Abstract: A “coil-on-a-chip” RFID tag having an rfid integrated circuit and an antenna contemporaneously formed on a substrate. The antenna is a helical multiple layer, multi-turn coil having an axis of revolution oriented at an angle, preferably ninety degrees, with respect to the major body plane of the rfid integrated circuit. The coil has a central opening with an annular core of magnetically permeable material. The RFID tag has an increased operating range over known ID tags.

Abstract: An RFID tag having an rfid integrated circuit and an antenna is combined with a first passive antenna circuit to provide an extended operating range. The first passive antenna circuit has a first coil and a first capacitor to tune the passive antenna circuit to a resonant frequency the same as the operating frequency of the RFID tag. The first coil has a central opening larger than the size of the antenna. The passive antenna circuit is arranged with the antenna located in the central opening of the coil, preferably in a co-planar manner, to promote inductive interaction therebetween. A second passive antenna circuit essentially identical to the first, but having larger dimensions, is positioned with the coil of the second passive antenna circuit surrounding the first coil to extend the operating range even further.

Abstract: A “coil-on-a-chip” RFID tag having an rfid integrated circuit and an antenna contemporaneously formed on a substrate. The antenna is a helical multiple layer, multi-turn coil having an axis of revolution oriented at an acute angle, preferably ninety degrees, with respect to the major body plane of the rfid integrated circuit. The coil has a central opening with an annular core of magnetically permeable material. The RFID tag has an increased operating range over known ID tags.

Abstract: An RFID tag having an rfid integrated circuit and an antenna is combined with a first passive antenna circuit to provide an extended operating range. The first passive antenna circuit has a first coil and a first capacitor to tune the passive antenna circuit to a resonant frequency the same as the operating frequency of the RFID tag. The first coil has a central opening larger than the size of the antenna. The passive antenna circuit is arranged with the antenna located in the central opening of the coil, preferably in a co-planar manner, to promote inductive interaction therebetween. A second passive antenna circuit essentially identical to the first, but having larger dimensions, is positioned with the coil of the second passive antenna circuit surrounding the first coil to extend the operating range even further.

Abstract: A collective objects management system for objects such as documents contained in file folders in drawers of file cabinets. Each file folder has an electrical circuit with a visible indicator mounted on the file folder. Each folder circuit has a crystal which is responsive to an R.F. signal of a specific frequency, the frequency being different for each folder circuit. An associated computer operates an R.F. signal generator to produce an R.F. signal at the frequency of the particular folder circuit of the file folder selected for retrieval. To aid the user, each file drawer has a visible indicator mounted on the front panel, the panel indicator being illuminated when the sought folder is contained in that drawer.

Abstract: A smart card for use in conjunction with a security portal, such as a transit turnstile, a residential access gate, or a parking facility, for performing authentication checks for authorized passage. A print sensor is positioned on each major surface of the card in positions conforming to the natural placement of the thumb and a finger. The print sensors generate print pattern signals which are checked against authentic versions stored in non-volatile memory in the card, using a processor located within the card. The result of the authentication check is communicated to the associated external security portal by an r.f. circuit, which also receives r.f. energy from the external device to provide D.C. power for the circuits internal to the card. The card can be used on-the-fly without the need to stop at the check point, thereby facilitating traffic flow through the check point.

Abstract: An organizer management system for facilitating the location of an item stored in one of several drawers in one or more drawer organizer cabinets. Each drawer has an LED mounted on a front panel and a circuit having a crystal with a specific resonant frequency. The resonant frequency of the crystal in a given drawer is different from all other crystals in the system. All drawer circuits are coupled in parallel to a computer-controlled r.f. signal generator. To locate a particular item, the user enters a description of the item into a system computer, which contains a list of items in the system and the corresponding frequency for each item. The computer then operates the r.f. generator to generate an r.f. signal of the correct frequency for the specified item. The LED on only the drawer containing that item is activated, so that the user can visually locate the correct drawer.

Abstract: A collective objects management system for objects such as documents contained in file folders in drawers of file cabinets. Each file folder has an electrical circuit with a visible indicator mounted on the file folder. Each folder circuit has a crystal which is responsive to an R.F. signal of a specific frequency, the frequency being different for each folder circuit. An associated computer operates an R.F. signal generator to produce an R.F. signal at the frequency of the particular folder circuit of the file folder selected for retrieval. To aid the user, each file drawer has a visible indicator mounted on the front panel, the panel indicator being illuminated when the sought folder is contained in that drawer. The R.F. signal generator can be operated in a sweep mode for checking the integrity of the file. The invention can be applied to a wide variety of collective objects management systems, such as supermarkets, automobile parts distributors, and various manufacturing operations.

Abstract: A thin film transformer with improved magnetic properties has a bottom pole member supported over a substrate, a top pole member and an intermediate multi-turn thin film coil. The top and bottom pole members form a closed magnetic path, and the coil surrounds one of the legs of the magnetic path. The top pole member, the bottom pole member or both are formed as a plurality of individual laterally spaced pole elements each forming a closed magnetic path with the other pole member. The lateral spacing of the pole elements substantially reduces eddy current build-up in the magnetic path.The bottom pole member in the region of the leg encircled by the coil has a plurality of spaced support members and the top pole element is formed over the support members to provide additional magnetic material at the join site.

Abstract: A miniature signal booster element is inserted into the conductive path along a pair of wires leading between the slider end of a flexure member in a disk drive and the mounting end of the flexure. The signal booster element comprises an integrated circuit amplifier or a ferrite core transformer. The ferrite core transformer may comprise two separate coils: one coupled to the transducer and the other coupled to the output side of the wire pair; or a single coil with an intermediate tap connection. The signal booster element is single coil with an intermediate tap connection. The signal booster element is encapsulated within an electrically insulative sheath to provide electrical insulation and mechanical isolation of the signal booster element from the flexure member.

Abstract: A thin film magnetic core array has a large number of individual thin film core memory elements arranged on a substrate with X, Y, Z and SENSE conductor leads reeving through the core elements between contact pads arranged about the periphery of the array. Each thin film magnetic memory element includes a bottom pole, a top pole forming a closed magnetic path with the top pole, the structure surrounding the leads passing through the core, and insulation material for electrically insulating the leads from each other and from the pole pieces. The SENSE lead from the array is coupled to a miniature thin film transformer which amplifies the signals read from the individual core elements. The transformer has a bottom pole, a top pole forming a closed magnetic path with the bottom pole, including a central leg extending between the top and bottom poles, and a pair of electrically conductive coils mutually spaced in the region between the top and bottom poles.

Abstract: A thin film transducer/transformer assembly includes a thin film magnetic transducer assembly formed at a first location on a support surface of a substrate and a thin film transformer assembly formed at a second location of the support surface of the substrate. The transducer assembly and the transformer assembly are each provided with electrically conductive coils which are mutually coupled by electrically conductive paths extending therebetween.The transducer assembly includes a bottom pole member, a top pole member and an electrically conductive coil partially located between the top and bottom pole members. The pole members are mutually coupled at the back gap regions thereof and have pole ends which are mutually spaced and insulated.

Abstract: A thin film magnetic head is disclosed which includes a substrate, a first layer of magnetic material having a first offset portion, a second layer of magnetic material having a second offset portion overlying the first offset portion, and a layer of conductor material disposed within the cavity defined by the two offset portions. In one embodiment the offset portion of the first magnetic layer is disposed within a recess in the substrate. In a second embodiment the offset portion of the first magnetic layer is disposed between two insulation layers mounted along the top surface of the substrate.

Abstract: Optically or visually perceptible lapping and grinding patterns are provided in a thin film transducer structure by depositing conductive material both between the magnetic pole pieces and, external to such pole pieces. The conductive material between the pole pieces is so positioned as to determine the zero throat point of the transducer and is in predetermined aligned relationship with the external pattern by, for example, being formed during a single masking step.

Abstract: A method for formation of thin film inductive magnetic transducers wherein a minimum number of basic photomasks are utilized for deposition of successive thin film winding layers, and wherein all odd-to-even inter-film electrical contact points are disposed in a first transverse alignment through the transducer, and all even-to-odd inter-film contacts are aligned in a second transverse alignment through the transducer that is closely adjacent the first transverse alignment.

Abstract: A magnetic read/write transducer head of the type utilizing thin film materials. The method of manufacture comprises steps which deposit a thin film magnetic recording head on a selected substrate having dimensions which enable batch manufacture of a thin film magnetic transducer in combination with its supporting slider assembly. The substrate of selected material in large wafer form is subjected to a series of thin film deposition, etching and plating operations to form a plurality of thin film magnetic heads thereon. Thereafter, the substrate wafer is diced around each thin film magnetic transducer head with subsequent finishing and polishing to requisite shape thereby to yield the complete integrated slider and transducer head assembly.

Abstract: A thin film magnetic head is disclosed which includes a substrate, a first layer of magnetic material having a first offset portion, a second layer of magnetic material having a second offset portion overlying the first offset portion, and a layer of conductor material disposed within the cavity defined by the two offset portions. In one embodiment the offset portion of the first magnetic layer is disposed within a recess in the substrate. In a second embodiment the offset portion of the first magnetic layer is disposed between two insulation layers mounted along the top surface of the substrate.

Abstract: A method for formation of thin film inductive magnetic transducers wherein a minimum number of basic photomasks are utilized for deposition of successive thin film winding layers, and wherein all odd-to-even inter-film electrical contact points are disposed in a first transverse alignment through the transducer, and all even-to-odd inter-film contacts are aligned in a second transverse alignment through the transducer that is closely adjacent the first transverse alignment.

Abstract: A method of manufacture for forming a novel magnetic read/write transducer head of the type utilizing thin film materials. The method of manufacture comprises steps which deposit a thin film magnetic recording head on a selected substrate having dimensions which enable batch manufacture of a thin film magnetic transducer in combination with its supporting slider assembly. The substrate of selected material in thick wafer form is subjected to a series of thin film deposition, etching and plating operations to form a plurality of thin film magnetic heads thereon. Thereafter, the substrate wafer is diced around each thin magnetic transducer head with subsequent finishing and polishing to requisite shape thereby to yield the complete slider and transducer head assembly.