Bolometer and contact sensor arrangement for a heat-assisted magnetic recording device

    公开(公告)号:US10229706B1

    公开(公告)日:2019-03-12

    申请号:US15960100

    申请日:2018-04-23

    Abstract: A slider of a heat-assisted magnetic recording head comprises an air bearing surface and an optical waveguide configured to receive light from a laser source. The slider comprises a plurality of electrical bond pads including a first bond pad and a second bond pad. A first resistive sensor is configured to sense for spacing changes and contact between the slider and a magnetic recording medium at or near a first close point of the slider. A second resistive sensor is configured to sense for spacing changes and contact between the slider and the medium at or near a second close point of the slider. A bolometer is situated at a location within the slider that receives at least some of the light communicated along the optical waveguide. The first resistive sensor, the second resistive sensor, and the bolometer are coupled together and between the first and second bond pads.

    Recording head gimbal assembly programming by selective application of interconnects

    公开(公告)号:US10600435B2

    公开(公告)日:2020-03-24

    申请号:US15813391

    申请日:2017-11-15

    Abstract: A method for programming a head gimbal assembly. The method includes building a plurality of transducers into a slider, and testing the plurality of transducers to select one of the plurality of transducers for field operation. The method also includes providing an interconnect assembly having a plurality of traces with at least one of the plurality of traces having a plurality of electrically coupled bond pads. One of the plurality of bond pads is bonded electrically to the selected transducer out of the plurality of transducers, and the other bond pads of the plurality of bond pads are not electrically coupled to any of the plurality of transducers.

    Bolometer with temperature compensation for internal laser power monitoring in heat-assisted magnetic recording device

    公开(公告)号:US10410669B1

    公开(公告)日:2019-09-10

    申请号:US16170462

    申请日:2018-10-25

    Abstract: A slider configured for heat-assisted magnetic recording comprises an optical sensor coupled to first and second bond pads. The optical sensor comprises a bolometer and a reference sensor. The bolometer is situated at a location of the slider that receives at least some of the light and exposed to an ambient temperature at the slider. The bolometer produces a signal in response to a change in the ambient temperature and the change in output optical power. The reference sensor is situated at a location of the slider unexposed to the light and exposed to the ambient temperature. The reference sensor is coupled to the bolometer and configured to produce a signal in response to the change in the ambient temperature. The optical sensor is configured to generate a sensor signal indicative of changes in output optical power of a laser source without contribution due to ambient temperature changes.

    Bond pad sharing in head slider using null point center tap

    公开(公告)号:US10186291B1

    公开(公告)日:2019-01-22

    申请号:US15603730

    申请日:2017-05-24

    Abstract: A head slider for use in a disk drive is movably positionable relative to a magnetic recording disk and includes at least one write element for writing data to the magnetic recording disk. The write element includes a writer coil electrically connected between a first bond pad and a second bond pad, where the connection between the first bond pad and the second bond pad includes a center tap located proximate to a voltage null point. The head slider also includes at least one read element for reading data from the magnetic recording disk, the read element electrically connected between the center tap and a third bond pad, where the write element and the read element are configured to be selectively activated based on biased inputs to the first bond pad, the second bond pad, and the third bond pad.

    RECORDING HEAD GIMBAL ASSEMBLY PROGRAMMING BY SELECTIVE APPLICATION OF INTERCONNECTS

    公开(公告)号:US20190147908A1

    公开(公告)日:2019-05-16

    申请号:US15813391

    申请日:2017-11-15

    CPC classification number: G11B5/4853 G11B5/486 G11B5/6005 G11B19/02

    Abstract: A method for programming a head gimbal assembly. The method includes building a plurality of transducers into a slider, and testing the plurality of transducers to select one of the plurality of transducers for field operation. The method also includes providing an interconnect assembly having a plurality of traces with at least one of the plurality of traces having a plurality of electrically coupled bond pads. One of the plurality of bond pads is bonded electrically to the selected transducer out of the plurality of transducers, and the other bond pads of the plurality of bond pads are not electrically coupled to any of the plurality of transducers.

    Bolometer with temperature compensation for internal laser power monitoring in heat-assisted magnetic recording device

    公开(公告)号:US10127940B1

    公开(公告)日:2018-11-13

    申请号:US15342339

    申请日:2016-11-03

    Abstract: A slider configured for heat-assisted magnetic recording comprises an optical sensor coupled to first and second bond pads. The optical sensor comprises a bolometer and a reference sensor. The bolometer is situated at a location of the slider that receives at least some of the light and exposed to an ambient temperature at the slider. The bolometer produces a signal in response to a change in the ambient temperature and the change in output optical power. The reference sensor is situated at a location of the slider unexposed to the light and exposed to the ambient temperature. The reference sensor is coupled to the bolometer and configured to produce a signal in response to the change in the ambient temperature. The optical sensor is configured to generate a sensor signal indicative of changes in output optical power of a laser source without contribution due to ambient temperature changes.

    Bolometer and contact sensor arrangement for a heat-assisted magnetic recording device

    公开(公告)号:US09972350B1

    公开(公告)日:2018-05-15

    申请号:US15678409

    申请日:2017-08-16

    Abstract: A slider of a heat-assisted magnetic recording head comprises an air bearing surface and an optical waveguide configured to receive light from a laser source. The slider comprises a plurality of electrical bond pads including a first bond pad and a second bond pad. A first resistive sensor is configured to sense for spacing changes and contact between the slider and a magnetic recording medium at or near a first close point of the slider. A second resistive sensor is configured to sense for spacing changes and contact between the slider and the medium at or near a second close point of the slider. A bolometer is situated at a location within the slider that receives at least some of the light communicated along the optical waveguide. The first resistive sensor, the second resistive sensor, and the bolometer are coupled together and between the first and second bond pads.

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