About Axis Parallel To Or Coaxial With The Other Coil Axis Patents (Class 336/123)
  • Patent number: 10490342
    Abstract: A synchronous rectification module includes a transformer, a first conducting member and a synchronous rectification unit. The transformer includes plural secondary winding assemblies. The outlet ends of the secondary winding assemblies are protruded out from a first lateral region and a second lateral region of the transformer. The first conducting member is located at a third lateral region of the transformer. The synchronous rectification unit includes a first circuit board and a second circuit board. The first circuit board is connected with the first conducting member and located at the first lateral region. The second circuit board is connected with the first conducting member and located at the second lateral region. The outlet ends of the secondary winding assemblies are penetrated through corresponding first insertion holes of the first circuit board and corresponding second insertion holes of the second circuit board.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: November 26, 2019
    Assignee: DELTA ELECTRONICS (THAILAND) PUBLIC COMPANY LIMITED
    Inventors: Hao Lu, Tianding Hong, Tao Zhang, Bo Shen, Zhongwei Ke
  • Patent number: 10332677
    Abstract: A power reception device includes a first capacitor and a second capacitor, and first capacitor and second capacitor are arranged to be adjacent to each other on a same side when viewed from a power reception coil, such that a second external electrode faces a fourth external electrode, and first capacitor and second capacitor are arranged such that a distance between second external electrode and fourth external electrode is shorter than a distance between a first external electrode and a third external electrode.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: June 25, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Hiroaki Yuasa
  • Patent number: 9404728
    Abstract: A sensor for locating metal objects has coils or coil parts which form at least one transmitting coil (5.1) and at least one receiving coil (7.1) which are inductively coupled to one another and are arranged such that said coils partially overlap for the purpose of interaction decoupling, wherein optimum cancellation of the interaction can be achieved. Sensor electronics are provided for energizing the transmitting coil and for evaluating a reception signal (10.6) from the receiving coil. As a result of the fact that the transmitting coil (5.1) and the receiving coil (7.1) substantially have an identical coil shape and are arranged such that said coils are rotated and/or offset with respect to one another, wherein a plurality of symmetrically arranged, overlapping regions (8.4) are formed, a sensor which provides a greater range and extended possibilities for installation in conventional industrial sensor housings is provided.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: August 2, 2016
    Inventor: Gerd Reime
  • Patent number: 9358684
    Abstract: A wireless transmission device for use in a robot arm is disclosed to include a rotating unit including a first winding and a second winding relatively rotatably arranged in a coaxial manner, and two receiver-transmitter units respectively electrically connected to the first winding and the first winding for receiving a composite signal and then generating a power signal and a control signal. Thus, the receiver-transmitter units can transmit power and data in two ways by means of an electromagnetic coupling between the first winding and the second winding, having the advantages of simple structure and no need for wiring, and allowing the robot arm using the wireless transmission device to be freely rotated through 360 degrees.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: June 7, 2016
    Assignee: MERRY ELECTRONICS CO., LTD.
    Inventors: Tong-Kun He, Wei-Chi Chang
  • Publication number: 20150115762
    Abstract: A rotary transformer for an electrical machine includes a rotary printed circuit board and a stator printed circuit board. The rotary printed circuit board is operatively connected to the stator printed circuit board for relative rotation with respect to the stator printed circuit board. A conductor is fixed to the one of the printed circuit boards and includes a spiral coil for transferring electrical energy between the rotary printed circuit board and stator printed circuit board.
    Type: Application
    Filed: February 19, 2014
    Publication date: April 30, 2015
    Applicant: ROSEMOUNT AEROSPACE INC.
    Inventors: Gregory I. Rozman, Jacek F. Gieras
  • Patent number: 8964410
    Abstract: A transformer has two magnetic cores, at least one primary winding unit mounted in the magnetic cores, at least one secondary winding unit mounted in the magnetic cores and two rectifying circuit boards externally mounted beside the magnetic cores. An AC voltage output from the secondary winding unit is transmitted to and rectified by the rectifying circuit board. Therefore, the size of the transformer is compact, and heat energy generated by electronic elements mounted on the rectifying circuit board is effectively dissipated to maintain normal operation of the transformer. Further, since the transmission path from the secondary winding unit to the rectifying circuit board is short, energy loss is reasonably reduced when the transformer is operated under a high frequency situation or a larger current mode.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: February 24, 2015
    Assignee: Acbel Polytech Inc.
    Inventors: Shun-Te Chang, Chien-Hua Wu, Chia-An Yeh, Hsiang-Yu Hung
  • Publication number: 20140145811
    Abstract: An improved transformer for use in a power tool, wherein the power tool includes a stationary body and a shaft which is movable relative to the body. The transformer includes a stator which is fixed relative to the body, and at least one stator winding. The transformer also includes a rotor which is movable with the shaft, and at least one rotor winding. A magnetic field is shared by the at least one stator and rotor windings, and is used for creating a contactless signal connection between the body and an at least one sensor of the shaft. The stator and the rotor are arranged in a mutual geometrical relationship such that the contactless signal connection is provided for different positions in both an axial direction and a rotational direction of the shaft.
    Type: Application
    Filed: June 14, 2012
    Publication date: May 29, 2014
    Applicant: ATLAS COPCO INDUSTRIAL TECHNIQUE AB
    Inventor: Carl-Gustaf Carlin
  • Publication number: 20110221555
    Abstract: An electrical assembly for use with a rotary transformer is provided. The electrical assembly includes a assembly structure having a first flange positioned proximate a first end portion of the assembly structure and a second flange positioned proximate a second end portion of the assembly structure. The electrical assembly further includes at least one lamella coupled to the assembly structure. The at least one lamella extends from the first flange to the second flange.
    Type: Application
    Filed: December 21, 2010
    Publication date: September 15, 2011
    Inventors: Alexander Felix Fiseni, Jan Hemmelmann
  • Patent number: 8013706
    Abstract: System for contactless energy transmission includes a primary side winding and a secondary side winding that is rotatable relative to the primary side winding, a coil core being provided on the primary side winding, whose sectional view in at least one sectional plane containing the axis of rotation is formed as a U shape or C shape around the winding region of the primary side winding.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: September 6, 2011
    Assignee: Sew—Eurodrive GmbH & Co. KG
    Inventors: Olaf Simon, Jochen Mahlein, Klaus Schwesinger, Leobald Podbielski, Jochen Weber, Bernhard Schneider
  • Patent number: 7859381
    Abstract: An autotransformer for use in low frequency, high power applications that uses a stack of printed wire boards constructed of a top, inner, and bottom layer including electrical trace windings circumventing the transformer core and formed in the inner layer for direct thermal contact with a heat sink interface providing a uniform and consistent heat path down to the heat sink plate. The autotransformer further includes a board to board connection employing solder cups to electrically connect between predetermined printed wire board traces. The printed wire board autotransformer also may use a non-planar interface for thermal interface with a non-planar heat sink plate surface.
    Type: Grant
    Filed: July 5, 2008
    Date of Patent: December 28, 2010
    Assignee: Honeywell International Inc.
    Inventors: Keming Chen, Mike Kirkland, Michael A. Quan
  • Patent number: 7750507
    Abstract: An electronics support apparatus for rotating electronics is provided that eliminates the need for electrical contact brushes and/or reduces the number of inductive power coupling coil pairs required to provide power to the rotating electronics. With the apparatus, a single inductive power coupling coil pair is utilized in which the coils are oriented at approximately 90 degrees, i.e. at a right angle, to each other, e.g., the “outer” coil (secondary transformer coil) is oriented approximately 90 degrees to the “inner” coil (primary transformer coil). A transformer core, or “elbow core,” having an approximately 90 degree bend is provided for coupling the magnetic energy of the primary transformer coil with the secondary transformer coil, thus imparting or coupling energy simultaneously through 2 axes of motion.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: July 6, 2010
    Assignee: International Business Machines Corporation
    Inventor: Randall R. Heisch
  • Patent number: 7701315
    Abstract: A device for contactless transfer of energy and data. One embodiment includes a primary coil assembly on a first support and a secondary coil assembly on a second support, the supports rotatable in relation to one another, the primary and secondary coil assemblies having an energy coil for inductive transfer of electric energy. To minimize interference in data transfer, the primary and secondary coil assemblies may include at least one data coil for inductive data transfer wherein at least one winding of the data coil surrounds at least one winding of the energy coil so that a first section of the data winding is wound in the wound direction of the energy coil and a second section of the data winding is wound in a direction opposite the wound direction of the energy coil.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: April 20, 2010
    Assignees: Siemens Aktiengesellschaft, Institut fur Automation und Kommunikation e.V.
    Inventors: Rudolf Mecke, Christian Rathge
  • Publication number: 20080088400
    Abstract: The invention relates to an inductive rotary joint having at least two component parts which each comprise a coil for introducing power and/or taking-up power. In order that the rotary joint may be able to withstand even high mechanical load, at least one of the component parts is made of a synthetic resin containing soft magnetic particles, and the coil of the one part is at least partially located in the synthetic resin.
    Type: Application
    Filed: May 3, 2006
    Publication date: April 17, 2008
    Applicant: Schleifring und Apparatebau GmbH
    Inventors: Nils Krumme, Herbert Weithmann, Harry Schilling, Georg Lohr
  • Patent number: 6831542
    Abstract: A micro-electro mechanical (MEM) switch capable of inductively coupling and decoupling electrical signals is described. The inductive MEM switch consists of a first plurality of coils on a movable platform and a second plurality of coils on a stationary platform or substrate, the coils on the movable platform being above or below those in the stationary substrate. Coupling and decoupling occurs by rotating or by laterally displacing the coils of the movable platform with respect to the coils on the stationary substrate. Diverse arrangements of coils respectively on the movable and stationary substrates allow for a multi-pole and multi-position switching configurations. The MEM switches described eliminate problems of stiction, arcing and welding of the switch contacts. The MEMS switches of the invention can be fabricated using standard CMOS techniques.
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: December 14, 2004
    Assignee: International Business Machines Corporation
    Inventors: Richard P. Volant, John E. Florkey, Robert A. Groves
  • Patent number: 6703734
    Abstract: A ring magnet is attached to an outer ring by a magnet holding unit. A coil hold unit attached with a generator coil is provided at an inner ring to face the ring magnet. A substrate with a transmission circuit and a loop antenna is attached to the coil hold unit. Rotation of the inner ring causes the generator coil to generate power. The generated power is applied to the transmission circuit. A sensor output or the like is transmitted by the transmission circuit as a weak wave via the loop antenna to be received at the stationary side.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: March 9, 2004
    Assignee: NTN Corporation
    Inventors: Hiroyuki Hakamata, Koichi Okada
  • Patent number: 6489874
    Abstract: A non-contact electric power transmission apparatus including a primary unit and a secondary unit. The primary unit includes a primary core and a power primary winding. A signal secondary winding is wound around the primary core and provided to be apart from the power primary winding to form a primary gap between the power primary winding and the signal secondary winding. The secondary unit includes a secondary core and a power secondary winding. A signal primary winding is wound around the secondary core and provided to be apart from the power secondary winding to form a secondary gap between the power secondary winding and the signal primary winding.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: December 3, 2002
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Yoshinori Katsura, Mikihiro Yamashita
  • Patent number: 6307440
    Abstract: In an oscillator circuit employing a pattern coil on a printed-wiring circuit board as a resonator circuit, in order to satisfactorily adjust dispersion in oscillation frequencies, an air-core coil wound by 0.5 turn and less than one turn is provided so as to be connected to the pattern coil in parallel and mounted on the printed-wiring circuit board. The oscillation frequency is adjusted by adjusting the angle of the air-core coil relative to the printed-wiring board.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: October 23, 2001
    Assignee: Sony Corporation
    Inventor: Masaru Shimanuki
  • Patent number: 5521444
    Abstract: A device for transferring electrical power from a stationary member to a rotatable member is provided by incorporating an air core transformer of which a first coil is rigidly attached to the stationary member and a second coil is rigidly attached to the rotatable member. A power converter is provided to convert input power from a first frequency to a second frequency. The first frequency can be that of a wall service within a family residence and the second frequency can be approximately 30 thousand hertz. The second frequency is provided to the electrical conductor of a first coil. The first and second coil of an air core transformer are used to transfer power across an air gap to the second coil. The transferred electrical power is then rectified to provide DC power to a plurality of electrical components that are rigidly attached to the rotatable member.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: May 28, 1996
    Assignee: Honeywell Inc.
    Inventor: Donald S. Foreman
  • Patent number: 5239288
    Abstract: A printed circuit resolver produces voltage outputs that vary according to sine and cosine functions with the angular position of a rotor winding. Each resolver winding is planar and comprises at least two planar multi-turn coils formed on a disk. Each coil comprises N turns and 2 M sectors, where N and M are numbers.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: August 24, 1993
    Assignee: Transicoil Inc.
    Inventor: Izrail Tsals
  • Patent number: 5001585
    Abstract: A rotational transformer for a rotational transducer in a tape recorder includes a stator piece having a first ring-shaped magnetic core and a stator winding associated therewith. A rotor piece includes a second ring-shaped magnetic core coaxially located with the first ring-shaped magnetic core, a rotor winding and a coil carrier formed of a nonmagnetic material. The carrier is inserted into a ring-shaped recess formed in the second core. The coil carrier is constructed with at least one slot into which wire of the rotor winding is emplaced. The slot is of a width adopted to the size of the wire of the rotor winding.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: March 19, 1991
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Adelbert Schalk
  • Patent number: 4829401
    Abstract: The transformer comprises a rotor core (1) in the form of a circular ferromagnetic disc which is rotatable about its axis (5), and a stator core (3) in the form of a circular, stationary ferromagnetic disc which is coaxial with the rotor core. The facing main surfaces of these discs are provided with grooves (11, 13) and ridges (15, 17) which are concentric with respect to the axis (5). In the grooves (11, 13) there are provided rotor windings (19) and stator windings (21), respectively. The stator windings (21) consist of conductor tracks on at least one main surface of a circular first portion (25) of a flexible, electrically insulating foil which is connected, via a strip-shaped intermediate portion (27) with connection conductor tracks (41), to a second circular foil portion (29) which supports further conductor tracks (37) and components (39) of an electronic circuit.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: May 9, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Roger A. Vranken
  • Patent number: 4777436
    Abstract: An inductance coil sensor in which a rotating spoiler (46) alters the inductance of a stationary coil (1230/1432) having two parts (12a, 12b; 30a, 30b/14a, 14b; 32a, 32b) disposed on opposite sides of the spoiler. Changes in inductance of the stationary coil are sensed to develop an indication of the rotary movement of the spoiler which, in turn, represents changes in the parameter being monitored. By locating one part of the stationary coil above the spoiler and one part below the spoiler, compensation is provided for undesired movements of the spoiler along its rotation axis.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: October 11, 1988
    Assignee: Sensor Technologies, Inc.
    Inventor: David Fiori, Jr.
  • Patent number: 4754180
    Abstract: A transformer for coupling electrical power from a stationary location to a moving location with a minimum of disturbance forces between the stationary and moveable components. The transformer is particularly adapted to coupling power to a magnetically suspended platform. The transformer includes an enclosed core housing two windings, a stationary primary coil, and a secondary coil free to move linearly and angularly over a limited displacement, where the secondary coil is affixed to the moveable platform, thereby enabling energy to be extracted for powering apparatus mounted within the platform.
    Type: Grant
    Filed: October 7, 1986
    Date of Patent: June 28, 1988
    Assignee: Honeywell Inc.
    Inventor: James A. Kiedrowski
  • Patent number: 4700189
    Abstract: A linear synchro/resolver comprised of an opposed pair of stator assemblies, each of which has a plurality of corresponding, opposed, toothed pole piece pairs, a toothed slider movably mounted between the opposed sets of pole piece pairs, and wherein the pole piece pairs on each stator assembly are spaced apart along the assembly's length by a non-integral multiple of the pitch of the stator teeth. Separate coils are wound on the stator pole pieces, with the coils of adjacent and opposed pairs of coils being connected together in phases. The inductance of the coils is thus a function of the alignment of the slide teeth with the stator pole piece teeth. A source of alternating current is connected to the phases of coils, the current magnitude flowing through each phase of the coils is detected, and the current magnitude differences between the phases are amplified.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: October 13, 1987
    Assignee: Motornetics Corporation
    Inventor: Ross D. Welburn
  • Patent number: 4532447
    Abstract: The invention relates to a rotary electric machine able to be used as a speed variator and/or a torque converter. It comprises a stator with s pairs of poles, a central rotor (RM) with p pairs of poles and an intermediate rotor (RT) comprising, at its inner face, at least one primary electric circuit subjected to the field of the central rotor (RM) and, at its outer face, at least one secondary electric circuit subjected to the stator field. A switching circuit controls the passage, through the secondary circuit, of the current produced in the primary circuit, in a direction such that the torque exerted by the stator (F) on the rotor (RT) is in the same direction.
    Type: Grant
    Filed: July 21, 1983
    Date of Patent: July 30, 1985
    Inventor: Pierre Cibie
  • Patent number: 4500832
    Abstract: A coaxially aligned transformer having a secondary coil wrapped with a high dielectric insulating material wrapped on a support member and slidably supported between a lock block and a support base to permit the transformer electrical parameters to be adjusted by sliding the transformer core. A primary coil is supported coaxially about the secondary coil. Both the primary and the secondary coil include voltage divider segments having equal inductance with the primary coil segments arranged in phase and the secondary coil segments arranged 180.degree. out of phase. The secondary coil is completely insulated and isolated from ground. The primary coil has a number of taps which are connected to the contacts of a multi-position switch so that the voltage in one of the segments of the primary coil may be varied so that the output of the transformer may be varied. This transformer provides a switchable primary circuit and a fully insulated secondary circuit.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: February 19, 1985
    Assignee: Codman & Shurtleff, Inc.
    Inventor: Stanley Mickiewicz
  • Patent number: 4497004
    Abstract: A picture reproducing apparatus for a helical scanning video tape recorder including an impedance transformer; a video head connected to the input of the impedance transformer; a resonance circuit connected to the output of the impedance transformer; a pre-amplifier connected to the output of the resonance circuit; a feedback resistor connected between the junction of the pre-amplifier and resonance circuit and the output of the pre-amplifier; and an output terminal connected to the output of the pre-amplifier. The impedance transformer has the output impedance four times as high as the input impedance thereof.
    Type: Grant
    Filed: June 2, 1982
    Date of Patent: January 29, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Akira Shibata, Makoto Konosu, Teizo Tamura, Koichi Hirose, Kuniaki Miura, Noboru Kojima, Keiichi Komatsu
  • Patent number: 4471337
    Abstract: Conductor bundles for the concentric coils of a dry inductor having no iron core. The coils define cooling air gaps therebetween, adjacent ones of the coils being electrically connected in parallel and each coil being comprised of turns of a conductor bundle of the same rectangular cross section, the coils having different numbers of said turns. The conductor bundles form the turns of the coils and comprise a plurality of conductors electrically insulated from each other and twisted together, the conductor bundles of all coils are structurally identical with respect to the number and cross-sectional dimension of the conductors, and the rectangular cross sections of the conductor bundles forming respective coils have different cross-sectional dimensions in the axial direction of the respective coil whereby the coils have the same dimension in said axial direction while the number of the turns of the coils differs.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: September 11, 1984
    Assignee: Spezielektra Esslinger K.G.
    Inventors: Johann Mausz, Alfred Wittenhofer
  • Patent number: 4463333
    Abstract: A position-measuring transformer having a pair of confronting relatively movable supports (12, 14) upon the confronting faces (16, 18) of which lie patterns of conductors is disclosed (26, 50). The conductors (26, 50) on the respective supports (12, 14) are dimensioned, configured, and positioned in such a way that portions of the conductors of one support confront portions of the conductors of the other support. When the conductors of one support are energized, a coupling effect is produced in the conductors of the other support. This coupling effect varies as a function of the relative position of the conductors, i.e., the relative position of the support. The energized conductors comprise a pattern of strip-like conductors (30, 88, 116) placed side by side. The conductors in which the coupling effect is produced are of two configurations. The "fine data" pattern comprises strip-like conductors (116) placed side by side in a pattern similar to that of the energized conductors (30).
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: July 31, 1984
    Assignee: Farrand Industries, Inc.
    Inventor: Frank S. Ruhle
  • Patent number: 4430632
    Abstract: A coupling mechanism is disclosed for coaxially connecting a pair of connectable components, such as a pair of transducer assemblies each having a stator. A coupling ring is carried by one stator and engageable with the other for drawing the stators together axially in response to relative rotation of the coupling ring. First friction mechanism between the stators prevent relative rotation between the stators after the stators are aligned angularly to align the electrical zeros thereof. Second friction mechanism of lesser coefficient of friction between the coupling ring and the one stator permit relative rotation therebetween whereby the stators can be finally coupled by further rotation of the coupling member while the first friction means maintains the stators in zero electrical alignment. Subsequently, locking washers are fastened between the coupling ring and stators to permanently lock the stators in relative aligned position.
    Type: Grant
    Filed: May 26, 1982
    Date of Patent: February 7, 1984
    Assignee: MPC Products Corporation
    Inventor: Richard K. Carlson
  • Patent number: 4404559
    Abstract: A rotative coupling allows the inductive transmission of power and the transmission of informational signals between a stationary part and a hollow, rotating part. The informational signals are transmitted on a modulated beam of light passing through and along the axis of rotation of the hollow, rotative part. The power is transmitted by induction from a coil on the stationary part to a coil on the rotative part, both coils being positioned within stationary core means and the rotative core means, which combine to establish a continuous flux path around the coils.
    Type: Grant
    Filed: May 26, 1981
    Date of Patent: September 13, 1983
    Assignee: Battelle Memorial Institute
    Inventor: G. Frederick Renner
  • Patent number: 4223313
    Abstract: In a robot, the transmission of electrical power and signals is effected without contact at a joint position, either by using a magnetic coupling provided by means of a transformer formed by windings housed in ferrite cores, or by capacitive coupling obtained by means of two capacitors formed by annular surfaces facing each other, the two cores or the two plates being at a predetermined spacing so that one part of the robot is able to turn by more than 360.degree. around an axis relative to another part without any limit on rotation.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: September 16, 1980
    Assignee: Regie Nationale des Usines Renault
    Inventor: Jean Chabrol
  • Patent number: 4183001
    Abstract: One of two coils of approximately the same diameter, forming the primary and secondary coils of a transformer for tube welding or other induction heating equipment, is mounted for movement relative to the other, preferably about a pivotal axis parallel to the axes of the coils, to enable its axis to be shifted towards and away from the axis of the other coil and the coils are so arranged that loops or turns of each coil, which are connected together in series or parallel, can pass between the loops or turns of the other coil to facilitate changing the coupling factor and thus adjusting the power delivered to the heating coil.
    Type: Grant
    Filed: December 22, 1978
    Date of Patent: January 8, 1980
    Assignee: Electroheating (London) Limited
    Inventors: David S. Brooks, Trevor C. Savage
  • Patent number: 4138253
    Abstract: A method for making an improved member of a position measuring transducer is disclosed, wherein the member has a pattern of uniformly pitched bars thereon. The method comprises the steps of superimposing a plurality of positionally shifted latent images of an initial pattern of bars having approximately uniform pitch upon a photo-sensitive material, and then processing the photo-sensitive material to produce a production pattern of bars having a significantly more uniform pitch than the initial pattern. The production pattern is used to produce an improved member of a position measuring transducer having a correspondingly greater accuracy than a transducer incorporating a member made directly from the initial pattern. A procedure for selection of the processing parameters to control the uniformity of spacing between bars and to adjust the width and relative position of the "gray" transition region at the bar edges is also taught. Finally, the production of improved scale members of INDUSTOSYN.RTM.
    Type: Grant
    Filed: January 20, 1978
    Date of Patent: February 6, 1979
    Assignee: Farrand Industries, Inc.
    Inventor: Clair L. Farrand