# US 5,703,839 A · Magnetic head for magnetooptical recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,839 A - Document ID: US5703839A - Status: Granted - Kind: A - Application number: 08/489,458 - Filed: 1995-06-12 - Granted: 1997-12-30 - Earliest claimed: 1994-06-14 - Assignees: Canon Kabushiki Kaisha - Inventors: Kazuyoshi Ishii - Web page: https://patentgrep.com/patent/US5703839A ## CPC - G11B 11/1058: {Flying heads} - G11B 11/10534: {for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording} - G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier} - 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 magnetic head for magnetooptical recording is provided with a slider base, a core made of a magnetic material, and a coil composed of a spiral thin film conductor. The core is mounted on the slider base and has a main pole. A thin plate-shaped cover member is provided to surround the main pole while exposing the upper end face thereof. The cover member is composed of an antiabrasive material. An air bearing face or a sliding face is formed on the surface of the cover member. The coil is formed on the rear surface of the cover member. ## Claims ### Claim 1 A magnetic head for magnetooptical recording comprising: a slider base; a core comprising a magnetic material, mounted on said slider base, said core having a main pole; a thin plate-shaped cover member which surrounds the periphery of said main pole, an upper end face of which is exposed, said cover member being composed of an antiabrasive material and a front surface of said cover member being arranged to face a magnetooptical recording medium; and a coil composed of a thin film conductor formed on a rear surface of said cover member, said coil being formed spirally by patterning. ### Claim 2 (depends on 1) A magnetic head according to claim 1, wherein said slider base is composed of a material selected from metal and a resinous material. ### Claim 3 (depends on 1) A magnetic head according to claim 1, wherein said slider base and said core are integrally composed of a magnetic material. ### Claim 4 (depends on 1) A magnetic head according to claim 1, further comprising: a spacer provided between said core and said cover member. ### Claim 5 (depends on 4) A magnetic head according to claim 4, wherein said spacer is composed of a material selected from metal and a resinous material. ### Claim 6 (depends on 1) A magnetic head according to claim 1, wherein said cover member is composed of one of a non-magnetic ceramic material, a non-magnetic ferrite and a glassy carbon. ### Claim 7 (depends on 1) A magnetic head according to claim 1, wherein said cover member is composed of at least two members, wherein the member at the surface side and the member at the rear surface side are composed of mutually different materials. ### Claim 8 A magnetooptical recording apparatus comprising: an optical head for irradiating a magnetooptical recording medium with a light beam; and a magnetic head for applying a magnetic field modulated by an information signal to the recording medium, said magnetic head comprising: (1) a slider base; (2) a core comprising a magnetic material mounted on said slider base, said core having a main pole; (3) a thin plate-shaped cover member which surrounds the periphery of said main pole, an upper end surface of which is exposed, said cover member being composed of an antiabrasive material add a front surface of said cover member being arranged to face a magnetooptical recording medium; and (4) a coil composed of a thin film conductor formed on a rear surface of said cover member, said coil being formed spirally by patterning. ### Claim 9 A magnetic head for magnetooptical recording comprising: a slider base; a core comprising a magnetic material mounted on said slider base, said core having a main pole; a thin plate-shaped cover member which covers an upper end face of said main pole, said cover member being composed of an antiabrasive material and a front surface of said cover member being arranged to face a magnetooptical recording medium; and a coil composed of a thin film conductor formed on a rear surface of said cover member, said coil being formed spirally by patterning. ### Claim 10 (depends on 9) A magnetic head according to claim 9, wherein said slider base is composed of a material selected from metal and a resinous material. ### Claim 11 (depends on 9) A magnetic head according to claim 9, wherein said cover member is composed of one of a non-magnetic ceramic material, a non-magnetic ferrite and a glassy carbon. ### Claim 12 A magnetooptical recording apparatus comprising: an optical head for irradiating a magnetooptical recording medium with a light beam; and a magnetic head for applying a magnetic field modulated by an information signal to the recording medium, said magnetic head comprising: (1) a slider base; (2) a core comprising a magnetic material mounted on said slider base, said core having a main pole; (3) a thin plate-shaped cover member which covers an upper end face of said main pole, said cover member being composed of an antiabrasive material and a front surface of said cover member being arranged to face a magnetooptical recording medium; and (4) a coil composed of a thin film conductor formed on a rear surface of said cover member, said coil being formed spirally by patterning. ### Claim 13 (depends on 1) A magnetic head according to claim 1, wherein the surface facing the magnetooptical recording medium is one of an air bearing surface and a sliding surface. ### Claim 14 (depends on 8) A magnetooptical recording apparatus according to claim 8, wherein the surface facing the magnetooptical recording medium is one of an air bearing surface and a sliding surface. ### Claim 15 (depends on 9) A magnetic head according to claim 9, wherein the surface facing the magnetooptical recording medium is one of an air bearing surface and a sliding surface. ### Claim 16 (depends on 12) A magnetooptical recording apparatus according to claim 12, wherein the surface facing the magnetooptical recording medium is one of an air bearing surface and a sliding surface.