of Patent: April 7, 2015Assignee: Foster Electric Company, LimitedInventors: Etsuo Kawaji, Zhongkai Yang
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Patent number: D761233Type: GrantFiled: June 16, 2015Date of Patent: July 12, 2016Assignee: Foster Electric Company, LimitedInventors: Etsuo Kawaji, Koichi Yajima
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Patent number: D771016Type: GrantFiled: June 16, 2015Date of Patent: November 8, 2016Assignee: FOSTER ELECTRIC COMPANY LIMITEDInventor: Akinori Matsunaga
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Patent number: D771021Type: GrantFiled: June 16, 2015Date of Patent: November 8, 2016Assignee: FOSTER ELECTRIC COMPANY LIMITEDInventor: Akinori Matsunaga
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Patent number: D821361Type: GrantFiled: August 5, 2016Date of Patent: June 26, 2018Assignee: FOSTER ELECTRIC COMPANY LIMITEDInventors: Myogen Shoda, Gaku Kubota
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Patent number: D897984Type: GrantFiled: December 21, 2018Date of Patent: October 6, 2020Assignee: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Moritake Abe
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Patent number: D909344Type: GrantFiled: March 5, 2019Date of Patent: February 2, 2021Assignee: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Moritake Abe
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Patent number: D929351Type: GrantFiled: September 11, 2019Date of Patent: August 31, 2021Assignee: FOSTER ELECTRIC COMPANY, LIMITEDInventor: Ryo Takahashi