Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 8173951 | Optical encoder comprising a main and reference light receiving portions with a three-phase signal generation for detecting displacement and direction of displacement of an incremental grating track In an optical encoder for measuring relative displacement, a scale 10 has a reference mark 14 composed of a reflection slit formed on at least one point of an incremental track 12, a detection portion (20) has a light irradiation portion ... | 05/08/2012 |
| 8044340 | Encoder and light receiving device for encoder An encoder is provided in which the absolute angle can be detected with high accuracy even when the irradiated position of light to be detected with respect to a scale is displaced from a reference, and a photodetecting device for an encoder used for such an encoder... | 10/25/2011 |
| 8017904 | Rotary encoder in which an absolute position is defined using reference mark signals produced by each of at least two readheads and method of operating the same Rotary encoder apparatus is described that comprises an encoder scale or ring and an encoder scale reader. The encoder scale includes an incremental scale and one or more reference marks. The encoder scale reader comprises at least a first readhead and a second read... | 09/13/2011 |
| 7875844 | Absolute-type encoder and method for detecting absolute position An absolute-type encoder includes an absolute-type encoder wheel. The absolute-type encoder wheel includes a primary optical grating unit and two secondary optical grating units, wherein the two secondary optical grating units are arranged outside and inside the pri... | 01/25/2011 |
| 7550711 | Encoder for a printer motor and a printer using the same A light emitter is operable to emit light. A scale comprises a transparent main body and a plurality of marks. The transparent main body has a first face and the second face which is opposite to the first face. The plurality of marks is provided on at least one of t... | 06/23/2009 |
| 7399956 | Optical encoder with sinusoidal photodetector output signal An optical encoder includes an optical encoder pattern of alternating light elements and dark elements, and an optical unit, including an optical emitter providing light to the encoder pattern, and an optical sensor including a photo-detector receiving the light fro... | 07/15/2008 |
| 7400269 | Coding element with integrated limit switch An optical encoder. The optical encoder includes a coding element, an emitter, and a detector. The coding element has a track with a track pattern. The track pattern includes a plurality of optically distinguishable sections. The plurality of optically distinguishab... | 07/15/2008 |
| 7394062 | Displacement-measuring optical scale and optical encoder using same When a convex lens 13 comes close to 0-th order transmitted light T0 with rotation of an optical scale 11, the 0-th order transmitted light T0 derived from a light beam L emitted from a light source 15 and transmitted through a dif... | 07/01/2008 |
| 7391010 | Photoelectric encoder and electronic equipment with increased resolution The photoelectric encoder of the present invention has a light-emitting device and light-receiving devices arranged in one direction in a region that light from the light-emitting device can reach. When a moving object that alternately has a light-on portion that pr... | 06/24/2008 |
| 7391011 | Optical encoder capable of detecting absolute position In two phases signals (A, B) outputted from a scale or a scale having a discontinuous portion provided in its incidental member to a light receiving portion, a region in which amplitudes of the two phases signals (A, B) are small corresponds to outputs when a reflec... | 06/24/2008 |
| 7382295 | Control unit for electric power steering apparatus Since an abnormality is judged by executing a square calculating process with respect to sin θ and cos θ for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which c... | 06/03/2008 |
| 7366637 | Form measuring instrument A form measuring instrument comprising: a roughness sensor placed on the table, and for outputting measurement data that includes information on the cross-sectional shape; a relative movement mechanism for relatively moving the table and the roughness sensor such th... | 04/29/2008 |
| 7358865 | Optical encoder and apparatus using optical encoder An optical encoder includes a cylindrical reflective scale, a point light source for irradiating the reflective scale, and light-receiving elements for receiving the light beams reflected by the reflective scale. The pitch of the reflective scale is set to an approp... | 04/15/2008 |
| 7358481 | Reflective encoder with three-dimensional code carrier An encoder having a code pattern on a carrier and an emitter detector module is disclosed. The code pattern includes alternating reflective and opaque regions on a carrier that includes a planar surface. The emitter-detector module includes a light source that gener... | 04/15/2008 |
| 7359826 | Method and device for detection of oscillations by a position measuring system A method for detecting the angular change of a scanning device with respect to at least one scale of a position measuring system by detecting several angular positions of the scanning device in relation to the at least one scale by detecting position measurements of... | 04/15/2008 |
| 7352294 | Absolute position detector An absolute position detector for accurately reading a code recorded on an absolute track is provided. Output signals from sensors that read a code recorded on an absolute track are input into a binarization processor. A compensator provided within the binarization ... | 04/01/2008 |
| 7348543 | Optical encoder with hollow light guide for indicating the angular position of a rotary shaft An optical encoder assembly and a method for measuring a rotation angle in which optical beams are spread over the circumference of a rotating optical disk by means of optical guides (OG). In the preferred embodiment the rotating optical disk has a pair of concentri... | 03/25/2008 |
| 7348545 | System and method for optical encoding on two opposed surfaces of a pattern medium An optical encoder system is disclosed with a single pattern medium having a first coded pattern disposed on the first side, a second coded pattern disposed on the second side, a first optical encoder disposed toward the first side, and a second optical encoder disp... | 03/25/2008 |
| 7348544 | Optical encoder with discontinuous optical grating An optical encoder includes a light-emitting unit, a scale with a discontinuous part, and a plurality of light-receiving elements arranged in relationship to a pitch of the scale. In the optical encoder, a light beam from the light-emitting unit reflects off the sca... | 03/25/2008 |
| 7336367 | Light-receiving/emitting composite unit, method for manufacturing the same, and displacement detection device A displacement detection device having excellent stability with the lapse of time and suitable for reduction in size and weight includes: a light source for emitting light; polarizing light splitting unit for splitting the light emitted from the light source into tw... | 02/26/2008 |
| 7332709 | Photoelectric encoder A photoelectric encoder includes a light source of an illumination light beam. The encoder also includes a movable grating which has grating lines and which is displaceable in a direction intersecting the grating lines. An index grating serves as a reference for dis... | 02/19/2008 |
| 7332711 | Photoelectric encoder, scale therefor and method for manufacturing the same A main scale 10 has protrusive grating 12 of a thin film of e.g. Cr formed on a base member 11. The base member 11 and the Cr thin film constitute a reflecting face which is set to provide the sufficient quantity of received light on a li... | 02/19/2008 |
| 7330326 | Recordable disk rotational speed error correction circuit An error correction circuit for determining an error in rotational speed of a recordable disk of a disk drive includes a sinusoidal error calculation portion adapted to generate a true oscillation error signal, and a summation portion adapted to combine the true osc... | 02/12/2008 |
| 7326919 | Optical encoder A main scale of an optical displacement measuring apparatus has slits arranged on it at regular intervals, a part of which is a missing slit that does not allow light to pass through used for detecting the original point. An index scale has four sets of windows form... | 02/05/2008 |
| 7324212 | Optical encoder having slanted optical detector elements for harmonic suppression An optical encoder includes a source of a light beam, an optical grating that generates a spatial pattern of interference fringes, and an optical detector which includes generally elongated detector elements that sample the interference fringe pattern at spatially s... | 01/29/2008 |
| 7315584 | Coherent receiver A coherent receiver receives a set of signals which are spaced in phase, or phase and polarization, and a reference signal. The receiver processes the set of signals to determine which of the set of signals has a predetermined association (e.g. closest in phase) wit... | 01/01/2008 |
| 7312433 | Measuring device and method for detecting objects interrupting a beam of radiation The invention relates to a measuring device 5 of the type which detects the interruption of a beam of radiation (e.g. light 20) by an object (50 FIG. 1) in the beam. The device includes a light emitter 12 and a light dete... | 12/25/2007 |
| 7312436 | Optical position measuring system with a detector arrangement and measuring graduation to produce partial filtering of undesired harmonics An optical position measuring system that includes a measuring graduation and a scanning unit that is movable in relation to the measuring graduation in a measuring direction. The scanning unit includes a light source that generates light towards the measuring gradu... | 12/25/2007 |
| 7309855 | Reflective encoder with light shield and electronic device using such reflective encoder A reflection encoder is disclosed having a light emitting element in a light receiving element that are separated by a light shielding body that prevents unwanted light from entering the light receiving element. In variations of the invention, the light shielding bo... | 12/18/2007 |
| 7304295 | Method and system of detecting eccentricity and up/down movement of a code wheel of an optical encoder set A system and method of measuring a rotational motion of a code wheel measures a rotational movement of the code wheel including an error component due to a non-rotational movement of the code wheel; measures the non-rotational movement of the code wheel; and produce... | 12/04/2007 |
| 7301141 | Photoelectric encoder and electric device provided with the same A photoelectric encoder of the invention is furnished with a light-emitting element and a light-receiving element for sending and receiving light that are disposed in opposition to one another, and a support member for accommodating the light-emitting element and th... | 11/27/2007 |
| 7301142 | Optical encoder photodetector array with multiple resolutions A photodetector for an optical encoder has plural sets of segmented photodiodes, each set of which is made by two adjoining segmented photodiodes capable of coping with a scale slit having a reference resolution. Output lines of the two adjoining segmented photodiod... | 11/27/2007 |
| 7297935 | Position-measuring device A position-measuring device includes: a measuring graduation provided on a measuring standard device arranged around in ring-like fashion; a scanning unit for optically scanning the measuring graduation using electromagnetic radiation; a scanning plate with a scanni... | 11/20/2007 |
| 7291831 | Method and apparatus for automatic modulation of photo-emitter brightness in an optical encoder A code strip, an optical encoder using such a strip and a method thereof are described. The code strip includes a calibration area. Light transmitted from a light source through the calibration area on the code strip is converted into an electrical calibration signa... | 11/06/2007 |
| 7282699 | Optical encoder for improved detection of the absolute position of an origin point Two detection heads are arranged opposite to each other with respect to a scale. On the scale, there is provided a discontinuous portion formed in a reflecting portion to enable detection of original point position. The original point is determined by detecting the ... | 10/16/2007 |
| 7280049 | Encoder runout error correction circuit A novel encoder system adapted for use in print architecture at least includes: a codewheel coupled to a rotating print architecture element; a first encoder sensor mounted at a first position relative to the periphery of the codewheel, the first encoder adapted to ... | 10/09/2007 |
| 7279674 | Optical encoder module An optical encoder module is employed to detect light modulated by a moveable member (e.g., code wheel). The optical encoder includes an emitter having a light-emitting element, and a transparent medium encapsulating the light-emitting element. The transparent mediu... | 10/09/2007 |
| 7276687 | Optical encoder and electronic equipment using the same Given n move information signals and m slits 22 (n and m: positive integers), the number of photodiodes associated with the m slits 22 is set to n×ma (a: a positive integer). By doing so, all of the (n×ma) photodiodes 23 ... | 10/02/2007 |
| 7265337 | Sensing apparatus Motion sensing apparatus including at least one light sensitive electronic component, said component responsive to at least a first and second incident light level each level creating in said light sensitive component a first state and a second state, wherein the ap... | 09/04/2007 |
| 7265339 | Encoder interpolation apparatus An interpolating detector for generating a position signal indicating a change in the relative position of a code pattern that includes alternating light and dark stripes is disclosed. The interpolating detector includes a photodiode array, an interpolation function... | 09/04/2007 |
