Magnetic read-record head with housing locator structure

Claim 2

An electromagnetic read-record head having a read-record surface and comprising: a plurality of electromagnetic transducers, each comprising a transducer core having a transducing end with a first pole face and a first read-record surface portion, having a middle segment with a coil would thereabout, and having another end with a positioning notch therein; a transducer frame having a support section to support the transducing end of each transducer, the support section having a second read-record surface portion, and the transducer frame also having a cylindrical support bar with annular slots and spaced apart from and parallel to the support section for supporting and positioning each transducer core other end by engaging each transducer positioning notch, thereby providing mutual alignment of the transducer first pole faces; shielding means comprising a magnetic shield between each two transducers for magnetically shielding each transducer from others of the transducers each shield having a notch for engaging one of the annular slots in the support bar; return means for providing a separate magnetic flux path for flux in each transducer core comprising a plurality of return cores, each having a second pole face at one end, and positioned in substantial alignment with the transducers, with each first pole face facing one second pole face and spaced apart therefrom forming a transducing gap between each transducer core and return core at the read-record surface; and holding and positioning means for holding and positioning the return cores in corresponding alignment with the transducer cores comprising a return frame having a substantially flat read-record surface portion with a lengthwise edge, and having a face formed at substantially a right angle to the flat readrecord surface portion, the face extending along the lengthwise edge and holding the return cores therein.

Claim 3

An electromagnetic read-record head as in claim 1 wherein: the return frame and return cores have a groove through a portion thereof substantially parallel to the read-record surface for defining the length of the second pole faces from the read-record surface, thereby defining the gap depth; and the return frame has a protrusion therefrom which has a reference surface parallel to the groove and is spaced from the groove a predetermined distance to facilitate measurement of the depth of the transducing gaps.

Claim 4

An electromagnetic read-record head having a read-record surface and comprising: a plurality of electromagnetic transducers, each comprising a transducer core having a transducing end with a first pole face with a first edge which is aligned with each other first pole face first edge at the read-record surface, having a second edge spaced away from the read-record surface, and having a first pole face dimension measured from the first edge to the second edge; holding means for holding the transducers in alignment; a plurality of return cores having an end with a read-record surface portion and providing a separate magnetic flux path for magnetic flux in each transducer; a return core frame having a substantially flat read-record surface portion, the frame holding the return cores in alignment so that the return core read-record surface portions are flush with said frame read-record surface portion, the return core frame and return cores in combination having a groove formed in a portion thereof with the groove having an edge parallel to the read-record surface portion for forming a plUrality of relatively uniform and aligned second pole faces having a second pole face dimension measured from an edge of each return core read-record surface portion to the groove edge, the second pole face dimension being smaller than the first pole face dimension, the return core frame being connected to the holding means with each first pole face first edge aligned with the return core read-record surface edge and with each first pole face facing a corresponding second pole face in a spaced-apart relationship forming a plurality of transducing gaps, each gap having relatively uniform depth established by and equal to the second pole face dimension, thereby providing relatively uniform output voltage from each transducer in the read-record head, the return core frame also having a reference surface thereon, parallel to the groove and located a predetermined distance from the groove to facilitate measurement of the depth of the transducing gaps; and shielding means for magnetically shielding each transducer and return core combination from others of the transducer and return core combinations.

Claim 5

An electromagnetic read-record head having a read-record surface and comprising: a plurality of electromagnetic transducers, each comprising a transducer core having a transducing end with a first pole face with a first edge which is aligned with each other first pole face first edge at the read-record surface, having a second edge spaced away from the read-record surface, and having a first pole face dimension measured from the first edge to the second edge; holding means for holding the transducers in alignment; a plurality of return cores having an end with a read-record surface portion and providing a separate magnetic flux path for magnetic flux in each transducer; a return core frame having a substantially flat read-record surface portion, the frame holding the return cores in alignment so that the return core read-record surface portions are flush with said frame read-record surface portion, the return core frame and return cores in combination having a groove formed in a portion thereof with the groove having an edge parallel to the read-record surface portion for forming a plUrality of relatively uniform and aligned second pole faces having a second pole face dimension measured from an edge of each return core read-record surface portion to the groove edge, the second pole face dimension being smaller than the first pole face dimension, the return core frame being connected to the holding means with each first pole face first edge aligned with the return core read-record surface edge and with each first pole face facing a corresponding second pole face in a spaced-apart relationship forming a plurality of transducing gaps, each gap having relatively uniform depth established by and equal to the second pole face dimension, thereby providing relatively uniform output voltage from each transducer in the read-record head, the return core frame also having a reference surface thereon, parallel to the groove and located a predetermined distance from the groove to facilitate measurement of the depth of the transducing gaps; and shielding means for magnetically shielding each transducer and return core combination from others of the transducer and return core combinations.

Claim 6

An electromagnetic read-record head as in claim 3 wherein: each transducer core has an other end with a positioning notch therein; the holding means comprises a transducer frame having a straight support section to support the transducing end of each transducer, and having a support bar spaced apart from and parallel to the support section supporting and positioning the transducer core other end by engaging the positioning notch; and the reference surface is on a lateral protrusion from the return frame.