Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 6720760 | Induced current position transducers having improved scale loop structures A scale loop formed by a loop trace of electrically conductive material is usable in an induced current position transducer. The scale loop is continuous and has a particular shape depending on the configuration of the induced current position transducer. The scale ... | 04/13/2004 |
| 6642711 | Digital inductive position sensor A differential pulse transformer having a drive coil (10a) and differential sense coils (10b) are disposed on a planar surface with a target (10e, 10f) movable over the sense coils to cause an imbalance in magnetic field when a large di/dt pulse is genera... | 11/04/2003 |
| 6628115 | Scale loops for electromagnetic induction-type absolute position transducer A electromagnetic induction-type absolute position transducer according to the present invention has a plurality of scale loops functioning as coils. The scale loop has first and second loop portions and a connecting pattern portion which connects the cor... | 09/30/2003 |
| 6611138 | Inductive measuring device for detecting relative position and/or movement An inductive length measuring system which, by scanning a scale with a graduation of periodically variable reluctance and a coil system in a linear arrangement, can detect information relating to the position and/or the movement of the coil system with re... | 08/26/2003 |
| 6573707 | Displacement detecting device power supply and data communication device A scale and a detecting head each include input/output connectors. Either of the input/output connectors is connected to receiving-side connector. By connecting the receiving-side connector to either of the scale and the detecting head, which is fixed in ... | 06/03/2003 |
| 6545461 | Electro magnetic induction position detector using metal foil to reduce temperature-based variations in position detection An electromagnetic induction position detector has a detection head and a scale which are placed so as to be opposed to each other with a predetermined gap in a relatively movable manner. The detection head has a driving coil which generates a primary var... | 04/08/2003 |
| 6541961 | Method and apparatus for reduced temperature dependent position detection The invention relates to a method for substantially temperature-independent detection of the position of a moving element (9) by way of an inductive position sensor (1), comprising a coil (5) and a core (4) movable within the coil, the position of said co... | 04/01/2003 |
| 6522128 | Position sensor having compact arrangement of coils A transducer is provided for use in a position sensor which senses the position of two relatively movable members. In one form, the transducer has a plurality of sensor windings having a number of loops arranged in succession and connected in series so th... | 02/18/2003 |
| 6489760 | High sensitivity displacement measuring device using linear variable differential transformer The present invention is intended to provide a ultra-precision high sensitivity displacement measuring device which has such a high resolution as to be able to make submicron measurement. According to the invention, there is provided a displacement measuring ... | 12/03/2002 |
| 6400138 | Reduced offset high accuracy induced current absolute position transducer A reduced offset absolute position transducer has at least one magnetic field generator that generates a first changing magnetic flux in a first flux region. A plurality of coupling loops have a first plurality of coupling loop portions spaced at a first ... | 06/04/2002 |
| 6335618 | Position transducer having position-dependent amplitude encoding applying first and second modulations A high-accuracy inductive absolute position transducer system has two members movable relative to each other and includes an amplitude modulating transducer including flux modulators of progressively varying properties. The amplitude modulating transducer... | 01/01/2002 |
| 6329813 | Reduced offset high accuracy induced current absolute position transducer An inductive absolute position sensor has at least one magnetic field generator that generates a first changing magnetic flux in a first flux region. A plurality of coupling loops have a first plurality of coupling loop portions spaced at an interval rela... | 12/11/2001 |
| 6271661 | Absolute position transducer having a non-binary code-track-type scale An absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The code track is arranged to form a sequential pattern of base-N code words, where N i... | 08/07/2001 |
| 6259249 | Induction-type position measuring apparatus An inductive linear encoder (10) has a position sensor (1) and scale (2) which are movably disposed relative to each other. The sensor (1) is with a drive wire (3) to which an alternating current is supplied, and one set of detection wires (4a-4d) at righ... | 07/10/2001 |
| 6211667 | Electronic position transmission device adapted to transmit the position of stem of valves A device for measuring the displacement of stems of valves having a spindle coupled to a stem of a valve and provided with two inductive pickups; each inductive pickup is formed by a fixed part and a movable part constituting a variable inductor, which, f... | 04/03/2001 |
| 6191575 | Device for measuring linear displacements The proposed device comprises a primary detector and a measuring amplifier, the primary converter comprising a central cylindrical core and an external cylindrical core arranged coaxially along a longitudinal axis, a movable member being mounted coaxially... | 02/20/2001 |
| 6157188 | Compact, long-range absolute position transducer with an extensible compact encoding A compact, long-range inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The two members include a read head member and a scale mem... | 12/05/2000 |
| 6124708 | Position detection using a spaced apart array of magnetic field generators and plural sensing loop circuits offset from one another in the measurement direction A sensor head is provided for use in a apparatus for indicating the position of a movable member relative to a fixed member. It has two multi-turn sensor windings, each including repetitive pattern of series connected alternate sense loops of conductor. O... | 09/26/2000 |
| 6111402 | Position measuring instrument having a scanning element with multiple scanning tracks A scanning element for a position measuring instrument. The scanning element includes a first scanning track disposed within a first region and a second scanning track disposed adjacent to the first scanning track within a second region. An electromagneti... | 08/29/2000 |
| 6054851 | Induced current absolute position transducer method using a code-track-type scale and read head A high-accuracy inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and may include a fine track transducer. The code track transducers includes a code track transmitter winding... | 04/25/2000 |
| 6049204 | Electronic linear scale using a reduced offset high accuracy induced current position transducer An electronic linear scale having a reduced offset position transducer that uses at least one coupling loop on a scale to inductively couple a transmitter winding on a read head to one or more receiver windings on the read head. The transmitter winding ge... | 04/11/2000 |
| 6005387 | Reduced offset high accuracy induced current position transducer A reduced offset position transducer uses at least one coupling loop on a scale to inductively couple a transmitter winding on a read head to one or more receiver windings on the read head. The transmitter winding generates at least one primary magnetic f... | 12/21/1999 |
| 6002250 | Electronic linear scale using a self-contained, low-power inductive position transducer An electronic linear scale, which uses an induced current position transducer, includes a slider assembly mounted adjacent to an elongated beam. The slider assembly is mounted on one mounting member of a device such as a machine tool. The elongated beam i... | 12/14/1999 |
| 5998990 | Pitch-compensated induced current position transducer A pitch-compensated induced current position transducer includes a scale having a plurality of scale elements arranged along a measuring axis and a read head positioned adjacent to and movable relative to the scale. The read head has a transmitter winding... | 12/07/1999 |
| 5936399 | Inductive position transducer having a multi-tap receiver winding An induced current position transducer has a multi-tap winding. The multi-tap winding allows for digital interpolation of position to a small fraction of a wavelength, thereby reducing the amount of analog interpolation performed by the transducer electro... | 08/10/1999 |
| 5886519 | Multi-scale induced current absolute position transducer An inductive absolute position transducer system, usable in high accuracy applications such as linear encoders, has two members movable relative to each other and includes three inductive position transducers. Each inductive position transducer includes a... | 03/23/1999 |
| 5841274 | Induced current absolute position transducer using a code-track-type scale and read head A high-accuracy inductive absolute position transducer system has two members movable relative to each other and includes a code track transducer and may include a fine track transducer. The code track transducer includes a code track transmitter winding ... | 11/24/1998 |
| 5804963 | Inductive displacement sensor with a cursor and a movable coupling scale The inductive displacement sensor includes a first element of cursor (31) and a second element or scale (32) exhibiting spatially periodic electromagnetic characteristics, such as windows (321) and traverses (322). The first element (31) has a series of w... | 09/08/1998 |
| 5453685 | Inductive position sensing device and apparatus with selectable winding configuration A variable inductance device for indicating the position of one body relative to another includes primary and secondary windings which are mounted such that one is slidable over the other. The primary winding is wound on a body including annular channels ... | 09/26/1995 |
| 5438261 | Inductive sensing apparatus for a hydraulic cylinder In one aspect of the present invention, an apparatus for determining an extended length of a hydraulic cylinder is disclosed. A piston and rod are contained within a cylindrical housing of the hydraulic cylinder. A coil is wound about the rod and is attac... | 08/01/1995 |
| 5434504 | Position sensors for linear motors including plural symmetrical fluxes generated by a planar drive coil and received by planar sense coils being colinear along an axis of motion Position sensors for detecting the position of a linear motor relative to a platen are disclosed. In one embodiment, the sensor includes first and second magnetic members having teeth disposed relative to the teeth on the platen. A single turn planar driv... | 07/18/1995 |
| 5404101 | Rotary sensing device utilizing a rotating magnetic field within a hollow toroid core A rotary sensing device for indicating the angular displacement of a shaft is disclosed which comprises a magnetic core member formed of ferromagnetic material, a first winding wound within the core member for producing a first magnetic field in a closed ... | 04/04/1995 |
| 5300882 | Inductive position sensor for determining the angular position of a rotating shaft The sensor comprises a field coil generating a time-variant magnetic field, and sensor coils arranged inside the field coil, a rotatable device being arranged for modulating the magnetic flux passing through the sensor coil according to its angular positi... | 04/05/1994 |
| 5248938 | Inductance type rotational position sensor including a magnetic core having fixed and movable short rings A substantially C-shaped core which is used in a rotational position sensor of an inductance type. The core is formed of a sensing side portion and a referencing side portion, each of which has an arc shape. The centers of the arc shapes are spaced apart ... | 09/28/1993 |
| 5115193 | Inductive linear displacement transducer and temperature-compensating signal processor A transducer system is provided including an inductive linear displacement transducer connected to a temperature-compensating signal processor. The signal processor includes (a) an amplitude-variable, frequency-stable device providing a modulated D.C. cur... | 05/19/1992 |
| 5036275 | Inductive coupling position sensor method and apparatus having primary and secondary windings parallel to each other A position sensing device including two spaced conductive coils constituting a primary and secondary winding of a transformer. A coupling member is mounted to a moveable object such as an automobile steering mechanism and moves relative the primary and se... | 07/30/1991 |
| 5025213 | Device for determining a length of linear movement or an angle of rotation of a machine part A device for determining a length of linear movement of an angle of rotation of a machine part, and comprising spaced first and second bodies, a coil arranged on one of the first and second bodies, and a diaphragm connectable to a machine part for joint d... | 06/18/1991 |
| 5010298 | Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core A displacement measuring apparatus including a variable inductance coil formed of a pair of coils, on a core of predetermined length made of a material having high magnetic permeability. The pair of coils are disposed on a core adjacent to each other in t... | 04/23/1991 |
| 5003258 | Position transducer with temperature dependency compensation having a coil and displaceable core made of conductive and ferromagnetic materials The transducer comprises only a simple coil in which a core normally connected to a device the position of which is to be measured is displaced axially. The core comprises a rod of ferromagnetic material surrounded by a tube of good electrical conductivit... | 03/26/1991 |
| 4937523 | Method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures A method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures. The system is formed of a linear inductive displacement sensor provided with a primary coil and two identical symmetrica... | 06/26/1990 |
