# US 4,399,478 A · Fixture device for magnetic head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,478 A - Document ID: US4399478A - Status: Granted - Kind: A - Application number: 06/187,523 - Filed: 1980-09-15 - Granted: 1983-08-16 - Earliest claimed: 1979-09-14 - Assignees: Olympus Optical Co., Ltd. - Inventors: Ryoichi Sawaki - Web page: https://patentgrep.com/patent/US4399478A ## CPC - G11B 5/54: with provision for moving the head into or out of its operative position or across tracks - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A fixture for a magnetic head for use in a tape recorder is disclosed. In the fixture, a base plate is provided with a magnetic head. A rotating support member rotatably supports the base plate on a base member in response to a pressing force in the thrust direction, and a guide pin on the base member guides the base plate along the rotating direction. ## Claims ### Claim 1 A fixture for a magnetic head, comprising a base member, a base plate, a magnetic head on said base plate, a rotating support member for rotatably supporting the base plate on the base member, and a guide pin on the base member for guiding the plate in the rotating direction, said base plate defining a plane, said magnetic head defining a gap transverse to said plane, said base plate being rotatably movable along the plane so that said gap advances and retracts with movement of the plate, said pin guiding the plate along the plane. ### Claim 2 A fixture for a magnetic head, comprising a base member, a base plate, a magnetic head on the base plate, rotating support means for rotatably supporting the base plate on the base member, and a guide pin on the base member for guiding the plate in the rotating direction, said rotating support means including a bearing member secured to said base plate for rotation with said base plate and defining bearing surfaces along an axis transverse to the base plate, said support means also including bearing means on the base member and coupled to the bearing surfaces for permitting rotation of said base plate. ### Claim 3 (depends on 2) A fixture as in claim 2, wherein said bearing member is in the shape of a ball and said bearing means include a recess for partially receiving said ball and means for urging said ball to said recess. ### Claim 4 (depends on 3) A fixture as in claim 3, wherein said recess is in the form of a hole. ### Claim 5 (depends on 3) A fixture as in claim 3, wherein said recess is conically shaped. ### Claim 6 (depends on 2) A fixture as in claim 2, wherein said bearing means includes a screw abutting against said ball. ### Claim 7 (depends on 3) A fixture as in claim 3, wherein said bearing means includes a screw abutting against said ball. ### Claim 8 (depends on 2) A fixture as in claim 2, wherein said bearing means includes a cap fitting abutting against said ball and a spring for urging said cap fitting against said ball. ### Claim 9 (depends on 3) A fixture as in claim 3, wherein said bearing means includes a cap fitting abutting against said ball and a spring for urging said cap fitting against said ball. ### Claim 10 (depends on 2) A fixture as in claim 2, wherein said bearing member includes recesses along an axis transverse to said plate, and wherein said bearing means includes means entering said recesses and allowing rotary movement of said bearing member. ### Claim 11 (depends on 10) A fixture as in claim 10, wherein said bearing means includes a pair of ball bearings between said recesses and said plate. ### Claim 12 (depends on 11) A fixture as in claim 11, wherein said bearing means further includes screw means for biasing said ball bearings into said recesses. ### Claim 13 (depends on 10) A fixture as in claim 10, wherein said bearing means includes a pair of conical screws entering said recesses. ### Claim 14 (depends on 10) A fixture as in claim 10, wherein said recesses are conical. ### Claim 15 (depends on 2) A fixture as in claim 2, wherein said bearing surfaces are conical and said bearing means include means for receiving the conical surfaces and allowing rotation of said base plate. ### Claim 16 (depends on 15) A fixture as in claim 15, wherein said bearing means include ball bearings. ### Claim 17 (depends on 16) A fixture as in claim 16, wherein said bearing means include a conical recess in said base plate and a biasing screw with a conical recess for receiving the conical bearing surfaces, said biasing screw being secured to said base plate. ### Claim 18 (depends on 15) A fixture as in claim 15, wherein said bearing means include a pair of screws with conical recesses for receiving the conical projections of said bearing member. ### Claim 19 (depends on 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18) A fixture as in any one of claims 2 to 18, wherein said base plate defines a plane, said magnetic head forms a gap transverse to the plane, said base plate is rotatably movable along the plane so that said gap advances and retracts with movement of the plate, and said pin extends along the plane substantially tangential to the rotating direction and said plate is slidably connected to said pin for guiding the plate along the plane.