公开(公告)号：US3619517A

公开(公告)日：1971-11-09

申请号：US3619517D

申请日：1968-12-23

Applicant: RCA CORP

Inventor： BLEAZEY JOHN C

IPC: H04R1/22 ,  H04R9/08

CPC classification number: H04R1/222

Abstract: A labyrinth structure for a unidirectional ribbon-type microphone comprises an outer shell-like member and at least one inner member, each having open and closed ends, the space enclosed by the outer member being divided into at least two communicating chambers by the inner member. The inner chamber, in addition to being the end of the labyrinth path, can be used to house microphone components therein and also to shield these components by making at least one member of a good electrical conductor.

公开(公告)号：US2814677A

公开(公告)日：1957-11-26

申请号：US46526954

申请日：1954-10-28

Applicant: RCA CORP

Inventor： BLEAZEY JOHN C

IPC: H04R1/20 ,  H04R1/22 ,  H04R1/32 ,  H04R1/40

CPC classification number: H04R1/406 ,  H04R1/20 ,  H04R1/222 ,  H04R1/32 ,  H04R1/326

公开(公告)号：US3073411A

公开(公告)日：1963-01-15

申请号：US84962759

申请日：1959-10-29

Applicant: RCA CORP

Inventor： BLEAZEY JOHN C ,  JOHN PRESTON

IPC: H04R7/14

CPC classification number: H04R7/14

公开(公告)号：US2913644A

公开(公告)日：1959-11-17

申请号：US59659856

申请日：1956-07-09

Applicant: RCA CORP

Inventor： BLEAZEY JOHN C

公开(公告)号：US2680787A

公开(公告)日：1954-06-08

申请号：US25913851

申请日：1951-11-30

Applicant: RCA CORP

Inventor： OLSON HARRY F ,  JOHN PRESTON ,  BLEAZEY JOHN C

IPC: H04R1/38

CPC classification number: H04R1/38