Patent application number | Description | Published |
20090057406 | REFLECTION TYPE ENCODER - A reflection type encoder includes a reflection scale | 03-05-2009 |
20090316155 | Reflection Type Encoder, Scale Thereof and Method for Producing Scale - A reflection type encoder, which receives a plurality of light-receiving signals from a single scale, includes a light source, a scale having a plurality of patterns formed thereon to which light is irradiated from the light source, and a light-receiving element for receiving light reflected from each of the plurality of patterns, wherein a plurality of patterns each having different thicknesses are formed on a single track of the scale by using a dielectric substance, light of a plurality of wavelengths each having different brightnesses in accordance with differences in the thickness of the dielectric substance is irradiated from the light source, and a light-receiving signal is obtained for the respective thicknesses of the dielectric substance. Therefore, the scale can be downsized by overlapping a plurality of patterns on the same track. | 12-24-2009 |
20110031383 | LENS ABERRATION CORRECTION IN A DOUBLY TELECENTRIC DISPLACEMENT SENSOR - A method and apparatus for suppressing loss of scale image contrast due to interference effects from optical path length differences, including lens profile aberrations, are provided in a displacement sensing optical encoder that uses a telecentric imaging configuration. According to the invention, the encoder is configured such that the image light that reaches the detector comprises symmetric ray bundles concentrated symmetrically on opposite sides of the optical axis center at the limiting aperture of the telecentric imaging configuration. Central ray bundles, and/or other ray bundles that have an optical path lengths significantly different than the operational symmetric ray bundles are prevented or blocked. As a result destructive interference is prevented and image contrast is improved. | 02-10-2011 |
20110233390 | OPTICAL ENCODER - A miniaturized optical encoder capable of obtaining a sufficient amount of light in the light receiving element is provided. An optical encoder | 09-29-2011 |
20110233391 | OPTICAL ENCODER - A miniaturized optical encoder capable of obtaining a sufficient amount of light in the light receiving element is provided. An optical encoder | 09-29-2011 |
20120085896 | ORIGIN LOCATION DETECTION CIRCUIT - An origin location detection circuit in an encoder. The encoder includes a scale on which an origin pattern indicating an origin is provided and a detection head relatively displaceable with respect to the scale. The origin location detection circuit includes a comparator for generating an origin signal indicating a location of the origin from an output voltage signal, which is output from a detector of the detection head and has been affected by involvement of the origin pattern; a DC voltage detection circuit smoothing the output voltage signal; and a differential amplifier circuit performing differential amplification of the output voltage signal and a DC voltage signal output from the DC voltage detection circuit. A differential amplifier signal of the differential amplifier circuit is input to the comparator. | 04-12-2012 |
20130181353 | SEMICONDUCTOR PACKAGE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor package includes a semiconductor device and a substrate, the semiconductor device including a straight line portion on an outer periphery and the substrate supporting the semiconductor device. A foil positioning pattern is formed on a front surface of the substrate, the positioning pattern touching the straight line portion of the semiconductor device to regulate a position of the semiconductor device. | 07-18-2013 |