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公开(公告)号：US3584161A
公开(公告)日：1971-06-08
申请号：US3584161D
申请日：1968-12-06
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAWLEY MELVILLE S
CPC classification number: H04R11/00
Abstract: The transducer includes a cup-shaped magnetic enclosure having a center pole piece threaded into the base thereof. A coil is disposed about the pole piece and an annular permanent magnet encircles the coil, the magnet being in engagement with the base but spaced from the wall of the enclosure. An annular pole piece is mounted on the magnet and a magnetic armature overlies both the center and magnet pole pieces, a nonmagnetic support locating the armature in close proximity with the pole pieces and spaced from the wall of the enclosure. An annular balancing pole piece secured to the wall of the enclosure extends into close proximity with the upper surface of the armature to complete the magnetic circuit.
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Patent Agency Ranking
公开(公告)号：US3116370A
公开(公告)日：1963-12-31
申请号：US81104759
申请日：1959-05-05
Applicant: BELL TELEPHONE LABOR INC
Inventor： ANDREGG ERNEST R , HAWLEY MELVILLE S , WILLIAM PFERD
IPC: H04M17/02
CPC classification number: H04M17/02
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公开(公告)号：US3223788A
公开(公告)日：1965-12-14
申请号：US20443362
申请日：1962-06-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAWLEY MELVILLE S , MCLELLAN DONALD W
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公开(公告)号：US3144524A
公开(公告)日：1964-08-11
申请号：US17571862
申请日：1962-02-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAWLEY MELVILLE S , HERSHEY HAROLD J
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公开(公告)号：US3303289A
公开(公告)日：1967-02-07
申请号：US56768866
申请日：1966-07-25
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAWLEY MELVILLE S , MCLELLAN DONALD W
IPC: H04Q5/02
CPC classification number: H04Q5/02
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公开(公告)号：US2202906A
公开(公告)日：1940-06-04
申请号：US18439038
申请日：1938-01-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAWLEY MELVILLE S
IPC: H04R11/00
CPC classification number: H04R11/00
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